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authorBart Van Assche <bvanassche@acm.org>2019-08-01 15:50:42 -0700
committerJens Axboe <axboe@kernel.dk>2019-08-04 21:41:29 -0600
commitff9811b3cf2092fe6c39cf694e5e7f949f3b2c16 (patch)
treef61263180210bb5edf1294aa76ef37669928453b /block/blk-merge.c
parentdad7758459bc6097115f5e783eda232f36b1ad99 (diff)
block: Simplify bvec_split_segs()
Simplify this function by by removing two if-tests. Other than requiring that the @sectors pointer is not NULL, this patch does not change the behavior of bvec_split_segs(). Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Ming Lei <ming.lei@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-merge.c')
-rw-r--r--block/blk-merge.c16
1 files changed, 7 insertions, 9 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 51ed971709c3..7cea5050bbcf 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -167,17 +167,17 @@ static bool bvec_split_segs(const struct request_queue *q,
{
unsigned len = bv->bv_len;
unsigned total_len = 0;
- unsigned new_nsegs = 0, seg_size = 0;
+ unsigned seg_size = 0;
/*
* Multi-page bvec may be too big to hold in one segment, so the
* current bvec has to be splitted as multiple segments.
*/
- while (len && new_nsegs + *nsegs < max_segs) {
+ while (len && *nsegs < max_segs) {
seg_size = get_max_segment_size(q, bv->bv_offset + total_len);
seg_size = min(seg_size, len);
- new_nsegs++;
+ (*nsegs)++;
total_len += seg_size;
len -= seg_size;
@@ -185,11 +185,7 @@ static bool bvec_split_segs(const struct request_queue *q,
break;
}
- if (new_nsegs) {
- *nsegs += new_nsegs;
- if (sectors)
- *sectors += total_len >> 9;
- }
+ *sectors += total_len >> 9;
/* split in the middle of the bvec if len != 0 */
return !!len;
@@ -349,6 +345,7 @@ EXPORT_SYMBOL(blk_queue_split);
unsigned int blk_recalc_rq_segments(struct request *rq)
{
unsigned int nr_phys_segs = 0;
+ unsigned int nr_sectors = 0;
struct req_iterator iter;
struct bio_vec bv;
@@ -365,7 +362,8 @@ unsigned int blk_recalc_rq_segments(struct request *rq)
}
rq_for_each_bvec(bv, rq, iter)
- bvec_split_segs(rq->q, &bv, &nr_phys_segs, NULL, UINT_MAX);
+ bvec_split_segs(rq->q, &bv, &nr_phys_segs, &nr_sectors,
+ UINT_MAX);
return nr_phys_segs;
}