From: Huang Ying <ying.huang@intel.com>
Date: Fri, 12 Sep 2014 11:21:11 +0000 (+0800)
Subject: f2fs: fix a race condition in next_free_nid
X-Git-Tag: fixes-for-v3.18-merge-window~8^2~26
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c6e489305eb5ed029002b037e36800032a994bb4;p=pandora-kernel.git

f2fs: fix a race condition in next_free_nid

The nm_i->fcnt checking is executed before spin_lock, so if another
thread delete the last free_nid from the list, the wrong nid may be
gotten.  So fix the race condition by moving the nm_i->fnct checking
into spin_lock.

Signed-off-by: Huang, Ying <ying.huang@intel.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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