new helpers: lock_mount_hash/unlock_mount_hash
authorAl Viro <viro@zeniv.linux.org.uk>
Sun, 29 Sep 2013 15:24:49 +0000 (11:24 -0400)
committerAl Viro <viro@zeniv.linux.org.uk>
Fri, 25 Oct 2013 03:34:59 +0000 (23:34 -0400)
aka br_write_{lock,unlock} of vfsmount_lock.  Inlines in fs/mount.h,
vfsmount_lock extern moved over there as well.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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