gchar *bluesky_lowercase(const gchar *s);
-struct _BlueSkyMmap;
-typedef struct _BlueSkyMmap BlueSkyMmap;
+struct _BlueSkyCacheFile;
+typedef struct _BlueSkyCacheFile BlueSkyCacheFile;
typedef struct {
gint refcount;
- BlueSkyMmap *mmap;
+ BlueSkyCacheFile *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,
+BlueSkyRCStr *bluesky_string_new_from_mmap(BlueSkyCacheFile *mmap,
int offset, gsize len);
void bluesky_string_ref(BlueSkyRCStr *string);
void bluesky_string_unref(BlueSkyRCStr *string);
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
- * data includes dirty data). Updates to these variables must be made
- * atomically. */
- gint cache_total, cache_dirty;
+ * bytes. Updates to these variables must be made atomically. */
+ gint cache_dirty;
+
+ /* Like above, but tracking data stored in the cloudlog entries
+ * specifically:
+ * - cache_log_dirty: data uncommitted to journal and cloud
+ * - cache_log_writeback: data being written to journal
+ * - cache_log_journal: data committed to journal
+ * - cache_log_cloud: data written to cloud as well
+ * Log entries should progress from the top state to the bottom, and are
+ * only ever counted in one category at a time. */
+ gint cache_log_dirty, cache_log_writeback,
+ cache_log_journal, cache_log_cloud;
/* Linked list of inodes, sorted by access/modification times for cache
* management. Editing these lists is protected by the filesystem lock; to
/* Mutex for the flush daemon, to prevent concurrent execution. */
GMutex *flushd_lock;
+ /* Used to wait for the cache daemon to free up space */
+ GCond *flushd_cond;
+
/* Mapping of object identifiers (blocks, inodes) to physical location (in
* the local cache or in the logs in the cloud). */
GHashTable *locations;
#define BLUESKY_MAX_FILE_SIZE (BLUESKY_BLOCK_SIZE << 24)
typedef enum {
BLUESKY_BLOCK_ZERO = 0, /* Data is all zeroes, not explicitly stored */
- BLUESKY_BLOCK_REF = 1, /* Reference to key/value store, not cached */
- BLUESKY_BLOCK_CACHED = 2, /* Data is cached in memory, clean */
- BLUESKY_BLOCK_DIRTY = 3, /* Data needs to be committed to store */
+ BLUESKY_BLOCK_REF = 1, /* Reference to cloud log item, data clean */
+ BLUESKY_BLOCK_DIRTY = 2, /* Data needs to be committed to store */
} BlueSkyBlockType;
typedef struct {
BlueSkyBlockType type;
- BlueSkyRCStr *data; /* Pointer to data in memory if cached */
- BlueSkyCloudLog *cloudref; /* Reference to cloud log entry with data */
+ BlueSkyCloudLog *ref; /* if REF: cloud log entry with data */
+ BlueSkyRCStr *dirty; /* if DIRTY: raw data in memory */
} BlueSkyBlock;
BlueSkyFS *bluesky_init_fs(gchar *name, BlueSkyStore *store);