cryptoloop: add a deprecation warning

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 <hch@lst.de>
Link: https://lore.kernel.org/r/20210827163250.255325-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index 63056cf..fbb3a55 100644 (file)
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -213,7 +213,7 @@ config BLK_DEV_LOOP_MIN_COUNT
          dynamically allocated with the /dev/loop-control interface.
 
 config BLK_DEV_CRYPTOLOOP
-       tristate "Cryptoloop Support"
+       tristate "Cryptoloop Support (DEPRECATED)"
        select CRYPTO
        select CRYPTO_CBC
        depends on BLK_DEV_LOOP
@@ -225,7 +225,7 @@ 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 3cabc33..f0a91fa 100644 (file)
--- a/drivers/block/cryptoloop.c
+++ b/drivers/block/cryptoloop.c
@@ -189,6 +189,8 @@ 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;
 }