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path: root/drivers/md/dm-crypt.c
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Diffstat (limited to 'drivers/md/dm-crypt.c')
-rw-r--r--drivers/md/dm-crypt.c43
1 files changed, 31 insertions, 12 deletions
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 35bda49796f..bfefd079a95 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -60,6 +60,7 @@ struct dm_crypt_io {
};
struct dm_crypt_request {
+ struct convert_context *ctx;
struct scatterlist sg_in;
struct scatterlist sg_out;
};
@@ -335,6 +336,18 @@ static void crypt_convert_init(struct crypt_config *cc,
init_completion(&ctx->restart);
}
+static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc,
+ struct ablkcipher_request *req)
+{
+ return (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
+}
+
+static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc,
+ struct dm_crypt_request *dmreq)
+{
+ return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start);
+}
+
static int crypt_convert_block(struct crypt_config *cc,
struct convert_context *ctx,
struct ablkcipher_request *req)
@@ -345,10 +358,11 @@ static int crypt_convert_block(struct crypt_config *cc,
u8 *iv;
int r = 0;
- dmreq = (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
+ dmreq = dmreq_of_req(cc, req);
iv = (u8 *)ALIGN((unsigned long)(dmreq + 1),
crypto_ablkcipher_alignmask(cc->tfm) + 1);
+ dmreq->ctx = ctx;
sg_init_table(&dmreq->sg_in, 1);
sg_set_page(&dmreq->sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT,
bv_in->bv_offset + ctx->offset_in);
@@ -395,8 +409,9 @@ static void crypt_alloc_req(struct crypt_config *cc,
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,
- kcryptd_async_done, ctx);
+ CRYPTO_TFM_REQ_MAY_SLEEP,
+ kcryptd_async_done,
+ dmreq_of_req(cc, cc->req));
}
/*
@@ -553,19 +568,22 @@ static void crypt_inc_pending(struct dm_crypt_io *io)
static void crypt_dec_pending(struct dm_crypt_io *io)
{
struct crypt_config *cc = io->target->private;
+ struct bio *base_bio = io->base_bio;
+ struct dm_crypt_io *base_io = io->base_io;
+ int error = io->error;
if (!atomic_dec_and_test(&io->pending))
return;
- if (likely(!io->base_io))
- bio_endio(io->base_bio, io->error);
+ mempool_free(io, cc->io_pool);
+
+ if (likely(!base_io))
+ bio_endio(base_bio, error);
else {
- if (io->error && !io->base_io->error)
- io->base_io->error = io->error;
- crypt_dec_pending(io->base_io);
+ if (error && !base_io->error)
+ base_io->error = error;
+ crypt_dec_pending(base_io);
}
-
- mempool_free(io, cc->io_pool);
}
/*
@@ -821,7 +839,8 @@ static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
static void kcryptd_async_done(struct crypto_async_request *async_req,
int error)
{
- struct convert_context *ctx = async_req->data;
+ struct dm_crypt_request *dmreq = async_req->data;
+ struct convert_context *ctx = dmreq->ctx;
struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
struct crypt_config *cc = io->target->private;
@@ -830,7 +849,7 @@ static void kcryptd_async_done(struct crypto_async_request *async_req,
return;
}
- mempool_free(ablkcipher_request_cast(async_req), cc->req_pool);
+ mempool_free(req_of_dmreq(cc, dmreq), cc->req_pool);
if (!atomic_dec_and_test(&ctx->pending))
return;