}
}
+/* 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);
+
+ 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(log);
g_mutex_unlock(log->fs->lock);
}
-struct cloudlog_header {
- char magic[4];
- uint8_t type;
- BlueSkyCloudID id;
- uint32_t size1, size2, size3;
-} __attribute__((packed));
+/* Look up the cloud log entry for the given ID. If create is TRUE and the
+ * item does not exist, create a special pending entry that can later be filled
+ * in when the real item is loaded. The returned item has a reference held.
+ * As a special case, if a null ID is provided then NULL is returned. */
+BlueSkyCloudLog *bluesky_cloudlog_get(BlueSkyFS *fs, BlueSkyCloudID id)
+{
+ static BlueSkyCloudID id0 = {{0}};
-#define CLOUDLOG_MAGIC "AgI-"
+ if (memcmp(&id, &id0, sizeof(BlueSkyCloudID)) == 0)
+ return NULL;
+
+ g_mutex_lock(fs->lock);
+ BlueSkyCloudLog *item;
+ 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);
+ } else {
+ bluesky_cloudlog_ref(item);
+ }
+ g_mutex_unlock(fs->lock);
+ return item;
+}
/* 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
if (log->data != NULL)
return;
+ /* 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);
log->data = bluesky_log_map_object(log->fs, -1, log->log_seq,
- log->log_offset, log->log_size);
+ offset, log->data_size);
bluesky_cloudlog_stats_update(log, 1);
}
if (log->data == NULL && (log->location_flags & CLOUDLOG_CLOUD)) {
log->location_flags &= ~CLOUDLOG_JOURNAL;
bluesky_cloudlog_stats_update(log, -1);
+ offset = log->location.offset + sizeof(struct cloudlog_header);
log->data = bluesky_log_map_object(log->fs, log->location.directory,
log->location.sequence,
- log->location.offset,
- log->location.size);
+ offset, log->data_size);
bluesky_cloudlog_stats_update(log, 1);
}
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 + sizeof(struct cloudlog_header);
- log->location.size = data1->len;
+ 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);
g_string_append_len(state->data, data2->str, data2->len);
g_string_append_len(state->data, data3->str, data3->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);
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