/*
* Copyright (C) 2003 Christophe Saout <christophe@saout.de>
* Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org>
- * Copyright (C) 2006-2007 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2006-2008 Red Hat, Inc. All rights reserved.
*
* This file is released under the GPL.
*/
+#include <linux/completion.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/init.h>
* context holding the current state of a multi-part conversion
*/
struct convert_context {
+ struct completion restart;
struct bio *bio_in;
struct bio *bio_out;
unsigned int offset_in;
unsigned int idx_in;
unsigned int idx_out;
sector_t sector;
+ atomic_t pending;
};
/*
sector_t sector;
};
+struct dm_crypt_request {
+ struct scatterlist sg_in;
+ struct scatterlist sg_out;
+};
+
struct crypt_config;
struct crypt_iv_operations {
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;
struct workqueue_struct *io_queue;
struct workqueue_struct *crypt_queue;
+ wait_queue_head_t writeq;
+
/*
* crypto related data
*/
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;
+ struct crypto_ablkcipher *tfm;
unsigned long flags;
unsigned int key_size;
u8 key[0];
return PTR_ERR(essiv_tfm);
}
if (crypto_cipher_blocksize(essiv_tfm) !=
- crypto_blkcipher_ivsize(cc->tfm)) {
+ crypto_ablkcipher_ivsize(cc->tfm)) {
ti->error = "Block size of ESSIV cipher does "
"not match IV size of block cipher";
crypto_free_cipher(essiv_tfm);
static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti,
const char *opts)
{
- unsigned int bs = crypto_blkcipher_blocksize(cc->tfm);
+ unsigned bs = crypto_ablkcipher_blocksize(cc->tfm);
int log = ilog2(bs);
/* we need to calculate how far we must shift the sector count
.generator = crypt_iv_null_gen
};
-static int
-crypt_convert_scatterlist(struct crypt_config *cc, struct scatterlist *out,
- struct scatterlist *in, unsigned int length,
- int write, sector_t sector)
-{
- u8 iv[cc->iv_size] __attribute__ ((aligned(__alignof__(u64))));
- struct blkcipher_desc desc = {
- .tfm = cc->tfm,
- .info = iv,
- .flags = CRYPTO_TFM_REQ_MAY_SLEEP,
- };
- int r;
-
- if (cc->iv_gen_ops) {
- r = cc->iv_gen_ops->generator(cc, iv, sector);
- if (r < 0)
- return r;
-
- if (write)
- r = crypto_blkcipher_encrypt_iv(&desc, out, in, length);
- else
- r = crypto_blkcipher_decrypt_iv(&desc, out, in, length);
- } else {
- if (write)
- r = crypto_blkcipher_encrypt(&desc, out, in, length);
- else
- r = crypto_blkcipher_decrypt(&desc, out, in, length);
- }
-
- return r;
-}
-
static void crypt_convert_init(struct crypt_config *cc,
struct convert_context *ctx,
struct bio *bio_out, struct bio *bio_in,
ctx->idx_in = bio_in ? bio_in->bi_idx : 0;
ctx->idx_out = bio_out ? bio_out->bi_idx : 0;
ctx->sector = sector + cc->iv_offset;
+ init_completion(&ctx->restart);
+ atomic_set(&ctx->pending, 1);
+}
+
+static int crypt_convert_block(struct crypt_config *cc,
+ struct convert_context *ctx,
+ struct ablkcipher_request *req)
+{
+ struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in);
+ struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out);
+ struct dm_crypt_request *dmreq;
+ u8 *iv;
+ int r = 0;
+
+ dmreq = (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
+ iv = (u8 *)ALIGN((unsigned long)(dmreq + 1),
+ crypto_ablkcipher_alignmask(cc->tfm) + 1);
+
+ 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);
+
+ sg_init_table(&dmreq->sg_out, 1);
+ sg_set_page(&dmreq->sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT,
+ bv_out->bv_offset + ctx->offset_out);
+
+ ctx->offset_in += 1 << SECTOR_SHIFT;
+ if (ctx->offset_in >= bv_in->bv_len) {
+ ctx->offset_in = 0;
+ ctx->idx_in++;
+ }
+
+ ctx->offset_out += 1 << SECTOR_SHIFT;
+ if (ctx->offset_out >= bv_out->bv_len) {
+ ctx->offset_out = 0;
+ ctx->idx_out++;
+ }
+
+ if (cc->iv_gen_ops) {
+ r = cc->iv_gen_ops->generator(cc, iv, ctx->sector);
+ if (r < 0)
+ return r;
+ }
+
+ ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out,
+ 1 << SECTOR_SHIFT, iv);
+
+ if (bio_data_dir(ctx->bio_in) == WRITE)
+ r = crypto_ablkcipher_encrypt(req);
+ else
+ r = crypto_ablkcipher_decrypt(req);
+
+ return r;
+}
+
+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);
}
/*
static int crypt_convert(struct crypt_config *cc,
struct convert_context *ctx)
{
- int r = 0;
+ int r;
while(ctx->idx_in < ctx->bio_in->bi_vcnt &&
ctx->idx_out < ctx->bio_out->bi_vcnt) {
- struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in);
- struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out);
- struct scatterlist sg_in, sg_out;
- sg_init_table(&sg_in, 1);
- sg_set_page(&sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT, bv_in->bv_offset + ctx->offset_in);
+ crypt_alloc_req(cc, ctx);
- sg_init_table(&sg_out, 1);
- sg_set_page(&sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT, bv_out->bv_offset + ctx->offset_out);
+ atomic_inc(&ctx->pending);
- ctx->offset_in += sg_in.length;
- if (ctx->offset_in >= bv_in->bv_len) {
- ctx->offset_in = 0;
- ctx->idx_in++;
- }
+ r = crypt_convert_block(cc, ctx, cc->req);
- ctx->offset_out += sg_out.length;
- if (ctx->offset_out >= bv_out->bv_len) {
- ctx->offset_out = 0;
- ctx->idx_out++;
- }
+ switch (r) {
+ /* async */
+ case -EBUSY:
+ wait_for_completion(&ctx->restart);
+ INIT_COMPLETION(ctx->restart);
+ /* fall through*/
+ case -EINPROGRESS:
+ cc->req = NULL;
+ ctx->sector++;
+ continue;
- r = crypt_convert_scatterlist(cc, &sg_out, &sg_in, sg_in.length,
- bio_data_dir(ctx->bio_in) == WRITE, ctx->sector);
- if (r < 0)
- break;
+ /* sync */
+ case 0:
+ atomic_dec(&ctx->pending);
+ ctx->sector++;
+ continue;
- ctx->sector++;
+ /* error */
+ default:
+ atomic_dec(&ctx->pending);
+ return r;
+ }
}
- return r;
+ return 0;
}
static void dm_crypt_bio_destructor(struct bio *bio)
static void kcryptd_io_write(struct dm_crypt_io *io)
{
+ struct bio *clone = io->ctx.bio_out;
+ struct crypt_config *cc = io->target->private;
+
+ generic_make_request(clone);
+ wake_up(&cc->writeq);
}
static void kcryptd_io(struct work_struct *work)
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;
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)
r = crypt_convert(cc, &io->ctx);
- kcryptd_crypt_write_io_submit(io, r);
- if (unlikely(r < 0))
- return;
+ if (atomic_dec_and_test(&io->ctx.pending)) {
+ /* processed, no running async crypto */
+ kcryptd_crypt_write_io_submit(io, r, 0);
+ if (unlikely(r < 0))
+ return;
+ } else
+ atomic_inc(&io->pending);
/* out of memory -> run queues */
- if (unlikely(remaining))
+ if (unlikely(remaining)) {
+ /* wait for async crypto then reinitialize pending */
+ wait_event(cc->writeq, !atomic_read(&io->ctx.pending));
+ atomic_set(&io->ctx.pending, 1);
congestion_wait(WRITE, HZ/100);
+ }
}
}
struct crypt_config *cc = io->target->private;
int r = 0;
+ atomic_inc(&io->pending);
+
crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio,
io->sector);
r = crypt_convert(cc, &io->ctx);
- kcryptd_crypt_read_done(io, r);
+ if (atomic_dec_and_test(&io->ctx.pending))
+ kcryptd_crypt_read_done(io, r);
+
+ crypt_dec_pending(io);
+}
+
+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)
static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
{
struct crypt_config *cc;
- struct crypto_blkcipher *tfm;
+ struct crypto_ablkcipher *tfm;
char *tmp;
char *cipher;
char *chainmode;
goto bad_cipher;
}
- tfm = crypto_alloc_blkcipher(cc->cipher, 0, CRYPTO_ALG_ASYNC);
+ tfm = crypto_alloc_ablkcipher(cc->cipher, 0, 0);
if (IS_ERR(tfm)) {
ti->error = "Error allocating crypto tfm";
goto bad_cipher;
cc->iv_gen_ops->ctr(cc, ti, ivopts) < 0)
goto bad_ivmode;
- cc->iv_size = crypto_blkcipher_ivsize(tfm);
+ cc->iv_size = crypto_ablkcipher_ivsize(tfm);
if (cc->iv_size)
/* at least a 64 bit sector number should fit in our buffer */
cc->iv_size = max(cc->iv_size,
goto bad_slab_pool;
}
+ cc->dmreq_start = sizeof(struct ablkcipher_request);
+ cc->dmreq_start += crypto_ablkcipher_reqsize(tfm);
+ cc->dmreq_start = ALIGN(cc->dmreq_start, crypto_tfm_ctx_alignment());
+ cc->dmreq_start += crypto_ablkcipher_alignmask(tfm) &
+ ~(crypto_tfm_ctx_alignment() - 1);
+
+ 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";
goto bad_bs;
}
- if (crypto_blkcipher_setkey(tfm, cc->key, key_size) < 0) {
+ if (crypto_ablkcipher_setkey(tfm, cc->key, key_size) < 0) {
ti->error = "Error setting key";
goto bad_device;
}
goto bad_crypt_queue;
}
+ init_waitqueue_head(&cc->writeq);
ti->private = cc;
return 0;
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)
cc->iv_gen_ops->dtr(cc);
bad_ivmode:
- crypto_free_blkcipher(tfm);
+ crypto_free_ablkcipher(tfm);
bad_cipher:
/* Must zero key material before freeing */
memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8));
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);
if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
cc->iv_gen_ops->dtr(cc);
- crypto_free_blkcipher(cc->tfm);
+ crypto_free_ablkcipher(cc->tfm);
dm_put_device(ti, cc->dev);
/* Must zero key material before freeing */