ext4 crypto: use slab caches
Use slab caches the ext4_crypto_ctx and ext4_crypt_info structures for
slighly better memory efficiency and debuggability.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/fs/ext4/crypto_key.c b/fs/ext4/crypto_key.c
index 0075e43..d6abe46 100644
--- a/fs/ext4/crypto_key.c
+++ b/fs/ext4/crypto_key.c
@@ -96,7 +96,7 @@
key_put(ci->ci_keyring_key);
crypto_free_ablkcipher(ci->ci_ctfm);
memzero_explicit(&ci->ci_raw, sizeof(ci->ci_raw));
- kfree(ci);
+ kmem_cache_free(ext4_crypt_info_cachep, ci);
ei->i_crypt_info = NULL;
}
@@ -113,6 +113,12 @@
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
int res;
+ if (!ext4_read_workqueue) {
+ res = ext4_init_crypto();
+ if (res)
+ return res;
+ }
+
if (ei->i_crypt_info) {
if (!ei->i_crypt_info->ci_keyring_key ||
key_validate(ei->i_crypt_info->ci_keyring_key) == 0)
@@ -134,7 +140,7 @@
return -EINVAL;
res = 0;
- crypt_info = kmalloc(sizeof(struct ext4_crypt_info), GFP_KERNEL);
+ crypt_info = kmem_cache_alloc(ext4_crypt_info_cachep, GFP_KERNEL);
if (!crypt_info)
return -ENOMEM;
@@ -188,7 +194,7 @@
if (res < 0) {
if (res == -ENOKEY)
res = 0;
- kfree(crypt_info);
+ kmem_cache_free(ext4_crypt_info_cachep, crypt_info);
} else {
ei->i_crypt_info = crypt_info;
crypt_info->ci_keyring_key = keyring_key;