#ifndef SQUASHFS_FS
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#define SQUASHFS_FS
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/*
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* Squashfs
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*
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* Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012,
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* 2013, 2014
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* Phillip Lougher <phillip@squashfs.org.uk>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2,
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* or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* squashfs_fs.h
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*/
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#define SQUASHFS_CACHED_FRAGMENTS CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
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#define SQUASHFS_MAJOR 4
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#define SQUASHFS_MINOR 0
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#define SQUASHFS_MAGIC 0x73717368
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#define SQUASHFS_MAGIC_SWAP 0x68737173
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#define SQUASHFS_START 0
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/* size of metadata (inode and directory) blocks */
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#define SQUASHFS_METADATA_SIZE 8192
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#define SQUASHFS_METADATA_LOG 13
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/* default size of data blocks */
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#define SQUASHFS_FILE_SIZE 131072
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#define SQUASHFS_FILE_MAX_SIZE 1048576
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#define SQUASHFS_FILE_MAX_LOG 20
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/* Max number of uids and gids */
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#define SQUASHFS_IDS 65536
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/* Max length of filename (not 255) */
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#define SQUASHFS_NAME_LEN 256
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#define SQUASHFS_INVALID ((long long) 0xffffffffffff)
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#define SQUASHFS_INVALID_FRAG ((unsigned int) 0xffffffff)
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#define SQUASHFS_INVALID_XATTR ((unsigned int) 0xffffffff)
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#define SQUASHFS_INVALID_BLK ((long long) -1)
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#define SQUASHFS_USED_BLK ((long long) -2)
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/* Filesystem flags */
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#define SQUASHFS_NOI 0
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#define SQUASHFS_NOD 1
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#define SQUASHFS_CHECK 2
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#define SQUASHFS_NOF 3
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#define SQUASHFS_NO_FRAG 4
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#define SQUASHFS_ALWAYS_FRAG 5
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#define SQUASHFS_DUPLICATE 6
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#define SQUASHFS_EXPORT 7
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#define SQUASHFS_NOX 8
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#define SQUASHFS_NO_XATTR 9
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#define SQUASHFS_COMP_OPT 10
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#define SQUASHFS_BIT(flag, bit) ((flag >> bit) & 1)
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#define SQUASHFS_UNCOMPRESSED_INODES(flags) SQUASHFS_BIT(flags, \
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SQUASHFS_NOI)
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#define SQUASHFS_UNCOMPRESSED_DATA(flags) SQUASHFS_BIT(flags, \
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SQUASHFS_NOD)
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#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
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SQUASHFS_NOF)
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#define SQUASHFS_NO_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
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SQUASHFS_NO_FRAG)
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#define SQUASHFS_ALWAYS_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
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SQUASHFS_ALWAYS_FRAG)
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#define SQUASHFS_DUPLICATES(flags) SQUASHFS_BIT(flags, \
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SQUASHFS_DUPLICATE)
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#define SQUASHFS_EXPORTABLE(flags) SQUASHFS_BIT(flags, \
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SQUASHFS_EXPORT)
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#define SQUASHFS_UNCOMPRESSED_XATTRS(flags) SQUASHFS_BIT(flags, \
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SQUASHFS_NOX)
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#define SQUASHFS_NO_XATTRS(flags) SQUASHFS_BIT(flags, \
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SQUASHFS_NO_XATTR)
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#define SQUASHFS_COMP_OPTS(flags) SQUASHFS_BIT(flags, \
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SQUASHFS_COMP_OPT)
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#define SQUASHFS_MKFLAGS(noi, nod, nof, nox, no_frag, always_frag, \
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duplicate_checking, exportable, no_xattr, comp_opt) (noi | \
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(nod << 1) | (nof << 3) | (no_frag << 4) | \
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(always_frag << 5) | (duplicate_checking << 6) | \
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(exportable << 7) | (nox << 8) | (no_xattr << 9) | \
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(comp_opt << 10))
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/* Max number of types and file types */
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#define SQUASHFS_DIR_TYPE 1
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#define SQUASHFS_FILE_TYPE 2
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#define SQUASHFS_SYMLINK_TYPE 3
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#define SQUASHFS_BLKDEV_TYPE 4
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#define SQUASHFS_CHRDEV_TYPE 5
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#define SQUASHFS_FIFO_TYPE 6
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#define SQUASHFS_SOCKET_TYPE 7
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#define SQUASHFS_LDIR_TYPE 8
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#define SQUASHFS_LREG_TYPE 9
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#define SQUASHFS_LSYMLINK_TYPE 10
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#define SQUASHFS_LBLKDEV_TYPE 11
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#define SQUASHFS_LCHRDEV_TYPE 12
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#define SQUASHFS_LFIFO_TYPE 13
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#define SQUASHFS_LSOCKET_TYPE 14
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/* Xattr types */
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#define SQUASHFS_XATTR_USER 0
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#define SQUASHFS_XATTR_TRUSTED 1
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#define SQUASHFS_XATTR_SECURITY 2
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#define SQUASHFS_XATTR_VALUE_OOL 256
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#define SQUASHFS_XATTR_PREFIX_MASK 0xff
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/* Flag whether block is compressed or uncompressed, bit is set if block is
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* uncompressed */
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#define SQUASHFS_COMPRESSED_BIT (1 << 15)
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#define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
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(B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT)
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#define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT))
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#define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24)
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#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) ((B) & \
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~SQUASHFS_COMPRESSED_BIT_BLOCK)
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#define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
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/*
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* Inode number ops. Inodes consist of a compressed block number, and an
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* uncompressed offset within that block
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*/
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#define SQUASHFS_INODE_BLK(a) ((unsigned int) ((a) >> 16))
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#define SQUASHFS_INODE_OFFSET(a) ((unsigned int) ((a) & 0xffff))
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#define SQUASHFS_MKINODE(A, B) ((squashfs_inode)(((squashfs_inode) (A)\
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<< 16) + (B)))
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/* Compute 32 bit VFS inode number from squashfs inode number */
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#define SQUASHFS_MK_VFS_INODE(a, b) ((unsigned int) (((a) << 8) + \
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((b) >> 2) + 1))
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/* Translate between VFS mode and squashfs mode */
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#define SQUASHFS_MODE(a) ((a) & 0xfff)
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/* fragment and fragment table defines */
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#define SQUASHFS_FRAGMENT_BYTES(A) ((A) * \
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sizeof(struct squashfs_fragment_entry))
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#define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \
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SQUASHFS_METADATA_SIZE - 1) / \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\
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sizeof(long long))
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/* inode lookup table defines */
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#define SQUASHFS_LOOKUP_BYTES(A) ((A) * sizeof(squashfs_inode))
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#define SQUASHFS_LOOKUP_BLOCK(A) (SQUASHFS_LOOKUP_BYTES(A) / \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_LOOKUP_BLOCKS(A) ((SQUASHFS_LOOKUP_BYTES(A) + \
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SQUASHFS_METADATA_SIZE - 1) / \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_LOOKUP_BLOCK_BYTES(A) (SQUASHFS_LOOKUP_BLOCKS(A) *\
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sizeof(long long))
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/* uid lookup table defines */
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#define SQUASHFS_ID_BYTES(A) ((A) * sizeof(unsigned int))
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#define SQUASHFS_ID_BLOCK(A) (SQUASHFS_ID_BYTES(A) / \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_ID_BLOCK_OFFSET(A) (SQUASHFS_ID_BYTES(A) % \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_ID_BLOCKS(A) ((SQUASHFS_ID_BYTES(A) + \
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SQUASHFS_METADATA_SIZE - 1) / \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_ID_BLOCK_BYTES(A) (SQUASHFS_ID_BLOCKS(A) *\
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sizeof(long long))
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/* xattr id lookup table defines */
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#define SQUASHFS_XATTR_BYTES(A) ((A) * sizeof(struct squashfs_xattr_id))
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#define SQUASHFS_XATTR_BLOCK(A) (SQUASHFS_XATTR_BYTES(A) / \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_XATTR_BLOCK_OFFSET(A) (SQUASHFS_XATTR_BYTES(A) % \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_XATTR_BLOCKS(A) ((SQUASHFS_XATTR_BYTES(A) + \
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SQUASHFS_METADATA_SIZE - 1) / \
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SQUASHFS_METADATA_SIZE)
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#define SQUASHFS_XATTR_BLOCK_BYTES(A) (SQUASHFS_XATTR_BLOCKS(A) *\
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sizeof(long long))
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#define SQUASHFS_XATTR_BLK(A) ((unsigned int) ((A) >> 16))
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#define SQUASHFS_XATTR_OFFSET(A) ((unsigned int) ((A) & 0xffff))
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/* cached data constants for filesystem */
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#define SQUASHFS_CACHED_BLKS 8
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#define SQUASHFS_MAX_FILE_SIZE_LOG 64
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#define SQUASHFS_MAX_FILE_SIZE ((long long) 1 << \
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(SQUASHFS_MAX_FILE_SIZE_LOG - 2))
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#define SQUASHFS_MARKER_BYTE 0xff
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/* meta index cache */
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#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
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#define SQUASHFS_META_ENTRIES 31
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#define SQUASHFS_META_NUMBER 8
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#define SQUASHFS_SLOTS 4
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struct meta_entry {
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long long data_block;
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unsigned int index_block;
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unsigned short offset;
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unsigned short pad;
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};
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struct meta_index {
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unsigned int inode_number;
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unsigned int offset;
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unsigned short entries;
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unsigned short skip;
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unsigned short locked;
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unsigned short pad;
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struct meta_entry meta_entry[SQUASHFS_META_ENTRIES];
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};
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/*
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* definitions for structures on disk
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*/
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typedef long long squashfs_block;
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typedef long long squashfs_inode;
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#define ZLIB_COMPRESSION 1
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#define LZMA_COMPRESSION 2
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#define LZO_COMPRESSION 3
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#define XZ_COMPRESSION 4
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#define LZ4_COMPRESSION 5
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struct squashfs_super_block {
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unsigned int s_magic;
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unsigned int inodes;
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int mkfs_time /* time of filesystem creation */;
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unsigned int block_size;
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unsigned int fragments;
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unsigned short compression;
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unsigned short block_log;
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unsigned short flags;
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unsigned short no_ids;
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unsigned short s_major;
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unsigned short s_minor;
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squashfs_inode root_inode;
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long long bytes_used;
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long long id_table_start;
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long long xattr_id_table_start;
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long long inode_table_start;
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long long directory_table_start;
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long long fragment_table_start;
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long long lookup_table_start;
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};
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struct squashfs_dir_index {
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unsigned int index;
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unsigned int start_block;
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unsigned int size;
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unsigned char name[0];
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};
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struct squashfs_base_inode_header {
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unsigned short inode_type;
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unsigned short mode;
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unsigned short uid;
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unsigned short guid;
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int mtime;
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unsigned int inode_number;
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};
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struct squashfs_ipc_inode_header {
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unsigned short inode_type;
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unsigned short mode;
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unsigned short uid;
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unsigned short guid;
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int mtime;
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unsigned int inode_number;
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unsigned int nlink;
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};
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struct squashfs_lipc_inode_header {
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unsigned short inode_type;
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unsigned short mode;
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unsigned short uid;
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unsigned short guid;
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int mtime;
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unsigned int inode_number;
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unsigned int nlink;
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unsigned int xattr;
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};
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struct squashfs_dev_inode_header {
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unsigned short inode_type;
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unsigned short mode;
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unsigned short uid;
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unsigned short guid;
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int mtime;
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unsigned int inode_number;
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unsigned int nlink;
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unsigned int rdev;
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};
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struct squashfs_ldev_inode_header {
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unsigned short inode_type;
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unsigned short mode;
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unsigned short uid;
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unsigned short guid;
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int mtime;
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unsigned int inode_number;
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unsigned int nlink;
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unsigned int rdev;
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unsigned int xattr;
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};
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struct squashfs_symlink_inode_header {
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unsigned short inode_type;
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unsigned short mode;
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unsigned short uid;
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unsigned short guid;
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int mtime;
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unsigned int inode_number;
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unsigned int nlink;
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unsigned int symlink_size;
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char symlink[0];
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};
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struct squashfs_reg_inode_header {
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unsigned short inode_type;
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unsigned short mode;
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unsigned short uid;
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unsigned short guid;
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int mtime;
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unsigned int inode_number;
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unsigned int start_block;
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unsigned int fragment;
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unsigned int offset;
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unsigned int file_size;
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unsigned int block_list[0];
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};
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struct squashfs_lreg_inode_header {
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unsigned short inode_type;
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unsigned short mode;
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unsigned short uid;
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unsigned short guid;
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int mtime;
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unsigned int inode_number;
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squashfs_block start_block;
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long long file_size;
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long long sparse;
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unsigned int nlink;
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unsigned int fragment;
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unsigned int offset;
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unsigned int xattr;
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unsigned int block_list[0];
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};
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struct squashfs_dir_inode_header {
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unsigned short inode_type;
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unsigned short mode;
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unsigned short uid;
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unsigned short guid;
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int mtime;
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unsigned int inode_number;
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unsigned int start_block;
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unsigned int nlink;
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unsigned short file_size;
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unsigned short offset;
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unsigned int parent_inode;
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};
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struct squashfs_ldir_inode_header {
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unsigned short inode_type;
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unsigned short mode;
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unsigned short uid;
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unsigned short guid;
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int mtime;
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unsigned int inode_number;
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unsigned int nlink;
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unsigned int file_size;
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unsigned int start_block;
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unsigned int parent_inode;
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unsigned short i_count;
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unsigned short offset;
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unsigned int xattr;
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struct squashfs_dir_index index[0];
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};
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union squashfs_inode_header {
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struct squashfs_base_inode_header base;
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struct squashfs_dev_inode_header dev;
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struct squashfs_ldev_inode_header ldev;
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struct squashfs_symlink_inode_header symlink;
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struct squashfs_reg_inode_header reg;
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struct squashfs_lreg_inode_header lreg;
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struct squashfs_dir_inode_header dir;
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struct squashfs_ldir_inode_header ldir;
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struct squashfs_ipc_inode_header ipc;
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struct squashfs_lipc_inode_header lipc;
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};
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struct squashfs_dir_entry {
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unsigned short offset;
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short inode_number;
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unsigned short type;
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unsigned short size;
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char name[0];
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};
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struct squashfs_dir_header {
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unsigned int count;
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unsigned int start_block;
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unsigned int inode_number;
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};
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struct squashfs_fragment_entry {
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long long start_block;
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unsigned int size;
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unsigned int unused;
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};
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struct squashfs_xattr_entry {
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unsigned short type;
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unsigned short size;
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};
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struct squashfs_xattr_val {
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unsigned int vsize;
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};
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struct squashfs_xattr_id {
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long long xattr;
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unsigned int count;
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unsigned int size;
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};
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struct squashfs_xattr_table {
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long long xattr_table_start;
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unsigned int xattr_ids;
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unsigned int unused;
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};
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#endif
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