^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2007 Oracle. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/bio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/fsnotify.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/backing-dev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/namei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/writeback.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/xattr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/uuid.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/btrfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/iversion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include "ctree.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include "disk-io.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include "export.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include "transaction.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include "btrfs_inode.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include "print-tree.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include "volumes.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include "locking.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include "inode-map.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include "backref.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include "rcu-string.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include "send.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include "dev-replace.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include "props.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include "sysfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #include "qgroup.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #include "tree-log.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #include "compression.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #include "space-info.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #include "delalloc-space.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #include "block-group.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #ifdef CONFIG_64BIT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * structures are incorrect, as the timespec structure from userspace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * is 4 bytes too small. We define these alternatives here to teach
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * the kernel about the 32-bit struct packing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct btrfs_ioctl_timespec_32 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) __u64 sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) __u32 nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) } __attribute__ ((__packed__));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) struct btrfs_ioctl_received_subvol_args_32 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) char uuid[BTRFS_UUID_SIZE]; /* in */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) __u64 stransid; /* in */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) __u64 rtransid; /* out */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct btrfs_ioctl_timespec_32 stime; /* in */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct btrfs_ioctl_timespec_32 rtime; /* out */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) __u64 flags; /* in */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) __u64 reserved[16]; /* in */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) } __attribute__ ((__packed__));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct btrfs_ioctl_received_subvol_args_32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct btrfs_ioctl_send_args_32 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) __s64 send_fd; /* in */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) __u64 clone_sources_count; /* in */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) compat_uptr_t clone_sources; /* in */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) __u64 parent_root; /* in */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) __u64 flags; /* in */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) __u64 reserved[4]; /* in */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) } __attribute__ ((__packed__));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) struct btrfs_ioctl_send_args_32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) /* Mask out flags that are inappropriate for the given type of inode. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (S_ISDIR(inode->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) else if (S_ISREG(inode->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return flags & ~FS_DIRSYNC_FL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * ioctl.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static unsigned int btrfs_inode_flags_to_fsflags(unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) unsigned int iflags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (flags & BTRFS_INODE_SYNC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) iflags |= FS_SYNC_FL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (flags & BTRFS_INODE_IMMUTABLE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) iflags |= FS_IMMUTABLE_FL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (flags & BTRFS_INODE_APPEND)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) iflags |= FS_APPEND_FL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (flags & BTRFS_INODE_NODUMP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) iflags |= FS_NODUMP_FL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) if (flags & BTRFS_INODE_NOATIME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) iflags |= FS_NOATIME_FL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (flags & BTRFS_INODE_DIRSYNC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) iflags |= FS_DIRSYNC_FL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (flags & BTRFS_INODE_NODATACOW)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) iflags |= FS_NOCOW_FL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (flags & BTRFS_INODE_NOCOMPRESS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) iflags |= FS_NOCOMP_FL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) else if (flags & BTRFS_INODE_COMPRESS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) iflags |= FS_COMPR_FL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) return iflags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) * Update inode->i_flags based on the btrfs internal flags.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) void btrfs_sync_inode_flags_to_i_flags(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) struct btrfs_inode *binode = BTRFS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) unsigned int new_fl = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (binode->flags & BTRFS_INODE_SYNC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) new_fl |= S_SYNC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (binode->flags & BTRFS_INODE_IMMUTABLE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) new_fl |= S_IMMUTABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) if (binode->flags & BTRFS_INODE_APPEND)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) new_fl |= S_APPEND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (binode->flags & BTRFS_INODE_NOATIME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) new_fl |= S_NOATIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (binode->flags & BTRFS_INODE_DIRSYNC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) new_fl |= S_DIRSYNC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) set_mask_bits(&inode->i_flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) new_fl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) struct btrfs_inode *binode = BTRFS_I(file_inode(file));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) unsigned int flags = btrfs_inode_flags_to_fsflags(binode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) if (copy_to_user(arg, &flags, sizeof(flags)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) * Check if @flags are a supported and valid set of FS_*_FL flags and that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) * the old and new flags are not conflicting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) static int check_fsflags(unsigned int old_flags, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) FS_NOATIME_FL | FS_NODUMP_FL | \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) FS_SYNC_FL | FS_DIRSYNC_FL | \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) FS_NOCOMP_FL | FS_COMPR_FL |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) FS_NOCOW_FL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) /* COMPR and NOCOMP on new/old are valid */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) /* NOCOW and compression options are mutually exclusive */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) struct btrfs_inode *binode = BTRFS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) struct btrfs_root *root = binode->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) struct btrfs_trans_handle *trans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) unsigned int fsflags, old_fsflags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) const char *comp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) u32 binode_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) if (!inode_owner_or_capable(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) if (btrfs_root_readonly(root))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) return -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) if (copy_from_user(&fsflags, arg, sizeof(fsflags)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) ret = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) inode_lock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) fsflags = btrfs_mask_fsflags_for_type(inode, fsflags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) ret = vfs_ioc_setflags_prepare(inode, old_fsflags, fsflags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) ret = check_fsflags(old_fsflags, fsflags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) binode_flags = binode->flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) if (fsflags & FS_SYNC_FL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) binode_flags |= BTRFS_INODE_SYNC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) binode_flags &= ~BTRFS_INODE_SYNC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) if (fsflags & FS_IMMUTABLE_FL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) binode_flags |= BTRFS_INODE_IMMUTABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) binode_flags &= ~BTRFS_INODE_IMMUTABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) if (fsflags & FS_APPEND_FL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) binode_flags |= BTRFS_INODE_APPEND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) binode_flags &= ~BTRFS_INODE_APPEND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) if (fsflags & FS_NODUMP_FL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) binode_flags |= BTRFS_INODE_NODUMP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) binode_flags &= ~BTRFS_INODE_NODUMP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) if (fsflags & FS_NOATIME_FL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) binode_flags |= BTRFS_INODE_NOATIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) binode_flags &= ~BTRFS_INODE_NOATIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) if (fsflags & FS_DIRSYNC_FL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) binode_flags |= BTRFS_INODE_DIRSYNC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) binode_flags &= ~BTRFS_INODE_DIRSYNC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) if (fsflags & FS_NOCOW_FL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) if (S_ISREG(inode->i_mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) * It's safe to turn csums off here, no extents exist.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) * Otherwise we want the flag to reflect the real COW
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) * status of the file and will not set it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) if (inode->i_size == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) binode_flags |= BTRFS_INODE_NODATACOW |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) BTRFS_INODE_NODATASUM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) binode_flags |= BTRFS_INODE_NODATACOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) * Revert back under same assumptions as above
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (S_ISREG(inode->i_mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) if (inode->i_size == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) binode_flags &= ~(BTRFS_INODE_NODATACOW |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) BTRFS_INODE_NODATASUM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) binode_flags &= ~BTRFS_INODE_NODATACOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) * flag may be changed automatically if compression code won't make
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) * things smaller.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) if (fsflags & FS_NOCOMP_FL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) binode_flags &= ~BTRFS_INODE_COMPRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) binode_flags |= BTRFS_INODE_NOCOMPRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) } else if (fsflags & FS_COMPR_FL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) if (IS_SWAPFILE(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) ret = -ETXTBSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) binode_flags |= BTRFS_INODE_COMPRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) binode_flags &= ~BTRFS_INODE_NOCOMPRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) comp = btrfs_compress_type2str(fs_info->compress_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) if (!comp || comp[0] == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) * 1 for inode item
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) * 2 for properties
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) trans = btrfs_start_transaction(root, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) if (IS_ERR(trans)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) ret = PTR_ERR(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) if (comp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) strlen(comp), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) btrfs_abort_transaction(trans, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) goto out_end_trans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) if (ret && ret != -ENODATA) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) btrfs_abort_transaction(trans, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) goto out_end_trans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) binode->flags = binode_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) btrfs_sync_inode_flags_to_i_flags(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) inode_inc_iversion(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) inode->i_ctime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) ret = btrfs_update_inode(trans, root, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) out_end_trans:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) btrfs_end_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) inode_unlock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) * Translate btrfs internal inode flags to xflags as expected by the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) * FS_IOC_FSGETXATT ioctl. Filter only the supported ones, unknown flags are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) * silently dropped.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) static unsigned int btrfs_inode_flags_to_xflags(unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) unsigned int xflags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) if (flags & BTRFS_INODE_APPEND)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) xflags |= FS_XFLAG_APPEND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) if (flags & BTRFS_INODE_IMMUTABLE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) xflags |= FS_XFLAG_IMMUTABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) if (flags & BTRFS_INODE_NOATIME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) xflags |= FS_XFLAG_NOATIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) if (flags & BTRFS_INODE_NODUMP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) xflags |= FS_XFLAG_NODUMP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) if (flags & BTRFS_INODE_SYNC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) xflags |= FS_XFLAG_SYNC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) return xflags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) /* Check if @flags are a supported and valid set of FS_XFLAGS_* flags */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) static int check_xflags(unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) if (flags & ~(FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE | FS_XFLAG_NOATIME |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) FS_XFLAG_NODUMP | FS_XFLAG_SYNC))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) enum btrfs_exclusive_operation type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) return !cmpxchg(&fs_info->exclusive_operation, BTRFS_EXCLOP_NONE, type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) void btrfs_exclop_finish(struct btrfs_fs_info *fs_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) * Set the xflags from the internal inode flags. The remaining items of fsxattr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) * are zeroed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) static int btrfs_ioctl_fsgetxattr(struct file *file, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) struct btrfs_inode *binode = BTRFS_I(file_inode(file));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) struct fsxattr fa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) simple_fill_fsxattr(&fa, btrfs_inode_flags_to_xflags(binode->flags));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) if (copy_to_user(arg, &fa, sizeof(fa)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) static int btrfs_ioctl_fssetxattr(struct file *file, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) struct btrfs_inode *binode = BTRFS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) struct btrfs_root *root = binode->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) struct btrfs_trans_handle *trans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) struct fsxattr fa, old_fa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) unsigned old_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) unsigned old_i_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) if (!inode_owner_or_capable(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) if (btrfs_root_readonly(root))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) return -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) if (copy_from_user(&fa, arg, sizeof(fa)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) ret = check_xflags(fa.fsx_xflags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) if (fa.fsx_extsize != 0 || fa.fsx_projid != 0 || fa.fsx_cowextsize != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) ret = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) inode_lock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) old_flags = binode->flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) old_i_flags = inode->i_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) simple_fill_fsxattr(&old_fa,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) btrfs_inode_flags_to_xflags(binode->flags));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) ret = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) if (fa.fsx_xflags & FS_XFLAG_SYNC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) binode->flags |= BTRFS_INODE_SYNC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) binode->flags &= ~BTRFS_INODE_SYNC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) if (fa.fsx_xflags & FS_XFLAG_IMMUTABLE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) binode->flags |= BTRFS_INODE_IMMUTABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) binode->flags &= ~BTRFS_INODE_IMMUTABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) if (fa.fsx_xflags & FS_XFLAG_APPEND)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) binode->flags |= BTRFS_INODE_APPEND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) binode->flags &= ~BTRFS_INODE_APPEND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) if (fa.fsx_xflags & FS_XFLAG_NODUMP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) binode->flags |= BTRFS_INODE_NODUMP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) binode->flags &= ~BTRFS_INODE_NODUMP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) if (fa.fsx_xflags & FS_XFLAG_NOATIME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) binode->flags |= BTRFS_INODE_NOATIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) binode->flags &= ~BTRFS_INODE_NOATIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) /* 1 item for the inode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) trans = btrfs_start_transaction(root, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) if (IS_ERR(trans)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) ret = PTR_ERR(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) btrfs_sync_inode_flags_to_i_flags(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) inode_inc_iversion(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) inode->i_ctime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) ret = btrfs_update_inode(trans, root, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) btrfs_end_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) binode->flags = old_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) inode->i_flags = old_i_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) inode_unlock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) return put_user(inode->i_generation, arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) struct btrfs_device *device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) struct request_queue *q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) struct fstrim_range range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) u64 minlen = ULLONG_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) u64 num_devices = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) * If the fs is mounted with nologreplay, which requires it to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) * mounted in RO mode as well, we can not allow discard on free space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) * inside block groups, because log trees refer to extents that are not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) * pinned in a block group's free space cache (pinning the extents is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) * precisely the first phase of replaying a log tree).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) if (btrfs_test_opt(fs_info, NOLOGREPLAY))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) return -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) dev_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) if (!device->bdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) q = bdev_get_queue(device->bdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) if (blk_queue_discard(q)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) num_devices++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) minlen = min_t(u64, q->limits.discard_granularity,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) minlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) if (!num_devices)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) if (copy_from_user(&range, arg, sizeof(range)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) * NOTE: Don't truncate the range using super->total_bytes. Bytenr of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) * block group is in the logical address space, which can be any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) * sectorsize aligned bytenr in the range [0, U64_MAX].
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) if (range.len < fs_info->sb->s_blocksize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) range.minlen = max(range.minlen, minlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) ret = btrfs_trim_fs(fs_info, &range);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) if (copy_to_user(arg, &range, sizeof(range)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) int __pure btrfs_is_empty_uuid(u8 *uuid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) for (i = 0; i < BTRFS_UUID_SIZE; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) if (uuid[i])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) static noinline int create_subvol(struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) const char *name, int namelen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) struct btrfs_qgroup_inherit *inherit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) struct btrfs_trans_handle *trans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) struct btrfs_key key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) struct btrfs_root_item *root_item;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) struct btrfs_inode_item *inode_item;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) struct extent_buffer *leaf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) struct btrfs_root *root = BTRFS_I(dir)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) struct btrfs_root *new_root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) struct btrfs_block_rsv block_rsv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) struct timespec64 cur_time = current_time(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) dev_t anon_dev = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) u64 objectid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) u64 index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) root_item = kzalloc(sizeof(*root_item), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) if (!root_item)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) ret = btrfs_find_free_objectid(fs_info->tree_root, &objectid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) goto fail_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) ret = get_anon_bdev(&anon_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) goto fail_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) * Don't create subvolume whose level is not zero. Or qgroup will be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) * screwed up since it assumes subvolume qgroup's level to be 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) if (btrfs_qgroup_level(objectid)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) ret = -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) goto fail_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) * The same as the snapshot creation, please see the comment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) * of create_snapshot().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) goto fail_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) trans = btrfs_start_transaction(root, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) if (IS_ERR(trans)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) ret = PTR_ERR(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) btrfs_subvolume_release_metadata(root, &block_rsv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) goto fail_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) trans->block_rsv = &block_rsv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) trans->bytes_reserved = block_rsv.size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) BTRFS_NESTING_NORMAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) if (IS_ERR(leaf)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) ret = PTR_ERR(leaf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) btrfs_mark_buffer_dirty(leaf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) inode_item = &root_item->inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) btrfs_set_stack_inode_generation(inode_item, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) btrfs_set_stack_inode_size(inode_item, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) btrfs_set_stack_inode_nlink(inode_item, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) btrfs_set_stack_inode_nbytes(inode_item,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) fs_info->nodesize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) btrfs_set_root_flags(root_item, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) btrfs_set_root_limit(root_item, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) btrfs_set_root_bytenr(root_item, leaf->start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) btrfs_set_root_generation(root_item, trans->transid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) btrfs_set_root_level(root_item, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) btrfs_set_root_refs(root_item, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) btrfs_set_root_used(root_item, leaf->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) btrfs_set_root_last_snapshot(root_item, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) btrfs_set_root_generation_v2(root_item,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) btrfs_root_generation(root_item));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) generate_random_guid(root_item->uuid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) root_item->ctime = root_item->otime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) btrfs_set_root_ctransid(root_item, trans->transid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) btrfs_set_root_otransid(root_item, trans->transid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) btrfs_tree_unlock(leaf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) btrfs_set_root_dirid(root_item, new_dirid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) key.objectid = objectid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) key.offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) key.type = BTRFS_ROOT_ITEM_KEY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) ret = btrfs_insert_root(trans, fs_info->tree_root, &key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) root_item);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) * Since we don't abort the transaction in this case, free the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) * tree block so that we don't leak space and leave the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) * filesystem in an inconsistent state (an extent item in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) * extent tree without backreferences). Also no need to have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) * the tree block locked since it is not in any tree at this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) * point, so no other task can find it and use it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) btrfs_free_tree_block(trans, root, leaf, 0, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) free_extent_buffer(leaf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) free_extent_buffer(leaf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) leaf = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) key.offset = (u64)-1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) if (IS_ERR(new_root)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) free_anon_bdev(anon_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) ret = PTR_ERR(new_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) btrfs_abort_transaction(trans, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) /* Freeing will be done in btrfs_put_root() of new_root */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) anon_dev = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) btrfs_record_root_in_trans(trans, new_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) btrfs_put_root(new_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) /* We potentially lose an unused inode item here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) btrfs_abort_transaction(trans, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) mutex_lock(&new_root->objectid_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) new_root->highest_objectid = new_dirid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) mutex_unlock(&new_root->objectid_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) * insert the directory item
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) ret = btrfs_set_inode_index(BTRFS_I(dir), &index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) btrfs_abort_transaction(trans, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) BTRFS_FT_DIR, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) btrfs_abort_transaction(trans, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) ret = btrfs_update_inode(trans, root, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) btrfs_abort_transaction(trans, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) btrfs_ino(BTRFS_I(dir)), index, name, namelen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) btrfs_abort_transaction(trans, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) ret = btrfs_uuid_tree_add(trans, root_item->uuid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) BTRFS_UUID_KEY_SUBVOL, objectid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) btrfs_abort_transaction(trans, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) kfree(root_item);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) trans->block_rsv = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) trans->bytes_reserved = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) btrfs_subvolume_release_metadata(root, &block_rsv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) err = btrfs_commit_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) if (err && !ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) ret = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) inode = btrfs_lookup_dentry(dir, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) if (IS_ERR(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) return PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) d_instantiate(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) fail_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) if (anon_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) free_anon_bdev(anon_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) kfree(root_item);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) static int create_snapshot(struct btrfs_root *root, struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) struct dentry *dentry, bool readonly,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) struct btrfs_qgroup_inherit *inherit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) struct btrfs_pending_snapshot *pending_snapshot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) struct btrfs_trans_handle *trans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) if (atomic_read(&root->nr_swapfiles)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) btrfs_warn(fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) "cannot snapshot subvolume with active swapfile");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) return -ETXTBSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) if (!pending_snapshot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) ret = get_anon_bdev(&pending_snapshot->anon_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) goto free_pending;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) pending_snapshot->path = btrfs_alloc_path();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) if (!pending_snapshot->root_item || !pending_snapshot->path) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) goto free_pending;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) btrfs_init_block_rsv(&pending_snapshot->block_rsv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) BTRFS_BLOCK_RSV_TEMP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) * 1 - parent dir inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) * 2 - dir entries
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) * 1 - root item
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) * 2 - root ref/backref
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) * 1 - root of snapshot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) * 1 - UUID item
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) &pending_snapshot->block_rsv, 8,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) goto free_pending;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) pending_snapshot->dentry = dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) pending_snapshot->root = root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) pending_snapshot->readonly = readonly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) pending_snapshot->dir = dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) pending_snapshot->inherit = inherit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) trans = btrfs_start_transaction(root, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) if (IS_ERR(trans)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) ret = PTR_ERR(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) spin_lock(&fs_info->trans_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) list_add(&pending_snapshot->list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) &trans->transaction->pending_snapshots);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) spin_unlock(&fs_info->trans_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) ret = btrfs_commit_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) ret = pending_snapshot->error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) ret = btrfs_orphan_cleanup(pending_snapshot->snap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) if (IS_ERR(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) ret = PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) d_instantiate(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) pending_snapshot->anon_dev = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) /* Prevent double freeing of anon_dev */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) if (ret && pending_snapshot->snap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) pending_snapshot->snap->anon_dev = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) btrfs_put_root(pending_snapshot->snap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) free_pending:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) if (pending_snapshot->anon_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) free_anon_bdev(pending_snapshot->anon_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) kfree(pending_snapshot->root_item);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) btrfs_free_path(pending_snapshot->path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) kfree(pending_snapshot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) /* copy of may_delete in fs/namei.c()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) * Check whether we can remove a link victim from directory dir, check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) * whether the type of victim is right.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) * 1. We can't do it if dir is read-only (done in permission())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) * 2. We should have write and exec permissions on dir
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) * 3. We can't remove anything from append-only dir
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) * 4. We can't do anything with immutable dir (done in permission())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) * 5. If the sticky bit on dir is set we should either
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) * a. be owner of dir, or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) * b. be owner of victim, or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) * c. have CAP_FOWNER capability
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) * 6. If the victim is append-only or immutable we can't do anything with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) * links pointing to it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) * 9. We can't remove a root or mountpoint.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) * nfs_async_unlink().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) if (d_really_is_negative(victim))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) BUG_ON(d_inode(victim->d_parent) != dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) if (IS_APPEND(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) if (isdir) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) if (!d_is_dir(victim))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) return -ENOTDIR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) if (IS_ROOT(victim))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) } else if (d_is_dir(victim))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) return -EISDIR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) if (IS_DEADDIR(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) if (victim->d_flags & DCACHE_NFSFS_RENAMED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) /* copy of may_create in fs/namei.c() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) if (d_really_is_positive(child))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) return -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) if (IS_DEADDIR(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) return inode_permission(dir, MAY_WRITE | MAY_EXEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) * Create a new subvolume below @parent. This is largely modeled after
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) * inside this filesystem so it's quite a bit simpler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) static noinline int btrfs_mksubvol(const struct path *parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) const char *name, int namelen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) struct btrfs_root *snap_src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) bool readonly,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) struct btrfs_qgroup_inherit *inherit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) struct inode *dir = d_inode(parent->dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) struct dentry *dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) if (error == -EINTR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) dentry = lookup_one_len(name, parent->dentry, namelen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) error = PTR_ERR(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) if (IS_ERR(dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) error = btrfs_may_create(dir, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) * even if this name doesn't exist, we may get hash collisions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) * check for them now when we can safely fail
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) dir->i_ino, name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) namelen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) down_read(&fs_info->subvol_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) goto out_up_read;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) if (snap_src)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) error = create_snapshot(snap_src, dir, dentry, readonly, inherit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) error = create_subvol(dir, dentry, name, namelen, inherit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) if (!error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) fsnotify_mkdir(dir, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) out_up_read:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) up_read(&fs_info->subvol_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) out_dput:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) dput(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) inode_unlock(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) static noinline int btrfs_mksnapshot(const struct path *parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) const char *name, int namelen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) struct btrfs_root *root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) bool readonly,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) struct btrfs_qgroup_inherit *inherit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) bool snapshot_force_cow = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) * Force new buffered writes to reserve space even when NOCOW is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) * possible. This is to avoid later writeback (running dealloc) to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) * fallback to COW mode and unexpectedly fail with ENOSPC.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) btrfs_drew_read_lock(&root->snapshot_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) ret = btrfs_start_delalloc_snapshot(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) * All previous writes have started writeback in NOCOW mode, so now
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) * we force future writes to fallback to COW mode during snapshot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) * creation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) atomic_inc(&root->snapshot_force_cow);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) snapshot_force_cow = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) ret = btrfs_mksubvol(parent, name, namelen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) root, readonly, inherit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) if (snapshot_force_cow)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) atomic_dec(&root->snapshot_force_cow);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) btrfs_drew_read_unlock(&root->snapshot_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) * When we're defragging a range, we don't want to kick it off again
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) * if it is really just waiting for delalloc to send it down.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) * If we find a nice big extent or delalloc range for the bytes in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) * file you want to defrag, we return 0 to let you know to skip this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) * part of the file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) struct extent_map *em = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) u64 end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) read_lock(&em_tree->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) read_unlock(&em_tree->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) if (em) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) end = extent_map_end(em);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) free_extent_map(em);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) if (end - offset > thresh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) /* if we already have a nice delalloc here, just stop */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) thresh /= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) end = count_range_bits(io_tree, &offset, offset + thresh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) thresh, EXTENT_DELALLOC, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) if (end >= thresh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) * helper function to walk through a file and find extents
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) * newer than a specific transid, and smaller than thresh.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) * This is used by the defragging code to find new and small
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) * extents
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) static int find_new_extents(struct btrfs_root *root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) struct inode *inode, u64 newer_than,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) u64 *off, u32 thresh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) struct btrfs_path *path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) struct btrfs_key min_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) struct extent_buffer *leaf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) struct btrfs_file_extent_item *extent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) int type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) u64 ino = btrfs_ino(BTRFS_I(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) path = btrfs_alloc_path();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) if (!path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) min_key.objectid = ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) min_key.type = BTRFS_EXTENT_DATA_KEY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) min_key.offset = *off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) ret = btrfs_search_forward(root, &min_key, path, newer_than);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) if (ret != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) goto none;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) process_slot:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) if (min_key.objectid != ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) goto none;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) if (min_key.type != BTRFS_EXTENT_DATA_KEY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) goto none;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) leaf = path->nodes[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) extent = btrfs_item_ptr(leaf, path->slots[0],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) struct btrfs_file_extent_item);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) type = btrfs_file_extent_type(leaf, extent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) if (type == BTRFS_FILE_EXTENT_REG &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) check_defrag_in_cache(inode, min_key.offset, thresh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) *off = min_key.offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) btrfs_free_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) path->slots[0]++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) if (path->slots[0] < btrfs_header_nritems(leaf)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) goto process_slot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) if (min_key.offset == (u64)-1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) goto none;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) min_key.offset++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) btrfs_release_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) none:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) btrfs_free_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) struct extent_map *em;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) u64 len = PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) * hopefully we have this extent in the tree already, try without
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) * the full extent lock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) read_lock(&em_tree->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) em = lookup_extent_mapping(em_tree, start, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) read_unlock(&em_tree->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) if (!em) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) struct extent_state *cached = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) u64 end = start + len - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) /* get the big lock and read metadata off disk */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) lock_extent_bits(io_tree, start, end, &cached);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) unlock_extent_cached(io_tree, start, end, &cached);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) if (IS_ERR(em))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) return em;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) struct extent_map *next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) bool ret = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) /* this is the last extent */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) if (em->start + em->len >= i_size_read(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) next = defrag_lookup_extent(inode, em->start + em->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) ret = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) else if ((em->block_start + em->block_len == next->block_start) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) (em->block_len > SZ_128K && next->block_len > SZ_128K))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) ret = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) free_extent_map(next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) static int should_defrag_range(struct inode *inode, u64 start, u32 thresh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) u64 *last_len, u64 *skip, u64 *defrag_end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) int compress)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) struct extent_map *em;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) int ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) bool next_mergeable = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) bool prev_mergeable = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) * make sure that once we start defragging an extent, we keep on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) * defragging it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) if (start < *defrag_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) *skip = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) em = defrag_lookup_extent(inode, start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) if (!em)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) /* this will cover holes, and inline extents */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) if (!*defrag_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236) prev_mergeable = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) next_mergeable = defrag_check_next_extent(inode, em);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) * we hit a real extent, if it is big or the next extent is not a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241) * real extent, don't bother defragging it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) if (!compress && (*last_len == 0 || *last_len >= thresh) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) (em->len >= thresh || (!next_mergeable && !prev_mergeable)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) * last_len ends up being a counter of how many bytes we've defragged.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) * every time we choose not to defrag an extent, we reset *last_len
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) * so that the next tiny extent will force a defrag.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) * The end result of this is that tiny extents before a single big
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) * extent will force at least part of that big extent to be defragged.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) *defrag_end = extent_map_end(em);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) *last_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) *skip = extent_map_end(em);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) *defrag_end = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) free_extent_map(em);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) * it doesn't do much good to defrag one or two pages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269) * at a time. This pulls in a nice chunk of pages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) * to COW and defrag.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) * It also makes sure the delalloc code has enough
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273) * dirty data to avoid making new small extents as part
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) * of the defrag
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276) * It's a good idea to start RA on this range
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) * before calling this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) static int cluster_pages_for_defrag(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) struct page **pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) unsigned long start_index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) unsigned long num_pages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) unsigned long file_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) u64 isize = i_size_read(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) u64 page_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287) u64 page_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) u64 page_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) u64 start = (u64)start_index << PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) u64 search_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) int i_done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) struct btrfs_ordered_extent *ordered;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295) struct extent_state *cached_state = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) struct extent_io_tree *tree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) struct extent_changeset *data_reserved = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) file_end = (isize - 1) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301) if (!isize || start_index > file_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) start, page_cnt << PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) i_done = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) tree = &BTRFS_I(inode)->io_tree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313) /* step one, lock all the pages */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) for (i = 0; i < page_cnt; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) again:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317) page = find_or_create_page(inode->i_mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318) start_index + i, mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) page_start = page_offset(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) page_end = page_start + PAGE_SIZE - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) lock_extent_bits(tree, page_start, page_end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326) &cached_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) ordered = btrfs_lookup_ordered_extent(BTRFS_I(inode),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) page_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) unlock_extent_cached(tree, page_start, page_end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330) &cached_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331) if (!ordered)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335) btrfs_start_ordered_extent(ordered, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) btrfs_put_ordered_extent(ordered);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) lock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339) * we unlocked the page above, so we need check if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340) * it was released or not.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) if (page->mapping != inode->i_mapping) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344) put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) goto again;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349) if (!PageUptodate(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) btrfs_readpage(NULL, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) lock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) if (!PageUptodate(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354) put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360) if (page->mapping != inode->i_mapping) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) goto again;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366) pages[i] = page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) i_done++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369) if (!i_done || ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) if (!(inode->i_sb->s_flags & SB_ACTIVE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) * so now we have a nice long stream of locked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377) * and up to date pages, lets wait on them
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379) for (i = 0; i < i_done; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380) wait_on_page_writeback(pages[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382) page_start = page_offset(pages[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383) page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385) lock_extent_bits(&BTRFS_I(inode)->io_tree,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386) page_start, page_end - 1, &cached_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389) * When defragmenting we skip ranges that have holes or inline extents,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) * (check should_defrag_range()), to avoid unnecessary IO and wasting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391) * space. At btrfs_defrag_file(), we check if a range should be defragged
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) * before locking the inode and then, if it should, we trigger a sync
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393) * page cache readahead - we lock the inode only after that to avoid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394) * blocking for too long other tasks that possibly want to operate on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395) * other file ranges. But before we were able to get the inode lock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396) * some other task may have punched a hole in the range, or we may have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397) * now an inline extent, in which case we should not defrag. So check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398) * for that here, where we have the inode and the range locked, and bail
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399) * out if that happened.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401) search_start = page_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402) while (search_start < page_end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) struct extent_map *em;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, search_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) page_end - search_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407) if (IS_ERR(em)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) ret = PTR_ERR(em);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409) goto out_unlock_range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412) free_extent_map(em);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413) /* Ok, 0 means we did not defrag anything */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415) goto out_unlock_range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417) search_start = extent_map_end(em);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418) free_extent_map(em);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421) clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423) EXTENT_DEFRAG, 0, 0, &cached_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425) if (i_done != page_cnt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426) spin_lock(&BTRFS_I(inode)->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427) btrfs_mod_outstanding_extents(BTRFS_I(inode), 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428) spin_unlock(&BTRFS_I(inode)->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429) btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) start, (page_cnt - i_done) << PAGE_SHIFT, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434) set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435) &cached_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437) unlock_extent_cached(&BTRFS_I(inode)->io_tree,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438) page_start, page_end - 1, &cached_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440) for (i = 0; i < i_done; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441) clear_page_dirty_for_io(pages[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442) ClearPageChecked(pages[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443) set_page_extent_mapped(pages[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444) set_page_dirty(pages[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445) unlock_page(pages[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446) put_page(pages[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448) btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449) extent_changeset_free(data_reserved);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450) return i_done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) out_unlock_range:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453) unlock_extent_cached(&BTRFS_I(inode)->io_tree,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454) page_start, page_end - 1, &cached_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456) for (i = 0; i < i_done; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) unlock_page(pages[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1458) put_page(pages[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1459) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1460) btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1461) start, page_cnt << PAGE_SHIFT, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1462) btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1463) extent_changeset_free(data_reserved);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1464) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1466) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1468) int btrfs_defrag_file(struct inode *inode, struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1469) struct btrfs_ioctl_defrag_range_args *range,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1470) u64 newer_than, unsigned long max_to_defrag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1471) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1472) struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1473) struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1474) struct file_ra_state *ra = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1475) unsigned long last_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1476) u64 isize = i_size_read(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1477) u64 last_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1478) u64 skip = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1479) u64 defrag_end = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1480) u64 newer_off = range->start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1481) unsigned long i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1482) unsigned long ra_index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1483) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1484) int defrag_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1485) int compress_type = BTRFS_COMPRESS_ZLIB;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1486) u32 extent_thresh = range->extent_thresh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1487) unsigned long max_cluster = SZ_256K >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1488) unsigned long cluster = max_cluster;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1489) u64 new_align = ~((u64)SZ_128K - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1490) struct page **pages = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1491) bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1493) if (isize == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1494) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1495)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1496) if (range->start >= isize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1497) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1498)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1499) if (do_compress) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1500) if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1501) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1502) if (range->compress_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1503) compress_type = range->compress_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1504) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1506) if (extent_thresh == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1507) extent_thresh = SZ_256K;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1508)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1509) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1510) * If we were not given a file, allocate a readahead context. As
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1511) * readahead is just an optimization, defrag will work without it so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1512) * we don't error out.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1513) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1514) if (!file) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1515) ra = kzalloc(sizeof(*ra), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1516) if (ra)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1517) file_ra_state_init(ra, inode->i_mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1518) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1519) ra = &file->f_ra;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1520) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1521)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1522) pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1523) if (!pages) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1524) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1525) goto out_ra;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1526) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1527)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1528) /* find the last page to defrag */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1529) if (range->start + range->len > range->start) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1530) last_index = min_t(u64, isize - 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1531) range->start + range->len - 1) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1532) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1533) last_index = (isize - 1) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1534) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1536) if (newer_than) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1537) ret = find_new_extents(root, inode, newer_than,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1538) &newer_off, SZ_64K);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1539) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1540) range->start = newer_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1541) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1542) * we always align our defrag to help keep
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1543) * the extents in the file evenly spaced
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1544) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1545) i = (newer_off & new_align) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1546) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1547) goto out_ra;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1548) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1549) i = range->start >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1550) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1551) if (!max_to_defrag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1552) max_to_defrag = last_index - i + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1553)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1554) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1555) * make writeback starts from i, so the defrag range can be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1556) * written sequentially.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1557) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1558) if (i < inode->i_mapping->writeback_index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1559) inode->i_mapping->writeback_index = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1560)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1561) while (i <= last_index && defrag_count < max_to_defrag &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1562) (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1563) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1564) * make sure we stop running if someone unmounts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1565) * the FS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1566) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1567) if (!(inode->i_sb->s_flags & SB_ACTIVE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1568) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1569)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1570) if (btrfs_defrag_cancelled(fs_info)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1571) btrfs_debug(fs_info, "defrag_file cancelled");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1572) ret = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1573) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1574) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1576) if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1577) extent_thresh, &last_len, &skip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1578) &defrag_end, do_compress)){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1579) unsigned long next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1580) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1581) * the should_defrag function tells us how much to skip
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1582) * bump our counter by the suggested amount
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1583) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1584) next = DIV_ROUND_UP(skip, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1585) i = max(i + 1, next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1586) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1587) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1588)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1589) if (!newer_than) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1590) cluster = (PAGE_ALIGN(defrag_end) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1591) PAGE_SHIFT) - i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1592) cluster = min(cluster, max_cluster);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1593) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1594) cluster = max_cluster;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1595) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1597) if (i + cluster > ra_index) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1598) ra_index = max(i, ra_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1599) if (ra)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1600) page_cache_sync_readahead(inode->i_mapping, ra,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1601) file, ra_index, cluster);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1602) ra_index += cluster;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1603) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1604)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1605) inode_lock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1606) if (IS_SWAPFILE(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1607) ret = -ETXTBSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1608) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1609) if (do_compress)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1610) BTRFS_I(inode)->defrag_compress = compress_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1611) ret = cluster_pages_for_defrag(inode, pages, i, cluster);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1612) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1613) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1614) inode_unlock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1615) goto out_ra;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1616) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1618) defrag_count += ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1619) balance_dirty_pages_ratelimited(inode->i_mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1620) inode_unlock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1622) if (newer_than) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1623) if (newer_off == (u64)-1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1624) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1625)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1626) if (ret > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1627) i += ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1628)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1629) newer_off = max(newer_off + 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1630) (u64)i << PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1631)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1632) ret = find_new_extents(root, inode, newer_than,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1633) &newer_off, SZ_64K);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1634) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1635) range->start = newer_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1636) i = (newer_off & new_align) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1637) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1638) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1639) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1640) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1641) if (ret > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1642) i += ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1643) last_len += ret << PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1644) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1645) i++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1646) last_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1647) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1648) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1649) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1650)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1651) if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1652) filemap_flush(inode->i_mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1653) if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1654) &BTRFS_I(inode)->runtime_flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1655) filemap_flush(inode->i_mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1656) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1657)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1658) if (range->compress_type == BTRFS_COMPRESS_LZO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1659) btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1660) } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1661) btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1662) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1663)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1664) ret = defrag_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1665)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1666) out_ra:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1667) if (do_compress) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1668) inode_lock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1669) BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1670) inode_unlock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1671) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1672) if (!file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1673) kfree(ra);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1674) kfree(pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1675) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1676) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1678) static noinline int btrfs_ioctl_resize(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1679) void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1680) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1681) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1682) struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1683) u64 new_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1684) u64 old_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1685) u64 devid = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1686) struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1687) struct btrfs_ioctl_vol_args *vol_args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1688) struct btrfs_trans_handle *trans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1689) struct btrfs_device *device = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1690) char *sizestr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1691) char *retptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1692) char *devstr = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1693) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1694) int mod = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1695)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1696) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1697) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1698)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1699) ret = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1700) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1701) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1702)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1703) if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_RESIZE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1704) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1705) return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1706) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1707)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1708) vol_args = memdup_user(arg, sizeof(*vol_args));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1709) if (IS_ERR(vol_args)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1710) ret = PTR_ERR(vol_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1711) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1712) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1713)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1714) vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1715)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1716) sizestr = vol_args->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1717) devstr = strchr(sizestr, ':');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1718) if (devstr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1719) sizestr = devstr + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1720) *devstr = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1721) devstr = vol_args->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1722) ret = kstrtoull(devstr, 10, &devid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1723) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1724) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1725) if (!devid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1726) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1727) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1728) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1729) btrfs_info(fs_info, "resizing devid %llu", devid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1730) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1731)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1732) device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1733) if (!device) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1734) btrfs_info(fs_info, "resizer unable to find device %llu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1735) devid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1736) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1737) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1738) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1739)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1740) if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1741) btrfs_info(fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1742) "resizer unable to apply on readonly device %llu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1743) devid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1744) ret = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1745) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1746) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1747)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1748) if (!strcmp(sizestr, "max"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1749) new_size = device->bdev->bd_inode->i_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1750) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1751) if (sizestr[0] == '-') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1752) mod = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1753) sizestr++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1754) } else if (sizestr[0] == '+') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1755) mod = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1756) sizestr++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1757) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1758) new_size = memparse(sizestr, &retptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1759) if (*retptr != '\0' || new_size == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1760) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1761) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1762) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1763) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1764)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1765) if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1766) ret = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1767) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1768) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1769)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1770) old_size = btrfs_device_get_total_bytes(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1771)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1772) if (mod < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1773) if (new_size > old_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1774) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1775) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1776) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1777) new_size = old_size - new_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1778) } else if (mod > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1779) if (new_size > ULLONG_MAX - old_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1780) ret = -ERANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1781) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1782) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1783) new_size = old_size + new_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1784) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1785)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1786) if (new_size < SZ_256M) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1787) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1788) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1789) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1790) if (new_size > device->bdev->bd_inode->i_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1791) ret = -EFBIG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1792) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1793) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1795) new_size = round_down(new_size, fs_info->sectorsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1796)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1797) if (new_size > old_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1798) trans = btrfs_start_transaction(root, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1799) if (IS_ERR(trans)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1800) ret = PTR_ERR(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1801) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1802) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1803) ret = btrfs_grow_device(trans, device, new_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1804) btrfs_commit_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1805) } else if (new_size < old_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1806) ret = btrfs_shrink_device(device, new_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1807) } /* equal, nothing need to do */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1808)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1809) if (ret == 0 && new_size != old_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1810) btrfs_info_in_rcu(fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1811) "resize device %s (devid %llu) from %llu to %llu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1812) rcu_str_deref(device->name), device->devid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1813) old_size, new_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1814) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1815) kfree(vol_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1816) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1817) btrfs_exclop_finish(fs_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1818) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1819) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1820) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1821)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1822) static noinline int __btrfs_ioctl_snap_create(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1823) const char *name, unsigned long fd, int subvol,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1824) bool readonly,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1825) struct btrfs_qgroup_inherit *inherit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1826) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1827) int namelen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1828) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1829)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1830) if (!S_ISDIR(file_inode(file)->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1831) return -ENOTDIR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1832)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1833) ret = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1834) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1835) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1836)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1837) namelen = strlen(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1838) if (strchr(name, '/')) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1839) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1840) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1841) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1842)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1843) if (name[0] == '.' &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1844) (namelen == 1 || (name[1] == '.' && namelen == 2))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1845) ret = -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1846) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1847) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1848)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1849) if (subvol) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1850) ret = btrfs_mksubvol(&file->f_path, name, namelen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1851) NULL, readonly, inherit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1852) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1853) struct fd src = fdget(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1854) struct inode *src_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1855) if (!src.file) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1856) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1857) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1858) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1859)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1860) src_inode = file_inode(src.file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1861) if (src_inode->i_sb != file_inode(file)->i_sb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1862) btrfs_info(BTRFS_I(file_inode(file))->root->fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1863) "Snapshot src from another FS");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1864) ret = -EXDEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1865) } else if (!inode_owner_or_capable(src_inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1866) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1867) * Subvolume creation is not restricted, but snapshots
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1868) * are limited to own subvolumes only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1869) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1870) ret = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1871) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1872) ret = btrfs_mksnapshot(&file->f_path, name, namelen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1873) BTRFS_I(src_inode)->root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1874) readonly, inherit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1875) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1876) fdput(src);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1877) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1878) out_drop_write:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1879) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1880) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1881) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1882) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1883)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1884) static noinline int btrfs_ioctl_snap_create(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1885) void __user *arg, int subvol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1886) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1887) struct btrfs_ioctl_vol_args *vol_args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1888) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1889)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1890) if (!S_ISDIR(file_inode(file)->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1891) return -ENOTDIR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1892)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1893) vol_args = memdup_user(arg, sizeof(*vol_args));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1894) if (IS_ERR(vol_args))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1895) return PTR_ERR(vol_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1896) vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1897)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1898) ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1899) subvol, false, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1900)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1901) kfree(vol_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1902) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1903) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1904)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1905) static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1906) void __user *arg, int subvol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1907) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1908) struct btrfs_ioctl_vol_args_v2 *vol_args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1909) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1910) bool readonly = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1911) struct btrfs_qgroup_inherit *inherit = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1912)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1913) if (!S_ISDIR(file_inode(file)->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1914) return -ENOTDIR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1915)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1916) vol_args = memdup_user(arg, sizeof(*vol_args));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1917) if (IS_ERR(vol_args))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1918) return PTR_ERR(vol_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1919) vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1920)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1921) if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1922) ret = -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1923) goto free_args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1924) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1925)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1926) if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1927) readonly = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1928) if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1929) u64 nums;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1930)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1931) if (vol_args->size < sizeof(*inherit) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1932) vol_args->size > PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1933) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1934) goto free_args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1935) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1936) inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1937) if (IS_ERR(inherit)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1938) ret = PTR_ERR(inherit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1939) goto free_args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1940) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1941)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1942) if (inherit->num_qgroups > PAGE_SIZE ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1943) inherit->num_ref_copies > PAGE_SIZE ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1944) inherit->num_excl_copies > PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1945) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1946) goto free_inherit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1947) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1948)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1949) nums = inherit->num_qgroups + 2 * inherit->num_ref_copies +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1950) 2 * inherit->num_excl_copies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1951) if (vol_args->size != struct_size(inherit, qgroups, nums)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1952) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1953) goto free_inherit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1954) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1955) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1956)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1957) ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1958) subvol, readonly, inherit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1959) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1960) goto free_inherit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1961) free_inherit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1962) kfree(inherit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1963) free_args:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1964) kfree(vol_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1965) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1966) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1967)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1968) static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1969) void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1970) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1971) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1972) struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1973) struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1974) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1975) u64 flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1976)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1977) if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1978) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1979)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1980) down_read(&fs_info->subvol_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1981) if (btrfs_root_readonly(root))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1982) flags |= BTRFS_SUBVOL_RDONLY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1983) up_read(&fs_info->subvol_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1984)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1985) if (copy_to_user(arg, &flags, sizeof(flags)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1986) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1987)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1988) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1989) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1990)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1991) static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1992) void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1993) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1994) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1995) struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1996) struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1997) struct btrfs_trans_handle *trans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1998) u64 root_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1999) u64 flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2000) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2001)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2002) if (!inode_owner_or_capable(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2003) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2004)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2005) ret = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2006) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2007) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2008)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2009) if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2010) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2011) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2012) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2013)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2014) if (copy_from_user(&flags, arg, sizeof(flags))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2015) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2016) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2017) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2018)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2019) if (flags & ~BTRFS_SUBVOL_RDONLY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2020) ret = -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2021) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2022) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2023)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2024) down_write(&fs_info->subvol_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2025)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2026) /* nothing to do */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2027) if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2028) goto out_drop_sem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2029)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2030) root_flags = btrfs_root_flags(&root->root_item);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2031) if (flags & BTRFS_SUBVOL_RDONLY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2032) btrfs_set_root_flags(&root->root_item,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2033) root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2034) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2035) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2036) * Block RO -> RW transition if this subvolume is involved in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2037) * send
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2038) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2039) spin_lock(&root->root_item_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2040) if (root->send_in_progress == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2041) btrfs_set_root_flags(&root->root_item,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2042) root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2043) spin_unlock(&root->root_item_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2044) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2045) spin_unlock(&root->root_item_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2046) btrfs_warn(fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2047) "Attempt to set subvolume %llu read-write during send",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2048) root->root_key.objectid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2049) ret = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2050) goto out_drop_sem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2051) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2052) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2053)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2054) trans = btrfs_start_transaction(root, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2055) if (IS_ERR(trans)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2056) ret = PTR_ERR(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2057) goto out_reset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2058) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2059)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2060) ret = btrfs_update_root(trans, fs_info->tree_root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2061) &root->root_key, &root->root_item);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2062) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2063) btrfs_end_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2064) goto out_reset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2065) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2066)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2067) ret = btrfs_commit_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2068)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2069) out_reset:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2070) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2071) btrfs_set_root_flags(&root->root_item, root_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2072) out_drop_sem:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2073) up_write(&fs_info->subvol_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2074) out_drop_write:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2075) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2076) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2077) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2078) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2079)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2080) static noinline int key_in_sk(struct btrfs_key *key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2081) struct btrfs_ioctl_search_key *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2082) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2083) struct btrfs_key test;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2084) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2085)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2086) test.objectid = sk->min_objectid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2087) test.type = sk->min_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2088) test.offset = sk->min_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2089)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2090) ret = btrfs_comp_cpu_keys(key, &test);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2091) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2092) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2093)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2094) test.objectid = sk->max_objectid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2095) test.type = sk->max_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2096) test.offset = sk->max_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2097)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2098) ret = btrfs_comp_cpu_keys(key, &test);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2099) if (ret > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2100) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2101) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2104) static noinline int copy_to_sk(struct btrfs_path *path,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2105) struct btrfs_key *key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2106) struct btrfs_ioctl_search_key *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2107) size_t *buf_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2108) char __user *ubuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2109) unsigned long *sk_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2110) int *num_found)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2112) u64 found_transid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2113) struct extent_buffer *leaf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2114) struct btrfs_ioctl_search_header sh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2115) struct btrfs_key test;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2116) unsigned long item_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2117) unsigned long item_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2118) int nritems;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2119) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2120) int slot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2121) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2123) leaf = path->nodes[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2124) slot = path->slots[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2125) nritems = btrfs_header_nritems(leaf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2127) if (btrfs_header_generation(leaf) > sk->max_transid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2128) i = nritems;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2129) goto advance_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2131) found_transid = btrfs_header_generation(leaf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2133) for (i = slot; i < nritems; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2134) item_off = btrfs_item_ptr_offset(leaf, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2135) item_len = btrfs_item_size_nr(leaf, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2137) btrfs_item_key_to_cpu(leaf, key, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2138) if (!key_in_sk(key, sk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2139) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2141) if (sizeof(sh) + item_len > *buf_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2142) if (*num_found) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2143) ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2144) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2147) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2148) * return one empty item back for v1, which does not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2149) * handle -EOVERFLOW
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2150) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2152) *buf_size = sizeof(sh) + item_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2153) item_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2154) ret = -EOVERFLOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2157) if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2158) ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2159) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2162) sh.objectid = key->objectid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2163) sh.offset = key->offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2164) sh.type = key->type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2165) sh.len = item_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2166) sh.transid = found_transid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2168) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2169) * Copy search result header. If we fault then loop again so we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2170) * can fault in the pages and -EFAULT there if there's a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2171) * problem. Otherwise we'll fault and then copy the buffer in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2172) * properly this next time through
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2173) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2174) if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2175) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2176) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2179) *sk_offset += sizeof(sh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2181) if (item_len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2182) char __user *up = ubuf + *sk_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2183) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2184) * Copy the item, same behavior as above, but reset the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2185) * * sk_offset so we copy the full thing again.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2186) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2187) if (read_extent_buffer_to_user_nofault(leaf, up,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2188) item_off, item_len)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2189) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2190) *sk_offset -= sizeof(sh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2191) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2194) *sk_offset += item_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2196) (*num_found)++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2198) if (ret) /* -EOVERFLOW from above */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2199) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2201) if (*num_found >= sk->nr_items) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2202) ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2203) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2206) advance_key:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2207) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2208) test.objectid = sk->max_objectid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2209) test.type = sk->max_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2210) test.offset = sk->max_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2211) if (btrfs_comp_cpu_keys(key, &test) >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2212) ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2213) else if (key->offset < (u64)-1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2214) key->offset++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2215) else if (key->type < (u8)-1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2216) key->offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2217) key->type++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2218) } else if (key->objectid < (u64)-1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2219) key->offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2220) key->type = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2221) key->objectid++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2222) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2223) ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2224) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2225) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2226) * 0: all items from this leaf copied, continue with next
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2227) * 1: * more items can be copied, but unused buffer is too small
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2228) * * all items were found
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2229) * Either way, it will stops the loop which iterates to the next
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2230) * leaf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2231) * -EOVERFLOW: item was to large for buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2232) * -EFAULT: could not copy extent buffer back to userspace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2233) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2234) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2237) static noinline int search_ioctl(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2238) struct btrfs_ioctl_search_key *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2239) size_t *buf_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2240) char __user *ubuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2242) struct btrfs_fs_info *info = btrfs_sb(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2243) struct btrfs_root *root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2244) struct btrfs_key key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2245) struct btrfs_path *path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2246) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2247) int num_found = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2248) unsigned long sk_offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2250) if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2251) *buf_size = sizeof(struct btrfs_ioctl_search_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2252) return -EOVERFLOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2255) path = btrfs_alloc_path();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2256) if (!path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2257) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2259) if (sk->tree_id == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2260) /* search the root of the inode that was passed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2261) root = btrfs_grab_root(BTRFS_I(inode)->root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2262) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2263) root = btrfs_get_fs_root(info, sk->tree_id, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2264) if (IS_ERR(root)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2265) btrfs_free_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2266) return PTR_ERR(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2270) key.objectid = sk->min_objectid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2271) key.type = sk->min_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2272) key.offset = sk->min_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2274) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2275) ret = fault_in_pages_writeable(ubuf + sk_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2276) *buf_size - sk_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2277) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2278) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2280) ret = btrfs_search_forward(root, &key, path, sk->min_transid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2281) if (ret != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2282) if (ret > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2283) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2284) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2286) ret = copy_to_sk(path, &key, sk, buf_size, ubuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2287) &sk_offset, &num_found);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2288) btrfs_release_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2289) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2290) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2292) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2293) if (ret > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2294) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2295) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2296) sk->nr_items = num_found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2297) btrfs_put_root(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2298) btrfs_free_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2299) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2302) static noinline int btrfs_ioctl_tree_search(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2303) void __user *argp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2304) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2305) struct btrfs_ioctl_search_args __user *uargs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2306) struct btrfs_ioctl_search_key sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2307) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2308) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2309) size_t buf_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2311) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2312) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2314) uargs = (struct btrfs_ioctl_search_args __user *)argp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2316) if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2317) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2319) buf_size = sizeof(uargs->buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2321) inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2322) ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2324) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2325) * In the origin implementation an overflow is handled by returning a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2326) * search header with a len of zero, so reset ret.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2327) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2328) if (ret == -EOVERFLOW)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2329) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2331) if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2332) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2333) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2334) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2336) static noinline int btrfs_ioctl_tree_search_v2(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2337) void __user *argp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2338) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2339) struct btrfs_ioctl_search_args_v2 __user *uarg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2340) struct btrfs_ioctl_search_args_v2 args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2341) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2342) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2343) size_t buf_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2344) const size_t buf_limit = SZ_16M;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2346) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2347) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2349) /* copy search header and buffer size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2350) uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2351) if (copy_from_user(&args, uarg, sizeof(args)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2352) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2354) buf_size = args.buf_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2356) /* limit result size to 16MB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2357) if (buf_size > buf_limit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2358) buf_size = buf_limit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2360) inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2361) ret = search_ioctl(inode, &args.key, &buf_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2362) (char __user *)(&uarg->buf[0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2363) if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2364) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2365) else if (ret == -EOVERFLOW &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2366) copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2367) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2369) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2370) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2372) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2373) * Search INODE_REFs to identify path name of 'dirid' directory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2374) * in a 'tree_id' tree. and sets path name to 'name'.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2375) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2376) static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2377) u64 tree_id, u64 dirid, char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2378) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2379) struct btrfs_root *root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2380) struct btrfs_key key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2381) char *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2382) int ret = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2383) int slot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2384) int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2385) int total_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2386) struct btrfs_inode_ref *iref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2387) struct extent_buffer *l;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2388) struct btrfs_path *path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2390) if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2391) name[0]='\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2392) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2393) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2395) path = btrfs_alloc_path();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2396) if (!path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2397) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2399) ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2401) root = btrfs_get_fs_root(info, tree_id, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2402) if (IS_ERR(root)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2403) ret = PTR_ERR(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2404) root = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2405) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2406) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2408) key.objectid = dirid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2409) key.type = BTRFS_INODE_REF_KEY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2410) key.offset = (u64)-1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2412) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2413) ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2414) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2415) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2416) else if (ret > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2417) ret = btrfs_previous_item(root, path, dirid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2418) BTRFS_INODE_REF_KEY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2419) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2420) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2421) else if (ret > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2422) ret = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2423) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2424) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2425) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2427) l = path->nodes[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2428) slot = path->slots[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2429) btrfs_item_key_to_cpu(l, &key, slot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2430)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2431) iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2432) len = btrfs_inode_ref_name_len(l, iref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2433) ptr -= len + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2434) total_len += len + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2435) if (ptr < name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2436) ret = -ENAMETOOLONG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2437) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2438) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2440) *(ptr + len) = '/';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2441) read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2443) if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2444) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2446) btrfs_release_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2447) key.objectid = key.offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2448) key.offset = (u64)-1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2449) dirid = key.objectid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2450) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2451) memmove(name, ptr, total_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2452) name[total_len] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2453) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2454) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2455) btrfs_put_root(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2456) btrfs_free_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2457) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2458) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2460) static int btrfs_search_path_in_tree_user(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2461) struct btrfs_ioctl_ino_lookup_user_args *args)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2462) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2463) struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2464) struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2465) struct btrfs_key upper_limit = BTRFS_I(inode)->location;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2466) u64 treeid = BTRFS_I(inode)->root->root_key.objectid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2467) u64 dirid = args->dirid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2468) unsigned long item_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2469) unsigned long item_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2470) struct btrfs_inode_ref *iref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2471) struct btrfs_root_ref *rref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2472) struct btrfs_root *root = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2473) struct btrfs_path *path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2474) struct btrfs_key key, key2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2475) struct extent_buffer *leaf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2476) struct inode *temp_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2477) char *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2478) int slot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2479) int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2480) int total_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2481) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2482)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2483) path = btrfs_alloc_path();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2484) if (!path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2485) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2487) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2488) * If the bottom subvolume does not exist directly under upper_limit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2489) * construct the path in from the bottom up.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2490) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2491) if (dirid != upper_limit.objectid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2492) ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2493)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2494) root = btrfs_get_fs_root(fs_info, treeid, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2495) if (IS_ERR(root)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2496) ret = PTR_ERR(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2497) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2498) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2500) key.objectid = dirid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2501) key.type = BTRFS_INODE_REF_KEY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2502) key.offset = (u64)-1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2503) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2504) ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2505) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2506) goto out_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2507) } else if (ret > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2508) ret = btrfs_previous_item(root, path, dirid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2509) BTRFS_INODE_REF_KEY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2510) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2511) goto out_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2512) } else if (ret > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2513) ret = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2514) goto out_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2515) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2516) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2518) leaf = path->nodes[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2519) slot = path->slots[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2520) btrfs_item_key_to_cpu(leaf, &key, slot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2521)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2522) iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2523) len = btrfs_inode_ref_name_len(leaf, iref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2524) ptr -= len + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2525) total_len += len + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2526) if (ptr < args->path) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2527) ret = -ENAMETOOLONG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2528) goto out_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2529) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2531) *(ptr + len) = '/';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2532) read_extent_buffer(leaf, ptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2533) (unsigned long)(iref + 1), len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2535) /* Check the read+exec permission of this directory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2536) ret = btrfs_previous_item(root, path, dirid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2537) BTRFS_INODE_ITEM_KEY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2538) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2539) goto out_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2540) } else if (ret > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2541) ret = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2542) goto out_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2543) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2544)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2545) leaf = path->nodes[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2546) slot = path->slots[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2547) btrfs_item_key_to_cpu(leaf, &key2, slot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2548) if (key2.objectid != dirid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2549) ret = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2550) goto out_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2551) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2553) temp_inode = btrfs_iget(sb, key2.objectid, root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2554) if (IS_ERR(temp_inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2555) ret = PTR_ERR(temp_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2556) goto out_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2557) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2558) ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2559) iput(temp_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2560) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2561) ret = -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2562) goto out_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2563) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2565) if (key.offset == upper_limit.objectid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2566) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2567) if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2568) ret = -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2569) goto out_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2570) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2572) btrfs_release_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2573) key.objectid = key.offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2574) key.offset = (u64)-1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2575) dirid = key.objectid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2576) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2577)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2578) memmove(args->path, ptr, total_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2579) args->path[total_len] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2580) btrfs_put_root(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2581) root = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2582) btrfs_release_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2583) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2584)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2585) /* Get the bottom subvolume's name from ROOT_REF */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2586) key.objectid = treeid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2587) key.type = BTRFS_ROOT_REF_KEY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2588) key.offset = args->treeid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2589) ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2590) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2591) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2592) } else if (ret > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2593) ret = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2594) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2595) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2597) leaf = path->nodes[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2598) slot = path->slots[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2599) btrfs_item_key_to_cpu(leaf, &key, slot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2600)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2601) item_off = btrfs_item_ptr_offset(leaf, slot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2602) item_len = btrfs_item_size_nr(leaf, slot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2603) /* Check if dirid in ROOT_REF corresponds to passed dirid */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2604) rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2605) if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2606) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2607) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2608) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2610) /* Copy subvolume's name */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2611) item_off += sizeof(struct btrfs_root_ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2612) item_len -= sizeof(struct btrfs_root_ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2613) read_extent_buffer(leaf, args->name, item_off, item_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2614) args->name[item_len] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2615)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2616) out_put:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2617) btrfs_put_root(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2618) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2619) btrfs_free_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2620) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2621) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2622)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2623) static noinline int btrfs_ioctl_ino_lookup(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2624) void __user *argp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2625) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2626) struct btrfs_ioctl_ino_lookup_args *args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2627) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2628) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2630) args = memdup_user(argp, sizeof(*args));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2631) if (IS_ERR(args))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2632) return PTR_ERR(args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2634) inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2635)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2636) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2637) * Unprivileged query to obtain the containing subvolume root id. The
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2638) * path is reset so it's consistent with btrfs_search_path_in_tree.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2639) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2640) if (args->treeid == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2641) args->treeid = BTRFS_I(inode)->root->root_key.objectid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2642)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2643) if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2644) args->name[0] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2645) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2646) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2647)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2648) if (!capable(CAP_SYS_ADMIN)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2649) ret = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2650) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2651) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2652)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2653) ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2654) args->treeid, args->objectid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2655) args->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2656)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2657) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2658) if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2659) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2660)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2661) kfree(args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2662) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2663) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2664)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2665) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2666) * Version of ino_lookup ioctl (unprivileged)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2667) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2668) * The main differences from ino_lookup ioctl are:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2669) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2670) * 1. Read + Exec permission will be checked using inode_permission() during
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2671) * path construction. -EACCES will be returned in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2672) * 2. Path construction will be stopped at the inode number which corresponds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2673) * to the fd with which this ioctl is called. If constructed path does not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2674) * exist under fd's inode, -EACCES will be returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2675) * 3. The name of bottom subvolume is also searched and filled.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2676) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2677) static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2678) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2679) struct btrfs_ioctl_ino_lookup_user_args *args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2680) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2681) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2682)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2683) args = memdup_user(argp, sizeof(*args));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2684) if (IS_ERR(args))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2685) return PTR_ERR(args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2686)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2687) inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2688)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2689) if (args->dirid == BTRFS_FIRST_FREE_OBJECTID &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2690) BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2691) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2692) * The subvolume does not exist under fd with which this is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2693) * called
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2694) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2695) kfree(args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2696) return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2697) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2698)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2699) ret = btrfs_search_path_in_tree_user(inode, args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2700)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2701) if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2702) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2703)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2704) kfree(args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2705) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2706) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2707)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2708) /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2709) static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2710) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2711) struct btrfs_ioctl_get_subvol_info_args *subvol_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2712) struct btrfs_fs_info *fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2713) struct btrfs_root *root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2714) struct btrfs_path *path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2715) struct btrfs_key key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2716) struct btrfs_root_item *root_item;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2717) struct btrfs_root_ref *rref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2718) struct extent_buffer *leaf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2719) unsigned long item_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2720) unsigned long item_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2721) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2722) int slot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2723) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2724)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2725) path = btrfs_alloc_path();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2726) if (!path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2727) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2728)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2729) subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2730) if (!subvol_info) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2731) btrfs_free_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2732) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2733) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2734)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2735) inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2736) fs_info = BTRFS_I(inode)->root->fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2737)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2738) /* Get root_item of inode's subvolume */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2739) key.objectid = BTRFS_I(inode)->root->root_key.objectid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2740) root = btrfs_get_fs_root(fs_info, key.objectid, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2741) if (IS_ERR(root)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2742) ret = PTR_ERR(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2743) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2744) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2745) root_item = &root->root_item;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2747) subvol_info->treeid = key.objectid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2748)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2749) subvol_info->generation = btrfs_root_generation(root_item);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2750) subvol_info->flags = btrfs_root_flags(root_item);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2751)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2752) memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2753) memcpy(subvol_info->parent_uuid, root_item->parent_uuid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2754) BTRFS_UUID_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2755) memcpy(subvol_info->received_uuid, root_item->received_uuid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2756) BTRFS_UUID_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2757)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2758) subvol_info->ctransid = btrfs_root_ctransid(root_item);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2759) subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2760) subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2761)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2762) subvol_info->otransid = btrfs_root_otransid(root_item);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2763) subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2764) subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2765)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2766) subvol_info->stransid = btrfs_root_stransid(root_item);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2767) subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2768) subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2769)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2770) subvol_info->rtransid = btrfs_root_rtransid(root_item);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2771) subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2772) subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2773)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2774) if (key.objectid != BTRFS_FS_TREE_OBJECTID) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2775) /* Search root tree for ROOT_BACKREF of this subvolume */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2776) key.type = BTRFS_ROOT_BACKREF_KEY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2777) key.offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2778) ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2779) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2780) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2781) } else if (path->slots[0] >=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2782) btrfs_header_nritems(path->nodes[0])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2783) ret = btrfs_next_leaf(fs_info->tree_root, path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2784) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2785) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2786) } else if (ret > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2787) ret = -EUCLEAN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2788) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2789) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2790) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2791)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2792) leaf = path->nodes[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2793) slot = path->slots[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2794) btrfs_item_key_to_cpu(leaf, &key, slot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2795) if (key.objectid == subvol_info->treeid &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2796) key.type == BTRFS_ROOT_BACKREF_KEY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2797) subvol_info->parent_id = key.offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2798)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2799) rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2800) subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2801)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2802) item_off = btrfs_item_ptr_offset(leaf, slot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2803) + sizeof(struct btrfs_root_ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2804) item_len = btrfs_item_size_nr(leaf, slot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2805) - sizeof(struct btrfs_root_ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2806) read_extent_buffer(leaf, subvol_info->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2807) item_off, item_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2808) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2809) ret = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2810) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2811) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2812) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2813)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2814) if (copy_to_user(argp, subvol_info, sizeof(*subvol_info)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2815) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2816)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2817) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2818) btrfs_put_root(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2819) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2820) btrfs_free_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2821) kfree(subvol_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2822) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2823) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2824)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2825) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2826) * Return ROOT_REF information of the subvolume containing this inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2827) * except the subvolume name.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2828) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2829) static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2830) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2831) struct btrfs_ioctl_get_subvol_rootref_args *rootrefs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2832) struct btrfs_root_ref *rref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2833) struct btrfs_root *root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2834) struct btrfs_path *path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2835) struct btrfs_key key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2836) struct extent_buffer *leaf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2837) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2838) u64 objectid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2839) int slot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2840) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2841) u8 found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2842)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2843) path = btrfs_alloc_path();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2844) if (!path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2845) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2846)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2847) rootrefs = memdup_user(argp, sizeof(*rootrefs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2848) if (IS_ERR(rootrefs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2849) btrfs_free_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2850) return PTR_ERR(rootrefs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2851) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2852)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2853) inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2854) root = BTRFS_I(inode)->root->fs_info->tree_root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2855) objectid = BTRFS_I(inode)->root->root_key.objectid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2856)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2857) key.objectid = objectid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2858) key.type = BTRFS_ROOT_REF_KEY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2859) key.offset = rootrefs->min_treeid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2860) found = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2861)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2862) ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2863) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2864) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2865) } else if (path->slots[0] >=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2866) btrfs_header_nritems(path->nodes[0])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2867) ret = btrfs_next_leaf(root, path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2868) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2869) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2870) } else if (ret > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2871) ret = -EUCLEAN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2872) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2873) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2874) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2875) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2876) leaf = path->nodes[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2877) slot = path->slots[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2878)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2879) btrfs_item_key_to_cpu(leaf, &key, slot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2880) if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2881) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2882) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2883) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2884)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2885) if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2886) ret = -EOVERFLOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2887) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2888) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2889)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2890) rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2891) rootrefs->rootref[found].treeid = key.offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2892) rootrefs->rootref[found].dirid =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2893) btrfs_root_ref_dirid(leaf, rref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2894) found++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2895)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2896) ret = btrfs_next_item(root, path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2897) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2898) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2899) } else if (ret > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2900) ret = -EUCLEAN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2901) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2902) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2903) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2904)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2905) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2906) if (!ret || ret == -EOVERFLOW) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2907) rootrefs->num_items = found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2908) /* update min_treeid for next search */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2909) if (found)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2910) rootrefs->min_treeid =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2911) rootrefs->rootref[found - 1].treeid + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2912) if (copy_to_user(argp, rootrefs, sizeof(*rootrefs)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2913) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2914) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2915)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2916) kfree(rootrefs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2917) btrfs_free_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2918)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2919) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2920) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2921)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2922) static noinline int btrfs_ioctl_snap_destroy(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2923) void __user *arg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2924) bool destroy_v2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2925) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2926) struct dentry *parent = file->f_path.dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2927) struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2928) struct dentry *dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2929) struct inode *dir = d_inode(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2930) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2931) struct btrfs_root *root = BTRFS_I(dir)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2932) struct btrfs_root *dest = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2933) struct btrfs_ioctl_vol_args *vol_args = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2934) struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2935) char *subvol_name, *subvol_name_ptr = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2936) int subvol_namelen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2937) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2938) bool destroy_parent = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2939)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2940) if (destroy_v2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2941) vol_args2 = memdup_user(arg, sizeof(*vol_args2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2942) if (IS_ERR(vol_args2))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2943) return PTR_ERR(vol_args2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2944)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2945) if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2946) err = -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2947) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2948) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2949)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2950) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2951) * If SPEC_BY_ID is not set, we are looking for the subvolume by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2952) * name, same as v1 currently does.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2953) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2954) if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2955) vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2956) subvol_name = vol_args2->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2957)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2958) err = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2959) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2960) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2961) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2962) if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2963) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2964) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2965) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2966)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2967) err = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2968) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2969) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2970)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2971) dentry = btrfs_get_dentry(fs_info->sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2972) BTRFS_FIRST_FREE_OBJECTID,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2973) vol_args2->subvolid, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2974) if (IS_ERR(dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2975) err = PTR_ERR(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2976) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2977) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2978)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2979) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2980) * Change the default parent since the subvolume being
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2981) * deleted can be outside of the current mount point.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2982) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2983) parent = btrfs_get_parent(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2984)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2985) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2986) * At this point dentry->d_name can point to '/' if the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2987) * subvolume we want to destroy is outsite of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2988) * current mount point, so we need to release the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2989) * current dentry and execute the lookup to return a new
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2990) * one with ->d_name pointing to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2991) * <mount point>/subvol_name.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2992) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2993) dput(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2994) if (IS_ERR(parent)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2995) err = PTR_ERR(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2996) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2997) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2998) dir = d_inode(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2999)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3000) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3001) * If v2 was used with SPEC_BY_ID, a new parent was
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3002) * allocated since the subvolume can be outside of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3003) * current mount point. Later on we need to release this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3004) * new parent dentry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3005) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3006) destroy_parent = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3007)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3008) subvol_name_ptr = btrfs_get_subvol_name_from_objectid(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3009) fs_info, vol_args2->subvolid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3010) if (IS_ERR(subvol_name_ptr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3011) err = PTR_ERR(subvol_name_ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3012) goto free_parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3013) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3014) /* subvol_name_ptr is already NULL termined */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3015) subvol_name = (char *)kbasename(subvol_name_ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3016) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3017) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3018) vol_args = memdup_user(arg, sizeof(*vol_args));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3019) if (IS_ERR(vol_args))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3020) return PTR_ERR(vol_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3021)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3022) vol_args->name[BTRFS_PATH_NAME_MAX] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3023) subvol_name = vol_args->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3024)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3025) err = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3026) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3027) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3028) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3029)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3030) subvol_namelen = strlen(subvol_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3031)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3032) if (strchr(subvol_name, '/') ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3033) strncmp(subvol_name, "..", subvol_namelen) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3034) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3035) goto free_subvol_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3036) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3037)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3038) if (!S_ISDIR(dir->i_mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3039) err = -ENOTDIR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3040) goto free_subvol_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3041) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3042)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3043) err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3044) if (err == -EINTR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3045) goto free_subvol_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3046) dentry = lookup_one_len(subvol_name, parent, subvol_namelen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3047) if (IS_ERR(dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3048) err = PTR_ERR(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3049) goto out_unlock_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3050) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3051)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3052) if (d_really_is_negative(dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3053) err = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3054) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3055) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3056)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3057) inode = d_inode(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3058) dest = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3059) if (!capable(CAP_SYS_ADMIN)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3060) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3061) * Regular user. Only allow this with a special mount
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3062) * option, when the user has write+exec access to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3063) * subvol root, and when rmdir(2) would have been
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3064) * allowed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3065) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3066) * Note that this is _not_ check that the subvol is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3067) * empty or doesn't contain data that we wouldn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3068) * otherwise be able to delete.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3069) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3070) * Users who want to delete empty subvols should try
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3071) * rmdir(2).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3072) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3073) err = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3074) if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3075) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3076)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3077) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3078) * Do not allow deletion if the parent dir is the same
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3079) * as the dir to be deleted. That means the ioctl
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3080) * must be called on the dentry referencing the root
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3081) * of the subvol, not a random directory contained
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3082) * within it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3083) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3084) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3085) if (root == dest)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3086) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3087)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3088) err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3089) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3090) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3091) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3092)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3093) /* check if subvolume may be deleted by a user */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3094) err = btrfs_may_delete(dir, dentry, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3095) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3096) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3097)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3098) if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3099) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3100) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3103) inode_lock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3104) err = btrfs_delete_subvolume(dir, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3105) inode_unlock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3106) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3107) d_delete_notify(dir, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3109) out_dput:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3110) dput(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3111) out_unlock_dir:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3112) inode_unlock(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3113) free_subvol_name:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3114) kfree(subvol_name_ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3115) free_parent:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3116) if (destroy_parent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3117) dput(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3118) out_drop_write:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3119) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3120) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3121) kfree(vol_args2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3122) kfree(vol_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3123) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3126) static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3128) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3129) struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3130) struct btrfs_ioctl_defrag_range_args *range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3131) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3133) ret = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3134) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3135) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3137) if (btrfs_root_readonly(root)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3138) ret = -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3139) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3142) switch (inode->i_mode & S_IFMT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3143) case S_IFDIR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3144) if (!capable(CAP_SYS_ADMIN)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3145) ret = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3146) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3147) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3148) ret = btrfs_defrag_root(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3149) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3150) case S_IFREG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3151) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3152) * Note that this does not check the file descriptor for write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3153) * access. This prevents defragmenting executables that are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3154) * running and allows defrag on files open in read-only mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3155) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3156) if (!capable(CAP_SYS_ADMIN) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3157) inode_permission(inode, MAY_WRITE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3158) ret = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3159) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3162) range = kzalloc(sizeof(*range), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3163) if (!range) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3164) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3165) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3168) if (argp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3169) if (copy_from_user(range, argp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3170) sizeof(*range))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3171) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3172) kfree(range);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3173) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3175) /* compression requires us to start the IO */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3176) if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3177) range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3178) range->extent_thresh = (u32)-1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3180) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3181) /* the rest are all set to zero by kzalloc */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3182) range->len = (u64)-1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3184) ret = btrfs_defrag_file(file_inode(file), file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3185) range, BTRFS_OLDEST_GENERATION, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3186) if (ret > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3187) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3188) kfree(range);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3189) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3190) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3191) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3193) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3194) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3195) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3198) static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3200) struct btrfs_ioctl_vol_args *vol_args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3201) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3203) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3204) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3206) if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3207) return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3209) vol_args = memdup_user(arg, sizeof(*vol_args));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3210) if (IS_ERR(vol_args)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3211) ret = PTR_ERR(vol_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3212) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3215) vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3216) ret = btrfs_init_new_device(fs_info, vol_args->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3218) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3219) btrfs_info(fs_info, "disk added %s", vol_args->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3221) kfree(vol_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3222) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3223) btrfs_exclop_finish(fs_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3224) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3227) static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3228) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3229) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3230) struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3231) struct btrfs_ioctl_vol_args_v2 *vol_args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3232) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3234) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3235) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3237) ret = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3238) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3239) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3241) vol_args = memdup_user(arg, sizeof(*vol_args));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3242) if (IS_ERR(vol_args)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3243) ret = PTR_ERR(vol_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3244) goto err_drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3245) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3247) if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3248) ret = -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3249) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3250) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3252) if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3253) ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3254) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3255) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3257) if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3258) ret = btrfs_rm_device(fs_info, NULL, vol_args->devid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3259) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3260) vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3261) ret = btrfs_rm_device(fs_info, vol_args->name, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3263) btrfs_exclop_finish(fs_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3265) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3266) if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3267) btrfs_info(fs_info, "device deleted: id %llu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3268) vol_args->devid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3269) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3270) btrfs_info(fs_info, "device deleted: %s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3271) vol_args->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3272) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3273) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3274) kfree(vol_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3275) err_drop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3276) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3277) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3280) static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3281) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3282) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3283) struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3284) struct btrfs_ioctl_vol_args *vol_args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3285) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3287) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3288) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3290) ret = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3291) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3292) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3294) if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3295) ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3296) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3299) vol_args = memdup_user(arg, sizeof(*vol_args));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3300) if (IS_ERR(vol_args)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3301) ret = PTR_ERR(vol_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3302) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3305) vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3306) ret = btrfs_rm_device(fs_info, vol_args->name, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3308) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3309) btrfs_info(fs_info, "disk deleted %s", vol_args->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3310) kfree(vol_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3311) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3312) btrfs_exclop_finish(fs_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3313) out_drop_write:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3314) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3316) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3319) static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3320) void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3321) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3322) struct btrfs_ioctl_fs_info_args *fi_args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3323) struct btrfs_device *device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3324) struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3325) u64 flags_in;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3326) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3328) fi_args = memdup_user(arg, sizeof(*fi_args));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3329) if (IS_ERR(fi_args))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3330) return PTR_ERR(fi_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3332) flags_in = fi_args->flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3333) memset(fi_args, 0, sizeof(*fi_args));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3335) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3336) fi_args->num_devices = fs_devices->num_devices;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3338) list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3339) if (device->devid > fi_args->max_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3340) fi_args->max_id = device->devid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3341) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3342) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3344) memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3345) fi_args->nodesize = fs_info->nodesize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3346) fi_args->sectorsize = fs_info->sectorsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3347) fi_args->clone_alignment = fs_info->sectorsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3349) if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3350) fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3351) fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3352) fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3353) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3355) if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3356) fi_args->generation = fs_info->generation;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3357) fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3360) if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3361) memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3362) sizeof(fi_args->metadata_uuid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3363) fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3364) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3366) if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3367) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3369) kfree(fi_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3370) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3371) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3373) static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3374) void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3375) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3376) struct btrfs_ioctl_dev_info_args *di_args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3377) struct btrfs_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3378) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3379) char *s_uuid = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3381) di_args = memdup_user(arg, sizeof(*di_args));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3382) if (IS_ERR(di_args))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3383) return PTR_ERR(di_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3385) if (!btrfs_is_empty_uuid(di_args->uuid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3386) s_uuid = di_args->uuid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3388) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3389) dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3390) NULL, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3392) if (!dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3393) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3394) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3397) di_args->devid = dev->devid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3398) di_args->bytes_used = btrfs_device_get_bytes_used(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3399) di_args->total_bytes = btrfs_device_get_total_bytes(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3400) memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3401) if (dev->name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3402) strncpy(di_args->path, rcu_str_deref(dev->name),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3403) sizeof(di_args->path) - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3404) di_args->path[sizeof(di_args->path) - 1] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3405) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3406) di_args->path[0] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3407) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3409) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3410) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3411) if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3412) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3414) kfree(di_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3415) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3416) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3418) static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3419) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3420) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3421) struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3422) struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3423) struct btrfs_root *new_root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3424) struct btrfs_dir_item *di;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3425) struct btrfs_trans_handle *trans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3426) struct btrfs_path *path = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3427) struct btrfs_disk_key disk_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3428) u64 objectid = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3429) u64 dir_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3430) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3432) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3433) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3434)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3435) ret = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3436) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3437) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3439) if (copy_from_user(&objectid, argp, sizeof(objectid))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3440) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3441) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3442) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3444) if (!objectid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3445) objectid = BTRFS_FS_TREE_OBJECTID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3446)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3447) new_root = btrfs_get_fs_root(fs_info, objectid, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3448) if (IS_ERR(new_root)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3449) ret = PTR_ERR(new_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3450) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3451) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3452) if (!is_fstree(new_root->root_key.objectid)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3453) ret = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3454) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3455) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3457) path = btrfs_alloc_path();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3458) if (!path) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3459) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3460) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3461) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3462) path->leave_spinning = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3464) trans = btrfs_start_transaction(root, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3465) if (IS_ERR(trans)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3466) ret = PTR_ERR(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3467) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3468) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3470) dir_id = btrfs_super_root_dir(fs_info->super_copy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3471) di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3472) dir_id, "default", 7, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3473) if (IS_ERR_OR_NULL(di)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3474) btrfs_release_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3475) btrfs_end_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3476) btrfs_err(fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3477) "Umm, you don't have the default diritem, this isn't going to work");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3478) ret = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3479) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3480) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3482) btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3483) btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3484) btrfs_mark_buffer_dirty(path->nodes[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3485) btrfs_release_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3487) btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3488) btrfs_end_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3489) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3490) btrfs_put_root(new_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3491) btrfs_free_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3492) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3493) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3494) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3495) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3496)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3497) static void get_block_group_info(struct list_head *groups_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3498) struct btrfs_ioctl_space_info *space)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3499) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3500) struct btrfs_block_group *block_group;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3502) space->total_bytes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3503) space->used_bytes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3504) space->flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3505) list_for_each_entry(block_group, groups_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3506) space->flags = block_group->flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3507) space->total_bytes += block_group->length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3508) space->used_bytes += block_group->used;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3509) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3510) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3511)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3512) static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3513) void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3514) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3515) struct btrfs_ioctl_space_args space_args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3516) struct btrfs_ioctl_space_info space;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3517) struct btrfs_ioctl_space_info *dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3518) struct btrfs_ioctl_space_info *dest_orig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3519) struct btrfs_ioctl_space_info __user *user_dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3520) struct btrfs_space_info *info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3521) static const u64 types[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3522) BTRFS_BLOCK_GROUP_DATA,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3523) BTRFS_BLOCK_GROUP_SYSTEM,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3524) BTRFS_BLOCK_GROUP_METADATA,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3525) BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3526) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3527) int num_types = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3528) int alloc_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3529) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3530) u64 slot_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3531) int i, c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3533) if (copy_from_user(&space_args,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3534) (struct btrfs_ioctl_space_args __user *)arg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3535) sizeof(space_args)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3536) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3538) for (i = 0; i < num_types; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3539) struct btrfs_space_info *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3540)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3541) info = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3542) list_for_each_entry(tmp, &fs_info->space_info, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3543) if (tmp->flags == types[i]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3544) info = tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3545) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3546) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3547) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3549) if (!info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3550) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3551)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3552) down_read(&info->groups_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3553) for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3554) if (!list_empty(&info->block_groups[c]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3555) slot_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3556) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3557) up_read(&info->groups_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3558) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3560) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3561) * Global block reserve, exported as a space_info
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3562) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3563) slot_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3565) /* space_slots == 0 means they are asking for a count */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3566) if (space_args.space_slots == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3567) space_args.total_spaces = slot_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3568) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3569) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3571) slot_count = min_t(u64, space_args.space_slots, slot_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3572)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3573) alloc_size = sizeof(*dest) * slot_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3575) /* we generally have at most 6 or so space infos, one for each raid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3576) * level. So, a whole page should be more than enough for everyone
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3577) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3578) if (alloc_size > PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3579) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3581) space_args.total_spaces = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3582) dest = kmalloc(alloc_size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3583) if (!dest)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3584) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3585) dest_orig = dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3586)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3587) /* now we have a buffer to copy into */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3588) for (i = 0; i < num_types; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3589) struct btrfs_space_info *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3590)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3591) if (!slot_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3592) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3594) info = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3595) list_for_each_entry(tmp, &fs_info->space_info, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3596) if (tmp->flags == types[i]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3597) info = tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3598) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3599) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3600) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3601)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3602) if (!info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3603) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3604) down_read(&info->groups_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3605) for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3606) if (!list_empty(&info->block_groups[c])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3607) get_block_group_info(&info->block_groups[c],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3608) &space);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3609) memcpy(dest, &space, sizeof(space));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3610) dest++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3611) space_args.total_spaces++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3612) slot_count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3613) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3614) if (!slot_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3615) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3616) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3617) up_read(&info->groups_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3618) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3619)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3620) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3621) * Add global block reserve
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3622) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3623) if (slot_count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3624) struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3625)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3626) spin_lock(&block_rsv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3627) space.total_bytes = block_rsv->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3628) space.used_bytes = block_rsv->size - block_rsv->reserved;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3629) spin_unlock(&block_rsv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3630) space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3631) memcpy(dest, &space, sizeof(space));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3632) space_args.total_spaces++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3633) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3634)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3635) user_dest = (struct btrfs_ioctl_space_info __user *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3636) (arg + sizeof(struct btrfs_ioctl_space_args));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3638) if (copy_to_user(user_dest, dest_orig, alloc_size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3639) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3641) kfree(dest_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3642) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3643) if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3644) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3645)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3646) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3647) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3648)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3649) static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3650) void __user *argp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3651) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3652) struct btrfs_trans_handle *trans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3653) u64 transid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3654) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3655)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3656) trans = btrfs_attach_transaction_barrier(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3657) if (IS_ERR(trans)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3658) if (PTR_ERR(trans) != -ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3659) return PTR_ERR(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3660)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3661) /* No running transaction, don't bother */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3662) transid = root->fs_info->last_trans_committed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3663) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3664) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3665) transid = trans->transid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3666) ret = btrfs_commit_transaction_async(trans, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3667) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3668) btrfs_end_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3669) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3670) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3671) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3672) if (argp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3673) if (copy_to_user(argp, &transid, sizeof(transid)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3674) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3675) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3676) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3678) static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3679) void __user *argp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3680) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3681) u64 transid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3682)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3683) if (argp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3684) if (copy_from_user(&transid, argp, sizeof(transid)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3685) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3686) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3687) transid = 0; /* current trans */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3688) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3689) return btrfs_wait_for_commit(fs_info, transid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3690) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3691)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3692) static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3693) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3694) struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3695) struct btrfs_ioctl_scrub_args *sa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3696) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3697)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3698) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3699) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3700)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3701) sa = memdup_user(arg, sizeof(*sa));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3702) if (IS_ERR(sa))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3703) return PTR_ERR(sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3704)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3705) if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3706) ret = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3707) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3708) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3709) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3710)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3711) ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3712) &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3713) 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3714)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3715) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3716) * Copy scrub args to user space even if btrfs_scrub_dev() returned an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3717) * error. This is important as it allows user space to know how much
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3718) * progress scrub has done. For example, if scrub is canceled we get
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3719) * -ECANCELED from btrfs_scrub_dev() and return that error back to user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3720) * space. Later user space can inspect the progress from the structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3721) * btrfs_ioctl_scrub_args and resume scrub from where it left off
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3722) * previously (btrfs-progs does this).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3723) * If we fail to copy the btrfs_ioctl_scrub_args structure to user space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3724) * then return -EFAULT to signal the structure was not copied or it may
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3725) * be corrupt and unreliable due to a partial copy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3726) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3727) if (copy_to_user(arg, sa, sizeof(*sa)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3728) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3729)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3730) if (!(sa->flags & BTRFS_SCRUB_READONLY))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3731) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3732) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3733) kfree(sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3734) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3735) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3736)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3737) static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3738) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3739) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3740) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3741)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3742) return btrfs_scrub_cancel(fs_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3743) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3744)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3745) static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3746) void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3747) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3748) struct btrfs_ioctl_scrub_args *sa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3749) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3750)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3751) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3752) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3753)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3754) sa = memdup_user(arg, sizeof(*sa));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3755) if (IS_ERR(sa))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3756) return PTR_ERR(sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3757)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3758) ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3759)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3760) if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3761) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3762)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3763) kfree(sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3764) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3765) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3766)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3767) static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3768) void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3769) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3770) struct btrfs_ioctl_get_dev_stats *sa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3771) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3772)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3773) sa = memdup_user(arg, sizeof(*sa));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3774) if (IS_ERR(sa))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3775) return PTR_ERR(sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3776)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3777) if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3778) kfree(sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3779) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3780) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3781)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3782) ret = btrfs_get_dev_stats(fs_info, sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3783)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3784) if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3785) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3786)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3787) kfree(sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3788) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3789) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3790)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3791) static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3792) void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3793) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3794) struct btrfs_ioctl_dev_replace_args *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3795) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3796)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3797) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3798) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3799)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3800) p = memdup_user(arg, sizeof(*p));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3801) if (IS_ERR(p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3802) return PTR_ERR(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3803)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3804) switch (p->cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3805) case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3806) if (sb_rdonly(fs_info->sb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3807) ret = -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3808) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3809) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3810) if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3811) ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3812) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3813) ret = btrfs_dev_replace_by_ioctl(fs_info, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3814) btrfs_exclop_finish(fs_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3815) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3816) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3817) case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3818) btrfs_dev_replace_status(fs_info, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3819) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3820) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3821) case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3822) p->result = btrfs_dev_replace_cancel(fs_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3823) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3824) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3825) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3826) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3827) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3828) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3829)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3830) if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3831) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3832) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3833) kfree(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3834) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3835) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3836)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3837) static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3838) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3839) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3840) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3841) u64 rel_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3842) int size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3843) struct btrfs_ioctl_ino_path_args *ipa = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3844) struct inode_fs_paths *ipath = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3845) struct btrfs_path *path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3846)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3847) if (!capable(CAP_DAC_READ_SEARCH))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3848) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3849)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3850) path = btrfs_alloc_path();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3851) if (!path) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3852) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3853) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3854) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3855)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3856) ipa = memdup_user(arg, sizeof(*ipa));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3857) if (IS_ERR(ipa)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3858) ret = PTR_ERR(ipa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3859) ipa = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3860) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3861) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3862)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3863) size = min_t(u32, ipa->size, 4096);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3864) ipath = init_ipath(size, root, path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3865) if (IS_ERR(ipath)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3866) ret = PTR_ERR(ipath);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3867) ipath = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3868) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3869) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3870)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3871) ret = paths_from_inode(ipa->inum, ipath);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3872) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3873) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3874)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3875) for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3876) rel_ptr = ipath->fspath->val[i] -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3877) (u64)(unsigned long)ipath->fspath->val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3878) ipath->fspath->val[i] = rel_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3879) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3880)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3881) ret = copy_to_user((void __user *)(unsigned long)ipa->fspath,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3882) ipath->fspath, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3883) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3884) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3885) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3886) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3887)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3888) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3889) btrfs_free_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3890) free_ipath(ipath);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3891) kfree(ipa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3892)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3893) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3894) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3895)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3896) static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3897) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3898) struct btrfs_data_container *inodes = ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3899) const size_t c = 3 * sizeof(u64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3900)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3901) if (inodes->bytes_left >= c) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3902) inodes->bytes_left -= c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3903) inodes->val[inodes->elem_cnt] = inum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3904) inodes->val[inodes->elem_cnt + 1] = offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3905) inodes->val[inodes->elem_cnt + 2] = root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3906) inodes->elem_cnt += 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3907) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3908) inodes->bytes_missing += c - inodes->bytes_left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3909) inodes->bytes_left = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3910) inodes->elem_missed += 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3911) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3912)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3913) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3914) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3915)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3916) static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3917) void __user *arg, int version)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3918) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3919) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3920) int size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3921) struct btrfs_ioctl_logical_ino_args *loi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3922) struct btrfs_data_container *inodes = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3923) struct btrfs_path *path = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3924) bool ignore_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3925)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3926) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3927) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3928)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3929) loi = memdup_user(arg, sizeof(*loi));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3930) if (IS_ERR(loi))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3931) return PTR_ERR(loi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3932)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3933) if (version == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3934) ignore_offset = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3935) size = min_t(u32, loi->size, SZ_64K);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3936) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3937) /* All reserved bits must be 0 for now */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3938) if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3939) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3940) goto out_loi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3941) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3942) /* Only accept flags we have defined so far */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3943) if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3944) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3945) goto out_loi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3946) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3947) ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3948) size = min_t(u32, loi->size, SZ_16M);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3949) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3950)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3951) path = btrfs_alloc_path();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3952) if (!path) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3953) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3954) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3955) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3956)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3957) inodes = init_data_container(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3958) if (IS_ERR(inodes)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3959) ret = PTR_ERR(inodes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3960) inodes = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3961) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3962) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3963)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3964) ret = iterate_inodes_from_logical(loi->logical, fs_info, path,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3965) build_ino_list, inodes, ignore_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3966) if (ret == -EINVAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3967) ret = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3968) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3969) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3970)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3971) ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3972) size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3973) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3974) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3975)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3976) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3977) btrfs_free_path(path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3978) kvfree(inodes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3979) out_loi:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3980) kfree(loi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3981)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3982) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3983) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3984)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3985) void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3986) struct btrfs_ioctl_balance_args *bargs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3987) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3988) struct btrfs_balance_control *bctl = fs_info->balance_ctl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3989)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3990) bargs->flags = bctl->flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3991)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3992) if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3993) bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3994) if (atomic_read(&fs_info->balance_pause_req))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3995) bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3996) if (atomic_read(&fs_info->balance_cancel_req))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3997) bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3998)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3999) memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4000) memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4001) memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4002)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4003) spin_lock(&fs_info->balance_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4004) memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4005) spin_unlock(&fs_info->balance_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4006) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4007)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4008) static long btrfs_ioctl_balance(struct file *file, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4009) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4010) struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4011) struct btrfs_fs_info *fs_info = root->fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4012) struct btrfs_ioctl_balance_args *bargs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4013) struct btrfs_balance_control *bctl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4014) bool need_unlock; /* for mut. excl. ops lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4015) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4016)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4017) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4018) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4019)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4020) ret = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4021) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4022) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4023)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4024) again:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4025) if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4026) mutex_lock(&fs_info->balance_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4027) need_unlock = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4028) goto locked;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4029) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4030)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4031) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4032) * mut. excl. ops lock is locked. Three possibilities:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4033) * (1) some other op is running
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4034) * (2) balance is running
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4035) * (3) balance is paused -- special case (think resume)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4036) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4037) mutex_lock(&fs_info->balance_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4038) if (fs_info->balance_ctl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4039) /* this is either (2) or (3) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4040) if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4041) mutex_unlock(&fs_info->balance_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4042) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4043) * Lock released to allow other waiters to continue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4044) * we'll reexamine the status again.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4045) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4046) mutex_lock(&fs_info->balance_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4047)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4048) if (fs_info->balance_ctl &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4049) !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4050) /* this is (3) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4051) need_unlock = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4052) goto locked;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4053) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4054)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4055) mutex_unlock(&fs_info->balance_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4056) goto again;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4057) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4058) /* this is (2) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4059) mutex_unlock(&fs_info->balance_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4060) ret = -EINPROGRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4061) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4062) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4063) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4064) /* this is (1) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4065) mutex_unlock(&fs_info->balance_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4066) ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4067) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4068) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4069)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4070) locked:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4071)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4072) if (arg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4073) bargs = memdup_user(arg, sizeof(*bargs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4074) if (IS_ERR(bargs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4075) ret = PTR_ERR(bargs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4076) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4077) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4078)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4079) if (bargs->flags & BTRFS_BALANCE_RESUME) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4080) if (!fs_info->balance_ctl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4081) ret = -ENOTCONN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4082) goto out_bargs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4083) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4084)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4085) bctl = fs_info->balance_ctl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4086) spin_lock(&fs_info->balance_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4087) bctl->flags |= BTRFS_BALANCE_RESUME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4088) spin_unlock(&fs_info->balance_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4089)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4090) goto do_balance;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4091) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4092) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4093) bargs = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4094) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4095)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4096) if (fs_info->balance_ctl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4097) ret = -EINPROGRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4098) goto out_bargs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4099) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4101) bctl = kzalloc(sizeof(*bctl), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4102) if (!bctl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4103) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4104) goto out_bargs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4107) if (arg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4108) memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4109) memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4110) memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4112) bctl->flags = bargs->flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4113) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4114) /* balance everything - no filters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4115) bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4118) if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4119) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4120) goto out_bctl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4123) do_balance:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4124) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4125) * Ownership of bctl and exclusive operation goes to btrfs_balance.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4126) * bctl is freed in reset_balance_state, or, if restriper was paused
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4127) * all the way until unmount, in free_fs_info. The flag should be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4128) * cleared after reset_balance_state.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4129) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4130) need_unlock = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4132) ret = btrfs_balance(fs_info, bctl, bargs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4133) bctl = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4135) if ((ret == 0 || ret == -ECANCELED) && arg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4136) if (copy_to_user(arg, bargs, sizeof(*bargs)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4137) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4140) out_bctl:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4141) kfree(bctl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4142) out_bargs:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4143) kfree(bargs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4144) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4145) mutex_unlock(&fs_info->balance_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4146) if (need_unlock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4147) btrfs_exclop_finish(fs_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4148) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4149) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4150) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4153) static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4155) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4156) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4158) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4159) case BTRFS_BALANCE_CTL_PAUSE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4160) return btrfs_pause_balance(fs_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4161) case BTRFS_BALANCE_CTL_CANCEL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4162) return btrfs_cancel_balance(fs_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4165) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4168) static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4169) void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4170) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4171) struct btrfs_ioctl_balance_args *bargs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4172) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4174) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4175) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4177) mutex_lock(&fs_info->balance_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4178) if (!fs_info->balance_ctl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4179) ret = -ENOTCONN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4180) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4183) bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4184) if (!bargs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4185) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4186) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4189) btrfs_update_ioctl_balance_args(fs_info, bargs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4191) if (copy_to_user(arg, bargs, sizeof(*bargs)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4192) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4194) kfree(bargs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4195) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4196) mutex_unlock(&fs_info->balance_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4197) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4200) static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4201) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4202) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4203) struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4204) struct btrfs_ioctl_quota_ctl_args *sa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4205) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4207) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4208) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4210) ret = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4211) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4212) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4214) sa = memdup_user(arg, sizeof(*sa));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4215) if (IS_ERR(sa)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4216) ret = PTR_ERR(sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4217) goto drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4220) down_write(&fs_info->subvol_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4222) switch (sa->cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4223) case BTRFS_QUOTA_CTL_ENABLE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4224) ret = btrfs_quota_enable(fs_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4225) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4226) case BTRFS_QUOTA_CTL_DISABLE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4227) ret = btrfs_quota_disable(fs_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4228) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4229) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4230) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4231) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4234) kfree(sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4235) up_write(&fs_info->subvol_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4236) drop_write:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4237) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4238) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4241) static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4243) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4244) struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4245) struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4246) struct btrfs_ioctl_qgroup_assign_args *sa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4247) struct btrfs_trans_handle *trans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4248) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4249) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4251) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4252) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4254) ret = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4255) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4256) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4258) sa = memdup_user(arg, sizeof(*sa));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4259) if (IS_ERR(sa)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4260) ret = PTR_ERR(sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4261) goto drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4264) trans = btrfs_join_transaction(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4265) if (IS_ERR(trans)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4266) ret = PTR_ERR(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4267) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4270) if (sa->assign) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4271) ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4272) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4273) ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4276) /* update qgroup status and info */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4277) err = btrfs_run_qgroups(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4278) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4279) btrfs_handle_fs_error(fs_info, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4280) "failed to update qgroup status and info");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4281) err = btrfs_end_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4282) if (err && !ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4283) ret = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4285) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4286) kfree(sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4287) drop_write:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4288) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4289) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4290) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4292) static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4293) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4294) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4295) struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4296) struct btrfs_ioctl_qgroup_create_args *sa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4297) struct btrfs_trans_handle *trans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4298) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4299) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4301) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4302) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4304) ret = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4305) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4306) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4308) sa = memdup_user(arg, sizeof(*sa));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4309) if (IS_ERR(sa)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4310) ret = PTR_ERR(sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4311) goto drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4312) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4314) if (!sa->qgroupid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4315) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4316) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4319) trans = btrfs_join_transaction(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4320) if (IS_ERR(trans)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4321) ret = PTR_ERR(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4322) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4323) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4325) if (sa->create) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4326) ret = btrfs_create_qgroup(trans, sa->qgroupid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4327) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4328) ret = btrfs_remove_qgroup(trans, sa->qgroupid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4329) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4331) err = btrfs_end_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4332) if (err && !ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4333) ret = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4335) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4336) kfree(sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4337) drop_write:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4338) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4339) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4340) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4342) static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4343) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4344) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4345) struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4346) struct btrfs_ioctl_qgroup_limit_args *sa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4347) struct btrfs_trans_handle *trans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4348) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4349) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4350) u64 qgroupid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4352) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4353) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4355) ret = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4356) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4357) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4359) sa = memdup_user(arg, sizeof(*sa));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4360) if (IS_ERR(sa)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4361) ret = PTR_ERR(sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4362) goto drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4363) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4365) trans = btrfs_join_transaction(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4366) if (IS_ERR(trans)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4367) ret = PTR_ERR(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4368) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4369) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4371) qgroupid = sa->qgroupid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4372) if (!qgroupid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4373) /* take the current subvol as qgroup */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4374) qgroupid = root->root_key.objectid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4375) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4377) ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4379) err = btrfs_end_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4380) if (err && !ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4381) ret = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4383) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4384) kfree(sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4385) drop_write:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4386) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4387) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4388) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4390) static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4391) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4392) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4393) struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4394) struct btrfs_ioctl_quota_rescan_args *qsa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4395) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4397) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4398) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4400) ret = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4401) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4402) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4404) qsa = memdup_user(arg, sizeof(*qsa));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4405) if (IS_ERR(qsa)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4406) ret = PTR_ERR(qsa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4407) goto drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4408) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4410) if (qsa->flags) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4411) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4412) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4413) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4415) ret = btrfs_qgroup_rescan(fs_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4417) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4418) kfree(qsa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4419) drop_write:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4420) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4421) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4422) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4424) static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4425) void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4426) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4427) struct btrfs_ioctl_quota_rescan_args *qsa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4428) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4429)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4430) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4431) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4433) qsa = kzalloc(sizeof(*qsa), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4434) if (!qsa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4435) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4437) if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4438) qsa->flags = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4439) qsa->progress = fs_info->qgroup_rescan_progress.objectid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4440) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4442) if (copy_to_user(arg, qsa, sizeof(*qsa)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4443) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4445) kfree(qsa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4446) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4447) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4449) static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4450) void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4451) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4452) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4453) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4455) return btrfs_qgroup_wait_for_completion(fs_info, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4456) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4457)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4458) static long _btrfs_ioctl_set_received_subvol(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4459) struct btrfs_ioctl_received_subvol_args *sa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4460) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4461) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4462) struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4463) struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4464) struct btrfs_root_item *root_item = &root->root_item;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4465) struct btrfs_trans_handle *trans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4466) struct timespec64 ct = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4467) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4468) int received_uuid_changed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4470) if (!inode_owner_or_capable(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4471) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4473) ret = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4474) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4475) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4477) down_write(&fs_info->subvol_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4479) if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4480) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4481) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4482) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4484) if (btrfs_root_readonly(root)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4485) ret = -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4486) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4487) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4489) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4490) * 1 - root item
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4491) * 2 - uuid items (received uuid + subvol uuid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4492) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4493) trans = btrfs_start_transaction(root, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4494) if (IS_ERR(trans)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4495) ret = PTR_ERR(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4496) trans = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4497) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4498) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4500) sa->rtransid = trans->transid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4501) sa->rtime.sec = ct.tv_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4502) sa->rtime.nsec = ct.tv_nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4504) received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4505) BTRFS_UUID_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4506) if (received_uuid_changed &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4507) !btrfs_is_empty_uuid(root_item->received_uuid)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4508) ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4509) BTRFS_UUID_KEY_RECEIVED_SUBVOL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4510) root->root_key.objectid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4511) if (ret && ret != -ENOENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4512) btrfs_abort_transaction(trans, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4513) btrfs_end_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4514) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4515) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4516) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4517) memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4518) btrfs_set_root_stransid(root_item, sa->stransid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4519) btrfs_set_root_rtransid(root_item, sa->rtransid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4520) btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4521) btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4522) btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4523) btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4525) ret = btrfs_update_root(trans, fs_info->tree_root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4526) &root->root_key, &root->root_item);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4527) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4528) btrfs_end_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4529) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4530) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4531) if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4532) ret = btrfs_uuid_tree_add(trans, sa->uuid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4533) BTRFS_UUID_KEY_RECEIVED_SUBVOL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4534) root->root_key.objectid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4535) if (ret < 0 && ret != -EEXIST) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4536) btrfs_abort_transaction(trans, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4537) btrfs_end_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4538) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4539) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4540) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4541) ret = btrfs_commit_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4542) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4543) up_write(&fs_info->subvol_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4544) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4545) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4546) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4548) #ifdef CONFIG_64BIT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4549) static long btrfs_ioctl_set_received_subvol_32(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4550) void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4551) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4552) struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4553) struct btrfs_ioctl_received_subvol_args *args64 = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4554) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4556) args32 = memdup_user(arg, sizeof(*args32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4557) if (IS_ERR(args32))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4558) return PTR_ERR(args32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4560) args64 = kmalloc(sizeof(*args64), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4561) if (!args64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4562) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4563) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4564) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4566) memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4567) args64->stransid = args32->stransid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4568) args64->rtransid = args32->rtransid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4569) args64->stime.sec = args32->stime.sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4570) args64->stime.nsec = args32->stime.nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4571) args64->rtime.sec = args32->rtime.sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4572) args64->rtime.nsec = args32->rtime.nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4573) args64->flags = args32->flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4575) ret = _btrfs_ioctl_set_received_subvol(file, args64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4576) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4577) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4578)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4579) memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4580) args32->stransid = args64->stransid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4581) args32->rtransid = args64->rtransid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4582) args32->stime.sec = args64->stime.sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4583) args32->stime.nsec = args64->stime.nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4584) args32->rtime.sec = args64->rtime.sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4585) args32->rtime.nsec = args64->rtime.nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4586) args32->flags = args64->flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4587)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4588) ret = copy_to_user(arg, args32, sizeof(*args32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4589) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4590) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4592) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4593) kfree(args32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4594) kfree(args64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4595) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4596) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4597) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4598)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4599) static long btrfs_ioctl_set_received_subvol(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4600) void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4601) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4602) struct btrfs_ioctl_received_subvol_args *sa = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4603) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4604)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4605) sa = memdup_user(arg, sizeof(*sa));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4606) if (IS_ERR(sa))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4607) return PTR_ERR(sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4608)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4609) ret = _btrfs_ioctl_set_received_subvol(file, sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4610)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4611) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4612) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4613)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4614) ret = copy_to_user(arg, sa, sizeof(*sa));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4615) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4616) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4618) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4619) kfree(sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4620) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4621) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4622)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4623) static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4624) void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4625) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4626) size_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4627) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4628) char label[BTRFS_LABEL_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4630) spin_lock(&fs_info->super_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4631) memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4632) spin_unlock(&fs_info->super_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4634) len = strnlen(label, BTRFS_LABEL_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4635)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4636) if (len == BTRFS_LABEL_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4637) btrfs_warn(fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4638) "label is too long, return the first %zu bytes",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4639) --len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4640) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4641)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4642) ret = copy_to_user(arg, label, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4643)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4644) return ret ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4645) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4647) static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4648) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4649) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4650) struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4651) struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4652) struct btrfs_super_block *super_block = fs_info->super_copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4653) struct btrfs_trans_handle *trans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4654) char label[BTRFS_LABEL_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4655) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4656)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4657) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4658) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4659)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4660) if (copy_from_user(label, arg, sizeof(label)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4661) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4662)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4663) if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4664) btrfs_err(fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4665) "unable to set label with more than %d bytes",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4666) BTRFS_LABEL_SIZE - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4667) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4668) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4669)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4670) ret = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4671) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4672) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4673)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4674) trans = btrfs_start_transaction(root, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4675) if (IS_ERR(trans)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4676) ret = PTR_ERR(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4677) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4678) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4679)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4680) spin_lock(&fs_info->super_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4681) strcpy(super_block->label, label);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4682) spin_unlock(&fs_info->super_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4683) ret = btrfs_commit_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4684)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4685) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4686) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4687) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4688) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4689)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4690) #define INIT_FEATURE_FLAGS(suffix) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4691) { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4692) .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4693) .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4694)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4695) int btrfs_ioctl_get_supported_features(void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4696) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4697) static const struct btrfs_ioctl_feature_flags features[3] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4698) INIT_FEATURE_FLAGS(SUPP),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4699) INIT_FEATURE_FLAGS(SAFE_SET),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4700) INIT_FEATURE_FLAGS(SAFE_CLEAR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4701) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4702)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4703) if (copy_to_user(arg, &features, sizeof(features)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4704) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4705)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4706) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4707) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4708)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4709) static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4710) void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4711) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4712) struct btrfs_super_block *super_block = fs_info->super_copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4713) struct btrfs_ioctl_feature_flags features;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4714)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4715) features.compat_flags = btrfs_super_compat_flags(super_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4716) features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4717) features.incompat_flags = btrfs_super_incompat_flags(super_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4718)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4719) if (copy_to_user(arg, &features, sizeof(features)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4720) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4721)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4722) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4723) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4724)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4725) static int check_feature_bits(struct btrfs_fs_info *fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4726) enum btrfs_feature_set set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4727) u64 change_mask, u64 flags, u64 supported_flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4728) u64 safe_set, u64 safe_clear)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4729) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4730) const char *type = btrfs_feature_set_name(set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4731) char *names;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4732) u64 disallowed, unsupported;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4733) u64 set_mask = flags & change_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4734) u64 clear_mask = ~flags & change_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4735)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4736) unsupported = set_mask & ~supported_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4737) if (unsupported) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4738) names = btrfs_printable_features(set, unsupported);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4739) if (names) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4740) btrfs_warn(fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4741) "this kernel does not support the %s feature bit%s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4742) names, strchr(names, ',') ? "s" : "");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4743) kfree(names);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4744) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4745) btrfs_warn(fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4746) "this kernel does not support %s bits 0x%llx",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4747) type, unsupported);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4748) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4749) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4750)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4751) disallowed = set_mask & ~safe_set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4752) if (disallowed) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4753) names = btrfs_printable_features(set, disallowed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4754) if (names) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4755) btrfs_warn(fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4756) "can't set the %s feature bit%s while mounted",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4757) names, strchr(names, ',') ? "s" : "");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4758) kfree(names);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4759) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4760) btrfs_warn(fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4761) "can't set %s bits 0x%llx while mounted",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4762) type, disallowed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4763) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4764) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4765)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4766) disallowed = clear_mask & ~safe_clear;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4767) if (disallowed) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4768) names = btrfs_printable_features(set, disallowed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4769) if (names) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4770) btrfs_warn(fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4771) "can't clear the %s feature bit%s while mounted",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4772) names, strchr(names, ',') ? "s" : "");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4773) kfree(names);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4774) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4775) btrfs_warn(fs_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4776) "can't clear %s bits 0x%llx while mounted",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4777) type, disallowed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4778) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4779) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4780)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4781) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4782) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4783)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4784) #define check_feature(fs_info, change_mask, flags, mask_base) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4785) check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4786) BTRFS_FEATURE_ ## mask_base ## _SUPP, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4787) BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4788) BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4789)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4790) static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4791) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4792) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4793) struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4794) struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4795) struct btrfs_super_block *super_block = fs_info->super_copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4796) struct btrfs_ioctl_feature_flags flags[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4797) struct btrfs_trans_handle *trans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4798) u64 newflags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4799) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4800)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4801) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4802) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4803)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4804) if (copy_from_user(flags, arg, sizeof(flags)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4805) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4806)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4807) /* Nothing to do */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4808) if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4809) !flags[0].incompat_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4810) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4811)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4812) ret = check_feature(fs_info, flags[0].compat_flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4813) flags[1].compat_flags, COMPAT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4814) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4815) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4816)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4817) ret = check_feature(fs_info, flags[0].compat_ro_flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4818) flags[1].compat_ro_flags, COMPAT_RO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4819) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4820) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4821)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4822) ret = check_feature(fs_info, flags[0].incompat_flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4823) flags[1].incompat_flags, INCOMPAT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4824) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4825) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4826)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4827) ret = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4828) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4829) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4830)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4831) trans = btrfs_start_transaction(root, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4832) if (IS_ERR(trans)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4833) ret = PTR_ERR(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4834) goto out_drop_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4835) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4836)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4837) spin_lock(&fs_info->super_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4838) newflags = btrfs_super_compat_flags(super_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4839) newflags |= flags[0].compat_flags & flags[1].compat_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4840) newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4841) btrfs_set_super_compat_flags(super_block, newflags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4842)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4843) newflags = btrfs_super_compat_ro_flags(super_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4844) newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4845) newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4846) btrfs_set_super_compat_ro_flags(super_block, newflags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4847)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4848) newflags = btrfs_super_incompat_flags(super_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4849) newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4850) newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4851) btrfs_set_super_incompat_flags(super_block, newflags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4852) spin_unlock(&fs_info->super_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4853)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4854) ret = btrfs_commit_transaction(trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4855) out_drop_write:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4856) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4857)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4858) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4859) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4860)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4861) static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4862) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4863) struct btrfs_ioctl_send_args *arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4864) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4865)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4866) if (compat) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4867) #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4868) struct btrfs_ioctl_send_args_32 args32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4869)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4870) ret = copy_from_user(&args32, argp, sizeof(args32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4871) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4872) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4873) arg = kzalloc(sizeof(*arg), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4874) if (!arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4875) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4876) arg->send_fd = args32.send_fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4877) arg->clone_sources_count = args32.clone_sources_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4878) arg->clone_sources = compat_ptr(args32.clone_sources);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4879) arg->parent_root = args32.parent_root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4880) arg->flags = args32.flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4881) memcpy(arg->reserved, args32.reserved,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4882) sizeof(args32.reserved));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4883) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4884) return -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4885) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4886) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4887) arg = memdup_user(argp, sizeof(*arg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4888) if (IS_ERR(arg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4889) return PTR_ERR(arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4890) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4891) ret = btrfs_ioctl_send(file, arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4892) kfree(arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4893) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4894) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4895)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4896) long btrfs_ioctl(struct file *file, unsigned int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4897) cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4898) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4899) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4900) struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4901) struct btrfs_root *root = BTRFS_I(inode)->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4902) void __user *argp = (void __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4903)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4904) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4905) case FS_IOC_GETFLAGS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4906) return btrfs_ioctl_getflags(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4907) case FS_IOC_SETFLAGS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4908) return btrfs_ioctl_setflags(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4909) case FS_IOC_GETVERSION:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4910) return btrfs_ioctl_getversion(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4911) case FS_IOC_GETFSLABEL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4912) return btrfs_ioctl_get_fslabel(fs_info, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4913) case FS_IOC_SETFSLABEL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4914) return btrfs_ioctl_set_fslabel(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4915) case FITRIM:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4916) return btrfs_ioctl_fitrim(fs_info, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4917) case BTRFS_IOC_SNAP_CREATE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4918) return btrfs_ioctl_snap_create(file, argp, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4919) case BTRFS_IOC_SNAP_CREATE_V2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4920) return btrfs_ioctl_snap_create_v2(file, argp, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4921) case BTRFS_IOC_SUBVOL_CREATE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4922) return btrfs_ioctl_snap_create(file, argp, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4923) case BTRFS_IOC_SUBVOL_CREATE_V2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4924) return btrfs_ioctl_snap_create_v2(file, argp, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4925) case BTRFS_IOC_SNAP_DESTROY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4926) return btrfs_ioctl_snap_destroy(file, argp, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4927) case BTRFS_IOC_SNAP_DESTROY_V2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4928) return btrfs_ioctl_snap_destroy(file, argp, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4929) case BTRFS_IOC_SUBVOL_GETFLAGS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4930) return btrfs_ioctl_subvol_getflags(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4931) case BTRFS_IOC_SUBVOL_SETFLAGS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4932) return btrfs_ioctl_subvol_setflags(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4933) case BTRFS_IOC_DEFAULT_SUBVOL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4934) return btrfs_ioctl_default_subvol(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4935) case BTRFS_IOC_DEFRAG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4936) return btrfs_ioctl_defrag(file, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4937) case BTRFS_IOC_DEFRAG_RANGE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4938) return btrfs_ioctl_defrag(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4939) case BTRFS_IOC_RESIZE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4940) return btrfs_ioctl_resize(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4941) case BTRFS_IOC_ADD_DEV:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4942) return btrfs_ioctl_add_dev(fs_info, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4943) case BTRFS_IOC_RM_DEV:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4944) return btrfs_ioctl_rm_dev(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4945) case BTRFS_IOC_RM_DEV_V2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4946) return btrfs_ioctl_rm_dev_v2(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4947) case BTRFS_IOC_FS_INFO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4948) return btrfs_ioctl_fs_info(fs_info, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4949) case BTRFS_IOC_DEV_INFO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4950) return btrfs_ioctl_dev_info(fs_info, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4951) case BTRFS_IOC_BALANCE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4952) return btrfs_ioctl_balance(file, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4953) case BTRFS_IOC_TREE_SEARCH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4954) return btrfs_ioctl_tree_search(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4955) case BTRFS_IOC_TREE_SEARCH_V2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4956) return btrfs_ioctl_tree_search_v2(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4957) case BTRFS_IOC_INO_LOOKUP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4958) return btrfs_ioctl_ino_lookup(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4959) case BTRFS_IOC_INO_PATHS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4960) return btrfs_ioctl_ino_to_path(root, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4961) case BTRFS_IOC_LOGICAL_INO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4962) return btrfs_ioctl_logical_to_ino(fs_info, argp, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4963) case BTRFS_IOC_LOGICAL_INO_V2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4964) return btrfs_ioctl_logical_to_ino(fs_info, argp, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4965) case BTRFS_IOC_SPACE_INFO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4966) return btrfs_ioctl_space_info(fs_info, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4967) case BTRFS_IOC_SYNC: {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4968) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4969)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4970) ret = btrfs_start_delalloc_roots(fs_info, U64_MAX, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4971) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4972) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4973) ret = btrfs_sync_fs(inode->i_sb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4974) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4975) * The transaction thread may want to do more work,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4976) * namely it pokes the cleaner kthread that will start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4977) * processing uncleaned subvols.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4978) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4979) wake_up_process(fs_info->transaction_kthread);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4980) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4981) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4982) case BTRFS_IOC_START_SYNC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4983) return btrfs_ioctl_start_sync(root, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4984) case BTRFS_IOC_WAIT_SYNC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4985) return btrfs_ioctl_wait_sync(fs_info, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4986) case BTRFS_IOC_SCRUB:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4987) return btrfs_ioctl_scrub(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4988) case BTRFS_IOC_SCRUB_CANCEL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4989) return btrfs_ioctl_scrub_cancel(fs_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4990) case BTRFS_IOC_SCRUB_PROGRESS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4991) return btrfs_ioctl_scrub_progress(fs_info, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4992) case BTRFS_IOC_BALANCE_V2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4993) return btrfs_ioctl_balance(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4994) case BTRFS_IOC_BALANCE_CTL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4995) return btrfs_ioctl_balance_ctl(fs_info, arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4996) case BTRFS_IOC_BALANCE_PROGRESS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4997) return btrfs_ioctl_balance_progress(fs_info, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4998) case BTRFS_IOC_SET_RECEIVED_SUBVOL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4999) return btrfs_ioctl_set_received_subvol(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5000) #ifdef CONFIG_64BIT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5001) case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5002) return btrfs_ioctl_set_received_subvol_32(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5003) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5004) case BTRFS_IOC_SEND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5005) return _btrfs_ioctl_send(file, argp, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5006) #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5007) case BTRFS_IOC_SEND_32:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5008) return _btrfs_ioctl_send(file, argp, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5009) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5010) case BTRFS_IOC_GET_DEV_STATS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5011) return btrfs_ioctl_get_dev_stats(fs_info, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5012) case BTRFS_IOC_QUOTA_CTL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5013) return btrfs_ioctl_quota_ctl(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5014) case BTRFS_IOC_QGROUP_ASSIGN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5015) return btrfs_ioctl_qgroup_assign(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5016) case BTRFS_IOC_QGROUP_CREATE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5017) return btrfs_ioctl_qgroup_create(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5018) case BTRFS_IOC_QGROUP_LIMIT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5019) return btrfs_ioctl_qgroup_limit(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5020) case BTRFS_IOC_QUOTA_RESCAN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5021) return btrfs_ioctl_quota_rescan(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5022) case BTRFS_IOC_QUOTA_RESCAN_STATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5023) return btrfs_ioctl_quota_rescan_status(fs_info, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5024) case BTRFS_IOC_QUOTA_RESCAN_WAIT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5025) return btrfs_ioctl_quota_rescan_wait(fs_info, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5026) case BTRFS_IOC_DEV_REPLACE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5027) return btrfs_ioctl_dev_replace(fs_info, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5028) case BTRFS_IOC_GET_SUPPORTED_FEATURES:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5029) return btrfs_ioctl_get_supported_features(argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5030) case BTRFS_IOC_GET_FEATURES:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5031) return btrfs_ioctl_get_features(fs_info, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5032) case BTRFS_IOC_SET_FEATURES:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5033) return btrfs_ioctl_set_features(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5034) case FS_IOC_FSGETXATTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5035) return btrfs_ioctl_fsgetxattr(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5036) case FS_IOC_FSSETXATTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5037) return btrfs_ioctl_fssetxattr(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5038) case BTRFS_IOC_GET_SUBVOL_INFO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5039) return btrfs_ioctl_get_subvol_info(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5040) case BTRFS_IOC_GET_SUBVOL_ROOTREF:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5041) return btrfs_ioctl_get_subvol_rootref(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5042) case BTRFS_IOC_INO_LOOKUP_USER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5043) return btrfs_ioctl_ino_lookup_user(file, argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5044) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5045)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5046) return -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5047) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5048)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5049) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5050) long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5051) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5052) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5053) * These all access 32-bit values anyway so no further
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5054) * handling is necessary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5055) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5056) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5057) case FS_IOC32_GETFLAGS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5058) cmd = FS_IOC_GETFLAGS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5059) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5060) case FS_IOC32_SETFLAGS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5061) cmd = FS_IOC_SETFLAGS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5062) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5063) case FS_IOC32_GETVERSION:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5064) cmd = FS_IOC_GETVERSION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5065) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5066) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5067)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5068) return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5069) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5070) #endif
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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