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block: split bio if the only bvec's length is > SZ_4K 

64K PAGE_SIZE is popular on ARM64 or other ARCHs, and 64K has been big
enough to break some devices probably, so change the logic to split bio
if the only bvec's length is > SZ_4K instead of PAGE_SIZE.

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 18:15:28 +08:00 committed by Jens Axboe
parent 59db8ba2f6
commit 6952a7f844
1 changed files with 1 additions and 1 deletions
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block/blk-merge.c
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@ -320,7 +320,7 @@ 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 +
(*bio)->bi_io_vec[0].bv_offset) <= PAGE_SIZE) {
(*bio)->bi_io_vec[0].bv_offset) <= SZ_4K) {
*nr_segs = 1;
break;
}