@@ -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)
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(+)