+} ExternalSnapshotStates;
+
+static void external_snapshot_prepare(BlkTransactionStates *common,
+ Error **errp)
+{
+ BlockDriver *proto_drv;
+ BlockDriver *drv;
+ int flags, ret;
+ Error *local_err = NULL;
+ const char *device;
+ const char *new_image_file;
+ const char *format = "qcow2";
+ enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
+ ExternalSnapshotStates *states =
+ DO_UPCAST(ExternalSnapshotStates, common, common);
+ TransactionAction *action = common->action;
+
+ /* get parameters */
+ g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
+
+ device = action->blockdev_snapshot_sync->device;
+ new_image_file = action->blockdev_snapshot_sync->snapshot_file;
+ if (action->blockdev_snapshot_sync->has_format) {
+ format = action->blockdev_snapshot_sync->format;
+ }
+ if (action->blockdev_snapshot_sync->has_mode) {
+ mode = action->blockdev_snapshot_sync->mode;
+ }
+
+ /* start processing */
+ drv = bdrv_find_format(format);
+ if (!drv) {
+ error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
+ return;
+ }
+
+ states->old_bs = bdrv_find(device);
+ if (!states->old_bs) {
+ error_set(errp, QERR_DEVICE_NOT_FOUND, device);
+ return;
+ }
+
+ if (!bdrv_is_inserted(states->old_bs)) {
+ error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
+ return;
+ }
+
+ if (bdrv_in_use(states->old_bs)) {
+ error_set(errp, QERR_DEVICE_IN_USE, device);
+ return;
+ }
+
+ if (!bdrv_is_read_only(states->old_bs)) {
+ if (bdrv_flush(states->old_bs)) {
+ error_set(errp, QERR_IO_ERROR);
+ return;
+ }
+ }
+
+ flags = states->old_bs->open_flags;
+
+ proto_drv = bdrv_find_protocol(new_image_file);
+ if (!proto_drv) {
+ error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
+ return;
+ }
+
+ /* create new image w/backing file */
+ if (mode != NEW_IMAGE_MODE_EXISTING) {
+ bdrv_img_create(new_image_file, format,
+ states->old_bs->filename,
+ states->old_bs->drv->format_name,
+ NULL, -1, flags, &local_err, false);
+ if (error_is_set(&local_err)) {
+ error_propagate(errp, local_err);
+ return;
+ }
+ }
+
+ /* We will manually add the backing_hd field to the bs later */
+ states->new_bs = bdrv_new("");
+ /* TODO Inherit bs->options or only take explicit options with an
+ * extended QMP command? */
+ ret = bdrv_open(states->new_bs, new_image_file, NULL,
+ flags | BDRV_O_NO_BACKING, drv);
+ if (ret != 0) {
+ error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
+ }
+}
+
+static void external_snapshot_commit(BlkTransactionStates *common)
+{
+ ExternalSnapshotStates *states =
+ DO_UPCAST(ExternalSnapshotStates, common, common);
+
+ /* This removes our old bs from the bdrv_states, and adds the new bs */
+ bdrv_append(states->new_bs, states->old_bs);
+ /* We don't need (or want) to use the transactional
+ * bdrv_reopen_multiple() across all the entries at once, because we
+ * don't want to abort all of them if one of them fails the reopen */
+ bdrv_reopen(states->new_bs, states->new_bs->open_flags & ~BDRV_O_RDWR,
+ NULL);
+}
+
+static void external_snapshot_abort(BlkTransactionStates *common)
+{
+ ExternalSnapshotStates *states =
+ DO_UPCAST(ExternalSnapshotStates, common, common);
+ if (states->new_bs) {
+ bdrv_delete(states->new_bs);
+ }
+}
+
+static const BdrvActionOps actions[] = {
+ [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
+ .instance_size = sizeof(ExternalSnapshotStates),
+ .prepare = external_snapshot_prepare,
+ .commit = external_snapshot_commit,
+ .abort = external_snapshot_abort,
+ },
+};
projects / qemu.git / blobdiff