#include <fs/crc32c.h>
#include <pshpack1.h>
#include <poppack.h>

Include dependency graph for btrfs.h:

This graph shows which files directly or indirectly include this file:

Classes
struct	btrfs_disk_key

struct	btrfs_header

struct	btrfs_item

struct	btrfs_leaf

struct	btrfs_key_ptr

struct	btrfs_node

struct	btrfs_dev_item

struct	btrfs_stripe

struct	btrfs_chunk

struct	btrfs_inode_ref

struct	btrfs_timespec

struct	btrfs_inode_item

struct	btrfs_dir_item

struct	btrfs_root_item

struct	btrfs_root_ref

struct	btrfs_file_extent_item

struct	btrfs_super_block

union	tree_buf

struct	btrfs_path

struct	btrfs_chunk_map_item

struct	btrfs_chunk_map

struct	btrfs_file_info

Macros
#define	btrfs_crc32c(name, len) crc32c_le((u32)~1, name, len)

#define	BTRFS_SUPER_INFO_OFFSET (64 * 1024)

#define	BTRFS_SUPER_INFO_SIZE 4096

#define	BTRFS_MAX_LEAF_SIZE 4096

#define	BTRFS_BLOCK_SHIFT 12

#define	BTRFS_BLOCK_SIZE (1 << BTRFS_BLOCK_SHIFT)

#define	BTRFS_SUPER_MIRROR_MAX 3

#define	BTRFS_SUPER_MIRROR_SHIFT 12

#define	BTRFS_CSUM_SIZE 32

#define	BTRFS_FSID_SIZE 16

#define	BTRFS_LABEL_SIZE 256

#define	BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048

#define	BTRFS_UUID_SIZE 16

#define	BTRFS_VOL_NAME_MAX 255

#define	BTRFS_NAME_MAX 255

#define	BTRFS_MAGIC "_BHRfS_M"

#define	BTRFS_MAGIC_L 8

#define	BTRFS_MAGIC_N 0x4d5f53665248425fULL

#define	BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)

#define	BTRFS_DEV_ITEM_KEY 216

#define	BTRFS_CHUNK_ITEM_KEY 228

#define	BTRFS_ROOT_REF_KEY 156

#define	BTRFS_ROOT_ITEM_KEY 132

#define	BTRFS_EXTENT_DATA_KEY 108

#define	BTRFS_DIR_ITEM_KEY 84

#define	BTRFS_DIR_INDEX_KEY 96

#define	BTRFS_INODE_ITEM_KEY 1

#define	BTRFS_INODE_REF_KEY 12

#define	BTRFS_EXTENT_TREE_OBJECTID 2ULL

#define	BTRFS_FS_TREE_OBJECTID 5ULL

#define	BTRFS_FIRST_FREE_OBJECTID 256ULL

#define	BTRFS_LAST_FREE_OBJECTID -256ULL

#define	BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL

#define	BTRFS_FILE_EXTENT_INLINE 0

#define	BTRFS_FILE_EXTENT_REG 1

#define	BTRFS_FILE_EXTENT_PREALLOC 2

#define	BTRFS_MAX_LEVEL 8

#define	BTRFS_MAX_CHUNK_ENTRIES 256

#define	BTRFS_DEV_ITEMS_OBJECTID 1ULL

#define	BTRFS_FT_UNKNOWN 0

#define	BTRFS_FT_REG_FILE 1

#define	BTRFS_FT_DIR 2

#define	BTRFS_FT_SYMLINK 7

#define	BTRFS_FT_XATTR 8

#define	BTRFS_FT_MAX 9

#define	BTRFS_COMPRESS_NONE 0

#define	BTRFS_COMPRESS_ZLIB 1

#define	BTRFS_COMPRESS_LZO 2

#define	ROOT_DIR_WORD 0x002f

Typedefs
typedef UCHAR	u8

typedef USHORT	u16

typedef ULONG32	u32

typedef ULONG64	u64

typedef u8	__u8

typedef u16	__u16

typedef u32	__u32

typedef u64	__u64

typedef struct _BTRFS_INFO *	PBTRFS_INFO

typedef struct btrfs_file_info *	pbtrfs_file_info

Functions
ULONGLONG	BtrFsGetVolumeSize (_In_ ULONG DeviceId)
	Returns the size of the BTRFS volume laid on the storage media device opened via `DeviceId`.

const DEVVTBL *	BtrFsMount (ULONG DeviceId)

Macro Definition Documentation

◆ BTRFS_BLOCK_SHIFT

#define BTRFS_BLOCK_SHIFT 12

Definition at line 28 of file btrfs.h.

◆ BTRFS_BLOCK_SIZE

#define BTRFS_BLOCK_SIZE (1 << BTRFS_BLOCK_SHIFT)

Definition at line 29 of file btrfs.h.

◆ BTRFS_CHUNK_ITEM_KEY

#define BTRFS_CHUNK_ITEM_KEY 228

Definition at line 49 of file btrfs.h.

◆ BTRFS_COMPRESS_LZO

#define BTRFS_COMPRESS_LZO 2

Definition at line 83 of file btrfs.h.

◆ BTRFS_COMPRESS_NONE

#define BTRFS_COMPRESS_NONE 0

Definition at line 81 of file btrfs.h.

◆ BTRFS_COMPRESS_ZLIB

#define BTRFS_COMPRESS_ZLIB 1

Definition at line 82 of file btrfs.h.

◆ btrfs_crc32c

#define btrfs_crc32c	(	name,
		len
	)	crc32c_le((u32)~1, name, len)

Definition at line 23 of file btrfs.h.

◆ BTRFS_CSUM_SIZE

#define BTRFS_CSUM_SIZE 32

Definition at line 33 of file btrfs.h.

◆ BTRFS_DEV_ITEM_KEY

#define BTRFS_DEV_ITEM_KEY 216

Definition at line 48 of file btrfs.h.

◆ BTRFS_DEV_ITEMS_OBJECTID

#define BTRFS_DEV_ITEMS_OBJECTID 1ULL

Definition at line 72 of file btrfs.h.

◆ BTRFS_DIR_INDEX_KEY

#define BTRFS_DIR_INDEX_KEY 96

Definition at line 54 of file btrfs.h.

◆ BTRFS_DIR_ITEM_KEY

#define BTRFS_DIR_ITEM_KEY 84

Definition at line 53 of file btrfs.h.

◆ BTRFS_EXTENT_DATA_KEY

#define BTRFS_EXTENT_DATA_KEY 108

Definition at line 52 of file btrfs.h.

◆ BTRFS_EXTENT_TREE_OBJECTID

#define BTRFS_EXTENT_TREE_OBJECTID 2ULL

Definition at line 58 of file btrfs.h.

◆ BTRFS_FILE_EXTENT_INLINE

#define BTRFS_FILE_EXTENT_INLINE 0

Definition at line 65 of file btrfs.h.

◆ BTRFS_FILE_EXTENT_PREALLOC

#define BTRFS_FILE_EXTENT_PREALLOC 2

Definition at line 67 of file btrfs.h.

◆ BTRFS_FILE_EXTENT_REG

#define BTRFS_FILE_EXTENT_REG 1

Definition at line 66 of file btrfs.h.

◆ BTRFS_FIRST_CHUNK_TREE_OBJECTID

#define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL

Definition at line 63 of file btrfs.h.

◆ BTRFS_FIRST_FREE_OBJECTID

#define BTRFS_FIRST_FREE_OBJECTID 256ULL

Definition at line 61 of file btrfs.h.

◆ BTRFS_FS_TREE_OBJECTID

#define BTRFS_FS_TREE_OBJECTID 5ULL

Definition at line 59 of file btrfs.h.

◆ BTRFS_FSID_SIZE

#define BTRFS_FSID_SIZE 16

Definition at line 34 of file btrfs.h.

◆ BTRFS_FT_DIR

#define BTRFS_FT_DIR 2

Definition at line 76 of file btrfs.h.

◆ BTRFS_FT_MAX

#define BTRFS_FT_MAX 9

Definition at line 79 of file btrfs.h.

◆ BTRFS_FT_REG_FILE

#define BTRFS_FT_REG_FILE 1

Definition at line 75 of file btrfs.h.

◆ BTRFS_FT_SYMLINK

#define BTRFS_FT_SYMLINK 7

Definition at line 77 of file btrfs.h.

◆ BTRFS_FT_UNKNOWN

#define BTRFS_FT_UNKNOWN 0

Definition at line 74 of file btrfs.h.

◆ BTRFS_FT_XATTR

#define BTRFS_FT_XATTR 8

Definition at line 78 of file btrfs.h.

◆ BTRFS_INODE_ITEM_KEY

#define BTRFS_INODE_ITEM_KEY 1

Definition at line 55 of file btrfs.h.

◆ BTRFS_INODE_REF_KEY

#define BTRFS_INODE_REF_KEY 12

Definition at line 56 of file btrfs.h.

◆ BTRFS_LABEL_SIZE

#define BTRFS_LABEL_SIZE 256

Definition at line 35 of file btrfs.h.

◆ BTRFS_LAST_FREE_OBJECTID

#define BTRFS_LAST_FREE_OBJECTID -256ULL

Definition at line 62 of file btrfs.h.

◆ BTRFS_MAGIC

#define BTRFS_MAGIC "_BHRfS_M"

Definition at line 42 of file btrfs.h.

◆ BTRFS_MAGIC_L

#define BTRFS_MAGIC_L 8

Definition at line 43 of file btrfs.h.

◆ BTRFS_MAGIC_N

#define BTRFS_MAGIC_N 0x4d5f53665248425fULL

Definition at line 44 of file btrfs.h.

◆ BTRFS_MAX_CHUNK_ENTRIES

#define BTRFS_MAX_CHUNK_ENTRIES 256

Definition at line 70 of file btrfs.h.

◆ BTRFS_MAX_LEAF_SIZE

#define BTRFS_MAX_LEAF_SIZE 4096

Definition at line 27 of file btrfs.h.

◆ BTRFS_MAX_LEVEL

#define BTRFS_MAX_LEVEL 8

Definition at line 69 of file btrfs.h.

◆ BTRFS_NAME_MAX

#define BTRFS_NAME_MAX 255

Definition at line 40 of file btrfs.h.

◆ BTRFS_ROOT_ITEM_KEY

#define BTRFS_ROOT_ITEM_KEY 132

Definition at line 51 of file btrfs.h.

◆ BTRFS_ROOT_REF_KEY

#define BTRFS_ROOT_REF_KEY 156

Definition at line 50 of file btrfs.h.

◆ BTRFS_SUPER_FLAG_METADUMP

#define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)

Definition at line 46 of file btrfs.h.

◆ BTRFS_SUPER_INFO_OFFSET

#define BTRFS_SUPER_INFO_OFFSET (64 * 1024)

Definition at line 25 of file btrfs.h.

◆ BTRFS_SUPER_INFO_SIZE

#define BTRFS_SUPER_INFO_SIZE 4096

Definition at line 26 of file btrfs.h.

◆ BTRFS_SUPER_MIRROR_MAX

#define BTRFS_SUPER_MIRROR_MAX 3

Definition at line 31 of file btrfs.h.

◆ BTRFS_SUPER_MIRROR_SHIFT

#define BTRFS_SUPER_MIRROR_SHIFT 12

Definition at line 32 of file btrfs.h.

◆ BTRFS_SYSTEM_CHUNK_ARRAY_SIZE

#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048

Definition at line 36 of file btrfs.h.

◆ BTRFS_UUID_SIZE

#define BTRFS_UUID_SIZE 16

Definition at line 37 of file btrfs.h.

◆ BTRFS_VOL_NAME_MAX

#define BTRFS_VOL_NAME_MAX 255

Definition at line 39 of file btrfs.h.

◆ ROOT_DIR_WORD

#define ROOT_DIR_WORD 0x002f

Definition at line 85 of file btrfs.h.

Typedef Documentation

◆ __u16

typedef u16 __u16

Definition at line 18 of file btrfs.h.

◆ __u32

typedef u32 __u32

Definition at line 19 of file btrfs.h.

◆ __u64

typedef u64 __u64

Definition at line 20 of file btrfs.h.

◆ __u8

typedef u8 __u8

Definition at line 17 of file btrfs.h.

◆ pbtrfs_file_info

typedef struct btrfs_file_info * pbtrfs_file_info

◆ PBTRFS_INFO

typedef struct _BTRFS_INFO* PBTRFS_INFO

Definition at line 413 of file btrfs.h.

◆ u16

typedef USHORT u16

Definition at line 13 of file btrfs.h.

◆ u32

typedef ULONG32 u32

Definition at line 14 of file btrfs.h.

◆ u64

typedef ULONG64 u64

Definition at line 15 of file btrfs.h.

◆ u8

typedef UCHAR u8

Definition at line 12 of file btrfs.h.

Function Documentation

◆ BtrFsGetVolumeSize()

ULONGLONG BtrFsGetVolumeSize ( _In_ ULONG DeviceId )

Returns the size of the BTRFS volume laid on the storage media device opened via DeviceId.

Definition at line 1342 of file btrfs.c.

{
    PBTRFS_INFO Volume = BtrFsVolumes[DeviceId];
    ASSERT(Volume);
 
    /* NOTE: BytesPerSector is given by Volume->SuperBlock.sectorsize */
    return Volume->SuperBlock.total_bytes;
}

Referenced by FsGetVolumeSize().

◆ BtrFsMount()

const DEVVTBL * BtrFsMount ( ULONG DeviceId )

Definition at line 1363 of file btrfs.c.

{
    PBTRFS_INFO BtrFsInfo;
    struct btrfs_path path;
    struct btrfs_root_item fs_root_item;
 
    TRACE("Enter BtrFsMount(%lu)\n", DeviceId);
 
    BtrFsInfo = FrLdrTempAlloc(sizeof(BTRFS_INFO), TAG_BTRFS_INFO);
    if (!BtrFsInfo)
        return NULL;
    RtlZeroMemory(BtrFsInfo, sizeof(BTRFS_INFO));
 
    /* Read the SuperBlock */
    if (!disk_read(DeviceId, BTRFS_SUPER_INFO_OFFSET,
                   &BtrFsInfo->SuperBlock, sizeof(BtrFsInfo->SuperBlock)))
    {
        FrLdrTempFree(BtrFsInfo, TAG_BTRFS_INFO);
        return NULL;
    }
 
    /* Check if SuperBlock is valid. If yes, return BTRFS function table */
    if (BtrFsInfo->SuperBlock.magic != BTRFS_MAGIC_N)
    {
        FrLdrTempFree(BtrFsInfo, TAG_BTRFS_INFO);
        return NULL;
    }
 
    BtrFsInfo->DeviceId = DeviceId;
    TRACE("BtrFsMount(%lu) superblock magic ok\n", DeviceId);
 
    btrfs_init_crc32c();
 
    btrfs_read_sys_chunk_array(BtrFsInfo);
    btrfs_read_chunk_tree(BtrFsInfo);
 
    /* setup roots */
    fs_root_item.bytenr = BtrFsInfo->SuperBlock.root;
    fs_root_item.level = BtrFsInfo->SuperBlock.root_level;
 
    init_path(&BtrFsInfo->SuperBlock, &path);
    if (!BtrFsSearchTreeType(BtrFsInfo, &fs_root_item, BTRFS_FS_TREE_OBJECTID, BTRFS_ROOT_ITEM_KEY, &path))
    {
        free_path(&path);
        FrLdrTempFree(BtrFsInfo, TAG_BTRFS_INFO);
        return NULL;
    }
 
    BtrFsInfo->FsRoot = *(struct btrfs_root_item *) path_current_data(&path);
 
    free_path(&path);
 
    /* Remember BTRFS volume information */
    BtrFsVolumes[DeviceId] = BtrFsInfo;
 
    TRACE("BtrFsMount(%lu) success\n", DeviceId);
    return &BtrFsFuncTable;
}

Classes

Macros

Typedefs

Functions