+
+struct log_header {
+ char magic[4];
+ uint32_t size;
+ BlueSkyCloudID id;
+ uint32_t pointer_count;
+} __attribute__((packed));
+
+struct logref {
+ BlueSkyCloudID id;
+ BlueSkyCloudPointer location;
+} __attribute__((packed));
+
+struct log_footer {
+ char refmagic[4];
+ struct logref refs[0];
+};
+
+BlueSkyCloudPointer bluesky_cloudlog_serialize(BlueSkyCloudLog *log,
+ BlueSkyCloudLogState *state)
+{
+ if (log->location_flags & CLOUDLOG_CLOUD) {
+ return log->location;
+ }
+
+ g_print("Flushing object %s to cloud...\n",
+ bluesky_cloudlog_id_to_string(log->id));
+
+ for (int i = 0; i < log->pointers->len; i++) {
+ BlueSkyCloudID id = g_array_index(log->pointers, BlueSkyCloudID, i);
+ g_print(" ...checking reference %s...\n",
+ bluesky_cloudlog_id_to_string(id));
+ g_mutex_lock(log->fs->lock);
+ BlueSkyCloudLog *log2
+ = (BlueSkyCloudLog *)g_hash_table_lookup(log->fs->locations, &id);
+ // TODO: refcount
+ g_mutex_unlock(log->fs->lock);
+ g_assert(log2 != NULL);
+ bluesky_cloudlog_serialize(log2, state);
+ }
+
+ g_assert(log->data != NULL);
+
+ log->location = state->location;
+ log->location.offset = state->data->len;
+ log->location.size
+ = sizeof(struct log_header) + sizeof(BlueSkyCloudID) * 0
+ + log->data->len;
+
+ struct log_header header;
+ memcpy(header.magic, "AgI ", 4);
+ header.size = GUINT32_TO_LE(log->location.size);
+ header.id = log->id;
+ header.pointer_count = GUINT32_TO_LE(0);
+
+ g_string_append_len(state->data, (const char *)&header, sizeof(header));
+ g_string_append_len(state->data, log->data->data, log->data->len);
+
+ log->location_flags |= CLOUDLOG_CLOUD;
+
+ return log->location;
+}
+
+static void find_inodes(gpointer key, gpointer value, gpointer user_data)
+{
+ BlueSkyCloudLogState *state = (BlueSkyCloudLogState *)user_data;
+ BlueSkyCloudLog *item = (BlueSkyCloudLog *)value;
+
+ if (item->type != LOGTYPE_INODE)
+ return;
+
+ bluesky_cloudlog_ref(item);
+ state->inode_list = g_list_prepend(state->inode_list, item);
+}
+
+void bluesky_cloudlog_write_log(BlueSkyFS *fs)
+{
+ BlueSkyCloudLogState *state = fs->log_state;
+ if (state->data == NULL)
+ state->data = g_string_new("");
+
+ g_mutex_lock(fs->lock);
+ g_hash_table_foreach(fs->locations, find_inodes, state);
+ g_mutex_unlock(fs->lock);
+
+ while (state->inode_list != NULL) {
+ BlueSkyCloudLog *log = (BlueSkyCloudLog *)state->inode_list->data;
+ bluesky_cloudlog_serialize(log, state);
+ state->inode_list = g_list_delete_link(state->inode_list,
+ state->inode_list);
+ }
+
+ if (state->data->len > 0) {
+ g_print("Serialized %zd bytes of data to cloud\n", state->data->len);
+
+ BlueSkyStoreAsync *async = bluesky_store_async_new(fs->store);
+ async->op = STORE_OP_PUT;
+ async->key = g_strdup_printf("log-%08d-%08d",
+ state->location.directory,
+ state->location.sequence);
+ async->data = bluesky_string_new_from_gstring(state->data);
+ bluesky_store_async_submit(async);
+ bluesky_store_async_wait(async);
+ bluesky_store_async_unref(async);
+
+ state->location.sequence++;
+ state->location.offset = 0;
+ }
+
+ state->data = NULL;
+}
+
+/* Ensure that a cloud log item is loaded in memory, and if not read it in.
+ * TODO: Make asynchronous, and make this also fetch from the cloud. Right now
+ * we only read from the log. Log item must be locked. */
+void bluesky_cloudlog_fetch(BlueSkyCloudLog *log)
+{
+ if (log->data != NULL)
+ return;
+
+ g_print("Re-mapping log entry %d/%d/%d...\n",
+ log->log_seq, log->log_offset, log->log_size);
+
+ g_assert(log->location_flags & CLOUDLOG_JOURNAL);
+
+ log->data = bluesky_log_map_object(log->fs->log, log->log_seq,
+ log->log_offset, log->log_size);
+
+ g_cond_broadcast(log->cond);
+}