^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 Red Hat. 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/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/xattr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/posix_acl_xattr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/posix_acl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/sched/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include "ctree.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include "btrfs_inode.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "xattr.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) int size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) const char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) char *value = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct posix_acl *acl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) switch (type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) case ACL_TYPE_ACCESS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) name = XATTR_NAME_POSIX_ACL_ACCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) case ACL_TYPE_DEFAULT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) name = XATTR_NAME_POSIX_ACL_DEFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) size = btrfs_getxattr(inode, name, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) if (size > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) value = kzalloc(size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (!value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) size = btrfs_getxattr(inode, name, value, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) if (size > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) acl = posix_acl_from_xattr(&init_user_ns, value, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) else if (size == -ENODATA || size == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) acl = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) acl = ERR_PTR(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) kfree(value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return acl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static int __btrfs_set_acl(struct btrfs_trans_handle *trans,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) struct inode *inode, struct posix_acl *acl, int type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) int ret, size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) const char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) char *value = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) switch (type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) case ACL_TYPE_ACCESS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) name = XATTR_NAME_POSIX_ACL_ACCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) case ACL_TYPE_DEFAULT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) if (!S_ISDIR(inode->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) return acl ? -EINVAL : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) name = XATTR_NAME_POSIX_ACL_DEFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (acl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) unsigned int nofs_flag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) size = posix_acl_xattr_size(acl->a_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * We're holding a transaction handle, so use a NOFS memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * allocation context to avoid deadlock if reclaim happens.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) nofs_flag = memalloc_nofs_save();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) value = kmalloc(size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) memalloc_nofs_restore(nofs_flag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (!value) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (trans)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) ret = btrfs_setxattr(trans, inode, name, value, size, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) ret = btrfs_setxattr_trans(inode, name, value, size, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) kfree(value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) set_cached_acl(inode, type, acl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) umode_t old_mode = inode->i_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) if (type == ACL_TYPE_ACCESS && acl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) ret = posix_acl_update_mode(inode, &inode->i_mode, &acl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) ret = __btrfs_set_acl(NULL, inode, acl, type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) inode->i_mode = old_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) int btrfs_init_acl(struct btrfs_trans_handle *trans,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct inode *inode, struct inode *dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) struct posix_acl *default_acl, *acl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) /* this happens with subvols */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (!dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) ret = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (default_acl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) ret = __btrfs_set_acl(trans, inode, default_acl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) ACL_TYPE_DEFAULT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) posix_acl_release(default_acl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (acl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) ret = __btrfs_set_acl(trans, inode, acl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) ACL_TYPE_ACCESS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) posix_acl_release(acl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (!default_acl && !acl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) cache_no_acl(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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