mirror of
https://github.com/reactos/reactos.git
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403 lines
9 KiB
C
403 lines
9 KiB
C
/* btrfs.h
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* Generic btrfs header file. Thanks to whoever it was who wrote
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* https://btrfs.wiki.kernel.org/index.php/On-disk_Format - you saved me a lot of time!
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*
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* I release this file, and this file only, into the public domain - do whatever
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* you want with it. You don't have to, but I'd appreciate if you let me know if you
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* use it anything cool - mark@harmstone.com. */
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#ifndef BTRFS_H_DEFINED
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#define BTRFS_H_DEFINED
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static const UINT64 superblock_addrs[] = { 0x10000, 0x4000000, 0x4000000000, 0x4000000000000, 0 };
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#define BTRFS_MAGIC 0x4d5f53665248425f
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#define MAX_LABEL_SIZE 0x100
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#define SUBVOL_ROOT_INODE 0x100
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#define TYPE_INODE_ITEM 0x01
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#define TYPE_INODE_REF 0x0C
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#define TYPE_INODE_EXTREF 0x0D
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#define TYPE_XATTR_ITEM 0x18
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#define TYPE_DIR_ITEM 0x54
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#define TYPE_DIR_INDEX 0x60
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#define TYPE_EXTENT_DATA 0x6C
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#define TYPE_EXTENT_CSUM 0x80
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#define TYPE_ROOT_ITEM 0x84
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#define TYPE_ROOT_BACKREF 0x90
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#define TYPE_ROOT_REF 0x9C
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#define TYPE_EXTENT_ITEM 0xA8
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#define TYPE_METADATA_ITEM 0xA9
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#define TYPE_TREE_BLOCK_REF 0xB0
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#define TYPE_EXTENT_DATA_REF 0xB2
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#define TYPE_EXTENT_REF_V0 0xB4
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#define TYPE_SHARED_BLOCK_REF 0xB6
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#define TYPE_SHARED_DATA_REF 0xB8
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#define TYPE_BLOCK_GROUP_ITEM 0xC0
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#define TYPE_DEV_EXTENT 0xCC
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#define TYPE_DEV_ITEM 0xD8
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#define TYPE_CHUNK_ITEM 0xE4
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#define BTRFS_ROOT_ROOT 1
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#define BTRFS_ROOT_EXTENT 2
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#define BTRFS_ROOT_CHUNK 3
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#define BTRFS_ROOT_DEVTREE 4
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#define BTRFS_ROOT_FSTREE 5
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#define BTRFS_ROOT_CHECKSUM 7
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#define BTRFS_COMPRESSION_NONE 0
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#define BTRFS_COMPRESSION_ZLIB 1
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#define BTRFS_COMPRESSION_LZO 2
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#define BTRFS_ENCRYPTION_NONE 0
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#define BTRFS_ENCODING_NONE 0
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#define EXTENT_TYPE_INLINE 0
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#define EXTENT_TYPE_REGULAR 1
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#define EXTENT_TYPE_PREALLOC 2
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#define BLOCK_FLAG_DATA 0x001
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#define BLOCK_FLAG_SYSTEM 0x002
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#define BLOCK_FLAG_METADATA 0x004
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#define BLOCK_FLAG_RAID0 0x008
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#define BLOCK_FLAG_RAID1 0x010
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#define BLOCK_FLAG_DUPLICATE 0x020
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#define BLOCK_FLAG_RAID10 0x040
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#define BLOCK_FLAG_RAID5 0x080
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#define BLOCK_FLAG_RAID6 0x100
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#define FREE_SPACE_CACHE_ID 0xFFFFFFFFFFFFFFF5
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#define EXTENT_CSUM_ID 0xFFFFFFFFFFFFFFF6
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#define BTRFS_INODE_NODATASUM 0x001
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#define BTRFS_INODE_NODATACOW 0x002
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#define BTRFS_INODE_READONLY 0x004
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#define BTRFS_INODE_NOCOMPRESS 0x008
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#define BTRFS_INODE_PREALLOC 0x010
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#define BTRFS_INODE_SYNC 0x020
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#define BTRFS_INODE_IMMUTABLE 0x040
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#define BTRFS_INODE_APPEND 0x080
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#define BTRFS_INODE_NODUMP 0x100
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#define BTRFS_INODE_NOATIME 0x200
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#define BTRFS_INODE_DIRSYNC 0x400
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#define BTRFS_INODE_COMPRESS 0x800
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#define BTRFS_SUBVOL_READONLY 0x1
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#define BTRFS_COMPAT_RO_FLAGS_FREE_SPACE_CACHE 0x1
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#define BTRFS_INCOMPAT_FLAGS_MIXED_BACKREF 0x0001
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#define BTRFS_INCOMPAT_FLAGS_DEFAULT_SUBVOL 0x0002
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#define BTRFS_INCOMPAT_FLAGS_MIXED_GROUPS 0x0004
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#define BTRFS_INCOMPAT_FLAGS_COMPRESS_LZO 0x0008
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#define BTRFS_INCOMPAT_FLAGS_COMPRESS_LZOV2 0x0010
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#define BTRFS_INCOMPAT_FLAGS_BIG_METADATA 0x0020
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#define BTRFS_INCOMPAT_FLAGS_EXTENDED_IREF 0x0040
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#define BTRFS_INCOMPAT_FLAGS_RAID56 0x0080
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#define BTRFS_INCOMPAT_FLAGS_SKINNY_METADATA 0x0100
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#define BTRFS_INCOMPAT_FLAGS_NO_HOLES 0x0200
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#pragma pack(push, 1)
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typedef struct {
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UINT8 uuid[16];
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} BTRFS_UUID;
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typedef struct {
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UINT64 obj_id;
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UINT8 obj_type;
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UINT64 offset;
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} KEY;
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#define HEADER_FLAG_MIXED_BACKREF 0x100000000000000
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#define HEADER_FLAG_SHARED_BACKREF 0x000000000000002
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typedef struct {
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UINT8 csum[32];
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BTRFS_UUID fs_uuid;
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UINT64 address;
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UINT64 flags;
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BTRFS_UUID chunk_tree_uuid;
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UINT64 generation;
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UINT64 tree_id;
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UINT32 num_items;
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UINT8 level;
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} tree_header;
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typedef struct {
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KEY key;
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UINT32 offset;
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UINT32 size;
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} leaf_node;
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typedef struct {
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KEY key;
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UINT64 address;
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UINT64 generation;
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} internal_node;
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typedef struct {
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UINT64 dev_id;
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UINT64 num_bytes;
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UINT64 bytes_used;
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UINT32 optimal_io_align;
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UINT32 optimal_io_width;
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UINT32 minimal_io_size;
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UINT64 type;
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UINT64 generation;
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UINT64 start_offset;
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UINT32 dev_group;
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UINT8 seek_speed;
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UINT8 bandwidth;
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BTRFS_UUID device_uuid;
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BTRFS_UUID fs_uuid;
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} DEV_ITEM;
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#define SYS_CHUNK_ARRAY_SIZE 0x800
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typedef struct {
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UINT8 checksum[32];
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BTRFS_UUID uuid;
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UINT64 sb_phys_addr;
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UINT64 flags;
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UINT64 magic;
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UINT64 generation;
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UINT64 root_tree_addr;
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UINT64 chunk_tree_addr;
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UINT64 log_tree_addr;
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UINT64 log_root_transid;
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UINT64 total_bytes;
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UINT64 bytes_used;
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UINT64 root_dir_objectid;
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UINT64 num_devices;
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UINT32 sector_size;
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UINT32 node_size;
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UINT32 leaf_size;
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UINT32 stripe_size;
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UINT32 n;
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UINT64 chunk_root_generation;
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UINT64 compat_flags;
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UINT64 compat_ro_flags;
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UINT64 incompat_flags;
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UINT16 csum_type;
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UINT8 root_level;
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UINT8 chunk_root_level;
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UINT8 log_root_level;
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DEV_ITEM dev_item;
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char label[MAX_LABEL_SIZE];
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UINT64 cache_generation;
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UINT64 uuid_tree_generation;
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UINT64 reserved[30];
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UINT8 sys_chunk_array[SYS_CHUNK_ARRAY_SIZE];
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// struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
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UINT8 reserved2[1237];
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} superblock;
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#define BTRFS_TYPE_UNKNOWN 0
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#define BTRFS_TYPE_FILE 1
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#define BTRFS_TYPE_DIRECTORY 2
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#define BTRFS_TYPE_CHARDEV 3
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#define BTRFS_TYPE_BLOCKDEV 4
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#define BTRFS_TYPE_FIFO 5
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#define BTRFS_TYPE_SOCKET 6
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#define BTRFS_TYPE_SYMLINK 7
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#define BTRFS_TYPE_EA 8
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typedef struct {
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KEY key;
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UINT64 transid;
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UINT16 m;
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UINT16 n;
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UINT8 type;
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char name[1];
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} DIR_ITEM;
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typedef struct {
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UINT64 seconds;
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UINT32 nanoseconds;
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} BTRFS_TIME;
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typedef struct {
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UINT64 generation;
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UINT64 transid;
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UINT64 st_size;
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UINT64 st_blocks;
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UINT64 block_group;
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UINT32 st_nlink;
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UINT32 st_uid;
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UINT32 st_gid;
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UINT32 st_mode;
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UINT64 st_rdev;
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UINT64 flags;
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UINT64 sequence;
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UINT8 reserved[32];
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BTRFS_TIME st_atime;
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BTRFS_TIME st_ctime;
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BTRFS_TIME st_mtime;
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BTRFS_TIME otime;
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} INODE_ITEM;
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typedef struct {
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INODE_ITEM inode;
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UINT64 generation;
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UINT64 objid;
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UINT64 block_number;
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UINT64 byte_limit;
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UINT64 bytes_used;
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UINT64 last_snapshot_generation;
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UINT64 flags;
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UINT32 num_references;
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KEY drop_progress;
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UINT8 drop_level;
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UINT8 root_level;
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UINT64 generation2;
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BTRFS_UUID uuid;
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BTRFS_UUID parent_uuid;
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BTRFS_UUID received_uuid;
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UINT64 ctransid;
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UINT64 otransid;
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UINT64 stransid;
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UINT64 rtransid;
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BTRFS_TIME ctime;
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BTRFS_TIME otime;
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BTRFS_TIME stime;
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BTRFS_TIME rtime;
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UINT64 reserved[8];
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} ROOT_ITEM;
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typedef struct {
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UINT64 size;
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UINT64 root_id;
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UINT64 stripe_length;
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UINT64 type;
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UINT32 opt_io_alignment;
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UINT32 opt_io_width;
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UINT32 sector_size;
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UINT16 num_stripes;
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UINT16 sub_stripes;
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} CHUNK_ITEM;
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typedef struct {
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UINT64 dev_id;
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UINT64 offset;
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BTRFS_UUID dev_uuid;
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} CHUNK_ITEM_STRIPE;
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typedef struct {
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UINT64 generation;
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UINT64 decoded_size;
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UINT8 compression;
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UINT8 encryption;
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UINT16 encoding;
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UINT8 type;
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UINT8 data[1];
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} EXTENT_DATA;
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typedef struct {
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UINT64 address;
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UINT64 size;
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UINT64 offset;
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UINT64 num_bytes;
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} EXTENT_DATA2;
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typedef struct {
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UINT64 index;
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UINT16 n;
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char name[1];
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} INODE_REF;
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typedef struct {
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UINT64 dir;
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UINT64 index;
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UINT16 n;
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char name[1];
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} INODE_EXTREF;
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#define EXTENT_ITEM_DATA 0x001
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#define EXTENT_ITEM_TREE_BLOCK 0x002
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#define EXTENT_ITEM_SHARED_BACKREFS 0x100
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typedef struct {
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UINT64 refcount;
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UINT64 generation;
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UINT64 flags;
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} EXTENT_ITEM;
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typedef struct {
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UINT32 refcount;
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} EXTENT_ITEM_V0;
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typedef struct {
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EXTENT_ITEM extent_item;
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KEY firstitem;
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UINT8 level;
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} EXTENT_ITEM_TREE;
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typedef struct {
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UINT64 offset;
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} TREE_BLOCK_REF;
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typedef struct {
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UINT64 root;
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UINT64 objid;
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UINT64 offset;
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UINT32 count;
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} EXTENT_DATA_REF;
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typedef struct {
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UINT64 used;
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UINT64 chunk_tree;
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UINT64 flags;
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} BLOCK_GROUP_ITEM;
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typedef struct {
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UINT64 root;
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UINT64 gen;
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UINT64 objid;
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UINT64 count;
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} EXTENT_REF_V0;
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typedef struct {
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UINT64 offset;
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} SHARED_BLOCK_REF;
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typedef struct {
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UINT64 offset;
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UINT32 count;
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} SHARED_DATA_REF;
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#define FREE_SPACE_EXTENT 1
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#define FREE_SPACE_BITMAP 2
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typedef struct {
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UINT64 offset;
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UINT64 size;
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UINT8 type;
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} FREE_SPACE_ENTRY;
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typedef struct {
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KEY key;
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UINT64 generation;
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UINT64 num_entries;
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UINT64 num_bitmaps;
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} FREE_SPACE_ITEM;
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typedef struct {
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UINT64 dir;
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UINT64 index;
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UINT16 n;
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char name[1];
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} ROOT_REF;
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typedef struct {
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UINT64 chunktree;
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UINT64 objid;
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UINT64 address;
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UINT64 length;
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BTRFS_UUID chunktree_uuid;
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} DEV_EXTENT;
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#pragma pack(pop)
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#endif
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