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authorChristoph Hellwig <hch@infradead.org>2008-05-19 16:34:42 +1000
committerLachlan McIlroy <lachlan@redback.melbourne.sgi.com>2008-05-23 18:12:49 +1000
commit6ab455eeaff6893cd06da33843e840d888cdc04a (patch)
treee7744d1580647ca3b08e829bcf976f2f60c49986 /fs/drop_caches.c
parentc8f5f12e46f079a954d4f7163ba59dadee08ca26 (diff)
downloadop-kernel-dev-6ab455eeaff6893cd06da33843e840d888cdc04a.zip
op-kernel-dev-6ab455eeaff6893cd06da33843e840d888cdc04a.tar.gz
[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>
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