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block: move the call to get_max_io_size out of blk_bio_segment_split

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Prepare for reusing blk_bio_segment_split for (file system controlled)
splits of REQ_OP_ZONE_APPEND bios by letting the caller control the
maximum size of the bio.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20220727162300.3089193-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-07-27 12:22:58 -04:00 committed by Jens Axboe
parent 46754bd056
commit a85b36375b
1 changed files with 5 additions and 4 deletions
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9
block/blk-merge.c
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@ -250,11 +250,12 @@ static bool bvec_split_segs(const struct request_queue *q,
* @q: [in] request queue pointer
* @segs: [out] number of segments in the bio with the first half of the sectors
* @bs: [in] bio set to allocate the clone from
* @max_bytes: [in] maximum number of bytes per bio
*
* Clone @bio, update the bi_iter of the clone to represent the first sectors
* of @bio and update @bio->bi_iter to represent the remaining sectors. The
* following is guaranteed for the cloned bio:
* - That it has at most get_max_io_size(@bio, @q) sectors.
* - That it has at most @max_bytes worth of data
* - That it has at most queue_max_segments(@q) segments.
*
* Except for discard requests the cloned bio will point at the bi_io_vec of
@ -264,12 +265,11 @@ static bool bvec_split_segs(const struct request_queue *q,
* split bio has finished.
*/
static struct bio *bio_split_rw(struct bio *bio, struct request_queue *q,
unsigned *segs, struct bio_set *bs)
unsigned *segs, struct bio_set *bs, unsigned max_bytes)
{
struct bio_vec bv, bvprv, *bvprvp = NULL;
struct bvec_iter iter;
unsigned nsegs = 0, bytes = 0;
const unsigned max_bytes = get_max_io_size(bio, q) << 9;
const unsigned max_segs = queue_max_segments(q);
bio_for_each_bvec(bv, bio, iter) {
@ -343,7 +343,8 @@ struct bio *__bio_split_to_limits(struct bio *bio, struct request_queue *q,
split = bio_split_write_zeroes(bio, q, nr_segs, bs);
break;
default:
split = bio_split_rw(bio, q, nr_segs, bs);
split = bio_split_rw(bio, q, nr_segs, bs,
get_max_io_size(bio, q) << SECTOR_SHIFT);
break;
}