e2fsprogs-libs-1.41.12/lib/blkid/probe.h - nest-learning-thermostat/5.0.2/e2fsprogs - Git at Google

 /*
  * probe.h - constants and on-disk structures for extracting device data
  *
  * Copyright (C) 1999 by Andries Brouwer
  * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
  * Copyright (C) 2001 by Andreas Dilger
  *
  * %Begin-Header%
  * This file may be redistributed under the terms of the
  * GNU Lesser General Public License.
  * %End-Header%
  */

 #ifndef _BLKID_PROBE_H
 #define _BLKID_PROBE_H

 #include <blkid/blkid_types.h>

 struct blkid_magic;

 #define SB_BUFFER_SIZE		0x11000

 struct blkid_probe {
 	int			fd;
 	blkid_cache		cache;
 	blkid_dev		dev;
 	unsigned char		*sbbuf;
 	size_t			sb_valid;
 	unsigned char		*buf;
 	size_t			buf_max;
 };

 typedef int (*blkid_probe_t)(struct blkid_probe *probe,
 			     struct blkid_magic *id, unsigned char *buf);

 struct blkid_magic {
 	const char	*bim_type;	/* type name for this magic */
 	long		bim_kboff;	/* kilobyte offset of superblock */
 	unsigned	bim_sboff;	/* byte offset within superblock */
 	unsigned	bim_len;	/* length of magic */
 	const char	*bim_magic;	/* magic string */
 	blkid_probe_t	bim_probe;	/* probe function */
 };

 /*
  * Structures for each of the content types we want to extract information
  * from.  We do not necessarily need the magic field here, because we have
  * already identified the content type before we get this far.  It may still
  * be useful if there are probe functions which handle multiple content types.
  */
 struct ext2_super_block {
 	__u32		s_inodes_count;
 	__u32		s_blocks_count;
 	__u32		s_r_blocks_count;
 	__u32		s_free_blocks_count;
 	__u32		s_free_inodes_count;
 	__u32		s_first_data_block;
 	__u32		s_log_block_size;
 	__u32		s_dummy3[7];
 	unsigned char	s_magic[2];
 	__u16		s_state;
 	__u32		s_dummy5[8];
 	__u32		s_feature_compat;
 	__u32		s_feature_incompat;
 	__u32		s_feature_ro_compat;
 	unsigned char   s_uuid[16];
 	char	   s_volume_name[16];
 	char	s_last_mounted[64];
 	__u32	s_algorithm_usage_bitmap;
 	__u8	s_prealloc_blocks;
 	__u8	s_prealloc_dir_blocks;
 	__u16	s_reserved_gdt_blocks;
 	__u8	s_journal_uuid[16];
 	__u32	s_journal_inum;
 	__u32	s_journal_dev;
 	__u32	s_last_orphan;
 	__u32	s_hash_seed[4];
 	__u8	s_def_hash_version;
 	__u8	s_jnl_backup_type;
 	__u16	s_reserved_word_pad;
 	__u32	s_default_mount_opts;
 	__u32	s_first_meta_bg;
 	__u32	s_mkfs_time;
 	__u32	s_jnl_blocks[17];
 	__u32	s_blocks_count_hi;
 	__u32	s_r_blocks_count_hi;
 	__u32	s_free_blocks_hi;
 	__u16	s_min_extra_isize;
 	__u16	s_want_extra_isize;
 	__u32	s_flags;
 	__u16   s_raid_stride;
 	__u16   s_mmp_interval;
 	__u64   s_mmp_block;
 	__u32   s_raid_stripe_width;
 	__u32   s_reserved[163];
 };

 /* for s_flags */
 #define EXT2_FLAGS_TEST_FILESYS		0x0004

 /* for s_feature_compat */
 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL		0x0004

 /* for s_feature_ro_compat */
 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER	0x0001
 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE	0x0002
 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR	0x0004
 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE	0x0008
 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM		0x0010
 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK	0x0020
 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE	0x0040

 /* for s_feature_incompat */
 #define EXT2_FEATURE_INCOMPAT_FILETYPE		0x0002
 #define EXT3_FEATURE_INCOMPAT_RECOVER		0x0004
 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV	0x0008
 #define EXT2_FEATURE_INCOMPAT_META_BG		0x0010
 #define EXT4_FEATURE_INCOMPAT_EXTENTS		0x0040 /* extents support */
 #define EXT4_FEATURE_INCOMPAT_64BIT		0x0080
 #define EXT4_FEATURE_INCOMPAT_MMP		0x0100
 #define EXT4_FEATURE_INCOMPAT_FLEX_BG		0x0200

 #define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 					 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 					 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
 #define EXT2_FEATURE_INCOMPAT_SUPP	(EXT2_FEATURE_INCOMPAT_FILETYPE| \
 					 EXT2_FEATURE_INCOMPAT_META_BG)
 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED	~EXT2_FEATURE_INCOMPAT_SUPP
 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED	~EXT2_FEATURE_RO_COMPAT_SUPP

 #define EXT3_FEATURE_RO_COMPAT_SUPP	(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 					 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 					 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
 #define EXT3_FEATURE_INCOMPAT_SUPP	(EXT2_FEATURE_INCOMPAT_FILETYPE| \
 					 EXT3_FEATURE_INCOMPAT_RECOVER| \
 					 EXT2_FEATURE_INCOMPAT_META_BG)
 #define EXT3_FEATURE_INCOMPAT_UNSUPPORTED	~EXT3_FEATURE_INCOMPAT_SUPP
 #define EXT3_FEATURE_RO_COMPAT_UNSUPPORTED	~EXT3_FEATURE_RO_COMPAT_SUPP


 struct xfs_super_block {
 	unsigned char	xs_magic[4];
 	__u32		xs_blocksize;
 	__u64		xs_dblocks;
 	__u64		xs_rblocks;
 	__u32		xs_dummy1[2];
 	unsigned char	xs_uuid[16];
 	__u32		xs_dummy2[15];
 	char		xs_fname[12];
 	__u32		xs_dummy3[2];
 	__u64		xs_icount;
 	__u64		xs_ifree;
 	__u64		xs_fdblocks;
 };

 struct reiserfs_super_block {
 	__u32		rs_blocks_count;
 	__u32		rs_free_blocks;
 	__u32		rs_root_block;
 	__u32		rs_journal_block;
 	__u32		rs_journal_dev;
 	__u32		rs_orig_journal_size;
 	__u32		rs_dummy2[5];
 	__u16		rs_blocksize;
 	__u16		rs_dummy3[3];
 	unsigned char	rs_magic[12];
 	__u32		rs_dummy4[5];
 	unsigned char	rs_uuid[16];
 	char		rs_label[16];
 };

 struct reiser4_super_block {
 	unsigned char	rs4_magic[16];
 	__u16		rs4_dummy[2];
 	unsigned char	rs4_uuid[16];
 	unsigned char	rs4_label[16];
 	__u64		rs4_dummy2;
 };

 struct jfs_super_block {
 	unsigned char	js_magic[4];
 	__u32		js_version;
 	__u64		js_size;
 	__u32		js_bsize;	/* 4: aggregate block size in bytes */
 	__u16		js_l2bsize;	/* 2: log2 of s_bsize */
 	__u16		js_l2bfactor;	/* 2: log2(s_bsize/hardware block size) */
 	__u32		js_pbsize;	/* 4: hardware/LVM block size in bytes */
 	__u16		js_l2pbsize;	/* 2: log2 of s_pbsize */
 	__u16 		js_pad;		/* 2: padding necessary for alignment */
 	__u32		js_dummy2[26];
 	unsigned char	js_uuid[16];
 	unsigned char	js_label[16];
 	unsigned char	js_loguuid[16];
 };

 struct romfs_super_block {
 	unsigned char	ros_magic[8];
 	__u32		ros_dummy1[2];
 	unsigned char	ros_volume[16];
 };

 struct cramfs_super_block {
 	__u8		magic[4];
 	__u32		size;
 	__u32		flags;
 	__u32		future;
 	__u8		signature[16];
 	struct cramfs_info {
 		__u32		crc;
 		__u32		edition;
 		__u32		blocks;
 		__u32		files;
 	} info;
 	__u8		name[16];
 };

 struct swap_id_block {
 /*	unsigned char	sws_boot[1024]; */
 	__u32		sws_version;
 	__u32		sws_lastpage;
 	__u32		sws_nrbad;
 	unsigned char	sws_uuid[16];
 	char		sws_volume[16];
 	unsigned char	sws_pad[117];
 	__u32		sws_badpg;
 };

 /* Yucky misaligned values */
 struct vfat_super_block {
 /* 00*/	unsigned char	vs_ignored[3];
 /* 03*/	unsigned char	vs_sysid[8];
 /* 0b*/	unsigned char	vs_sector_size[2];
 /* 0d*/	__u8		vs_cluster_size;
 /* 0e*/	__u16		vs_reserved;
 /* 10*/	__u8		vs_fats;
 /* 11*/	unsigned char	vs_dir_entries[2];
 /* 13*/	unsigned char	vs_sectors[2];
 /* 15*/	unsigned char	vs_media;
 /* 16*/	__u16		vs_fat_length;
 /* 18*/	__u16		vs_secs_track;
 /* 1a*/	__u16		vs_heads;
 /* 1c*/	__u32		vs_hidden;
 /* 20*/	__u32		vs_total_sect;
 /* 24*/	__u32		vs_fat32_length;
 /* 28*/	__u16		vs_flags;
 /* 2a*/	__u8		vs_version[2];
 /* 2c*/	__u32		vs_root_cluster;
 /* 30*/	__u16		vs_insfo_sector;
 /* 32*/	__u16		vs_backup_boot;
 /* 34*/	__u16		vs_reserved2[6];
 /* 40*/	unsigned char	vs_unknown[3];
 /* 43*/	unsigned char	vs_serno[4];
 /* 47*/	unsigned char	vs_label[11];
 /* 52*/	unsigned char   vs_magic[8];
 /* 5a*/	unsigned char	vs_dummy2[164];
 /*1fe*/	unsigned char	vs_pmagic[2];
 };

 /* Yucky misaligned values */
 struct msdos_super_block {
 /* 00*/	unsigned char	ms_ignored[3];
 /* 03*/	unsigned char	ms_sysid[8];
 /* 0b*/	unsigned char	ms_sector_size[2];
 /* 0d*/	__u8		ms_cluster_size;
 /* 0e*/	__u16		ms_reserved;
 /* 10*/	__u8		ms_fats;
 /* 11*/	unsigned char	ms_dir_entries[2];
 /* 13*/	unsigned char	ms_sectors[2];
 /* 15*/	unsigned char	ms_media;
 /* 16*/	__u16		ms_fat_length;
 /* 18*/	__u16		ms_secs_track;
 /* 1a*/	__u16		ms_heads;
 /* 1c*/	__u32		ms_hidden;
 /* 20*/	__u32		ms_total_sect;
 /* 24*/	unsigned char	ms_unknown[3];
 /* 27*/	unsigned char	ms_serno[4];
 /* 2b*/	unsigned char	ms_label[11];
 /* 36*/	unsigned char   ms_magic[8];
 /* 3d*/	unsigned char	ms_dummy2[192];
 /*1fe*/	unsigned char	ms_pmagic[2];
 };

 struct vfat_dir_entry {
 	__u8	name[11];
 	__u8	attr;
 	__u16	time_creat;
 	__u16	date_creat;
 	__u16	time_acc;
 	__u16	date_acc;
 	__u16	cluster_high;
 	__u16	time_write;
 	__u16	date_write;
 	__u16	cluster_low;
 	__u32	size;
 };

 /* maximum number of clusters */
 #define FAT12_MAX 0xFF4
 #define FAT16_MAX 0xFFF4
 #define FAT32_MAX 0x0FFFFFF6

 struct minix_super_block {
 	__u16		ms_ninodes;
 	__u16		ms_nzones;
 	__u16		ms_imap_blocks;
 	__u16		ms_zmap_blocks;
 	__u16		ms_firstdatazone;
 	__u16		ms_log_zone_size;
 	__u32		ms_max_size;
 	unsigned char	ms_magic[2];
 	__u16		ms_state;
 	__u32		ms_zones;
 };

 struct mdp_superblock_s {
 	__u32 md_magic;
 	__u32 major_version;
 	__u32 minor_version;
 	__u32 patch_version;
 	__u32 gvalid_words;
 	__u32 set_uuid0;
 	__u32 ctime;
 	__u32 level;
 	__u32 size;
 	__u32 nr_disks;
 	__u32 raid_disks;
 	__u32 md_minor;
 	__u32 not_persistent;
 	__u32 set_uuid1;
 	__u32 set_uuid2;
 	__u32 set_uuid3;
 };

 struct hfs_super_block {
 	char	h_magic[2];
 	char	h_dummy[18];
 	__u32	h_blksize;
 };

 struct ocfs_volume_header {
 	unsigned char	minor_version[4];
 	unsigned char	major_version[4];
 	unsigned char	signature[128];
 	char		mount[128];
 	unsigned char   mount_len[2];
 };

 struct ocfs_volume_label {
 	unsigned char	disk_lock[48];
 	char		label[64];
 	unsigned char	label_len[2];
 	unsigned char  vol_id[16];
 	unsigned char  vol_id_len[2];
 };

 #define ocfsmajor(o) ((__u32)o.major_version[0] \
                    + (((__u32) o.major_version[1]) << 8) \
                    + (((__u32) o.major_version[2]) << 16) \
                    + (((__u32) o.major_version[3]) << 24))
 #define ocfslabellen(o)	((__u32)o.label_len[0] + (((__u32) o.label_len[1]) << 8))
 #define ocfsmountlen(o)	((__u32)o.mount_len[0] + (((__u32) o.mount_len[1])<<8))

 #define OCFS_MAGIC "OracleCFS"

 struct ocfs2_super_block {
 	unsigned char  signature[8];
 	unsigned char  s_dummy1[184];
 	unsigned char  s_dummy2[80];
 	char	       s_label[64];
 	unsigned char  s_uuid[16];
 };

 #define OCFS2_MIN_BLOCKSIZE             512
 #define OCFS2_MAX_BLOCKSIZE             4096

 #define OCFS2_SUPER_BLOCK_BLKNO         2

 #define OCFS2_SUPER_BLOCK_SIGNATURE     "OCFSV2"

 struct oracle_asm_disk_label {
 	char dummy[32];
 	char dl_tag[8];
 	char dl_id[24];
 };

 #define ORACLE_ASM_DISK_LABEL_MARKED    "ORCLDISK"
 #define ORACLE_ASM_DISK_LABEL_OFFSET    32

 struct iso_volume_descriptor {
 	unsigned char	vd_type;
 	unsigned char	vd_id[5];
 	unsigned char	vd_version;
 	unsigned char	flags;
 	unsigned char	system_id[32];
 	unsigned char	volume_id[32];
 	unsigned char	unused[8];
 	unsigned char	space_size[8];
 	unsigned char	escape_sequences[8];
 };

 /* Common gfs/gfs2 constants: */
 #define GFS_MAGIC               0x01161970
 #define GFS_DEFAULT_BSIZE       4096
 #define GFS_SUPERBLOCK_OFFSET	(0x10 * GFS_DEFAULT_BSIZE)
 #define GFS_METATYPE_SB         1
 #define GFS_FORMAT_SB           100
 #define GFS_LOCKNAME_LEN        64

 /* gfs1 constants: */
 #define GFS_FORMAT_FS           1309
 #define GFS_FORMAT_MULTI        1401
 /* gfs2 constants: */
 #define GFS2_FORMAT_FS          1801
 #define GFS2_FORMAT_MULTI       1900

 struct gfs2_meta_header {
 	__u32 mh_magic;
 	__u32 mh_type;
 	__u64 __pad0;          /* Was generation number in gfs1 */
 	__u32 mh_format;
 	__u32 __pad1;          /* Was incarnation number in gfs1 */
 };

 struct gfs2_inum {
 	__u64 no_formal_ino;
 	__u64 no_addr;
 };

 struct gfs2_sb {
 	struct gfs2_meta_header sb_header;

 	__u32 sb_fs_format;
 	__u32 sb_multihost_format;
 	__u32  __pad0;  /* Was superblock flags in gfs1 */

 	__u32 sb_bsize;
 	__u32 sb_bsize_shift;
 	__u32 __pad1;   /* Was journal segment size in gfs1 */

 	struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
 	struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
 	struct gfs2_inum sb_root_dir;

 	char sb_lockproto[GFS_LOCKNAME_LEN];
 	char sb_locktable[GFS_LOCKNAME_LEN];
 	/* In gfs1, quota and license dinodes followed */
 };

 struct ntfs_super_block {
 	__u8	jump[3];
 	__u8	oem_id[8];
 	__u8	bios_parameter_block[25];
 	__u16	unused[2];
 	__u64	number_of_sectors;
 	__u64	mft_cluster_location;
 	__u64	mft_mirror_cluster_location;
 	__s8	cluster_per_mft_record;
 	__u8	reserved1[3];
 	__s8	cluster_per_index_record;
 	__u8	reserved2[3];
 	__u64	volume_serial;
 	__u16	checksum;
 };

 struct master_file_table_record {
 	__u32	magic;
 	__u16	usa_ofs;
 	__u16	usa_count;
 	__u64	lsn;
 	__u16	sequence_number;
 	__u16	link_count;
 	__u16	attrs_offset;
 	__u16	flags;
 	__u32	bytes_in_use;
 	__u32	bytes_allocated;
 } __attribute__((__packed__));

 struct file_attribute {
 	__u32	type;
 	__u32	len;
 	__u8	non_resident;
 	__u8	name_len;
 	__u16	name_offset;
 	__u16	flags;
 	__u16	instance;
 	__u32	value_len;
 	__u16	value_offset;
 } __attribute__((__packed__));

 #define MFT_RECORD_VOLUME			3
 #define MFT_RECORD_ATTR_VOLUME_NAME		0x60
 #define MFT_RECORD_ATTR_VOLUME_INFO		0x70
 #define MFT_RECORD_ATTR_OBJECT_ID		0x40
 #define MFT_RECORD_ATTR_END			0xffffffffu

 /* HFS / HFS+ */
 struct hfs_finder_info {
         __u32        boot_folder;
         __u32        start_app;
         __u32        open_folder;
         __u32        os9_folder;
         __u32        reserved;
         __u32        osx_folder;
         __u8         id[8];
 } __attribute__((packed));

 struct hfs_mdb {
         __u8         signature[2];
         __u32        cr_date;
         __u32        ls_Mod;
         __u16        atrb;
         __u16        nm_fls;
         __u16        vbm_st;
         __u16        alloc_ptr;
         __u16        nm_al_blks;
         __u32        al_blk_size;
         __u32        clp_size;
         __u16        al_bl_st;
         __u32        nxt_cnid;
         __u16        free_bks;
         __u8         label_len;
         __u8         label[27];
         __u32        vol_bkup;
         __u16        vol_seq_num;
         __u32        wr_cnt;
         __u32        xt_clump_size;
         __u32        ct_clump_size;
         __u16        num_root_dirs;
         __u32        file_count;
         __u32        dir_count;
         struct hfs_finder_info finder_info;
         __u8         embed_sig[2];
         __u16        embed_startblock;
         __u16        embed_blockcount;
 } __attribute__((packed));


 #define HFS_NODE_LEAF			0xff
 #define HFSPLUS_POR_CNID		1

 struct hfsplus_bnode_descriptor {
 	__u32		next;
 	__u32		prev;
 	__u8		type;
 	__u8		height;
 	__u16		num_recs;
 	__u16		reserved;
 } __attribute__((packed));

 struct hfsplus_bheader_record {
 	__u16		depth;
 	__u32		root;
 	__u32		leaf_count;
 	__u32		leaf_head;
 	__u32		leaf_tail;
 	__u16		node_size;
 } __attribute__((packed));

 struct hfsplus_catalog_key {
 	__u16	key_len;
 	__u32	parent_id;
 	__u16	unicode_len;
 	__u8		unicode[255 * 2];
 } __attribute__((packed));

 struct hfsplus_extent {
 	__u32		start_block;
 	__u32		block_count;
 } __attribute__((packed));

 #define HFSPLUS_EXTENT_COUNT		8
 struct hfsplus_fork {
 	__u64		total_size;
 	__u32		clump_size;
 	__u32		total_blocks;
 	struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
 } __attribute__((packed));

 struct hfsplus_vol_header {
 	__u8		signature[2];
 	__u16		version;
 	__u32		attributes;
 	__u32		last_mount_vers;
 	__u32		reserved;
 	__u32		create_date;
 	__u32		modify_date;
 	__u32		backup_date;
 	__u32		checked_date;
 	__u32		file_count;
 	__u32		folder_count;
 	__u32		blocksize;
 	__u32		total_blocks;
 	__u32		free_blocks;
 	__u32		next_alloc;
 	__u32		rsrc_clump_sz;
 	__u32		data_clump_sz;
 	__u32		next_cnid;
 	__u32		write_count;
 	__u64		encodings_bmp;
 	struct hfs_finder_info finder_info;
 	struct hfsplus_fork alloc_file;
 	struct hfsplus_fork ext_file;
 	struct hfsplus_fork cat_file;
 	struct hfsplus_fork attr_file;
 	struct hfsplus_fork start_file;
 }  __attribute__((packed));


 /* this is lvm's label_header & pv_header combined. */

 #define LVM2_ID_LEN 32

 struct lvm2_pv_label_header {
 	/* label_header */
 	__u8	id[8];		/* LABELONE */
 	__u64	sector_xl;	/* Sector number of this label */
 	__u32	crc_xl;		/* From next field to end of sector */
 	__u32	offset_xl;	/* Offset from start of struct to contents */
 	__u8	type[8];	/* LVM2 001 */
 	/* pv_header */
 	__u8	pv_uuid[LVM2_ID_LEN];
 } __attribute__ ((packed));


 /*
  * this is a very generous portion of the super block, giving us
  * room to translate 14 chunks with 3 stripes each.
  */
 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
 #define BTRFS_LABEL_SIZE 256
 #define BTRFS_UUID_SIZE 16
 #define BTRFS_FSID_SIZE 16
 #define BTRFS_CSUM_SIZE 32

 struct btrfs_dev_item {
 	/* the internal btrfs device id */
 	__u64 devid;

 	/* size of the device */
 	__u64 total_bytes;

 	/* bytes used */
 	__u64 bytes_used;

 	/* optimal io alignment for this device */
 	__u32 io_align;

 	/* optimal io width for this device */
 	__u32 io_width;

 	/* minimal io size for this device */
 	__u32 sector_size;

 	/* type and info about this device */
 	__u64 type;

 	/* expected generation for this device */
 	__u64 generation;

 	/*
 	 * starting byte of this partition on the device,
 	 * to allowr for stripe alignment in the future
 	 */
 	__u64 start_offset;

 	/* grouping information for allocation decisions */
 	__u32 dev_group;

 	/* seek speed 0-100 where 100 is fastest */
 	__u8 seek_speed;

 	/* bandwidth 0-100 where 100 is fastest */
 	__u8 bandwidth;

 	/* btrfs generated uuid for this device */
 	__u8 uuid[BTRFS_UUID_SIZE];

 	/* uuid of FS who owns this device */
 	__u8 fsid[BTRFS_UUID_SIZE];
 } __attribute__ ((__packed__));

 /*
  * the super block basically lists the main trees of the FS
  * it currently lacks any block count etc etc
  */
 struct btrfs_super_block {
 	__u8 csum[BTRFS_CSUM_SIZE];
 	/* the first 3 fields must match struct btrfs_header */
 	__u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
 	__u64 bytenr; /* this block number */
 	__u64 flags;

 	/* allowed to be different from the btrfs_header from here own down */
 	__u64 magic;
 	__u64 generation;
 	__u64 root;
 	__u64 chunk_root;
 	__u64 log_root;

 	/* this will help find the new super based on the log root */
 	__u64 log_root_transid;
 	__u64 total_bytes;
 	__u64 bytes_used;
 	__u64 root_dir_objectid;
 	__u64 num_devices;
 	__u32 sectorsize;
 	__u32 nodesize;
 	__u32 leafsize;
 	__u32 stripesize;
 	__u32 sys_chunk_array_size;
 	__u64 chunk_root_generation;
 	__u64 compat_flags;
 	__u64 compat_ro_flags;
 	__u64 incompat_flags;
 	__u16 csum_type;
 	__u8 root_level;
 	__u8 chunk_root_level;
 	__u8 log_root_level;
 	struct btrfs_dev_item dev_item;

 	char label[BTRFS_LABEL_SIZE];

 	/* future expansion */
 	__u64 reserved[32];
 	__u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
 } __attribute__ ((__packed__));

 /*
  * Byte swap functions
  */
 #ifdef __GNUC__
 #define _INLINE_ static __inline__
 #else				/* For Watcom C */
 #define _INLINE_ static inline
 #endif

 static __u16 blkid_swab16(__u16 val);
 static __u32 blkid_swab32(__u32 val);
 static __u64 blkid_swab64(__u64 val);

 #if ((defined __GNUC__) && \
      (defined(__i386__) || defined(__i486__) || defined(__i586__)))

 #define _BLKID_HAVE_ASM_BITOPS_

 _INLINE_ __u32 blkid_swab32(__u32 val)
 {
 #ifdef EXT2FS_REQUIRE_486
 	__asm__("bswap %0" : "=r" (val) : "0" (val));
 #else
 	__asm__("xchgb %b0,%h0\n\t"	/* swap lower bytes	*/
 		"rorl $16,%0\n\t"	/* swap words		*/
 		"xchgb %b0,%h0"		/* swap higher bytes	*/
 		:"=q" (val)
 		: "0" (val));
 #endif
 	return val;
 }

 _INLINE_ __u16 blkid_swab16(__u16 val)
 {
 	__asm__("xchgb %b0,%h0"		/* swap bytes		*/ \
 		: "=q" (val) \
 		:  "0" (val)); \
 		return val;
 }

 _INLINE_ __u64 blkid_swab64(__u64 val)
 {
 	return (blkid_swab32(val >> 32) |
 		(((__u64) blkid_swab32(val & 0xFFFFFFFFUL)) << 32));
 }
 #endif

 #if !defined(_BLKID_HAVE_ASM_BITOPS_)

 _INLINE_  __u16 blkid_swab16(__u16 val)
 {
 	return (val >> 8) | (val << 8);
 }

 _INLINE_ __u32 blkid_swab32(__u32 val)
 {
 	return ((val>>24) | ((val>>8)&0xFF00) |
 		((val<<8)&0xFF0000) | (val<<24));
 }

 _INLINE_ __u64 blkid_swab64(__u64 val)
 {
 	return (blkid_swab32(val >> 32) |
 		(((__u64) blkid_swab32(val & 0xFFFFFFFFUL)) << 32));
 }
 #endif


 #ifdef WORDS_BIGENDIAN
 #define blkid_le16(x) blkid_swab16(x)
 #define blkid_le32(x) blkid_swab32(x)
 #define blkid_le64(x) blkid_swab64(x)
 #define blkid_be16(x) (x)
 #define blkid_be32(x) (x)
 #define blkid_be64(x) (x)
 #else
 #define blkid_le16(x) (x)
 #define blkid_le32(x) (x)
 #define blkid_le64(x) (x)
 #define blkid_be16(x) blkid_swab16(x)
 #define blkid_be32(x) blkid_swab32(x)
 #define blkid_be64(x) blkid_swab64(x)
 #endif

 #undef _INLINE_

 #endif /* _BLKID_PROBE_H */
	/*
	* probe.h - constants and on-disk structures for extracting device data
	*
	* Copyright (C) 1999 by Andries Brouwer
	* Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
	* Copyright (C) 2001 by Andreas Dilger
	*
	* %Begin-Header%
	* This file may be redistributed under the terms of the
	* GNU Lesser General Public License.
	* %End-Header%
	*/

	#ifndef _BLKID_PROBE_H
	#define _BLKID_PROBE_H

	#include <blkid/blkid_types.h>

	struct blkid_magic;

	#define SB_BUFFER_SIZE 0x11000

	struct blkid_probe {
	int fd;
	blkid_cache cache;
	blkid_dev dev;
	unsigned char *sbbuf;
	size_t sb_valid;
	unsigned char *buf;
	size_t buf_max;
	};

	typedef int (blkid_probe_t)(struct blkid_probe probe,
	struct blkid_magic id, unsigned char buf);

	struct blkid_magic {
	const char bim_type; / type name for this magic */
	long bim_kboff; /* kilobyte offset of superblock */
	unsigned bim_sboff; /* byte offset within superblock */
	unsigned bim_len; /* length of magic */
	const char bim_magic; / magic string */
	blkid_probe_t bim_probe; /* probe function */
	};

	/*
	* Structures for each of the content types we want to extract information
	* from. We do not necessarily need the magic field here, because we have
	* already identified the content type before we get this far. It may still
	* be useful if there are probe functions which handle multiple content types.
	*/
	struct ext2_super_block {
	__u32 s_inodes_count;
	__u32 s_blocks_count;
	__u32 s_r_blocks_count;
	__u32 s_free_blocks_count;
	__u32 s_free_inodes_count;
	__u32 s_first_data_block;
	__u32 s_log_block_size;
	__u32 s_dummy3[7];
	unsigned char s_magic[2];
	__u16 s_state;
	__u32 s_dummy5[8];
	__u32 s_feature_compat;
	__u32 s_feature_incompat;
	__u32 s_feature_ro_compat;
	unsigned char s_uuid[16];
	char s_volume_name[16];
	char s_last_mounted[64];
	__u32 s_algorithm_usage_bitmap;
	__u8 s_prealloc_blocks;
	__u8 s_prealloc_dir_blocks;
	__u16 s_reserved_gdt_blocks;
	__u8 s_journal_uuid[16];
	__u32 s_journal_inum;
	__u32 s_journal_dev;
	__u32 s_last_orphan;
	__u32 s_hash_seed[4];
	__u8 s_def_hash_version;
	__u8 s_jnl_backup_type;
	__u16 s_reserved_word_pad;
	__u32 s_default_mount_opts;
	__u32 s_first_meta_bg;
	__u32 s_mkfs_time;
	__u32 s_jnl_blocks[17];
	__u32 s_blocks_count_hi;
	__u32 s_r_blocks_count_hi;
	__u32 s_free_blocks_hi;
	__u16 s_min_extra_isize;
	__u16 s_want_extra_isize;
	__u32 s_flags;
	__u16 s_raid_stride;
	__u16 s_mmp_interval;
	__u64 s_mmp_block;
	__u32 s_raid_stripe_width;
	__u32 s_reserved[163];
	};

	/* for s_flags */
	#define EXT2_FLAGS_TEST_FILESYS 0x0004

	/* for s_feature_compat */
	#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004

	/* for s_feature_ro_compat */
	#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
	#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
	#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
	#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
	#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
	#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
	#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040

	/* for s_feature_incompat */
	#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
	#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
	#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
	#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
	#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
	#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
	#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
	#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200

	#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER\| \
	EXT2_FEATURE_RO_COMPAT_LARGE_FILE\| \
	EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
	#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE\| \
	EXT2_FEATURE_INCOMPAT_META_BG)
	#define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP
	#define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP

	#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER\| \
	EXT2_FEATURE_RO_COMPAT_LARGE_FILE\| \
	EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
	#define EXT3_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE\| \
	EXT3_FEATURE_INCOMPAT_RECOVER\| \
	EXT2_FEATURE_INCOMPAT_META_BG)
	#define EXT3_FEATURE_INCOMPAT_UNSUPPORTED ~EXT3_FEATURE_INCOMPAT_SUPP
	#define EXT3_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT3_FEATURE_RO_COMPAT_SUPP


	struct xfs_super_block {
	unsigned char xs_magic[4];
	__u32 xs_blocksize;
	__u64 xs_dblocks;
	__u64 xs_rblocks;
	__u32 xs_dummy1[2];
	unsigned char xs_uuid[16];
	__u32 xs_dummy2[15];
	char xs_fname[12];
	__u32 xs_dummy3[2];
	__u64 xs_icount;
	__u64 xs_ifree;
	__u64 xs_fdblocks;
	};

	struct reiserfs_super_block {
	__u32 rs_blocks_count;
	__u32 rs_free_blocks;
	__u32 rs_root_block;
	__u32 rs_journal_block;
	__u32 rs_journal_dev;
	__u32 rs_orig_journal_size;
	__u32 rs_dummy2[5];
	__u16 rs_blocksize;
	__u16 rs_dummy3[3];
	unsigned char rs_magic[12];
	__u32 rs_dummy4[5];
	unsigned char rs_uuid[16];
	char rs_label[16];
	};

	struct reiser4_super_block {
	unsigned char rs4_magic[16];
	__u16 rs4_dummy[2];
	unsigned char rs4_uuid[16];
	unsigned char rs4_label[16];
	__u64 rs4_dummy2;
	};

	struct jfs_super_block {
	unsigned char js_magic[4];
	__u32 js_version;
	__u64 js_size;
	__u32 js_bsize; /* 4: aggregate block size in bytes */
	__u16 js_l2bsize; /* 2: log2 of s_bsize */
	__u16 js_l2bfactor; /* 2: log2(s_bsize/hardware block size) */
	__u32 js_pbsize; /* 4: hardware/LVM block size in bytes */
	__u16 js_l2pbsize; /* 2: log2 of s_pbsize */
	__u16 js_pad; /* 2: padding necessary for alignment */
	__u32 js_dummy2[26];
	unsigned char js_uuid[16];
	unsigned char js_label[16];
	unsigned char js_loguuid[16];
	};

	struct romfs_super_block {
	unsigned char ros_magic[8];
	__u32 ros_dummy1[2];
	unsigned char ros_volume[16];
	};

	struct cramfs_super_block {
	__u8 magic[4];
	__u32 size;
	__u32 flags;
	__u32 future;
	__u8 signature[16];
	struct cramfs_info {
	__u32 crc;
	__u32 edition;
	__u32 blocks;
	__u32 files;
	} info;
	__u8 name[16];
	};

	struct swap_id_block {
	/* unsigned char sws_boot[1024]; */
	__u32 sws_version;
	__u32 sws_lastpage;
	__u32 sws_nrbad;
	unsigned char sws_uuid[16];
	char sws_volume[16];
	unsigned char sws_pad[117];
	__u32 sws_badpg;
	};

	/* Yucky misaligned values */
	struct vfat_super_block {
	/* 00*/ unsigned char vs_ignored[3];
	/* 03*/ unsigned char vs_sysid[8];
	/* 0b*/ unsigned char vs_sector_size[2];
	/* 0d*/ __u8 vs_cluster_size;
	/* 0e*/ __u16 vs_reserved;
	/* 10*/ __u8 vs_fats;
	/* 11*/ unsigned char vs_dir_entries[2];
	/* 13*/ unsigned char vs_sectors[2];
	/* 15*/ unsigned char vs_media;
	/* 16*/ __u16 vs_fat_length;
	/* 18*/ __u16 vs_secs_track;
	/* 1a*/ __u16 vs_heads;
	/* 1c*/ __u32 vs_hidden;
	/* 20*/ __u32 vs_total_sect;
	/* 24*/ __u32 vs_fat32_length;
	/* 28*/ __u16 vs_flags;
	/* 2a*/ __u8 vs_version[2];
	/* 2c*/ __u32 vs_root_cluster;
	/* 30*/ __u16 vs_insfo_sector;
	/* 32*/ __u16 vs_backup_boot;
	/* 34*/ __u16 vs_reserved2[6];
	/* 40*/ unsigned char vs_unknown[3];
	/* 43*/ unsigned char vs_serno[4];
	/* 47*/ unsigned char vs_label[11];
	/* 52*/ unsigned char vs_magic[8];
	/* 5a*/ unsigned char vs_dummy2[164];
	/1fe/ unsigned char vs_pmagic[2];
	};

	/* Yucky misaligned values */
	struct msdos_super_block {
	/* 00*/ unsigned char ms_ignored[3];
	/* 03*/ unsigned char ms_sysid[8];
	/* 0b*/ unsigned char ms_sector_size[2];
	/* 0d*/ __u8 ms_cluster_size;
	/* 0e*/ __u16 ms_reserved;
	/* 10*/ __u8 ms_fats;
	/* 11*/ unsigned char ms_dir_entries[2];
	/* 13*/ unsigned char ms_sectors[2];
	/* 15*/ unsigned char ms_media;
	/* 16*/ __u16 ms_fat_length;
	/* 18*/ __u16 ms_secs_track;
	/* 1a*/ __u16 ms_heads;
	/* 1c*/ __u32 ms_hidden;
	/* 20*/ __u32 ms_total_sect;
	/* 24*/ unsigned char ms_unknown[3];
	/* 27*/ unsigned char ms_serno[4];
	/* 2b*/ unsigned char ms_label[11];
	/* 36*/ unsigned char ms_magic[8];
	/* 3d*/ unsigned char ms_dummy2[192];
	/1fe/ unsigned char ms_pmagic[2];
	};

	struct vfat_dir_entry {
	__u8 name[11];
	__u8 attr;
	__u16 time_creat;
	__u16 date_creat;
	__u16 time_acc;
	__u16 date_acc;
	__u16 cluster_high;
	__u16 time_write;
	__u16 date_write;
	__u16 cluster_low;
	__u32 size;
	};

	/* maximum number of clusters */
	#define FAT12_MAX 0xFF4
	#define FAT16_MAX 0xFFF4
	#define FAT32_MAX 0x0FFFFFF6

	struct minix_super_block {
	__u16 ms_ninodes;
	__u16 ms_nzones;
	__u16 ms_imap_blocks;
	__u16 ms_zmap_blocks;
	__u16 ms_firstdatazone;
	__u16 ms_log_zone_size;
	__u32 ms_max_size;
	unsigned char ms_magic[2];
	__u16 ms_state;
	__u32 ms_zones;
	};

	struct mdp_superblock_s {
	__u32 md_magic;
	__u32 major_version;
	__u32 minor_version;
	__u32 patch_version;
	__u32 gvalid_words;
	__u32 set_uuid0;
	__u32 ctime;
	__u32 level;
	__u32 size;
	__u32 nr_disks;
	__u32 raid_disks;
	__u32 md_minor;
	__u32 not_persistent;
	__u32 set_uuid1;
	__u32 set_uuid2;
	__u32 set_uuid3;
	};

	struct hfs_super_block {
	char h_magic[2];
	char h_dummy[18];
	__u32 h_blksize;
	};

	struct ocfs_volume_header {
	unsigned char minor_version[4];
	unsigned char major_version[4];
	unsigned char signature[128];
	char mount[128];
	unsigned char mount_len[2];
	};

	struct ocfs_volume_label {
	unsigned char disk_lock[48];
	char label[64];
	unsigned char label_len[2];
	unsigned char vol_id[16];
	unsigned char vol_id_len[2];
	};

	#define ocfsmajor(o) ((__u32)o.major_version[0] \
	+ (((__u32) o.major_version[1]) << 8) \
	+ (((__u32) o.major_version[2]) << 16) \
	+ (((__u32) o.major_version[3]) << 24))
	#define ocfslabellen(o) ((__u32)o.label_len[0] + (((__u32) o.label_len[1]) << 8))
	#define ocfsmountlen(o) ((__u32)o.mount_len[0] + (((__u32) o.mount_len[1])<<8))

	#define OCFS_MAGIC "OracleCFS"

	struct ocfs2_super_block {
	unsigned char signature[8];
	unsigned char s_dummy1[184];
	unsigned char s_dummy2[80];
	char s_label[64];
	unsigned char s_uuid[16];
	};

	#define OCFS2_MIN_BLOCKSIZE 512
	#define OCFS2_MAX_BLOCKSIZE 4096

	#define OCFS2_SUPER_BLOCK_BLKNO 2

	#define OCFS2_SUPER_BLOCK_SIGNATURE "OCFSV2"

	struct oracle_asm_disk_label {
	char dummy[32];
	char dl_tag[8];
	char dl_id[24];
	};

	#define ORACLE_ASM_DISK_LABEL_MARKED "ORCLDISK"
	#define ORACLE_ASM_DISK_LABEL_OFFSET 32

	struct iso_volume_descriptor {
	unsigned char vd_type;
	unsigned char vd_id[5];
	unsigned char vd_version;
	unsigned char flags;
	unsigned char system_id[32];
	unsigned char volume_id[32];
	unsigned char unused[8];
	unsigned char space_size[8];
	unsigned char escape_sequences[8];
	};

	/* Common gfs/gfs2 constants: */
	#define GFS_MAGIC 0x01161970
	#define GFS_DEFAULT_BSIZE 4096
	#define GFS_SUPERBLOCK_OFFSET (0x10 * GFS_DEFAULT_BSIZE)
	#define GFS_METATYPE_SB 1
	#define GFS_FORMAT_SB 100
	#define GFS_LOCKNAME_LEN 64

	/* gfs1 constants: */
	#define GFS_FORMAT_FS 1309
	#define GFS_FORMAT_MULTI 1401
	/* gfs2 constants: */
	#define GFS2_FORMAT_FS 1801
	#define GFS2_FORMAT_MULTI 1900

	struct gfs2_meta_header {
	__u32 mh_magic;
	__u32 mh_type;
	__u64 __pad0; /* Was generation number in gfs1 */
	__u32 mh_format;
	__u32 __pad1; /* Was incarnation number in gfs1 */
	};

	struct gfs2_inum {
	__u64 no_formal_ino;
	__u64 no_addr;
	};

	struct gfs2_sb {
	struct gfs2_meta_header sb_header;

	__u32 sb_fs_format;
	__u32 sb_multihost_format;
	__u32 __pad0; /* Was superblock flags in gfs1 */

	__u32 sb_bsize;
	__u32 sb_bsize_shift;
	__u32 __pad1; /* Was journal segment size in gfs1 */

	struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
	struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
	struct gfs2_inum sb_root_dir;

	char sb_lockproto[GFS_LOCKNAME_LEN];
	char sb_locktable[GFS_LOCKNAME_LEN];
	/* In gfs1, quota and license dinodes followed */
	};

	struct ntfs_super_block {
	__u8 jump[3];
	__u8 oem_id[8];
	__u8 bios_parameter_block[25];
	__u16 unused[2];
	__u64 number_of_sectors;
	__u64 mft_cluster_location;
	__u64 mft_mirror_cluster_location;
	__s8 cluster_per_mft_record;
	__u8 reserved1[3];
	__s8 cluster_per_index_record;
	__u8 reserved2[3];
	__u64 volume_serial;
	__u16 checksum;
	};

	struct master_file_table_record {
	__u32 magic;
	__u16 usa_ofs;
	__u16 usa_count;
	__u64 lsn;
	__u16 sequence_number;
	__u16 link_count;
	__u16 attrs_offset;
	__u16 flags;
	__u32 bytes_in_use;
	__u32 bytes_allocated;
	} __attribute__((__packed__));

	struct file_attribute {
	__u32 type;
	__u32 len;
	__u8 non_resident;
	__u8 name_len;
	__u16 name_offset;
	__u16 flags;
	__u16 instance;
	__u32 value_len;
	__u16 value_offset;
	} __attribute__((__packed__));

	#define MFT_RECORD_VOLUME 3
	#define MFT_RECORD_ATTR_VOLUME_NAME 0x60
	#define MFT_RECORD_ATTR_VOLUME_INFO 0x70
	#define MFT_RECORD_ATTR_OBJECT_ID 0x40
	#define MFT_RECORD_ATTR_END 0xffffffffu

	/* HFS / HFS+ */
	struct hfs_finder_info {
	__u32 boot_folder;
	__u32 start_app;
	__u32 open_folder;
	__u32 os9_folder;
	__u32 reserved;
	__u32 osx_folder;
	__u8 id[8];
	} __attribute__((packed));

	struct hfs_mdb {
	__u8 signature[2];
	__u32 cr_date;
	__u32 ls_Mod;
	__u16 atrb;
	__u16 nm_fls;
	__u16 vbm_st;
	__u16 alloc_ptr;
	__u16 nm_al_blks;
	__u32 al_blk_size;
	__u32 clp_size;
	__u16 al_bl_st;
	__u32 nxt_cnid;
	__u16 free_bks;
	__u8 label_len;
	__u8 label[27];
	__u32 vol_bkup;
	__u16 vol_seq_num;
	__u32 wr_cnt;
	__u32 xt_clump_size;
	__u32 ct_clump_size;
	__u16 num_root_dirs;
	__u32 file_count;
	__u32 dir_count;
	struct hfs_finder_info finder_info;
	__u8 embed_sig[2];
	__u16 embed_startblock;
	__u16 embed_blockcount;
	} __attribute__((packed));


	#define HFS_NODE_LEAF 0xff
	#define HFSPLUS_POR_CNID 1

	struct hfsplus_bnode_descriptor {
	__u32 next;
	__u32 prev;
	__u8 type;
	__u8 height;
	__u16 num_recs;
	__u16 reserved;
	} __attribute__((packed));

	struct hfsplus_bheader_record {
	__u16 depth;
	__u32 root;
	__u32 leaf_count;
	__u32 leaf_head;
	__u32 leaf_tail;
	__u16 node_size;
	} __attribute__((packed));

	struct hfsplus_catalog_key {
	__u16 key_len;
	__u32 parent_id;
	__u16 unicode_len;
	__u8 unicode[255 * 2];
	} __attribute__((packed));

	struct hfsplus_extent {
	__u32 start_block;
	__u32 block_count;
	} __attribute__((packed));

	#define HFSPLUS_EXTENT_COUNT 8
	struct hfsplus_fork {
	__u64 total_size;
	__u32 clump_size;
	__u32 total_blocks;
	struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
	} __attribute__((packed));

	struct hfsplus_vol_header {
	__u8 signature[2];
	__u16 version;
	__u32 attributes;
	__u32 last_mount_vers;
	__u32 reserved;
	__u32 create_date;
	__u32 modify_date;
	__u32 backup_date;
	__u32 checked_date;
	__u32 file_count;
	__u32 folder_count;
	__u32 blocksize;
	__u32 total_blocks;
	__u32 free_blocks;
	__u32 next_alloc;
	__u32 rsrc_clump_sz;
	__u32 data_clump_sz;
	__u32 next_cnid;
	__u32 write_count;
	__u64 encodings_bmp;
	struct hfs_finder_info finder_info;
	struct hfsplus_fork alloc_file;
	struct hfsplus_fork ext_file;
	struct hfsplus_fork cat_file;
	struct hfsplus_fork attr_file;
	struct hfsplus_fork start_file;
	} __attribute__((packed));


	/* this is lvm's label_header & pv_header combined. */

	#define LVM2_ID_LEN 32

	struct lvm2_pv_label_header {
	/* label_header */
	__u8 id[8]; /* LABELONE */
	__u64 sector_xl; /* Sector number of this label */
	__u32 crc_xl; /* From next field to end of sector */
	__u32 offset_xl; /* Offset from start of struct to contents */
	__u8 type[8]; /* LVM2 001 */
	/* pv_header */
	__u8 pv_uuid[LVM2_ID_LEN];
	} __attribute__ ((packed));


	/*
	* this is a very generous portion of the super block, giving us
	* room to translate 14 chunks with 3 stripes each.
	*/
	#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
	#define BTRFS_LABEL_SIZE 256
	#define BTRFS_UUID_SIZE 16
	#define BTRFS_FSID_SIZE 16
	#define BTRFS_CSUM_SIZE 32

	struct btrfs_dev_item {
	/* the internal btrfs device id */
	__u64 devid;

	/* size of the device */
	__u64 total_bytes;

	/* bytes used */
	__u64 bytes_used;

	/* optimal io alignment for this device */
	__u32 io_align;

	/* optimal io width for this device */
	__u32 io_width;

	/* minimal io size for this device */
	__u32 sector_size;

	/* type and info about this device */
	__u64 type;

	/* expected generation for this device */
	__u64 generation;

	/*
	* starting byte of this partition on the device,
	* to allowr for stripe alignment in the future
	*/
	__u64 start_offset;

	/* grouping information for allocation decisions */
	__u32 dev_group;

	/* seek speed 0-100 where 100 is fastest */
	__u8 seek_speed;

	/* bandwidth 0-100 where 100 is fastest */
	__u8 bandwidth;

	/* btrfs generated uuid for this device */
	__u8 uuid[BTRFS_UUID_SIZE];

	/* uuid of FS who owns this device */
	__u8 fsid[BTRFS_UUID_SIZE];
	} __attribute__ ((__packed__));

	/*
	* the super block basically lists the main trees of the FS
	* it currently lacks any block count etc etc
	*/
	struct btrfs_super_block {
	__u8 csum[BTRFS_CSUM_SIZE];
	/* the first 3 fields must match struct btrfs_header */
	__u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
	__u64 bytenr; /* this block number */
	__u64 flags;

	/* allowed to be different from the btrfs_header from here own down */
	__u64 magic;
	__u64 generation;
	__u64 root;
	__u64 chunk_root;
	__u64 log_root;

	/* this will help find the new super based on the log root */
	__u64 log_root_transid;
	__u64 total_bytes;
	__u64 bytes_used;
	__u64 root_dir_objectid;
	__u64 num_devices;
	__u32 sectorsize;
	__u32 nodesize;
	__u32 leafsize;
	__u32 stripesize;
	__u32 sys_chunk_array_size;
	__u64 chunk_root_generation;
	__u64 compat_flags;
	__u64 compat_ro_flags;
	__u64 incompat_flags;
	__u16 csum_type;
	__u8 root_level;
	__u8 chunk_root_level;
	__u8 log_root_level;
	struct btrfs_dev_item dev_item;

	char label[BTRFS_LABEL_SIZE];

	/* future expansion */
	__u64 reserved[32];
	__u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
	} __attribute__ ((__packed__));

	/*
	* Byte swap functions
	*/
	#ifdef __GNUC__
	#define _INLINE_ static __inline__
	#else /* For Watcom C */
	#define _INLINE_ static inline
	#endif

	static __u16 blkid_swab16(__u16 val);
	static __u32 blkid_swab32(__u32 val);
	static __u64 blkid_swab64(__u64 val);

	#if ((defined __GNUC__) && \
	(defined(__i386__) \|\| defined(__i486__) \|\| defined(__i586__)))

	#define _BLKID_HAVE_ASM_BITOPS_

	_INLINE_ __u32 blkid_swab32(__u32 val)
	{
	#ifdef EXT2FS_REQUIRE_486
	__asm__("bswap %0" : "=r" (val) : "0" (val));
	#else
	__asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */
	"rorl $16,%0\n\t" /* swap words */
	"xchgb %b0,%h0" /* swap higher bytes */
	:"=q" (val)
	: "0" (val));
	#endif
	return val;
	}

	_INLINE_ __u16 blkid_swab16(__u16 val)
	{
	__asm__("xchgb %b0,%h0" /* swap bytes */ \
	: "=q" (val) \
	: "0" (val)); \
	return val;
	}

	_INLINE_ __u64 blkid_swab64(__u64 val)
	{
	return (blkid_swab32(val >> 32) \|
	(((__u64) blkid_swab32(val & 0xFFFFFFFFUL)) << 32));
	}
	#endif

	#if !defined(_BLKID_HAVE_ASM_BITOPS_)

	_INLINE_ __u16 blkid_swab16(__u16 val)
	{
	return (val >> 8) \| (val << 8);
	}

	_INLINE_ __u32 blkid_swab32(__u32 val)
	{
	return ((val>>24) \| ((val>>8)&0xFF00) \|
	((val<<8)&0xFF0000) \| (val<<24));
	}

	_INLINE_ __u64 blkid_swab64(__u64 val)
	{
	return (blkid_swab32(val >> 32) \|
	(((__u64) blkid_swab32(val & 0xFFFFFFFFUL)) << 32));
	}
	#endif



	#ifdef WORDS_BIGENDIAN
	#define blkid_le16(x) blkid_swab16(x)
	#define blkid_le32(x) blkid_swab32(x)
	#define blkid_le64(x) blkid_swab64(x)
	#define blkid_be16(x) (x)
	#define blkid_be32(x) (x)
	#define blkid_be64(x) (x)
	#else
	#define blkid_le16(x) (x)
	#define blkid_le32(x) (x)
	#define blkid_le64(x) (x)
	#define blkid_be16(x) blkid_swab16(x)
	#define blkid_be32(x) blkid_swab32(x)
	#define blkid_be64(x) blkid_swab64(x)
	#endif

	#undef _INLINE_

	#endif /* _BLKID_PROBE_H */