[linux-2.6-block.git] / fs / squashfs / squashfs_fs.h

#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

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
Commit	Line	Data
ffae2cd7 PL	1	#ifndef SQUASHFS_FS
	2	#define SQUASHFS_FS
	3	/*
	4	* Squashfs
	5	*
	6	* Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
d7f2ff67	7	* Phillip Lougher <phillip@squashfs.org.uk>
ffae2cd7 PL	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License
	11	* as published by the Free Software Foundation; either version 2,
	12	* or (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	22	*
	23	* squashfs_fs.h
	24	*/
	25
	26	#define SQUASHFS_CACHED_FRAGMENTS CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
	27	#define SQUASHFS_MAJOR 4
	28	#define SQUASHFS_MINOR 0
ffae2cd7 PL	29	#define SQUASHFS_START 0
	30
	31	/* size of metadata (inode and directory) blocks */
	32	#define SQUASHFS_METADATA_SIZE 8192
ffae2cd7	33
7657cacf PL	34	/* default size of block device I/O */
	35	#ifdef CONFIG_SQUASHFS_4K_DEVBLK_SIZE
	36	#define SQUASHFS_DEVBLK_SIZE 4096
	37	#else
	38	#define SQUASHFS_DEVBLK_SIZE 1024
	39	#endif
	40
ffae2cd7 PL	41	#define SQUASHFS_FILE_MAX_SIZE 1048576
	42	#define SQUASHFS_FILE_MAX_LOG 20
	43
ffae2cd7 PL	44	/* Max length of filename (not 255) */
	45	#define SQUASHFS_NAME_LEN 256
	46
4826d83d AY	47	/* Max value for directory header count*/
	48	#define SQUASHFS_DIR_COUNT 256
	49
ffae2cd7	50	#define SQUASHFS_INVALID_FRAG (0xffffffffU)
f41d207c	51	#define SQUASHFS_INVALID_XATTR (0xffffffffU)
ffae2cd7 PL	52	#define SQUASHFS_INVALID_BLK (-1LL)
	53
	54	/* Filesystem flags */
	55	#define SQUASHFS_NOI 0
	56	#define SQUASHFS_NOD 1
	57	#define SQUASHFS_NOF 3
	58	#define SQUASHFS_NO_FRAG 4
	59	#define SQUASHFS_ALWAYS_FRAG 5
	60	#define SQUASHFS_DUPLICATE 6
	61	#define SQUASHFS_EXPORT 7
b7fc0ff0	62	#define SQUASHFS_COMP_OPT 10
ffae2cd7 PL	63
	64	#define SQUASHFS_BIT(flag, bit) ((flag >> bit) & 1)
	65
	66	#define SQUASHFS_UNCOMPRESSED_INODES(flags) SQUASHFS_BIT(flags, \
	67	SQUASHFS_NOI)
	68
	69	#define SQUASHFS_UNCOMPRESSED_DATA(flags) SQUASHFS_BIT(flags, \
	70	SQUASHFS_NOD)
	71
	72	#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
	73	SQUASHFS_NOF)
	74
	75	#define SQUASHFS_NO_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
	76	SQUASHFS_NO_FRAG)
	77
	78	#define SQUASHFS_ALWAYS_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
	79	SQUASHFS_ALWAYS_FRAG)
	80
	81	#define SQUASHFS_DUPLICATES(flags) SQUASHFS_BIT(flags, \
	82	SQUASHFS_DUPLICATE)
	83
	84	#define SQUASHFS_EXPORTABLE(flags) SQUASHFS_BIT(flags, \
	85	SQUASHFS_EXPORT)
	86
b7fc0ff0 PL	87	#define SQUASHFS_COMP_OPTS(flags) SQUASHFS_BIT(flags, \
	88	SQUASHFS_COMP_OPT)
	89
9e012423	90	/* Inode types including extended types */
ffae2cd7 PL	91	#define SQUASHFS_DIR_TYPE 1
	92	#define SQUASHFS_REG_TYPE 2
	93	#define SQUASHFS_SYMLINK_TYPE 3
	94	#define SQUASHFS_BLKDEV_TYPE 4
	95	#define SQUASHFS_CHRDEV_TYPE 5
	96	#define SQUASHFS_FIFO_TYPE 6
	97	#define SQUASHFS_SOCKET_TYPE 7
	98	#define SQUASHFS_LDIR_TYPE 8
	99	#define SQUASHFS_LREG_TYPE 9
	100	#define SQUASHFS_LSYMLINK_TYPE 10
	101	#define SQUASHFS_LBLKDEV_TYPE 11
	102	#define SQUASHFS_LCHRDEV_TYPE 12
	103	#define SQUASHFS_LFIFO_TYPE 13
	104	#define SQUASHFS_LSOCKET_TYPE 14
	105
9e012423 PL	106	/* Max type value stored in directory entry */
	107	#define SQUASHFS_MAX_DIR_TYPE 7
	108
f41d207c PL	109	/* Xattr types */
	110	#define SQUASHFS_XATTR_USER 0
	111	#define SQUASHFS_XATTR_TRUSTED 1
	112	#define SQUASHFS_XATTR_SECURITY 2
	113	#define SQUASHFS_XATTR_VALUE_OOL 256
	114	#define SQUASHFS_XATTR_PREFIX_MASK 0xff
	115
ffae2cd7 PL	116	/* Flag whether block is compressed or uncompressed, bit is set if block is
	117	* uncompressed */
	118	#define SQUASHFS_COMPRESSED_BIT (1 << 15)
	119
	120	#define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
	121	(B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT)
	122
	123	#define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT))
	124
	125	#define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24)
	126
	127	#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) ((B) & \
	128	~SQUASHFS_COMPRESSED_BIT_BLOCK)
	129
	130	#define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
	131
	132	/*
	133	* Inode number ops. Inodes consist of a compressed block number, and an
	134	* uncompressed offset within that block
	135	*/
	136	#define SQUASHFS_INODE_BLK(A) ((unsigned int) ((A) >> 16))
	137
	138	#define SQUASHFS_INODE_OFFSET(A) ((unsigned int) ((A) & 0xffff))
	139
	140	#define SQUASHFS_MKINODE(A, B) ((long long)(((long long) (A)\
	141	<< 16) + (B)))
	142
ffae2cd7 PL	143	/* fragment and fragment table defines */
	144	#define SQUASHFS_FRAGMENT_BYTES(A) \
	145	((A) * sizeof(struct squashfs_fragment_entry))
	146
	147	#define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \
	148	SQUASHFS_METADATA_SIZE)
	149
	150	#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \
	151	SQUASHFS_METADATA_SIZE)
	152
	153	#define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \
	154	SQUASHFS_METADATA_SIZE - 1) / \
	155	SQUASHFS_METADATA_SIZE)
	156
	157	#define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\
	158	sizeof(u64))
	159
	160	/* inode lookup table defines */
	161	#define SQUASHFS_LOOKUP_BYTES(A) ((A) * sizeof(u64))
	162
	163	#define SQUASHFS_LOOKUP_BLOCK(A) (SQUASHFS_LOOKUP_BYTES(A) / \
	164	SQUASHFS_METADATA_SIZE)
	165
	166	#define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \
	167	SQUASHFS_METADATA_SIZE)
	168
	169	#define SQUASHFS_LOOKUP_BLOCKS(A) ((SQUASHFS_LOOKUP_BYTES(A) + \
	170	SQUASHFS_METADATA_SIZE - 1) / \
	171	SQUASHFS_METADATA_SIZE)
	172
	173	#define SQUASHFS_LOOKUP_BLOCK_BYTES(A) (SQUASHFS_LOOKUP_BLOCKS(A) *\
	174	sizeof(u64))
	175
	176	/* uid/gid lookup table defines */
	177	#define SQUASHFS_ID_BYTES(A) ((A) * sizeof(unsigned int))
	178
	179	#define SQUASHFS_ID_BLOCK(A) (SQUASHFS_ID_BYTES(A) / \
	180	SQUASHFS_METADATA_SIZE)
	181
	182	#define SQUASHFS_ID_BLOCK_OFFSET(A) (SQUASHFS_ID_BYTES(A) % \
	183	SQUASHFS_METADATA_SIZE)
	184
	185	#define SQUASHFS_ID_BLOCKS(A) ((SQUASHFS_ID_BYTES(A) + \
	186	SQUASHFS_METADATA_SIZE - 1) / \
	187	SQUASHFS_METADATA_SIZE)
	188
	189	#define SQUASHFS_ID_BLOCK_BYTES(A) (SQUASHFS_ID_BLOCKS(A) *\
	190	sizeof(u64))
4b5397dc PL	191	/* xattr id lookup table defines */
	192	#define SQUASHFS_XATTR_BYTES(A) ((A) * sizeof(struct squashfs_xattr_id))
	193
	194	#define SQUASHFS_XATTR_BLOCK(A) (SQUASHFS_XATTR_BYTES(A) / \
	195	SQUASHFS_METADATA_SIZE)
	196
	197	#define SQUASHFS_XATTR_BLOCK_OFFSET(A) (SQUASHFS_XATTR_BYTES(A) % \
	198	SQUASHFS_METADATA_SIZE)
	199
	200	#define SQUASHFS_XATTR_BLOCKS(A) ((SQUASHFS_XATTR_BYTES(A) + \
	201	SQUASHFS_METADATA_SIZE - 1) / \
	202	SQUASHFS_METADATA_SIZE)
	203
	204	#define SQUASHFS_XATTR_BLOCK_BYTES(A) (SQUASHFS_XATTR_BLOCKS(A) *\
	205	sizeof(u64))
	206	#define SQUASHFS_XATTR_BLK(A) ((unsigned int) ((A) >> 16))
	207
	208	#define SQUASHFS_XATTR_OFFSET(A) ((unsigned int) ((A) & 0xffff))
ffae2cd7 PL	209
	210	/* cached data constants for filesystem */
	211	#define SQUASHFS_CACHED_BLKS 8
	212
ffae2cd7 PL	213	/* meta index cache */
	214	#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
	215	#define SQUASHFS_META_ENTRIES 127
	216	#define SQUASHFS_META_SLOTS 8
	217
	218	struct meta_entry {
	219	u64 data_block;
	220	unsigned int index_block;
	221	unsigned short offset;
	222	unsigned short pad;
	223	};
	224
	225	struct meta_index {
	226	unsigned int inode_number;
	227	unsigned int offset;
	228	unsigned short entries;
	229	unsigned short skip;
	230	unsigned short locked;
	231	unsigned short pad;
	232	struct meta_entry meta_entry[SQUASHFS_META_ENTRIES];
	233	};
	234
	235
	236	/*
	237	* definitions for structures on disk
	238	*/
dc325678 PL	239	#define ZLIB_COMPRESSION 1
	240	#define LZMA_COMPRESSION 2
	241	#define LZO_COMPRESSION 3
81bb8deb	242	#define XZ_COMPRESSION 4
ffae2cd7 PL	243
	244	struct squashfs_super_block {
	245	__le32 s_magic;
	246	__le32 inodes;
	247	__le32 mkfs_time;
	248	__le32 block_size;
	249	__le32 fragments;
	250	__le16 compression;
	251	__le16 block_log;
	252	__le16 flags;
	253	__le16 no_ids;
	254	__le16 s_major;
	255	__le16 s_minor;
	256	__le64 root_inode;
	257	__le64 bytes_used;
	258	__le64 id_table_start;
4b5397dc	259	__le64 xattr_id_table_start;
ffae2cd7 PL	260	__le64 inode_table_start;
	261	__le64 directory_table_start;
	262	__le64 fragment_table_start;
	263	__le64 lookup_table_start;
	264	};
	265
	266	struct squashfs_dir_index {
	267	__le32 index;
	268	__le32 start_block;
	269	__le32 size;
	270	unsigned char name[0];
	271	};
	272
	273	struct squashfs_base_inode {
	274	__le16 inode_type;
	275	__le16 mode;
	276	__le16 uid;
	277	__le16 guid;
	278	__le32 mtime;
66048c38	279	__le32 inode_number;
ffae2cd7 PL	280	};
	281
	282	struct squashfs_ipc_inode {
	283	__le16 inode_type;
	284	__le16 mode;
	285	__le16 uid;
	286	__le16 guid;
	287	__le32 mtime;
66048c38	288	__le32 inode_number;
ffae2cd7 PL	289	__le32 nlink;
	290	};
	291
67f66cc6 PL	292	struct squashfs_lipc_inode {
	293	__le16 inode_type;
	294	__le16 mode;
	295	__le16 uid;
	296	__le16 guid;
	297	__le32 mtime;
66048c38	298	__le32 inode_number;
67f66cc6 PL	299	__le32 nlink;
	300	__le32 xattr;
	301	};
	302
ffae2cd7 PL	303	struct squashfs_dev_inode {
	304	__le16 inode_type;
	305	__le16 mode;
	306	__le16 uid;
	307	__le16 guid;
	308	__le32 mtime;
66048c38	309	__le32 inode_number;
ffae2cd7 PL	310	__le32 nlink;
	311	__le32 rdev;
	312	};
	313
67f66cc6 PL	314	struct squashfs_ldev_inode {
	315	__le16 inode_type;
	316	__le16 mode;
	317	__le16 uid;
	318	__le16 guid;
	319	__le32 mtime;
66048c38	320	__le32 inode_number;
67f66cc6 PL	321	__le32 nlink;
	322	__le32 rdev;
	323	__le32 xattr;
	324	};
	325
ffae2cd7 PL	326	struct squashfs_symlink_inode {
	327	__le16 inode_type;
	328	__le16 mode;
	329	__le16 uid;
	330	__le16 guid;
	331	__le32 mtime;
66048c38	332	__le32 inode_number;
ffae2cd7 PL	333	__le32 nlink;
	334	__le32 symlink_size;
	335	char symlink[0];
	336	};
	337
	338	struct squashfs_reg_inode {
	339	__le16 inode_type;
	340	__le16 mode;
	341	__le16 uid;
	342	__le16 guid;
	343	__le32 mtime;
66048c38	344	__le32 inode_number;
ffae2cd7 PL	345	__le32 start_block;
	346	__le32 fragment;
	347	__le32 offset;
	348	__le32 file_size;
	349	__le16 block_list[0];
	350	};
	351
	352	struct squashfs_lreg_inode {
	353	__le16 inode_type;
	354	__le16 mode;
	355	__le16 uid;
	356	__le16 guid;
	357	__le32 mtime;
66048c38	358	__le32 inode_number;
ffae2cd7 PL	359	__le64 start_block;
	360	__le64 file_size;
	361	__le64 sparse;
	362	__le32 nlink;
	363	__le32 fragment;
	364	__le32 offset;
	365	__le32 xattr;
	366	__le16 block_list[0];
	367	};
	368
	369	struct squashfs_dir_inode {
	370	__le16 inode_type;
	371	__le16 mode;
	372	__le16 uid;
	373	__le16 guid;
	374	__le32 mtime;
66048c38	375	__le32 inode_number;
ffae2cd7 PL	376	__le32 start_block;
	377	__le32 nlink;
	378	__le16 file_size;
	379	__le16 offset;
	380	__le32 parent_inode;
	381	};
	382
	383	struct squashfs_ldir_inode {
	384	__le16 inode_type;
	385	__le16 mode;
	386	__le16 uid;
	387	__le16 guid;
	388	__le32 mtime;
66048c38	389	__le32 inode_number;
ffae2cd7 PL	390	__le32 nlink;
	391	__le32 file_size;
	392	__le32 start_block;
	393	__le32 parent_inode;
	394	__le16 i_count;
	395	__le16 offset;
	396	__le32 xattr;
	397	struct squashfs_dir_index index[0];
	398	};
	399
	400	union squashfs_inode {
	401	struct squashfs_base_inode base;
	402	struct squashfs_dev_inode dev;
67f66cc6	403	struct squashfs_ldev_inode ldev;
ffae2cd7 PL	404	struct squashfs_symlink_inode symlink;
	405	struct squashfs_reg_inode reg;
	406	struct squashfs_lreg_inode lreg;
	407	struct squashfs_dir_inode dir;
	408	struct squashfs_ldir_inode ldir;
	409	struct squashfs_ipc_inode ipc;
67f66cc6	410	struct squashfs_lipc_inode lipc;
ffae2cd7 PL	411	};
	412
	413	struct squashfs_dir_entry {
	414	__le16 offset;
	415	__le16 inode_number;
	416	__le16 type;
	417	__le16 size;
	418	char name[0];
	419	};
	420
	421	struct squashfs_dir_header {
	422	__le32 count;
	423	__le32 start_block;
	424	__le32 inode_number;
	425	};
	426
	427	struct squashfs_fragment_entry {
	428	__le64 start_block;
	429	__le32 size;
	430	unsigned int unused;
	431	};
	432
f41d207c PL	433	struct squashfs_xattr_entry {
	434	__le16 type;
	435	__le16 size;
	436	char data[0];
	437	};
	438
	439	struct squashfs_xattr_val {
	440	__le32 vsize;
	441	char value[0];
	442	};
	443
4b5397dc PL	444	struct squashfs_xattr_id {
	445	__le64 xattr;
	446	__le32 count;
	447	__le32 size;
	448	};
	449
	450	struct squashfs_xattr_id_table {
	451	__le64 xattr_table_start;
	452	__le32 xattr_ids;
	453	__le32 unused;
	454	};
	455
ffae2cd7	456	#endif