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block: still try to split bio if the bvec crosses pages 

Some device may set segment boundary as PAGE_SIZE - 1. If the bvec
crosses pages, and meantime its length is <= PAGE_SIZE, we still need
to split the bvec into 2 segments.

Fixes this issue by still splitting bio if the single bvec crosses
pages.

Reported-by: kernel test robot <lkp@intel.com>
Fixes: fa53228721 (block: avoid blk_bio_segment_split for small I/O operations)
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2019-11-08 18:15:27 +08:00 committed by Jens Axboe
parent 1d156646e0
commit 59db8ba2f6
1 changed files with 2 additions and 1 deletions
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3
block/blk-merge.c
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@ -319,7 +319,8 @@ void __blk_queue_split(struct request_queue *q, struct bio **bio,
*/
if (!q->limits.chunk_sectors &&
(*bio)->bi_vcnt == 1 &&
(*bio)->bi_io_vec[0].bv_len <= PAGE_SIZE) {
((*bio)->bi_io_vec[0].bv_len +
(*bio)->bi_io_vec[0].bv_offset) <= PAGE_SIZE) {
*nr_segs = 1;
break;
}