From: Theodore Ts'o <tytso@mit.edu>
Date: Thu, 28 Oct 2010 21:33:57 +0000 (-0400)
Subject: ext4: BUG_ON fix: check if page has buffers before calling page_buffers()
X-Git-Tag: v2.6.37-rc1~54^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b1142e8fec6a594723e5054055a7b53379b90490;p=pandora-kernel.git

ext4: BUG_ON fix: check if page has buffers before calling page_buffers()

We need to make check if a page does not have buffes by checking
page_has_buffers(page) before calling page_buffers(page) in
ext4_writepage().  Otherwise page_buffers() could throw a BUG_ON.

Thanks also to Markus Trippelsdorf and Avinash Kurup who also reported
the problem.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reported-by: Sedat Dilek <sedat.dilek@googlemail.com>
Tested-by: Sedat Dilek <sedat.dilek@googlemail.com>
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