X-Git-Url: http://git.vrable.net/?a=blobdiff_plain;f=bluesky%2Fbluesky.h;h=7419cd439daa2082fa6db0fca37db09b2fa590ee;hb=03476a3d39444ff2a09174e945ab645508c2224c;hp=856dd75a6244bce3b1bf22ba65a6f4cb01373abf;hpb=70fdd2326239a9a5e02b3c3699d2588d5fee48fa;p=bluesky.git

diff --git a/bluesky/bluesky.h b/bluesky/bluesky.h
index 856dd75..7419cd4 100644
--- a/bluesky/bluesky.h
+++ b/bluesky/bluesky.h
@@ -16,7 +16,9 @@
 extern "C" {
 #endif
 
-struct S3Store;
+void bluesky_init(void);
+
+gchar *bluesky_lowercase(const gchar *s);
 
 /* Reference-counted blocks of memory, used for passing data in and out of
  * storage backends and in other places. */
@@ -31,6 +33,44 @@ void bluesky_string_ref(BlueSkyRCStr *string);
 void bluesky_string_unref(BlueSkyRCStr *string);
 BlueSkyRCStr *bluesky_string_dup(BlueSkyRCStr *string);
 
+/* Cryptographic operations. */
+#define CRYPTO_BLOCK_SIZE 16        /* 128-bit AES */
+#define CRYPTO_KEY_SIZE   16
+
+void bluesky_crypt_init();
+void bluesky_crypt_random_bytes(guchar *buf, gint len);
+BlueSkyRCStr *bluesky_crypt_encrypt(BlueSkyRCStr *in, const uint8_t *key);
+BlueSkyRCStr *bluesky_crypt_decrypt(BlueSkyRCStr *in, const uint8_t *key);
+
+/* Storage interface.  This presents a key-value store abstraction, and can
+ * have multiple implementations: in-memory, on-disk, in-cloud. */
+typedef struct {
+    /* Create a new store instance and return a handle to it. */
+    gpointer (*create)();
+
+    /* Clean up any resources used by this store. */
+    void (*destroy)(gpointer store);
+
+    /* Fetch an item with the given name, or return NULL if not found. */
+    BlueSkyRCStr * (*get)(gpointer store, const gchar *key);
+
+    /* Store an item to the given key name. */
+    void (*put)(gpointer store, const gchar *key, BlueSkyRCStr *val);
+} BlueSkyStoreImplementation;
+
+void bluesky_store_register(const BlueSkyStoreImplementation *impl,
+                            const gchar *name);
+
+struct _BlueSkyStore;
+typedef struct _BlueSkyStore BlueSkyStore;
+
+void bluesky_store_init();
+BlueSkyStore *bluesky_store_new(const gchar *type);
+void bluesky_store_free(BlueSkyStore *store);
+BlueSkyRCStr *bluesky_store_get(BlueSkyStore *store, const gchar *key);
+void bluesky_store_put(BlueSkyStore *store,
+                       const gchar *key, BlueSkyRCStr *val);
+
 /* File types.  The numeric values are chosen to match with those used in
  * NFSv3. */
 typedef enum {
@@ -52,7 +92,9 @@ typedef struct {
     GHashTable *inodes;         /* Cached inodes */
     uint64_t next_inum;         /* Next available inode for allocation */
 
-    struct S3Store *store;
+    BlueSkyStore *store;
+
+    uint8_t *encryption_key;
 } BlueSkyFS;
 
 /* Inode number of the root directory. */
@@ -63,10 +105,18 @@ typedef int64_t bluesky_time;
 
 /* In-memory representation of an inode within a Blue Sky server.  This
  * corresponds roughly with information that is committed to persistent
- * storage. */
+ * storage.  Locking/refcounting rules:
+ *   - To access or modify any data fields, the lock must be held.  This
+ *     includes file blocks.
+ *   - One reference is held by the BlueSkyFS inode hash table.  If that is the
+ *     only reference (and the inode is unlocked), the inode is subject to
+ *     dropping from the cache.
+ *   - Any pending operations should hold extra references to the inode as
+ *     appropriate to keep it available until the operation completes.
+ * */
 typedef struct {
-    gint refcnt;                /* May be accessed atomically without lock */
     GMutex *lock;
+    gint refcount;
 
     BlueSkyFS *fs;
 
@@ -80,7 +130,12 @@ typedef struct {
      * that we don't exhaust the identifier space. */
     uint64_t inum;
 
-    uint64_t change_count;      /* Incremented each with each change made */
+    /* change_count is increased with every operation which modifies the inode,
+     * and can be used to determine if cached data is still valid.
+     * change_commit is the value of change_count when the inode was last
+     * committed to stable storage. */
+    uint64_t change_count, change_commit;
+
     int64_t atime;              /* Microseconds since the Unix epoch */
     int64_t ctime;
     int64_t mtime;
@@ -151,9 +206,13 @@ void bluesky_file_write(BlueSkyInode *inode, uint64_t offset,
 void bluesky_file_read(BlueSkyInode *inode, uint64_t offset,
                        char *buf, gint len);
 
-struct S3Store *s3store_new();
-BlueSkyRCStr *s3store_get(struct S3Store *store, const gchar *key);
-void s3store_put(struct S3Store *store, const gchar *key, BlueSkyRCStr *val);
+void bluesky_inode_flush(BlueSkyFS *fs, BlueSkyInode *inode);
+void bluesky_inode_fetch(BlueSkyFS *fs, uint64_t inum);
+void bluesky_serialize_inode(GString *out, BlueSkyInode *inode);
+BlueSkyInode *bluesky_deserialize_inode(BlueSkyFS *fs, const gchar *buf);
+
+gint bluesky_dirent_compare(gconstpointer a, gconstpointer b,
+                            gpointer unused);
 
 #ifdef __cplusplus
 }