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OpenCloudOS-Kernel
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block: merge BIOVEC_SEG_BOUNDARY into biovec_phys_mergeable 

These two checks should always be performed together, so merge them into
a single helper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2018-09-24 09:43:52 +02:00 committed by Jens Axboe
parent 0e253391a9
commit 3dccdae54f
5 changed files with 17 additions and 48 deletions
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4
block/bio.c
View File

@ -731,9 +731,7 @@ int bio_add_pc_page(struct request_queue *q, struct bio *bio, struct page
}
/* If we may be able to merge these biovecs, force a recount */
if (bio->bi_vcnt > 1 &&
biovec_phys_mergeable(bvec - 1, bvec) &&
BIOVEC_SEG_BOUNDARY(q, bvec - 1, bvec))
if (bio->bi_vcnt > 1 && biovec_phys_mergeable(q, bvec - 1, bvec))
bio_clear_flag(bio, BIO_SEG_VALID);
done:

12
block/blk-integrity.c
View File

@ -49,12 +49,8 @@ int blk_rq_count_integrity_sg(struct request_queue *q, struct bio *bio)
bio_for_each_integrity_vec(iv, bio, iter) {
if (prev) {
if (!biovec_phys_mergeable(&ivprv, &iv))
if (!biovec_phys_mergeable(q, &ivprv, &iv))
goto new_segment;
if (!BIOVEC_SEG_BOUNDARY(q, &ivprv, &iv))
goto new_segment;
if (seg_size + iv.bv_len > queue_max_segment_size(q))
goto new_segment;
@ -95,12 +91,8 @@ int blk_rq_map_integrity_sg(struct request_queue *q, struct bio *bio,
bio_for_each_integrity_vec(iv, bio, iter) {
if (prev) {
if (!biovec_phys_mergeable(&ivprv, &iv))
if (!biovec_phys_mergeable(q, &ivprv, &iv))
goto new_segment;
if (!BIOVEC_SEG_BOUNDARY(q, &ivprv, &iv))
goto new_segment;
if (sg->length + iv.bv_len > queue_max_segment_size(q))
goto new_segment;

29
block/blk-merge.c
View File

@ -21,9 +21,7 @@ static inline bool bios_segs_mergeable(struct request_queue *q,
struct bio *prev, struct bio_vec *prev_last_bv,
struct bio_vec *next_first_bv)
{
if (!biovec_phys_mergeable(prev_last_bv, next_first_bv))
return false;
if (!BIOVEC_SEG_BOUNDARY(q, prev_last_bv, next_first_bv))
if (!biovec_phys_mergeable(q, prev_last_bv, next_first_bv))
return false;
if (prev->bi_seg_back_size + next_first_bv->bv_len >
queue_max_segment_size(q))
@ -199,9 +197,7 @@ static struct bio *blk_bio_segment_split(struct request_queue *q,
if (bvprvp && blk_queue_cluster(q)) {
if (seg_size + bv.bv_len > queue_max_segment_size(q))
goto new_segment;
if (!biovec_phys_mergeable(bvprvp, &bv))
goto new_segment;
if (!BIOVEC_SEG_BOUNDARY(q, bvprvp, &bv))
if (!biovec_phys_mergeable(q, bvprvp, &bv))
goto new_segment;
seg_size += bv.bv_len;
@ -332,9 +328,7 @@ static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
if (seg_size + bv.bv_len
> queue_max_segment_size(q))
goto new_segment;
if (!biovec_phys_mergeable(&bvprv, &bv))
goto new_segment;
if (!BIOVEC_SEG_BOUNDARY(q, &bvprv, &bv))
if (!biovec_phys_mergeable(q, &bvprv, &bv))
goto new_segment;
seg_size += bv.bv_len;
@ -414,17 +408,7 @@ static int blk_phys_contig_segment(struct request_queue *q, struct bio *bio,
bio_get_last_bvec(bio, &end_bv);
bio_get_first_bvec(nxt, &nxt_bv);
if (!biovec_phys_mergeable(&end_bv, &nxt_bv))
return 0;
/*
* bio and nxt are contiguous in memory; check if the queue allows
* these two to be merged into one
*/
if (BIOVEC_SEG_BOUNDARY(q, &end_bv, &nxt_bv))
return 1;
return 0;
return biovec_phys_mergeable(q, &end_bv, &nxt_bv);
}
static inline void
@ -438,10 +422,7 @@ __blk_segment_map_sg(struct request_queue *q, struct bio_vec *bvec,
if (*sg && *cluster) {
if ((*sg)->length + nbytes > queue_max_segment_size(q))
goto new_segment;
if (!biovec_phys_mergeable(bvprv, bvec))
goto new_segment;
if (!BIOVEC_SEG_BOUNDARY(q, bvprv, bvec))
if (!biovec_phys_mergeable(q, bvprv, bvec))
goto new_segment;
(*sg)->length += nbytes;

12
block/blk.h
View File

@ -153,13 +153,19 @@ static inline void blk_queue_enter_live(struct request_queue *q)
#define ARCH_BIOVEC_PHYS_MERGEABLE(vec1, vec2) true
#endif
static inline bool biovec_phys_mergeable(const struct bio_vec *vec1,
const struct bio_vec *vec2)
static inline bool biovec_phys_mergeable(struct request_queue *q,
struct bio_vec *vec1, struct bio_vec *vec2)
{
if (bvec_to_phys(vec1) + vec1->bv_len != bvec_to_phys(vec2))
unsigned long mask = queue_segment_boundary(q);
phys_addr_t addr1 = bvec_to_phys(vec1);
phys_addr_t addr2 = bvec_to_phys(vec2);
if (addr1 + vec1->bv_len != addr2)
return false;
if (!ARCH_BIOVEC_PHYS_MERGEABLE(vec1, vec2))
return false;
if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask))
return false;
return true;
}

8
include/linux/bio.h
View File

@ -137,14 +137,6 @@ static inline bool bio_full(struct bio *bio)
*/
#define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset)
/*
* merge helpers etc
*/
#define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \
(((addr1) | (mask)) == (((addr2) - 1) | (mask)))
#define BIOVEC_SEG_BOUNDARY(q, b1, b2) \
__BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q)))
/*
* drivers should _never_ use the all version - the bio may have been split
* before it got to the driver and the driver won't own all of it