[PATCH v3 48/49] block: enable multipage bvecs
From: Ming Lei <hidden>
Date: 2017-08-08 08:45:47
Also in:
linux-fsdevel, linux-mm, lkml
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
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 <redacted> --- block/bio.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/block/bio.c b/block/bio.c
index fd6a055f491c..a5f7fd4ef818 100644
--- a/block/bio.c
+++ b/block/bio.c@@ -844,6 +844,11 @@ 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_bdev) + q = bdev_get_queue(bio->bi_bdev); + bv = &bio->bi_io_vec[bio->bi_vcnt - 1]; if (page == bv->bv_page &&
@@ -851,6 +856,14 @@ 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)
--
2.9.4