return;
}
- g_hash_table_remove(fs->locations, &log->id);
+ if (!g_hash_table_remove(fs->locations, &log->id)) {
+ if (bluesky_verbose)
+ g_warning("Could not find and remove cloud log item from hash table!");
+ }
g_mutex_unlock(fs->lock);
bluesky_cloudlog_stats_update(log, -1);
}
}
+/* For locking reasons cloudlog unrefs may sometimes need to be performed in
+ * the future. We launch a thread for handling these delayed unreference
+ * requests. */
+static gpointer cloudlog_unref_thread(gpointer q)
+{
+ GAsyncQueue *queue = (GAsyncQueue *)q;
+
+ while (TRUE) {
+ BlueSkyCloudLog *item = (BlueSkyCloudLog *)g_async_queue_pop(queue);
+ bluesky_cloudlog_unref(item);
+ }
+
+ return NULL;
+}
+
+void bluesky_cloudlog_unref_delayed(BlueSkyCloudLog *log)
+{
+ if (log != NULL)
+ g_async_queue_push(log->fs->unref_queue, log);
+}
+
+void bluesky_cloudlog_threads_init(BlueSkyFS *fs)
+{
+ fs->unref_queue = g_async_queue_new();
+ g_thread_create(cloudlog_unref_thread, fs->unref_queue, FALSE, NULL);
+}
+
+/* Erase the information contained within the in-memory cloud log
+ * representation. This does not free up the item itself, but frees the data
+ * and references to other log items and resets the type back to unknown. If
+ * the object was written out to persistent storage, all state about it can be
+ * recovered by loading the object back in. The object must be locked before
+ * calling this function. */
+void bluesky_cloudlog_erase(BlueSkyCloudLog *log)
+{
+ g_assert(log->data_lock_count == 0);
+
+ if (log->type == LOGTYPE_UNKNOWN)
+ return;
+
+ log->type = LOGTYPE_UNKNOWN;
+ log->data_size = 0;
+ bluesky_string_unref(log->data);
+ log->data = NULL;
+ log->data_lock_count = 0;
+
+ for (int i = 0; i < log->links->len; i++) {
+ BlueSkyCloudLog *c = g_array_index(log->links,
+ BlueSkyCloudLog *, i);
+ bluesky_cloudlog_unref(c);
+ }
+ g_array_unref(log->links);
+ log->links = g_array_new(FALSE, TRUE, sizeof(BlueSkyCloudLog *));
+}
+
/* Start a write of the object to the local log. */
void bluesky_cloudlog_sync(BlueSkyCloudLog *log)
{
/* Add the given entry to the global hash table containing cloud log entries.
* Takes ownership of the caller's reference. */
+void bluesky_cloudlog_insert_locked(BlueSkyCloudLog *log)
+{
+ g_hash_table_insert(log->fs->locations, &log->id, log);
+}
+
void bluesky_cloudlog_insert(BlueSkyCloudLog *log)
{
g_mutex_lock(log->fs->lock);
- g_hash_table_insert(log->fs->locations, &log->id, log);
+ bluesky_cloudlog_insert_locked(log);
g_mutex_unlock(log->fs->lock);
}
item = g_hash_table_lookup(fs->locations, &id);
if (item == NULL) {
item = bluesky_cloudlog_new(fs, &id);
- g_hash_table_insert(fs->locations, &id, item);
+ bluesky_cloudlog_insert_locked(item);
} else {
bluesky_cloudlog_ref(item);
}
if (log->data != NULL)
return;
- int offset;
+ /* There are actually two cases: a full deserialization if we have not ever
+ * read the object before, and a partial deserialization where the metadata
+ * is already in memory and we just need to remap the data. If the object
+ * type has not yet been set, we'll need to read and parse the metadata.
+ * Once that is done, we can fall through the case of remapping the data
+ * itself. */
+ if (log->type == LOGTYPE_UNKNOWN) {
+ BlueSkyRCStr *raw = NULL;
+ if ((log->location_flags | log->pending_write) & CLOUDLOG_JOURNAL) {
+ raw = bluesky_log_map_object(log->fs, -1, log->log_seq,
+ log->log_offset, log->log_size);
+ }
+ if (raw == NULL && (log->location_flags & CLOUDLOG_CLOUD)) {
+ log->location_flags &= ~CLOUDLOG_JOURNAL;
+ raw = bluesky_log_map_object(log->fs,
+ log->location.directory,
+ log->location.sequence,
+ log->location.offset,
+ log->location.size);
+ }
+
+ g_assert(raw != NULL);
+ bluesky_deserialize_cloudlog(log, raw->data, raw->len);
+ bluesky_string_unref(raw);
+ }
+
+ /* At this point all metadata should be available and we need only remap
+ * the object data. */
+
+ int offset;
if ((log->location_flags | log->pending_write) & CLOUDLOG_JOURNAL) {
bluesky_cloudlog_stats_update(log, -1);
offset = log->log_offset + sizeof(struct log_header);
GString *data3 = g_string_new("");
bluesky_serialize_cloudlog(log, data1, data2, data3);
- /* TODO: Right now offset/size are set to the raw data, but we should add
- * header parsing to the code which loads objects back in. */
log->location = state->location;
log->location.offset = state->data->len;
log->data_size = data1->len;
struct cloudlog_header header;
memcpy(header.magic, CLOUDLOG_MAGIC, 4);
+ memset(header.crypt_auth, sizeof(header.crypt_auth), 0);
+ memset(header.crypt_iv, sizeof(header.crypt_iv), 0);
header.type = log->type + '0';
header.size1 = GUINT32_TO_LE(data1->len);
header.size2 = GUINT32_TO_LE(data2->len);
header.size3 = GUINT32_TO_LE(data3->len);
header.id = log->id;
+ header.inum = GUINT64_TO_LE(log->inum);
g_string_append_len(state->data, (const char *)&header, sizeof(header));
g_string_append_len(state->data, data1->str, data1->len);
log->location.size = state->data->len - log->location.offset;
+ g_string_free(data1, TRUE);
+ g_string_free(data2, TRUE);
+ g_string_free(data3, TRUE);
+
/* If the object we flushed was an inode, update the inode map. */
if (log->type == LOGTYPE_INODE) {
g_mutex_lock(fs->lock);
InodeMapEntry *entry = bluesky_inode_map_lookup(fs->inode_map,
log->inum, 1);
- entry->id = log->id;
- entry->location = log->location;
+ entry->item = log;
+ bluesky_cloudlog_ref(entry->item);
g_mutex_unlock(fs->lock);
}
projects / bluesky.git / blobdiff