/* * squashfs_fs.h * * Copyright (c) 2012 Phillip Lougher * * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef SQUASHFS_FS #define SQUASHFS_FS #ifdef HAVE_LINUX_TYPES_LE16 #include #else #include typedef uint16_t __le16; typedef uint32_t __le32; typedef uint64_t __le64; #endif #define SQUASHFS_MAGIC 0x73717368 #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 ((int64_t)-1) /* 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 /* 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 #define SQUASHFS_COMPRESSED_BIT (1 << 15) #define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24) /* cached data constants for filesystem */ #ifdef SQFS_MULTITHREADED # define SQUASHFS_CACHED_BLKS 128 #else # define SQUASHFS_CACHED_BLKS 8 #endif #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 /* * 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 #define ZSTD_COMPRESSION 6 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; }; 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; }; 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; }; 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; }; 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_entry { __le16 offset; __le16 inode_number; __le16 type; __le16 size; }; 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; }; struct squashfs_xattr_val { __le32 vsize; }; 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