diff options
author | Filipe Manana <fdmanana@suse.com> | 2019-05-15 18:02:47 +0300 |
---|---|---|
committer | David Sterba <dsterba@suse.com> | 2019-05-28 20:16:16 +0300 |
commit | 5338e43abbab13791144d37fd8846847062351c6 (patch) | |
tree | 4b23bb648971ea713dcf04ca7e3251f3bbb3159d /fs/btrfs | |
parent | 60d9f50308e5df19bc18c2fefab0eba4a843900a (diff) |
Btrfs: fix wrong ctime and mtime of a directory after log replay
When replaying a log that contains a new file or directory name that needs
to be added to its parent directory, we end up updating the mtime and the
ctime of the parent directory to the current time after we have set their
values to the correct ones (set at fsync time), efectivelly losing them.
Sample reproducer:
$ mkfs.btrfs -f /dev/sdb
$ mount /dev/sdb /mnt
$ mkdir /mnt/dir
$ touch /mnt/dir/file
# fsync of the directory is optional, not needed
$ xfs_io -c fsync /mnt/dir
$ xfs_io -c fsync /mnt/dir/file
$ stat -c %Y /mnt/dir
1557856079
<power failure>
$ sleep 3
$ mount /dev/sdb /mnt
$ stat -c %Y /mnt/dir
1557856082
--> should have been 1557856079, the mtime is updated to the current
time when replaying the log
Fix this by not updating the mtime and ctime to the current time at
btrfs_add_link() when we are replaying a log tree.
This could be triggered by my recent fsync fuzz tester for fstests, for
which an fstests patch exists titled "fstests: generic, fsync fuzz tester
with fsstress".
Fixes: e02119d5a7b43 ("Btrfs: Add a write ahead tree log to optimize synchronous operations")
CC: stable@vger.kernel.org # 4.4+
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs')
-rw-r--r-- | fs/btrfs/inode.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index b6d549c993f6..6bebc0ca751d 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -6433,8 +6433,18 @@ int btrfs_add_link(struct btrfs_trans_handle *trans, btrfs_i_size_write(parent_inode, parent_inode->vfs_inode.i_size + name_len * 2); inode_inc_iversion(&parent_inode->vfs_inode); - parent_inode->vfs_inode.i_mtime = parent_inode->vfs_inode.i_ctime = - current_time(&parent_inode->vfs_inode); + /* + * If we are replaying a log tree, we do not want to update the mtime + * and ctime of the parent directory with the current time, since the + * log replay procedure is responsible for setting them to their correct + * values (the ones it had when the fsync was done). + */ + if (!test_bit(BTRFS_FS_LOG_RECOVERING, &root->fs_info->flags)) { + struct timespec64 now = current_time(&parent_inode->vfs_inode); + + parent_inode->vfs_inode.i_mtime = now; + parent_inode->vfs_inode.i_ctime = now; + } ret = btrfs_update_inode(trans, root, &parent_inode->vfs_inode); if (ret) btrfs_abort_transaction(trans, ret); |