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block: drop virtual merging accounting

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Remove virtual merge accounting.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Mikulas Patocka
2008-08-15 10:15:19 +02:00
committed by Jens Axboe
parent 6a421c1dc9
commit b8b3e16cfe
3 changed files with 8 additions and 92 deletions
Download Patch File Download Diff File Expand all files Collapse all files
block/blk-merge.c
+6 -73
View File
@@ -66,7 +66,7 @@ void blk_recalc_rq_segments(struct request *rq)
*/
high = page_to_pfn(bv->bv_page) > q->bounce_pfn;
if (high || highprv)
goto new_hw_segment;
goto new_segment;
if (cluster) {
if (seg_size + bv->bv_len > q->max_segment_size)
goto new_segment;
@@ -74,8 +74,6 @@ void blk_recalc_rq_segments(struct request *rq)
goto new_segment;
if (!BIOVEC_SEG_BOUNDARY(q, bvprv, bv))
goto new_segment;
if (BIOVEC_VIRT_OVERSIZE(hw_seg_size + bv->bv_len))
goto new_hw_segment;
seg_size += bv->bv_len;
hw_seg_size += bv->bv_len;
@@ -83,17 +81,11 @@ void blk_recalc_rq_segments(struct request *rq)
continue;
}
new_segment:
if (BIOVEC_VIRT_MERGEABLE(bvprv, bv) &&
!BIOVEC_VIRT_OVERSIZE(hw_seg_size + bv->bv_len))
hw_seg_size += bv->bv_len;
else {
new_hw_segment:
if (nr_hw_segs == 1 &&
hw_seg_size > rq->bio->bi_hw_front_size)
rq->bio->bi_hw_front_size = hw_seg_size;
hw_seg_size = BIOVEC_VIRT_START_SIZE(bv) + bv->bv_len;
nr_hw_segs++;
}
if (nr_hw_segs == 1 &&
hw_seg_size > rq->bio->bi_hw_front_size)
rq->bio->bi_hw_front_size = hw_seg_size;
hw_seg_size = bv->bv_len;
nr_hw_segs++;
nr_phys_segs++;
bvprv = bv;
@@ -150,23 +142,6 @@ static int blk_phys_contig_segment(struct request_queue *q, struct bio *bio,
return 0;
}
static int blk_hw_contig_segment(struct request_queue *q, struct bio *bio,
struct bio *nxt)
{
if (!bio_flagged(bio, BIO_SEG_VALID))
blk_recount_segments(q, bio);
if (!bio_flagged(nxt, BIO_SEG_VALID))
blk_recount_segments(q, nxt);
if (bio_has_data(bio) &&
(!BIOVEC_VIRT_MERGEABLE(__BVEC_END(bio), __BVEC_START(nxt)) ||
BIOVEC_VIRT_OVERSIZE(bio->bi_hw_back_size + nxt->bi_hw_front_size)))
return 0;
if (bio->bi_hw_back_size + nxt->bi_hw_front_size > q->max_segment_size)
return 0;
return 1;
}
/*
* map a request to scatterlist, return number of sg entries setup. Caller
* must make sure sg can hold rq->nr_phys_segments entries
@@ -304,7 +279,6 @@ int ll_back_merge_fn(struct request_queue *q, struct request *req,
struct bio *bio)
{
unsigned short max_sectors;
int len;
if (unlikely(blk_pc_request(req)))
max_sectors = q->max_hw_sectors;
@@ -321,20 +295,6 @@ int ll_back_merge_fn(struct request_queue *q, struct request *req,
blk_recount_segments(q, req->biotail);
if (!bio_flagged(bio, BIO_SEG_VALID))
blk_recount_segments(q, bio);
len = req->biotail->bi_hw_back_size + bio->bi_hw_front_size;
if (!bio_has_data(bio) ||
(BIOVEC_VIRT_MERGEABLE(__BVEC_END(req->biotail), __BVEC_START(bio))
&& !BIOVEC_VIRT_OVERSIZE(len))) {
int mergeable = ll_new_mergeable(q, req, bio);
if (mergeable) {
if (req->nr_hw_segments == 1)
req->bio->bi_hw_front_size = len;
if (bio->bi_hw_segments == 1)
bio->bi_hw_back_size = len;
}
return mergeable;
}
return ll_new_hw_segment(q, req, bio);
}
@@ -343,7 +303,6 @@ int ll_front_merge_fn(struct request_queue *q, struct request *req,
struct bio *bio)
{
unsigned short max_sectors;
int len;
if (unlikely(blk_pc_request(req)))
max_sectors = q->max_hw_sectors;
@@ -357,24 +316,10 @@ int ll_front_merge_fn(struct request_queue *q, struct request *req,
q->last_merge = NULL;
return 0;
}
len = bio->bi_hw_back_size + req->bio->bi_hw_front_size;
if (!bio_flagged(bio, BIO_SEG_VALID))
blk_recount_segments(q, bio);
if (!bio_flagged(req->bio, BIO_SEG_VALID))
blk_recount_segments(q, req->bio);
if (!bio_has_data(bio) ||
(BIOVEC_VIRT_MERGEABLE(__BVEC_END(bio), __BVEC_START(req->bio)) &&
!BIOVEC_VIRT_OVERSIZE(len))) {
int mergeable = ll_new_mergeable(q, req, bio);
if (mergeable) {
if (bio->bi_hw_segments == 1)
bio->bi_hw_front_size = len;
if (req->nr_hw_segments == 1)
req->biotail->bi_hw_back_size = len;
}
return mergeable;
}
return ll_new_hw_segment(q, req, bio);
}
@@ -406,18 +351,6 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
return 0;
total_hw_segments = req->nr_hw_segments + next->nr_hw_segments;
if (blk_hw_contig_segment(q, req->biotail, next->bio)) {
int len = req->biotail->bi_hw_back_size +
next->bio->bi_hw_front_size;
/*
* propagate the combined length to the end of the requests
*/
if (req->nr_hw_segments == 1)
req->bio->bi_hw_front_size = len;
if (next->nr_hw_segments == 1)
next->biotail->bi_hw_back_size = len;
total_hw_segments--;
}
if (total_hw_segments > q->max_hw_segments)
return 0;