linux-kernel - [PATCH 14/18] dm stripe: support copy

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Date:	Wed, 22 Oct 2014 09:32:09 -0400 (EDT)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	"Alasdair G. Kergon" <agk@...hat.com>,
	Mike Snitzer <msnitzer@...hat.com>,
	Jonathan Brassow <jbrassow@...hat.com>,
	Edward Thornber <thornber@...hat.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Jens Axboe <axboe@...nel.dk>,
	Christoph Hellwig <hch@...radead.org>
cc:	dm-devel@...hat.com, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org
Subject: [PATCH 14/18] dm stripe: support copy

Support the copy operation for the stripe target.

In stripe_merge, we verify that the underlying device supports copy. If it
doesn't, we can fail fast without any bio being contructed.

Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>

---
 drivers/md/dm-stripe.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

Index: linux-3.16-rc4/drivers/md/dm-stripe.c
===================================================================
--- linux-3.16-rc4.orig/drivers/md/dm-stripe.c	2014-07-11 22:20:25.000000000 +0200
+++ linux-3.16-rc4/drivers/md/dm-stripe.c	2014-07-11 22:23:54.000000000 +0200
@@ -165,6 +165,7 @@ static int stripe_ctr(struct dm_target *
 	ti->num_flush_bios = stripes;
 	ti->num_discard_bios = stripes;
 	ti->num_write_same_bios = stripes;
+	ti->copy_supported = 1;
 
 	sc->chunk_size = chunk_size;
 	if (chunk_size & (chunk_size - 1))
@@ -416,11 +417,19 @@ static int stripe_merge(struct dm_target
 	struct stripe_c *sc = ti->private;
 	sector_t bvm_sector = bvm->bi_sector;
 	uint32_t stripe;
+	struct block_device *bdev;
 	struct request_queue *q;
 
 	stripe_map_sector(sc, bvm_sector, &stripe, &bvm_sector);
 
-	q = bdev_get_queue(sc->stripe[stripe].dev->bdev);
+	bdev = sc->stripe[stripe].dev->bdev;
+
+	if (unlikely((bvm->bi_rw & REQ_COPY) != 0)) {
+		if (!bdev_copy_offload(bdev))
+			return 0;
+	}
+
+	q = bdev_get_queue(bdev);
 	if (!q->merge_bvec_fn)
 		return max_size;
 

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