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include/linux/jffs2.h
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/* * JFFS2 -- Journalling Flash File System, Version 2. * |
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* Copyright © 2001-2007 Red Hat, Inc. * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> |
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* * Created by David Woodhouse <dwmw2@infradead.org> * |
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* For licensing information, see the file 'LICENCE' in the |
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* jffs2 directory. |
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*/ #ifndef __LINUX_JFFS2_H__ #define __LINUX_JFFS2_H__ |
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#include <linux/types.h> |
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#include <linux/magic.h> |
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/* You must include something which defines the C99 uintXX_t types. We don't do it from here because this file is used in too many different environments. */ |
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/* Values we may expect to find in the 'magic' field */ #define JFFS2_OLD_MAGIC_BITMASK 0x1984 #define JFFS2_MAGIC_BITMASK 0x1985 #define KSAMTIB_CIGAM_2SFFJ 0x8519 /* For detecting wrong-endian fs */ #define JFFS2_EMPTY_BITMASK 0xffff #define JFFS2_DIRTY_BITMASK 0x0000 |
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/* Summary node MAGIC marker */ #define JFFS2_SUM_MAGIC 0x02851885 |
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/* We only allow a single char for length, and 0xFF is empty flash so we don't want it confused with a real length. Hence max 254. */ #define JFFS2_MAX_NAME_LEN 254 /* How small can we sensibly write nodes? */ #define JFFS2_MIN_DATA_LEN 128 #define JFFS2_COMPR_NONE 0x00 #define JFFS2_COMPR_ZERO 0x01 #define JFFS2_COMPR_RTIME 0x02 #define JFFS2_COMPR_RUBINMIPS 0x03 #define JFFS2_COMPR_COPY 0x04 #define JFFS2_COMPR_DYNRUBIN 0x05 #define JFFS2_COMPR_ZLIB 0x06 |
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#define JFFS2_COMPR_LZO 0x07 |
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/* Compatibility flags. */ #define JFFS2_COMPAT_MASK 0xc000 /* What do to if an unknown nodetype is found */ #define JFFS2_NODE_ACCURATE 0x2000 /* INCOMPAT: Fail to mount the filesystem */ #define JFFS2_FEATURE_INCOMPAT 0xc000 /* ROCOMPAT: Mount read-only */ #define JFFS2_FEATURE_ROCOMPAT 0x8000 /* RWCOMPAT_COPY: Mount read/write, and copy the node when it's GC'd */ #define JFFS2_FEATURE_RWCOMPAT_COPY 0x4000 /* RWCOMPAT_DELETE: Mount read/write, and delete the node when it's GC'd */ #define JFFS2_FEATURE_RWCOMPAT_DELETE 0x0000 #define JFFS2_NODETYPE_DIRENT (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 1) #define JFFS2_NODETYPE_INODE (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 2) #define JFFS2_NODETYPE_CLEANMARKER (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3) #define JFFS2_NODETYPE_PADDING (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 4) |
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#define JFFS2_NODETYPE_SUMMARY (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 6) |
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#define JFFS2_NODETYPE_XATTR (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 8) #define JFFS2_NODETYPE_XREF (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 9) /* XATTR Related */ #define JFFS2_XPREFIX_USER 1 /* for "user." */ #define JFFS2_XPREFIX_SECURITY 2 /* for "security." */ #define JFFS2_XPREFIX_ACL_ACCESS 3 /* for "system.posix_acl_access" */ #define JFFS2_XPREFIX_ACL_DEFAULT 4 /* for "system.posix_acl_default" */ #define JFFS2_XPREFIX_TRUSTED 5 /* for "trusted.*" */ #define JFFS2_ACL_VERSION 0x0001 |
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// Maybe later... //#define JFFS2_NODETYPE_CHECKPOINT (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3) //#define JFFS2_NODETYPE_OPTIONS (JFFS2_FEATURE_RWCOMPAT_COPY | JFFS2_NODE_ACCURATE | 4) |
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#define JFFS2_INO_FLAG_PREREAD 1 /* Do read_inode() for this one at mount time, don't wait for it to |
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happen later */ |
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#define JFFS2_INO_FLAG_USERCOMPR 2 /* User has requested a specific |
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compression type */ /* These can go once we've made sure we've caught all uses without byteswapping */ typedef struct { |
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__u32 v32; |
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} __attribute__((packed)) jint32_t; |
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typedef struct { |
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__u32 m; |
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} __attribute__((packed)) jmode_t; |
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typedef struct { |
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__u16 v16; |
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} __attribute__((packed)) jint16_t; |
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struct jffs2_unknown_node { /* All start like this */ jint16_t magic; jint16_t nodetype; jint32_t totlen; /* So we can skip over nodes we don't grok */ jint32_t hdr_crc; |
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}; |
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struct jffs2_raw_dirent { jint16_t magic; |
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jint16_t nodetype; /* == JFFS2_NODETYPE_DIRENT */ |
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jint32_t totlen; jint32_t hdr_crc; jint32_t pino; jint32_t version; jint32_t ino; /* == zero for unlink */ jint32_t mctime; |
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__u8 nsize; __u8 type; __u8 unused[2]; |
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jint32_t node_crc; jint32_t name_crc; |
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__u8 name[0]; |
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}; |
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/* The JFFS2 raw inode structure: Used for storage on physical media. */ |
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/* The uid, gid, atime, mtime and ctime members could be longer, but |
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are left like this for space efficiency. If and when people decide they really need them extended, it's simple enough to add support for a new type of raw node. */ struct jffs2_raw_inode { jint16_t magic; /* A constant magic number. */ |
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jint16_t nodetype; /* == JFFS2_NODETYPE_INODE */ |
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jint32_t totlen; /* Total length of this node (inc data, etc.) */ jint32_t hdr_crc; jint32_t ino; /* Inode number. */ jint32_t version; /* Version number. */ jmode_t mode; /* The file's type or mode. */ jint16_t uid; /* The file's owner. */ jint16_t gid; /* The file's group. */ jint32_t isize; /* Total resultant size of this inode (used for truncations) */ jint32_t atime; /* Last access time. */ jint32_t mtime; /* Last modification time. */ jint32_t ctime; /* Change time. */ jint32_t offset; /* Where to begin to write. */ jint32_t csize; /* (Compressed) data size */ jint32_t dsize; /* Size of the node's data. (after decompression) */ |
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__u8 compr; /* Compression algorithm used */ __u8 usercompr; /* Compression algorithm requested by the user */ |
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jint16_t flags; /* See JFFS2_INO_FLAG_* */ jint32_t data_crc; /* CRC for the (compressed) data. */ jint32_t node_crc; /* CRC for the raw inode (excluding data) */ |
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__u8 data[0]; |
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}; |
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struct jffs2_raw_xattr { jint16_t magic; jint16_t nodetype; /* = JFFS2_NODETYPE_XATTR */ jint32_t totlen; jint32_t hdr_crc; jint32_t xid; /* XATTR identifier number */ jint32_t version; |
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__u8 xprefix; __u8 name_len; |
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jint16_t value_len; jint32_t data_crc; jint32_t node_crc; |
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__u8 data[0]; |
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} __attribute__((packed)); struct jffs2_raw_xref { jint16_t magic; jint16_t nodetype; /* = JFFS2_NODETYPE_XREF */ jint32_t totlen; jint32_t hdr_crc; jint32_t ino; /* inode number */ jint32_t xid; /* XATTR identifier number */ |
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jint32_t xseqno; /* xref sequential number */ |
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jint32_t node_crc; } __attribute__((packed)); |
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struct jffs2_raw_summary { |
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jint16_t magic; |
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jint16_t nodetype; /* = JFFS2_NODETYPE_SUMMARY */ |
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jint32_t totlen; jint32_t hdr_crc; jint32_t sum_num; /* number of sum entries*/ jint32_t cln_mkr; /* clean marker size, 0 = no cleanmarker */ jint32_t padded; /* sum of the size of padding nodes */ jint32_t sum_crc; /* summary information crc */ jint32_t node_crc; /* node crc */ jint32_t sum[0]; /* inode summary info */ |
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}; |
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union jffs2_node_union |
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{ |
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struct jffs2_raw_inode i; struct jffs2_raw_dirent d; |
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struct jffs2_raw_xattr x; struct jffs2_raw_xref r; |
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struct jffs2_raw_summary s; |
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struct jffs2_unknown_node u; }; |
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/* Data payload for device nodes. */ union jffs2_device_node { |
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jint16_t old_id; jint32_t new_id; |
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}; |
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#endif /* __LINUX_JFFS2_H__ */ |