1 | /* |
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2 | * JFFS2 -- Journalling Flash File System, Version 2. |
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3 | * |
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4 | * Copyright © 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>, |
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5 | * Zoltan Sogor <weth@inf.u-szeged.hu>, |
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6 | * Patrik Kluba <pajko@halom.u-szeged.hu>, |
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7 | * University of Szeged, Hungary |
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8 | * |
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9 | * For licensing information, see the file 'LICENCE' in this directory. |
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10 | * |
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11 | */ |
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12 | |
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13 | #ifndef JFFS2_SUMMARY_H |
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14 | #define JFFS2_SUMMARY_H |
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15 | |
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16 | /* Limit summary size to 64KiB so that we can kmalloc it. If the summary |
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17 | is larger than that, we have to just ditch it and avoid using summary |
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18 | for the eraseblock in question... and it probably doesn't hurt us much |
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19 | anyway. */ |
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20 | #define MAX_SUMMARY_SIZE 65536 |
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21 | |
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22 | #include <linux/uio.h> |
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23 | #include <linux/jffs2.h> |
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24 | |
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25 | #define BLK_STATE_ALLFF 0 |
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26 | #define BLK_STATE_CLEAN 1 |
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27 | #define BLK_STATE_PARTDIRTY 2 |
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28 | #define BLK_STATE_CLEANMARKER 3 |
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29 | #define BLK_STATE_ALLDIRTY 4 |
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30 | #define BLK_STATE_BADBLOCK 5 |
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31 | |
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32 | #define JFFS2_SUMMARY_NOSUM_SIZE 0xffffffff |
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33 | #define JFFS2_SUMMARY_INODE_SIZE (sizeof(struct jffs2_sum_inode_flash)) |
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34 | #define JFFS2_SUMMARY_DIRENT_SIZE(x) (sizeof(struct jffs2_sum_dirent_flash) + (x)) |
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35 | #define JFFS2_SUMMARY_XATTR_SIZE (sizeof(struct jffs2_sum_xattr_flash)) |
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36 | #define JFFS2_SUMMARY_XREF_SIZE (sizeof(struct jffs2_sum_xref_flash)) |
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37 | |
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38 | /* Summary structures used on flash */ |
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39 | |
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40 | struct jffs2_sum_unknown_flash |
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41 | { |
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42 | jint16_t nodetype; /* node type */ |
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43 | }; |
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44 | |
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45 | struct jffs2_sum_inode_flash |
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46 | { |
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47 | jint16_t nodetype; /* node type */ |
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48 | jint32_t inode; /* inode number */ |
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49 | jint32_t version; /* inode version */ |
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50 | jint32_t offset; /* offset on jeb */ |
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51 | jint32_t totlen; /* record length */ |
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52 | } __attribute__((packed)); |
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53 | |
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54 | struct jffs2_sum_dirent_flash |
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55 | { |
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56 | jint16_t nodetype; /* == JFFS_NODETYPE_DIRENT */ |
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57 | jint32_t totlen; /* record length */ |
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58 | jint32_t offset; /* offset on jeb */ |
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59 | jint32_t pino; /* parent inode */ |
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60 | jint32_t version; /* dirent version */ |
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61 | jint32_t ino; /* == zero for unlink */ |
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62 | uint8_t nsize; /* dirent name size */ |
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63 | uint8_t type; /* dirent type */ |
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64 | uint8_t name[0]; /* dirent name */ |
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65 | } __attribute__((packed)); |
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66 | |
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67 | struct jffs2_sum_xattr_flash |
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68 | { |
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69 | jint16_t nodetype; /* == JFFS2_NODETYPE_XATR */ |
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70 | jint32_t xid; /* xattr identifier */ |
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71 | jint32_t version; /* version number */ |
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72 | jint32_t offset; /* offset on jeb */ |
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73 | jint32_t totlen; /* node length */ |
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74 | } __attribute__((packed)); |
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75 | |
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76 | struct jffs2_sum_xref_flash |
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77 | { |
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78 | jint16_t nodetype; /* == JFFS2_NODETYPE_XREF */ |
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79 | jint32_t offset; /* offset on jeb */ |
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80 | } __attribute__((packed)); |
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81 | |
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82 | union jffs2_sum_flash |
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83 | { |
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84 | struct jffs2_sum_unknown_flash u; |
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85 | struct jffs2_sum_inode_flash i; |
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86 | struct jffs2_sum_dirent_flash d; |
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87 | struct jffs2_sum_xattr_flash x; |
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88 | struct jffs2_sum_xref_flash r; |
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89 | }; |
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90 | |
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91 | /* Summary structures used in the memory */ |
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92 | |
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93 | struct jffs2_sum_unknown_mem |
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94 | { |
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95 | union jffs2_sum_mem *next; |
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96 | jint16_t nodetype; /* node type */ |
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97 | }; |
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98 | |
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99 | struct jffs2_sum_inode_mem |
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100 | { |
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101 | union jffs2_sum_mem *next; |
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102 | jint16_t nodetype; /* node type */ |
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103 | jint32_t inode; /* inode number */ |
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104 | jint32_t version; /* inode version */ |
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105 | jint32_t offset; /* offset on jeb */ |
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106 | jint32_t totlen; /* record length */ |
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107 | } __attribute__((packed)); |
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108 | |
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109 | struct jffs2_sum_dirent_mem |
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110 | { |
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111 | union jffs2_sum_mem *next; |
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112 | jint16_t nodetype; /* == JFFS_NODETYPE_DIRENT */ |
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113 | jint32_t totlen; /* record length */ |
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114 | jint32_t offset; /* ofset on jeb */ |
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115 | jint32_t pino; /* parent inode */ |
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116 | jint32_t version; /* dirent version */ |
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117 | jint32_t ino; /* == zero for unlink */ |
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118 | uint8_t nsize; /* dirent name size */ |
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119 | uint8_t type; /* dirent type */ |
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120 | uint8_t name[0]; /* dirent name */ |
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121 | } __attribute__((packed)); |
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122 | |
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123 | struct jffs2_sum_xattr_mem |
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124 | { |
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125 | union jffs2_sum_mem *next; |
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126 | jint16_t nodetype; |
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127 | jint32_t xid; |
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128 | jint32_t version; |
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129 | jint32_t offset; |
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130 | jint32_t totlen; |
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131 | } __attribute__((packed)); |
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132 | |
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133 | struct jffs2_sum_xref_mem |
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134 | { |
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135 | union jffs2_sum_mem *next; |
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136 | jint16_t nodetype; |
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137 | jint32_t offset; |
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138 | } __attribute__((packed)); |
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139 | |
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140 | union jffs2_sum_mem |
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141 | { |
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142 | struct jffs2_sum_unknown_mem u; |
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143 | struct jffs2_sum_inode_mem i; |
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144 | struct jffs2_sum_dirent_mem d; |
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145 | struct jffs2_sum_xattr_mem x; |
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146 | struct jffs2_sum_xref_mem r; |
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147 | }; |
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148 | |
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149 | /* Summary related information stored in superblock */ |
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150 | |
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151 | struct jffs2_summary |
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152 | { |
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153 | uint32_t sum_size; /* collected summary information for nextblock */ |
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154 | uint32_t sum_num; |
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155 | uint32_t sum_padded; |
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156 | union jffs2_sum_mem *sum_list_head; |
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157 | union jffs2_sum_mem *sum_list_tail; |
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158 | |
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159 | jint32_t *sum_buf; /* buffer for writing out summary */ |
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160 | }; |
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161 | |
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162 | /* Summary marker is stored at the end of every sumarized erase block */ |
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163 | |
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164 | struct jffs2_sum_marker |
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165 | { |
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166 | jint32_t offset; /* offset of the summary node in the jeb */ |
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167 | jint32_t magic; /* == JFFS2_SUM_MAGIC */ |
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168 | }; |
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169 | |
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170 | #define JFFS2_SUMMARY_FRAME_SIZE (sizeof(struct jffs2_raw_summary) + sizeof(struct jffs2_sum_marker)) |
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171 | |
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172 | #ifdef CONFIG_JFFS2_SUMMARY /* SUMMARY SUPPORT ENABLED */ |
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173 | |
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174 | #define jffs2_sum_active() (1) |
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175 | int jffs2_sum_init(struct jffs2_sb_info *c); |
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176 | void jffs2_sum_exit(struct jffs2_sb_info *c); |
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177 | void jffs2_sum_disable_collecting(struct jffs2_summary *s); |
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178 | int jffs2_sum_is_disabled(struct jffs2_summary *s); |
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179 | void jffs2_sum_reset_collected(struct jffs2_summary *s); |
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180 | void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s); |
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181 | int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs, |
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182 | unsigned long count, uint32_t to); |
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183 | int jffs2_sum_write_sumnode(struct jffs2_sb_info *c); |
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184 | int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size); |
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185 | int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri, uint32_t ofs); |
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186 | int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd, uint32_t ofs); |
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187 | int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs); |
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188 | int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs); |
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189 | int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
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190 | struct jffs2_raw_summary *summary, uint32_t sumlen, |
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191 | uint32_t *pseudo_random); |
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192 | |
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193 | #else /* SUMMARY DISABLED */ |
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194 | |
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195 | #define jffs2_sum_active() (0) |
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196 | #define jffs2_sum_init(a) (0) |
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197 | #define jffs2_sum_exit(a) |
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198 | #define jffs2_sum_disable_collecting(a) |
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199 | #define jffs2_sum_is_disabled(a) (0) |
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200 | #define jffs2_sum_reset_collected(a) |
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201 | #define jffs2_sum_add_kvec(a,b,c,d) (0) |
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202 | #define jffs2_sum_move_collected(a,b) |
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203 | #define jffs2_sum_write_sumnode(a) (0) |
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204 | #define jffs2_sum_add_padding_mem(a,b) |
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205 | #define jffs2_sum_add_inode_mem(a,b,c) |
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206 | #define jffs2_sum_add_dirent_mem(a,b,c) |
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207 | #define jffs2_sum_add_xattr_mem(a,b,c) |
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208 | #define jffs2_sum_add_xref_mem(a,b,c) |
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209 | #define jffs2_sum_scan_sumnode(a,b,c,d,e) (0) |
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210 | |
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211 | #endif /* CONFIG_JFFS2_SUMMARY */ |
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212 | |
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213 | #endif /* JFFS2_SUMMARY_H */ |
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