[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/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index d14e139d2674..ee80b8a5e7bc 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -867,9 +867,9 @@ static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
                 error = -EBUSY;
                 goto error;
         }
-        mutex_lock(&sb->s_bdev->bd_mount_mutex);
+        down(&sb->s_bdev->bd_mount_sem);
         new = sget(fs_type, test_bdev_super, set_bdev_super, sb->s_bdev);
-        mutex_unlock(&sb->s_bdev->bd_mount_mutex);
+        up(&sb->s_bdev->bd_mount_sem);
         if (IS_ERR(new)) {
                 error = PTR_ERR(new);
                 goto error;