eCryptfs: kmem_cache objects for multiple keys; init/exit functions

Introduce kmem_cache objects for handling multiple keys per inode.  Add calls
in the module init and exit code to call the key list
initialization/destruction functions.

Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 36 insertions, 8 deletions

diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index 6e2170c96c02..0387f0d73cd0 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -240,14 +240,11 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options)
         int cipher_name_set = 0;
         int cipher_key_bytes;
         int cipher_key_bytes_set = 0;
-        struct key *auth_tok_key = NULL;
-        struct ecryptfs_auth_tok *auth_tok = NULL;
         struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
                 &ecryptfs_superblock_to_private(sb)->mount_crypt_stat;
         substring_t args[MAX_OPT_ARGS];
         int token;
         char *sig_src;
-        char *sig_dst;
         char *debug_src;
         char *cipher_name_dst;
         char *cipher_name_src;
@@ -258,6 +255,7 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options)
                 rc = -EINVAL;
                 goto out;
         }
+        ecryptfs_init_mount_crypt_stat(mount_crypt_stat);
         while ((p = strsep(&options, ",")) != NULL) {
                 if (!*p)
                         continue;
@@ -334,12 +332,10 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options)
                                         p);
                 }
         }
-        /* Do not support lack of mount-wide signature in 0.1
-         * release */
         if (!sig_set) {
                 rc = -EINVAL;
-                ecryptfs_printk(KERN_ERR, "You must supply a valid "
-                                "passphrase auth tok signature as a mount "
+                ecryptfs_printk(KERN_ERR, "You must supply at least one valid "
+                                "auth tok signature as a mount "
                                 "parameter; see the eCryptfs README\n");
                 goto out;
         }
@@ -615,6 +611,21 @@ static struct ecryptfs_cache_info {
                 .name = "ecryptfs_key_record_cache",
                 .size = sizeof(struct ecryptfs_key_record),
         },
+        {
+                .cache = &ecryptfs_key_sig_cache,
+                .name = "ecryptfs_key_sig_cache",
+                .size = sizeof(struct ecryptfs_key_sig),
+        },
+        {
+                .cache = &ecryptfs_global_auth_tok_cache,
+                .name = "ecryptfs_global_auth_tok_cache",
+                .size = sizeof(struct ecryptfs_global_auth_tok),
+        },
+        {
+                .cache = &ecryptfs_key_tfm_cache,
+                .name = "ecryptfs_key_tfm_cache",
+                .size = sizeof(struct ecryptfs_key_tfm),
+        },
 };
 
 static void ecryptfs_free_kmem_caches(void)
@@ -717,7 +728,8 @@ static struct ecryptfs_version_str_map_elem {
         {ECRYPTFS_VERSIONING_PUBKEY, "pubkey"},
         {ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH, "plaintext passthrough"},
         {ECRYPTFS_VERSIONING_POLICY, "policy"},
-        {ECRYPTFS_VERSIONING_XATTR, "metadata in extended attribute"}
+        {ECRYPTFS_VERSIONING_XATTR, "metadata in extended attribute"},
+        {ECRYPTFS_VERSIONING_MULTKEY, "multiple keys per file"}
 };
 
 static ssize_t version_str_show(struct ecryptfs_obj *obj, char *buff)
@@ -782,6 +794,12 @@ out:
 
 static void do_sysfs_unregistration(void)
 {
+        int rc;
+
+        if ((rc = ecryptfs_destruct_crypto())) {
+                printk(KERN_ERR "Failure whilst attempting to destruct crypto; "
+                       "rc = [%d]\n", rc);
+        }
         sysfs_remove_file(&ecryptfs_subsys.kobj,
                           &sysfs_attr_version.attr);
         sysfs_remove_file(&ecryptfs_subsys.kobj,
@@ -830,6 +848,16 @@ static int __init ecryptfs_init(void)
                 do_sysfs_unregistration();
                 unregister_filesystem(&ecryptfs_fs_type);
                 ecryptfs_free_kmem_caches();
+                goto out;
+        }
+        rc = ecryptfs_init_crypto();
+        if (rc) {
+                printk(KERN_ERR "Failure whilst attempting to init crypto; "
+                       "rc = [%d]\n", rc);
+                do_sysfs_unregistration();
+                unregister_filesystem(&ecryptfs_fs_type);
+                ecryptfs_free_kmem_caches();
+                goto out;
         }
 out:
         return rc;