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Commit 885fa13f authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

block: implement splitting of REQ_OP_WRITE_ZEROES bios 



Copy and past the REQ_OP_WRITE_SAME code to prepare to implementations
that limit the write zeroes size.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 1d62ac13

block/blk-merge.c

+15 −2
Original line number Diff line number Diff line
@@ -54,6 +54,20 @@ static struct bio *blk_bio_discard_split(struct request_queue *q, 
	return bio_split(bio, split_sectors, GFP_NOIO, bs);

}



static struct bio *blk_bio_write_zeroes_split(struct request_queue *q,

		struct bio *bio, struct bio_set *bs, unsigned *nsegs)

{

	*nsegs = 1;



	if (!q->limits.max_write_zeroes_sectors)

		return NULL;



	if (bio_sectors(bio) <= q->limits.max_write_zeroes_sectors)

		return NULL;



	return bio_split(bio, q->limits.max_write_zeroes_sectors, GFP_NOIO, bs);

}



static struct bio *blk_bio_write_same_split(struct request_queue *q,

					    struct bio *bio,

					    struct bio_set *bs,
@@ -200,8 +214,7 @@ void blk_queue_split(struct request_queue *q, struct bio **bio, 
		split = blk_bio_discard_split(q, *bio, bs, &nsegs);

		break;

	case REQ_OP_WRITE_ZEROES:

		split = NULL;

		nsegs = (*bio)->bi_phys_segments;

		split = blk_bio_write_zeroes_split(q, *bio, bs, &nsegs);

		break;

	case REQ_OP_WRITE_SAME:

		split = blk_bio_write_same_split(q, *bio, bs, &nsegs);