Messages in this thread Patch in this message | | | From | Ming Lei <> | Subject | [PATCH V4 42/45] block: enable multipage bvecs | Date | Mon, 18 Dec 2017 20:22:44 +0800 |
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This patch pulls the trigger for multipage bvecs.
Now any request queue which supports queue cluster will see multipage bvecs.
Signed-off-by: Ming Lei <ming.lei@redhat.com> --- block/bio.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/block/bio.c b/block/bio.c index e82e4c815dbb..34af328681a8 100644 --- a/block/bio.c +++ b/block/bio.c @@ -845,6 +845,11 @@ int bio_add_page(struct bio *bio, struct page *page, * a consecutive offset. Optimize this special case. */ if (bio->bi_vcnt > 0) { + struct request_queue *q = NULL; + + if (bio->bi_disk) + q = bio->bi_disk->queue; + bv = &bio->bi_io_vec[bio->bi_vcnt - 1]; if (page == bv->bv_page && @@ -852,6 +857,14 @@ int bio_add_page(struct bio *bio, struct page *page, bv->bv_len += len; goto done; } + + /* disable multipage bvec too if cluster isn't enabled */ + if (q && blk_queue_cluster(q) && + (bvec_to_phys(bv) + bv->bv_len == + page_to_phys(page) + offset)) { + bv->bv_len += len; + goto done; + } } if (bio->bi_vcnt >= bio->bi_max_vecs) -- 2.9.5
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