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From: Sasha Levin <>
Cc: Christoph Hellwig <>, Jens Axboe <>,
	Sasha Levin <>,
Subject: [PATCH AUTOSEL 4.9 5/5] cryptoloop: add a deprecation warning
Date: Mon, 30 Aug 2021 08:00:53 -0400	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

From: Christoph Hellwig <>

[ Upstream commit 222013f9ac30b9cec44301daa8dbd0aae38abffb ]

Support for cryptoloop has been officially marked broken and deprecated
in favor of dm-crypt (which supports the same broken algorithms if
needed) in Linux 2.6.4 (released in March 2004), and support for it has
been entirely removed from losetup in util-linux 2.23 (released in April
2013).  Add a warning and a deprecation schedule.

Signed-off-by: Christoph Hellwig <>
Signed-off-by: Jens Axboe <>
Signed-off-by: Sasha Levin <>
 drivers/block/Kconfig      | 4 ++--
 drivers/block/cryptoloop.c | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index 894102fd5a06..b701c79f07e5 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -257,7 +257,7 @@ config BLK_DEV_LOOP_MIN_COUNT
 	  dynamically allocated with the /dev/loop-control interface.
-	tristate "Cryptoloop Support"
+	tristate "Cryptoloop Support (DEPRECATED)"
 	select CRYPTO
 	select CRYPTO_CBC
 	depends on BLK_DEV_LOOP
@@ -269,7 +269,7 @@ config BLK_DEV_CRYPTOLOOP
 	  WARNING: This device is not safe for journaled file systems like
 	  ext3 or Reiserfs. Please use the Device Mapper crypto module
 	  instead, which can be configured to be on-disk compatible with the
-	  cryptoloop device.
+	  cryptoloop device.  cryptoloop support will be removed in Linux 5.16.
 source "drivers/block/drbd/Kconfig"
diff --git a/drivers/block/cryptoloop.c b/drivers/block/cryptoloop.c
index 3d31761c0ed0..adbfd3e2a60f 100644
--- a/drivers/block/cryptoloop.c
+++ b/drivers/block/cryptoloop.c
@@ -203,6 +203,8 @@ init_cryptoloop(void)
 	if (rc)
 		printk(KERN_ERR "cryptoloop: loop_register_transfer failed\n");
+	else
+		pr_warn("the cryptoloop driver has been deprecated and will be removed in in Linux 5.16\n");
 	return rc;

           reply	other threads:[~2021-08-30 12:01 UTC|newest]

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