fs/squashfs/squashfs_fs.h - kernel/quantenna - Git at Google

 #ifndef SQUASHFS_FS
 #define SQUASHFS_FS
 /*
  * Squashfs
  *
  * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
  * Phillip Lougher <phillip@squashfs.org.uk>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version 2,
  * or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  *
  * squashfs_fs.h
  */

 #define SQUASHFS_CACHED_FRAGMENTS	CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
 #define SQUASHFS_MAJOR			4
 #define SQUASHFS_MINOR			0
 #define SQUASHFS_START			0

 /* size of metadata (inode and directory) blocks */
 #define SQUASHFS_METADATA_SIZE		8192

 /* default size of block device I/O */
 #ifdef CONFIG_SQUASHFS_4K_DEVBLK_SIZE
 #define SQUASHFS_DEVBLK_SIZE 4096
 #else
 #define SQUASHFS_DEVBLK_SIZE 1024
 #endif

 #define SQUASHFS_FILE_MAX_SIZE		1048576
 #define SQUASHFS_FILE_MAX_LOG		20

 /* Max length of filename (not 255) */
 #define SQUASHFS_NAME_LEN		256

 /* Max value for directory header count*/
 #define SQUASHFS_DIR_COUNT		256

 #define SQUASHFS_INVALID_FRAG		(0xffffffffU)
 #define SQUASHFS_INVALID_XATTR		(0xffffffffU)
 #define SQUASHFS_INVALID_BLK		(-1LL)

 /* Filesystem flags */
 #define SQUASHFS_NOI			0
 #define SQUASHFS_NOD			1
 #define SQUASHFS_NOF			3
 #define SQUASHFS_NO_FRAG		4
 #define SQUASHFS_ALWAYS_FRAG		5
 #define SQUASHFS_DUPLICATE		6
 #define SQUASHFS_EXPORT			7
 #define SQUASHFS_COMP_OPT		10

 #define SQUASHFS_BIT(flag, bit)		((flag >> bit) & 1)

 #define SQUASHFS_UNCOMPRESSED_INODES(flags)	SQUASHFS_BIT(flags, \
 						SQUASHFS_NOI)

 #define SQUASHFS_UNCOMPRESSED_DATA(flags)	SQUASHFS_BIT(flags, \
 						SQUASHFS_NOD)

 #define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags)	SQUASHFS_BIT(flags, \
 						SQUASHFS_NOF)

 #define SQUASHFS_NO_FRAGMENTS(flags)		SQUASHFS_BIT(flags, \
 						SQUASHFS_NO_FRAG)

 #define SQUASHFS_ALWAYS_FRAGMENTS(flags)	SQUASHFS_BIT(flags, \
 						SQUASHFS_ALWAYS_FRAG)

 #define SQUASHFS_DUPLICATES(flags)		SQUASHFS_BIT(flags, \
 						SQUASHFS_DUPLICATE)

 #define SQUASHFS_EXPORTABLE(flags)		SQUASHFS_BIT(flags, \
 						SQUASHFS_EXPORT)

 #define SQUASHFS_COMP_OPTS(flags)		SQUASHFS_BIT(flags, \
 						SQUASHFS_COMP_OPT)

 /* Inode types including extended types */
 #define SQUASHFS_DIR_TYPE		1
 #define SQUASHFS_REG_TYPE		2
 #define SQUASHFS_SYMLINK_TYPE		3
 #define SQUASHFS_BLKDEV_TYPE		4
 #define SQUASHFS_CHRDEV_TYPE		5
 #define SQUASHFS_FIFO_TYPE		6
 #define SQUASHFS_SOCKET_TYPE		7
 #define SQUASHFS_LDIR_TYPE		8
 #define SQUASHFS_LREG_TYPE		9
 #define SQUASHFS_LSYMLINK_TYPE		10
 #define SQUASHFS_LBLKDEV_TYPE		11
 #define SQUASHFS_LCHRDEV_TYPE		12
 #define SQUASHFS_LFIFO_TYPE		13
 #define SQUASHFS_LSOCKET_TYPE		14

 /* Max type value stored in directory entry */
 #define SQUASHFS_MAX_DIR_TYPE		7

 /* Xattr types */
 #define SQUASHFS_XATTR_USER             0
 #define SQUASHFS_XATTR_TRUSTED          1
 #define SQUASHFS_XATTR_SECURITY         2
 #define SQUASHFS_XATTR_VALUE_OOL        256
 #define SQUASHFS_XATTR_PREFIX_MASK      0xff

 /* Flag whether block is compressed or uncompressed, bit is set if block is
  * uncompressed */
 #define SQUASHFS_COMPRESSED_BIT		(1 << 15)

 #define SQUASHFS_COMPRESSED_SIZE(B)	(((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
 		(B) & ~SQUASHFS_COMPRESSED_BIT :  SQUASHFS_COMPRESSED_BIT)

 #define SQUASHFS_COMPRESSED(B)		(!((B) & SQUASHFS_COMPRESSED_BIT))

 #define SQUASHFS_COMPRESSED_BIT_BLOCK	(1 << 24)

 #define SQUASHFS_COMPRESSED_SIZE_BLOCK(B)	((B) & \
 						~SQUASHFS_COMPRESSED_BIT_BLOCK)

 #define SQUASHFS_COMPRESSED_BLOCK(B)	(!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))

 /*
  * Inode number ops.  Inodes consist of a compressed block number, and an
  * uncompressed offset within that block
  */
 #define SQUASHFS_INODE_BLK(A)		((unsigned int) ((A) >> 16))

 #define SQUASHFS_INODE_OFFSET(A)	((unsigned int) ((A) & 0xffff))

 #define SQUASHFS_MKINODE(A, B)		((long long)(((long long) (A)\
 					<< 16) + (B)))

 /* fragment and fragment table defines */
 #define SQUASHFS_FRAGMENT_BYTES(A)	\
 				((A) * sizeof(struct squashfs_fragment_entry))

 #define SQUASHFS_FRAGMENT_INDEX(A)	(SQUASHFS_FRAGMENT_BYTES(A) / \
 					SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_FRAGMENT_INDEX_OFFSET(A)	(SQUASHFS_FRAGMENT_BYTES(A) % \
 						SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_FRAGMENT_INDEXES(A)	((SQUASHFS_FRAGMENT_BYTES(A) + \
 					SQUASHFS_METADATA_SIZE - 1) / \
 					SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_FRAGMENT_INDEX_BYTES(A)	(SQUASHFS_FRAGMENT_INDEXES(A) *\
 						sizeof(u64))

 /* inode lookup table defines */
 #define SQUASHFS_LOOKUP_BYTES(A)	((A) * sizeof(u64))

 #define SQUASHFS_LOOKUP_BLOCK(A)	(SQUASHFS_LOOKUP_BYTES(A) / \
 					SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_LOOKUP_BLOCK_OFFSET(A)	(SQUASHFS_LOOKUP_BYTES(A) % \
 					SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_LOOKUP_BLOCKS(A)	((SQUASHFS_LOOKUP_BYTES(A) + \
 					SQUASHFS_METADATA_SIZE - 1) / \
 					SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_LOOKUP_BLOCK_BYTES(A)	(SQUASHFS_LOOKUP_BLOCKS(A) *\
 					sizeof(u64))

 /* uid/gid lookup table defines */
 #define SQUASHFS_ID_BYTES(A)		((A) * sizeof(unsigned int))

 #define SQUASHFS_ID_BLOCK(A)		(SQUASHFS_ID_BYTES(A) / \
 					SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_ID_BLOCK_OFFSET(A)	(SQUASHFS_ID_BYTES(A) % \
 					SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_ID_BLOCKS(A)		((SQUASHFS_ID_BYTES(A) + \
 					SQUASHFS_METADATA_SIZE - 1) / \
 					SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_ID_BLOCK_BYTES(A)	(SQUASHFS_ID_BLOCKS(A) *\
 					sizeof(u64))
 /* xattr id lookup table defines */
 #define SQUASHFS_XATTR_BYTES(A)		((A) * sizeof(struct squashfs_xattr_id))

 #define SQUASHFS_XATTR_BLOCK(A)		(SQUASHFS_XATTR_BYTES(A) / \
 					SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_XATTR_BLOCK_OFFSET(A)	(SQUASHFS_XATTR_BYTES(A) % \
 					SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_XATTR_BLOCKS(A)	((SQUASHFS_XATTR_BYTES(A) + \
 					SQUASHFS_METADATA_SIZE - 1) / \
 					SQUASHFS_METADATA_SIZE)

 #define SQUASHFS_XATTR_BLOCK_BYTES(A)	(SQUASHFS_XATTR_BLOCKS(A) *\
 					sizeof(u64))
 #define SQUASHFS_XATTR_BLK(A)		((unsigned int) ((A) >> 16))

 #define SQUASHFS_XATTR_OFFSET(A)	((unsigned int) ((A) & 0xffff))

 /* cached data constants for filesystem */
 #define SQUASHFS_CACHED_BLKS		8

 /* meta index cache */
 #define SQUASHFS_META_INDEXES	(SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
 #define SQUASHFS_META_ENTRIES	127
 #define SQUASHFS_META_SLOTS	8

 struct meta_entry {
 	u64			data_block;
 	unsigned int		index_block;
 	unsigned short		offset;
 	unsigned short		pad;
 };

 struct meta_index {
 	unsigned int		inode_number;
 	unsigned int		offset;
 	unsigned short		entries;
 	unsigned short		skip;
 	unsigned short		locked;
 	unsigned short		pad;
 	struct meta_entry	meta_entry[SQUASHFS_META_ENTRIES];
 };


 /*
  * definitions for structures on disk
  */
 #define ZLIB_COMPRESSION	1
 #define LZMA_COMPRESSION	2
 #define LZO_COMPRESSION		3
 #define XZ_COMPRESSION		4
 #define LZ4_COMPRESSION		5

 struct squashfs_super_block {
 	__le32			s_magic;
 	__le32			inodes;
 	__le32			mkfs_time;
 	__le32			block_size;
 	__le32			fragments;
 	__le16			compression;
 	__le16			block_log;
 	__le16			flags;
 	__le16			no_ids;
 	__le16			s_major;
 	__le16			s_minor;
 	__le64			root_inode;
 	__le64			bytes_used;
 	__le64			id_table_start;
 	__le64			xattr_id_table_start;
 	__le64			inode_table_start;
 	__le64			directory_table_start;
 	__le64			fragment_table_start;
 	__le64			lookup_table_start;
 };

 struct squashfs_dir_index {
 	__le32			index;
 	__le32			start_block;
 	__le32			size;
 	unsigned char		name[0];
 };

 struct squashfs_base_inode {
 	__le16			inode_type;
 	__le16			mode;
 	__le16			uid;
 	__le16			guid;
 	__le32			mtime;
 	__le32			inode_number;
 };

 struct squashfs_ipc_inode {
 	__le16			inode_type;
 	__le16			mode;
 	__le16			uid;
 	__le16			guid;
 	__le32			mtime;
 	__le32			inode_number;
 	__le32			nlink;
 };

 struct squashfs_lipc_inode {
 	__le16			inode_type;
 	__le16			mode;
 	__le16			uid;
 	__le16			guid;
 	__le32			mtime;
 	__le32			inode_number;
 	__le32			nlink;
 	__le32			xattr;
 };

 struct squashfs_dev_inode {
 	__le16			inode_type;
 	__le16			mode;
 	__le16			uid;
 	__le16			guid;
 	__le32			mtime;
 	__le32			inode_number;
 	__le32			nlink;
 	__le32			rdev;
 };

 struct squashfs_ldev_inode {
 	__le16			inode_type;
 	__le16			mode;
 	__le16			uid;
 	__le16			guid;
 	__le32			mtime;
 	__le32			inode_number;
 	__le32			nlink;
 	__le32			rdev;
 	__le32			xattr;
 };

 struct squashfs_symlink_inode {
 	__le16			inode_type;
 	__le16			mode;
 	__le16			uid;
 	__le16			guid;
 	__le32			mtime;
 	__le32			inode_number;
 	__le32			nlink;
 	__le32			symlink_size;
 	char			symlink[0];
 };

 struct squashfs_reg_inode {
 	__le16			inode_type;
 	__le16			mode;
 	__le16			uid;
 	__le16			guid;
 	__le32			mtime;
 	__le32			inode_number;
 	__le32			start_block;
 	__le32			fragment;
 	__le32			offset;
 	__le32			file_size;
 	__le16			block_list[0];
 };

 struct squashfs_lreg_inode {
 	__le16			inode_type;
 	__le16			mode;
 	__le16			uid;
 	__le16			guid;
 	__le32			mtime;
 	__le32			inode_number;
 	__le64			start_block;
 	__le64			file_size;
 	__le64			sparse;
 	__le32			nlink;
 	__le32			fragment;
 	__le32			offset;
 	__le32			xattr;
 	__le16			block_list[0];
 };

 struct squashfs_dir_inode {
 	__le16			inode_type;
 	__le16			mode;
 	__le16			uid;
 	__le16			guid;
 	__le32			mtime;
 	__le32			inode_number;
 	__le32			start_block;
 	__le32			nlink;
 	__le16			file_size;
 	__le16			offset;
 	__le32			parent_inode;
 };

 struct squashfs_ldir_inode {
 	__le16			inode_type;
 	__le16			mode;
 	__le16			uid;
 	__le16			guid;
 	__le32			mtime;
 	__le32			inode_number;
 	__le32			nlink;
 	__le32			file_size;
 	__le32			start_block;
 	__le32			parent_inode;
 	__le16			i_count;
 	__le16			offset;
 	__le32			xattr;
 	struct squashfs_dir_index	index[0];
 };

 union squashfs_inode {
 	struct squashfs_base_inode		base;
 	struct squashfs_dev_inode		dev;
 	struct squashfs_ldev_inode		ldev;
 	struct squashfs_symlink_inode		symlink;
 	struct squashfs_reg_inode		reg;
 	struct squashfs_lreg_inode		lreg;
 	struct squashfs_dir_inode		dir;
 	struct squashfs_ldir_inode		ldir;
 	struct squashfs_ipc_inode		ipc;
 	struct squashfs_lipc_inode		lipc;
 };

 struct squashfs_dir_entry {
 	__le16			offset;
 	__le16			inode_number;
 	__le16			type;
 	__le16			size;
 	char			name[0];
 };

 struct squashfs_dir_header {
 	__le32			count;
 	__le32			start_block;
 	__le32			inode_number;
 };

 struct squashfs_fragment_entry {
 	__le64			start_block;
 	__le32			size;
 	unsigned int		unused;
 };

 struct squashfs_xattr_entry {
 	__le16			type;
 	__le16			size;
 	char			data[0];
 };

 struct squashfs_xattr_val {
 	__le32			vsize;
 	char			value[0];
 };

 struct squashfs_xattr_id {
 	__le64			xattr;
 	__le32			count;
 	__le32			size;
 };

 struct squashfs_xattr_id_table {
 	__le64			xattr_table_start;
 	__le32			xattr_ids;
 	__le32			unused;
 };

 #endif
	#ifndef SQUASHFS_FS
	#define SQUASHFS_FS
	/*
	* Squashfs
	*
	* Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
	* Phillip Lougher <phillip@squashfs.org.uk>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version 2,
	* or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	*
	* squashfs_fs.h
	*/

	#define SQUASHFS_CACHED_FRAGMENTS CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
	#define SQUASHFS_MAJOR 4
	#define SQUASHFS_MINOR 0
	#define SQUASHFS_START 0

	/* size of metadata (inode and directory) blocks */
	#define SQUASHFS_METADATA_SIZE 8192

	/* default size of block device I/O */
	#ifdef CONFIG_SQUASHFS_4K_DEVBLK_SIZE
	#define SQUASHFS_DEVBLK_SIZE 4096
	#else
	#define SQUASHFS_DEVBLK_SIZE 1024
	#endif

	#define SQUASHFS_FILE_MAX_SIZE 1048576
	#define SQUASHFS_FILE_MAX_LOG 20

	/* Max length of filename (not 255) */
	#define SQUASHFS_NAME_LEN 256

	/* Max value for directory header count*/
	#define SQUASHFS_DIR_COUNT 256

	#define SQUASHFS_INVALID_FRAG (0xffffffffU)
	#define SQUASHFS_INVALID_XATTR (0xffffffffU)
	#define SQUASHFS_INVALID_BLK (-1LL)

	/* Filesystem flags */
	#define SQUASHFS_NOI 0
	#define SQUASHFS_NOD 1
	#define SQUASHFS_NOF 3
	#define SQUASHFS_NO_FRAG 4
	#define SQUASHFS_ALWAYS_FRAG 5
	#define SQUASHFS_DUPLICATE 6
	#define SQUASHFS_EXPORT 7
	#define SQUASHFS_COMP_OPT 10

	#define SQUASHFS_BIT(flag, bit) ((flag >> bit) & 1)

	#define SQUASHFS_UNCOMPRESSED_INODES(flags) SQUASHFS_BIT(flags, \
	SQUASHFS_NOI)

	#define SQUASHFS_UNCOMPRESSED_DATA(flags) SQUASHFS_BIT(flags, \
	SQUASHFS_NOD)

	#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
	SQUASHFS_NOF)

	#define SQUASHFS_NO_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
	SQUASHFS_NO_FRAG)

	#define SQUASHFS_ALWAYS_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
	SQUASHFS_ALWAYS_FRAG)

	#define SQUASHFS_DUPLICATES(flags) SQUASHFS_BIT(flags, \
	SQUASHFS_DUPLICATE)

	#define SQUASHFS_EXPORTABLE(flags) SQUASHFS_BIT(flags, \
	SQUASHFS_EXPORT)

	#define SQUASHFS_COMP_OPTS(flags) SQUASHFS_BIT(flags, \
	SQUASHFS_COMP_OPT)

	/* Inode types including extended types */
	#define SQUASHFS_DIR_TYPE 1
	#define SQUASHFS_REG_TYPE 2
	#define SQUASHFS_SYMLINK_TYPE 3
	#define SQUASHFS_BLKDEV_TYPE 4
	#define SQUASHFS_CHRDEV_TYPE 5
	#define SQUASHFS_FIFO_TYPE 6
	#define SQUASHFS_SOCKET_TYPE 7
	#define SQUASHFS_LDIR_TYPE 8
	#define SQUASHFS_LREG_TYPE 9
	#define SQUASHFS_LSYMLINK_TYPE 10
	#define SQUASHFS_LBLKDEV_TYPE 11
	#define SQUASHFS_LCHRDEV_TYPE 12
	#define SQUASHFS_LFIFO_TYPE 13
	#define SQUASHFS_LSOCKET_TYPE 14

	/* Max type value stored in directory entry */
	#define SQUASHFS_MAX_DIR_TYPE 7

	/* Xattr types */
	#define SQUASHFS_XATTR_USER 0
	#define SQUASHFS_XATTR_TRUSTED 1
	#define SQUASHFS_XATTR_SECURITY 2
	#define SQUASHFS_XATTR_VALUE_OOL 256
	#define SQUASHFS_XATTR_PREFIX_MASK 0xff

	/* Flag whether block is compressed or uncompressed, bit is set if block is
	* uncompressed */
	#define SQUASHFS_COMPRESSED_BIT (1 << 15)

	#define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
	(B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT)

	#define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT))

	#define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24)

	#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) ((B) & \
	~SQUASHFS_COMPRESSED_BIT_BLOCK)

	#define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))

	/*
	* Inode number ops. Inodes consist of a compressed block number, and an
	* uncompressed offset within that block
	*/
	#define SQUASHFS_INODE_BLK(A) ((unsigned int) ((A) >> 16))

	#define SQUASHFS_INODE_OFFSET(A) ((unsigned int) ((A) & 0xffff))

	#define SQUASHFS_MKINODE(A, B) ((long long)(((long long) (A)\
	<< 16) + (B)))

	/* fragment and fragment table defines */
	#define SQUASHFS_FRAGMENT_BYTES(A) \
	((A) * sizeof(struct squashfs_fragment_entry))

	#define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \
	SQUASHFS_METADATA_SIZE - 1) / \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\
	sizeof(u64))

	/* inode lookup table defines */
	#define SQUASHFS_LOOKUP_BYTES(A) ((A) * sizeof(u64))

	#define SQUASHFS_LOOKUP_BLOCK(A) (SQUASHFS_LOOKUP_BYTES(A) / \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_LOOKUP_BLOCKS(A) ((SQUASHFS_LOOKUP_BYTES(A) + \
	SQUASHFS_METADATA_SIZE - 1) / \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_LOOKUP_BLOCK_BYTES(A) (SQUASHFS_LOOKUP_BLOCKS(A) *\
	sizeof(u64))

	/* uid/gid lookup table defines */
	#define SQUASHFS_ID_BYTES(A) ((A) * sizeof(unsigned int))

	#define SQUASHFS_ID_BLOCK(A) (SQUASHFS_ID_BYTES(A) / \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_ID_BLOCK_OFFSET(A) (SQUASHFS_ID_BYTES(A) % \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_ID_BLOCKS(A) ((SQUASHFS_ID_BYTES(A) + \
	SQUASHFS_METADATA_SIZE - 1) / \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_ID_BLOCK_BYTES(A) (SQUASHFS_ID_BLOCKS(A) *\
	sizeof(u64))
	/* xattr id lookup table defines */
	#define SQUASHFS_XATTR_BYTES(A) ((A) * sizeof(struct squashfs_xattr_id))

	#define SQUASHFS_XATTR_BLOCK(A) (SQUASHFS_XATTR_BYTES(A) / \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_XATTR_BLOCK_OFFSET(A) (SQUASHFS_XATTR_BYTES(A) % \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_XATTR_BLOCKS(A) ((SQUASHFS_XATTR_BYTES(A) + \
	SQUASHFS_METADATA_SIZE - 1) / \
	SQUASHFS_METADATA_SIZE)

	#define SQUASHFS_XATTR_BLOCK_BYTES(A) (SQUASHFS_XATTR_BLOCKS(A) *\
	sizeof(u64))
	#define SQUASHFS_XATTR_BLK(A) ((unsigned int) ((A) >> 16))

	#define SQUASHFS_XATTR_OFFSET(A) ((unsigned int) ((A) & 0xffff))

	/* cached data constants for filesystem */
	#define SQUASHFS_CACHED_BLKS 8

	/* meta index cache */
	#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
	#define SQUASHFS_META_ENTRIES 127
	#define SQUASHFS_META_SLOTS 8

	struct meta_entry {
	u64 data_block;
	unsigned int index_block;
	unsigned short offset;
	unsigned short pad;
	};

	struct meta_index {
	unsigned int inode_number;
	unsigned int offset;
	unsigned short entries;
	unsigned short skip;
	unsigned short locked;
	unsigned short pad;
	struct meta_entry meta_entry[SQUASHFS_META_ENTRIES];
	};


	/*
	* definitions for structures on disk
	*/
	#define ZLIB_COMPRESSION 1
	#define LZMA_COMPRESSION 2
	#define LZO_COMPRESSION 3
	#define XZ_COMPRESSION 4
	#define LZ4_COMPRESSION 5

	struct squashfs_super_block {
	__le32 s_magic;
	__le32 inodes;
	__le32 mkfs_time;
	__le32 block_size;
	__le32 fragments;
	__le16 compression;
	__le16 block_log;
	__le16 flags;
	__le16 no_ids;
	__le16 s_major;
	__le16 s_minor;
	__le64 root_inode;
	__le64 bytes_used;
	__le64 id_table_start;
	__le64 xattr_id_table_start;
	__le64 inode_table_start;
	__le64 directory_table_start;
	__le64 fragment_table_start;
	__le64 lookup_table_start;
	};

	struct squashfs_dir_index {
	__le32 index;
	__le32 start_block;
	__le32 size;
	unsigned char name[0];
	};

	struct squashfs_base_inode {
	__le16 inode_type;
	__le16 mode;
	__le16 uid;
	__le16 guid;
	__le32 mtime;
	__le32 inode_number;
	};

	struct squashfs_ipc_inode {
	__le16 inode_type;
	__le16 mode;
	__le16 uid;
	__le16 guid;
	__le32 mtime;
	__le32 inode_number;
	__le32 nlink;
	};

	struct squashfs_lipc_inode {
	__le16 inode_type;
	__le16 mode;
	__le16 uid;
	__le16 guid;
	__le32 mtime;
	__le32 inode_number;
	__le32 nlink;
	__le32 xattr;
	};

	struct squashfs_dev_inode {
	__le16 inode_type;
	__le16 mode;
	__le16 uid;
	__le16 guid;
	__le32 mtime;
	__le32 inode_number;
	__le32 nlink;
	__le32 rdev;
	};

	struct squashfs_ldev_inode {
	__le16 inode_type;
	__le16 mode;
	__le16 uid;
	__le16 guid;
	__le32 mtime;
	__le32 inode_number;
	__le32 nlink;
	__le32 rdev;
	__le32 xattr;
	};

	struct squashfs_symlink_inode {
	__le16 inode_type;
	__le16 mode;
	__le16 uid;
	__le16 guid;
	__le32 mtime;
	__le32 inode_number;
	__le32 nlink;
	__le32 symlink_size;
	char symlink[0];
	};

	struct squashfs_reg_inode {
	__le16 inode_type;
	__le16 mode;
	__le16 uid;
	__le16 guid;
	__le32 mtime;
	__le32 inode_number;
	__le32 start_block;
	__le32 fragment;
	__le32 offset;
	__le32 file_size;
	__le16 block_list[0];
	};

	struct squashfs_lreg_inode {
	__le16 inode_type;
	__le16 mode;
	__le16 uid;
	__le16 guid;
	__le32 mtime;
	__le32 inode_number;
	__le64 start_block;
	__le64 file_size;
	__le64 sparse;
	__le32 nlink;
	__le32 fragment;
	__le32 offset;
	__le32 xattr;
	__le16 block_list[0];
	};

	struct squashfs_dir_inode {
	__le16 inode_type;
	__le16 mode;
	__le16 uid;
	__le16 guid;
	__le32 mtime;
	__le32 inode_number;
	__le32 start_block;
	__le32 nlink;
	__le16 file_size;
	__le16 offset;
	__le32 parent_inode;
	};

	struct squashfs_ldir_inode {
	__le16 inode_type;
	__le16 mode;
	__le16 uid;
	__le16 guid;
	__le32 mtime;
	__le32 inode_number;
	__le32 nlink;
	__le32 file_size;
	__le32 start_block;
	__le32 parent_inode;
	__le16 i_count;
	__le16 offset;
	__le32 xattr;
	struct squashfs_dir_index index[0];
	};

	union squashfs_inode {
	struct squashfs_base_inode base;
	struct squashfs_dev_inode dev;
	struct squashfs_ldev_inode ldev;
	struct squashfs_symlink_inode symlink;
	struct squashfs_reg_inode reg;
	struct squashfs_lreg_inode lreg;
	struct squashfs_dir_inode dir;
	struct squashfs_ldir_inode ldir;
	struct squashfs_ipc_inode ipc;
	struct squashfs_lipc_inode lipc;
	};

	struct squashfs_dir_entry {
	__le16 offset;
	__le16 inode_number;
	__le16 type;
	__le16 size;
	char name[0];
	};

	struct squashfs_dir_header {
	__le32 count;
	__le32 start_block;
	__le32 inode_number;
	};

	struct squashfs_fragment_entry {
	__le64 start_block;
	__le32 size;
	unsigned int unused;
	};

	struct squashfs_xattr_entry {
	__le16 type;
	__le16 size;
	char data[0];
	};

	struct squashfs_xattr_val {
	__le32 vsize;
	char value[0];
	};

	struct squashfs_xattr_id {
	__le64 xattr;
	__le32 count;
	__le32 size;
	};

	struct squashfs_xattr_id_table {
	__le64 xattr_table_start;
	__le32 xattr_ids;
	__le32 unused;
	};

	#endif