[PATCH RFC v2 06/18] ocfs2: don't reset s_dev on dismount

[Christian Brauner <brauner@kernel.org>]

ocfs2_dismount_volume() has reset sb->s_dev to zero since the original
merge in ccd979bdbce9 ("[PATCH] OCFS2: The Second Oracle Cluster
Filesystem") as part of scrubbing the super_block. Nothing reads the
field afterwards: all ocfs2-internal uses are mount-time log and trace
prints, and dev_t-keyed superblock lookups skip a dying superblock
anyway - s_root is gone before ->put_super runs and super_lock()
refuses SB_DYING superblocks.

The upcoming device-to-superblock table registers every superblock
under its s_dev. Drop the reset instead of leaving a superblock around
whose s_dev contradicts its registration.

Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
---
 fs/ocfs2/super.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 4870e680c4e5..df9ebff25dab 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -1882,7 +1882,6 @@ static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
 
 	ocfs2_delete_osb(osb);
 	kfree(osb);
-	sb->s_dev = 0;
 	sb->s_fs_info = NULL;
 }
 

-- 
2.47.3