C++ (Cpp) btrfs_set_stack_device_id Examples

Example #1

File: disk-io.c Project: AK47POMA/btrfs-progs

int write_all_supers(struct btrfs_root *root)
{
	struct list_head *cur;
	struct list_head *head = &root->fs_info->fs_devices->devices;
	struct btrfs_device *dev;
	struct btrfs_super_block *sb;
	struct btrfs_dev_item *dev_item;
	int ret;
	u64 flags;

	sb = root->fs_info->super_copy;
	dev_item = &sb->dev_item;
	list_for_each(cur, head) {
		dev = list_entry(cur, struct btrfs_device, dev_list);
		if (!dev->writeable)
			continue;

		btrfs_set_stack_device_generation(dev_item, 0);
		btrfs_set_stack_device_type(dev_item, dev->type);
		btrfs_set_stack_device_id(dev_item, dev->devid);
		btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
		btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
		btrfs_set_stack_device_io_align(dev_item, dev->io_align);
		btrfs_set_stack_device_io_width(dev_item, dev->io_width);
		btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
		memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
		memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);

		flags = btrfs_super_flags(sb);
		btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);

		ret = write_dev_supers(root, sb, dev);
		BUG_ON(ret);
	}

Example #2

File: utils.c Project: AnupBansod/assignments

int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
		      struct btrfs_root *root, int fd, char *path,
		      u64 block_count, u32 io_width, u32 io_align,
		      u32 sectorsize)
{
	struct btrfs_super_block *disk_super;
	struct btrfs_super_block *super = root->fs_info->super_copy;
	struct btrfs_device *device;
	struct btrfs_dev_item *dev_item;
	char *buf;
	u64 total_bytes;
	u64 num_devs;
	int ret;

	device = kzalloc(sizeof(*device), GFP_NOFS);
	if (!device)
		return -ENOMEM;
	buf = kmalloc(sectorsize, GFP_NOFS);
	if (!buf) {
		kfree(device);
		return -ENOMEM;
	}
	BUG_ON(sizeof(*disk_super) > sectorsize);
	memset(buf, 0, sectorsize);

	disk_super = (struct btrfs_super_block *)buf;
	dev_item = &disk_super->dev_item;

	uuid_generate(device->uuid);
	device->devid = 0;
	device->type = 0;
	device->io_width = io_width;
	device->io_align = io_align;
	device->sector_size = sectorsize;
	device->fd = fd;
	device->writeable = 1;
	device->total_bytes = block_count;
	device->bytes_used = 0;
	device->total_ios = 0;
	device->dev_root = root->fs_info->dev_root;

	ret = btrfs_add_device(trans, root, device);
	BUG_ON(ret);

	total_bytes = btrfs_super_total_bytes(super) + block_count;
	btrfs_set_super_total_bytes(super, total_bytes);

	num_devs = btrfs_super_num_devices(super) + 1;
	btrfs_set_super_num_devices(super, num_devs);

	memcpy(disk_super, super, sizeof(*disk_super));

	printf("adding device %s id %llu\n", path,
	       (unsigned long long)device->devid);

	btrfs_set_super_bytenr(disk_super, BTRFS_SUPER_INFO_OFFSET);
	btrfs_set_stack_device_id(dev_item, device->devid);
	btrfs_set_stack_device_type(dev_item, device->type);
	btrfs_set_stack_device_io_align(dev_item, device->io_align);
	btrfs_set_stack_device_io_width(dev_item, device->io_width);
	btrfs_set_stack_device_sector_size(dev_item, device->sector_size);
	btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes);
	btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used);
	memcpy(&dev_item->uuid, device->uuid, BTRFS_UUID_SIZE);

	ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
	BUG_ON(ret != sectorsize);

	kfree(buf);
	list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
	device->fs_devices = root->fs_info->fs_devices;
	return 0;
}