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Subject[PATCH V9 14/19] block: enable multipage bvecs
Date
This patch pulls the trigger for multi-page bvecs.

Now any request queue which supports queue cluster will see multi-page
bvecs.

Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
block/bio.c | 24 ++++++++++++++++++------
1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index 6486722d4d4b..ed6df6f8e63d 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -767,12 +767,24 @@ bool __bio_try_merge_page(struct bio *bio, struct page *page,

if (bio->bi_vcnt > 0) {
struct bio_vec *bv = &bio->bi_io_vec[bio->bi_vcnt - 1];
-
- if (page == bv->bv_page && off == bv->bv_offset + bv->bv_len) {
- bv->bv_len += len;
- bio->bi_iter.bi_size += len;
- return true;
- }
+ struct request_queue *q = NULL;
+
+ if (page == bv->bv_page && off == (bv->bv_offset + bv->bv_len)
+ && (off + len) <= PAGE_SIZE)
+ goto merge;
+
+ if (bio->bi_disk)
+ q = bio->bi_disk->queue;
+
+ /* disable multi-page bvec too if cluster isn't enabled */
+ if (!q || !blk_queue_cluster(q) ||
+ ((page_to_phys(bv->bv_page) + bv->bv_offset + bv->bv_len) !=
+ (page_to_phys(page) + off)))
+ return false;
+ merge:
+ bv->bv_len += len;
+ bio->bi_iter.bi_size += len;
+ return true;
}
return false;
}
--
2.9.5
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