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annotate pirollback/rollback.c @ 371:c7514c8b5b41

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pirelli/headset: plug insertion detection figured out
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 14 Jun 2021 01:33:48 +0000
parents e516128db432
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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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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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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168 perror(outfilename);
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169 exit(1);
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170 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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171 cc = write(fd, image, sizeof image);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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172 close(fd);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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173 if (cc != sizeof image) {
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diff changeset
174 fprintf(stderr, "error writing to %s\n", outfilename);
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175 exit(1);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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176 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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177 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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178
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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179 main(argc, argv)
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180 char **argv;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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181 {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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182 int ino, keep_ino;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
183 char *strtoul_endp;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
184
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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diff changeset
185 if (argc != 4) {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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186 usage: fprintf(stderr,
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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187 "usage: %s ffs-image inode-to-keep new-image\n",
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
188 argv[0]);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
189 exit(1);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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190 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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191 imgfile = argv[1];
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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192 keep_ino = strtoul(argv[2], &strtoul_endp, 16);
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parents:
diff changeset
193 if (!argv[2][0] || *strtoul_endp)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
194 goto usage;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
195
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
196 read_img_file();
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
197 read_inodes();
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
198 walk_tree();
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
199 check_object_names();
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
200 parse_journal();
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
201 check_object_names(); /* rerun for "undeleted" objects */
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
202 if (keep_ino < journal_start_ino || keep_ino > last_inode) {
40b1ae2ab2d7 pirollback: actual rollback utility implemented, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
203 fprintf(stderr, "%s: bad inode number specified\n", argv[0]);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
204 exit(1);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
205 }
40b1ae2ab2d7 pirollback: actual rollback utility implemented, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
206 for (ino = last_inode; ino > keep_ino; ino--)
40b1ae2ab2d7 pirollback: actual rollback utility implemented, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
207 roll_back_inode(ino);
40b1ae2ab2d7 pirollback: actual rollback utility implemented, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
208 write_new_img(argv[3]);
40b1ae2ab2d7 pirollback: actual rollback utility implemented, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
209 exit(0);
40b1ae2ab2d7 pirollback: actual rollback utility implemented, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
210 }