extern "C" {
#endif
+/* Various options to tweak for performance benchmarking purposes. */
+typedef struct {
+ /* Perform all get/put operations synchronously. */
+ int synchronous_stores;
+
+ /* Write data in cache immediately after file is modified. */
+ int writethrough_cache;
+
+ /* Can inodes be fetched asynchronously? (Inode object is initially
+ * created in a pending state, and not unlocked until the data is actually
+ * available.) */
+ int sync_inode_fetches;
+} BlueSkyOptions;
+
+extern BlueSkyOptions bluesky_options;
+
+/* BlueSky status and error codes. Various frontends should translate these to
+ * the appropriate error code for whatever protocol they implement. */
+typedef enum {
+ BSTATUS_OK = 0, /* No error */
+ BSTATUS_IOERR, /* I/O error of some form */
+ BSTATUS_NOENT, /* File does not exist */
+} BlueSkyStatus;
+
void bluesky_init(void);
gchar *bluesky_lowercase(const gchar *s);
} BlueSkyRCStr;
BlueSkyRCStr *bluesky_string_new(gpointer data, gsize len);
+BlueSkyRCStr *bluesky_string_new_from_gstring(GString *s);
void bluesky_string_ref(BlueSkyRCStr *string);
void bluesky_string_unref(BlueSkyRCStr *string);
BlueSkyRCStr *bluesky_string_dup(BlueSkyRCStr *string);
+void bluesky_string_resize(BlueSkyRCStr *string, gsize len);
/* Cryptographic operations. */
#define CRYPTO_BLOCK_SIZE 16 /* 128-bit AES */
#define CRYPTO_KEY_SIZE 16
void bluesky_crypt_init();
+void bluesky_crypt_hash_key(const char *keystr, uint8_t *out);
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;
BLUESKY_SYMLINK = 5,
BLUESKY_SOCKET = 6,
BLUESKY_FIFO = 7,
+
+ /* Special types used only internally. */
+ BLUESKY_PENDING = 0, /* Inode being loaded; type not yet determined */
+ BLUESKY_INVALID = -1, /* Inode is invalid (failed to load) */
} BlueSkyFileType;
/* Filesystem state. Each filesystem which is exported is represented by a
uint64_t next_inum; /* Next available inode for allocation */
BlueSkyStore *store;
-
- uint8_t *encryption_key;
} BlueSkyFS;
/* Inode number of the root directory. */
* dropping from the cache.
* - Any pending operations should hold extra references to the inode as
* appropriate to keep it available until the operation completes.
+ * - Locking dependency order is, when multiple locks are to be acquired, to
+ * acquire locks on parents in the filesystem tree before children.
+ * (TODO: What about rename when we acquire locks in unrelated parts of the
+ * filesystem?)
* */
typedef struct {
GMutex *lock;
* committed to stable storage. */
uint64_t change_count, change_commit;
+ /* Timestamp for controlling when modified data is flushed to stable
+ * storage. When an inode is first modified from a clean state, this is
+ * set to the current time. If the inode is clean, it is set to zero. */
+ int64_t change_time;
+
+ /* Additional state for tracking cache writeback status. */
+ uint64_t change_pending; /* change_count version currently being committed to storage */
+
int64_t atime; /* Microseconds since the Unix epoch */
int64_t ctime;
int64_t mtime;
GHashTable *dirhash; /* Hash table by name for LOOKUP */
GHashTable *dirhash_folded; /* As above, but case-folded */
uint64_t parent_inum; /* inode for ".."; 0 if the root directory */
+
+ /* Symlink-specific fields */
+ gchar *symlink_contents;
} BlueSkyInode;
/* A directory entry. The name is UTF-8 and is a freshly-allocated string.
int64_t bluesky_get_current_time();
void bluesky_inode_update_ctime(BlueSkyInode *inode, gboolean update_mtime);
uint64_t bluesky_fs_alloc_inode(BlueSkyFS *fs);
+void bluesky_init_inode(BlueSkyInode *i, BlueSkyFileType type);
BlueSkyInode *bluesky_new_inode(uint64_t inum, BlueSkyFS *fs, BlueSkyFileType type);
BlueSkyInode *bluesky_get_inode(BlueSkyFS *fs, uint64_t inum);
+void bluesky_inode_ref(BlueSkyInode *inode);
+void bluesky_inode_unref(BlueSkyInode *inode);
void bluesky_insert_inode(BlueSkyFS *fs, BlueSkyInode *inode);
void bluesky_dirent_destroy(gpointer dirent);
uint64_t bluesky_directory_lookup(BlueSkyInode *inode, gchar *name);
uint64_t bluesky_directory_ilookup(BlueSkyInode *inode, gchar *name);
+BlueSkyDirent *bluesky_directory_read(BlueSkyInode *dir, uint32_t cookie);
gboolean bluesky_directory_insert(BlueSkyInode *dir, const gchar *name,
uint64_t inum);
void bluesky_directory_dump(BlueSkyInode *dir);
void bluesky_block_touch(BlueSkyInode *inode, uint64_t i);
void bluesky_block_fetch(BlueSkyFS *fs, BlueSkyBlock *block);
-void bluesky_block_flush(BlueSkyFS *fs, BlueSkyBlock *block);
void bluesky_file_truncate(BlueSkyInode *inode, uint64_t size);
void bluesky_file_write(BlueSkyInode *inode, uint64_t offset,
const char *data, gint len);
gint bluesky_dirent_compare(gconstpointer a, gconstpointer b,
gpointer unused);
+void bluesky_flushd_invoke(BlueSkyFS *fs);
+void bluesky_inode_do_sync(BlueSkyInode *inode);
+
+void bluesky_debug_dump(BlueSkyFS *fs);
+
#ifdef __cplusplus
}
#endif
projects / bluesky.git / blobdiff