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

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
...@@ -54,6 +54,20 @@ static struct bio *blk_bio_discard_split(struct request_queue *q, ...@@ -54,6 +54,20 @@ static struct bio *blk_bio_discard_split(struct request_queue *q,
return bio_split(bio, split_sectors, GFP_NOIO, bs); 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, static struct bio *blk_bio_write_same_split(struct request_queue *q,
struct bio *bio, struct bio *bio,
struct bio_set *bs, struct bio_set *bs,
...@@ -200,8 +214,7 @@ void blk_queue_split(struct request_queue *q, struct bio **bio, ...@@ -200,8 +214,7 @@ void blk_queue_split(struct request_queue *q, struct bio **bio,
split = blk_bio_discard_split(q, *bio, bs, &nsegs); split = blk_bio_discard_split(q, *bio, bs, &nsegs);
break; break;
case REQ_OP_WRITE_ZEROES: case REQ_OP_WRITE_ZEROES:
split = NULL; split = blk_bio_write_zeroes_split(q, *bio, bs, &nsegs);
nsegs = (*bio)->bi_phys_segments;
break; break;
case REQ_OP_WRITE_SAME: case REQ_OP_WRITE_SAME:
split = blk_bio_write_same_split(q, *bio, bs, &nsegs); split = blk_bio_write_same_split(q, *bio, bs, &nsegs);
......
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