From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 8 May 2009 20:05:57 +0000 (-0400)
Subject: Fix races around the access to ->s_options
X-Git-Tag: linux-omap-v2.6.30-rc6~44^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2a32cebd6cbcc43996c3e2d114fa32ba1e71192a;p=pandora-kernel.git

Fix races around the access to ->s_options

Put generic_show_options read access to s_options under rcu_read_lock,
split save_mount_options() into "we are setting it the first time"
(uses in foo_fill_super()) and "we are relacing and freeing the old one",
synchronize_rcu() before kfree() in the latter.

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