path: root/fs
diff options
authorFilipe Manana <fdmanana@suse.com>2019-05-16 15:48:55 +0100
committerPaul Gortmaker <paul.gortmaker@windriver.com>2019-09-12 14:08:41 -0400
commit16de1dc1989d3714afad30a2a753fec7895444ba (patch)
tree7c3c78a8a9cbf192814957de87def0b054dba56b /fs
parent0fe85adf8e16ac64b276d0d20164b641880398c3 (diff)
Btrfs: fix fsync not persisting changed attributes of a directory
commit 60d9f50308e5df19bc18c2fefab0eba4a843900a upstream. While logging an inode we follow its ancestors and for each one we mark it as logged in the current transaction, even if we have not logged it. As a consequence if we change an attribute of an ancestor, such as the UID or GID for example, and then explicitly fsync it, we end up not logging the inode at all despite returning success to user space, which results in the attribute being lost if a power failure happens after the fsync. Sample reproducer: $ mkfs.btrfs -f /dev/sdb $ mount /dev/sdb /mnt $ mkdir /mnt/dir $ chown 6007:6007 /mnt/dir $ sync $ chown 9003:9003 /mnt/dir $ touch /mnt/dir/file $ xfs_io -c fsync /mnt/dir/file # fsync our directory after fsync'ing the new file, should persist the # new values for the uid and gid. $ xfs_io -c fsync /mnt/dir <power failure> $ mount /dev/sdb /mnt $ stat -c %u:%g /mnt/dir 6007:6007 --> should be 9003:9003, the uid and gid were not persisted, despite the explicit fsync on the directory prior to the power failure Fix this by not updating the logged_trans field of ancestor inodes when logging an inode, since we have not logged them. Let only future calls to btrfs_log_inode() to mark inodes as logged. 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: 12fcfd22fe5b ("Btrfs: tree logging unlink/rename fixes") CC: stable@vger.kernel.org # 4.4+ Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Diffstat (limited to 'fs')
1 files changed, 0 insertions, 12 deletions
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 52d1a8380dd8..76ee43efbf86 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -5447,7 +5447,6 @@ static noinline int check_parent_dirs_for_sync(struct btrfs_trans_handle *trans,
int ret = 0;
struct dentry *old_parent = NULL;
- struct btrfs_inode *orig_inode = inode;
* for regular files, if its inode is already on disk, we don't
@@ -5467,16 +5466,6 @@ static noinline int check_parent_dirs_for_sync(struct btrfs_trans_handle *trans,
while (1) {
- /*
- * If we are logging a directory then we start with our inode,
- * not our parent's inode, so we need to skip setting the
- * logged_trans so that further down in the log code we don't
- * think this inode has already been logged.
- */
- if (inode != orig_inode)
- inode->logged_trans = trans->transid;
- smp_mb();
if (btrfs_must_commit_transaction(trans, inode)) {
ret = 1;
@@ -6205,7 +6194,6 @@ void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans,
* if this directory was already logged any new
* names for this file/dir will get recorded
- smp_mb();
if (dir->logged_trans == trans->transid)