[net-next-2.6.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_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_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)

/* 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

/* 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

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

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_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_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_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)
	49	#define SQUASHFS_INVALID_BLK (-1LL)
	50
	51	/* Filesystem flags */
	52	#define SQUASHFS_NOI 0
	53	#define SQUASHFS_NOD 1
	54	#define SQUASHFS_NOF 3
	55	#define SQUASHFS_NO_FRAG 4
	56	#define SQUASHFS_ALWAYS_FRAG 5
	57	#define SQUASHFS_DUPLICATE 6
	58	#define SQUASHFS_EXPORT 7
	59
	60	#define SQUASHFS_BIT(flag, bit) ((flag >> bit) & 1)
	61
	62	#define SQUASHFS_UNCOMPRESSED_INODES(flags) SQUASHFS_BIT(flags, \
	63	SQUASHFS_NOI)
	64
	65	#define SQUASHFS_UNCOMPRESSED_DATA(flags) SQUASHFS_BIT(flags, \
	66	SQUASHFS_NOD)
	67
	68	#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
	69	SQUASHFS_NOF)
	70
	71	#define SQUASHFS_NO_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
	72	SQUASHFS_NO_FRAG)
	73
	74	#define SQUASHFS_ALWAYS_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
	75	SQUASHFS_ALWAYS_FRAG)
	76
	77	#define SQUASHFS_DUPLICATES(flags) SQUASHFS_BIT(flags, \
	78	SQUASHFS_DUPLICATE)
	79
	80	#define SQUASHFS_EXPORTABLE(flags) SQUASHFS_BIT(flags, \
	81	SQUASHFS_EXPORT)
	82
	83	/* Max number of types and file types */
	84	#define SQUASHFS_DIR_TYPE 1
	85	#define SQUASHFS_REG_TYPE 2
	86	#define SQUASHFS_SYMLINK_TYPE 3
	87	#define SQUASHFS_BLKDEV_TYPE 4
	88	#define SQUASHFS_CHRDEV_TYPE 5
	89	#define SQUASHFS_FIFO_TYPE 6
	90	#define SQUASHFS_SOCKET_TYPE 7
	91	#define SQUASHFS_LDIR_TYPE 8
	92	#define SQUASHFS_LREG_TYPE 9
93	#define SQUASHFS_LSYMLINK_TYPE 10
94	#define SQUASHFS_LBLKDEV_TYPE 11
95	#define SQUASHFS_LCHRDEV_TYPE 12
96	#define SQUASHFS_LFIFO_TYPE 13
97	#define SQUASHFS_LSOCKET_TYPE 14
98
99	/* Flag whether block is compressed or uncompressed, bit is set if block is
100	* uncompressed */
101	#define SQUASHFS_COMPRESSED_BIT (1 << 15)
102
103	#define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
104	(B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT)
105
106	#define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT))
107
108	#define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24)
109
110	#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) ((B) & \
111	~SQUASHFS_COMPRESSED_BIT_BLOCK)
112
113	#define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
114
115	/*
116	* Inode number ops. Inodes consist of a compressed block number, and an
117	* uncompressed offset within that block
118	*/
119	#define SQUASHFS_INODE_BLK(A) ((unsigned int) ((A) >> 16))
120
121	#define SQUASHFS_INODE_OFFSET(A) ((unsigned int) ((A) & 0xffff))
122
123	#define SQUASHFS_MKINODE(A, B) ((long long)(((long long) (A)\
124	<< 16) + (B)))
125
126	/* Translate between VFS mode and squashfs mode */
127	#define SQUASHFS_MODE(A) ((A) & 0xfff)
128
129	/* fragment and fragment table defines */
130	#define SQUASHFS_FRAGMENT_BYTES(A) \
131	((A) * sizeof(struct squashfs_fragment_entry))
132
133	#define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \
134	SQUASHFS_METADATA_SIZE)
135
136	#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \
137	SQUASHFS_METADATA_SIZE)
138
139	#define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \
140	SQUASHFS_METADATA_SIZE - 1) / \
141	SQUASHFS_METADATA_SIZE)
142
143	#define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\
144	sizeof(u64))
145
146	/* inode lookup table defines */
147	#define SQUASHFS_LOOKUP_BYTES(A) ((A) * sizeof(u64))
148
149	#define SQUASHFS_LOOKUP_BLOCK(A) (SQUASHFS_LOOKUP_BYTES(A) / \
150	SQUASHFS_METADATA_SIZE)
151
152	#define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \
153	SQUASHFS_METADATA_SIZE)
154
155	#define SQUASHFS_LOOKUP_BLOCKS(A) ((SQUASHFS_LOOKUP_BYTES(A) + \
156	SQUASHFS_METADATA_SIZE - 1) / \
157	SQUASHFS_METADATA_SIZE)
158
159	#define SQUASHFS_LOOKUP_BLOCK_BYTES(A) (SQUASHFS_LOOKUP_BLOCKS(A) *\
160	sizeof(u64))
161
162	/* uid/gid lookup table defines */
163	#define SQUASHFS_ID_BYTES(A) ((A) * sizeof(unsigned int))
164
165	#define SQUASHFS_ID_BLOCK(A) (SQUASHFS_ID_BYTES(A) / \
166	SQUASHFS_METADATA_SIZE)
167
168	#define SQUASHFS_ID_BLOCK_OFFSET(A) (SQUASHFS_ID_BYTES(A) % \
169	SQUASHFS_METADATA_SIZE)
170
171	#define SQUASHFS_ID_BLOCKS(A) ((SQUASHFS_ID_BYTES(A) + \
172	SQUASHFS_METADATA_SIZE - 1) / \
173	SQUASHFS_METADATA_SIZE)
174
175	#define SQUASHFS_ID_BLOCK_BYTES(A) (SQUASHFS_ID_BLOCKS(A) *\
176	sizeof(u64))
4b5397dc PL	177	/* xattr id lookup table defines */
	178	#define SQUASHFS_XATTR_BYTES(A) ((A) * sizeof(struct squashfs_xattr_id))
	179
	180	#define SQUASHFS_XATTR_BLOCK(A) (SQUASHFS_XATTR_BYTES(A) / \
	181	SQUASHFS_METADATA_SIZE)
	182
	183	#define SQUASHFS_XATTR_BLOCK_OFFSET(A) (SQUASHFS_XATTR_BYTES(A) % \
	184	SQUASHFS_METADATA_SIZE)
	185
	186	#define SQUASHFS_XATTR_BLOCKS(A) ((SQUASHFS_XATTR_BYTES(A) + \
	187	SQUASHFS_METADATA_SIZE - 1) / \
	188	SQUASHFS_METADATA_SIZE)
	189
	190	#define SQUASHFS_XATTR_BLOCK_BYTES(A) (SQUASHFS_XATTR_BLOCKS(A) *\
	191	sizeof(u64))
	192	#define SQUASHFS_XATTR_BLK(A) ((unsigned int) ((A) >> 16))
	193
	194	#define SQUASHFS_XATTR_OFFSET(A) ((unsigned int) ((A) & 0xffff))
ffae2cd7 PL	195
	196	/* cached data constants for filesystem */
	197	#define SQUASHFS_CACHED_BLKS 8
	198
	199	#define SQUASHFS_MAX_FILE_SIZE_LOG 64
	200
	201	#define SQUASHFS_MAX_FILE_SIZE (1LL << \
	202	(SQUASHFS_MAX_FILE_SIZE_LOG - 2))
	203
ffae2cd7 PL	204	/* meta index cache */
	205	#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
	206	#define SQUASHFS_META_ENTRIES 127
	207	#define SQUASHFS_META_SLOTS 8
	208
	209	struct meta_entry {
	210	u64 data_block;
	211	unsigned int index_block;
	212	unsigned short offset;
	213	unsigned short pad;
	214	};
	215
	216	struct meta_index {
	217	unsigned int inode_number;
	218	unsigned int offset;
	219	unsigned short entries;
	220	unsigned short skip;
	221	unsigned short locked;
	222	unsigned short pad;
	223	struct meta_entry meta_entry[SQUASHFS_META_ENTRIES];
	224	};
	225
	226
	227	/*
	228	* definitions for structures on disk
	229	*/
dc325678 PL	230	#define ZLIB_COMPRESSION 1
	231	#define LZMA_COMPRESSION 2
	232	#define LZO_COMPRESSION 3
ffae2cd7 PL	233
	234	struct squashfs_super_block {
	235	__le32 s_magic;
	236	__le32 inodes;
	237	__le32 mkfs_time;
	238	__le32 block_size;
	239	__le32 fragments;
	240	__le16 compression;
	241	__le16 block_log;
	242	__le16 flags;
	243	__le16 no_ids;
	244	__le16 s_major;
	245	__le16 s_minor;
	246	__le64 root_inode;
	247	__le64 bytes_used;
	248	__le64 id_table_start;
4b5397dc	249	__le64 xattr_id_table_start;
ffae2cd7 PL	250	__le64 inode_table_start;
	251	__le64 directory_table_start;
	252	__le64 fragment_table_start;
	253	__le64 lookup_table_start;
	254	};
	255
	256	struct squashfs_dir_index {
	257	__le32 index;
	258	__le32 start_block;
	259	__le32 size;
	260	unsigned char name[0];
	261	};
	262
	263	struct squashfs_base_inode {
	264	__le16 inode_type;
	265	__le16 mode;
	266	__le16 uid;
	267	__le16 guid;
	268	__le32 mtime;
	269	__le32 inode_number;
	270	};
	271
	272	struct squashfs_ipc_inode {
	273	__le16 inode_type;
	274	__le16 mode;
	275	__le16 uid;
	276	__le16 guid;
	277	__le32 mtime;
	278	__le32 inode_number;
	279	__le32 nlink;
	280	};
	281
	282	struct squashfs_dev_inode {
	283	__le16 inode_type;
	284	__le16 mode;
	285	__le16 uid;
	286	__le16 guid;
	287	__le32 mtime;
	288	__le32 inode_number;
	289	__le32 nlink;
	290	__le32 rdev;
	291	};
	292
	293	struct squashfs_symlink_inode {
	294	__le16 inode_type;
	295	__le16 mode;
	296	__le16 uid;
	297	__le16 guid;
	298	__le32 mtime;
	299	__le32 inode_number;
	300	__le32 nlink;
	301	__le32 symlink_size;
	302	char symlink[0];
	303	};
	304
	305	struct squashfs_reg_inode {
	306	__le16 inode_type;
	307	__le16 mode;
	308	__le16 uid;
	309	__le16 guid;
	310	__le32 mtime;
	311	__le32 inode_number;
	312	__le32 start_block;
	313	__le32 fragment;
314	__le32 offset;
315	__le32 file_size;
316	__le16 block_list[0];
317	};
318
319	struct squashfs_lreg_inode {
320	__le16 inode_type;
321	__le16 mode;
322	__le16 uid;
323	__le16 guid;
324	__le32 mtime;
325	__le32 inode_number;
326	__le64 start_block;
327	__le64 file_size;
328	__le64 sparse;
329	__le32 nlink;
330	__le32 fragment;
331	__le32 offset;
332	__le32 xattr;
333	__le16 block_list[0];
334	};
335
336	struct squashfs_dir_inode {
337	__le16 inode_type;
338	__le16 mode;
339	__le16 uid;
340	__le16 guid;
341	__le32 mtime;
342	__le32 inode_number;
343	__le32 start_block;
344	__le32 nlink;
345	__le16 file_size;
346	__le16 offset;
347	__le32 parent_inode;
348	};
349
350	struct squashfs_ldir_inode {
351	__le16 inode_type;
352	__le16 mode;
353	__le16 uid;
354	__le16 guid;
355	__le32 mtime;
356	__le32 inode_number;
357	__le32 nlink;
358	__le32 file_size;
359	__le32 start_block;
360	__le32 parent_inode;
361	__le16 i_count;
362	__le16 offset;
363	__le32 xattr;
364	struct squashfs_dir_index index[0];
365	};
366
367	union squashfs_inode {
368	struct squashfs_base_inode base;
369	struct squashfs_dev_inode dev;
370	struct squashfs_symlink_inode symlink;
371	struct squashfs_reg_inode reg;
372	struct squashfs_lreg_inode lreg;
373	struct squashfs_dir_inode dir;
374	struct squashfs_ldir_inode ldir;
375	struct squashfs_ipc_inode ipc;
376	};
377
378	struct squashfs_dir_entry {
379	__le16 offset;
380	__le16 inode_number;
381	__le16 type;
382	__le16 size;
383	char name[0];
384	};
385
386	struct squashfs_dir_header {
387	__le32 count;
388	__le32 start_block;
389	__le32 inode_number;
390	};
391
392	struct squashfs_fragment_entry {
393	__le64 start_block;
394	__le32 size;
395	unsigned int unused;
396	};
397
4b5397dc PL	398	struct squashfs_xattr_id {
	399	__le64 xattr;
	400	__le32 count;
	401	__le32 size;
	402	};
	403
	404	struct squashfs_xattr_id_table {
	405	__le64 xattr_table_start;
	406	__le32 xattr_ids;
	407	__le32 unused;
	408	};
	409
ffae2cd7	410	#endif