+ char *logname;
+
+ // A request for a local log file
+ if (clouddir < 0) {
+ logname = g_strdup_printf("log-%08d", log_seq);
+ } else {
+ logname = g_strdup_printf("log-%08d-%08d", clouddir, log_seq);
+ }
+
+ /* TODO: stat() call */
+ map = g_new0(BlueSkyCacheFile, 1);
+ map->type = CLOUDLOG_JOURNAL;
+ map->lock = g_mutex_new();
+ g_mutex_lock(map->lock);
+ map->cond = g_cond_new();
+ map->filename = logname;
+ map->log_seq = log_seq;
+ map->log = log;
+ g_atomic_int_set(&map->refcount, 0);
+
+ g_hash_table_insert(log->mmap_cache, GINT_TO_POINTER(log_seq), map);
+
+ // If the log file is stored in the cloud, we may need to fetch it
+ if (clouddir >= 0) {
+ map->fetching = TRUE;
+ g_print("Starting fetch of %s from cloud\n", logname);
+ BlueSkyStoreAsync *async = bluesky_store_async_new(fs->store);
+ async->op = STORE_OP_GET;
+ async->key = g_strdup(logname);
+ bluesky_store_async_add_notifier(async,
+ (GFunc)cloudlog_fetch_complete,
+ map);
+ bluesky_store_async_submit(async);
+ bluesky_store_async_unref(async);
+ }
+ } else {
+ g_mutex_lock(map->lock);
+ }
+
+ g_mutex_unlock(log->mmap_lock);
+ return map;
+}
+
+BlueSkyRCStr *bluesky_log_map_object(BlueSkyFS *fs, int log_dir,
+ int log_seq, int log_offset, int log_size)
+{
+ if (page_size == 0) {
+ page_size = getpagesize();
+ }
+
+ BlueSkyLog *log = fs->log;
+ BlueSkyCacheFile *map = bluesky_cachefile_lookup(fs, log_dir, log_seq);
+
+ if (map == NULL) {
+ return NULL;
+ }
+
+ if (map->addr == NULL) {
+ while (!map->ready && map->fetching) {
+ g_print("Waiting for log segment to be fetched from cloud...\n");
+ g_cond_wait(map->cond, map->lock);
+ }
+
+ int fd = openat(log->dirfd, map->filename, O_RDONLY);