The patch titled
eCryptfs: load each file decryption key only once
has been added to the -mm tree. Its filename is
ecryptfs-load-each-file-decryption-key-only-once.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: eCryptfs: load each file decryption key only once
From: Trevor Highland <thighlan@xxxxxxxxx>
There is no need to keep re-setting the same key for any given eCryptfs inode.
This patch optimizes the use of the crypto API and helps performance a bit.
Signed-off-by: Trevor Highland <trevor.highland@xxxxxxxxx>
Cc: Michael Halcrow <mhalcrow@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ecryptfs/crypto.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff -puN fs/ecryptfs/crypto.c~ecryptfs-load-each-file-decryption-key-only-once fs/ecryptfs/crypto.c
--- a/fs/ecryptfs/crypto.c~ecryptfs-load-each-file-decryption-key-only-once
+++ a/fs/ecryptfs/crypto.c
@@ -353,7 +353,6 @@ static int encrypt_scatterlist(struct ec
ecryptfs_dump_hex(crypt_stat->key,
crypt_stat->key_size);
}
- /* Consider doing this once, when the file is opened */
mutex_lock(&crypt_stat->cs_tfm_mutex);
if (!(crypt_stat->flags & ECRYPTFS_KEY_SET)) {
rc = crypto_blkcipher_setkey(crypt_stat->tfm, crypt_stat->key,
@@ -687,10 +686,12 @@ static int decrypt_scatterlist(struct ec
};
int rc = 0;
- /* Consider doing this once, when the file is opened */
mutex_lock(&crypt_stat->cs_tfm_mutex);
- rc = crypto_blkcipher_setkey(crypt_stat->tfm, crypt_stat->key,
- crypt_stat->key_size);
+ 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);
_
Patches currently in -mm which might be from thighlan@xxxxxxxxx are
ecryptfs-change-the-type-of-cipher_code-from-u16-to-u8.patch
ecryptfs-load-each-file-decryption-key-only-once.patch
-
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