tree e7744d1580647ca3b08e829bcf976f2f60c49986
parent c8f5f12e46f079a954d4f7163ba59dadee08ca26
author Christoph Hellwig <hch@infradead.org> 1211178882 +1000
committer Lachlan McIlroy <lachlan@redback.melbourne.sgi.com> 1211530369 +1000

[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>