void bluesky_cloudlog_ref(BlueSkyCloudLog *log)
{
+ if (log == NULL)
+ return;
+
g_atomic_int_inc(&log->refcount);
}
void bluesky_cloudlog_unref(BlueSkyCloudLog *log)
{
+ if (log == NULL)
+ return;
+
if (g_atomic_int_dec_and_test(&log->refcount)) {
g_print("Cloud log refcount dropped to zero.\n");
}
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_ref(log2);
+ g_mutex_unlock(log->fs->lock);
bluesky_cloudlog_serialize(log2, state);
+ bluesky_cloudlog_unref(log2);
}
+ g_mutex_lock(log->lock);
+ bluesky_cloudlog_fetch(log);
g_assert(log->data != NULL);
log->location = state->location;
g_string_append_len(state->data, log->data->data, log->data->len);
log->location_flags |= CLOUDLOG_CLOUD;
+ g_mutex_unlock(log->lock);
return log->location;
}
void bluesky_cloudlog_write_log(BlueSkyFS *fs)
{
- g_print("Starting cloudlog write...\n");
-
BlueSkyCloudLogState *state = fs->log_state;
- state->data = g_string_new("");
+ if (state->data == NULL)
+ state->data = g_string_new("");
g_mutex_lock(fs->lock);
g_hash_table_foreach(fs->locations, find_inodes, state);
state->inode_list);
}
- g_print("Serialized %zd bytes of data\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);
+ 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;
- state->location.sequence++;
- state->location.offset = 0;
+}
+
+/* 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);
}