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authorDmitry Monakhov <dmonakhov@openvz.org>2010-01-27 22:44:36 +0300
committerJens Axboe <jens.axboe@oracle.com>2010-01-28 15:08:29 +0100
commit1d6165851cd8e3f919d446cd6da35dee44e8837e (patch)
treea9d68cfc0e838490d12963aa917ef78a54ae2073 /block
parentc84a301d4a4b1cc382a6549b4e7881ce5b796d63 (diff)
block: fix bio_add_page for non trivial merge_bvec_fn case
We have to properly decrease bi_size in order to merge_bvec_fn return right result. Otherwise this result in false merge rejects for two absolutely valid bio_vecs. This may cause significant performance penalty for example fs_block_size == 1k and block device is raid0 with small chunk_size = 8k. Then it is impossible to merge 7-th fs-block in to bio which already has 6 fs-blocks. Cc: <stable@kernel.org> Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block')
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