From: Allison Henderson <achender@linux.vnet.ibm.com>
Date: Wed, 7 Sep 2011 01:53:01 +0000 (-0400)
Subject: ext4: fix partial page writes
X-Git-Tag: v3.2-rc1~85^2~83
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=02fac1297eb3f471a27368271aadd285548297b0;p=pandora-kernel.git

ext4: fix partial page writes

While running extended fsx tests to verify the preceeding patches,
a similar bug was also found in the write operation

When ever a write operation begins or ends in a hole,
or extends EOF, the partial page contained in the hole
or beyond EOF needs to be zeroed out.

To correct this the new ext4_discard_partial_page_buffers_no_lock
routine is used to zero out the partial page, but only for buffer
heads that are already unmapped.

Signed-off-by: Allison Henderson <achender@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---

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