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855 lines
25 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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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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* Authors: Artem Bityutskiy (Битюцкий Артём) |
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* Adrian Hunter |
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*/ |
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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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|
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#ifndef __UBIFS_MEDIA_H__ |
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#define __UBIFS_MEDIA_H__ |
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|
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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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/* |
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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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|
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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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|
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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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|
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/* Root inode number */ |
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#define UBIFS_ROOT_INO 1 |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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#define UBIFS_AUTH_NODE_SZ sizeof(struct ubifs_auth_node) |
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#define UBIFS_SIG_NODE_SZ sizeof(struct ubifs_sig_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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/* The maxmimum size of a hash, enough for sha512 */ |
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#define UBIFS_MAX_HASH_LEN 64 |
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/* The maxmimum size of a hmac, enough for hmac(sha512) */ |
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#define UBIFS_MAX_HMAC_LEN 64 |
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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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/* Type field in ubifs_sig_node */ |
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#define UBIFS_SIGNATURE_TYPE_PKCS7 1 |
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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_ZSTD: ZSTD 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_ZSTD, |
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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_AUTH_NODE: authentication node |
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* UBIFS_SIG_NODE: signature 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_AUTH_NODE, |
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UBIFS_SIG_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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/* |
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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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/* |
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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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* UBIFS_FLG_AUTHENTICATION: this filesystem contains hashes for authentication |
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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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UBIFS_FLG_AUTHENTICATION = 0x20, |
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}; |
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#define UBIFS_FLG_MASK (UBIFS_FLG_BIGLPT | UBIFS_FLG_SPACE_FIXUP | \ |
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UBIFS_FLG_DOUBLE_HASH | UBIFS_FLG_ENCRYPTION | \ |
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UBIFS_FLG_AUTHENTICATION) |
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|
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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; |
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__le32 len; |
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__u8 node_type; |
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__u8 group_type; |
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__u8 padding[2]; |
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} __packed; |
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|
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/** |
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* union ubifs_dev_desc - device node descriptor. |
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* @new: new type device descriptor |
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* @huge: huge type device descriptor |
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* |
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* This data structure describes major/minor numbers of a device node. In an |
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* inode is a device node then its data contains an object of this type. UBIFS |
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* uses standard Linux "new" and "huge" device node encodings. |
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*/ |
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union ubifs_dev_desc { |
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__le32 new; |
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__le64 huge; |
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} __packed; |
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|
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/** |
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* struct ubifs_ino_node - inode node. |
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* @ch: common header |
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* @key: node key |
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* @creat_sqnum: sequence number at time of creation |
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* @size: inode size in bytes (amount of uncompressed data) |
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* @atime_sec: access time seconds |
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* @ctime_sec: creation time seconds |
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* @mtime_sec: modification time seconds |
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* @atime_nsec: access time nanoseconds |
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* @ctime_nsec: creation time nanoseconds |
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* @mtime_nsec: modification time nanoseconds |
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* @nlink: number of hard links |
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* @uid: owner ID |
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* @gid: group ID |
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* @mode: access flags |
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* @flags: per-inode flags (%UBIFS_COMPR_FL, %UBIFS_SYNC_FL, etc) |
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* @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 |
|
* @hmac: HMAC to authenticate the superblock node |
|
* @hmac_wkm: HMAC of a well known message (the string "UBIFS") as a convenience |
|
* to the user to check if the correct key is passed. |
|
* @hash_algo: The hash algo used for this filesystem (one of enum hash_algo) |
|
* @hash_mst: hash of the master node, only valid for signed images in which the |
|
* master node does not contain a hmac |
|
*/ |
|
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 hmac[UBIFS_MAX_HMAC_LEN]; |
|
__u8 hmac_wkm[UBIFS_MAX_HMAC_LEN]; |
|
__le16 hash_algo; |
|
__u8 hash_mst[UBIFS_MAX_HASH_LEN]; |
|
__u8 padding2[3774]; |
|
} __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 |
|
* @hash_root_idx: the hash of the root index node |
|
* @hash_lpt: the hash of the LPT |
|
* @hmac: HMAC to authenticate the master node |
|
* @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 hash_root_idx[UBIFS_MAX_HASH_LEN]; |
|
__u8 hash_lpt[UBIFS_MAX_HASH_LEN]; |
|
__u8 hmac[UBIFS_MAX_HMAC_LEN]; |
|
__u8 padding[152]; |
|
} __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_auth_node - node for authenticating other nodes |
|
* @ch: common header |
|
* @hmac: The HMAC |
|
*/ |
|
struct ubifs_auth_node { |
|
struct ubifs_ch ch; |
|
__u8 hmac[]; |
|
} __packed; |
|
|
|
/** |
|
* struct ubifs_sig_node - node for signing other nodes |
|
* @ch: common header |
|
* @type: type of the signature, currently only UBIFS_SIGNATURE_TYPE_PKCS7 |
|
* supported |
|
* @len: The length of the signature data |
|
* @padding: reserved for future, zeroes |
|
* @sig: The signature data |
|
*/ |
|
struct ubifs_sig_node { |
|
struct ubifs_ch ch; |
|
__le32 type; |
|
__le32 len; |
|
__u8 padding[32]; |
|
__u8 sig[]; |
|
} __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 |
|
* |
|
* In an authenticated UBIFS we have the hash of the referenced node after @key. |
|
* This can't be added to the struct type definition because @key is a |
|
* dynamically sized element already. |
|
*/ |
|
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__ */
|
|
|