* persistent storage. */
void bluesky_serialize_superblock(GString *out, BlueSkyFS *fs);
BlueSkyFS *bluesky_deserialize_superblock(const gchar *buf);
-void bluesky_serialize_inode(GString *out, BlueSkyInode *inode);
+BlueSkyCloudLog *bluesky_serialize_inode(BlueSkyInode *inode);
gboolean bluesky_deserialize_inode(BlueSkyInode *inode, const gchar *buf);
/* Storage layer. Requests can be performed asynchronously, so these objects
void bluesky_inode_start_sync(BlueSkyInode *inode);
void bluesky_block_touch(BlueSkyInode *inode, uint64_t i);
-void bluesky_block_fetch(BlueSkyFS *fs, BlueSkyBlock *block,
+void bluesky_block_fetch(BlueSkyInode *inode, BlueSkyBlock *block,
BlueSkyStoreAsync *barrier);
-void bluesky_block_flush(BlueSkyFS *fs, BlueSkyBlock *block,
+void bluesky_block_flush(BlueSkyInode *inode, BlueSkyBlock *block,
GList **log_items);
void bluesky_file_flush(BlueSkyInode *inode, GList **log_items);
void bluesky_file_drop_cached(BlueSkyInode *inode);
} BlueSkyCloudPointer;
typedef enum {
+ LOGTYPE_INVALID = -1,
LOGTYPE_UNKNOWN = 0,
LOGTYPE_DATA = 1,
LOGTYPE_INODE = 2,
#define CLOUDLOG_JOURNAL 0x01
#define CLOUDLOG_CLOUD 0x02
#define CLOUDLOG_CACHE 0x04
-typedef struct {
+struct _BlueSkyCloudLog {
gint refcount;
GMutex *lock;
GCond *cond;
// TODO: Location in journal/cache
int log_seq, log_offset, log_size;
- // Pointers to other objects
- GArray *pointers;
+ // Pointers to other objects. Each link counts towards the reference count
+ // of the pointed-to object. To avoid memory leaks there should be no
+ // cycles in the reference graph.
+ GArray *links;
- // Serialized data, if available in memory (otherwise NULL).
+ // Serialized data, if available in memory (otherwise NULL), and a lock
+ // count which tracks if there are users that require the data to be kept
+ // around.
BlueSkyRCStr *data;
-} BlueSkyCloudLog;
+ int data_lock_count;
+};
/* Serialize objects into a log segment to be written to the cloud. */
struct _BlueSkyCloudLogState {
void bluesky_cloudlog_unref(BlueSkyCloudLog *log);
void bluesky_cloudlog_sync(BlueSkyCloudLog *log);
void bluesky_cloudlog_insert(BlueSkyCloudLog *log);
-void bluesky_cloudlog_write_log(BlueSkyFS *fs);
+void bluesky_cloudlog_fetch(BlueSkyCloudLog *log);
+BlueSkyCloudPointer bluesky_cloudlog_serialize(BlueSkyCloudLog *log,
+ BlueSkyFS *fs);
+void bluesky_cloudlog_flush(BlueSkyFS *fs);
/* Logging infrastructure for ensuring operations are persistently recorded to
* disk. */
struct _BlueSkyLog {
char *log_directory;
GAsyncQueue *queue;
- int fd;
+ int fd, dirfd;
int seq_num;
+ GSList *committed;
+
+ /* Cache of log segments which have been memory-mapped. */
+ GMutex *mmap_lock;
+ GHashTable *mmap_cache;
+};
+
+/* Reference-counted blocks of memory, used for passing data in and out of
+ * storage backends and in other places. This may also refer to read-only
+ * mmaped data. */
+struct _BlueSkyMmap {
+ gint refcount;
+ int log_seq;
+ const char *addr;
+ size_t len;
+ BlueSkyLog *log;
};
BlueSkyLog *bluesky_log_new(const char *log_directory);
void bluesky_log_item_submit(BlueSkyCloudLog *item, BlueSkyLog *log);
void bluesky_log_finish_all(GList *log_items);
+BlueSkyRCStr *bluesky_log_map_object(BlueSkyLog *log, int log_seq,
+ int log_offset, int log_size);
+void bluesky_mmap_unref(BlueSkyMmap *mmap);
#ifdef __cplusplus
}