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dm crypt: add async request mempool 

dm-crypt: Use crypto ablkcipher interface

Introduce mempool for async crypto requests.

cc->req is used mainly during synchronous operations
(to prevent allocation and deallocation of the same object).

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 02:11:07 +00:00 committed by Alasdair G Kergon
parent 01482b7671
commit ddd42edfd8
1 changed files with 43 additions and 2 deletions
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45
drivers/md/dm-crypt.c
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@ -80,10 +80,11 @@ struct crypt_config {
sector_t start;
/*
* pool for per bio private data and
* for encryption buffer pages
* pool for per bio private data, crypto requests and
* encryption requeusts/buffer pages
*/
mempool_t *io_pool;
mempool_t *req_pool;
mempool_t *page_pool;
struct bio_set *bs;
@ -101,6 +102,22 @@ struct crypt_config {
sector_t iv_offset;
unsigned int iv_size;
/*
* Layout of each crypto request:
*
* struct ablkcipher_request
* context
* padding
* struct dm_crypt_request
* padding
* IV
*
* The padding is added so that dm_crypt_request and the IV are
* correctly aligned.
*/
unsigned int dmreq_start;
struct ablkcipher_request *req;
char cipher[CRYPTO_MAX_ALG_NAME];
char chainmode[CRYPTO_MAX_ALG_NAME];
struct crypto_blkcipher *tfm;
@ -377,6 +394,13 @@ static int crypt_convert_block(struct crypt_config *cc,
ctx->sector);
}
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);
}
/*
* Encrypt / decrypt data from one bio to another one (can be the same one)
*/
@ -882,6 +906,17 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
goto bad_slab_pool;
}
cc->dmreq_start = sizeof(struct ablkcipher_request);
cc->dmreq_start = ALIGN(cc->dmreq_start, crypto_tfm_ctx_alignment());
cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start +
sizeof(struct dm_crypt_request) + cc->iv_size);
if (!cc->req_pool) {
ti->error = "Cannot allocate crypt request mempool";
goto bad_req_pool;
}
cc->req = NULL;
cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0);
if (!cc->page_pool) {
ti->error = "Cannot allocate page mempool";
@ -955,6 +990,8 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
bad_bs:
mempool_destroy(cc->page_pool);
bad_page_pool:
mempool_destroy(cc->req_pool);
bad_req_pool:
mempool_destroy(cc->io_pool);
bad_slab_pool:
if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
@ -975,8 +1012,12 @@ static void crypt_dtr(struct dm_target *ti)
destroy_workqueue(cc->io_queue);
destroy_workqueue(cc->crypt_queue);
if (cc->req)
mempool_free(cc->req, cc->req_pool);
bioset_free(cc->bs);
mempool_destroy(cc->page_pool);
mempool_destroy(cc->req_pool);
mempool_destroy(cc->io_pool);
kfree(cc->iv_mode);