linux-kernel - [PATCH V10 14/19] block: enable multipage bvecs

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Date:   Thu, 15 Nov 2018 16:53:01 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Ming Lei <ming.lei@...hat.com>,
        Dave Chinner <dchinner@...hat.com>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, Shaohua Li <shli@...nel.org>,
        linux-raid@...r.kernel.org, linux-erofs@...ts.ozlabs.org,
        David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        linux-xfs@...r.kernel.org, Gao Xiang <gaoxiang25@...wei.com>,
        Christoph Hellwig <hch@....de>, Theodore Ts'o <tytso@....edu>,
        linux-ext4@...r.kernel.org, Coly Li <colyli@...e.de>,
        linux-bcache@...r.kernel.org, Boaz Harrosh <ooo@...ctrozaur.com>,
        Bob Peterson <rpeterso@...hat.com>, cluster-devel@...hat.com
Subject: [PATCH V10 14/19] block: enable multipage bvecs

This patch pulls the trigger for multi-page bvecs.

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

Cc: Dave Chinner <dchinner@...hat.com>
Cc: Kent Overstreet <kent.overstreet@...il.com>
Cc: Mike Snitzer <snitzer@...hat.com>
Cc: dm-devel@...hat.com
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: linux-fsdevel@...r.kernel.org
Cc: Shaohua Li <shli@...nel.org>
Cc: linux-raid@...r.kernel.org
Cc: linux-erofs@...ts.ozlabs.org
Cc: David Sterba <dsterba@...e.com>
Cc: linux-btrfs@...r.kernel.org
Cc: Darrick J. Wong <darrick.wong@...cle.com>
Cc: linux-xfs@...r.kernel.org
Cc: Gao Xiang <gaoxiang25@...wei.com>
Cc: Christoph Hellwig <hch@....de>
Cc: Theodore Ts'o <tytso@....edu>
Cc: linux-ext4@...r.kernel.org
Cc: Coly Li <colyli@...e.de>
Cc: linux-bcache@...r.kernel.org
Cc: Boaz Harrosh <ooo@...ctrozaur.com>
Cc: Bob Peterson <rpeterso@...hat.com>
Cc: cluster-devel@...hat.com
Signed-off-by: Ming Lei <ming.lei@...hat.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