464 lines
11 KiB
C
464 lines
11 KiB
C
|
#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))
|
||
|
|
|
||
|
|
static inline int squashfs_block_size(__le32 raw)
|
||
|
|
{
|
||
|
|
u32 size = le32_to_cpu(raw);
|
||
|
|
return (size >> 25) ? -EIO : size;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Inode number ops. Inodes consist of a compressed block number, and an
|
||
|
|
* uncompressed offset within that block
|
||
|
|
*/
|
||
|
|
#define SQUASHFS_INODE_BLK(A) ((unsigned int) ((A) >> 16))
|
||
|
|
|
||
|
|
#define SQUASHFS_INODE_OFFSET(A) ((unsigned int) ((A) & 0xffff))
|
||
|
|
|
||
|
|
#define SQUASHFS_MKINODE(A, B) ((long long)(((long long) (A)\
|
||
|
|
<< 16) + (B)))
|
||
|
|
|
||
|
|
/* fragment and fragment table defines */
|
||
|
|
#define SQUASHFS_FRAGMENT_BYTES(A) \
|
||
|
|
((A) * sizeof(struct squashfs_fragment_entry))
|
||
|
|
|
||
|
|
#define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \
|
||
|
|
SQUASHFS_METADATA_SIZE)
|
||
|
|
|
||
|
|
#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \
|
||
|
|
SQUASHFS_METADATA_SIZE)
|
||
|
|
|
||
|
|
#define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \
|
||
|
|
SQUASHFS_METADATA_SIZE - 1) / \
|
||
|
|
SQUASHFS_METADATA_SIZE)
|
||
|
|
|
||
|
|
#define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\
|
||
|
|
sizeof(u64))
|
||
|
|
|
||
|
|
/* inode lookup table defines */
|
||
|
|
#define SQUASHFS_LOOKUP_BYTES(A) ((A) * sizeof(u64))
|
||
|
|
|
||
|
|
#define SQUASHFS_LOOKUP_BLOCK(A) (SQUASHFS_LOOKUP_BYTES(A) / \
|
||
|
|
SQUASHFS_METADATA_SIZE)
|
||
|
|
|
||
|
|
#define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \
|
||
|
|
SQUASHFS_METADATA_SIZE)
|
||
|
|
|
||
|
|
#define SQUASHFS_LOOKUP_BLOCKS(A) ((SQUASHFS_LOOKUP_BYTES(A) + \
|
||
|
|
SQUASHFS_METADATA_SIZE - 1) / \
|
||
|
|
SQUASHFS_METADATA_SIZE)
|
||
|
|
|
||
|
|
#define SQUASHFS_LOOKUP_BLOCK_BYTES(A) (SQUASHFS_LOOKUP_BLOCKS(A) *\
|
||
|
|
sizeof(u64))
|
||
|
|
|
||
|
|
/* uid/gid lookup table defines */
|
||
|
|
#define SQUASHFS_ID_BYTES(A) ((A) * sizeof(unsigned int))
|
||
|
|
|
||
|
|
#define SQUASHFS_ID_BLOCK(A) (SQUASHFS_ID_BYTES(A) / \
|
||
|
|
SQUASHFS_METADATA_SIZE)
|
||
|
|
|
||
|
|
#define SQUASHFS_ID_BLOCK_OFFSET(A) (SQUASHFS_ID_BYTES(A) % \
|
||
|
|
SQUASHFS_METADATA_SIZE)
|
||
|
|
|
||
|
|
#define SQUASHFS_ID_BLOCKS(A) ((SQUASHFS_ID_BYTES(A) + \
|
||
|
|
SQUASHFS_METADATA_SIZE - 1) / \
|
||
|
|
SQUASHFS_METADATA_SIZE)
|
||
|
|
|
||
|
|
#define SQUASHFS_ID_BLOCK_BYTES(A) (SQUASHFS_ID_BLOCKS(A) *\
|
||
|
|
sizeof(u64))
|
||
|
|
/* xattr id lookup table defines */
|
||
|
|
#define SQUASHFS_XATTR_BYTES(A) ((A) * sizeof(struct squashfs_xattr_id))
|
||
|
|
|
||
|
|
#define SQUASHFS_XATTR_BLOCK(A) (SQUASHFS_XATTR_BYTES(A) / \
|
||
|
|
SQUASHFS_METADATA_SIZE)
|
||
|
|
|
||
|
|
#define SQUASHFS_XATTR_BLOCK_OFFSET(A) (SQUASHFS_XATTR_BYTES(A) % \
|
||
|
|
SQUASHFS_METADATA_SIZE)
|
||
|
|
|
||
|
|
#define SQUASHFS_XATTR_BLOCKS(A) ((SQUASHFS_XATTR_BYTES(A) + \
|
||
|
|
SQUASHFS_METADATA_SIZE - 1) / \
|
||
|
|
SQUASHFS_METADATA_SIZE)
|
||
|
|
|
||
|
|
#define SQUASHFS_XATTR_BLOCK_BYTES(A) (SQUASHFS_XATTR_BLOCKS(A) *\
|
||
|
|
sizeof(u64))
|
||
|
|
#define SQUASHFS_XATTR_BLK(A) ((unsigned int) ((A) >> 16))
|
||
|
|
|
||
|
|
#define SQUASHFS_XATTR_OFFSET(A) ((unsigned int) ((A) & 0xffff))
|
||
|
|
|
||
|
|
/* cached data constants for filesystem */
|
||
|
|
#define SQUASHFS_CACHED_BLKS 8
|
||
|
|
|
||
|
|
/* meta index cache */
|
||
|
|
#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
|
||
|
|
#define SQUASHFS_META_ENTRIES 127
|
||
|
|
#define SQUASHFS_META_SLOTS 8
|
||
|
|
|
||
|
|
struct meta_entry {
|
||
|
|
u64 data_block;
|
||
|
|
unsigned int index_block;
|
||
|
|
unsigned short offset;
|
||
|
|
unsigned short pad;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct meta_index {
|
||
|
|
unsigned int inode_number;
|
||
|
|
unsigned int offset;
|
||
|
|
unsigned short entries;
|
||
|
|
unsigned short skip;
|
||
|
|
unsigned short locked;
|
||
|
|
unsigned short pad;
|
||
|
|
struct meta_entry meta_entry[SQUASHFS_META_ENTRIES];
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* definitions for structures on disk
|
||
|
|
*/
|
||
|
|
#define ZLIB_COMPRESSION 1
|
||
|
|
#define LZMA_COMPRESSION 2
|
||
|
|
#define LZO_COMPRESSION 3
|
||
|
|
#define XZ_COMPRESSION 4
|
||
|
|
#define LZ4_COMPRESSION 5
|
||
|
|
|
||
|
|
struct squashfs_super_block {
|
||
|
|
__le32 s_magic;
|
||
|
|
__le32 inodes;
|
||
|
|
__le32 mkfs_time;
|
||
|
|
__le32 block_size;
|
||
|
|
__le32 fragments;
|
||
|
|
__le16 compression;
|
||
|
|
__le16 block_log;
|
||
|
|
__le16 flags;
|
||
|
|
__le16 no_ids;
|
||
|
|
__le16 s_major;
|
||
|
|
__le16 s_minor;
|
||
|
|
__le64 root_inode;
|
||
|
|
__le64 bytes_used;
|
||
|
|
__le64 id_table_start;
|
||
|
|
__le64 xattr_id_table_start;
|
||
|
|
__le64 inode_table_start;
|
||
|
|
__le64 directory_table_start;
|
||
|
|
__le64 fragment_table_start;
|
||
|
|
__le64 lookup_table_start;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct squashfs_dir_index {
|
||
|
|
__le32 index;
|
||
|
|
__le32 start_block;
|
||
|
|
__le32 size;
|
||
|
|
unsigned char name[0];
|
||
|
|
};
|
||
|
|
|
||
|
|
struct squashfs_base_inode {
|
||
|
|
__le16 inode_type;
|
||
|
|
__le16 mode;
|
||
|
|
__le16 uid;
|
||
|
|
__le16 guid;
|
||
|
|
__le32 mtime;
|
||
|
|
__le32 inode_number;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct squashfs_ipc_inode {
|
||
|
|
__le16 inode_type;
|
||
|
|
__le16 mode;
|
||
|
|
__le16 uid;
|
||
|
|
__le16 guid;
|
||
|
|
__le32 mtime;
|
||
|
|
__le32 inode_number;
|
||
|
|
__le32 nlink;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct squashfs_lipc_inode {
|
||
|
|
__le16 inode_type;
|
||
|
|
__le16 mode;
|
||
|
|
__le16 uid;
|
||
|
|
__le16 guid;
|
||
|
|
__le32 mtime;
|
||
|
|
__le32 inode_number;
|
||
|
|
__le32 nlink;
|
||
|
|
__le32 xattr;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct squashfs_dev_inode {
|
||
|
|
__le16 inode_type;
|
||
|
|
__le16 mode;
|
||
|
|
__le16 uid;
|
||
|
|
__le16 guid;
|
||
|
|
__le32 mtime;
|
||
|
|
__le32 inode_number;
|
||
|
|
__le32 nlink;
|
||
|
|
__le32 rdev;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct squashfs_ldev_inode {
|
||
|
|
__le16 inode_type;
|
||
|
|
__le16 mode;
|
||
|
|
__le16 uid;
|
||
|
|
__le16 guid;
|
||
|
|
__le32 mtime;
|
||
|
|
__le32 inode_number;
|
||
|
|
__le32 nlink;
|
||
|
|
__le32 rdev;
|
||
|
|
__le32 xattr;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct squashfs_symlink_inode {
|
||
|
|
__le16 inode_type;
|
||
|
|
__le16 mode;
|
||
|
|
__le16 uid;
|
||
|
|
__le16 guid;
|
||
|
|
__le32 mtime;
|
||
|
|
__le32 inode_number;
|
||
|
|
__le32 nlink;
|
||
|
|
__le32 symlink_size;
|
||
|
|
char symlink[0];
|
||
|
|
};
|
||
|
|
|
||
|
|
struct squashfs_reg_inode {
|
||
|
|
__le16 inode_type;
|
||
|
|
__le16 mode;
|
||
|
|
__le16 uid;
|
||
|
|
__le16 guid;
|
||
|
|
__le32 mtime;
|
||
|
|
__le32 inode_number;
|
||
|
|
__le32 start_block;
|
||
|
|
__le32 fragment;
|
||
|
|
__le32 offset;
|
||
|
|
__le32 file_size;
|
||
|
|
__le16 block_list[0];
|
||
|
|
};
|
||
|
|
|
||
|
|
struct squashfs_lreg_inode {
|
||
|
|
__le16 inode_type;
|
||
|
|
__le16 mode;
|
||
|
|
__le16 uid;
|
||
|
|
__le16 guid;
|
||
|
|
__le32 mtime;
|
||
|
|
__le32 inode_number;
|
||
|
|
__le64 start_block;
|
||
|
|
__le64 file_size;
|
||
|
|
__le64 sparse;
|
||
|
|
__le32 nlink;
|
||
|
|
__le32 fragment;
|
||
|
|
__le32 offset;
|
||
|
|
__le32 xattr;
|
||
|
|
__le16 block_list[0];
|
||
|
|
};
|
||
|
|
|
||
|
|
struct squashfs_dir_inode {
|
||
|
|
__le16 inode_type;
|
||
|
|
__le16 mode;
|
||
|
|
__le16 uid;
|
||
|
|
__le16 guid;
|
||
|
|
__le32 mtime;
|
||
|
|
__le32 inode_number;
|
||
|
|
__le32 start_block;
|
||
|
|
__le32 nlink;
|
||
|
|
__le16 file_size;
|
||
|
|
__le16 offset;
|
||
|
|
__le32 parent_inode;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct squashfs_ldir_inode {
|
||
|
|
__le16 inode_type;
|
||
|
|
__le16 mode;
|
||
|
|
__le16 uid;
|
||
|
|
__le16 guid;
|
||
|
|
__le32 mtime;
|
||
|
|
__le32 inode_number;
|
||
|
|
__le32 nlink;
|
||
|
|
__le32 file_size;
|
||
|
|
__le32 start_block;
|
||
|
|
__le32 parent_inode;
|
||
|
|
__le16 i_count;
|
||
|
|
__le16 offset;
|
||
|
|
__le32 xattr;
|
||
|
|
struct squashfs_dir_index index[0];
|
||
|
|
};
|
||
|
|
|
||
|
|
union squashfs_inode {
|
||
|
|
struct squashfs_base_inode base;
|
||
|
|
struct squashfs_dev_inode dev;
|
||
|
|
struct squashfs_ldev_inode ldev;
|
||
|
|
struct squashfs_symlink_inode symlink;
|
||
|
|
struct squashfs_reg_inode reg;
|
||
|
|
struct squashfs_lreg_inode lreg;
|
||
|
|
struct squashfs_dir_inode dir;
|
||
|
|
struct squashfs_ldir_inode ldir;
|
||
|
|
struct squashfs_ipc_inode ipc;
|
||
|
|
struct squashfs_lipc_inode lipc;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct squashfs_dir_entry {
|
||
|
|
__le16 offset;
|
||
|
|
__le16 inode_number;
|
||
|
|
__le16 type;
|
||
|
|
__le16 size;
|
||
|
|
char name[0];
|
||
|
|
};
|
||
|
|
|
||
|
|
struct squashfs_dir_header {
|
||
|
|
__le32 count;
|
||
|
|
__le32 start_block;
|
||
|
|
__le32 inode_number;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct squashfs_fragment_entry {
|
||
|
|
__le64 start_block;
|
||
|
|
__le32 size;
|
||
|
|
unsigned int unused;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct squashfs_xattr_entry {
|
||
|
|
__le16 type;
|
||
|
|
__le16 size;
|
||
|
|
char data[0];
|
||
|
|
};
|
||
|
|
|
||
|
|
struct squashfs_xattr_val {
|
||
|
|
__le32 vsize;
|
||
|
|
char value[0];
|
||
|
|
};
|
||
|
|
|
||
|
|
struct squashfs_xattr_id {
|
||
|
|
__le64 xattr;
|
||
|
|
__le32 count;
|
||
|
|
__le32 size;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct squashfs_xattr_id_table {
|
||
|
|
__le64 xattr_table_start;
|
||
|
|
__le32 xattr_ids;
|
||
|
|
__le32 unused;
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif
|