6.6-stable review patch. If anyone has any objections, please let me know.
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From: Filipe Manana fdmanana@suse.com
commit bfe3d755ef7cec71aac6ecda34a107624735aac7 upstream.
When logging that a new name exists, we skip updating the inode's last_log_commit field to prevent a later explicit fsync against the inode from doing nothing (as updating last_log_commit makes btrfs_inode_in_log() return true). We are detecting, at btrfs_log_inode(), that logging a new name is happening by checking the logging mode is not LOG_INODE_EXISTS, but that is not enough because we may log parent directories when logging a new name of a file in LOG_INODE_ALL mode - we need to check that the logging_new_name field of the log context too.
An example scenario where this results in an explicit fsync against a directory not persisting changes to the directory is the following:
$ mkfs.btrfs -f /dev/sdc $ mount /dev/sdc /mnt
$ touch /mnt/foo
$ sync
$ mkdir /mnt/dir
# Write some data to our file and fsync it. $ xfs_io -c "pwrite -S 0xab 0 64K" -c "fsync" /mnt/foo
# Add a new link to our file. Since the file was logged before, we # update it in the log tree by calling btrfs_log_new_name(). $ ln /mnt/foo /mnt/dir/bar
# fsync the root directory - we expect it to persist the dentry for # the new directory "dir". $ xfs_io -c "fsync" /mnt
<power fail>
After mounting the fs the entry for directory "dir" does not exists, despite the explicit fsync on the root directory.
Here's why this happens:
1) When we fsync the file we log the inode, so that it's present in the log tree;
2) When adding the new link we enter btrfs_log_new_name(), and since the inode is in the log tree we proceed to updating the inode in the log tree;
3) We first set the inode's last_unlink_trans to the current transaction (early in btrfs_log_new_name());
4) We then eventually enter btrfs_log_inode_parent(), and after logging the file's inode, we call btrfs_log_all_parents() because the inode's last_unlink_trans matches the current transaction's ID (updated in the previous step);
5) So btrfs_log_all_parents() logs the root directory by calling btrfs_log_inode() for the root's inode with a log mode of LOG_INODE_ALL so that new dentries are logged;
6) At btrfs_log_inode(), because the log mode is LOG_INODE_ALL, we update root inode's last_log_commit to the last transaction that changed the inode (->last_sub_trans field of the inode), which corresponds to the current transaction's ID;
7) Then later when user space explicitly calls fsync against the root directory, we enter btrfs_sync_file(), which calls skip_inode_logging() and that returns true, since its call to btrfs_inode_in_log() returns true and there are no ordered extents (it's a directory, never has ordered extents). This results in btrfs_sync_file() returning without syncing the log or committing the current transaction, so all the updates we did when logging the new name, including logging the root directory, are not persisted.
So fix this by but updating the inode's last_log_commit if we are sure we are not logging a new name (if ctx->logging_new_name is false).
A test case for fstests will follow soon.
Reported-by: Vyacheslav Kovalevsky slava.kovalevskiy.2014@gmail.com Link: https://lore.kernel.org/linux-btrfs/03c5d7ec-5b3d-49d1-95bc-8970a7f82d87@gma... Fixes: 130341be7ffa ("btrfs: always update the logged transaction when logging new names") CC: stable@vger.kernel.org # 6.1+ Signed-off-by: Filipe Manana fdmanana@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/btrfs/tree-log.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -6765,7 +6765,7 @@ log_extents: * a power failure unless the log was synced as part of an fsync * against any other unrelated inode. */ - if (inode_only != LOG_INODE_EXISTS) + if (!ctx->logging_new_name && inode_only != LOG_INODE_EXISTS) inode->last_log_commit = inode->last_sub_trans; spin_unlock(&inode->lock);