Merge tag 'ecryptfs-3.10-rc1-ablkcipher' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs

Pull eCryptfs update from Tyler Hicks:
 "Improve performance when AES-NI (and most likely other crypto
  accelerators) is available by moving to the ablkcipher crypto API.
  The improvement is more apparent on faster storage devices.

  There's no noticeable change when hardware crypto is not available"

* tag 'ecryptfs-3.10-rc1-ablkcipher' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs:
  eCryptfs: Use the ablkcipher crypto API

2 files changed, 103 insertions, 41 deletions

diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index d5c25db4398f..f71ec125290d 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -243,7 +243,7 @@ void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat)
         struct ecryptfs_key_sig *key_sig, *key_sig_tmp;
 
         if (crypt_stat->tfm)
-                crypto_free_blkcipher(crypt_stat->tfm);
+                crypto_free_ablkcipher(crypt_stat->tfm);
         if (crypt_stat->hash_tfm)
                 crypto_free_hash(crypt_stat->hash_tfm);
         list_for_each_entry_safe(key_sig, key_sig_tmp,
@@ -319,6 +319,22 @@ int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
         return i;
 }
 
+struct extent_crypt_result {
+        struct completion completion;
+        int rc;
+};
+
+static void extent_crypt_complete(struct crypto_async_request *req, int rc)
+{
+        struct extent_crypt_result *ecr = req->data;
+
+        if (rc == -EINPROGRESS)
+                return;
+
+        ecr->rc = rc;
+        complete(&ecr->completion);
+}
+
 /**
  * encrypt_scatterlist
  * @crypt_stat: Pointer to the crypt_stat struct to initialize.
@@ -334,11 +350,8 @@ static int encrypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
                                struct scatterlist *src_sg, int size,
                                unsigned char *iv)
 {
-        struct blkcipher_desc desc = {
-                .tfm = crypt_stat->tfm,
-                .info = iv,
-                .flags = CRYPTO_TFM_REQ_MAY_SLEEP
-        };
+        struct ablkcipher_request *req = NULL;
+        struct extent_crypt_result ecr;
         int rc = 0;
 
         BUG_ON(!crypt_stat || !crypt_stat->tfm
@@ -349,24 +362,47 @@ static int encrypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
                 ecryptfs_dump_hex(crypt_stat->key,
                                   crypt_stat->key_size);
         }
-        /* Consider doing this once, when the file is opened */
+
+        init_completion(&ecr.completion);
+
         mutex_lock(&crypt_stat->cs_tfm_mutex);
-        if (!(crypt_stat->flags & ECRYPTFS_KEY_SET)) {
-                rc = crypto_blkcipher_setkey(crypt_stat->tfm, crypt_stat->key,
-                                             crypt_stat->key_size);
-                crypt_stat->flags |= ECRYPTFS_KEY_SET;
-        }
-        if (rc) {
-                ecryptfs_printk(KERN_ERR, "Error setting key; rc = [%d]\n",
-                                rc);
+        req = ablkcipher_request_alloc(crypt_stat->tfm, GFP_NOFS);
+        if (!req) {
                 mutex_unlock(&crypt_stat->cs_tfm_mutex);
-                rc = -EINVAL;
+                rc = -ENOMEM;
                 goto out;
         }
-        ecryptfs_printk(KERN_DEBUG, "Encrypting [%d] bytes.\n", size);
-        crypto_blkcipher_encrypt_iv(&desc, dest_sg, src_sg, size);
+
+        ablkcipher_request_set_callback(req,
+                        CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
+                        extent_crypt_complete, &ecr);
+        /* Consider doing this once, when the file is opened */
+        if (!(crypt_stat->flags & ECRYPTFS_KEY_SET)) {
+                rc = crypto_ablkcipher_setkey(crypt_stat->tfm, crypt_stat->key,
+                                              crypt_stat->key_size);
+                if (rc) {
+                        ecryptfs_printk(KERN_ERR,
+                                        "Error setting key; rc = [%d]\n",
+                                        rc);
+                        mutex_unlock(&crypt_stat->cs_tfm_mutex);
+                        rc = -EINVAL;
+                        goto out;
+                }
+                crypt_stat->flags |= ECRYPTFS_KEY_SET;
+        }
         mutex_unlock(&crypt_stat->cs_tfm_mutex);
+        ecryptfs_printk(KERN_DEBUG, "Encrypting [%d] bytes.\n", size);
+        ablkcipher_request_set_crypt(req, src_sg, dest_sg, size, iv);
+        rc = crypto_ablkcipher_encrypt(req);
+        if (rc == -EINPROGRESS || rc == -EBUSY) {
+                struct extent_crypt_result *ecr = req->base.data;
+
+                wait_for_completion(&ecr->completion);
+                rc = ecr->rc;
+                INIT_COMPLETION(ecr->completion);
+        }
 out:
+        ablkcipher_request_free(req);
         return rc;
 }
 
@@ -624,35 +660,61 @@ static int decrypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
                                struct scatterlist *src_sg, int size,
                                unsigned char *iv)
 {
-        struct blkcipher_desc desc = {
-                .tfm = crypt_stat->tfm,
-                .info = iv,
-                .flags = CRYPTO_TFM_REQ_MAY_SLEEP
-        };
+        struct ablkcipher_request *req = NULL;
+        struct extent_crypt_result ecr;
         int rc = 0;
 
-        /* Consider doing this once, when the file is opened */
+        BUG_ON(!crypt_stat || !crypt_stat->tfm
+               || !(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED));
+        if (unlikely(ecryptfs_verbosity > 0)) {
+                ecryptfs_printk(KERN_DEBUG, "Key size [%zd]; key:\n",
+                                crypt_stat->key_size);
+                ecryptfs_dump_hex(crypt_stat->key,
+                                  crypt_stat->key_size);
+        }
+
+        init_completion(&ecr.completion);
+
         mutex_lock(&crypt_stat->cs_tfm_mutex);
-        rc = crypto_blkcipher_setkey(crypt_stat->tfm, crypt_stat->key,
-                                     crypt_stat->key_size);
-        if (rc) {
-                ecryptfs_printk(KERN_ERR, "Error setting key; rc = [%d]\n",
-                                rc);
+        req = ablkcipher_request_alloc(crypt_stat->tfm, GFP_NOFS);
+        if (!req) {
                 mutex_unlock(&crypt_stat->cs_tfm_mutex);
-                rc = -EINVAL;
+                rc = -ENOMEM;
                 goto out;
         }
-        ecryptfs_printk(KERN_DEBUG, "Decrypting [%d] bytes.\n", size);
-        rc = crypto_blkcipher_decrypt_iv(&desc, dest_sg, src_sg, size);
+
+        ablkcipher_request_set_callback(req,
+                        CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
+                        extent_crypt_complete, &ecr);
+        /* Consider doing this once, when the file is opened */
+        if (!(crypt_stat->flags & ECRYPTFS_KEY_SET)) {
+                rc = crypto_ablkcipher_setkey(crypt_stat->tfm, crypt_stat->key,
+                                              crypt_stat->key_size);
+                if (rc) {
+                        ecryptfs_printk(KERN_ERR,
+                                        "Error setting key; rc = [%d]\n",
+                                        rc);
+                        mutex_unlock(&crypt_stat->cs_tfm_mutex);
+                        rc = -EINVAL;
+                        goto out;
+                }
+                crypt_stat->flags |= ECRYPTFS_KEY_SET;
+        }
         mutex_unlock(&crypt_stat->cs_tfm_mutex);
-        if (rc) {
-                ecryptfs_printk(KERN_ERR, "Error decrypting; rc = [%d]\n",
-                                rc);
-                goto out;
+        ecryptfs_printk(KERN_DEBUG, "Decrypting [%d] bytes.\n", size);
+        ablkcipher_request_set_crypt(req, src_sg, dest_sg, size, iv);
+        rc = crypto_ablkcipher_decrypt(req);
+        if (rc == -EINPROGRESS || rc == -EBUSY) {
+                struct extent_crypt_result *ecr = req->base.data;
+
+                wait_for_completion(&ecr->completion);
+                rc = ecr->rc;
+                INIT_COMPLETION(ecr->completion);
         }
-        rc = size;
 out:
+        ablkcipher_request_free(req);
         return rc;
+
 }
 
 /**
@@ -746,8 +808,7 @@ int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat)
                                                     crypt_stat->cipher, "cbc");
         if (rc)
                 goto out_unlock;
-        crypt_stat->tfm = crypto_alloc_blkcipher(full_alg_name, 0,
-                                                 CRYPTO_ALG_ASYNC);
+        crypt_stat->tfm = crypto_alloc_ablkcipher(full_alg_name, 0, 0);
         kfree(full_alg_name);
         if (IS_ERR(crypt_stat->tfm)) {
                 rc = PTR_ERR(crypt_stat->tfm);
@@ -757,7 +818,7 @@ int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat)
                                 crypt_stat->cipher);
                 goto out_unlock;
         }
-        crypto_blkcipher_set_flags(crypt_stat->tfm, CRYPTO_TFM_REQ_WEAK_KEY);
+        crypto_ablkcipher_set_flags(crypt_stat->tfm, CRYPTO_TFM_REQ_WEAK_KEY);
         rc = 0;
 out_unlock:
         mutex_unlock(&crypt_stat->cs_tfm_mutex);
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index dd299b389d4e..f622a733f7ad 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -38,6 +38,7 @@
 #include <linux/nsproxy.h>
 #include <linux/backing-dev.h>
 #include <linux/ecryptfs.h>
+#include <linux/crypto.h>
 
 #define ECRYPTFS_DEFAULT_IV_BYTES 16
 #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096
@@ -233,7 +234,7 @@ struct ecryptfs_crypt_stat {
         size_t extent_shift;
         unsigned int extent_mask;
         struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
-        struct crypto_blkcipher *tfm;
+        struct crypto_ablkcipher *tfm;
         struct crypto_hash *hash_tfm; /* Crypto context for generating
                                        * the initialization vectors */
         unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE];