dm crypt: prepare async callback fn
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>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 2ea3eb9..c45bd0e 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -406,11 +406,17 @@
ctx->sector);
}
+static void kcryptd_async_done(struct crypto_async_request *async_req,
+ int error);
static void crypt_alloc_req(struct crypt_config *cc,
struct convert_context *ctx)
{
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,
+ kcryptd_async_done, ctx);
}
/*
@@ -615,6 +621,9 @@
static void kcryptd_io_write(struct dm_crypt_io *io)
{
+ struct bio *clone = io->ctx.bio_out;
+
+ generic_make_request(clone);
}
static void kcryptd_io(struct work_struct *work)
@@ -635,7 +644,8 @@
queue_work(cc->io_queue, &io->work);
}
-static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int error)
+static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io,
+ int error, int async)
{
struct bio *clone = io->ctx.bio_out;
struct crypt_config *cc = io->target->private;
@@ -653,8 +663,12 @@
clone->bi_sector = cc->start + io->sector;
io->sector += bio_sectors(clone);
- atomic_inc(&io->pending);
- generic_make_request(clone);
+ if (async)
+ kcryptd_queue_io(io);
+ else {
+ atomic_inc(&io->pending);
+ generic_make_request(clone);
+ }
}
static void kcryptd_crypt_write_convert_loop(struct dm_crypt_io *io)
@@ -682,7 +696,7 @@
r = crypt_convert(cc, &io->ctx);
- kcryptd_crypt_write_io_submit(io, r);
+ kcryptd_crypt_write_io_submit(io, r, 0);
if (unlikely(r < 0))
return;
@@ -728,6 +742,29 @@
kcryptd_crypt_read_done(io, r);
}
+static void kcryptd_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)
+ kcryptd_crypt_read_done(io, error);
+ else
+ kcryptd_crypt_write_io_submit(io, error, 1);
+}
+
static void kcryptd_crypt(struct work_struct *work)
{
struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);