From: Milan Broz <mbroz@redhat.com>
dm-crypt: Use crypto ablkcipher interface
Prepare callback function for async crypto operation.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Milan Broz <mbroz@redhat.com>
---
drivers/md/dm-crypt.c | 26 ++++++++++++++++++++++++++
1 files changed, 26 insertions(+)
Index: linux-2.6.24-rc3/drivers/md/dm-crypt.c
===================================================================
--- linux-2.6.24-rc3.orig/drivers/md/dm-crypt.c 2007-12-07 02:53:10.000000000 +0000
+++ linux-2.6.24-rc3/drivers/md/dm-crypt.c 2007-12-07 02:53:14.000000000 +0000
@@ -318,6 +318,28 @@ static struct crypt_iv_operations crypt_
.generator = crypt_iv_null_gen
};
+static void crypt_async_done(struct crypto_async_request *async_req, int error)
+{
+ struct convert_context *ctx = async_req->data;
+ struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
+ struct crypt_config *cc = io->target->private;
+
+ if (error == -EINPROGRESS) {
+ complete(&ctx->restart);
+ return;
+ }
+
+ mempool_free(ablkcipher_request_cast(async_req), cc->req_pool);
+
+ if (!atomic_dec_and_test(&ctx->pending))
+ return;
+
+ if (bio_data_dir(io->base_bio) == READ)
+ crypt_read_io_done(io, error);
+ else
+ crypt_write_io_done(io, error);
+}
+
static int
crypt_convert_scatterlist(struct crypt_config *cc, struct scatterlist *out,
struct scatterlist *in, unsigned int length,
@@ -404,6 +426,10 @@ static void crypt_alloc_req(struct crypt
{
if (!cc->req)
cc->req = mempool_alloc(cc->req_pool, GFP_NOIO);
+ ablkcipher_request_set_tfm(cc->req, cc->tfm);
+ ablkcipher_request_set_callback(cc->req, CRYPTO_TFM_REQ_MAY_BACKLOG |
+ CRYPTO_TFM_REQ_MAY_SLEEP,
+ crypt_async_done, ctx);
}
/*