return item;
}
+/* Attempt to prefetch a cloud log item. This does not guarantee that it will
+ * be made available, but does make it more likely that a future call to
+ * bluesky_cloudlog_fetch will complete quickly. Item must be locked? */
+void bluesky_cloudlog_prefetch(BlueSkyCloudLog *item)
+{
+ if (item->data != NULL)
+ return;
+
+ /* TODO: Some of the code here is duplicated with bluesky_log_map_object.
+ * Refactor to fix that. */
+ BlueSkyFS *fs = item->fs;
+ BlueSkyCacheFile *map = NULL;
+
+ /* First, check to see if the journal still contains a copy of the item and
+ * if so update the atime on the journal so it is likely to be kept around
+ * until we need it. */
+ if ((item->location_flags | item->pending_write) & CLOUDLOG_JOURNAL) {
+ map = bluesky_cachefile_lookup(fs, -1, item->log_seq, TRUE);
+ if (map != NULL) {
+ map->atime = bluesky_get_current_time();
+ bluesky_cachefile_unref(map);
+ g_mutex_unlock(map->lock);
+ return;
+ }
+ }
+
+ item->location_flags &= ~CLOUDLOG_JOURNAL;
+ if (!(item->location_flags & CLOUDLOG_CLOUD))
+ return;
+
+ map = bluesky_cachefile_lookup(fs,
+ item->location.directory,
+ item->location.sequence,
+ FALSE);
+ if (map == NULL)
+ return;
+
+ /* At this point, we have information about the log segment containing the
+ * item we need. If our item is already fetched, we have nothing to do
+ * except update the atime. If not, queue up a fetch of our object. */
+ const BlueSkyRangesetItem *rangeitem;
+ rangeitem = bluesky_rangeset_lookup(map->items,
+ item->location.offset);
+ if (rangeitem == NULL) {
+ if (map->prefetches == NULL)
+ map->prefetches = bluesky_rangeset_new();
+
+ gchar *id = bluesky_cloudlog_id_to_string(item->id);
+ if (bluesky_verbose)
+ g_print("Need to prefetch %s\n", id);
+ g_free(id);
+
+ bluesky_rangeset_insert(map->prefetches,
+ item->location.offset,
+ item->location.size, NULL);
+
+ uint64_t start, length;
+ bluesky_rangeset_get_extents(map->prefetches, &start, &length);
+ if (bluesky_verbose)
+ g_print("Range to prefetch: %"PRIu64" + %"PRIu64"\n",
+ start, length);
+ }
+
+ bluesky_cachefile_unref(map);
+ g_mutex_unlock(map->lock);
+}
+
/* 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. */
if (log->data != NULL)
return;
+ BlueSkyProfile *profile = bluesky_profile_get();
+ if (profile != NULL)
+ bluesky_profile_add_event(profile, g_strdup_printf("Fetch log entry"));
+
/* 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
g_error("Unable to fetch cloudlog entry!");
}
+ if (profile != NULL)
+ bluesky_profile_add_event(profile, g_strdup_printf("Fetch complete"));
g_cond_broadcast(log->cond);
}
bluesky_cloudlog_serialize(ref, fs);
}
+ /* FIXME: Ought lock to be taken earlier? */
g_mutex_lock(log->lock);
bluesky_cloudlog_fetch(log);
g_assert(log->data != NULL);
async2->op = STORE_OP_PUT;
async2->key = g_strdup(async->key);
async2->data = record->data;
+ async2->profile = async->profile;
bluesky_string_ref(record->data);
bluesky_store_async_submit(async2);
bluesky_store_async_add_notifier(async2,
/* Make an decryption pass over a cloud log segment to decrypt items which were
* encrypted. Also computes a list of all offsets which at which valid
- * cloud log items are found and adds those offsets to items (if non-NULL). */
+ * cloud log items are found and adds those offsets to items (if non-NULL).
+ *
+ * If allow_unauth is set to true, then allow a limited set of unauthenticated
+ * items that may have been rewritten by a file system cleaner. These include
+ * the checkpoint and inode map records only; other items must still pass
+ * authentication. */
void bluesky_cloudlog_decrypt(char *segment, size_t len,
BlueSkyCryptKeys *keys,
- BlueSkyRangeset *items)
+ BlueSkyRangeset *items,
+ gboolean allow_unauth)
{
char *data = segment;
size_t remaining_size = len;
+ GUINT32_FROM_LE(header->size3);
if (item_size > remaining_size)
break;
- if (bluesky_crypt_block_decrypt(data, item_size, keys)) {
+ if (bluesky_crypt_block_decrypt(data, item_size, keys, allow_unauth)) {
if (items != NULL) {
- g_print(" data item at %zx\n", offset);
+ if (bluesky_verbose)
+ g_print(" data item at %zx\n", offset);
bluesky_rangeset_insert(items, offset, item_size,
GINT_TO_POINTER(TRUE));
}
projects / bluesky.git / blobdiff