[PATCH] Revert bd_mount_mutex back to a semaphore

Revert bd_mount_mutex back to a semaphore so that xfs_freeze -f /mnt/newtest;
xfs_freeze -u /mnt/newtest works safely and doesn't produce lockdep warnings.

(XFS unlocks the semaphore from a different task, by design.  The mutex
code warns about this)

Signed-off-by: Dave Chinner <dgc@sgi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/super.c b/fs/super.c
index f961e0307997..3e7458c2bb76 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -753,9 +753,9 @@ int get_sb_bdev(struct file_system_type *fs_type,
          * will protect the lockfs code from trying to start a snapshot
          * while we are mounting
          */
-        mutex_lock(&bdev->bd_mount_mutex);
+        down(&bdev->bd_mount_sem);
         s = sget(fs_type, test_bdev_super, set_bdev_super, bdev);
-        mutex_unlock(&bdev->bd_mount_mutex);
+        up(&bdev->bd_mount_sem);
         if (IS_ERR(s))
                 goto error_s;