From: Yongqiang Yang <xiaoqiangnk@gmail.com>
Date: Wed, 14 Dec 2011 02:51:55 +0000 (-0500)
Subject: ext4: avoid potential hang in mpage_submit_io() when blocksize < pagesize
X-Git-Tag: v3.2-rc6~16^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=13a79a4741d37fda2fbafb953f0f301dc007928f;p=pandora-kernel.git

ext4: avoid potential hang in mpage_submit_io() when blocksize < pagesize

If there is an unwritten but clean buffer in a page and there is a
dirty buffer after the buffer, then mpage_submit_io does not write the
dirty buffer out.  As a result, da_writepages loops forever.

This patch fixes the problem by checking dirty flag.

Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
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