C++ (Cpp) tapdisk_vbd_first_image Examples

Example #1

File: tapdisk-vbd.c Project: dns42/blktap

int
tapdisk_vbd_add_secondary(td_vbd_t *vbd)
{
	td_image_t *leaf, *second = NULL;
	const char *path;
	int type, err;

	DPRINTF("Adding secondary image: %s\n", vbd->secondary_name);

	type = tapdisk_disktype_parse_params(vbd->secondary_name, &path);
	if (type < 0)
		return type;

	leaf = tapdisk_vbd_first_image(vbd);
	if (!leaf) {
		err = -EINVAL;
		goto fail;
	}

	err = tapdisk_image_open(type, path, leaf->flags, &second);
	if (err)
		goto fail;

	if (second->info.size != leaf->info.size) {
		EPRINTF("Secondary image size %"PRIu64" != image size %"PRIu64"\n",
			second->info.size, leaf->info.size);
		err = -EINVAL;
		goto fail;
	}

	vbd->secondary = second;
	leaf->flags |= TD_IGNORE_ENOSPC;
	if (td_flag_test(vbd->flags, TD_OPEN_STANDBY)) {
		DPRINTF("In standby mode\n");
		vbd->secondary_mode = TD_VBD_SECONDARY_STANDBY;
	} else {
		DPRINTF("In mirror mode\n");
		vbd->secondary_mode = TD_VBD_SECONDARY_MIRROR;
		/* we actually need this image to also be part of the chain, 
		 * since it may already contain data */
		list_add(&second->next, &leaf->next);
	}

	DPRINTF("Added secondary image\n");
	return 0;

fail:
	if (second)
		tapdisk_image_close(second);
	return err;
}

Example #2

File: tapdisk-vbd.c Project: Kristoffer/blktap

static int
tapdisk_vbd_add_local_cache(td_vbd_t *vbd)
{
	td_image_t *cache, *parent;
	int err;

	parent = tapdisk_vbd_first_image(vbd);
	if (tapdisk_vbd_is_last_image(vbd, parent)) {
		DPRINTF("Single-image chain, nothing to cache");
		return 0;
	}

	cache = tapdisk_image_allocate(parent->name,
				       DISK_TYPE_LCACHE,
				       parent->flags);

	if (!cache)
		return -ENOMEM;

	/* try to load existing cache */
	err = td_load(cache);
	if (!err)
		goto done;

	cache->driver = tapdisk_driver_allocate(cache->type,
						cache->name,
						cache->flags);
	if (!cache->driver) {
		err = -ENOMEM;
		goto fail;
	}

	cache->driver->info = parent->driver->info;

	/* try to open new cache */
	err = td_open(cache);
	if (!err)
		goto done;

fail:
	tapdisk_image_free(cache);
	return err;

done:
	/* insert cache right above leaf image */
	list_add(&cache->next, &parent->next);

	DPRINTF("Added local_cache driver\n");
	return 0;
}

Example #3

File: tapdisk-vbd.c Project: Kristoffer/blktap

static int
tapdisk_vbd_add_dirty_log(td_vbd_t *vbd)
{
	int err;
	td_driver_t *driver;
	td_image_t *log, *parent;

	driver = NULL;
	log    = NULL;

	parent = tapdisk_vbd_first_image(vbd);

	log    = tapdisk_image_allocate(parent->name,
					DISK_TYPE_LOG,
					parent->flags);
	if (!log)
		return -ENOMEM;

	driver = tapdisk_driver_allocate(log->type,
					 log->name,
					 log->flags);
	if (!driver) {
		err = -ENOMEM;
		goto fail;
	}

	driver->info = parent->driver->info;
	log->driver  = driver;

	err = td_open(log);
	if (err)
		goto fail;

	tapdisk_vbd_add_image(vbd, log);
	return 0;

fail:
	tapdisk_image_free(log);
	return err;
}