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git01.mediatek.com / filogic / uboot / 30bb7e97efc4ea17551c36e0185679cf65892a80 / . / fs / jffs2 / summary.h
blob: 834933cd15846908e550793031bf8773282587f1 [file] [log] [blame]
Ilya Yanoka933bd62008-11-13 19:49:35 +0300[diff] [blame]1/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright © 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>,
5 * Zoltan Sogor <weth@inf.u-szeged.hu>,
6 * Patrik Kluba <pajko@halom.u-szeged.hu>,
7 * University of Szeged, Hungary
8 *
9 * For licensing information, see the file 'LICENCE' in this directory.
10 *
11 */
12
13#ifndef JFFS2_SUMMARY_H
14#define JFFS2_SUMMARY_H
15
16#define BLK_STATE_ALLFF 0
17#define BLK_STATE_CLEAN 1
18#define BLK_STATE_PARTDIRTY 2
19#define BLK_STATE_CLEANMARKER 3
20#define BLK_STATE_ALLDIRTY 4
21#define BLK_STATE_BADBLOCK 5
22
23#define JFFS2_SUMMARY_NOSUM_SIZE 0xffffffff
24#define JFFS2_SUMMARY_INODE_SIZE (sizeof(struct jffs2_sum_inode_flash))
25#define JFFS2_SUMMARY_DIRENT_SIZE(x) (sizeof(struct jffs2_sum_dirent_flash) + (x))
26#define JFFS2_SUMMARY_XATTR_SIZE (sizeof(struct jffs2_sum_xattr_flash))
27#define JFFS2_SUMMARY_XREF_SIZE (sizeof(struct jffs2_sum_xref_flash))
28
29/* Summary structures used on flash */
30
31struct jffs2_sum_unknown_flash
32{
33 __u16 nodetype; /* node type */
34};
35
36struct jffs2_sum_inode_flash
37{
38 __u16 nodetype; /* node type */
39 __u32 inode; /* inode number */
40 __u32 version; /* inode version */
41 __u32 offset; /* offset on jeb */
42 __u32 totlen; /* record length */
43} __attribute__((packed));
44
45struct jffs2_sum_dirent_flash
46{
47 __u16 nodetype; /* == JFFS_NODETYPE_DIRENT */
48 __u32 totlen; /* record length */
49 __u32 offset; /* offset on jeb */
50 __u32 pino; /* parent inode */
51 __u32 version; /* dirent version */
52 __u32 ino; /* == zero for unlink */
53 uint8_t nsize; /* dirent name size */
54 uint8_t type; /* dirent type */
55 uint8_t name[0]; /* dirent name */
56} __attribute__((packed));
57
58struct jffs2_sum_xattr_flash
59{
60 __u16 nodetype; /* == JFFS2_NODETYPE_XATR */
61 __u32 xid; /* xattr identifier */
62 __u32 version; /* version number */
63 __u32 offset; /* offset on jeb */
64 __u32 totlen; /* node length */
65} __attribute__((packed));
66
67struct jffs2_sum_xref_flash
68{
69 __u16 nodetype; /* == JFFS2_NODETYPE_XREF */
70 __u32 offset; /* offset on jeb */
71} __attribute__((packed));
72
73union jffs2_sum_flash
74{
75 struct jffs2_sum_unknown_flash u;
76 struct jffs2_sum_inode_flash i;
77 struct jffs2_sum_dirent_flash d;
78 struct jffs2_sum_xattr_flash x;
79 struct jffs2_sum_xref_flash r;
80};
81
82/* Summary structures used in the memory */
83
84struct jffs2_sum_unknown_mem
85{
86 union jffs2_sum_mem *next;
87 __u16 nodetype; /* node type */
88};
89
90struct jffs2_sum_inode_mem
91{
92 union jffs2_sum_mem *next;
93 __u16 nodetype; /* node type */
94 __u32 inode; /* inode number */
95 __u32 version; /* inode version */
96 __u32 offset; /* offset on jeb */
97 __u32 totlen; /* record length */
98} __attribute__((packed));
99
100struct jffs2_sum_dirent_mem
101{
102 union jffs2_sum_mem *next;
103 __u16 nodetype; /* == JFFS_NODETYPE_DIRENT */
104 __u32 totlen; /* record length */
105 __u32 offset; /* ofset on jeb */
106 __u32 pino; /* parent inode */
107 __u32 version; /* dirent version */
108 __u32 ino; /* == zero for unlink */
109 uint8_t nsize; /* dirent name size */
110 uint8_t type; /* dirent type */
111 uint8_t name[0]; /* dirent name */
112} __attribute__((packed));
113
114struct jffs2_sum_xattr_mem
115{
116 union jffs2_sum_mem *next;
117 __u16 nodetype;
118 __u32 xid;
119 __u32 version;
120 __u32 offset;
121 __u32 totlen;
122} __attribute__((packed));
123
124struct jffs2_sum_xref_mem
125{
126 union jffs2_sum_mem *next;
127 __u16 nodetype;
128 __u32 offset;
129} __attribute__((packed));
130
131union jffs2_sum_mem
132{
133 struct jffs2_sum_unknown_mem u;
134 struct jffs2_sum_inode_mem i;
135 struct jffs2_sum_dirent_mem d;
136 struct jffs2_sum_xattr_mem x;
137 struct jffs2_sum_xref_mem r;
138};
139
140/* Summary related information stored in superblock */
141
142struct jffs2_summary
143{
144 uint32_t sum_size; /* collected summary information for nextblock */
145 uint32_t sum_num;
146 uint32_t sum_padded;
147 union jffs2_sum_mem *sum_list_head;
148 union jffs2_sum_mem *sum_list_tail;
149
150 __u32 *sum_buf; /* buffer for writing out summary */
151};
152
153/* Summary marker is stored at the end of every sumarized erase block */
154
155struct jffs2_sum_marker
156{
157 __u32 offset; /* offset of the summary node in the jeb */
158 __u32 magic; /* == JFFS2_SUM_MAGIC */
159};
160
161#define JFFS2_SUMMARY_FRAME_SIZE (sizeof(struct jffs2_raw_summary) + sizeof(struct jffs2_sum_marker))
162
163#endif /* JFFS2_SUMMARY_H */