freeze_bdev: kill bd_mount_sem

Now that we have the freeze count there is not much reason for bd_mount_sem
anymore.  The actual freeze/thaw operations are serialized using the
bd_fsfreeze_mutex, and the only other place we take bd_mount_sem is
get_sb_bdev which tries to prevent mounting a filesystem while the block
device is frozen.  Instead of add a check for bd_fsfreeze_count and
return -EBUSY if a filesystem is frozen.  While that is a change in user
visible behaviour a failing mount is much better for this case rather
than having the mount process stuck uninterruptible for a long time.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 0 insertions, 1 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index cbb7724c11d..72dfbd42397 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -640,7 +640,6 @@ struct block_device {
         struct super_block *    bd_super;
         int                     bd_openers;
         struct mutex            bd_mutex;       /* open/close mutex */
-        struct semaphore        bd_mount_sem;
         struct list_head        bd_inodes;
         void *                  bd_holder;
         int                     bd_holders;