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dm crypt: prepare async callback fn

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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>
This commit is contained in:
Milan Broz 2008-02-08 02:11:12 +00:00 committed by Alasdair G Kergon
parent 43d6903482
commit 95497a9600
1 changed files with 41 additions and 4 deletions
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45
drivers/md/dm-crypt.c
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@ -406,11 +406,17 @@ static int crypt_convert_block(struct crypt_config *cc,
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_read(struct dm_crypt_io *io)
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 @@ static void kcryptd_queue_io(struct dm_crypt_io *io)
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 @@ static void kcryptd_crypt_write_io_submit(struct dm_crypt_io *io, int error)
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 @@ static void kcryptd_crypt_write_convert_loop(struct dm_crypt_io *io)
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 @@ static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
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);