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. */
+ * storage backends and in other places. This may also refer to read-only
+ * mmaped data. */
typedef struct {
gint refcount;
+ const char *addr;
+ size_t len;
+} BlueSkyMmap;
+
+typedef struct {
+ gint refcount;
+ BlueSkyMmap *mmap;
gchar *data;
gsize len;
} BlueSkyRCStr;
BlueSkyRCStr *bluesky_string_new(gpointer data, gsize len);
BlueSkyRCStr *bluesky_string_new_from_gstring(GString *s);
+BlueSkyRCStr *bluesky_string_new_from_mmap(BlueSkyMmap *mmap,
+ int offset, gsize len);
void bluesky_string_ref(BlueSkyRCStr *string);
void bluesky_string_unref(BlueSkyRCStr *string);
BlueSkyRCStr *bluesky_string_dup(BlueSkyRCStr *string);
struct _BlueSkyLog;
typedef struct _BlueSkyLog BlueSkyLog;
+struct _BlueSkyCloudLogState;
+typedef struct _BlueSkyCloudLogState BlueSkyCloudLogState;
+
+struct _BlueSkyCloudLog;
+typedef struct _BlueSkyCloudLog BlueSkyCloudLog;
+
void bluesky_store_init();
BlueSkyStore *bluesky_store_new(const gchar *type);
void bluesky_store_free(BlueSkyStore *store);
BlueSkyStore *store;
BlueSkyLog *log;
+ BlueSkyCloudLogState *log_state;
/* Accounting for memory used for caches. Space is measured in blocks, not
* bytes. We track both total data in the caches and dirty data (total
* avoid deadlock do not attempt to take any other locks while the FS lock
* is held for list editing purposes. Items at the head of the list are
* most recently accessed/modified. */
- GList dirty_list, accessed_list;
+ GList unlogged_list; // Changes not yet synced to journal
+ GList dirty_list; // Not yet written to cloud storage
+ GList accessed_list; // All in-memory inodes
/* Mutex for the flush daemon, to prevent concurrent execution. */
GMutex *flushd_lock;
+
+ /* Mapping of object identifiers (blocks, inodes) to physical location (in
+ * the local cache or in the logs in the cloud). */
+ GHashTable *locations;
} BlueSkyFS;
/* Inode number of the root directory. */
/* Additional state for tracking cache writeback status. */
uint64_t change_pending; /* change_count version currently being committed to storage */
+ /* Version of the object last serialized and committed to storage. */
+ BlueSkyCloudLog *committed_item;
+
/* Pointers to the linked-list elements for this inode in the accessed and
* dirty linked lists. We re-use the GList structure, using ->next to
* point to the head of the list and ->prev to point to the tail. The data
* element is unused. */
- GList *accessed_list, *dirty_list;
+ GList *unlogged_list, *accessed_list, *dirty_list;
int64_t atime; /* Microseconds since the Unix epoch */
int64_t ctime;
typedef struct {
BlueSkyBlockType type;
- gchar *ref; /* Name of data block in the backing store */
BlueSkyRCStr *data; /* Pointer to data in memory if cached */
+ BlueSkyCloudLog *cloudref; /* Reference to cloud log entry with data */
} BlueSkyBlock;
BlueSkyFS *bluesky_init_fs(gchar *name, BlueSkyStore *store);
void bluesky_file_read(BlueSkyInode *inode, uint64_t offset,
char *buf, gint len);
-void bluesky_inode_flush(BlueSkyFS *fs, BlueSkyInode *inode);
void bluesky_inode_fetch(BlueSkyFS *fs, uint64_t inum);
gint bluesky_dirent_compare(gconstpointer a, gconstpointer b,