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Date:	Wed, 19 Dec 2012 22:07:11 +0100
From:	Milan Broz <mbroz@...hat.com>
To:	Mike Snitzer <snitzer@...hat.com>
CC:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Joseph Salisbury <joseph.salisbury@...onical.com>,
	Kernel Team <kernel-team@...ts.ubuntu.com>,
	linux-kernel@...r.kernel.org, jgarzik@...hat.com,
	JBottomley@...allels.com
Subject: [PATCH] dm-crypt: never use write same (was Re: [v3.7 Regression]
  [SCSI] sd: Implement support for WRITE SAME)

Does this help?

dm-crypt: never use write same

Ciphertext device is not compatible with WRITE SAME,
disable it for all dmcrypt devices.

Signed-off-by: Milan Broz <mbroz@...hat.com>

--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1844,6 +1844,12 @@ static int crypt_iterate_devices(struct dm_target *ti,
 	return fn(ti, cc->dev, cc->start, ti->len, data);
 }
 
+static void crypt_io_hints(struct dm_target *ti,
+			    struct queue_limits *limits)
+{
+	limits->max_write_same_sectors = 0;
+}
+
 static struct target_type crypt_target = {
 	.name   = "crypt",
 	.version = {1, 11, 0},
@@ -1858,6 +1864,7 @@ static struct target_type crypt_target = {
 	.message = crypt_message,
 	.merge  = crypt_merge,
 	.iterate_devices = crypt_iterate_devices,
+	.io_hints = crypt_io_hints,
 };
 
 static int __init dm_crypt_init(void)

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