#include <linux/crypto.h>
#include <linux/workqueue.h>
#include <linux/backing-dev.h>
+#include <linux/percpu.h>
#include <asm/atomic.h>
#include <linux/scatterlist.h>
#include <asm/page.h>
};
struct iv_essiv_private {
- struct crypto_cipher *tfm;
struct crypto_hash *hash_tfm;
u8 *salt;
};
* and encrypts / decrypts at the same time.
*/
enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID };
+
+/*
+ * Duplicated per-CPU state for cipher.
+ */
+struct crypt_cpu {
+ struct ablkcipher_request *req;
+ struct crypto_ablkcipher *tfm;
+
+ /* ESSIV: struct crypto_cipher *essiv_tfm */
+ void *iv_private;
+};
+
+/*
+ * The fields in here must be read only after initialization,
+ * changing state should be in crypt_cpu.
+ */
struct crypt_config {
struct dm_dev *dev;
sector_t start;
sector_t iv_offset;
unsigned int iv_size;
+ /*
+ * Duplicated per cpu state. Access through
+ * per_cpu_ptr() only.
+ */
+ struct crypt_cpu __percpu *cpu;
+
/*
* Layout of each crypto request:
*
* correctly aligned.
*/
unsigned int dmreq_start;
- struct ablkcipher_request *req;
- struct crypto_ablkcipher *tfm;
unsigned long flags;
unsigned int key_size;
u8 key[0];
static void clone_init(struct dm_crypt_io *, struct bio *);
static void kcryptd_queue_crypt(struct dm_crypt_io *io);
+static struct crypt_cpu *this_crypt_config(struct crypt_config *cc)
+{
+ return this_cpu_ptr(cc->cpu);
+}
+
+/*
+ * Use this to access cipher attributes that are the same for each CPU.
+ */
+static struct crypto_ablkcipher *any_tfm(struct crypt_config *cc)
+{
+ return __this_cpu_ptr(cc->cpu)->tfm;
+}
+
/*
* Different IV generation algorithms:
*
struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
struct hash_desc desc;
struct scatterlist sg;
- int err;
+ struct crypto_cipher *essiv_tfm;
+ int err, cpu;
sg_init_one(&sg, cc->key, cc->key_size);
desc.tfm = essiv->hash_tfm;
if (err)
return err;
- return crypto_cipher_setkey(essiv->tfm, essiv->salt,
+ for_each_possible_cpu(cpu) {
+ essiv_tfm = per_cpu_ptr(cc->cpu, cpu)->iv_private,
+
+ err = crypto_cipher_setkey(essiv_tfm, essiv->salt,
crypto_hash_digestsize(essiv->hash_tfm));
+ if (err)
+ return err;
+ }
+
+ return 0;
}
/* Wipe salt and reset key derived from volume key */
{
struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
unsigned salt_size = crypto_hash_digestsize(essiv->hash_tfm);
+ struct crypto_cipher *essiv_tfm;
+ int cpu, r, err = 0;
memset(essiv->salt, 0, salt_size);
- return crypto_cipher_setkey(essiv->tfm, essiv->salt, salt_size);
+ for_each_possible_cpu(cpu) {
+ essiv_tfm = per_cpu_ptr(cc->cpu, cpu)->iv_private;
+ r = crypto_cipher_setkey(essiv_tfm, essiv->salt, salt_size);
+ if (r)
+ err = r;
+ }
+
+ return err;
+}
+
+/* Set up per cpu cipher state */
+static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc,
+ struct dm_target *ti,
+ u8 *salt, unsigned saltsize)
+{
+ struct crypto_cipher *essiv_tfm;
+ int err;
+
+ /* Setup the essiv_tfm with the given salt */
+ essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(essiv_tfm)) {
+ ti->error = "Error allocating crypto tfm for ESSIV";
+ return essiv_tfm;
+ }
+
+ if (crypto_cipher_blocksize(essiv_tfm) !=
+ crypto_ablkcipher_ivsize(any_tfm(cc))) {
+ ti->error = "Block size of ESSIV cipher does "
+ "not match IV size of block cipher";
+ crypto_free_cipher(essiv_tfm);
+ return ERR_PTR(-EINVAL);
+ }
+
+ err = crypto_cipher_setkey(essiv_tfm, salt, saltsize);
+ if (err) {
+ ti->error = "Failed to set key for ESSIV cipher";
+ crypto_free_cipher(essiv_tfm);
+ return ERR_PTR(err);
+ }
+
+ return essiv_tfm;
}
static void crypt_iv_essiv_dtr(struct crypt_config *cc)
{
+ int cpu;
+ struct crypt_cpu *cpu_cc;
+ struct crypto_cipher *essiv_tfm;
struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
- crypto_free_cipher(essiv->tfm);
- essiv->tfm = NULL;
-
crypto_free_hash(essiv->hash_tfm);
essiv->hash_tfm = NULL;
kzfree(essiv->salt);
essiv->salt = NULL;
+
+ for_each_possible_cpu(cpu) {
+ cpu_cc = per_cpu_ptr(cc->cpu, cpu);
+ essiv_tfm = cpu_cc->iv_private;
+
+ if (essiv_tfm)
+ crypto_free_cipher(essiv_tfm);
+
+ cpu_cc->iv_private = NULL;
+ }
}
static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti,
struct crypto_cipher *essiv_tfm = NULL;
struct crypto_hash *hash_tfm = NULL;
u8 *salt = NULL;
- int err;
+ int err, cpu;
if (!opts) {
ti->error = "Digest algorithm missing for ESSIV mode";
goto bad;
}
- /* Allocate essiv_tfm */
- essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC);
- if (IS_ERR(essiv_tfm)) {
- ti->error = "Error allocating crypto tfm for ESSIV";
- err = PTR_ERR(essiv_tfm);
- goto bad;
- }
- if (crypto_cipher_blocksize(essiv_tfm) !=
- crypto_ablkcipher_ivsize(cc->tfm)) {
- ti->error = "Block size of ESSIV cipher does "
- "not match IV size of block cipher";
- err = -EINVAL;
- goto bad;
- }
-
cc->iv_gen_private.essiv.salt = salt;
- cc->iv_gen_private.essiv.tfm = essiv_tfm;
cc->iv_gen_private.essiv.hash_tfm = hash_tfm;
+ for_each_possible_cpu(cpu) {
+ essiv_tfm = setup_essiv_cpu(cc, ti, salt,
+ crypto_hash_digestsize(hash_tfm));
+ if (IS_ERR(essiv_tfm)) {
+ crypt_iv_essiv_dtr(cc);
+ return PTR_ERR(essiv_tfm);
+ }
+ per_cpu_ptr(cc->cpu, cpu)->iv_private = essiv_tfm;
+ }
+
return 0;
bad:
- if (essiv_tfm && !IS_ERR(essiv_tfm))
- crypto_free_cipher(essiv_tfm);
if (hash_tfm && !IS_ERR(hash_tfm))
crypto_free_hash(hash_tfm);
kfree(salt);
static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, sector_t sector)
{
+ struct crypto_cipher *essiv_tfm = this_crypt_config(cc)->iv_private;
+
memset(iv, 0, cc->iv_size);
*(u64 *)iv = cpu_to_le64(sector);
- crypto_cipher_encrypt_one(cc->iv_gen_private.essiv.tfm, iv, iv);
+ crypto_cipher_encrypt_one(essiv_tfm, iv, iv);
+
return 0;
}
static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti,
const char *opts)
{
- unsigned bs = crypto_ablkcipher_blocksize(cc->tfm);
+ unsigned bs = crypto_ablkcipher_blocksize(any_tfm(cc));
int log = ilog2(bs);
/* we need to calculate how far we must shift the sector count
dmreq = dmreq_of_req(cc, req);
iv = (u8 *)ALIGN((unsigned long)(dmreq + 1),
- crypto_ablkcipher_alignmask(cc->tfm) + 1);
+ crypto_ablkcipher_alignmask(any_tfm(cc)) + 1);
dmreq->ctx = ctx;
sg_init_table(&dmreq->sg_in, 1);
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,
- dmreq_of_req(cc, cc->req));
+ struct crypt_cpu *this_cc = this_crypt_config(cc);
+
+ if (!this_cc->req)
+ this_cc->req = mempool_alloc(cc->req_pool, GFP_NOIO);
+
+ ablkcipher_request_set_tfm(this_cc->req, this_cc->tfm);
+ ablkcipher_request_set_callback(this_cc->req,
+ CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
+ kcryptd_async_done, dmreq_of_req(cc, this_cc->req));
}
/*
static int crypt_convert(struct crypt_config *cc,
struct convert_context *ctx)
{
+ struct crypt_cpu *this_cc = this_crypt_config(cc);
int r;
atomic_set(&ctx->pending, 1);
atomic_inc(&ctx->pending);
- r = crypt_convert_block(cc, ctx, cc->req);
+ r = crypt_convert_block(cc, ctx, this_cc->req);
switch (r) {
/* async */
INIT_COMPLETION(ctx->restart);
/* fall through*/
case -EINPROGRESS:
- cc->req = NULL;
+ this_cc->req = NULL;
ctx->sector++;
continue;
* They must be separated as otherwise the final stages could be
* starved by new requests which can block in the first stages due
* to memory allocation.
+ *
+ * The work is done per CPU global for all dm-crypt instances.
+ * They should not depend on each other and do not block.
*/
static void crypt_endio(struct bio *clone, int error)
{
}
}
+static int crypt_setkey_allcpus(struct crypt_config *cc)
+{
+ int cpu, err = 0, r;
+
+ for_each_possible_cpu(cpu) {
+ r = crypto_ablkcipher_setkey(per_cpu_ptr(cc->cpu, cpu)->tfm,
+ cc->key, cc->key_size);
+ if (r)
+ err = r;
+ }
+
+ return err;
+}
+
static int crypt_set_key(struct crypt_config *cc, char *key)
{
/* The key size may not be changed. */
set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
- return crypto_ablkcipher_setkey(cc->tfm, cc->key, cc->key_size);
+ return crypt_setkey_allcpus(cc);
}
static int crypt_wipe_key(struct crypt_config *cc)
{
clear_bit(DM_CRYPT_KEY_VALID, &cc->flags);
memset(&cc->key, 0, cc->key_size * sizeof(u8));
- return crypto_ablkcipher_setkey(cc->tfm, cc->key, cc->key_size);
+
+ return crypt_setkey_allcpus(cc);
}
static void crypt_dtr(struct dm_target *ti)
{
struct crypt_config *cc = ti->private;
+ struct crypt_cpu *cpu_cc;
+ int cpu;
ti->private = NULL;
if (cc->crypt_queue)
destroy_workqueue(cc->crypt_queue);
+ if (cc->cpu)
+ for_each_possible_cpu(cpu) {
+ cpu_cc = per_cpu_ptr(cc->cpu, cpu);
+ if (cpu_cc->req)
+ mempool_free(cpu_cc->req, cc->req_pool);
+ if (cpu_cc->tfm)
+ crypto_free_ablkcipher(cpu_cc->tfm);
+ }
+
if (cc->bs)
bioset_free(cc->bs);
if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
cc->iv_gen_ops->dtr(cc);
- if (cc->tfm && !IS_ERR(cc->tfm))
- crypto_free_ablkcipher(cc->tfm);
-
if (cc->dev)
dm_put_device(ti, cc->dev);
+ if (cc->cpu)
+ free_percpu(cc->cpu);
+
kzfree(cc->cipher);
kzfree(cc->cipher_string);
char *cipher_in, char *key)
{
struct crypt_config *cc = ti->private;
+ struct crypto_ablkcipher *tfm;
char *tmp, *cipher, *chainmode, *ivmode, *ivopts;
char *cipher_api = NULL;
- int ret = -EINVAL;
+ int cpu, ret = -EINVAL;
/* Convert to crypto api definition? */
if (strchr(cipher_in, '(')) {
if (tmp)
DMWARN("Ignoring unexpected additional cipher options");
+ cc->cpu = alloc_percpu(struct crypt_cpu);
+ if (!cc->cpu) {
+ ti->error = "Cannot allocate per cpu state";
+ goto bad_mem;
+ }
+
/*
* For compatibility with the original dm-crypt mapping format, if
* only the cipher name is supplied, use cbc-plain.
}
/* Allocate cipher */
- cc->tfm = crypto_alloc_ablkcipher(cipher_api, 0, 0);
- if (IS_ERR(cc->tfm)) {
- ret = PTR_ERR(cc->tfm);
- ti->error = "Error allocating crypto tfm";
- goto bad;
+ for_each_possible_cpu(cpu) {
+ tfm = crypto_alloc_ablkcipher(cipher_api, 0, 0);
+ if (IS_ERR(tfm)) {
+ ret = PTR_ERR(tfm);
+ ti->error = "Error allocating crypto tfm";
+ goto bad;
+ }
+ per_cpu_ptr(cc->cpu, cpu)->tfm = tfm;
}
/* Initialize and set key */
}
/* Initialize IV */
- cc->iv_size = crypto_ablkcipher_ivsize(cc->tfm);
+ cc->iv_size = crypto_ablkcipher_ivsize(any_tfm(cc));
if (cc->iv_size)
/* at least a 64 bit sector number should fit in our buffer */
cc->iv_size = max(cc->iv_size,
}
cc->dmreq_start = sizeof(struct ablkcipher_request);
- cc->dmreq_start += crypto_ablkcipher_reqsize(cc->tfm);
+ cc->dmreq_start += crypto_ablkcipher_reqsize(any_tfm(cc));
cc->dmreq_start = ALIGN(cc->dmreq_start, crypto_tfm_ctx_alignment());
- cc->dmreq_start += crypto_ablkcipher_alignmask(cc->tfm) &
+ cc->dmreq_start += crypto_ablkcipher_alignmask(any_tfm(cc)) &
~(crypto_tfm_ctx_alignment() - 1);
cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start +
ti->error = "Cannot allocate crypt request mempool";
goto bad;
}
- cc->req = NULL;
cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0);
if (!cc->page_pool) {
cc->start = tmpll;
ret = -ENOMEM;
- cc->io_queue = create_singlethread_workqueue("kcryptd_io");
+ cc->io_queue = alloc_workqueue("kcryptd_io",
+ WQ_NON_REENTRANT|
+ WQ_MEM_RECLAIM,
+ 1);
if (!cc->io_queue) {
ti->error = "Couldn't create kcryptd io queue";
goto bad;
}
- cc->crypt_queue = create_singlethread_workqueue("kcryptd");
+ cc->crypt_queue = alloc_workqueue("kcryptd",
+ WQ_NON_REENTRANT|
+ WQ_CPU_INTENSIVE|
+ WQ_MEM_RECLAIM,
+ 1);
if (!cc->crypt_queue) {
ti->error = "Couldn't create kcryptd queue";
goto bad;
static struct target_type crypt_target = {
.name = "crypt",
- .version = {1, 8, 0},
+ .version = {1, 9, 0},
.module = THIS_MODULE,
.ctr = crypt_ctr,
.dtr = crypt_dtr,
projects / users / willy / pagecache.git / commitdiff