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| author | Naohiro Aota <naohiro.aota@wdc.com> | 2020-11-10 14:26:11 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2020-12-09 21:16:04 +0300 |
| commit | d206e9c9c576a0de2e6d1fdf17551e2a548955c0 (patch) | |
| tree | 44c4cd209a2c8e3ee5dcef681a30345b847f1cf4 /fs/btrfs/ioctl.c | |
| parent | 5d1ab66c56fed152acbbac1933b16d33ebd47d7f (diff) | |
| download | linux-d206e9c9c576a0de2e6d1fdf17551e2a548955c0.tar.xz | |
btrfs: disallow NODATACOW in ZONED mode
NODATACOW implies overwriting the file data on a device, which is
impossible in sequential required zones. Disable NODATACOW globally with
mount option and per-file NODATACOW attribute by masking FS_NOCOW_FL.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/ioctl.c')
| -rw-r--r-- | fs/btrfs/ioctl.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index a5dc7cc5d705..0b5e1df24906 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -193,6 +193,15 @@ static int check_fsflags(unsigned int old_flags, unsigned int flags) return 0; } +static int check_fsflags_compatible(struct btrfs_fs_info *fs_info, + unsigned int flags) +{ + if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL)) + return -EPERM; + + return 0; +} + static int btrfs_ioctl_setflags(struct file *file, void __user *arg) { struct inode *inode = file_inode(file); @@ -230,6 +239,10 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg) if (ret) goto out_unlock; + ret = check_fsflags_compatible(fs_info, fsflags); + if (ret) + goto out_unlock; + binode_flags = binode->flags; if (fsflags & FS_SYNC_FL) binode_flags |= BTRFS_INODE_SYNC; |