[deliverable/linux.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@lougher.demon.co.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
#define SQUASHFS_METADATA_LOG		13

/* default size of data blocks */
#define SQUASHFS_FILE_SIZE		131072
#define SQUASHFS_FILE_LOG		17

#define SQUASHFS_FILE_MAX_SIZE		1048576
#define SQUASHFS_FILE_MAX_LOG		20

/* Max number of uids and gids */
#define SQUASHFS_IDS			65536

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

/* Max number of types and file 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

/* 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)))

/* Translate between VFS mode and squashfs mode */
#define SQUASHFS_MODE(A)		((A) & 0xfff)

/* 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

#define SQUASHFS_MAX_FILE_SIZE_LOG	64

#define SQUASHFS_MAX_FILE_SIZE		(1LL << \
					(SQUASHFS_MAX_FILE_SIZE_LOG - 2))

/* 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
	7	* Phillip Lougher <phillip@lougher.demon.co.uk>
	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
	33	#define SQUASHFS_METADATA_LOG 13
	34
	35	/* default size of data blocks */
	36	#define SQUASHFS_FILE_SIZE 131072
	37	#define SQUASHFS_FILE_LOG 17
	38
	39	#define SQUASHFS_FILE_MAX_SIZE 1048576
	40	#define SQUASHFS_FILE_MAX_LOG 20
	41
	42	/* Max number of uids and gids */
	43	#define SQUASHFS_IDS 65536
	44
	45	/* Max length of filename (not 255) */
	46	#define SQUASHFS_NAME_LEN 256
	47
	48	#define SQUASHFS_INVALID_FRAG (0xffffffffU)
f41d207c	49	#define SQUASHFS_INVALID_XATTR (0xffffffffU)
ffae2cd7 PL	50	#define SQUASHFS_INVALID_BLK (-1LL)
	51
	52	/* Filesystem flags */
	53	#define SQUASHFS_NOI 0
	54	#define SQUASHFS_NOD 1
	55	#define SQUASHFS_NOF 3
	56	#define SQUASHFS_NO_FRAG 4
	57	#define SQUASHFS_ALWAYS_FRAG 5
	58	#define SQUASHFS_DUPLICATE 6
	59	#define SQUASHFS_EXPORT 7
b7fc0ff0	60	#define SQUASHFS_COMP_OPT 10
ffae2cd7 PL	61
	62	#define SQUASHFS_BIT(flag, bit) ((flag >> bit) & 1)
	63
	64	#define SQUASHFS_UNCOMPRESSED_INODES(flags) SQUASHFS_BIT(flags, \
	65	SQUASHFS_NOI)
	66
	67	#define SQUASHFS_UNCOMPRESSED_DATA(flags) SQUASHFS_BIT(flags, \
	68	SQUASHFS_NOD)
	69
	70	#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
	71	SQUASHFS_NOF)
	72
	73	#define SQUASHFS_NO_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
	74	SQUASHFS_NO_FRAG)
	75
	76	#define SQUASHFS_ALWAYS_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
	77	SQUASHFS_ALWAYS_FRAG)
	78
	79	#define SQUASHFS_DUPLICATES(flags) SQUASHFS_BIT(flags, \
	80	SQUASHFS_DUPLICATE)
	81
	82	#define SQUASHFS_EXPORTABLE(flags) SQUASHFS_BIT(flags, \
	83	SQUASHFS_EXPORT)
	84
b7fc0ff0 PL	85	#define SQUASHFS_COMP_OPTS(flags) SQUASHFS_BIT(flags, \
	86	SQUASHFS_COMP_OPT)
	87
ffae2cd7 PL	88	/* Max number of types and file types */
	89	#define SQUASHFS_DIR_TYPE 1
	90	#define SQUASHFS_REG_TYPE 2
	91	#define SQUASHFS_SYMLINK_TYPE 3
	92	#define SQUASHFS_BLKDEV_TYPE 4
	93	#define SQUASHFS_CHRDEV_TYPE 5
	94	#define SQUASHFS_FIFO_TYPE 6
	95	#define SQUASHFS_SOCKET_TYPE 7
	96	#define SQUASHFS_LDIR_TYPE 8
	97	#define SQUASHFS_LREG_TYPE 9
	98	#define SQUASHFS_LSYMLINK_TYPE 10
	99	#define SQUASHFS_LBLKDEV_TYPE 11
	100	#define SQUASHFS_LCHRDEV_TYPE 12
	101	#define SQUASHFS_LFIFO_TYPE 13
	102	#define SQUASHFS_LSOCKET_TYPE 14
	103
f41d207c PL	104	/* Xattr types */
	105	#define SQUASHFS_XATTR_USER 0
	106	#define SQUASHFS_XATTR_TRUSTED 1
	107	#define SQUASHFS_XATTR_SECURITY 2
	108	#define SQUASHFS_XATTR_VALUE_OOL 256
	109	#define SQUASHFS_XATTR_PREFIX_MASK 0xff
	110
ffae2cd7 PL	111	/* Flag whether block is compressed or uncompressed, bit is set if block is
	112	* uncompressed */
	113	#define SQUASHFS_COMPRESSED_BIT (1 << 15)
	114
	115	#define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
	116	(B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT)
	117
	118	#define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT))
	119
	120	#define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24)
	121
	122	#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) ((B) & \
	123	~SQUASHFS_COMPRESSED_BIT_BLOCK)
	124
	125	#define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
	126
	127	/*
	128	* Inode number ops. Inodes consist of a compressed block number, and an
	129	* uncompressed offset within that block
	130	*/
	131	#define SQUASHFS_INODE_BLK(A) ((unsigned int) ((A) >> 16))
	132
	133	#define SQUASHFS_INODE_OFFSET(A) ((unsigned int) ((A) & 0xffff))
	134
	135	#define SQUASHFS_MKINODE(A, B) ((long long)(((long long) (A)\
	136	<< 16) + (B)))
	137
	138	/* Translate between VFS mode and squashfs mode */
	139	#define SQUASHFS_MODE(A) ((A) & 0xfff)
	140
	141	/* fragment and fragment table defines */
	142	#define SQUASHFS_FRAGMENT_BYTES(A) \
	143	((A) * sizeof(struct squashfs_fragment_entry))
	144
	145	#define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \
	146	SQUASHFS_METADATA_SIZE)
	147
	148	#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \
	149	SQUASHFS_METADATA_SIZE)
	150
	151	#define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \
	152	SQUASHFS_METADATA_SIZE - 1) / \
	153	SQUASHFS_METADATA_SIZE)
	154
	155	#define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\
	156	sizeof(u64))
	157
	158	/* inode lookup table defines */
	159	#define SQUASHFS_LOOKUP_BYTES(A) ((A) * sizeof(u64))
	160
	161	#define SQUASHFS_LOOKUP_BLOCK(A) (SQUASHFS_LOOKUP_BYTES(A) / \
	162	SQUASHFS_METADATA_SIZE)
	163
	164	#define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \
	165	SQUASHFS_METADATA_SIZE)
	166
	167	#define SQUASHFS_LOOKUP_BLOCKS(A) ((SQUASHFS_LOOKUP_BYTES(A) + \
	168	SQUASHFS_METADATA_SIZE - 1) / \
	169	SQUASHFS_METADATA_SIZE)
	170
	171	#define SQUASHFS_LOOKUP_BLOCK_BYTES(A) (SQUASHFS_LOOKUP_BLOCKS(A) *\
	172	sizeof(u64))
	173
	174	/* uid/gid lookup table defines */
175	#define SQUASHFS_ID_BYTES(A) ((A) * sizeof(unsigned int))
176
177	#define SQUASHFS_ID_BLOCK(A) (SQUASHFS_ID_BYTES(A) / \
178	SQUASHFS_METADATA_SIZE)
179
180	#define SQUASHFS_ID_BLOCK_OFFSET(A) (SQUASHFS_ID_BYTES(A) % \
181	SQUASHFS_METADATA_SIZE)
182
183	#define SQUASHFS_ID_BLOCKS(A) ((SQUASHFS_ID_BYTES(A) + \
184	SQUASHFS_METADATA_SIZE - 1) / \
185	SQUASHFS_METADATA_SIZE)
186
187	#define SQUASHFS_ID_BLOCK_BYTES(A) (SQUASHFS_ID_BLOCKS(A) *\
188	sizeof(u64))
4b5397dc PL	189	/* xattr id lookup table defines */
	190	#define SQUASHFS_XATTR_BYTES(A) ((A) * sizeof(struct squashfs_xattr_id))
	191
	192	#define SQUASHFS_XATTR_BLOCK(A) (SQUASHFS_XATTR_BYTES(A) / \
	193	SQUASHFS_METADATA_SIZE)
	194
	195	#define SQUASHFS_XATTR_BLOCK_OFFSET(A) (SQUASHFS_XATTR_BYTES(A) % \
	196	SQUASHFS_METADATA_SIZE)
	197
	198	#define SQUASHFS_XATTR_BLOCKS(A) ((SQUASHFS_XATTR_BYTES(A) + \
	199	SQUASHFS_METADATA_SIZE - 1) / \
	200	SQUASHFS_METADATA_SIZE)
	201
	202	#define SQUASHFS_XATTR_BLOCK_BYTES(A) (SQUASHFS_XATTR_BLOCKS(A) *\
	203	sizeof(u64))
	204	#define SQUASHFS_XATTR_BLK(A) ((unsigned int) ((A) >> 16))
	205
	206	#define SQUASHFS_XATTR_OFFSET(A) ((unsigned int) ((A) & 0xffff))
ffae2cd7 PL	207
	208	/* cached data constants for filesystem */
	209	#define SQUASHFS_CACHED_BLKS 8
	210
	211	#define SQUASHFS_MAX_FILE_SIZE_LOG 64
	212
	213	#define SQUASHFS_MAX_FILE_SIZE (1LL << \
	214	(SQUASHFS_MAX_FILE_SIZE_LOG - 2))
	215
ffae2cd7 PL	216	/* meta index cache */
	217	#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
	218	#define SQUASHFS_META_ENTRIES 127
	219	#define SQUASHFS_META_SLOTS 8
	220
	221	struct meta_entry {
	222	u64 data_block;
	223	unsigned int index_block;
	224	unsigned short offset;
	225	unsigned short pad;
	226	};
	227
	228	struct meta_index {
	229	unsigned int inode_number;
	230	unsigned int offset;
	231	unsigned short entries;
	232	unsigned short skip;
	233	unsigned short locked;
	234	unsigned short pad;
	235	struct meta_entry meta_entry[SQUASHFS_META_ENTRIES];
	236	};
	237
	238
	239	/*
	240	* definitions for structures on disk
	241	*/
dc325678 PL	242	#define ZLIB_COMPRESSION 1
	243	#define LZMA_COMPRESSION 2
	244	#define LZO_COMPRESSION 3
81bb8deb	245	#define XZ_COMPRESSION 4
ffae2cd7 PL	246
	247	struct squashfs_super_block {
	248	__le32 s_magic;
	249	__le32 inodes;
	250	__le32 mkfs_time;
	251	__le32 block_size;
	252	__le32 fragments;
	253	__le16 compression;
	254	__le16 block_log;
	255	__le16 flags;
	256	__le16 no_ids;
	257	__le16 s_major;
	258	__le16 s_minor;
	259	__le64 root_inode;
	260	__le64 bytes_used;
	261	__le64 id_table_start;
4b5397dc	262	__le64 xattr_id_table_start;
ffae2cd7 PL	263	__le64 inode_table_start;
	264	__le64 directory_table_start;
	265	__le64 fragment_table_start;
	266	__le64 lookup_table_start;
	267	};
	268
	269	struct squashfs_dir_index {
	270	__le32 index;
	271	__le32 start_block;
	272	__le32 size;
	273	unsigned char name[0];
	274	};
	275
	276	struct squashfs_base_inode {
	277	__le16 inode_type;
	278	__le16 mode;
	279	__le16 uid;
	280	__le16 guid;
	281	__le32 mtime;
66048c38	282	__le32 inode_number;
ffae2cd7 PL	283	};
	284
	285	struct squashfs_ipc_inode {
	286	__le16 inode_type;
	287	__le16 mode;
	288	__le16 uid;
	289	__le16 guid;
	290	__le32 mtime;
66048c38	291	__le32 inode_number;
ffae2cd7 PL	292	__le32 nlink;
	293	};
	294
67f66cc6 PL	295	struct squashfs_lipc_inode {
	296	__le16 inode_type;
	297	__le16 mode;
	298	__le16 uid;
	299	__le16 guid;
	300	__le32 mtime;
66048c38	301	__le32 inode_number;
67f66cc6 PL	302	__le32 nlink;
	303	__le32 xattr;
	304	};
	305
ffae2cd7 PL	306	struct squashfs_dev_inode {
	307	__le16 inode_type;
	308	__le16 mode;
	309	__le16 uid;
	310	__le16 guid;
	311	__le32 mtime;
66048c38	312	__le32 inode_number;
ffae2cd7 PL	313	__le32 nlink;
	314	__le32 rdev;
	315	};
	316
67f66cc6 PL	317	struct squashfs_ldev_inode {
	318	__le16 inode_type;
	319	__le16 mode;
	320	__le16 uid;
	321	__le16 guid;
	322	__le32 mtime;
66048c38	323	__le32 inode_number;
67f66cc6 PL	324	__le32 nlink;
	325	__le32 rdev;
	326	__le32 xattr;
	327	};
	328
ffae2cd7 PL	329	struct squashfs_symlink_inode {
	330	__le16 inode_type;
	331	__le16 mode;
	332	__le16 uid;
	333	__le16 guid;
	334	__le32 mtime;
66048c38	335	__le32 inode_number;
ffae2cd7 PL	336	__le32 nlink;
	337	__le32 symlink_size;
	338	char symlink[0];
	339	};
	340
	341	struct squashfs_reg_inode {
	342	__le16 inode_type;
	343	__le16 mode;
	344	__le16 uid;
	345	__le16 guid;
	346	__le32 mtime;
66048c38	347	__le32 inode_number;
ffae2cd7 PL	348	__le32 start_block;
	349	__le32 fragment;
	350	__le32 offset;
	351	__le32 file_size;
	352	__le16 block_list[0];
	353	};
	354
	355	struct squashfs_lreg_inode {
	356	__le16 inode_type;
	357	__le16 mode;
	358	__le16 uid;
	359	__le16 guid;
	360	__le32 mtime;
66048c38	361	__le32 inode_number;
ffae2cd7 PL	362	__le64 start_block;
	363	__le64 file_size;
	364	__le64 sparse;
	365	__le32 nlink;
	366	__le32 fragment;
	367	__le32 offset;
	368	__le32 xattr;
	369	__le16 block_list[0];
	370	};
	371
	372	struct squashfs_dir_inode {
	373	__le16 inode_type;
	374	__le16 mode;
	375	__le16 uid;
	376	__le16 guid;
	377	__le32 mtime;
66048c38	378	__le32 inode_number;
ffae2cd7 PL	379	__le32 start_block;
	380	__le32 nlink;
	381	__le16 file_size;
	382	__le16 offset;
	383	__le32 parent_inode;
	384	};
	385
	386	struct squashfs_ldir_inode {
	387	__le16 inode_type;
	388	__le16 mode;
	389	__le16 uid;
	390	__le16 guid;
	391	__le32 mtime;
66048c38	392	__le32 inode_number;
ffae2cd7 PL	393	__le32 nlink;
	394	__le32 file_size;
	395	__le32 start_block;
	396	__le32 parent_inode;
	397	__le16 i_count;
	398	__le16 offset;
	399	__le32 xattr;
	400	struct squashfs_dir_index index[0];
	401	};
	402
	403	union squashfs_inode {
	404	struct squashfs_base_inode base;
	405	struct squashfs_dev_inode dev;
67f66cc6	406	struct squashfs_ldev_inode ldev;
ffae2cd7 PL	407	struct squashfs_symlink_inode symlink;
	408	struct squashfs_reg_inode reg;
	409	struct squashfs_lreg_inode lreg;
	410	struct squashfs_dir_inode dir;
	411	struct squashfs_ldir_inode ldir;
	412	struct squashfs_ipc_inode ipc;
67f66cc6	413	struct squashfs_lipc_inode lipc;
ffae2cd7 PL	414	};
	415
	416	struct squashfs_dir_entry {
	417	__le16 offset;
	418	__le16 inode_number;
	419	__le16 type;
	420	__le16 size;
	421	char name[0];
	422	};
	423
	424	struct squashfs_dir_header {
	425	__le32 count;
	426	__le32 start_block;
	427	__le32 inode_number;
	428	};
	429
	430	struct squashfs_fragment_entry {
	431	__le64 start_block;
	432	__le32 size;
	433	unsigned int unused;
	434	};
	435
f41d207c PL	436	struct squashfs_xattr_entry {
	437	__le16 type;
	438	__le16 size;
	439	char data[0];
	440	};
	441
	442	struct squashfs_xattr_val {
	443	__le32 vsize;
	444	char value[0];
	445	};
	446
4b5397dc PL	447	struct squashfs_xattr_id {
	448	__le64 xattr;
	449	__le32 count;
	450	__le32 size;
	451	};
	452
	453	struct squashfs_xattr_id_table {
	454	__le64 xattr_table_start;
	455	__le32 xattr_ids;
	456	__le32 unused;
	457	};
	458
ffae2cd7	459	#endif