/*
* Copyright (C) 2003 Christophe Saout <christophe@saout.de>
* Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org>
- * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2006-2009 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>
#include <linux/crypto.h>
#include <linux/workqueue.h>
#include <linux/backing-dev.h>
-#include <asm/atomic.h>
+#include <linux/percpu.h>
+#include <linux/atomic.h>
#include <linux/scatterlist.h>
#include <asm/page.h>
+#include <asm/unaligned.h>
+#include <crypto/hash.h>
+#include <crypto/md5.h>
+#include <crypto/algapi.h>
-#include "dm.h"
+#include <linux/device-mapper.h>
#define DM_MSG_PREFIX "crypt"
-#define MESG_STR(x) x, sizeof(x)
-
-/*
- * per bio private data
- */
-struct crypt_io {
- struct dm_target *target;
- struct bio *base_bio;
- struct bio *first_clone;
- struct work_struct work;
- atomic_t pending;
- int error;
- int post_process;
-};
/*
* 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;
- int write;
+ atomic_t pending;
+};
+
+/*
+ * per bio private data
+ */
+struct dm_crypt_io {
+ struct dm_target *target;
+ struct bio *base_bio;
+ struct work_struct work;
+
+ struct convert_context ctx;
+
+ atomic_t pending;
+ int error;
+ sector_t sector;
+ struct dm_crypt_io *base_io;
+};
+
+struct dm_crypt_request {
+ struct convert_context *ctx;
+ struct scatterlist sg_in;
+ struct scatterlist sg_out;
+ sector_t iv_sector;
};
struct crypt_config;
struct crypt_iv_operations {
int (*ctr)(struct crypt_config *cc, struct dm_target *ti,
- const char *opts);
+ const char *opts);
void (*dtr)(struct crypt_config *cc);
- const char *(*status)(struct crypt_config *cc);
- int (*generator)(struct crypt_config *cc, u8 *iv, sector_t sector);
+ int (*init)(struct crypt_config *cc);
+ int (*wipe)(struct crypt_config *cc);
+ int (*generator)(struct crypt_config *cc, u8 *iv,
+ struct dm_crypt_request *dmreq);
+ int (*post)(struct crypt_config *cc, u8 *iv,
+ struct dm_crypt_request *dmreq);
+};
+
+struct iv_essiv_private {
+ struct crypto_hash *hash_tfm;
+ u8 *salt;
+};
+
+struct iv_benbi_private {
+ int shift;
+};
+
+#define LMK_SEED_SIZE 64 /* hash + 0 */
+struct iv_lmk_private {
+ struct crypto_shash *hash_tfm;
+ u8 *seed;
};
/*
* 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;
+ /* ESSIV: struct crypto_cipher *essiv_tfm */
+ void *iv_private;
+ struct crypto_ablkcipher *tfms[0];
+};
+
+/*
+ * 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;
/*
- * 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;
- /*
- * crypto related data
- */
+ struct workqueue_struct *io_queue;
+ struct workqueue_struct *crypt_queue;
+
+ char *cipher;
+ char *cipher_string;
+
struct crypt_iv_operations *iv_gen_ops;
- char *iv_mode;
- struct crypto_cipher *iv_gen_private;
+ union {
+ struct iv_essiv_private essiv;
+ struct iv_benbi_private benbi;
+ struct iv_lmk_private lmk;
+ } iv_gen_private;
sector_t iv_offset;
unsigned int iv_size;
- char cipher[CRYPTO_MAX_ALG_NAME];
- char chainmode[CRYPTO_MAX_ALG_NAME];
- struct crypto_blkcipher *tfm;
+ /*
+ * Duplicated per cpu state. Access through
+ * per_cpu_ptr() only.
+ */
+ struct crypt_cpu __percpu *cpu;
+ unsigned tfms_count;
+
+ /*
+ * 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;
+
unsigned long flags;
unsigned int key_size;
+ unsigned int key_parts;
u8 key[0];
};
static struct kmem_cache *_crypt_io_pool;
+static void clone_init(struct dm_crypt_io *, struct bio *);
+static void kcryptd_queue_crypt(struct dm_crypt_io *io);
+static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq);
+
+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)->tfms[0];
+}
+
/*
* Different IV generation algorithms:
*
* plain: the initial vector is the 32-bit little-endian version of the sector
- * number, padded with zeros if neccessary.
+ * number, padded with zeros if necessary.
+ *
+ * plain64: the initial vector is the 64-bit little-endian version of the sector
+ * number, padded with zeros if necessary.
*
* essiv: "encrypted sector|salt initial vector", the sector number is
* encrypted with the bulk cipher using a salt as key. The salt
* should be derived from the bulk cipher's key via hashing.
*
+ * benbi: the 64-bit "big-endian 'narrow block'-count", starting at 1
+ * (needed for LRW-32-AES and possible other narrow block modes)
+ *
+ * null: the initial vector is always zero. Provides compatibility with
+ * obsolete loop_fish2 devices. Do not use for new devices.
+ *
+ * lmk: Compatible implementation of the block chaining mode used
+ * by the Loop-AES block device encryption system
+ * designed by Jari Ruusu. See http://loop-aes.sourceforge.net/
+ * It operates on full 512 byte sectors and uses CBC
+ * with an IV derived from the sector number, the data and
+ * optionally extra IV seed.
+ * This means that after decryption the first block
+ * of sector must be tweaked according to decrypted data.
+ * Loop-AES can use three encryption schemes:
+ * version 1: is plain aes-cbc mode
+ * version 2: uses 64 multikey scheme with lmk IV generator
+ * version 3: the same as version 2 with additional IV seed
+ * (it uses 65 keys, last key is used as IV seed)
+ *
* plumb: unimplemented, see:
* http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/454
*/
-static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, sector_t sector)
+static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv,
+ struct dm_crypt_request *dmreq)
{
memset(iv, 0, cc->iv_size);
- *(u32 *)iv = cpu_to_le32(sector & 0xffffffff);
+ *(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff);
return 0;
}
-static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti,
- const char *opts)
+static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv,
+ struct dm_crypt_request *dmreq)
{
- struct crypto_cipher *essiv_tfm;
- struct crypto_hash *hash_tfm;
+ memset(iv, 0, cc->iv_size);
+ *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
+
+ return 0;
+}
+
+/* Initialise ESSIV - compute salt but no local memory allocations */
+static int crypt_iv_essiv_init(struct crypt_config *cc)
+{
+ struct iv_essiv_private *essiv = &cc->iv_gen_private.essiv;
struct hash_desc desc;
struct scatterlist sg;
- unsigned int saltsize;
- u8 *salt;
- int err;
+ struct crypto_cipher *essiv_tfm;
+ int err, cpu;
- if (opts == NULL) {
- ti->error = "Digest algorithm missing for ESSIV mode";
- return -EINVAL;
- }
+ sg_init_one(&sg, cc->key, cc->key_size);
+ desc.tfm = essiv->hash_tfm;
+ desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
- /* Hash the cipher key with the given hash algorithm */
- hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC);
- if (IS_ERR(hash_tfm)) {
- ti->error = "Error initializing ESSIV hash";
- return PTR_ERR(hash_tfm);
- }
+ err = crypto_hash_digest(&desc, &sg, cc->key_size, essiv->salt);
+ if (err)
+ return err;
- saltsize = crypto_hash_digestsize(hash_tfm);
- salt = kmalloc(saltsize, GFP_KERNEL);
- if (salt == NULL) {
- ti->error = "Error kmallocing salt storage in ESSIV";
- crypto_free_hash(hash_tfm);
- return -ENOMEM;
+ 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;
}
- sg_set_buf(&sg, cc->key, cc->key_size);
- desc.tfm = hash_tfm;
- desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
- err = crypto_hash_digest(&desc, &sg, cc->key_size, salt);
- crypto_free_hash(hash_tfm);
+ return 0;
+}
- if (err) {
- ti->error = "Error calculating hash in ESSIV";
- return err;
+/* Wipe salt and reset key derived from volume key */
+static int crypt_iv_essiv_wipe(struct crypt_config *cc)
+{
+ 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);
+
+ 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";
- kfree(salt);
- return PTR_ERR(essiv_tfm);
+ return essiv_tfm;
}
+
if (crypto_cipher_blocksize(essiv_tfm) !=
- crypto_blkcipher_ivsize(cc->tfm)) {
+ crypto_ablkcipher_ivsize(any_tfm(cc))) {
ti->error = "Block size of ESSIV cipher does "
- "not match IV size of block cipher";
+ "not match IV size of block cipher";
crypto_free_cipher(essiv_tfm);
- kfree(salt);
- return -EINVAL;
+ 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);
- kfree(salt);
- return err;
+ 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_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,
+ const char *opts)
+{
+ struct crypto_cipher *essiv_tfm = NULL;
+ struct crypto_hash *hash_tfm = NULL;
+ u8 *salt = NULL;
+ int err, cpu;
+
+ if (!opts) {
+ ti->error = "Digest algorithm missing for ESSIV mode";
+ return -EINVAL;
}
+
+ /* Allocate hash algorithm */
+ hash_tfm = crypto_alloc_hash(opts, 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(hash_tfm)) {
+ ti->error = "Error initializing ESSIV hash";
+ err = PTR_ERR(hash_tfm);
+ goto bad;
+ }
+
+ salt = kzalloc(crypto_hash_digestsize(hash_tfm), GFP_KERNEL);
+ if (!salt) {
+ ti->error = "Error kmallocing salt storage in ESSIV";
+ err = -ENOMEM;
+ goto bad;
+ }
+
+ cc->iv_gen_private.essiv.salt = salt;
+ 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 (hash_tfm && !IS_ERR(hash_tfm))
+ crypto_free_hash(hash_tfm);
kfree(salt);
+ return err;
+}
+
+static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv,
+ struct dm_crypt_request *dmreq)
+{
+ struct crypto_cipher *essiv_tfm = this_crypt_config(cc)->iv_private;
+
+ memset(iv, 0, cc->iv_size);
+ *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
+ crypto_cipher_encrypt_one(essiv_tfm, iv, iv);
- cc->iv_gen_private = essiv_tfm;
return 0;
}
-static void crypt_iv_essiv_dtr(struct crypt_config *cc)
+static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti,
+ const char *opts)
{
- crypto_free_cipher(cc->iv_gen_private);
- cc->iv_gen_private = NULL;
+ unsigned bs = crypto_ablkcipher_blocksize(any_tfm(cc));
+ int log = ilog2(bs);
+
+ /* we need to calculate how far we must shift the sector count
+ * to get the cipher block count, we use this shift in _gen */
+
+ if (1 << log != bs) {
+ ti->error = "cypher blocksize is not a power of 2";
+ return -EINVAL;
+ }
+
+ if (log > 9) {
+ ti->error = "cypher blocksize is > 512";
+ return -EINVAL;
+ }
+
+ cc->iv_gen_private.benbi.shift = 9 - log;
+
+ return 0;
}
-static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, sector_t sector)
+static void crypt_iv_benbi_dtr(struct crypt_config *cc)
+{
+}
+
+static int crypt_iv_benbi_gen(struct crypt_config *cc, u8 *iv,
+ struct dm_crypt_request *dmreq)
+{
+ __be64 val;
+
+ memset(iv, 0, cc->iv_size - sizeof(u64)); /* rest is cleared below */
+
+ val = cpu_to_be64(((u64)dmreq->iv_sector << cc->iv_gen_private.benbi.shift) + 1);
+ put_unaligned(val, (__be64 *)(iv + cc->iv_size - sizeof(u64)));
+
+ return 0;
+}
+
+static int crypt_iv_null_gen(struct crypt_config *cc, u8 *iv,
+ struct dm_crypt_request *dmreq)
{
memset(iv, 0, cc->iv_size);
- *(u64 *)iv = cpu_to_le64(sector);
- crypto_cipher_encrypt_one(cc->iv_gen_private, iv, iv);
+
return 0;
}
+static void crypt_iv_lmk_dtr(struct crypt_config *cc)
+{
+ struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
+
+ if (lmk->hash_tfm && !IS_ERR(lmk->hash_tfm))
+ crypto_free_shash(lmk->hash_tfm);
+ lmk->hash_tfm = NULL;
+
+ kzfree(lmk->seed);
+ lmk->seed = NULL;
+}
+
+static int crypt_iv_lmk_ctr(struct crypt_config *cc, struct dm_target *ti,
+ const char *opts)
+{
+ struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
+
+ lmk->hash_tfm = crypto_alloc_shash("md5", 0, 0);
+ if (IS_ERR(lmk->hash_tfm)) {
+ ti->error = "Error initializing LMK hash";
+ return PTR_ERR(lmk->hash_tfm);
+ }
+
+ /* No seed in LMK version 2 */
+ if (cc->key_parts == cc->tfms_count) {
+ lmk->seed = NULL;
+ return 0;
+ }
+
+ lmk->seed = kzalloc(LMK_SEED_SIZE, GFP_KERNEL);
+ if (!lmk->seed) {
+ crypt_iv_lmk_dtr(cc);
+ ti->error = "Error kmallocing seed storage in LMK";
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static int crypt_iv_lmk_init(struct crypt_config *cc)
+{
+ struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
+ int subkey_size = cc->key_size / cc->key_parts;
+
+ /* LMK seed is on the position of LMK_KEYS + 1 key */
+ if (lmk->seed)
+ memcpy(lmk->seed, cc->key + (cc->tfms_count * subkey_size),
+ crypto_shash_digestsize(lmk->hash_tfm));
+
+ return 0;
+}
+
+static int crypt_iv_lmk_wipe(struct crypt_config *cc)
+{
+ struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
+
+ if (lmk->seed)
+ memset(lmk->seed, 0, LMK_SEED_SIZE);
+
+ return 0;
+}
+
+static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv,
+ struct dm_crypt_request *dmreq,
+ u8 *data)
+{
+ struct iv_lmk_private *lmk = &cc->iv_gen_private.lmk;
+ struct {
+ struct shash_desc desc;
+ char ctx[crypto_shash_descsize(lmk->hash_tfm)];
+ } sdesc;
+ struct md5_state md5state;
+ u32 buf[4];
+ int i, r;
+
+ sdesc.desc.tfm = lmk->hash_tfm;
+ sdesc.desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
+
+ r = crypto_shash_init(&sdesc.desc);
+ if (r)
+ return r;
+
+ if (lmk->seed) {
+ r = crypto_shash_update(&sdesc.desc, lmk->seed, LMK_SEED_SIZE);
+ if (r)
+ return r;
+ }
+
+ /* Sector is always 512B, block size 16, add data of blocks 1-31 */
+ r = crypto_shash_update(&sdesc.desc, data + 16, 16 * 31);
+ if (r)
+ return r;
+
+ /* Sector is cropped to 56 bits here */
+ buf[0] = cpu_to_le32(dmreq->iv_sector & 0xFFFFFFFF);
+ buf[1] = cpu_to_le32((((u64)dmreq->iv_sector >> 32) & 0x00FFFFFF) | 0x80000000);
+ buf[2] = cpu_to_le32(4024);
+ buf[3] = 0;
+ r = crypto_shash_update(&sdesc.desc, (u8 *)buf, sizeof(buf));
+ if (r)
+ return r;
+
+ /* No MD5 padding here */
+ r = crypto_shash_export(&sdesc.desc, &md5state);
+ if (r)
+ return r;
+
+ for (i = 0; i < MD5_HASH_WORDS; i++)
+ __cpu_to_le32s(&md5state.hash[i]);
+ memcpy(iv, &md5state.hash, cc->iv_size);
+
+ return 0;
+}
+
+static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv,
+ struct dm_crypt_request *dmreq)
+{
+ u8 *src;
+ int r = 0;
+
+ if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
+ src = kmap_atomic(sg_page(&dmreq->sg_in), KM_USER0);
+ r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset);
+ kunmap_atomic(src, KM_USER0);
+ } else
+ memset(iv, 0, cc->iv_size);
+
+ return r;
+}
+
+static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv,
+ struct dm_crypt_request *dmreq)
+{
+ u8 *dst;
+ int r;
+
+ if (bio_data_dir(dmreq->ctx->bio_in) == WRITE)
+ return 0;
+
+ dst = kmap_atomic(sg_page(&dmreq->sg_out), KM_USER0);
+ r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset);
+
+ /* Tweak the first block of plaintext sector */
+ if (!r)
+ crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size);
+
+ kunmap_atomic(dst, KM_USER0);
+ return r;
+}
+
static struct crypt_iv_operations crypt_iv_plain_ops = {
.generator = crypt_iv_plain_gen
};
+static struct crypt_iv_operations crypt_iv_plain64_ops = {
+ .generator = crypt_iv_plain64_gen
+};
+
static struct crypt_iv_operations crypt_iv_essiv_ops = {
.ctr = crypt_iv_essiv_ctr,
.dtr = crypt_iv_essiv_dtr,
+ .init = crypt_iv_essiv_init,
+ .wipe = crypt_iv_essiv_wipe,
.generator = crypt_iv_essiv_gen
};
+static struct crypt_iv_operations crypt_iv_benbi_ops = {
+ .ctr = crypt_iv_benbi_ctr,
+ .dtr = crypt_iv_benbi_dtr,
+ .generator = crypt_iv_benbi_gen
+};
-static int
-crypt_convert_scatterlist(struct crypt_config *cc, struct scatterlist *out,
- struct scatterlist *in, unsigned int length,
- int write, sector_t sector)
+static struct crypt_iv_operations crypt_iv_null_ops = {
+ .generator = crypt_iv_null_gen
+};
+
+static struct crypt_iv_operations crypt_iv_lmk_ops = {
+ .ctr = crypt_iv_lmk_ctr,
+ .dtr = crypt_iv_lmk_dtr,
+ .init = crypt_iv_lmk_init,
+ .wipe = crypt_iv_lmk_wipe,
+ .generator = crypt_iv_lmk_gen,
+ .post = crypt_iv_lmk_post
+};
+
+static void crypt_convert_init(struct crypt_config *cc,
+ struct convert_context *ctx,
+ struct bio *bio_out, struct bio *bio_in,
+ sector_t sector)
{
- u8 iv[cc->iv_size];
- struct blkcipher_desc desc = {
- .tfm = cc->tfm,
- .info = iv,
- .flags = CRYPTO_TFM_REQ_MAY_SLEEP,
- };
- int r;
+ ctx->bio_in = bio_in;
+ ctx->bio_out = bio_out;
+ ctx->offset_in = 0;
+ ctx->offset_out = 0;
+ 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);
+}
+
+static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc,
+ struct ablkcipher_request *req)
+{
+ return (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
+}
+
+static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc,
+ struct dm_crypt_request *dmreq)
+{
+ return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start);
+}
+
+static u8 *iv_of_dmreq(struct crypt_config *cc,
+ struct dm_crypt_request *dmreq)
+{
+ return (u8 *)ALIGN((unsigned long)(dmreq + 1),
+ crypto_ablkcipher_alignmask(any_tfm(cc)) + 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 = dmreq_of_req(cc, req);
+ iv = iv_of_dmreq(cc, dmreq);
+
+ dmreq->iv_sector = ctx->sector;
+ dmreq->ctx = ctx;
+ 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, sector);
+ r = cc->iv_gen_ops->generator(cc, iv, dmreq);
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);
}
+ 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);
+
+ if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
+ r = cc->iv_gen_ops->post(cc, iv, dmreq);
+
return r;
}
-static void
-crypt_convert_init(struct crypt_config *cc, struct convert_context *ctx,
- struct bio *bio_out, struct bio *bio_in,
- sector_t sector, int write)
+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)
{
- ctx->bio_in = bio_in;
- ctx->bio_out = bio_out;
- ctx->offset_in = 0;
- ctx->offset_out = 0;
- 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;
- ctx->write = write;
+ struct crypt_cpu *this_cc = this_crypt_config(cc);
+ unsigned key_index = ctx->sector & (cc->tfms_count - 1);
+
+ if (!this_cc->req)
+ this_cc->req = mempool_alloc(cc->req_pool, GFP_NOIO);
+
+ ablkcipher_request_set_tfm(this_cc->req, this_cc->tfms[key_index]);
+ 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));
}
/*
* Encrypt / decrypt data from one bio to another one (can be the same one)
*/
static int crypt_convert(struct crypt_config *cc,
- struct convert_context *ctx)
+ struct convert_context *ctx)
{
- int r = 0;
+ struct crypt_cpu *this_cc = this_crypt_config(cc);
+ int r;
+
+ atomic_set(&ctx->pending, 1);
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 = {
- .page = bv_in->bv_page,
- .offset = bv_in->bv_offset + ctx->offset_in,
- .length = 1 << SECTOR_SHIFT
- };
- struct scatterlist sg_out = {
- .page = bv_out->bv_page,
- .offset = bv_out->bv_offset + ctx->offset_out,
- .length = 1 << SECTOR_SHIFT
- };
-
- ctx->offset_in += sg_in.length;
- if (ctx->offset_in >= bv_in->bv_len) {
- ctx->offset_in = 0;
- ctx->idx_in++;
- }
- ctx->offset_out += sg_out.length;
- if (ctx->offset_out >= bv_out->bv_len) {
- ctx->offset_out = 0;
- ctx->idx_out++;
+ crypt_alloc_req(cc, ctx);
+
+ atomic_inc(&ctx->pending);
+
+ r = crypt_convert_block(cc, ctx, this_cc->req);
+
+ switch (r) {
+ /* async */
+ case -EBUSY:
+ wait_for_completion(&ctx->restart);
+ INIT_COMPLETION(ctx->restart);
+ /* fall through*/
+ case -EINPROGRESS:
+ this_cc->req = NULL;
+ ctx->sector++;
+ continue;
+
+ /* sync */
+ case 0:
+ atomic_dec(&ctx->pending);
+ ctx->sector++;
+ cond_resched();
+ continue;
+
+ /* error */
+ default:
+ atomic_dec(&ctx->pending);
+ return r;
}
-
- r = crypt_convert_scatterlist(cc, &sg_out, &sg_in, sg_in.length,
- ctx->write, ctx->sector);
- if (r < 0)
- break;
-
- ctx->sector++;
}
- return r;
+ return 0;
}
- static void dm_crypt_bio_destructor(struct bio *bio)
- {
- struct crypt_io *io = bio->bi_private;
+static void dm_crypt_bio_destructor(struct bio *bio)
+{
+ struct dm_crypt_io *io = bio->bi_private;
struct crypt_config *cc = io->target->private;
bio_free(bio, cc->bs);
- }
+}
/*
* Generate a new unfragmented bio with the given size
* This should never violate the device limitations
- * May return a smaller bio when running out of pages
+ * May return a smaller bio when running out of pages, indicated by
+ * *out_of_pages set to 1.
*/
-static struct bio *
-crypt_alloc_buffer(struct crypt_config *cc, unsigned int size,
- struct bio *base_bio, unsigned int *bio_vec_idx)
+static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size,
+ unsigned *out_of_pages)
{
+ struct crypt_config *cc = io->target->private;
struct bio *clone;
unsigned int nr_iovecs = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM;
- unsigned int i;
-
- if (base_bio) {
- clone = bio_alloc_bioset(GFP_NOIO, base_bio->bi_max_vecs, cc->bs);
- __bio_clone(clone, base_bio);
- } else
- clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs);
+ unsigned i, len;
+ struct page *page;
+ clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs);
if (!clone)
return NULL;
- clone->bi_destructor = dm_crypt_bio_destructor;
-
- /* if the last bio was not complete, continue where that one ended */
- clone->bi_idx = *bio_vec_idx;
- clone->bi_vcnt = *bio_vec_idx;
- clone->bi_size = 0;
- clone->bi_flags &= ~(1 << BIO_SEG_VALID);
-
- /* clone->bi_idx pages have already been allocated */
- size -= clone->bi_idx * PAGE_SIZE;
-
- for (i = clone->bi_idx; i < nr_iovecs; i++) {
- struct bio_vec *bv = bio_iovec_idx(clone, i);
+ clone_init(io, clone);
+ *out_of_pages = 0;
- bv->bv_page = mempool_alloc(cc->page_pool, gfp_mask);
- if (!bv->bv_page)
+ for (i = 0; i < nr_iovecs; i++) {
+ page = mempool_alloc(cc->page_pool, gfp_mask);
+ if (!page) {
+ *out_of_pages = 1;
break;
+ }
/*
* if additional pages cannot be allocated without waiting,
* return a partially allocated bio, the caller will then try
* to allocate additional bios while submitting this partial bio
*/
- if ((i - clone->bi_idx) == (MIN_BIO_PAGES - 1))
+ if (i == (MIN_BIO_PAGES - 1))
gfp_mask = (gfp_mask | __GFP_NOWARN) & ~__GFP_WAIT;
- bv->bv_offset = 0;
- if (size > PAGE_SIZE)
- bv->bv_len = PAGE_SIZE;
- else
- bv->bv_len = size;
+ len = (size > PAGE_SIZE) ? PAGE_SIZE : size;
- clone->bi_size += bv->bv_len;
- clone->bi_vcnt++;
- size -= bv->bv_len;
+ if (!bio_add_page(clone, page, len, 0)) {
+ mempool_free(page, cc->page_pool);
+ break;
+ }
+
+ size -= len;
}
if (!clone->bi_size) {
return NULL;
}
- /*
- * Remember the last bio_vec allocated to be able
- * to correctly continue after the splitting.
- */
- *bio_vec_idx = clone->bi_vcnt;
-
return clone;
}
-static void crypt_free_buffer_pages(struct crypt_config *cc,
- struct bio *clone, unsigned int bytes)
+static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
{
- unsigned int i, start, end;
+ unsigned int i;
struct bio_vec *bv;
- /*
- * This is ugly, but Jens Axboe thinks that using bi_idx in the
- * endio function is too dangerous at the moment, so I calculate the
- * correct position using bi_vcnt and bi_size.
- * The bv_offset and bv_len fields might already be modified but we
- * know that we always allocated whole pages.
- * A fix to the bi_idx issue in the kernel is in the works, so
- * we will hopefully be able to revert to the cleaner solution soon.
- */
- i = clone->bi_vcnt - 1;
- bv = bio_iovec_idx(clone, i);
- end = (i << PAGE_SHIFT) + (bv->bv_offset + bv->bv_len) - clone->bi_size;
- start = end - bytes;
-
- start >>= PAGE_SHIFT;
- if (!clone->bi_size)
- end = clone->bi_vcnt;
- else
- end >>= PAGE_SHIFT;
-
- for (i = start; i < end; i++) {
+ for (i = 0; i < clone->bi_vcnt; i++) {
bv = bio_iovec_idx(clone, i);
BUG_ON(!bv->bv_page);
mempool_free(bv->bv_page, cc->page_pool);
}
}
+static struct dm_crypt_io *crypt_io_alloc(struct dm_target *ti,
+ struct bio *bio, sector_t sector)
+{
+ struct crypt_config *cc = ti->private;
+ struct dm_crypt_io *io;
+
+ io = mempool_alloc(cc->io_pool, GFP_NOIO);
+ io->target = ti;
+ io->base_bio = bio;
+ io->sector = sector;
+ io->error = 0;
+ io->base_io = NULL;
+ atomic_set(&io->pending, 0);
+
+ return io;
+}
+
+static void crypt_inc_pending(struct dm_crypt_io *io)
+{
+ atomic_inc(&io->pending);
+}
+
/*
* One of the bios was finished. Check for completion of
* the whole request and correctly clean up the buffer.
+ * If base_io is set, wait for the last fragment to complete.
*/
-static void dec_pending(struct crypt_io *io, int error)
+static void crypt_dec_pending(struct dm_crypt_io *io)
{
- struct crypt_config *cc = (struct crypt_config *) io->target->private;
-
- if (error < 0)
- io->error = error;
+ struct crypt_config *cc = io->target->private;
+ struct bio *base_bio = io->base_bio;
+ struct dm_crypt_io *base_io = io->base_io;
+ int error = io->error;
if (!atomic_dec_and_test(&io->pending))
return;
- if (io->first_clone)
- bio_put(io->first_clone);
-
- bio_endio(io->base_bio, io->base_bio->bi_size, io->error);
-
mempool_free(io, cc->io_pool);
+
+ if (likely(!base_io))
+ bio_endio(base_bio, error);
+ else {
+ if (error && !base_io->error)
+ base_io->error = error;
+ crypt_dec_pending(base_io);
+ }
}
/*
- * kcryptd:
+ * kcryptd/kcryptd_io:
*
* Needed because it would be very unwise to do decryption in an
* interrupt context.
+ *
+ * kcryptd performs the actual encryption or decryption.
+ *
+ * kcryptd_io performs the IO submission.
+ *
+ * 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 struct workqueue_struct *_kcryptd_workqueue;
-static void kcryptd_do_work(struct work_struct *work);
-
-static void kcryptd_queue_io(struct crypt_io *io)
-{
- INIT_WORK(&io->work, kcryptd_do_work);
- queue_work(_kcryptd_workqueue, &io->work);
-}
-
-static int crypt_endio(struct bio *clone, unsigned int done, int error)
+static void crypt_endio(struct bio *clone, int error)
{
- struct crypt_io *io = clone->bi_private;
+ struct dm_crypt_io *io = clone->bi_private;
struct crypt_config *cc = io->target->private;
- unsigned read_io = bio_data_dir(clone) == READ;
+ unsigned rw = bio_data_dir(clone);
+
+ if (unlikely(!bio_flagged(clone, BIO_UPTODATE) && !error))
+ error = -EIO;
/*
- * free the processed pages, even if
- * it's only a partially completed write
+ * free the processed pages
*/
- if (!read_io)
- crypt_free_buffer_pages(cc, clone, done);
+ if (rw == WRITE)
+ crypt_free_buffer_pages(cc, clone);
- /* keep going - not finished yet */
- if (unlikely(clone->bi_size))
- return 1;
-
- if (!read_io)
- goto out;
+ bio_put(clone);
- if (unlikely(!bio_flagged(clone, BIO_UPTODATE))) {
- error = -EIO;
- goto out;
+ if (rw == READ && !error) {
+ kcryptd_queue_crypt(io);
+ return;
}
- bio_put(clone);
- io->post_process = 1;
- kcryptd_queue_io(io);
- return 0;
+ if (unlikely(error))
+ io->error = error;
-out:
- bio_put(clone);
- dec_pending(io, error);
- return error;
+ crypt_dec_pending(io);
}
-static void clone_init(struct crypt_io *io, struct bio *clone)
+static void clone_init(struct dm_crypt_io *io, struct bio *clone)
{
struct crypt_config *cc = io->target->private;
clone->bi_end_io = crypt_endio;
clone->bi_bdev = cc->dev->bdev;
clone->bi_rw = io->base_bio->bi_rw;
+ clone->bi_destructor = dm_crypt_bio_destructor;
}
-static void process_read(struct crypt_io *io)
+static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp)
{
struct crypt_config *cc = io->target->private;
struct bio *base_bio = io->base_bio;
struct bio *clone;
- sector_t sector = base_bio->bi_sector - io->target->begin;
- atomic_inc(&io->pending);
+ /*
+ * The block layer might modify the bvec array, so always
+ * copy the required bvecs because we need the original
+ * one in order to decrypt the whole bio data *afterwards*.
+ */
+ clone = bio_alloc_bioset(gfp, bio_segments(base_bio), cc->bs);
+ if (!clone)
+ return 1;
+
+ crypt_inc_pending(io);
+
+ clone_init(io, clone);
+ clone->bi_idx = 0;
+ clone->bi_vcnt = bio_segments(base_bio);
+ clone->bi_size = base_bio->bi_size;
+ clone->bi_sector = cc->start + io->sector;
+ memcpy(clone->bi_io_vec, bio_iovec(base_bio),
+ sizeof(struct bio_vec) * clone->bi_vcnt);
+
+ generic_make_request(clone);
+ return 0;
+}
+
+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)
+{
+ struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
+
+ if (bio_data_dir(io->base_bio) == READ) {
+ crypt_inc_pending(io);
+ if (kcryptd_io_read(io, GFP_NOIO))
+ io->error = -ENOMEM;
+ crypt_dec_pending(io);
+ } else
+ kcryptd_io_write(io);
+}
+
+static void kcryptd_queue_io(struct dm_crypt_io *io)
+{
+ struct crypt_config *cc = io->target->private;
+
+ INIT_WORK(&io->work, kcryptd_io);
+ queue_work(cc->io_queue, &io->work);
+}
+
+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;
- /*
- * The block layer might modify the bvec array, so always
- * copy the required bvecs because we need the original
- * one in order to decrypt the whole bio data *afterwards*.
- */
- clone = bio_alloc_bioset(GFP_NOIO, bio_segments(base_bio), cc->bs);
- if (unlikely(!clone)) {
- dec_pending(io, -ENOMEM);
+ if (unlikely(error < 0)) {
+ crypt_free_buffer_pages(cc, clone);
+ bio_put(clone);
+ io->error = -EIO;
+ crypt_dec_pending(io);
return;
}
- clone_init(io, clone);
- clone->bi_destructor = dm_crypt_bio_destructor;
- clone->bi_idx = 0;
- clone->bi_vcnt = bio_segments(base_bio);
- clone->bi_size = base_bio->bi_size;
- clone->bi_sector = cc->start + sector;
- memcpy(clone->bi_io_vec, bio_iovec(base_bio),
- sizeof(struct bio_vec) * clone->bi_vcnt);
+ /* crypt_convert should have filled the clone bio */
+ BUG_ON(io->ctx.idx_out < clone->bi_vcnt);
- generic_make_request(clone);
+ clone->bi_sector = cc->start + io->sector;
+
+ if (async)
+ kcryptd_queue_io(io);
+ else
+ generic_make_request(clone);
}
-static void process_write(struct crypt_io *io)
+static void kcryptd_crypt_write_convert(struct dm_crypt_io *io)
{
struct crypt_config *cc = io->target->private;
- struct bio *base_bio = io->base_bio;
struct bio *clone;
- struct convert_context ctx;
- unsigned remaining = base_bio->bi_size;
- sector_t sector = base_bio->bi_sector - io->target->begin;
- unsigned bvec_idx = 0;
-
- atomic_inc(&io->pending);
+ struct dm_crypt_io *new_io;
+ int crypt_finished;
+ unsigned out_of_pages = 0;
+ unsigned remaining = io->base_bio->bi_size;
+ sector_t sector = io->sector;
+ int r;
- crypt_convert_init(cc, &ctx, NULL, base_bio, sector, 1);
+ /*
+ * Prevent io from disappearing until this function completes.
+ */
+ crypt_inc_pending(io);
+ crypt_convert_init(cc, &io->ctx, NULL, io->base_bio, sector);
/*
* The allocated buffers can be smaller than the whole bio,
* so repeat the whole process until all the data can be handled.
*/
while (remaining) {
- clone = crypt_alloc_buffer(cc, base_bio->bi_size,
- io->first_clone, &bvec_idx);
+ clone = crypt_alloc_buffer(io, remaining, &out_of_pages);
if (unlikely(!clone)) {
- dec_pending(io, -ENOMEM);
- return;
+ io->error = -ENOMEM;
+ break;
}
- ctx.bio_out = clone;
+ io->ctx.bio_out = clone;
+ io->ctx.idx_out = 0;
+
+ remaining -= clone->bi_size;
+ sector += bio_sectors(clone);
+
+ crypt_inc_pending(io);
+ r = crypt_convert(cc, &io->ctx);
+ crypt_finished = atomic_dec_and_test(&io->ctx.pending);
+
+ /* Encryption was already finished, submit io now */
+ if (crypt_finished) {
+ kcryptd_crypt_write_io_submit(io, r, 0);
+
+ /*
+ * If there was an error, do not try next fragments.
+ * For async, error is processed in async handler.
+ */
+ if (unlikely(r < 0))
+ break;
- if (unlikely(crypt_convert(cc, &ctx) < 0)) {
- crypt_free_buffer_pages(cc, clone, clone->bi_size);
- bio_put(clone);
- dec_pending(io, -EIO);
- return;
+ io->sector = sector;
}
- clone_init(io, clone);
- clone->bi_sector = cc->start + sector;
+ /*
+ * Out of memory -> run queues
+ * But don't wait if split was due to the io size restriction
+ */
+ if (unlikely(out_of_pages))
+ congestion_wait(BLK_RW_ASYNC, HZ/100);
+
+ /*
+ * With async crypto it is unsafe to share the crypto context
+ * between fragments, so switch to a new dm_crypt_io structure.
+ */
+ if (unlikely(!crypt_finished && remaining)) {
+ new_io = crypt_io_alloc(io->target, io->base_bio,
+ sector);
+ crypt_inc_pending(new_io);
+ crypt_convert_init(cc, &new_io->ctx, NULL,
+ io->base_bio, sector);
+ new_io->ctx.idx_in = io->ctx.idx_in;
+ new_io->ctx.offset_in = io->ctx.offset_in;
- if (!io->first_clone) {
/*
- * hold a reference to the first clone, because it
- * holds the bio_vec array and that can't be freed
- * before all other clones are released
+ * Fragments after the first use the base_io
+ * pending count.
*/
- bio_get(clone);
- io->first_clone = clone;
+ if (!io->base_io)
+ new_io->base_io = io;
+ else {
+ new_io->base_io = io->base_io;
+ crypt_inc_pending(io->base_io);
+ crypt_dec_pending(io);
+ }
+
+ io = new_io;
}
+ }
- remaining -= clone->bi_size;
- sector += bio_sectors(clone);
+ crypt_dec_pending(io);
+}
- /* prevent bio_put of first_clone */
- if (remaining)
- atomic_inc(&io->pending);
+static void kcryptd_crypt_read_done(struct dm_crypt_io *io, int error)
+{
+ if (unlikely(error < 0))
+ io->error = -EIO;
- generic_make_request(clone);
+ crypt_dec_pending(io);
+}
- /* out of memory -> run queues */
- if (remaining)
- congestion_wait(bio_data_dir(clone), HZ/100);
- }
+static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
+{
+ struct crypt_config *cc = io->target->private;
+ int r = 0;
+
+ crypt_inc_pending(io);
+
+ crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio,
+ io->sector);
+
+ r = crypt_convert(cc, &io->ctx);
+
+ if (atomic_dec_and_test(&io->ctx.pending))
+ kcryptd_crypt_read_done(io, r);
+
+ crypt_dec_pending(io);
}
-static void process_read_endio(struct crypt_io *io)
+static void kcryptd_async_done(struct crypto_async_request *async_req,
+ int error)
{
+ struct dm_crypt_request *dmreq = async_req->data;
+ struct convert_context *ctx = dmreq->ctx;
+ struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
struct crypt_config *cc = io->target->private;
- struct convert_context ctx;
- crypt_convert_init(cc, &ctx, io->base_bio, io->base_bio,
- io->base_bio->bi_sector - io->target->begin, 0);
+ if (error == -EINPROGRESS) {
+ complete(&ctx->restart);
+ return;
+ }
+
+ if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post)
+ error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq);
+
+ mempool_free(req_of_dmreq(cc, dmreq), cc->req_pool);
- dec_pending(io, crypt_convert(cc, &ctx));
+ 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_do_work(struct work_struct *work)
+static void kcryptd_crypt(struct work_struct *work)
{
- struct crypt_io *io = container_of(work, struct crypt_io, work);
+ struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
- if (io->post_process)
- process_read_endio(io);
- else if (bio_data_dir(io->base_bio) == READ)
- process_read(io);
+ if (bio_data_dir(io->base_bio) == READ)
+ kcryptd_crypt_read_convert(io);
else
- process_write(io);
+ kcryptd_crypt_write_convert(io);
+}
+
+static void kcryptd_queue_crypt(struct dm_crypt_io *io)
+{
+ struct crypt_config *cc = io->target->private;
+
+ INIT_WORK(&io->work, kcryptd_crypt);
+ queue_work(cc->crypt_queue, &io->work);
}
/*
}
}
+static void crypt_free_tfms(struct crypt_config *cc, int cpu)
+{
+ struct crypt_cpu *cpu_cc = per_cpu_ptr(cc->cpu, cpu);
+ unsigned i;
+
+ for (i = 0; i < cc->tfms_count; i++)
+ if (cpu_cc->tfms[i] && !IS_ERR(cpu_cc->tfms[i])) {
+ crypto_free_ablkcipher(cpu_cc->tfms[i]);
+ cpu_cc->tfms[i] = NULL;
+ }
+}
+
+static int crypt_alloc_tfms(struct crypt_config *cc, int cpu, char *ciphermode)
+{
+ struct crypt_cpu *cpu_cc = per_cpu_ptr(cc->cpu, cpu);
+ unsigned i;
+ int err;
+
+ for (i = 0; i < cc->tfms_count; i++) {
+ cpu_cc->tfms[i] = crypto_alloc_ablkcipher(ciphermode, 0, 0);
+ if (IS_ERR(cpu_cc->tfms[i])) {
+ err = PTR_ERR(cpu_cc->tfms[i]);
+ crypt_free_tfms(cc, cpu);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static int crypt_setkey_allcpus(struct crypt_config *cc)
+{
+ unsigned subkey_size = cc->key_size >> ilog2(cc->tfms_count);
+ int cpu, err = 0, i, r;
+
+ for_each_possible_cpu(cpu) {
+ for (i = 0; i < cc->tfms_count; i++) {
+ r = crypto_ablkcipher_setkey(per_cpu_ptr(cc->cpu, cpu)->tfms[i],
+ cc->key + (i * subkey_size), subkey_size);
+ if (r)
+ err = r;
+ }
+ }
+
+ return err;
+}
+
static int crypt_set_key(struct crypt_config *cc, char *key)
{
- unsigned key_size = strlen(key) >> 1;
+ int r = -EINVAL;
+ int key_string_len = strlen(key);
- if (cc->key_size && cc->key_size != key_size)
- return -EINVAL;
+ /* The key size may not be changed. */
+ if (cc->key_size != (key_string_len >> 1))
+ goto out;
- cc->key_size = key_size; /* initial settings */
+ /* Hyphen (which gives a key_size of zero) means there is no key. */
+ if (!cc->key_size && strcmp(key, "-"))
+ goto out;
- if ((!key_size && strcmp(key, "-")) ||
- (key_size && crypt_decode_key(cc->key, key, key_size) < 0))
- return -EINVAL;
+ if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0)
+ goto out;
set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
- return 0;
+ r = crypt_setkey_allcpus(cc);
+
+out:
+ /* Hex key string not needed after here, so wipe it. */
+ memset(key, '0', key_string_len);
+
+ return r;
}
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 0;
+
+ return crypt_setkey_allcpus(cc);
}
-/*
- * Construct an encryption mapping:
- * <cipher> <key> <iv_offset> <dev_path> <start>
- */
-static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
+static void crypt_dtr(struct dm_target *ti)
{
- struct crypt_config *cc;
- struct crypto_blkcipher *tfm;
- char *tmp;
- char *cipher;
- char *chainmode;
- char *ivmode;
- char *ivopts;
- unsigned int key_size;
- unsigned long long tmpll;
+ struct crypt_config *cc = ti->private;
+ struct crypt_cpu *cpu_cc;
+ int cpu;
- if (argc != 5) {
- ti->error = "Not enough arguments";
+ ti->private = NULL;
+
+ if (!cc)
+ return;
+
+ if (cc->io_queue)
+ destroy_workqueue(cc->io_queue);
+ 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);
+ crypt_free_tfms(cc, cpu);
+ }
+
+ if (cc->bs)
+ bioset_free(cc->bs);
+
+ if (cc->page_pool)
+ mempool_destroy(cc->page_pool);
+ if (cc->req_pool)
+ mempool_destroy(cc->req_pool);
+ if (cc->io_pool)
+ mempool_destroy(cc->io_pool);
+
+ if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
+ cc->iv_gen_ops->dtr(cc);
+
+ if (cc->dev)
+ dm_put_device(ti, cc->dev);
+
+ if (cc->cpu)
+ free_percpu(cc->cpu);
+
+ kzfree(cc->cipher);
+ kzfree(cc->cipher_string);
+
+ /* Must zero key material before freeing */
+ kzfree(cc);
+}
+
+static int crypt_ctr_cipher(struct dm_target *ti,
+ char *cipher_in, char *key)
+{
+ struct crypt_config *cc = ti->private;
+ char *tmp, *cipher, *chainmode, *ivmode, *ivopts, *keycount;
+ char *cipher_api = NULL;
+ int cpu, ret = -EINVAL;
+
+ /* Convert to crypto api definition? */
+ if (strchr(cipher_in, '(')) {
+ ti->error = "Bad cipher specification";
+ return -EINVAL;
+ }
+
+ cc->cipher_string = kstrdup(cipher_in, GFP_KERNEL);
+ if (!cc->cipher_string)
+ goto bad_mem;
+
+ /*
+ * Legacy dm-crypt cipher specification
+ * cipher[:keycount]-mode-iv:ivopts
+ */
+ tmp = cipher_in;
+ keycount = strsep(&tmp, "-");
+ cipher = strsep(&keycount, ":");
+
+ if (!keycount)
+ cc->tfms_count = 1;
+ else if (sscanf(keycount, "%u", &cc->tfms_count) != 1 ||
+ !is_power_of_2(cc->tfms_count)) {
+ ti->error = "Bad cipher key count specification";
return -EINVAL;
}
+ cc->key_parts = cc->tfms_count;
+
+ cc->cipher = kstrdup(cipher, GFP_KERNEL);
+ if (!cc->cipher)
+ goto bad_mem;
- tmp = argv[0];
- cipher = strsep(&tmp, "-");
chainmode = strsep(&tmp, "-");
ivopts = strsep(&tmp, "-");
ivmode = strsep(&ivopts, ":");
if (tmp)
- DMWARN("Unexpected additional cipher options");
-
- key_size = strlen(argv[1]) >> 1;
-
- cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL);
- if (cc == NULL) {
- ti->error =
- "Cannot allocate transparent encryption context";
- return -ENOMEM;
- }
-
- if (crypt_set_key(cc, argv[1])) {
- ti->error = "Error decoding key";
- goto bad1;
+ DMWARN("Ignoring unexpected additional cipher options");
+
+ cc->cpu = __alloc_percpu(sizeof(*(cc->cpu)) +
+ cc->tfms_count * sizeof(*(cc->cpu->tfms)),
+ __alignof__(struct crypt_cpu));
+ if (!cc->cpu) {
+ ti->error = "Cannot allocate per cpu state";
+ goto bad_mem;
}
- /* Compatiblity mode for old dm-crypt cipher strings */
- if (!chainmode || (strcmp(chainmode, "plain") == 0 && !ivmode)) {
+ /*
+ * For compatibility with the original dm-crypt mapping format, if
+ * only the cipher name is supplied, use cbc-plain.
+ */
+ if (!chainmode || (!strcmp(chainmode, "plain") && !ivmode)) {
chainmode = "cbc";
ivmode = "plain";
}
if (strcmp(chainmode, "ecb") && !ivmode) {
- ti->error = "This chaining mode requires an IV mechanism";
- goto bad1;
+ ti->error = "IV mechanism required";
+ return -EINVAL;
}
- if (snprintf(cc->cipher, CRYPTO_MAX_ALG_NAME, "%s(%s)", chainmode,
- cipher) >= CRYPTO_MAX_ALG_NAME) {
- ti->error = "Chain mode + cipher name is too long";
- goto bad1;
+ cipher_api = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL);
+ if (!cipher_api)
+ goto bad_mem;
+
+ ret = snprintf(cipher_api, CRYPTO_MAX_ALG_NAME,
+ "%s(%s)", chainmode, cipher);
+ if (ret < 0) {
+ kfree(cipher_api);
+ goto bad_mem;
}
- tfm = crypto_alloc_blkcipher(cc->cipher, 0, CRYPTO_ALG_ASYNC);
- if (IS_ERR(tfm)) {
- ti->error = "Error allocating crypto tfm";
- goto bad1;
+ /* Allocate cipher */
+ for_each_possible_cpu(cpu) {
+ ret = crypt_alloc_tfms(cc, cpu, cipher_api);
+ if (ret < 0) {
+ ti->error = "Error allocating crypto tfm";
+ goto bad;
+ }
}
- strcpy(cc->cipher, cipher);
- strcpy(cc->chainmode, chainmode);
- cc->tfm = tfm;
+ /* Initialize and set key */
+ ret = crypt_set_key(cc, key);
+ if (ret < 0) {
+ ti->error = "Error decoding and setting key";
+ goto bad;
+ }
- /*
- * Choose ivmode. Valid modes: "plain", "essiv:<esshash>".
- * See comments at iv code
- */
+ /* Initialize IV */
+ 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,
+ (unsigned int)(sizeof(u64) / sizeof(u8)));
+ else if (ivmode) {
+ DMWARN("Selected cipher does not support IVs");
+ ivmode = NULL;
+ }
+ /* Choose ivmode, see comments at iv code. */
if (ivmode == NULL)
cc->iv_gen_ops = NULL;
else if (strcmp(ivmode, "plain") == 0)
cc->iv_gen_ops = &crypt_iv_plain_ops;
+ else if (strcmp(ivmode, "plain64") == 0)
+ cc->iv_gen_ops = &crypt_iv_plain64_ops;
else if (strcmp(ivmode, "essiv") == 0)
cc->iv_gen_ops = &crypt_iv_essiv_ops;
- else {
+ else if (strcmp(ivmode, "benbi") == 0)
+ cc->iv_gen_ops = &crypt_iv_benbi_ops;
+ else if (strcmp(ivmode, "null") == 0)
+ cc->iv_gen_ops = &crypt_iv_null_ops;
+ else if (strcmp(ivmode, "lmk") == 0) {
+ cc->iv_gen_ops = &crypt_iv_lmk_ops;
+ /* Version 2 and 3 is recognised according
+ * to length of provided multi-key string.
+ * If present (version 3), last key is used as IV seed.
+ */
+ if (cc->key_size % cc->key_parts)
+ cc->key_parts++;
+ } else {
+ ret = -EINVAL;
ti->error = "Invalid IV mode";
- goto bad2;
+ goto bad;
}
- if (cc->iv_gen_ops && cc->iv_gen_ops->ctr &&
- cc->iv_gen_ops->ctr(cc, ti, ivopts) < 0)
- goto bad2;
+ /* Allocate IV */
+ if (cc->iv_gen_ops && cc->iv_gen_ops->ctr) {
+ ret = cc->iv_gen_ops->ctr(cc, ti, ivopts);
+ if (ret < 0) {
+ ti->error = "Error creating IV";
+ goto bad;
+ }
+ }
- cc->iv_size = crypto_blkcipher_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,
- (unsigned int)(sizeof(u64) / sizeof(u8)));
- else {
- if (cc->iv_gen_ops) {
- DMWARN("Selected cipher does not support IVs");
- if (cc->iv_gen_ops->dtr)
- cc->iv_gen_ops->dtr(cc);
- cc->iv_gen_ops = NULL;
+ /* Initialize IV (set keys for ESSIV etc) */
+ if (cc->iv_gen_ops && cc->iv_gen_ops->init) {
+ ret = cc->iv_gen_ops->init(cc);
+ if (ret < 0) {
+ ti->error = "Error initialising IV";
+ goto bad;
}
}
+ ret = 0;
+bad:
+ kfree(cipher_api);
+ return ret;
+
+bad_mem:
+ ti->error = "Cannot allocate cipher strings";
+ return -ENOMEM;
+}
+
+/*
+ * Construct an encryption mapping:
+ * <cipher> <key> <iv_offset> <dev_path> <start>
+ */
+static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
+{
+ struct crypt_config *cc;
+ unsigned int key_size, opt_params;
+ unsigned long long tmpll;
+ int ret;
+ struct dm_arg_set as;
+ const char *opt_string;
+
+ static struct dm_arg _args[] = {
+ {0, 1, "Invalid number of feature args"},
+ };
+
+ if (argc < 5) {
+ ti->error = "Not enough arguments";
+ return -EINVAL;
+ }
+
+ key_size = strlen(argv[1]) >> 1;
+
+ cc = kzalloc(sizeof(*cc) + key_size * sizeof(u8), GFP_KERNEL);
+ if (!cc) {
+ ti->error = "Cannot allocate encryption context";
+ return -ENOMEM;
+ }
+ cc->key_size = key_size;
+
+ ti->private = cc;
+ ret = crypt_ctr_cipher(ti, argv[0], argv[1]);
+ if (ret < 0)
+ goto bad;
+
+ ret = -ENOMEM;
cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool);
if (!cc->io_pool) {
ti->error = "Cannot allocate crypt io mempool";
- goto bad3;
+ goto bad;
+ }
+
+ cc->dmreq_start = sizeof(struct ablkcipher_request);
+ 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(any_tfm(cc)) &
+ ~(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;
}
cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0);
if (!cc->page_pool) {
ti->error = "Cannot allocate page mempool";
- goto bad4;
+ goto bad;
}
- cc->bs = bioset_create(MIN_IOS, MIN_IOS, 4);
+ cc->bs = bioset_create(MIN_IOS, 0);
if (!cc->bs) {
ti->error = "Cannot allocate crypt bioset";
- goto bad_bs;
- }
-
- if (crypto_blkcipher_setkey(tfm, cc->key, key_size) < 0) {
- ti->error = "Error setting key";
- goto bad5;
+ goto bad;
}
+ ret = -EINVAL;
if (sscanf(argv[2], "%llu", &tmpll) != 1) {
ti->error = "Invalid iv_offset sector";
- goto bad5;
+ goto bad;
}
cc->iv_offset = tmpll;
+ if (dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev)) {
+ ti->error = "Device lookup failed";
+ goto bad;
+ }
+
if (sscanf(argv[4], "%llu", &tmpll) != 1) {
ti->error = "Invalid device sector";
- goto bad5;
+ goto bad;
}
cc->start = tmpll;
- if (dm_get_device(ti, argv[3], cc->start, ti->len,
- dm_table_get_mode(ti->table), &cc->dev)) {
- ti->error = "Device lookup failed";
- goto bad5;
- }
+ argv += 5;
+ argc -= 5;
- if (ivmode && cc->iv_gen_ops) {
- if (ivopts)
- *(ivopts - 1) = ':';
- cc->iv_mode = kmalloc(strlen(ivmode) + 1, GFP_KERNEL);
- if (!cc->iv_mode) {
- ti->error = "Error kmallocing iv_mode string";
- goto bad5;
- }
- strcpy(cc->iv_mode, ivmode);
- } else
- cc->iv_mode = NULL;
+ /* Optional parameters */
+ if (argc) {
+ as.argc = argc;
+ as.argv = argv;
- ti->private = cc;
- return 0;
+ ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error);
+ if (ret)
+ goto bad;
-bad5:
- bioset_free(cc->bs);
-bad_bs:
- mempool_destroy(cc->page_pool);
-bad4:
- mempool_destroy(cc->io_pool);
-bad3:
- if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
- cc->iv_gen_ops->dtr(cc);
-bad2:
- crypto_free_blkcipher(tfm);
-bad1:
- /* Must zero key material before freeing */
- memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8));
- kfree(cc);
- return -EINVAL;
-}
+ opt_string = dm_shift_arg(&as);
-static void crypt_dtr(struct dm_target *ti)
-{
- struct crypt_config *cc = (struct crypt_config *) ti->private;
+ if (opt_params == 1 && opt_string &&
+ !strcasecmp(opt_string, "allow_discards"))
+ ti->num_discard_requests = 1;
+ else if (opt_params) {
+ ret = -EINVAL;
+ ti->error = "Invalid feature arguments";
+ goto bad;
+ }
+ }
- bioset_free(cc->bs);
- mempool_destroy(cc->page_pool);
- mempool_destroy(cc->io_pool);
+ ret = -ENOMEM;
+ 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;
+ }
- 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);
- dm_put_device(ti, cc->dev);
+ 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;
+ }
- /* Must zero key material before freeing */
- memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8));
- kfree(cc);
+ ti->num_flush_requests = 1;
+ return 0;
+
+bad:
+ crypt_dtr(ti);
+ return ret;
}
static int crypt_map(struct dm_target *ti, struct bio *bio,
union map_info *map_context)
{
- struct crypt_config *cc = ti->private;
- struct crypt_io *io;
+ struct dm_crypt_io *io;
+ struct crypt_config *cc;
- io = mempool_alloc(cc->io_pool, GFP_NOIO);
- io->target = ti;
- io->base_bio = bio;
- io->first_clone = NULL;
- io->error = io->post_process = 0;
- atomic_set(&io->pending, 0);
- kcryptd_queue_io(io);
+ /*
+ * If bio is REQ_FLUSH or REQ_DISCARD, just bypass crypt queues.
+ * - for REQ_FLUSH device-mapper core ensures that no IO is in-flight
+ * - for REQ_DISCARD caller must use flush if IO ordering matters
+ */
+ if (unlikely(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))) {
+ cc = ti->private;
+ bio->bi_bdev = cc->dev->bdev;
+ if (bio_sectors(bio))
+ bio->bi_sector = cc->start + dm_target_offset(ti, bio->bi_sector);
+ return DM_MAPIO_REMAPPED;
+ }
- return 0;
+ io = crypt_io_alloc(ti, bio, dm_target_offset(ti, bio->bi_sector));
+
+ if (bio_data_dir(io->base_bio) == READ) {
+ if (kcryptd_io_read(io, GFP_NOWAIT))
+ kcryptd_queue_io(io);
+ } else
+ kcryptd_queue_crypt(io);
+
+ return DM_MAPIO_SUBMITTED;
}
static int crypt_status(struct dm_target *ti, status_type_t type,
char *result, unsigned int maxlen)
{
- struct crypt_config *cc = (struct crypt_config *) ti->private;
+ struct crypt_config *cc = ti->private;
unsigned int sz = 0;
switch (type) {
break;
case STATUSTYPE_TABLE:
- if (cc->iv_mode)
- DMEMIT("%s-%s-%s ", cc->cipher, cc->chainmode,
- cc->iv_mode);
- else
- DMEMIT("%s-%s ", cc->cipher, cc->chainmode);
+ DMEMIT("%s ", cc->cipher_string);
if (cc->key_size > 0) {
if ((maxlen - sz) < ((cc->key_size << 1) + 1))
DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset,
cc->dev->name, (unsigned long long)cc->start);
+
+ if (ti->num_discard_requests)
+ DMEMIT(" 1 allow_discards");
+
break;
}
return 0;
static int crypt_message(struct dm_target *ti, unsigned argc, char **argv)
{
struct crypt_config *cc = ti->private;
+ int ret = -EINVAL;
if (argc < 2)
goto error;
- if (!strnicmp(argv[0], MESG_STR("key"))) {
+ if (!strcasecmp(argv[0], "key")) {
if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) {
DMWARN("not suspended during key manipulation.");
return -EINVAL;
}
- if (argc == 3 && !strnicmp(argv[1], MESG_STR("set")))
- return crypt_set_key(cc, argv[2]);
- if (argc == 2 && !strnicmp(argv[1], MESG_STR("wipe")))
+ if (argc == 3 && !strcasecmp(argv[1], "set")) {
+ ret = crypt_set_key(cc, argv[2]);
+ if (ret)
+ return ret;
+ if (cc->iv_gen_ops && cc->iv_gen_ops->init)
+ ret = cc->iv_gen_ops->init(cc);
+ return ret;
+ }
+ if (argc == 2 && !strcasecmp(argv[1], "wipe")) {
+ if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) {
+ ret = cc->iv_gen_ops->wipe(cc);
+ if (ret)
+ return ret;
+ }
return crypt_wipe_key(cc);
+ }
}
error:
return -EINVAL;
}
+static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
+ struct bio_vec *biovec, int max_size)
+{
+ struct crypt_config *cc = ti->private;
+ struct request_queue *q = bdev_get_queue(cc->dev->bdev);
+
+ if (!q->merge_bvec_fn)
+ return max_size;
+
+ bvm->bi_bdev = cc->dev->bdev;
+ bvm->bi_sector = cc->start + dm_target_offset(ti, bvm->bi_sector);
+
+ return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
+}
+
+static int crypt_iterate_devices(struct dm_target *ti,
+ iterate_devices_callout_fn fn, void *data)
+{
+ struct crypt_config *cc = ti->private;
+
+ return fn(ti, cc->dev, cc->start, ti->len, data);
+}
+
static struct target_type crypt_target = {
.name = "crypt",
- .version= {1, 3, 0},
+ .version = {1, 11, 0},
.module = THIS_MODULE,
.ctr = crypt_ctr,
.dtr = crypt_dtr,
.preresume = crypt_preresume,
.resume = crypt_resume,
.message = crypt_message,
+ .merge = crypt_merge,
+ .iterate_devices = crypt_iterate_devices,
};
static int __init dm_crypt_init(void)
{
int r;
- _crypt_io_pool = kmem_cache_create("dm-crypt_io",
- sizeof(struct crypt_io),
- 0, 0, NULL, NULL);
+ _crypt_io_pool = KMEM_CACHE(dm_crypt_io, 0);
if (!_crypt_io_pool)
return -ENOMEM;
- _kcryptd_workqueue = create_workqueue("kcryptd");
- if (!_kcryptd_workqueue) {
- r = -ENOMEM;
- DMERR("couldn't create kcryptd");
- goto bad1;
- }
-
r = dm_register_target(&crypt_target);
if (r < 0) {
DMERR("register failed %d", r);
- goto bad2;
+ kmem_cache_destroy(_crypt_io_pool);
}
- return 0;
-
-bad2:
- destroy_workqueue(_kcryptd_workqueue);
-bad1:
- kmem_cache_destroy(_crypt_io_pool);
return r;
}
static void __exit dm_crypt_exit(void)
{
- int r = dm_unregister_target(&crypt_target);
-
- if (r < 0)
- DMERR("unregister failed %d", r);
-
- destroy_workqueue(_kcryptd_workqueue);
+ dm_unregister_target(&crypt_target);
kmem_cache_destroy(_crypt_io_pool);
}
Code Review / linux-2.6.git / blobdiff