From: Christoph Hellwig <hch@infradead.org>
Date: Mon, 19 May 2008 06:34:42 +0000 (+1000)
Subject: [XFS] Fix memory corruption with small buffer reads
X-Git-Tag: v2.6.26-rc4~62^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6ab455eeaff6893cd06da33843e840d888cdc04a;p=pandora-kernel.git

[XFS] Fix memory corruption with small buffer reads

When we have multiple buffers in a single page for a blocksize == pagesize
filesystem we might overwrite the page contents if two callers hit it
shortly after each other. To prevent that we need to keep the page locked
until I/O is completed and the page marked uptodate.

Thanks to Eric Sandeen for triaging this bug and finding a reproducible
testcase and Dave Chinner for additional advice.

This should fix kernel.org bz #10421.

Tested-by: Eric Sandeen <sandeen@sandeen.net>

SGI-PV: 981813
SGI-Modid: xfs-linux-melb:xfs-kern:31173a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
---

Reading git-diff-tree failed