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annotate pirollback/rollback.c @ 50:40b1ae2ab2d7

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pirollback: actual rollback utility implemented, compiles
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Wed, 24 Jul 2013 19:50:24 +0000
parents
children e516128db432
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50
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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 report_inode(ino)
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20 {
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21 struct inode_info *inf = inode + ino;
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22 char pathname[PATHNAME_BUF_SIZE];
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23 int typechar;
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24
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25 switch (inf->type) {
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26 case 0xF1:
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27 typechar = 'f';
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28 break;
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29 case 0xF2:
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30 typechar = 'd';
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31 break;
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32 case 0xF4:
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33 typechar = '.';
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34 break;
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35 default:
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36 fprintf(stderr, "inode #%x: unexpected type %02X\n",
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37 ino, inf->type);
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38 exit(1);
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39 }
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40 if (pathname_of_inode(ino, pathname) < 0)
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41 strcpy(pathname, "-nopath-");
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42 printf("reverting #%04X %c %s\n", ino, typechar, pathname);
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43 }
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44
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45 unlink_inode(oldino, newino, is_sibling)
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46 {
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47 struct inode_info *inf = inode + oldino;
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48 struct inode_flash *fl = inf->flash;
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49 u16 *flashp;
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50
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51 if (is_sibling)
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52 flashp = &fl->sibling;
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53 else
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54 flashp = &fl->descend;
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55 if (le16toh(*flashp) != newino) {
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56 fprintf(stderr,
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57 "fail: %s pointer of inode #%x does not point to #%x as expected\n",
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58 is_sibling ? "sibling" : "descend", oldino, newino);
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59 exit(1);
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60 }
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61 /* unprogram it! */
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62 *flashp = 0xFFFF;
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63 }
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64
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65 resurrect_old_ver(oldino, newino)
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66 {
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67 struct inode_info *old = inode + oldino;
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68 struct inode_info *new = inode + newino;
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69 u8 *typebyte;
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70
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71 if (old->type != new->type || old->parent != new->parent ||
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72 strcmp(old->dataptr, new->dataptr)) {
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73 fprintf(stderr, "inode #%x replacing #%x: mismatch error\n",
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74 newino, oldino);
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75 exit(1);
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76 }
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77 /* the item of interest is the old in-flash type byte */
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78 typebyte = &old->flash->type;
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79 if (*typebyte) {
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80 fprintf(stderr,
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81 "inode #%x to be resurrected: not in deleted state\n",
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82 oldino);
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83 exit(1);
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84 }
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85 /* undo the zeroing */
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86 *typebyte = old->type;
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87 }
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88
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89 roll_back_inode(ino)
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90 {
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91 struct inode_info *inf = inode + ino;
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92
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93 report_inode(ino);
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94 if (!inf->flash->type)
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95 printf("NOTE: object is already in deleted state\n");
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96 /* first order of business: unlink it */
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97 if (inf->j_unlink_ptr < 0)
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98 unlink_inode(-inf->j_unlink_ptr, ino, 0);
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99 else
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100 unlink_inode(inf->j_unlink_ptr, ino, 1);
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101 /* resurrect the previous version */
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102 if (inf->type != 0xF4) {
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103 if (inf->j_oldver)
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104 resurrect_old_ver(inf->j_oldver, ino);
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105 else
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106 printf("NOTE: no previous version to resurrect\n");
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107 } else if (inf->j_oldver) {
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108 fprintf(stderr,
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109 "error: unexpected oldver on inode #%x of type F4\n",
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110 ino);
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111 exit(1);
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112 }
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113 /* reblank the 3 flash areas programmed with this inode */
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114 memset(inf->flash, 0xFF, 16);
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115 memset(inf->jflash, 0xFF, 16);
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116 memset(inf->dataptr, 0xFF, inf->len);
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117 }
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118
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119 write_new_img(outfilename)
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120 char *outfilename;
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121 {
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122 int fd, cc;
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123
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124 fd = open(outfilename, O_WRONLY|O_CREAT|O_TRUNC, 0666);
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125 if (fd < 0) {
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126 perror(outfilename);
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127 exit(1);
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128 }
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129 cc = write(fd, image, sizeof image);
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130 close(fd);
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131 if (cc != sizeof image) {
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132 fprintf(stderr, "error writing to %s\n", outfilename);
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133 exit(1);
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134 }
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135 }
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136
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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137 main(argc, argv)
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138 char **argv;
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139 {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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140 int ino, keep_ino;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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141 char *strtoul_endp;
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142
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143 if (argc != 4) {
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144 usage: fprintf(stderr,
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145 "usage: %s ffs-image inode-to-keep new-image\n",
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146 argv[0]);
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147 exit(1);
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148 }
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149 imgfile = argv[1];
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150 keep_ino = strtoul(argv[2], &strtoul_endp, 16);
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151 if (!argv[2][0] || *strtoul_endp)
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152 goto usage;
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153
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154 read_img_file();
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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155 read_inodes();
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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156 walk_tree();
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157 check_object_names();
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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158 parse_journal();
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diff changeset
159 check_object_names(); /* rerun for "undeleted" objects */
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parents:
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160 if (keep_ino < journal_start_ino || keep_ino > last_inode) {
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parents:
diff changeset
161 fprintf(stderr, "%s: bad inode number specified\n", argv[0]);
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162 exit(1);
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163 }
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parents:
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164 for (ino = last_inode; ino > keep_ino; ino--)
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165 roll_back_inode(ino);
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166 write_new_img(argv[3]);
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parents:
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167 exit(0);
40b1ae2ab2d7 pirollback: actual rollback utility implemented, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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168 }