usr/kinit/fstype/btrfs.h

#ifndef __BTRFS_H
#define __BTRFS_H

# define BTRFS_MAGIC "_BHRfS_M"
# define BTRFS_MAGIC_L 8

/*
 * Structure of the super block
 */
struct btrfs_super_block {
	uint8_t csum[32];
	uint8_t fsid[16];
	uint64_t bytenr;
	uint64_t flags;
	uint8_t magic[8];
	uint64_t generation;
	uint64_t root;
	uint64_t chunk_root;
	uint64_t log_root;
	uint64_t log_root_transid;
	uint64_t total_bytes;
	uint64_t bytes_used;
	uint64_t root_dir_objectid;
	uint64_t num_devices;
	uint32_t sectorsize;
	uint32_t nodesize;
	uint32_t leafsize;
	uint32_t stripesize;
	uint32_t sys_chunk_array_size;
	uint64_t chunk_root_generation;
	uint64_t compat_flags;
	uint64_t compat_ro_flags;
	uint64_t incompat_flags;
	uint16_t csum_type;
	uint8_t root_level;
	uint8_t chunk_root_level;
	uint8_t log_root_level;
	struct btrfs_dev_item {
		uint64_t devid;
		uint64_t total_bytes;
		uint64_t bytes_used;
		uint32_t io_align;
		uint32_t io_width;
		uint32_t sector_size;
		uint64_t type;
		uint64_t generation;
		uint64_t start_offset;
		uint32_t dev_group;
		uint8_t seek_speed;
		uint8_t bandwidth;
		uint8_t uuid[16];
		uint8_t fsid[16];
	} __attribute__ ((__packed__)) dev_item;
	uint8_t label[256];
} __attribute__ ((__packed__));

#endif /* __BTRFS_H */