FreeCalypso > hg > freecalypso-reveng
annotate pirollback/rollback.c @ 406:1a852266ba74
tfo moved to gsm-net-reveng repository
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 24 May 2024 21:19:59 +0000 |
parents | e516128db432 |
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1 #include <sys/types.h> |
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2 #include <sys/file.h> |
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3 #include <endian.h> |
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4 #include <stdio.h> |
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5 #include <string.h> |
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6 #include <strings.h> |
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7 #include <stdlib.h> |
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8 #include <unistd.h> |
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9 #include "types.h" |
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10 #include "struct.h" |
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11 #include "pathname.h" |
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12 |
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13 extern char *imgfile; |
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14 extern u8 image[0x480000]; |
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15 extern struct inode_info inode[]; |
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16 extern int last_inode; |
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17 extern int journal_start_ino; |
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18 |
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19 static void |
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20 report_inode(ino) |
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21 { |
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22 struct inode_info *inf = inode + ino; |
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23 char pathname[PATHNAME_BUF_SIZE]; |
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24 int typechar; |
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25 |
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26 switch (inf->type) { |
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27 case 0xF1: |
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28 typechar = 'f'; |
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29 break; |
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30 case 0xF2: |
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31 typechar = 'd'; |
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32 break; |
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33 case 0xF4: |
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34 typechar = '.'; |
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35 break; |
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36 default: |
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37 fprintf(stderr, "inode #%x: unexpected type %02X\n", |
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38 ino, inf->type); |
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39 exit(1); |
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40 } |
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41 if (pathname_of_inode(ino, pathname) < 0) |
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42 strcpy(pathname, "-nopath-"); |
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43 printf("reverting #%04X %c %s\n", ino, typechar, pathname); |
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44 } |
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45 |
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46 static void |
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47 unlink_inode(oldino, newino, is_sibling) |
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48 { |
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49 struct inode_info *inf = inode + oldino; |
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50 struct inode_flash *fl = inf->flash; |
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51 u16 *flashp; |
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52 |
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53 if (is_sibling) |
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54 flashp = &fl->sibling; |
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55 else |
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56 flashp = &fl->descend; |
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57 if (le16toh(*flashp) != newino) { |
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58 fprintf(stderr, |
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59 "fail: %s pointer of inode #%x does not point to #%x as expected\n", |
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60 is_sibling ? "sibling" : "descend", oldino, newino); |
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61 exit(1); |
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62 } |
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63 /* unprogram it! */ |
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64 *flashp = 0xFFFF; |
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65 } |
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66 |
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67 static void |
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68 resurrect_descend_chain(headino, ino) |
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69 { |
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70 struct inode_info *inf; |
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71 u8 *typebyte; |
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72 |
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73 for (; ino; ino = inf->descend) { |
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74 inf = inode + ino; |
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75 if (inf->type != 0xF4) { |
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76 fprintf(stderr, |
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77 "error: #%x, descendant of #%x, is not of type F4\n", |
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78 ino, headino); |
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79 exit(1); |
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80 } |
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81 typebyte = &inf->flash->type; |
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82 if (*typebyte) { |
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83 fprintf(stderr, |
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84 "inode #%x to be resurrected: not in deleted state\n", |
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85 ino); |
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86 exit(1); |
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87 } |
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88 /* undo the zeroing */ |
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89 *typebyte = 0xF4; |
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90 } |
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91 } |
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92 |
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93 static void |
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94 resurrect_old_ver(oldino, newino) |
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95 { |
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96 struct inode_info *old = inode + oldino; |
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97 struct inode_info *new = inode + newino; |
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98 u8 *typebyte; |
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99 |
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100 if (old->type != new->type || old->parent != new->parent || |
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101 strcmp(old->dataptr, new->dataptr)) { |
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102 fprintf(stderr, "inode #%x replacing #%x: mismatch error\n", |
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103 newino, oldino); |
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104 exit(1); |
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105 } |
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106 /* the item of interest is the old in-flash type byte */ |
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107 typebyte = &old->flash->type; |
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108 if (*typebyte) { |
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109 fprintf(stderr, |
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110 "inode #%x to be resurrected: not in deleted state\n", |
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111 oldino); |
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112 exit(1); |
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113 } |
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114 /* undo the zeroing */ |
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115 *typebyte = old->type; |
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116 /* |
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117 * Is there a descendant chain (file continuation chunks) |
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118 * to resurrect as well? |
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119 */ |
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120 if (!old->descend) |
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121 return; |
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122 if (old->type != 0xF1) { |
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123 fprintf(stderr, |
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124 "resurrecting inode #%x: unexpected descendant with type != F1\n", |
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125 oldino); |
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126 exit(1); |
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127 } |
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128 resurrect_descend_chain(oldino, old->descend); |
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129 } |
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130 |
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131 roll_back_inode(ino) |
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132 { |
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133 struct inode_info *inf = inode + ino; |
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134 |
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135 report_inode(ino); |
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136 if (!inf->flash->type) |
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137 printf("NOTE: object is already in deleted state\n"); |
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138 /* first order of business: unlink it */ |
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139 if (inf->j_unlink_ptr < 0) |
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140 unlink_inode(-inf->j_unlink_ptr, ino, 0); |
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141 else |
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142 unlink_inode(inf->j_unlink_ptr, ino, 1); |
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143 /* resurrect the previous version */ |
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144 if (inf->type != 0xF4) { |
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145 if (inf->j_oldver) |
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146 resurrect_old_ver(inf->j_oldver, ino); |
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147 else |
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148 printf("NOTE: no previous version to resurrect\n"); |
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149 } else if (inf->j_oldver) { |
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150 fprintf(stderr, |
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151 "error: unexpected oldver on inode #%x of type F4\n", |
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152 ino); |
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153 exit(1); |
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154 } |
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155 /* reblank the 3 flash areas programmed with this inode */ |
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156 memset(inf->flash, 0xFF, 16); |
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157 memset(inf->jflash, 0xFF, 16); |
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158 memset(inf->dataptr, 0xFF, inf->len); |
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159 } |
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160 |
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161 write_new_img(outfilename) |
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162 char *outfilename; |
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163 { |
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164 int fd, cc; |
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165 |
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166 fd = open(outfilename, O_WRONLY|O_CREAT|O_TRUNC, 0666); |
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167 if (fd < 0) { |
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168 perror(outfilename); |
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169 exit(1); |
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170 } |
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171 cc = write(fd, image, sizeof image); |
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172 close(fd); |
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173 if (cc != sizeof image) { |
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174 fprintf(stderr, "error writing to %s\n", outfilename); |
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175 exit(1); |
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176 } |
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177 } |
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178 |
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179 main(argc, argv) |
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180 char **argv; |
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181 { |
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182 int ino, keep_ino; |
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183 char *strtoul_endp; |
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184 |
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185 if (argc != 4) { |
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186 usage: fprintf(stderr, |
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187 "usage: %s ffs-image inode-to-keep new-image\n", |
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188 argv[0]); |
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189 exit(1); |
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190 } |
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191 imgfile = argv[1]; |
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192 keep_ino = strtoul(argv[2], &strtoul_endp, 16); |
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193 if (!argv[2][0] || *strtoul_endp) |
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194 goto usage; |
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195 |
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196 read_img_file(); |
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197 read_inodes(); |
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198 walk_tree(); |
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199 check_object_names(); |
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200 parse_journal(); |
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201 check_object_names(); /* rerun for "undeleted" objects */ |
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202 if (keep_ino < journal_start_ino || keep_ino > last_inode) { |
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203 fprintf(stderr, "%s: bad inode number specified\n", argv[0]); |
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204 exit(1); |
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205 } |
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206 for (ino = last_inode; ino > keep_ino; ino--) |
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207 roll_back_inode(ino); |
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208 write_new_img(argv[3]); |
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209 exit(0); |
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210 } |