[mirror_ubuntu-zesty-kernel.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)

/* 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)))

/* 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
ffae2cd7 PL	90	/* Max number of types and file types */
	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
f41d207c PL	106	/* Xattr types */
	107	#define SQUASHFS_XATTR_USER 0
	108	#define SQUASHFS_XATTR_TRUSTED 1
	109	#define SQUASHFS_XATTR_SECURITY 2
	110	#define SQUASHFS_XATTR_VALUE_OOL 256
	111	#define SQUASHFS_XATTR_PREFIX_MASK 0xff
	112
ffae2cd7 PL	113	/* Flag whether block is compressed or uncompressed, bit is set if block is
	114	* uncompressed */
	115	#define SQUASHFS_COMPRESSED_BIT (1 << 15)
	116
	117	#define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
	118	(B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT)
	119
	120	#define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT))
	121
	122	#define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24)
	123
	124	#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) ((B) & \
	125	~SQUASHFS_COMPRESSED_BIT_BLOCK)
	126
	127	#define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
	128
	129	/*
	130	* Inode number ops. Inodes consist of a compressed block number, and an
	131	* uncompressed offset within that block
	132	*/
	133	#define SQUASHFS_INODE_BLK(A) ((unsigned int) ((A) >> 16))
	134
	135	#define SQUASHFS_INODE_OFFSET(A) ((unsigned int) ((A) & 0xffff))
	136
	137	#define SQUASHFS_MKINODE(A, B) ((long long)(((long long) (A)\
	138	<< 16) + (B)))
	139
ffae2cd7 PL	140	/* fragment and fragment table defines */
	141	#define SQUASHFS_FRAGMENT_BYTES(A) \
	142	((A) * sizeof(struct squashfs_fragment_entry))
	143
	144	#define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \
	145	SQUASHFS_METADATA_SIZE)
	146
	147	#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \
	148	SQUASHFS_METADATA_SIZE)
	149
	150	#define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \
	151	SQUASHFS_METADATA_SIZE - 1) / \
	152	SQUASHFS_METADATA_SIZE)
	153
	154	#define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\
	155	sizeof(u64))
	156
	157	/* inode lookup table defines */
	158	#define SQUASHFS_LOOKUP_BYTES(A) ((A) * sizeof(u64))
	159
	160	#define SQUASHFS_LOOKUP_BLOCK(A) (SQUASHFS_LOOKUP_BYTES(A) / \
	161	SQUASHFS_METADATA_SIZE)
	162
	163	#define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \
	164	SQUASHFS_METADATA_SIZE)
	165
	166	#define SQUASHFS_LOOKUP_BLOCKS(A) ((SQUASHFS_LOOKUP_BYTES(A) + \
	167	SQUASHFS_METADATA_SIZE - 1) / \
	168	SQUASHFS_METADATA_SIZE)
	169
	170	#define SQUASHFS_LOOKUP_BLOCK_BYTES(A) (SQUASHFS_LOOKUP_BLOCKS(A) *\
	171	sizeof(u64))
	172
	173	/* uid/gid lookup table defines */
	174	#define SQUASHFS_ID_BYTES(A) ((A) * sizeof(unsigned int))
	175
	176	#define SQUASHFS_ID_BLOCK(A) (SQUASHFS_ID_BYTES(A) / \
	177	SQUASHFS_METADATA_SIZE)
	178
	179	#define SQUASHFS_ID_BLOCK_OFFSET(A) (SQUASHFS_ID_BYTES(A) % \
	180	SQUASHFS_METADATA_SIZE)
	181
	182	#define SQUASHFS_ID_BLOCKS(A) ((SQUASHFS_ID_BYTES(A) + \
	183	SQUASHFS_METADATA_SIZE - 1) / \
	184	SQUASHFS_METADATA_SIZE)
	185
	186	#define SQUASHFS_ID_BLOCK_BYTES(A) (SQUASHFS_ID_BLOCKS(A) *\
	187	sizeof(u64))
4b5397dc PL	188	/* xattr id lookup table defines */
	189	#define SQUASHFS_XATTR_BYTES(A) ((A) * sizeof(struct squashfs_xattr_id))
	190
	191	#define SQUASHFS_XATTR_BLOCK(A) (SQUASHFS_XATTR_BYTES(A) / \
	192	SQUASHFS_METADATA_SIZE)
	193
	194	#define SQUASHFS_XATTR_BLOCK_OFFSET(A) (SQUASHFS_XATTR_BYTES(A) % \
	195	SQUASHFS_METADATA_SIZE)
	196
	197	#define SQUASHFS_XATTR_BLOCKS(A) ((SQUASHFS_XATTR_BYTES(A) + \
	198	SQUASHFS_METADATA_SIZE - 1) / \
	199	SQUASHFS_METADATA_SIZE)
	200
	201	#define SQUASHFS_XATTR_BLOCK_BYTES(A) (SQUASHFS_XATTR_BLOCKS(A) *\
	202	sizeof(u64))
	203	#define SQUASHFS_XATTR_BLK(A) ((unsigned int) ((A) >> 16))
	204
	205	#define SQUASHFS_XATTR_OFFSET(A) ((unsigned int) ((A) & 0xffff))
ffae2cd7 PL	206
	207	/* cached data constants for filesystem */
	208	#define SQUASHFS_CACHED_BLKS 8
	209
ffae2cd7 PL	210	/* meta index cache */
	211	#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
	212	#define SQUASHFS_META_ENTRIES 127
	213	#define SQUASHFS_META_SLOTS 8
	214
	215	struct meta_entry {
	216	u64 data_block;
	217	unsigned int index_block;
	218	unsigned short offset;
	219	unsigned short pad;
	220	};
	221
	222	struct meta_index {
	223	unsigned int inode_number;
	224	unsigned int offset;
	225	unsigned short entries;
	226	unsigned short skip;
	227	unsigned short locked;
	228	unsigned short pad;
	229	struct meta_entry meta_entry[SQUASHFS_META_ENTRIES];
	230	};
	231
	232
	233	/*
	234	* definitions for structures on disk
	235	*/
dc325678 PL	236	#define ZLIB_COMPRESSION 1
	237	#define LZMA_COMPRESSION 2
	238	#define LZO_COMPRESSION 3
81bb8deb	239	#define XZ_COMPRESSION 4
ffae2cd7 PL	240
	241	struct squashfs_super_block {
	242	__le32 s_magic;
	243	__le32 inodes;
	244	__le32 mkfs_time;
	245	__le32 block_size;
	246	__le32 fragments;
	247	__le16 compression;
	248	__le16 block_log;
	249	__le16 flags;
	250	__le16 no_ids;
	251	__le16 s_major;
	252	__le16 s_minor;
	253	__le64 root_inode;
	254	__le64 bytes_used;
	255	__le64 id_table_start;
4b5397dc	256	__le64 xattr_id_table_start;
ffae2cd7 PL	257	__le64 inode_table_start;
	258	__le64 directory_table_start;
	259	__le64 fragment_table_start;
	260	__le64 lookup_table_start;
	261	};
	262
	263	struct squashfs_dir_index {
	264	__le32 index;
	265	__le32 start_block;
	266	__le32 size;
	267	unsigned char name[0];
	268	};
	269
	270	struct squashfs_base_inode {
	271	__le16 inode_type;
	272	__le16 mode;
	273	__le16 uid;
	274	__le16 guid;
	275	__le32 mtime;
66048c38	276	__le32 inode_number;
ffae2cd7 PL	277	};
	278
	279	struct squashfs_ipc_inode {
	280	__le16 inode_type;
	281	__le16 mode;
	282	__le16 uid;
	283	__le16 guid;
	284	__le32 mtime;
66048c38	285	__le32 inode_number;
ffae2cd7 PL	286	__le32 nlink;
	287	};
	288
67f66cc6 PL	289	struct squashfs_lipc_inode {
	290	__le16 inode_type;
	291	__le16 mode;
	292	__le16 uid;
	293	__le16 guid;
	294	__le32 mtime;
66048c38	295	__le32 inode_number;
67f66cc6 PL	296	__le32 nlink;
	297	__le32 xattr;
	298	};
	299
ffae2cd7 PL	300	struct squashfs_dev_inode {
	301	__le16 inode_type;
	302	__le16 mode;
	303	__le16 uid;
	304	__le16 guid;
	305	__le32 mtime;
66048c38	306	__le32 inode_number;
ffae2cd7 PL	307	__le32 nlink;
	308	__le32 rdev;
	309	};
	310
67f66cc6 PL	311	struct squashfs_ldev_inode {
	312	__le16 inode_type;
	313	__le16 mode;
	314	__le16 uid;
	315	__le16 guid;
	316	__le32 mtime;
66048c38	317	__le32 inode_number;
67f66cc6 PL	318	__le32 nlink;
	319	__le32 rdev;
	320	__le32 xattr;
	321	};
	322
ffae2cd7 PL	323	struct squashfs_symlink_inode {
	324	__le16 inode_type;
	325	__le16 mode;
	326	__le16 uid;
	327	__le16 guid;
	328	__le32 mtime;
66048c38	329	__le32 inode_number;
ffae2cd7 PL	330	__le32 nlink;
	331	__le32 symlink_size;
	332	char symlink[0];
	333	};
	334
	335	struct squashfs_reg_inode {
	336	__le16 inode_type;
	337	__le16 mode;
	338	__le16 uid;
	339	__le16 guid;
	340	__le32 mtime;
66048c38	341	__le32 inode_number;
ffae2cd7 PL	342	__le32 start_block;
	343	__le32 fragment;
	344	__le32 offset;
	345	__le32 file_size;
	346	__le16 block_list[0];
	347	};
	348
	349	struct squashfs_lreg_inode {
	350	__le16 inode_type;
	351	__le16 mode;
	352	__le16 uid;
	353	__le16 guid;
	354	__le32 mtime;
66048c38	355	__le32 inode_number;
ffae2cd7 PL	356	__le64 start_block;
	357	__le64 file_size;
	358	__le64 sparse;
	359	__le32 nlink;
	360	__le32 fragment;
	361	__le32 offset;
	362	__le32 xattr;
	363	__le16 block_list[0];
	364	};
	365
	366	struct squashfs_dir_inode {
	367	__le16 inode_type;
	368	__le16 mode;
	369	__le16 uid;
	370	__le16 guid;
	371	__le32 mtime;
66048c38	372	__le32 inode_number;
ffae2cd7 PL	373	__le32 start_block;
	374	__le32 nlink;
	375	__le16 file_size;
	376	__le16 offset;
	377	__le32 parent_inode;
	378	};
	379
	380	struct squashfs_ldir_inode {
	381	__le16 inode_type;
	382	__le16 mode;
	383	__le16 uid;
	384	__le16 guid;
	385	__le32 mtime;
66048c38	386	__le32 inode_number;
ffae2cd7 PL	387	__le32 nlink;
	388	__le32 file_size;
	389	__le32 start_block;
	390	__le32 parent_inode;
	391	__le16 i_count;
	392	__le16 offset;
	393	__le32 xattr;
	394	struct squashfs_dir_index index[0];
	395	};
	396
	397	union squashfs_inode {
	398	struct squashfs_base_inode base;
	399	struct squashfs_dev_inode dev;
67f66cc6	400	struct squashfs_ldev_inode ldev;
ffae2cd7 PL	401	struct squashfs_symlink_inode symlink;
	402	struct squashfs_reg_inode reg;
	403	struct squashfs_lreg_inode lreg;
	404	struct squashfs_dir_inode dir;
	405	struct squashfs_ldir_inode ldir;
	406	struct squashfs_ipc_inode ipc;
67f66cc6	407	struct squashfs_lipc_inode lipc;
ffae2cd7 PL	408	};
	409
	410	struct squashfs_dir_entry {
	411	__le16 offset;
	412	__le16 inode_number;
	413	__le16 type;
	414	__le16 size;
	415	char name[0];
	416	};
	417
	418	struct squashfs_dir_header {
	419	__le32 count;
	420	__le32 start_block;
	421	__le32 inode_number;
	422	};
	423
	424	struct squashfs_fragment_entry {
	425	__le64 start_block;
	426	__le32 size;
	427	unsigned int unused;
	428	};
	429
f41d207c PL	430	struct squashfs_xattr_entry {
	431	__le16 type;
	432	__le16 size;
	433	char data[0];
	434	};
	435
	436	struct squashfs_xattr_val {
	437	__le32 vsize;
	438	char value[0];
	439	};
	440
4b5397dc PL	441	struct squashfs_xattr_id {
	442	__le64 xattr;
	443	__le32 count;
	444	__le32 size;
	445	};
	446
	447	struct squashfs_xattr_id_table {
	448	__le64 xattr_table_start;
	449	__le32 xattr_ids;
	450	__le32 unused;
	451	};
	452
ffae2cd7	453	#endif