btrfs: update target inode's ctime on unlink

[ Upstream commit 3bc2ac2f8f0b78a13140fc72022771efe0c9b778 ]

Unlink changes the link count on the target inode. POSIX mandates that
the ctime must also change when this occurs.

According to https://pubs.opengroup.org/onlinepubs/9699919799/functions/unlink.html:

"Upon successful completion, unlink() shall mark for update the last data
 modification and last file status change timestamps of the parent
 directory. Also, if the file's link count is not 0, the last file status
 change timestamp of the file shall be marked for update."

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: David Sterba <dsterba@suse.com>
[ add link to the opengroup docs ]
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index cd3156a9a268dfabb1e8788795376113e9ebb4fd..24598acb9a3140fd1ce4c9f656771cbfb23cc3a2 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3704,6 +3704,7 @@ err:
 
        btrfs_i_size_write(dir, dir->vfs_inode.i_size - name_len * 2);
        inode_inc_iversion(&inode->vfs_inode);
+       inode_set_ctime_current(&inode->vfs_inode);
        inode_inc_iversion(&dir->vfs_inode);
        inode->vfs_inode.i_ctime = dir->vfs_inode.i_mtime =
                dir->vfs_inode.i_ctime = current_time(&inode->vfs_inode);