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-rw-r--r--drivers/md/dm-crypt.c48
1 files changed, 35 insertions, 13 deletions
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index dc4403bcc6a0..e0ebe685be6a 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -64,6 +64,7 @@ struct dm_crypt_request {
struct convert_context *ctx;
struct scatterlist sg_in;
struct scatterlist sg_out;
+ sector_t iv_sector;
};
struct crypt_config;
@@ -74,7 +75,10 @@ struct crypt_iv_operations {
void (*dtr)(struct crypt_config *cc);
int (*init)(struct crypt_config *cc);
int (*wipe)(struct crypt_config *cc);
- int (*generator)(struct crypt_config *cc, u8 *iv, sector_t sector);
+ int (*generator)(struct crypt_config *cc, u8 *iv,
+ struct dm_crypt_request *dmreq);
+ int (*post)(struct crypt_config *cc, u8 *iv,
+ struct dm_crypt_request *dmreq);
};
struct iv_essiv_private {
@@ -168,6 +172,7 @@ static struct kmem_cache *_crypt_io_pool;
static void clone_init(struct dm_crypt_io *, struct bio *);
static void kcryptd_queue_crypt(struct dm_crypt_io *io);
+static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq);
static struct crypt_cpu *this_crypt_config(struct crypt_config *cc)
{
@@ -205,19 +210,20 @@ static struct crypto_ablkcipher *any_tfm(struct crypt_config *cc)
* http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454
*/
-static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, sector_t sector)
+static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv,
+ struct dm_crypt_request *dmreq)
{
memset(iv, 0, cc->iv_size);
- *(u32 *)iv = cpu_to_le32(sector & 0xffffffff);
+ *(u32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff);
return 0;
}
static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv,
- sector_t sector)
+ struct dm_crypt_request *dmreq)
{
memset(iv, 0, cc->iv_size);
- *(u64 *)iv = cpu_to_le64(sector);
+ *(u64 *)iv = cpu_to_le64(dmreq->iv_sector);
return 0;
}
@@ -378,12 +384,13 @@ bad:
return err;
}
-static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, sector_t sector)
+static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv,
+ struct dm_crypt_request *dmreq)
{
struct crypto_cipher *essiv_tfm = this_crypt_config(cc)->iv_private;
memset(iv, 0, cc->iv_size);
- *(u64 *)iv = cpu_to_le64(sector);
+ *(u64 *)iv = cpu_to_le64(dmreq->iv_sector);
crypto_cipher_encrypt_one(essiv_tfm, iv, iv);
return 0;
@@ -417,19 +424,21 @@ static void crypt_iv_benbi_dtr(struct crypt_config *cc)
{
}
-static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv, sector_t sector)
+static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv,
+ struct dm_crypt_request *dmreq)
{
__be64 val;
memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */
- val = cpu_to_be64(((u64)sector << cc->iv_gen_private.benbi.shift) + 1);
+ val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1);
put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64)));
return 0;
}
-static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv, sector_t sector)
+static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv,
+ struct dm_crypt_request *dmreq)
{
memset(iv, 0, cc->iv_size);
@@ -489,6 +498,13 @@ static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc,
return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start);
}
+static u8 *iv_of_dmreq(struct crypt_config *cc,
+ struct dm_crypt_request *dmreq)
+{
+ return (u8 *)ALIGN((unsigned long)(dmreq + 1),
+ crypto_ablkcipher_alignmask(any_tfm(cc)) + 1);
+}
+
static int crypt_convert_block(struct crypt_config *cc,
struct convert_context *ctx,
struct ablkcipher_request *req)
@@ -500,9 +516,9 @@ static int crypt_convert_block(struct crypt_config *cc,
int r = 0;
dmreq = dmreq_of_req(cc, req);
- iv = (u8 *)ALIGN((unsigned long)(dmreq + 1),
- crypto_ablkcipher_alignmask(any_tfm(cc)) + 1);
+ iv = iv_of_dmreq(cc, dmreq);
+ dmreq->iv_sector = ctx->sector;
dmreq->ctx = ctx;
sg_init_table(&dmreq->sg_in, 1);
sg_set_page(&dmreq->sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT,
@@ -525,7 +541,7 @@ static int crypt_convert_block(struct crypt_config *cc,
}
if (cc->iv_gen_ops) {
- r = cc->iv_gen_ops->generator(cc, iv, ctx->sector);
+ r = cc->iv_gen_ops->generator(cc, iv, dmreq);
if (r < 0)
return r;
}
@@ -538,6 +554,9 @@ static int crypt_convert_block(struct crypt_config *cc,
else
r = crypto_ablkcipher_decrypt(req);
+ if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
+ r = cc->iv_gen_ops->post(cc, iv, dmreq);
+
return r;
}
@@ -1005,6 +1024,9 @@ static void kcryptd_async_done(struct crypto_async_request *async_req,
return;
}
+ if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post)
+ error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq);
+
mempool_free(req_of_dmreq(cc, dmreq), cc->req_pool);
if (!atomic_dec_and_test(&ctx->pending))