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block: simplify blk_recalc_rq_segments 

Return the segement and let the callers assign them, which makes the code
a littler more obvious.  Also pass the request instead of q plus bio
chain, allowing for the use of rq_for_each_bvec.

Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2019-06-06 12:29:02 +02:00 committed by Jens Axboe
parent 14ccb66b3f
commit e9cd19c0c1
3 changed files with 9 additions and 18 deletions
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4
block/blk-core.c
View File

@ -1152,7 +1152,7 @@ static int blk_cloned_rq_check_limits(struct request_queue *q,
* Recalculate it to check the request correctly on this queue's
* limitation.
*/
blk_recalc_rq_segments(rq);
rq->nr_phys_segments = blk_recalc_rq_segments(rq);
if (rq->nr_phys_segments > queue_max_segments(q)) {
printk(KERN_ERR "%s: over max segments limit. (%hu > %hu)\n",
__func__, rq->nr_phys_segments, queue_max_segments(q));
@ -1421,7 +1421,7 @@ bool blk_update_request(struct request *req, blk_status_t error,
}
/* recalculate the number of segments */
blk_recalc_rq_segments(req);
req->nr_phys_segments = blk_recalc_rq_segments(req);
}
return true;

21
block/blk-merge.c
View File

@ -310,17 +310,16 @@ void blk_queue_split(struct request_queue *q, struct bio **bio)
}
EXPORT_SYMBOL(blk_queue_split);
static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
struct bio *bio)
unsigned int blk_recalc_rq_segments(struct request *rq)
{
unsigned int nr_phys_segs = 0;
struct bvec_iter iter;
struct req_iterator iter;
struct bio_vec bv;
if (!bio)
if (!rq->bio)
return 0;
switch (bio_op(bio)) {
switch (bio_op(rq->bio)) {
case REQ_OP_DISCARD:
case REQ_OP_SECURE_ERASE:
case REQ_OP_WRITE_ZEROES:
@ -329,19 +328,11 @@ static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
return 1;
}
for_each_bio(bio) {
bio_for_each_bvec(bv, bio, iter)
bvec_split_segs(q, &bv, &nr_phys_segs, NULL, UINT_MAX);
}
rq_for_each_bvec(bv, rq, iter)
bvec_split_segs(rq->q, &bv, &nr_phys_segs, NULL, UINT_MAX);
return nr_phys_segs;
}
void blk_recalc_rq_segments(struct request *rq)
{
rq->nr_phys_segments = __blk_recalc_rq_segments(rq->q, rq->bio);
}
static inline struct scatterlist *blk_next_sg(struct scatterlist **sg,
struct scatterlist *sglist)
{

2
block/blk.h
View File

@ -211,7 +211,7 @@ struct request *attempt_back_merge(struct request_queue *q, struct request *rq);
struct request *attempt_front_merge(struct request_queue *q, struct request *rq);
int blk_attempt_req_merge(struct request_queue *q, struct request *rq,
struct request *next);
void blk_recalc_rq_segments(struct request *rq);
unsigned int blk_recalc_rq_segments(struct request *rq);
void blk_rq_set_mixed_merge(struct request *rq);
bool blk_rq_merge_ok(struct request *rq, struct bio *bio);
enum elv_merge blk_try_merge(struct request *rq, struct bio *bio);