From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 17 Nov 2011 02:43:59 +0000 (-0500)
Subject: new helper: mount_subtree()
X-Git-Tag: v3.2-rc3~32^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ea441d1104cf1efb471fa81bc91e9fd1e6ae29fd;p=pandora-kernel.git

new helper: mount_subtree()

takes vfsmount and relative path, does lookup within that vfsmount
(possibly triggering automounts) and returns the result as root
of subtree suitable for return by ->mount() (i.e. a reference to
dentry and an active reference to its superblock grabbed, superblock
locked exclusive).

btrfs and nfs switched to it instead of open-coding the sucker.

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