Commit 6952a7f8 authored Nov 08, 2019 by Ming Lei Committed by Jens Axboe Nov 08, 2019

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: fa532287 (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>

parent 59db8ba2

block/blk-merge.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;
		}

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