800 lines
23 KiB
C
800 lines
23 KiB
C
/*
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* This file is part of UBIFS.
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*
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* Copyright (C) 2006-2008 Nokia Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Authors: Artem Bityutskiy (Битюцкий Артём)
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* Adrian Hunter
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*/
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/*
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* This file describes UBIFS on-flash format and contains definitions of all the
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* relevant data structures and constants.
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*
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* All UBIFS on-flash objects are stored in the form of nodes. All nodes start
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* with the UBIFS node magic number and have the same common header. Nodes
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* always sit at 8-byte aligned positions on the media and node header sizes are
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* also 8-byte aligned (except for the indexing node and the padding node).
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*/
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#ifndef __UBIFS_MEDIA_H__
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#define __UBIFS_MEDIA_H__
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/* UBIFS node magic number (must not have the padding byte first or last) */
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#define UBIFS_NODE_MAGIC 0x06101831
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/*
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* UBIFS on-flash format version. This version is increased when the on-flash
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* format is changing. If this happens, UBIFS is will support older versions as
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* well. But older UBIFS code will not support newer formats. Format changes
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* will be rare and only when absolutely necessary, e.g. to fix a bug or to add
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* a new feature.
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*
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* UBIFS went into mainline kernel with format version 4. The older formats
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* were development formats.
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*/
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#define UBIFS_FORMAT_VERSION 5
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/*
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* Read-only compatibility version. If the UBIFS format is changed, older UBIFS
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* implementations will not be able to mount newer formats in read-write mode.
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* However, depending on the change, it may be possible to mount newer formats
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* in R/O mode. This is indicated by the R/O compatibility version which is
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* stored in the super-block.
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*
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* This is needed to support boot-loaders which only need R/O mounting. With
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* this flag it is possible to do UBIFS format changes without a need to update
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* boot-loaders.
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*/
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#define UBIFS_RO_COMPAT_VERSION 0
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/* Minimum logical eraseblock size in bytes */
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#define UBIFS_MIN_LEB_SZ (15*1024)
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/* Initial CRC32 value used when calculating CRC checksums */
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#define UBIFS_CRC32_INIT 0xFFFFFFFFU
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/*
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* UBIFS does not try to compress data if its length is less than the below
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* constant.
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*/
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#define UBIFS_MIN_COMPR_LEN 128
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/*
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* If compressed data length is less than %UBIFS_MIN_COMPRESS_DIFF bytes
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* shorter than uncompressed data length, UBIFS prefers to leave this data
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* node uncompress, because it'll be read faster.
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*/
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#define UBIFS_MIN_COMPRESS_DIFF 64
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/* Root inode number */
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#define UBIFS_ROOT_INO 1
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/* Lowest inode number used for regular inodes (not UBIFS-only internal ones) */
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#define UBIFS_FIRST_INO 64
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/*
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* Maximum file name and extended attribute length (must be a multiple of 8,
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* minus 1).
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*/
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#define UBIFS_MAX_NLEN 255
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/* Maximum number of data journal heads */
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#define UBIFS_MAX_JHEADS 1
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/*
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* Size of UBIFS data block. Note, UBIFS is not a block oriented file-system,
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* which means that it does not treat the underlying media as consisting of
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* blocks like in case of hard drives. Do not be confused. UBIFS block is just
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* the maximum amount of data which one data node can have or which can be
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* attached to an inode node.
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*/
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#define UBIFS_BLOCK_SIZE 4096
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#define UBIFS_BLOCK_SHIFT 12
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/* UBIFS padding byte pattern (must not be first or last byte of node magic) */
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#define UBIFS_PADDING_BYTE 0xCE
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/* Maximum possible key length */
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#define UBIFS_MAX_KEY_LEN 16
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/* Key length ("simple" format) */
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#define UBIFS_SK_LEN 8
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/* Minimum index tree fanout */
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#define UBIFS_MIN_FANOUT 3
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/* Maximum number of levels in UBIFS indexing B-tree */
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#define UBIFS_MAX_LEVELS 512
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/* Maximum amount of data attached to an inode in bytes */
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#define UBIFS_MAX_INO_DATA UBIFS_BLOCK_SIZE
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/* LEB Properties Tree fanout (must be power of 2) and fanout shift */
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#define UBIFS_LPT_FANOUT 4
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#define UBIFS_LPT_FANOUT_SHIFT 2
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/* LEB Properties Tree bit field sizes */
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#define UBIFS_LPT_CRC_BITS 16
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#define UBIFS_LPT_CRC_BYTES 2
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#define UBIFS_LPT_TYPE_BITS 4
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/* The key is always at the same position in all keyed nodes */
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#define UBIFS_KEY_OFFSET offsetof(struct ubifs_ino_node, key)
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/* Garbage collector journal head number */
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#define UBIFS_GC_HEAD 0
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/* Base journal head number */
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#define UBIFS_BASE_HEAD 1
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/* Data journal head number */
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#define UBIFS_DATA_HEAD 2
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/*
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* LEB Properties Tree node types.
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*
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* UBIFS_LPT_PNODE: LPT leaf node (contains LEB properties)
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* UBIFS_LPT_NNODE: LPT internal node
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* UBIFS_LPT_LTAB: LPT's own lprops table
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* UBIFS_LPT_LSAVE: LPT's save table (big model only)
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* UBIFS_LPT_NODE_CNT: count of LPT node types
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* UBIFS_LPT_NOT_A_NODE: all ones (15 for 4 bits) is never a valid node type
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*/
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enum {
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UBIFS_LPT_PNODE,
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UBIFS_LPT_NNODE,
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UBIFS_LPT_LTAB,
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UBIFS_LPT_LSAVE,
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UBIFS_LPT_NODE_CNT,
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UBIFS_LPT_NOT_A_NODE = (1 << UBIFS_LPT_TYPE_BITS) - 1,
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};
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/*
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* UBIFS inode types.
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*
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* UBIFS_ITYPE_REG: regular file
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* UBIFS_ITYPE_DIR: directory
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* UBIFS_ITYPE_LNK: soft link
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* UBIFS_ITYPE_BLK: block device node
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* UBIFS_ITYPE_CHR: character device node
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* UBIFS_ITYPE_FIFO: fifo
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* UBIFS_ITYPE_SOCK: socket
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* UBIFS_ITYPES_CNT: count of supported file types
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*/
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enum {
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UBIFS_ITYPE_REG,
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UBIFS_ITYPE_DIR,
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UBIFS_ITYPE_LNK,
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UBIFS_ITYPE_BLK,
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UBIFS_ITYPE_CHR,
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UBIFS_ITYPE_FIFO,
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UBIFS_ITYPE_SOCK,
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UBIFS_ITYPES_CNT,
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};
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/*
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* Supported key hash functions.
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*
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* UBIFS_KEY_HASH_R5: R5 hash
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* UBIFS_KEY_HASH_TEST: test hash which just returns first 4 bytes of the name
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*/
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enum {
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UBIFS_KEY_HASH_R5,
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UBIFS_KEY_HASH_TEST,
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};
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/*
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* Supported key formats.
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*
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* UBIFS_SIMPLE_KEY_FMT: simple key format
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*/
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enum {
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UBIFS_SIMPLE_KEY_FMT,
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};
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/*
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* The simple key format uses 29 bits for storing UBIFS block number and hash
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* value.
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*/
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#define UBIFS_S_KEY_BLOCK_BITS 29
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#define UBIFS_S_KEY_BLOCK_MASK 0x1FFFFFFF
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#define UBIFS_S_KEY_HASH_BITS UBIFS_S_KEY_BLOCK_BITS
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#define UBIFS_S_KEY_HASH_MASK UBIFS_S_KEY_BLOCK_MASK
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/*
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* Key types.
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*
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* UBIFS_INO_KEY: inode node key
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* UBIFS_DATA_KEY: data node key
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* UBIFS_DENT_KEY: directory entry node key
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* UBIFS_XENT_KEY: extended attribute entry key
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* UBIFS_KEY_TYPES_CNT: number of supported key types
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*/
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enum {
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UBIFS_INO_KEY,
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UBIFS_DATA_KEY,
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UBIFS_DENT_KEY,
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UBIFS_XENT_KEY,
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UBIFS_KEY_TYPES_CNT,
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};
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/* Count of LEBs reserved for the superblock area */
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#define UBIFS_SB_LEBS 1
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/* Count of LEBs reserved for the master area */
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#define UBIFS_MST_LEBS 2
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/* First LEB of the superblock area */
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#define UBIFS_SB_LNUM 0
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/* First LEB of the master area */
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#define UBIFS_MST_LNUM (UBIFS_SB_LNUM + UBIFS_SB_LEBS)
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/* First LEB of the log area */
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#define UBIFS_LOG_LNUM (UBIFS_MST_LNUM + UBIFS_MST_LEBS)
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/*
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* The below constants define the absolute minimum values for various UBIFS
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* media areas. Many of them actually depend of flash geometry and the FS
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* configuration (number of journal heads, orphan LEBs, etc). This means that
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* the smallest volume size which can be used for UBIFS cannot be pre-defined
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* by these constants. The file-system that meets the below limitation will not
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* necessarily mount. UBIFS does run-time calculations and validates the FS
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* size.
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*/
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/* Minimum number of logical eraseblocks in the log */
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#define UBIFS_MIN_LOG_LEBS 2
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/* Minimum number of bud logical eraseblocks (one for each head) */
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#define UBIFS_MIN_BUD_LEBS 3
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/* Minimum number of journal logical eraseblocks */
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#define UBIFS_MIN_JNL_LEBS (UBIFS_MIN_LOG_LEBS + UBIFS_MIN_BUD_LEBS)
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/* Minimum number of LPT area logical eraseblocks */
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#define UBIFS_MIN_LPT_LEBS 2
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/* Minimum number of orphan area logical eraseblocks */
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#define UBIFS_MIN_ORPH_LEBS 1
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/*
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* Minimum number of main area logical eraseblocks (buds, 3 for the index, 1
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* for GC, 1 for deletions, and at least 1 for committed data).
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*/
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#define UBIFS_MIN_MAIN_LEBS (UBIFS_MIN_BUD_LEBS + 6)
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/* Minimum number of logical eraseblocks */
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#define UBIFS_MIN_LEB_CNT (UBIFS_SB_LEBS + UBIFS_MST_LEBS + \
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UBIFS_MIN_LOG_LEBS + UBIFS_MIN_LPT_LEBS + \
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UBIFS_MIN_ORPH_LEBS + UBIFS_MIN_MAIN_LEBS)
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/* Node sizes (N.B. these are guaranteed to be multiples of 8) */
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#define UBIFS_CH_SZ sizeof(struct ubifs_ch)
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#define UBIFS_INO_NODE_SZ sizeof(struct ubifs_ino_node)
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#define UBIFS_DATA_NODE_SZ sizeof(struct ubifs_data_node)
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#define UBIFS_DENT_NODE_SZ sizeof(struct ubifs_dent_node)
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#define UBIFS_TRUN_NODE_SZ sizeof(struct ubifs_trun_node)
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#define UBIFS_PAD_NODE_SZ sizeof(struct ubifs_pad_node)
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#define UBIFS_SB_NODE_SZ sizeof(struct ubifs_sb_node)
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#define UBIFS_MST_NODE_SZ sizeof(struct ubifs_mst_node)
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#define UBIFS_REF_NODE_SZ sizeof(struct ubifs_ref_node)
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#define UBIFS_IDX_NODE_SZ sizeof(struct ubifs_idx_node)
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#define UBIFS_CS_NODE_SZ sizeof(struct ubifs_cs_node)
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#define UBIFS_ORPH_NODE_SZ sizeof(struct ubifs_orph_node)
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/* Extended attribute entry nodes are identical to directory entry nodes */
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#define UBIFS_XENT_NODE_SZ UBIFS_DENT_NODE_SZ
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/* Only this does not have to be multiple of 8 bytes */
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#define UBIFS_BRANCH_SZ sizeof(struct ubifs_branch)
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/* Maximum node sizes (N.B. these are guaranteed to be multiples of 8) */
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#define UBIFS_MAX_DATA_NODE_SZ (UBIFS_DATA_NODE_SZ + UBIFS_BLOCK_SIZE)
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#define UBIFS_MAX_INO_NODE_SZ (UBIFS_INO_NODE_SZ + UBIFS_MAX_INO_DATA)
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#define UBIFS_MAX_DENT_NODE_SZ (UBIFS_DENT_NODE_SZ + UBIFS_MAX_NLEN + 1)
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#define UBIFS_MAX_XENT_NODE_SZ UBIFS_MAX_DENT_NODE_SZ
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/* The largest UBIFS node */
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#define UBIFS_MAX_NODE_SZ UBIFS_MAX_INO_NODE_SZ
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/*
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* xattr name of UBIFS encryption context, we don't use a prefix
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* nor a long name to not waste space on the flash.
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*/
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#define UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT "c"
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/*
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* On-flash inode flags.
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*
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* UBIFS_COMPR_FL: use compression for this inode
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* UBIFS_SYNC_FL: I/O on this inode has to be synchronous
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* UBIFS_IMMUTABLE_FL: inode is immutable
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* UBIFS_APPEND_FL: writes to the inode may only append data
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* UBIFS_DIRSYNC_FL: I/O on this directory inode has to be synchronous
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* UBIFS_XATTR_FL: this inode is the inode for an extended attribute value
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* UBIFS_CRYPT_FL: use encryption for this inode
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*
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* Note, these are on-flash flags which correspond to ioctl flags
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* (@FS_COMPR_FL, etc). They have the same values now, but generally, do not
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* have to be the same.
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*/
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enum {
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UBIFS_COMPR_FL = 0x01,
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UBIFS_SYNC_FL = 0x02,
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UBIFS_IMMUTABLE_FL = 0x04,
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UBIFS_APPEND_FL = 0x08,
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UBIFS_DIRSYNC_FL = 0x10,
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UBIFS_XATTR_FL = 0x20,
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UBIFS_CRYPT_FL = 0x40,
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};
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/* Inode flag bits used by UBIFS */
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#define UBIFS_FL_MASK 0x0000001F
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/*
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* UBIFS compression algorithms.
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*
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* UBIFS_COMPR_NONE: no compression
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* UBIFS_COMPR_LZO: LZO compression
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* UBIFS_COMPR_ZLIB: ZLIB compression
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* UBIFS_COMPR_TYPES_CNT: count of supported compression types
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*/
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enum {
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UBIFS_COMPR_NONE,
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UBIFS_COMPR_LZO,
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UBIFS_COMPR_ZLIB,
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UBIFS_COMPR_TYPES_CNT,
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};
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/*
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* UBIFS node types.
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*
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* UBIFS_INO_NODE: inode node
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* UBIFS_DATA_NODE: data node
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* UBIFS_DENT_NODE: directory entry node
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* UBIFS_XENT_NODE: extended attribute node
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* UBIFS_TRUN_NODE: truncation node
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* UBIFS_PAD_NODE: padding node
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* UBIFS_SB_NODE: superblock node
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* UBIFS_MST_NODE: master node
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* UBIFS_REF_NODE: LEB reference node
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* UBIFS_IDX_NODE: index node
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* UBIFS_CS_NODE: commit start node
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* UBIFS_ORPH_NODE: orphan node
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* UBIFS_NODE_TYPES_CNT: count of supported node types
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*
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* Note, we index arrays by these numbers, so keep them low and contiguous.
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* Node type constants for inodes, direntries and so on have to be the same as
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* corresponding key type constants.
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*/
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enum {
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UBIFS_INO_NODE,
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UBIFS_DATA_NODE,
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UBIFS_DENT_NODE,
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UBIFS_XENT_NODE,
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UBIFS_TRUN_NODE,
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UBIFS_PAD_NODE,
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UBIFS_SB_NODE,
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UBIFS_MST_NODE,
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UBIFS_REF_NODE,
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UBIFS_IDX_NODE,
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UBIFS_CS_NODE,
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UBIFS_ORPH_NODE,
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UBIFS_NODE_TYPES_CNT,
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};
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/*
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* Master node flags.
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*
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* UBIFS_MST_DIRTY: rebooted uncleanly - master node is dirty
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* UBIFS_MST_NO_ORPHS: no orphan inodes present
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* UBIFS_MST_RCVRY: written by recovery
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*/
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enum {
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UBIFS_MST_DIRTY = 1,
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UBIFS_MST_NO_ORPHS = 2,
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UBIFS_MST_RCVRY = 4,
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};
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/*
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* Node group type (used by recovery to recover whole group or none).
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*
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* UBIFS_NO_NODE_GROUP: this node is not part of a group
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* UBIFS_IN_NODE_GROUP: this node is a part of a group
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* UBIFS_LAST_OF_NODE_GROUP: this node is the last in a group
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*/
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enum {
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UBIFS_NO_NODE_GROUP = 0,
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UBIFS_IN_NODE_GROUP,
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UBIFS_LAST_OF_NODE_GROUP,
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};
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/*
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* Superblock flags.
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*
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* UBIFS_FLG_BIGLPT: if "big" LPT model is used if set
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* UBIFS_FLG_SPACE_FIXUP: first-mount "fixup" of free space within LEBs needed
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* UBIFS_FLG_DOUBLE_HASH: store a 32bit cookie in directory entry nodes to
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* support 64bit cookies for lookups by hash
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* UBIFS_FLG_ENCRYPTION: this filesystem contains encrypted files
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*/
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enum {
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UBIFS_FLG_BIGLPT = 0x02,
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UBIFS_FLG_SPACE_FIXUP = 0x04,
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UBIFS_FLG_DOUBLE_HASH = 0x08,
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UBIFS_FLG_ENCRYPTION = 0x10,
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};
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#define UBIFS_FLG_MASK (UBIFS_FLG_BIGLPT|UBIFS_FLG_SPACE_FIXUP|UBIFS_FLG_DOUBLE_HASH|UBIFS_FLG_ENCRYPTION)
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/**
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* struct ubifs_ch - common header node.
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* @magic: UBIFS node magic number (%UBIFS_NODE_MAGIC)
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* @crc: CRC-32 checksum of the node header
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* @sqnum: sequence number
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* @len: full node length
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* @node_type: node type
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* @group_type: node group type
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* @padding: reserved for future, zeroes
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*
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* Every UBIFS node starts with this common part. If the node has a key, the
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* key always goes next.
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*/
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struct ubifs_ch {
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__le32 magic;
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__le32 crc;
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|
__le64 sqnum;
|
|
__le32 len;
|
|
__u8 node_type;
|
|
__u8 group_type;
|
|
__u8 padding[2];
|
|
} __packed;
|
|
|
|
/**
|
|
* union ubifs_dev_desc - device node descriptor.
|
|
* @new: new type device descriptor
|
|
* @huge: huge type device descriptor
|
|
*
|
|
* This data structure describes major/minor numbers of a device node. In an
|
|
* inode is a device node then its data contains an object of this type. UBIFS
|
|
* uses standard Linux "new" and "huge" device node encodings.
|
|
*/
|
|
union ubifs_dev_desc {
|
|
__le32 new;
|
|
__le64 huge;
|
|
} __packed;
|
|
|
|
/**
|
|
* struct ubifs_ino_node - inode node.
|
|
* @ch: common header
|
|
* @key: node key
|
|
* @creat_sqnum: sequence number at time of creation
|
|
* @size: inode size in bytes (amount of uncompressed data)
|
|
* @atime_sec: access time seconds
|
|
* @ctime_sec: creation time seconds
|
|
* @mtime_sec: modification time seconds
|
|
* @atime_nsec: access time nanoseconds
|
|
* @ctime_nsec: creation time nanoseconds
|
|
* @mtime_nsec: modification time nanoseconds
|
|
* @nlink: number of hard links
|
|
* @uid: owner ID
|
|
* @gid: group ID
|
|
* @mode: access flags
|
|
* @flags: per-inode flags (%UBIFS_COMPR_FL, %UBIFS_SYNC_FL, etc)
|
|
* @data_len: inode data length
|
|
* @xattr_cnt: count of extended attributes this inode has
|
|
* @xattr_size: summarized size of all extended attributes in bytes
|
|
* @padding1: reserved for future, zeroes
|
|
* @xattr_names: sum of lengths of all extended attribute names belonging to
|
|
* this inode
|
|
* @compr_type: compression type used for this inode
|
|
* @padding2: reserved for future, zeroes
|
|
* @data: data attached to the inode
|
|
*
|
|
* Note, even though inode compression type is defined by @compr_type, some
|
|
* nodes of this inode may be compressed with different compressor - this
|
|
* happens if compression type is changed while the inode already has data
|
|
* nodes. But @compr_type will be use for further writes to the inode.
|
|
*
|
|
* Note, do not forget to amend 'zero_ino_node_unused()' function when changing
|
|
* the padding fields.
|
|
*/
|
|
struct ubifs_ino_node {
|
|
struct ubifs_ch ch;
|
|
__u8 key[UBIFS_MAX_KEY_LEN];
|
|
__le64 creat_sqnum;
|
|
__le64 size;
|
|
__le64 atime_sec;
|
|
__le64 ctime_sec;
|
|
__le64 mtime_sec;
|
|
__le32 atime_nsec;
|
|
__le32 ctime_nsec;
|
|
__le32 mtime_nsec;
|
|
__le32 nlink;
|
|
__le32 uid;
|
|
__le32 gid;
|
|
__le32 mode;
|
|
__le32 flags;
|
|
__le32 data_len;
|
|
__le32 xattr_cnt;
|
|
__le32 xattr_size;
|
|
__u8 padding1[4]; /* Watch 'zero_ino_node_unused()' if changing! */
|
|
__le32 xattr_names;
|
|
__le16 compr_type;
|
|
__u8 padding2[26]; /* Watch 'zero_ino_node_unused()' if changing! */
|
|
__u8 data[];
|
|
} __packed;
|
|
|
|
/**
|
|
* struct ubifs_dent_node - directory entry node.
|
|
* @ch: common header
|
|
* @key: node key
|
|
* @inum: target inode number
|
|
* @padding1: reserved for future, zeroes
|
|
* @type: type of the target inode (%UBIFS_ITYPE_REG, %UBIFS_ITYPE_DIR, etc)
|
|
* @nlen: name length
|
|
* @cookie: A 32bits random number, used to construct a 64bits
|
|
* identifier.
|
|
* @name: zero-terminated name
|
|
*
|
|
* Note, do not forget to amend 'zero_dent_node_unused()' function when
|
|
* changing the padding fields.
|
|
*/
|
|
struct ubifs_dent_node {
|
|
struct ubifs_ch ch;
|
|
__u8 key[UBIFS_MAX_KEY_LEN];
|
|
__le64 inum;
|
|
__u8 padding1;
|
|
__u8 type;
|
|
__le16 nlen;
|
|
__le32 cookie;
|
|
__u8 name[];
|
|
} __packed;
|
|
|
|
/**
|
|
* struct ubifs_data_node - data node.
|
|
* @ch: common header
|
|
* @key: node key
|
|
* @size: uncompressed data size in bytes
|
|
* @compr_type: compression type (%UBIFS_COMPR_NONE, %UBIFS_COMPR_LZO, etc)
|
|
* @compr_size: compressed data size in bytes, only valid when data is encrypted
|
|
* @data: data
|
|
*
|
|
*/
|
|
struct ubifs_data_node {
|
|
struct ubifs_ch ch;
|
|
__u8 key[UBIFS_MAX_KEY_LEN];
|
|
__le32 size;
|
|
__le16 compr_type;
|
|
__le16 compr_size;
|
|
__u8 data[];
|
|
} __packed;
|
|
|
|
/**
|
|
* struct ubifs_trun_node - truncation node.
|
|
* @ch: common header
|
|
* @inum: truncated inode number
|
|
* @padding: reserved for future, zeroes
|
|
* @old_size: size before truncation
|
|
* @new_size: size after truncation
|
|
*
|
|
* This node exists only in the journal and never goes to the main area. Note,
|
|
* do not forget to amend 'zero_trun_node_unused()' function when changing the
|
|
* padding fields.
|
|
*/
|
|
struct ubifs_trun_node {
|
|
struct ubifs_ch ch;
|
|
__le32 inum;
|
|
__u8 padding[12]; /* Watch 'zero_trun_node_unused()' if changing! */
|
|
__le64 old_size;
|
|
__le64 new_size;
|
|
} __packed;
|
|
|
|
/**
|
|
* struct ubifs_pad_node - padding node.
|
|
* @ch: common header
|
|
* @pad_len: how many bytes after this node are unused (because padded)
|
|
* @padding: reserved for future, zeroes
|
|
*/
|
|
struct ubifs_pad_node {
|
|
struct ubifs_ch ch;
|
|
__le32 pad_len;
|
|
} __packed;
|
|
|
|
/**
|
|
* struct ubifs_sb_node - superblock node.
|
|
* @ch: common header
|
|
* @padding: reserved for future, zeroes
|
|
* @key_hash: type of hash function used in keys
|
|
* @key_fmt: format of the key
|
|
* @flags: file-system flags (%UBIFS_FLG_BIGLPT, etc)
|
|
* @min_io_size: minimal input/output unit size
|
|
* @leb_size: logical eraseblock size in bytes
|
|
* @leb_cnt: count of LEBs used by file-system
|
|
* @max_leb_cnt: maximum count of LEBs used by file-system
|
|
* @max_bud_bytes: maximum amount of data stored in buds
|
|
* @log_lebs: log size in logical eraseblocks
|
|
* @lpt_lebs: number of LEBs used for lprops table
|
|
* @orph_lebs: number of LEBs used for recording orphans
|
|
* @jhead_cnt: count of journal heads
|
|
* @fanout: tree fanout (max. number of links per indexing node)
|
|
* @lsave_cnt: number of LEB numbers in LPT's save table
|
|
* @fmt_version: UBIFS on-flash format version
|
|
* @default_compr: default compression algorithm (%UBIFS_COMPR_LZO, etc)
|
|
* @padding1: reserved for future, zeroes
|
|
* @rp_uid: reserve pool UID
|
|
* @rp_gid: reserve pool GID
|
|
* @rp_size: size of the reserved pool in bytes
|
|
* @padding2: reserved for future, zeroes
|
|
* @time_gran: time granularity in nanoseconds
|
|
* @uuid: UUID generated when the file system image was created
|
|
* @ro_compat_version: UBIFS R/O compatibility version
|
|
*/
|
|
struct ubifs_sb_node {
|
|
struct ubifs_ch ch;
|
|
__u8 padding[2];
|
|
__u8 key_hash;
|
|
__u8 key_fmt;
|
|
__le32 flags;
|
|
__le32 min_io_size;
|
|
__le32 leb_size;
|
|
__le32 leb_cnt;
|
|
__le32 max_leb_cnt;
|
|
__le64 max_bud_bytes;
|
|
__le32 log_lebs;
|
|
__le32 lpt_lebs;
|
|
__le32 orph_lebs;
|
|
__le32 jhead_cnt;
|
|
__le32 fanout;
|
|
__le32 lsave_cnt;
|
|
__le32 fmt_version;
|
|
__le16 default_compr;
|
|
__u8 padding1[2];
|
|
__le32 rp_uid;
|
|
__le32 rp_gid;
|
|
__le64 rp_size;
|
|
__le32 time_gran;
|
|
__u8 uuid[16];
|
|
__le32 ro_compat_version;
|
|
__u8 padding2[3968];
|
|
} __packed;
|
|
|
|
/**
|
|
* struct ubifs_mst_node - master node.
|
|
* @ch: common header
|
|
* @highest_inum: highest inode number in the committed index
|
|
* @cmt_no: commit number
|
|
* @flags: various flags (%UBIFS_MST_DIRTY, etc)
|
|
* @log_lnum: start of the log
|
|
* @root_lnum: LEB number of the root indexing node
|
|
* @root_offs: offset within @root_lnum
|
|
* @root_len: root indexing node length
|
|
* @gc_lnum: LEB reserved for garbage collection (%-1 value means the LEB was
|
|
* not reserved and should be reserved on mount)
|
|
* @ihead_lnum: LEB number of index head
|
|
* @ihead_offs: offset of index head
|
|
* @index_size: size of index on flash
|
|
* @total_free: total free space in bytes
|
|
* @total_dirty: total dirty space in bytes
|
|
* @total_used: total used space in bytes (includes only data LEBs)
|
|
* @total_dead: total dead space in bytes (includes only data LEBs)
|
|
* @total_dark: total dark space in bytes (includes only data LEBs)
|
|
* @lpt_lnum: LEB number of LPT root nnode
|
|
* @lpt_offs: offset of LPT root nnode
|
|
* @nhead_lnum: LEB number of LPT head
|
|
* @nhead_offs: offset of LPT head
|
|
* @ltab_lnum: LEB number of LPT's own lprops table
|
|
* @ltab_offs: offset of LPT's own lprops table
|
|
* @lsave_lnum: LEB number of LPT's save table (big model only)
|
|
* @lsave_offs: offset of LPT's save table (big model only)
|
|
* @lscan_lnum: LEB number of last LPT scan
|
|
* @empty_lebs: number of empty logical eraseblocks
|
|
* @idx_lebs: number of indexing logical eraseblocks
|
|
* @leb_cnt: count of LEBs used by file-system
|
|
* @padding: reserved for future, zeroes
|
|
*/
|
|
struct ubifs_mst_node {
|
|
struct ubifs_ch ch;
|
|
__le64 highest_inum;
|
|
__le64 cmt_no;
|
|
__le32 flags;
|
|
__le32 log_lnum;
|
|
__le32 root_lnum;
|
|
__le32 root_offs;
|
|
__le32 root_len;
|
|
__le32 gc_lnum;
|
|
__le32 ihead_lnum;
|
|
__le32 ihead_offs;
|
|
__le64 index_size;
|
|
__le64 total_free;
|
|
__le64 total_dirty;
|
|
__le64 total_used;
|
|
__le64 total_dead;
|
|
__le64 total_dark;
|
|
__le32 lpt_lnum;
|
|
__le32 lpt_offs;
|
|
__le32 nhead_lnum;
|
|
__le32 nhead_offs;
|
|
__le32 ltab_lnum;
|
|
__le32 ltab_offs;
|
|
__le32 lsave_lnum;
|
|
__le32 lsave_offs;
|
|
__le32 lscan_lnum;
|
|
__le32 empty_lebs;
|
|
__le32 idx_lebs;
|
|
__le32 leb_cnt;
|
|
__u8 padding[344];
|
|
} __packed;
|
|
|
|
/**
|
|
* struct ubifs_ref_node - logical eraseblock reference node.
|
|
* @ch: common header
|
|
* @lnum: the referred logical eraseblock number
|
|
* @offs: start offset in the referred LEB
|
|
* @jhead: journal head number
|
|
* @padding: reserved for future, zeroes
|
|
*/
|
|
struct ubifs_ref_node {
|
|
struct ubifs_ch ch;
|
|
__le32 lnum;
|
|
__le32 offs;
|
|
__le32 jhead;
|
|
__u8 padding[28];
|
|
} __packed;
|
|
|
|
/**
|
|
* struct ubifs_branch - key/reference/length branch
|
|
* @lnum: LEB number of the target node
|
|
* @offs: offset within @lnum
|
|
* @len: target node length
|
|
* @key: key
|
|
*/
|
|
struct ubifs_branch {
|
|
__le32 lnum;
|
|
__le32 offs;
|
|
__le32 len;
|
|
__u8 key[];
|
|
} __packed;
|
|
|
|
/**
|
|
* struct ubifs_idx_node - indexing node.
|
|
* @ch: common header
|
|
* @child_cnt: number of child index nodes
|
|
* @level: tree level
|
|
* @branches: LEB number / offset / length / key branches
|
|
*/
|
|
struct ubifs_idx_node {
|
|
struct ubifs_ch ch;
|
|
__le16 child_cnt;
|
|
__le16 level;
|
|
__u8 branches[];
|
|
} __packed;
|
|
|
|
/**
|
|
* struct ubifs_cs_node - commit start node.
|
|
* @ch: common header
|
|
* @cmt_no: commit number
|
|
*/
|
|
struct ubifs_cs_node {
|
|
struct ubifs_ch ch;
|
|
__le64 cmt_no;
|
|
} __packed;
|
|
|
|
/**
|
|
* struct ubifs_orph_node - orphan node.
|
|
* @ch: common header
|
|
* @cmt_no: commit number (also top bit is set on the last node of the commit)
|
|
* @inos: inode numbers of orphans
|
|
*/
|
|
struct ubifs_orph_node {
|
|
struct ubifs_ch ch;
|
|
__le64 cmt_no;
|
|
__le64 inos[];
|
|
} __packed;
|
|
|
|
#endif /* __UBIFS_MEDIA_H__ */
|