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authorJens Axboe <jens.axboe@oracle.com>2007-06-19 09:09:27 +0200
committerJens Axboe <jens.axboe@oracle.com>2007-07-10 08:03:32 +0200
commit32eef964110985c5845472e07fa0a18838a970c4 (patch)
tree69a96d9757c72800e3d6479927e00316a4483361 /block/ll_rw_blk.c
parent7deeed13170e634adc4552ff94588d6301a3da83 (diff)
downloadlinux-2.6.34-ux500-32eef964110985c5845472e07fa0a18838a970c4.tar.gz
blk_hw_contig_segment(): bad segment size checks
Two bugs in there: - The virt oversize check should use the current bio hardware back size and the next bio front size, not the same bio. Spotted by Neil Brown. - The segment size check should add hw front sizes, not total bio sizes. Spotted by James Bottomley Acked-by: James Bottomley <James.Bottomley@SteelEye.com> Acked-by: NeilBrown <neilb@suse.de> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/ll_rw_blk.c')
-rw-r--r--block/ll_rw_blk.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index c99b4635485..3e7801e4903 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -1304,9 +1304,9 @@ static int blk_hw_contig_segment(request_queue_t *q, struct bio *bio,
if (unlikely(!bio_flagged(nxt, BIO_SEG_VALID)))
blk_recount_segments(q, nxt);
if (!BIOVEC_VIRT_MERGEABLE(__BVEC_END(bio), __BVEC_START(nxt)) ||
- BIOVEC_VIRT_OVERSIZE(bio->bi_hw_front_size + bio->bi_hw_back_size))
+ BIOVEC_VIRT_OVERSIZE(bio->bi_hw_back_size + nxt->bi_hw_front_size))
return 0;
- if (bio->bi_size + nxt->bi_size > q->max_segment_size)
+ if (bio->bi_hw_back_size + nxt->bi_hw_front_size > q->max_segment_size)
return 0;
return 1;