dm crypt: add null iv

Add a new IV generation method 'null' to read old filesystem images created
with SuSE's loop_fish2 module.

Signed-off-by: Ludwig Nussel <ludwig.nussel@suse.de>
Acked-By: Christophe Saout <christophe@saout.de>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 17 insertions, 1 deletions

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 1ecee5e1c548..7b0fcfc9eaa5 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -121,6 +121,9 @@ static void clone_init(struct crypt_io *, struct bio *);
  * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1
  *        (needed for LRW-32-AES and possible other narrow block modes)
  *
+ * null: the initial vector is always zero.  Provides compatibility with
+ *       obsolete loop_fish2 devices.  Do not use for new devices.
+ *
  * plumb: unimplemented, see:
  * http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454
  */
@@ -257,6 +260,13 @@ static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, sector_t sector)
         return 0;
 }
 
+static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, sector_t sector)
+{
+        memset(iv, 0, cc->iv_size);
+
+        return 0;
+}
+
 static struct crypt_iv_operations crypt_iv_plain_ops = {
         .generator = crypt_iv_plain_gen
 };
@@ -273,6 +283,10 @@ static struct crypt_iv_operations crypt_iv_benbi_ops = {
         .generator = crypt_iv_benbi_gen
 };
 
+static struct crypt_iv_operations crypt_iv_null_ops = {
+        .generator = crypt_iv_null_gen
+};
+
 static int
 crypt_convert_scatterlist(struct crypt_config *cc, struct scatterlist *out,
                           struct scatterlist *in, unsigned int length,
@@ -803,6 +817,8 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
                 cc->iv_gen_ops = &crypt_iv_essiv_ops;
         else if (strcmp(ivmode, "benbi") == 0)
                 cc->iv_gen_ops = &crypt_iv_benbi_ops;
+        else if (strcmp(ivmode, "null") == 0)
+                cc->iv_gen_ops = &crypt_iv_null_ops;
         else {
                 ti->error = "Invalid IV mode";
                 goto bad2;
@@ -1030,7 +1046,7 @@ error:
 
 static struct target_type crypt_target = {
         .name   = "crypt",
-        .version= {1, 3, 0},
+        .version= {1, 5, 0},
         .module = THIS_MODULE,
         .ctr    = crypt_ctr,
         .dtr    = crypt_dtr,