linux-kernel - [PATCH 11/15] dm stripe: support copy

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Date:	Thu, 10 Dec 2015 12:31:00 -0500 (EST)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	"James E.J. Bottomley" <JBottomley@...n.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Jens Axboe <axboe@...nel.dk>,
	Mike Snitzer <msnitzer@...hat.com>,
	Jonathan Brassow <jbrassow@...hat.com>
cc:	dm-devel@...hat.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: [PATCH 11/15] 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 |    1 +
 1 file changed, 1 insertion(+)

Index: linux-4.3-rc1/drivers/md/dm-stripe.c
===================================================================
--- linux-4.3-rc1.orig/drivers/md/dm-stripe.c	2015-09-14 16:06:36.000000000 +0200
+++ linux-4.3-rc1/drivers/md/dm-stripe.c	2015-09-14 16:23:01.000000000 +0200
@@ -169,6 +169,7 @@ 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))
--
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