GString *data;
BlueSkyCloudPointer location;
GList *inode_list;
+ GSList *writeback_list; // Items which are being serialized right now
+ GList *pending_segments; // Segments which are being uploaded now
};
gboolean bluesky_cloudlog_equal(gconstpointer a, gconstpointer b);
uint32_t crc32c_finalize(uint32_t crc);
struct _BlueSkyLog {
+ BlueSkyFS *fs;
char *log_directory;
GAsyncQueue *queue;
int fd, dirfd;
int seq_num;
GSList *committed;
+ /* The currently-open log file. */
+ BlueSkyCacheFile *current_log;
+
/* Cache of log segments which have been memory-mapped. */
GMutex *mmap_lock;
GHashTable *mmap_cache;
/* A count of the disk space consumed (in 1024-byte units) by all files
* tracked by mmap_cache (whether mapped or not, actually). */
gint disk_used;
+
+ /* The smallest journal sequence number which may still contain data that
+ * must be preserved (since it it not yet in the cloud). */
+ int journal_watermark;
};
/* An object for tracking log files which are stored locally--either the
size_t len;
BlueSkyFS *fs;
BlueSkyLog *log;
- gboolean fetching, ready;
+ gboolean fetching, ready; // Cloud data: downloading or ready for use
int64_t atime; // Access time, for cache management
};
BlueSkyRCStr *bluesky_log_map_object(BlueSkyFS *fs, int log_dir, int log_seq,
int log_offset, int log_size);
void bluesky_mmap_unref(BlueSkyCacheFile *mmap);
+void bluesky_cachefile_unref(BlueSkyCacheFile *cachefile);
+BlueSkyCacheFile *bluesky_cachefile_lookup(BlueSkyFS *fs,
+ int clouddir, int log_seq);
void bluesky_cachefile_gc(BlueSkyFS *fs);
+/* Used to track log segments that are being written to the cloud. */
+typedef struct {
+ BlueSkyRCStr *data;
+ GSList *items;
+ GMutex *lock;
+ GCond *cond;
+ gboolean complete;
+} SerializedRecord;
+
+/***** Inode map management *****/
+
+/* Mapping information for a single inode number. These are grouped together
+ * into InodeMapRange objects. */
+typedef struct {
+ uint64_t inum;
+
+ /* The ID of the most recent version of the inode. */
+ BlueSkyCloudID id;
+
+ /* The location where that version is written in the cloud. */
+ BlueSkyCloudPointer location;
+
+ /* If the cloud log entry exists in memory, then a pointer to it, otherwise
+ * NULL. */
+ BlueSkyCloudLog *item;
+} InodeMapEntry;
+
+typedef struct {
+ /* Starting and ending inode number values that fall in this section.
+ * Endpoint values are inclusive. */
+ uint64_t start, end;
+
+ /* A sorted list (by inode number) of InodeMapEntry objects. */
+ GSequence *map_entries;
+
+ /* The location where this inode map section is stored in the cloud. */
+ BlueSkyCloudPointer location;
+
+ /* Have there been changes that require writing this section out again? */
+ gboolean dirty;
+} InodeMapRange;
+
+InodeMapEntry *bluesky_inode_map_lookup(GSequence *inode_map, uint64_t inum,
+ int action);
+
#ifdef __cplusplus
}
#endif