| #ifndef _BTRFS_H_ |
| #define _BTRFS_H_ |
| |
| #include <asm/types.h> |
| #include <linux/ioctl.h> |
| |
| #define BTRFS_SUPER_MAGIC 0x9123683E |
| #define BTRFS_SUPER_INFO_OFFSET (64 * 1024) |
| #define BTRFS_SUPER_INFO_SIZE 4096 |
| #define BTRFS_MAGIC "_BHRfS_M" |
| #define BTRFS_MAGIC_L 8 |
| #define BTRFS_CSUM_SIZE 32 |
| #define BTRFS_FSID_SIZE 16 |
| #define BTRFS_UUID_SIZE 16 |
| |
| /* Fixed areas reserved for the boot loader */ |
| #define BTRFS_BOOT_AREA_A_OFFSET 0 |
| #define BTRFS_BOOT_AREA_A_SIZE BTRFS_SUPER_INFO_OFFSET |
| #define BTRFS_BOOT_AREA_B_OFFSET (256 * 1024) |
| #define BTRFS_BOOT_AREA_B_SIZE ((1024-256) * 1024) |
| |
| typedef __u64 u64; |
| typedef __u32 u32; |
| typedef __u16 u16; |
| typedef __u8 u8; |
| typedef u64 __le64; |
| typedef u16 __le16; |
| |
| #define BTRFS_ROOT_BACKREF_KEY 144 |
| #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL |
| #define BTRFS_DIR_ITEM_KEY 84 |
| |
| /* |
| * * this is used for both forward and backward root refs |
| * */ |
| struct btrfs_root_ref { |
| __le64 dirid; |
| __le64 sequence; |
| __le16 name_len; |
| } __attribute__ ((__packed__)); |
| |
| struct btrfs_disk_key { |
| __le64 objectid; |
| u8 type; |
| __le64 offset; |
| } __attribute__ ((__packed__)); |
| |
| struct btrfs_dir_item { |
| struct btrfs_disk_key location; |
| __le64 transid; |
| __le16 data_len; |
| __le16 name_len; |
| u8 type; |
| } __attribute__ ((__packed__)); |
| |
| 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__)); |
| |
| #define BTRFS_IOCTL_MAGIC 0x94 |
| #define BTRFS_VOL_NAME_MAX 255 |
| #define BTRFS_PATH_NAME_MAX 4087 |
| |
| struct btrfs_ioctl_vol_args { |
| __s64 fd; |
| char name[BTRFS_PATH_NAME_MAX + 1]; |
| }; |
| |
| struct btrfs_ioctl_search_key { |
| /* which root are we searching. 0 is the tree of tree roots */ |
| __u64 tree_id; |
| |
| /* keys returned will be >= min and <= max */ |
| __u64 min_objectid; |
| __u64 max_objectid; |
| |
| /* keys returned will be >= min and <= max */ |
| __u64 min_offset; |
| __u64 max_offset; |
| |
| /* max and min transids to search for */ |
| __u64 min_transid; |
| __u64 max_transid; |
| |
| /* keys returned will be >= min and <= max */ |
| __u32 min_type; |
| __u32 max_type; |
| |
| /* |
| * how many items did userland ask for, and how many are we |
| * returning |
| */ |
| __u32 nr_items; |
| |
| /* align to 64 bits */ |
| __u32 unused; |
| |
| /* some extra for later */ |
| __u64 unused1; |
| __u64 unused2; |
| __u64 unused3; |
| __u64 unused4; |
| }; |
| |
| struct btrfs_ioctl_search_header { |
| __u64 transid; |
| __u64 objectid; |
| __u64 offset; |
| __u32 type; |
| __u32 len; |
| } __attribute__((may_alias)); |
| |
| #define BTRFS_DEVICE_PATH_NAME_MAX 1024 |
| struct btrfs_ioctl_dev_info_args { |
| __u64 devid; /* in/out */ |
| __u8 uuid[BTRFS_UUID_SIZE]; /* in/out */ |
| __u64 bytes_used; /* out */ |
| __u64 total_bytes; /* out */ |
| __u64 unused[379]; /* pad to 4k */ |
| __u8 path[BTRFS_DEVICE_PATH_NAME_MAX]; /* out */ |
| }; |
| |
| struct btrfs_ioctl_fs_info_args { |
| __u64 max_id; /* out */ |
| __u64 num_devices; /* out */ |
| __u8 fsid[BTRFS_FSID_SIZE]; /* out */ |
| __u64 reserved[124]; /* pad to 1k */ |
| }; |
| |
| #define BTRFS_SEARCH_ARGS_BUFSIZE (4096 - sizeof(struct btrfs_ioctl_search_key)) |
| /* |
| * the buf is an array of search headers where |
| * each header is followed by the actual item |
| * the type field is expanded to 32 bits for alignment |
| */ |
| struct btrfs_ioctl_search_args { |
| struct btrfs_ioctl_search_key key; |
| char buf[BTRFS_SEARCH_ARGS_BUFSIZE]; |
| }; |
| |
| #define BTRFS_IOC_TREE_SEARCH _IOWR(BTRFS_IOCTL_MAGIC, 17, \ |
| struct btrfs_ioctl_search_args) |
| #define BTRFS_IOC_DEV_INFO _IOWR(BTRFS_IOCTL_MAGIC, 30, \ |
| struct btrfs_ioctl_dev_info_args) |
| #define BTRFS_IOC_FS_INFO _IOR(BTRFS_IOCTL_MAGIC, 31, \ |
| struct btrfs_ioctl_fs_info_args) |
| |
| #endif |