From: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 4 May 2015 00:01:27 +0000 (-0400)
Subject: link_path_walk: nd->depth massage, part 1
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~213^2~79
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=071bf501379560a7631b8d75ac80165bf82735c4;p=pandora-kernel.git

link_path_walk: nd->depth massage, part 1

nd->stack[0] is unused until the handling of trailing symlinks and
we want to get rid of that.  Having fucked that transformation up
several times, I went for bloody pedantic series of provably equivalent
transformations.  Sorry.

Step 1: keep nd->depth higher by one in link_path_walk() - increment upon
entry, decrement on exits, adjust the arithmetics inside and surround the
calls of functions that care about nd->depth value (nd_alloc_stack(),
get_link(), put_link()) with decrement/increment pairs.

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