From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 24 Nov 2011 00:26:23 +0000 (-0500)
Subject: vfs: new internal helper: mnt_has_parent(mnt)
X-Git-Tag: v3.3-rc1~170^2~79
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b2dba1af3c4157040303a76d25216b1713d333d0;p=pandora-kernel.git

vfs: new internal helper: mnt_has_parent(mnt)

vfsmounts have ->mnt_parent pointing either to a different vfsmount
or to itself; it's never NULL and termination condition in loops
traversing the tree towards root is mnt == mnt->mnt_parent.  At least
one place (see the next patch) is confused about what's going on;
let's add an explicit helper checking it right way and use it in
all places where we need it.  Not that there had been too many,
but...

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