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| author | Christoph Hellwig <hch@lst.de> | 2017-04-05 19:21:01 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-04-08 11:25:38 -0600 |
| commit | 885fa13f655940c73787b7fcd4c78813943ece8a (patch) | |
| tree | eb61bdafcea7368813ecde3315ad456a8bf61d34 /block/blk-merge.c | |
| parent | 1d62ac13634840e02f9b20df9d8e21204f9ab8b8 (diff) | |
| download | linux-885fa13f655940c73787b7fcd4c78813943ece8a.tar.gz linux-885fa13f655940c73787b7fcd4c78813943ece8a.tar.bz2 linux-885fa13f655940c73787b7fcd4c78813943ece8a.zip | |
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: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-merge.c')
| -rw-r--r-- | block/blk-merge.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c index 2afa262425d1..3990ae406341 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -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); |