tree a6f3df6f19d27e81f35a93f8858b73bd4273f420
parent 1ba50bbe93ebb98e83b174a85eff76af430c4e5b
author Christoph Hellwig <hch@lst.de> 1249334886 +0200
committer Al Viro <viro@zeniv.linux.org.uk> 1253792859 -0400

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>