^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/fs/fat/file.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Written 1992,1993 by Werner Almesberger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * regular file handling primitives for fat-based filesystems
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/capability.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/blkdev.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/fsnotify.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/falloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include "fat.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static long fat_fallocate(struct file *file, int mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) loff_t offset, loff_t len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static int fat_ioctl_get_attributes(struct inode *inode, u32 __user *user_attr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) u32 attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) inode_lock_shared(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) attr = fat_make_attrs(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) inode_unlock_shared(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) return put_user(attr, user_attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static int fat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) int is_dir = S_ISDIR(inode->i_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) u32 attr, oldattr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct iattr ia;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) err = get_user(attr, user_attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) err = mnt_want_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) inode_lock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * ATTR_VOLUME and ATTR_DIR cannot be changed; this also
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * prevents the user from turning us into a VFAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * longname entry. Also, we obviously can't set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * any of the NTFS attributes in the high 24 bits.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) attr &= 0xff & ~(ATTR_VOLUME | ATTR_DIR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) /* Merge in ATTR_VOLUME and ATTR_DIR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) attr |= (MSDOS_I(inode)->i_attrs & ATTR_VOLUME) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) (is_dir ? ATTR_DIR : 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) oldattr = fat_make_attrs(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) /* Equivalent to a chmod() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) ia.ia_valid = ATTR_MODE | ATTR_CTIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) ia.ia_ctime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (is_dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) ia.ia_mode = fat_make_mode(sbi, attr, S_IRWXUGO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) ia.ia_mode = fat_make_mode(sbi, attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) S_IRUGO | S_IWUGO | (inode->i_mode & S_IXUGO));
^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) /* The root directory has no attributes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (inode->i_ino == MSDOS_ROOT_INO && attr != ATTR_DIR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) goto out_unlock_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) if (sbi->options.sys_immutable &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) ((attr | oldattr) & ATTR_SYS) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) !capable(CAP_LINUX_IMMUTABLE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) err = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) goto out_unlock_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * The security check is questionable... We single
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * out the RO attribute for checking by the security
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * module, just because it maps to a file mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) err = security_inode_setattr(file->f_path.dentry, &ia);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) goto out_unlock_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) /* This MUST be done before doing anything irreversible... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) err = fat_setattr(file->f_path.dentry, &ia);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) goto out_unlock_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) fsnotify_change(file->f_path.dentry, ia.ia_valid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (sbi->options.sys_immutable) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (attr & ATTR_SYS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) inode->i_flags |= S_IMMUTABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) inode->i_flags &= ~S_IMMUTABLE;
^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) fat_save_attrs(inode, attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) out_unlock_inode:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) inode_unlock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) mnt_drop_write_file(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static int fat_ioctl_get_volume_id(struct inode *inode, u32 __user *user_attr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) return put_user(sbi->vol_id, user_attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static int fat_ioctl_fitrim(struct inode *inode, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) struct fstrim_range __user *user_range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) struct fstrim_range range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) struct request_queue *q = bdev_get_queue(sb->s_bdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (!blk_queue_discard(q))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) user_range = (struct fstrim_range __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (copy_from_user(&range, user_range, sizeof(range)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) range.minlen = max_t(unsigned int, range.minlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) q->limits.discard_granularity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) err = fat_trim_fs(inode, &range);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (copy_to_user(user_range, &range, sizeof(range)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) long fat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) struct inode *inode = file_inode(filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) u32 __user *user_attr = (u32 __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) case FAT_IOCTL_GET_ATTRIBUTES:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) return fat_ioctl_get_attributes(inode, user_attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) case FAT_IOCTL_SET_ATTRIBUTES:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) return fat_ioctl_set_attributes(filp, user_attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) case FAT_IOCTL_GET_VOLUME_ID:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return fat_ioctl_get_volume_id(inode, user_attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) case FITRIM:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) return fat_ioctl_fitrim(inode, arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) return -ENOTTY; /* Inappropriate ioctl for device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) static int fat_file_release(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) if ((filp->f_mode & FMODE_WRITE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) MSDOS_SB(inode->i_sb)->options.flush) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) fat_flush_inodes(inode->i_sb, inode, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) congestion_wait(BLK_RW_ASYNC, HZ/10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) int fat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) struct inode *inode = filp->f_mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) err = __generic_file_fsync(filp, start, end, datasync);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) err = sync_mapping_buffers(MSDOS_SB(inode->i_sb)->fat_inode->i_mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) return blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) const struct file_operations fat_file_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) .llseek = generic_file_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) .read_iter = generic_file_read_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) .write_iter = generic_file_write_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) .mmap = generic_file_mmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) .release = fat_file_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) .unlocked_ioctl = fat_generic_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) .compat_ioctl = compat_ptr_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) .fsync = fat_file_fsync,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) .splice_read = generic_file_splice_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) .splice_write = iter_file_splice_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) .fallocate = fat_fallocate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) static int fat_cont_expand(struct inode *inode, loff_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) struct address_space *mapping = inode->i_mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) loff_t start = inode->i_size, count = size - inode->i_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) err = generic_cont_expand_simple(inode, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) fat_truncate_time(inode, NULL, S_CTIME|S_MTIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) if (IS_SYNC(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) int err2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) * Opencode syncing since we don't have a file open to use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) * standard fsync path.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) err = filemap_fdatawrite_range(mapping, start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) start + count - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) err2 = sync_mapping_buffers(mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) err = err2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) err2 = write_inode_now(inode, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) err = err2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) if (!err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) err = filemap_fdatawait_range(mapping, start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) start + count - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) * Preallocate space for a file. This implements fat's fallocate file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) * operation, which gets called from sys_fallocate system call. User
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) * space requests len bytes at offset. If FALLOC_FL_KEEP_SIZE is set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) * we just allocate clusters without zeroing them out. Otherwise we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) * allocate and zero out clusters via an expanding truncate.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) static long fat_fallocate(struct file *file, int mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) loff_t offset, loff_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) int nr_cluster; /* Number of clusters to be allocated */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) loff_t mm_bytes; /* Number of bytes to be allocated for file */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) loff_t ondisksize; /* block aligned on-disk size in bytes*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) struct inode *inode = file->f_mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) struct msdos_sb_info *sbi = MSDOS_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) /* No support for hole punch or other fallocate flags. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) if (mode & ~FALLOC_FL_KEEP_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) /* No support for dir */
^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) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) inode_lock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) if (mode & FALLOC_FL_KEEP_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) ondisksize = inode->i_blocks << 9;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) if ((offset + len) <= ondisksize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) /* First compute the number of clusters to be allocated */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) mm_bytes = offset + len - ondisksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) nr_cluster = (mm_bytes + (sbi->cluster_size - 1)) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) sbi->cluster_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) /* Start the allocation.We are not zeroing out the clusters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) while (nr_cluster-- > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) err = fat_add_cluster(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) if ((offset + len) <= i_size_read(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) /* This is just an expanding truncate */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) err = fat_cont_expand(inode, (offset + len));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) inode_unlock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) /* Free all clusters after the skip'th cluster. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) static int fat_free(struct inode *inode, int skip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) int err, wait, free_start, i_start, i_logstart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) if (MSDOS_I(inode)->i_start == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) fat_cache_inval_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) wait = IS_DIRSYNC(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) i_start = free_start = MSDOS_I(inode)->i_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) i_logstart = MSDOS_I(inode)->i_logstart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) /* First, we write the new file size. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) if (!skip) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) MSDOS_I(inode)->i_start = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) MSDOS_I(inode)->i_logstart = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) fat_truncate_time(inode, NULL, S_CTIME|S_MTIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) if (wait) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) err = fat_sync_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) MSDOS_I(inode)->i_start = i_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) MSDOS_I(inode)->i_logstart = i_logstart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) /* Write a new EOF, and get the remaining cluster chain for freeing. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) if (skip) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) struct fat_entry fatent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) int ret, fclus, dclus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) ret = fat_get_cluster(inode, skip - 1, &fclus, &dclus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) else if (ret == FAT_ENT_EOF)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) fatent_init(&fatent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) ret = fat_ent_read(inode, &fatent, dclus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) if (ret == FAT_ENT_EOF) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) fatent_brelse(&fatent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) } else if (ret == FAT_ENT_FREE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) fat_fs_error(sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) "%s: invalid cluster chain (i_pos %lld)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) __func__, MSDOS_I(inode)->i_pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) } else if (ret > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) err = fat_ent_write(inode, &fatent, FAT_ENT_EOF, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) ret = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) fatent_brelse(&fatent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) free_start = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) inode->i_blocks = skip << (MSDOS_SB(sb)->cluster_bits - 9);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) /* Freeing the remained cluster chain */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) return fat_free_clusters(inode, free_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) void fat_truncate_blocks(struct inode *inode, loff_t offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) const unsigned int cluster_size = sbi->cluster_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) int nr_clusters;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) * This protects against truncating a file bigger than it was then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) * trying to write into the hole.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) if (MSDOS_I(inode)->mmu_private > offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) MSDOS_I(inode)->mmu_private = offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) nr_clusters = (offset + (cluster_size - 1)) >> sbi->cluster_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) fat_free(inode, nr_clusters);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) fat_flush_inodes(inode->i_sb, inode, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) int fat_getattr(const struct path *path, struct kstat *stat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) u32 request_mask, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) struct inode *inode = d_inode(path->dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) generic_fillattr(inode, stat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) stat->blksize = MSDOS_SB(inode->i_sb)->cluster_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) if (MSDOS_SB(inode->i_sb)->options.nfs == FAT_NFS_NOSTALE_RO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) /* Use i_pos for ino. This is used as fileid of nfs. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) stat->ino = fat_i_pos_read(MSDOS_SB(inode->i_sb), inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) EXPORT_SYMBOL_GPL(fat_getattr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) static int fat_sanitize_mode(const struct msdos_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) struct inode *inode, umode_t *mode_ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) umode_t mask, perm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) * Note, the basic check is already done by a caller of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) * (attr->ia_mode & ~FAT_VALID_MODE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) if (S_ISREG(inode->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) mask = sbi->options.fs_fmask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) mask = sbi->options.fs_dmask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) perm = *mode_ptr & ~(S_IFMT | mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) * Of the r and x bits, all (subject to umask) must be present. Of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) * w bits, either all (subject to umask) or none must be present.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) * If fat_mode_can_hold_ro(inode) is false, can't change w bits.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) if ((perm & (S_IRUGO | S_IXUGO)) != (inode->i_mode & (S_IRUGO|S_IXUGO)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) if (fat_mode_can_hold_ro(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) if ((perm & S_IWUGO) && ((perm & S_IWUGO) != (S_IWUGO & ~mask)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) if ((perm & S_IWUGO) != (S_IWUGO & ~mask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) *mode_ptr &= S_IFMT | perm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) static int fat_allow_set_time(struct msdos_sb_info *sbi, struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) umode_t allow_utime = sbi->options.allow_utime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) if (!uid_eq(current_fsuid(), inode->i_uid)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) if (in_group_p(inode->i_gid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) allow_utime >>= 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) if (allow_utime & MAY_WRITE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) /* use a default check */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) #define TIMES_SET_FLAGS (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) /* valid file mode bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) #define FAT_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXUGO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) int fat_setattr(struct dentry *dentry, struct iattr *attr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) struct inode *inode = d_inode(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) unsigned int ia_valid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) /* Check for setting the inode time. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) ia_valid = attr->ia_valid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) if (ia_valid & TIMES_SET_FLAGS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) if (fat_allow_set_time(sbi, inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) attr->ia_valid &= ~TIMES_SET_FLAGS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) error = setattr_prepare(dentry, attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) attr->ia_valid = ia_valid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) if (sbi->options.quiet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) }
^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) * Expand the file. Since inode_setattr() updates ->i_size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) * before calling the ->truncate(), but FAT needs to fill the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) * hole before it. XXX: this is no longer true with new truncate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) * sequence.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) if (attr->ia_valid & ATTR_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) inode_dio_wait(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) if (attr->ia_size > inode->i_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) error = fat_cont_expand(inode, attr->ia_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) if (error || attr->ia_valid == ATTR_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) attr->ia_valid &= ~ATTR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) if (((attr->ia_valid & ATTR_UID) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) (!uid_eq(attr->ia_uid, sbi->options.fs_uid))) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) ((attr->ia_valid & ATTR_GID) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) (!gid_eq(attr->ia_gid, sbi->options.fs_gid))) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) ((attr->ia_valid & ATTR_MODE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) (attr->ia_mode & ~FAT_VALID_MODE)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) error = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) if (sbi->options.quiet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) * We don't return -EPERM here. Yes, strange, but this is too
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) * old behavior.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) if (attr->ia_valid & ATTR_MODE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) if (fat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) attr->ia_valid &= ~ATTR_MODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) if (attr->ia_valid & ATTR_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) error = fat_block_truncate_page(inode, attr->ia_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) down_write(&MSDOS_I(inode)->truncate_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) truncate_setsize(inode, attr->ia_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) fat_truncate_blocks(inode, attr->ia_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) up_write(&MSDOS_I(inode)->truncate_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) * setattr_copy can't truncate these appropriately, so we'll
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) * copy them ourselves
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) if (attr->ia_valid & ATTR_ATIME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) fat_truncate_time(inode, &attr->ia_atime, S_ATIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) if (attr->ia_valid & ATTR_CTIME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) fat_truncate_time(inode, &attr->ia_ctime, S_CTIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) if (attr->ia_valid & ATTR_MTIME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) fat_truncate_time(inode, &attr->ia_mtime, S_MTIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) attr->ia_valid &= ~(ATTR_ATIME|ATTR_CTIME|ATTR_MTIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) setattr_copy(inode, attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) EXPORT_SYMBOL_GPL(fat_setattr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) const struct inode_operations fat_file_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) .setattr = fat_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) .getattr = fat_getattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) .update_time = fat_update_time,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) };
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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