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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 | /* Limit summary size to 64KiB so that we can kmalloc it. If the summary |
17 | is larger than that, we have to just ditch it and avoid using summary |
18 | for the eraseblock in question... and it probably doesn't hurt us much |
19 | anyway. */ |
20 | #define MAX_SUMMARY_SIZE 65536 |
21 | |
22 | #include <linux/uio.h> |
23 | #include <linux/jffs2.h> |
24 | |
25 | #define BLK_STATE_ALLFF 0 |
26 | #define BLK_STATE_CLEAN 1 |
27 | #define BLK_STATE_PARTDIRTY 2 |
28 | #define BLK_STATE_CLEANMARKER 3 |
29 | #define BLK_STATE_ALLDIRTY 4 |
30 | #define BLK_STATE_BADBLOCK 5 |
31 | |
32 | #define JFFS2_SUMMARY_NOSUM_SIZE 0xffffffff |
33 | #define JFFS2_SUMMARY_INODE_SIZE (sizeof(struct jffs2_sum_inode_flash)) |
34 | #define JFFS2_SUMMARY_DIRENT_SIZE(x) (sizeof(struct jffs2_sum_dirent_flash) + (x)) |
35 | #define JFFS2_SUMMARY_XATTR_SIZE (sizeof(struct jffs2_sum_xattr_flash)) |
36 | #define JFFS2_SUMMARY_XREF_SIZE (sizeof(struct jffs2_sum_xref_flash)) |
37 | |
38 | /* Summary structures used on flash */ |
39 | |
40 | struct jffs2_sum_unknown_flash |
41 | { |
42 | jint16_t nodetype; /* node type */ |
43 | }; |
44 | |
45 | struct jffs2_sum_inode_flash |
46 | { |
47 | jint16_t nodetype; /* node type */ |
48 | jint32_t inode; /* inode number */ |
49 | jint32_t version; /* inode version */ |
50 | jint32_t offset; /* offset on jeb */ |
51 | jint32_t totlen; /* record length */ |
52 | } __attribute__((packed)); |
53 | |
54 | struct jffs2_sum_dirent_flash |
55 | { |
56 | jint16_t nodetype; /* == JFFS_NODETYPE_DIRENT */ |
57 | jint32_t totlen; /* record length */ |
58 | jint32_t offset; /* offset on jeb */ |
59 | jint32_t pino; /* parent inode */ |
60 | jint32_t version; /* dirent version */ |
61 | jint32_t ino; /* == zero for unlink */ |
62 | uint8_t nsize; /* dirent name size */ |
63 | uint8_t type; /* dirent type */ |
64 | uint8_t name[0]; /* dirent name */ |
65 | } __attribute__((packed)); |
66 | |
67 | struct jffs2_sum_xattr_flash |
68 | { |
69 | jint16_t nodetype; /* == JFFS2_NODETYPE_XATR */ |
70 | jint32_t xid; /* xattr identifier */ |
71 | jint32_t version; /* version number */ |
72 | jint32_t offset; /* offset on jeb */ |
73 | jint32_t totlen; /* node length */ |
74 | } __attribute__((packed)); |
75 | |
76 | struct jffs2_sum_xref_flash |
77 | { |
78 | jint16_t nodetype; /* == JFFS2_NODETYPE_XREF */ |
79 | jint32_t offset; /* offset on jeb */ |
80 | } __attribute__((packed)); |
81 | |
82 | union jffs2_sum_flash |
83 | { |
84 | struct jffs2_sum_unknown_flash u; |
85 | struct jffs2_sum_inode_flash i; |
86 | struct jffs2_sum_dirent_flash d; |
87 | struct jffs2_sum_xattr_flash x; |
88 | struct jffs2_sum_xref_flash r; |
89 | }; |
90 | |
91 | /* Summary structures used in the memory */ |
92 | |
93 | struct jffs2_sum_unknown_mem |
94 | { |
95 | union jffs2_sum_mem *next; |
96 | jint16_t nodetype; /* node type */ |
97 | }; |
98 | |
99 | struct jffs2_sum_inode_mem |
100 | { |
101 | union jffs2_sum_mem *next; |
102 | jint16_t nodetype; /* node type */ |
103 | jint32_t inode; /* inode number */ |
104 | jint32_t version; /* inode version */ |
105 | jint32_t offset; /* offset on jeb */ |
106 | jint32_t totlen; /* record length */ |
107 | } __attribute__((packed)); |
108 | |
109 | struct jffs2_sum_dirent_mem |
110 | { |
111 | union jffs2_sum_mem *next; |
112 | jint16_t nodetype; /* == JFFS_NODETYPE_DIRENT */ |
113 | jint32_t totlen; /* record length */ |
114 | jint32_t offset; /* ofset on jeb */ |
115 | jint32_t pino; /* parent inode */ |
116 | jint32_t version; /* dirent version */ |
117 | jint32_t ino; /* == zero for unlink */ |
118 | uint8_t nsize; /* dirent name size */ |
119 | uint8_t type; /* dirent type */ |
120 | uint8_t name[0]; /* dirent name */ |
121 | } __attribute__((packed)); |
122 | |
123 | struct jffs2_sum_xattr_mem |
124 | { |
125 | union jffs2_sum_mem *next; |
126 | jint16_t nodetype; |
127 | jint32_t xid; |
128 | jint32_t version; |
129 | jint32_t offset; |
130 | jint32_t totlen; |
131 | } __attribute__((packed)); |
132 | |
133 | struct jffs2_sum_xref_mem |
134 | { |
135 | union jffs2_sum_mem *next; |
136 | jint16_t nodetype; |
137 | jint32_t offset; |
138 | } __attribute__((packed)); |
139 | |
140 | union jffs2_sum_mem |
141 | { |
142 | struct jffs2_sum_unknown_mem u; |
143 | struct jffs2_sum_inode_mem i; |
144 | struct jffs2_sum_dirent_mem d; |
145 | struct jffs2_sum_xattr_mem x; |
146 | struct jffs2_sum_xref_mem r; |
147 | }; |
148 | |
149 | /* Summary related information stored in superblock */ |
150 | |
151 | struct jffs2_summary |
152 | { |
153 | uint32_t sum_size; /* collected summary information for nextblock */ |
154 | uint32_t sum_num; |
155 | uint32_t sum_padded; |
156 | union jffs2_sum_mem *sum_list_head; |
157 | union jffs2_sum_mem *sum_list_tail; |
158 | |
159 | jint32_t *sum_buf; /* buffer for writing out summary */ |
160 | }; |
161 | |
162 | /* Summary marker is stored at the end of every sumarized erase block */ |
163 | |
164 | struct jffs2_sum_marker |
165 | { |
166 | jint32_t offset; /* offset of the summary node in the jeb */ |
167 | jint32_t magic; /* == JFFS2_SUM_MAGIC */ |
168 | }; |
169 | |
170 | #define JFFS2_SUMMARY_FRAME_SIZE (sizeof(struct jffs2_raw_summary) + sizeof(struct jffs2_sum_marker)) |
171 | |
172 | #ifdef CONFIG_JFFS2_SUMMARY /* SUMMARY SUPPORT ENABLED */ |
173 | |
174 | #define jffs2_sum_active() (1) |
175 | int jffs2_sum_init(struct jffs2_sb_info *c); |
176 | void jffs2_sum_exit(struct jffs2_sb_info *c); |
177 | void jffs2_sum_disable_collecting(struct jffs2_summary *s); |
178 | int jffs2_sum_is_disabled(struct jffs2_summary *s); |
179 | void jffs2_sum_reset_collected(struct jffs2_summary *s); |
180 | void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s); |
181 | int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs, |
182 | unsigned long count, uint32_t to); |
183 | int jffs2_sum_write_sumnode(struct jffs2_sb_info *c); |
184 | int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size); |
185 | int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri, uint32_t ofs); |
186 | int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd, uint32_t ofs); |
187 | int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs); |
188 | int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs); |
189 | int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
190 | struct jffs2_raw_summary *summary, uint32_t sumlen, |
191 | uint32_t *pseudo_random); |
192 | |
193 | #else /* SUMMARY DISABLED */ |
194 | |
195 | #define jffs2_sum_active() (0) |
196 | #define jffs2_sum_init(a) (0) |
197 | #define jffs2_sum_exit(a) |
198 | #define jffs2_sum_disable_collecting(a) |
199 | #define jffs2_sum_is_disabled(a) (0) |
200 | #define jffs2_sum_reset_collected(a) |
201 | #define jffs2_sum_add_kvec(a,b,c,d) (0) |
202 | #define jffs2_sum_move_collected(a,b) |
203 | #define jffs2_sum_write_sumnode(a) (0) |
204 | #define jffs2_sum_add_padding_mem(a,b) |
205 | #define jffs2_sum_add_inode_mem(a,b,c) |
206 | #define jffs2_sum_add_dirent_mem(a,b,c) |
207 | #define jffs2_sum_add_xattr_mem(a,b,c) |
208 | #define jffs2_sum_add_xref_mem(a,b,c) |
209 | #define jffs2_sum_scan_sumnode(a,b,c,d,e) (0) |
210 | |
211 | #endif /* CONFIG_JFFS2_SUMMARY */ |
212 | |
213 | #endif /* JFFS2_SUMMARY_H */ |
214 |
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