diff options
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-crypt.c | 45 |
1 files changed, 43 insertions, 2 deletions
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index 2da9b9536af..79316580c78 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -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 @@ bad_device: 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); |