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| author | Bart Van Assche <bvanassche@acm.org> | 2019-08-02 00:50:42 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-08-05 05:41:29 +0200 |
| commit | ff9811b3cf2092fe6c39cf694e5e7f949f3b2c16 (patch) | |
| tree | f61263180210bb5edf1294aa76ef37669928453b /block/blk-merge.c | |
| parent | block: Document the bio splitting functions (diff) | |
| download | linux-ff9811b3cf2092fe6c39cf694e5e7f949f3b2c16.tar.xz linux-ff9811b3cf2092fe6c39cf694e5e7f949f3b2c16.zip | |
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.c | 16 |
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; } |