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@xxxxxx>
Reviewed-by: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
---
block/blk-merge.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 83a9d23f2a333..509ee8b5d3e1d 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -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;
}
--
2.30.2
