Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 1 | /* |
| 2 | * pass2.c --- check directory structure |
| 3 | * |
| 4 | * Copyright (C) 1993, 1994 Theodore Ts'o. This file may be |
| 5 | * redistributed under the terms of the GNU Public License. |
| 6 | * |
| 7 | * Pass 2 of e2fsck iterates through all active directory inodes, and |
| 8 | * applies to following tests to each directory entry in the directory |
| 9 | * blocks in the inodes: |
| 10 | * |
| 11 | * - The length of the directory entry (rec_len) should be at |
| 12 | * least 8 bytes, and no more than the remaining space |
| 13 | * left in the directory block. |
| 14 | * - The length of the name in the directory entry (name_len) |
| 15 | * should be less than (rec_len - 8). |
| 16 | * - The inode number in the directory entry should be within |
| 17 | * legal bounds. |
| 18 | * - The inode number should refer to a in-use inode. |
| 19 | * - The first entry should be '.', and its inode should be |
| 20 | * the inode of the directory. |
| 21 | * - The second entry should be '..'. |
| 22 | * |
| 23 | * To minimize disk seek time, the directory blocks are processed in |
| 24 | * sorted order of block numbers. |
| 25 | * |
| 26 | * Pass 2 also collects the following information: |
| 27 | * - The inode numbers of the subdirectories for each directory. |
| 28 | * |
| 29 | * Pass 2 relies on the following information from previous passes: |
| 30 | * - The directory information collected in pass 1. |
| 31 | * - The inode_used_map bitmap |
| 32 | * - The inode_bad_map bitmap |
| 33 | * - The inode_dir_map bitmap |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 34 | * |
| 35 | * Pass 2 frees the following data structures |
| 36 | * - The inode_bad_map bitmap |
| 37 | */ |
| 38 | |
| 39 | #include "et/com_err.h" |
| 40 | |
| 41 | #include "e2fsck.h" |
| 42 | |
| 43 | /* |
| 44 | * Keeps track of how many times an inode is referenced. |
| 45 | */ |
| 46 | unsigned short * inode_count; |
| 47 | |
| 48 | static void deallocate_inode(ext2_filsys fs, ino_t ino, |
| 49 | char* block_buf); |
| 50 | static int process_bad_inode(ext2_filsys fs, ino_t dir, ino_t ino); |
| 51 | static int check_dir_block(ext2_filsys fs, |
| 52 | struct dir_block_struct *dir_blocks_info, |
| 53 | char *buf); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 54 | static int allocate_dir_block(ext2_filsys fs, |
| 55 | struct dir_block_struct *dir_blocks_info, |
| 56 | char *buf); |
| 57 | static int update_dir_block(ext2_filsys fs, |
| 58 | blk_t *block_nr, |
| 59 | int blockcnt, |
| 60 | void *private); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 61 | |
| 62 | void pass2(ext2_filsys fs) |
| 63 | { |
| 64 | int i; |
| 65 | char *buf; |
| 66 | struct resource_track rtrack; |
| 67 | |
| 68 | init_resource_track(&rtrack); |
| 69 | |
| 70 | #ifdef MTRACE |
| 71 | mtrace_print("Pass 2"); |
| 72 | #endif |
| 73 | |
| 74 | if (!preen) |
| 75 | printf("Pass 2: Checking directory structure\n"); |
| 76 | inode_count = allocate_memory((fs->super->s_inodes_count + 1) * |
| 77 | sizeof(unsigned short), |
| 78 | "buffer for inode count"); |
| 79 | |
| 80 | buf = allocate_memory(fs->blocksize, "directory scan buffer"); |
| 81 | |
| 82 | for (i=0; i < dir_block_count; i++) |
| 83 | check_dir_block(fs, &dir_blocks[i], buf); |
| 84 | |
| 85 | free(buf); |
| 86 | free(dir_blocks); |
| 87 | if (inode_bad_map) { |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 88 | ext2fs_free_inode_bitmap(inode_bad_map); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 89 | inode_bad_map = 0; |
| 90 | } |
| 91 | if (tflag > 1) { |
| 92 | printf("Pass 2: "); |
| 93 | print_resource_track(&rtrack); |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | /* |
| 98 | * Make sure the first entry in the directory is '.', and that the |
| 99 | * directory entry is sane. |
| 100 | */ |
| 101 | static int check_dot(ext2_filsys fs, |
| 102 | struct ext2_dir_entry *dirent, |
| 103 | ino_t ino) |
| 104 | { |
| 105 | struct ext2_dir_entry *nextdir; |
| 106 | int status = 0; |
| 107 | int created = 0; |
| 108 | int new_len; |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 109 | const char *question = 0; |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 110 | |
| 111 | if (!dirent->inode) { |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 112 | printf("Missing '.' in directory inode %lu.\n", ino); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 113 | question = "Fix"; |
| 114 | } else if ((dirent->name_len != 1) || |
| 115 | strncmp(dirent->name, ".", dirent->name_len)) { |
| 116 | char *name = malloc(dirent->name_len + 1); |
| 117 | if (!name) |
| 118 | fatal_error("Couldn't allocate . name"); |
| 119 | strncpy(name, dirent->name, dirent->name_len); |
| 120 | name[dirent->name_len] = '\0'; |
| 121 | printf("First entry in directory inode %lu contains '%s' " |
| 122 | "(inode=%u)\n", ino, name, dirent->inode); |
| 123 | printf("instead of '.'.\n"); |
| 124 | free(name); |
| 125 | question = "Change to be '.'"; |
| 126 | } |
| 127 | if (question) { |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 128 | if (dirent->rec_len < 12) |
| 129 | fatal_error("Cannot fix, insufficient space to add '.'"); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 130 | preenhalt(fs); |
| 131 | if (ask(question, 1)) { |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 132 | dirent->inode = ino; |
| 133 | dirent->name_len = 1; |
| 134 | dirent->name[0] = '.'; |
| 135 | status = 1; |
| 136 | created = 1; |
| 137 | } else { |
| 138 | ext2fs_unmark_valid(fs); |
| 139 | return 0; |
| 140 | } |
| 141 | } |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 142 | if (dirent->inode != ino) { |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 143 | printf("Bad inode number for '.' in directory inode %lu.\n", |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 144 | ino); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 145 | preenhalt(fs); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 146 | if (ask("Fix", 1)) { |
| 147 | dirent->inode = ino; |
| 148 | status = 1; |
| 149 | } else |
| 150 | ext2fs_unmark_valid(fs); |
| 151 | } |
| 152 | if (dirent->rec_len > 12) { |
| 153 | new_len = dirent->rec_len - 12; |
| 154 | if (new_len > 12) { |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 155 | preenhalt(fs); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 156 | if (created || |
| 157 | ask("Directory entry for '.' is big. Split", 1)) { |
| 158 | nextdir = (struct ext2_dir_entry *) |
| 159 | ((char *) dirent + 12); |
| 160 | dirent->rec_len = 12; |
| 161 | nextdir->rec_len = new_len; |
| 162 | nextdir->inode = 0; |
| 163 | nextdir->name_len = 0; |
| 164 | status = 1; |
| 165 | } |
| 166 | } |
| 167 | } |
| 168 | return status; |
| 169 | } |
| 170 | |
| 171 | /* |
| 172 | * Make sure the second entry in the directory is '..', and that the |
| 173 | * directory entry is sane. We do not check the inode number of '..' |
| 174 | * here; this gets done in pass 3. |
| 175 | */ |
| 176 | static int check_dotdot(ext2_filsys fs, |
| 177 | struct ext2_dir_entry *dirent, |
| 178 | struct dir_info *dir) |
| 179 | { |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 180 | ino_t ino = dir->ino; |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 181 | const char *question = 0; |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 182 | |
| 183 | if (!dirent->inode) { |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 184 | printf("Missing '..' in directory inode %lu.\n", ino); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 185 | question = "Fix"; |
| 186 | } else if ((dirent->name_len != 2) || |
| 187 | strncmp(dirent->name, "..", dirent->name_len)) { |
| 188 | char *name = malloc(dirent->name_len + 1); |
| 189 | if (!name) |
| 190 | fatal_error("Couldn't allocate bad .. name"); |
| 191 | strncpy(name, dirent->name, dirent->name_len); |
| 192 | name[dirent->name_len] = '\0'; |
| 193 | printf("Second entry in directory inode %lu contains '%s' " |
| 194 | "(inode=%u)\n", ino, name, dirent->inode); |
| 195 | printf("instead of '..'.\n"); |
| 196 | free(name); |
| 197 | question = "Change to be '..'"; |
| 198 | } |
| 199 | if (question) { |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 200 | if (dirent->rec_len < 12) |
| 201 | fatal_error("Cannot fix, insufficient space to add '..'"); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 202 | preenhalt(fs); |
| 203 | if (ask(question, 1)) { |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 204 | /* |
| 205 | * Note: we don't have the parent inode just |
| 206 | * yet, so we will fill it in with the root |
| 207 | * inode. This will get fixed in pass 3. |
| 208 | */ |
| 209 | dirent->inode = EXT2_ROOT_INO; |
| 210 | dirent->name_len = 2; |
| 211 | dirent->name[0] = '.'; |
| 212 | dirent->name[1] = '.'; |
| 213 | return 1; |
| 214 | } else |
| 215 | ext2fs_unmark_valid(fs); |
| 216 | return 0; |
| 217 | } |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 218 | dir->dotdot = dirent->inode; |
| 219 | return 0; |
| 220 | } |
| 221 | |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 222 | static char unknown_pathname[] = "???"; |
| 223 | |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 224 | /* |
| 225 | * Check to make sure a directory entry doesn't contain any illegal |
| 226 | * characters. |
| 227 | */ |
| 228 | static int check_name(ext2_filsys fs, |
| 229 | struct ext2_dir_entry *dirent, |
| 230 | ino_t dir_ino, |
| 231 | char *name) |
| 232 | { |
| 233 | int i; |
| 234 | int fixup = -1; |
| 235 | char *pathname; |
| 236 | int ret = 0; |
| 237 | errcode_t retval; |
| 238 | |
| 239 | for ( i = 0; i < dirent->name_len; i++) { |
| 240 | if (dirent->name[i] == '/' || dirent->name[i] == '\0') { |
| 241 | if (fixup < 0) { |
| 242 | retval = ext2fs_get_pathname(fs, dir_ino, |
| 243 | 0, &pathname); |
| 244 | if (retval) { |
| 245 | com_err(program_name, retval, "while getting pathname in check_name"); |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 246 | pathname = unknown_pathname; |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 247 | } |
| 248 | printf ("Bad file name '%s' (contains '/' or " |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 249 | " null) in directory '%s' (%lu)\n", |
| 250 | name, pathname, dir_ino); |
| 251 | if (pathname != unknown_pathname) |
| 252 | free(pathname); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 253 | preenhalt(fs); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 254 | fixup = ask("Replace '/' or null by '.'", 1); |
| 255 | } |
| 256 | if (fixup) { |
| 257 | dirent->name[i] = '.'; |
| 258 | ret = 1; |
| 259 | } else |
| 260 | ext2fs_unmark_valid(fs); |
| 261 | } |
| 262 | } |
| 263 | return ret; |
| 264 | } |
| 265 | |
| 266 | static int check_dir_block(ext2_filsys fs, |
| 267 | struct dir_block_struct *db, |
| 268 | char *buf) |
| 269 | { |
| 270 | struct dir_info *subdir, *dir; |
| 271 | struct ext2_dir_entry *dirent; |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 272 | int offset = 0; |
| 273 | int dir_modified = 0; |
| 274 | errcode_t retval; |
| 275 | char *path1, *path2; |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 276 | int dot_state, name_len; |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 277 | blk_t block_nr = db->blk; |
| 278 | ino_t ino = db->ino; |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 279 | char name[EXT2_NAME_LEN+1]; |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 280 | |
| 281 | /* |
| 282 | * Make sure the inode is still in use (could have been |
| 283 | * deleted in the duplicate/bad blocks pass. |
| 284 | */ |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 285 | if (!(ext2fs_test_inode_bitmap(inode_used_map, ino))) |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 286 | return 0; |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 287 | |
| 288 | if (db->blk == 0) { |
| 289 | if (allocate_dir_block(fs, db, buf)) |
| 290 | return 0; |
| 291 | block_nr = db->blk; |
| 292 | } |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 293 | |
| 294 | if (db->blockcnt) |
| 295 | dot_state = 2; |
| 296 | else |
| 297 | dot_state = 0; |
| 298 | |
| 299 | #if 0 |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 300 | printf("In process_dir_block block %lu, #%d, inode %lu\n", block_nr, |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 301 | db->blockcnt, ino); |
| 302 | #endif |
| 303 | |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 304 | retval = ext2fs_read_dir_block(fs, block_nr, buf); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 305 | if (retval) { |
| 306 | com_err(program_name, retval, |
| 307 | "while reading directory block %d", block_nr); |
| 308 | } |
| 309 | |
| 310 | do { |
| 311 | dot_state++; |
| 312 | dirent = (struct ext2_dir_entry *) (buf + offset); |
| 313 | if (((offset + dirent->rec_len) > fs->blocksize) || |
| 314 | (dirent->rec_len < 8) || |
| 315 | ((dirent->name_len+8) > dirent->rec_len)) { |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 316 | printf("Directory inode %lu, block %d, offset %d: directory corrupted\n", |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 317 | ino, db->blockcnt, offset); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 318 | preenhalt(fs); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 319 | if (ask("Salvage", 1)) { |
| 320 | dirent->rec_len = fs->blocksize - offset; |
| 321 | dirent->name_len = 0; |
| 322 | dirent->inode = 0; |
| 323 | dir_modified++; |
| 324 | } else { |
| 325 | ext2fs_unmark_valid(fs); |
| 326 | return DIRENT_ABORT; |
| 327 | } |
| 328 | } |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 329 | |
| 330 | name_len = dirent->name_len; |
| 331 | if (dirent->name_len > EXT2_NAME_LEN) { |
| 332 | printf("Directory inode %lu, block %d, offset %d: filename too long\n", |
| 333 | ino, db->blockcnt, offset); |
| 334 | preenhalt(fs); |
| 335 | if (ask("Truncate filename", 1)) { |
| 336 | dirent->name_len = EXT2_NAME_LEN; |
| 337 | dir_modified++; |
| 338 | } |
| 339 | name_len = EXT2_NAME_LEN; |
| 340 | } |
| 341 | |
| 342 | strncpy(name, dirent->name, name_len); |
| 343 | name[name_len] = '\0'; |
| 344 | |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 345 | if (dot_state == 1) { |
| 346 | if (check_dot(fs, dirent, ino)) |
| 347 | dir_modified++; |
| 348 | } else if (dot_state == 2) { |
| 349 | dir = get_dir_info(ino); |
| 350 | if (!dir) { |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 351 | printf("Internal error: couldn't find dir_info for %lu\n", |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 352 | ino); |
| 353 | fatal_error(0); |
| 354 | } |
| 355 | if (check_dotdot(fs, dirent, dir)) |
| 356 | dir_modified++; |
| 357 | } else if (dirent->inode == ino) { |
| 358 | retval = ext2fs_get_pathname(fs, ino, 0, &path1); |
| 359 | if (retval) |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 360 | path1 = unknown_pathname; |
| 361 | printf("Entry '%s' in %s (%lu) is a link to '.' ", |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 362 | name, path1, ino); |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 363 | if (path1 != unknown_pathname) |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 364 | free(path1); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 365 | preenhalt(fs); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 366 | if (ask("Clear", 1)) { |
| 367 | dirent->inode = 0; |
| 368 | dir_modified++; |
| 369 | } |
| 370 | } |
| 371 | if (!dirent->inode) |
| 372 | goto next; |
| 373 | |
| 374 | #if 0 |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 375 | printf("Entry '%s', name_len %d, rec_len %d, inode %lu... ", |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 376 | name, dirent->name_len, dirent->rec_len, dirent->inode); |
| 377 | #endif |
| 378 | if (check_name(fs, dirent, ino, name)) |
| 379 | dir_modified++; |
| 380 | |
| 381 | /* |
| 382 | * Make sure the inode listed is a legal one. |
| 383 | */ |
| 384 | if (((dirent->inode != EXT2_ROOT_INO) && |
| 385 | (dirent->inode < EXT2_FIRST_INO)) || |
| 386 | (dirent->inode > fs->super->s_inodes_count)) { |
| 387 | retval = ext2fs_get_pathname(fs, ino, 0, &path1); |
| 388 | if (retval) |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 389 | path1 = unknown_pathname; |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 390 | printf("Entry '%s' in %s (%lu) has bad inode #: %u.\n", |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 391 | name, path1, ino, dirent->inode); |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 392 | if (path1 != unknown_pathname) |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 393 | free(path1); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 394 | preenhalt(fs); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 395 | if (ask("Clear", 1)) { |
| 396 | dirent->inode = 0; |
| 397 | dir_modified++; |
| 398 | goto next; |
| 399 | } else |
| 400 | ext2fs_unmark_valid(fs); |
| 401 | } |
| 402 | |
| 403 | /* |
| 404 | * If the inode is unusued, offer to clear it. |
| 405 | */ |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 406 | if (!(ext2fs_test_inode_bitmap(inode_used_map, |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 407 | dirent->inode))) { |
| 408 | retval = ext2fs_get_pathname(fs, ino, 0, &path1); |
| 409 | if (retval) |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 410 | path1 = unknown_pathname; |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 411 | printf("Entry '%s' in %s (%lu) has deleted/unused inode %u.\n", |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 412 | name, path1, ino, dirent->inode); |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 413 | if (path1 != unknown_pathname) |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 414 | free(path1); |
| 415 | if (ask("Clear", 1)) { |
| 416 | dirent->inode = 0; |
| 417 | dir_modified++; |
| 418 | goto next; |
| 419 | } else |
| 420 | ext2fs_unmark_valid(fs); |
| 421 | } |
| 422 | |
| 423 | /* |
| 424 | * If the inode was marked as having bad fields in |
| 425 | * pass1, process it and offer to fix/clear it. |
| 426 | * (We wait until now so that we can display the |
| 427 | * pathname to the user.) |
| 428 | */ |
| 429 | if (inode_bad_map && |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 430 | ext2fs_test_inode_bitmap(inode_bad_map, |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 431 | dirent->inode)) { |
| 432 | if (process_bad_inode(fs, ino, dirent->inode)) { |
| 433 | dirent->inode = 0; |
| 434 | dir_modified++; |
| 435 | goto next; |
| 436 | } |
| 437 | } |
| 438 | |
| 439 | /* |
| 440 | * If this is a directory, then mark its parent in its |
| 441 | * dir_info structure. If the parent field is already |
| 442 | * filled in, then this directory has more than one |
| 443 | * hard link. We assume the first link is correct, |
| 444 | * and ask the user if he/she wants to clear this one. |
| 445 | */ |
| 446 | if ((dot_state > 2) && |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 447 | (ext2fs_test_inode_bitmap(inode_dir_map, |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 448 | dirent->inode))) { |
| 449 | subdir = get_dir_info(dirent->inode); |
| 450 | if (!subdir) { |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 451 | printf("INTERNAL ERROR: missing dir %u\n", |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 452 | dirent->inode); |
| 453 | fatal_error(0); |
| 454 | } |
| 455 | if (subdir->parent) { |
| 456 | retval = ext2fs_get_pathname(fs, ino, |
| 457 | 0, &path1); |
| 458 | if (retval) |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 459 | path1 = unknown_pathname; |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 460 | retval = ext2fs_get_pathname(fs, |
| 461 | subdir->parent, |
| 462 | dirent->inode, |
| 463 | &path2); |
| 464 | if (retval) |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 465 | path2 = unknown_pathname; |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 466 | printf("Entry '%s' in %s (%lu) is a link to directory %s (%u).\n", |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 467 | name, path1, ino, path2, |
| 468 | dirent->inode); |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 469 | if (path1 != unknown_pathname) |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 470 | free(path1); |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 471 | if (path2 != unknown_pathname) |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 472 | free(path2); |
| 473 | if (ask("Clear", 1)) { |
| 474 | dirent->inode = 0; |
| 475 | dir_modified++; |
| 476 | goto next; |
| 477 | } else |
| 478 | ext2fs_unmark_valid(fs); |
| 479 | } |
| 480 | subdir->parent = ino; |
| 481 | } |
| 482 | |
| 483 | if (inode_count[dirent->inode]++ > 0) |
| 484 | fs_links_count++; |
| 485 | fs_total_count++; |
| 486 | next: |
| 487 | offset += dirent->rec_len; |
| 488 | } while (offset < fs->blocksize); |
| 489 | #if 0 |
| 490 | printf("\n"); |
| 491 | #endif |
| 492 | if (offset != fs->blocksize) { |
| 493 | printf("Final rec_len is %d, should be %d\n", |
| 494 | dirent->rec_len, |
| 495 | dirent->rec_len - fs->blocksize + offset); |
| 496 | } |
| 497 | if (dir_modified) { |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 498 | retval = ext2fs_write_dir_block(fs, block_nr, buf); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 499 | if (retval) { |
| 500 | com_err(program_name, retval, |
| 501 | "while writing directory block %d", block_nr); |
| 502 | } |
| 503 | ext2fs_mark_changed(fs); |
| 504 | } |
| 505 | return 0; |
| 506 | } |
| 507 | |
| 508 | /* |
| 509 | * This function is called to deallocate a block, and is an interator |
| 510 | * functioned called by deallocate inode via ext2fs_iterate_block(). |
| 511 | */ |
| 512 | static int deallocate_inode_block(ext2_filsys fs, |
| 513 | blk_t *block_nr, |
| 514 | int blockcnt, |
| 515 | void *private) |
| 516 | { |
| 517 | if (!*block_nr) |
| 518 | return 0; |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 519 | ext2fs_unmark_block_bitmap(block_found_map, *block_nr); |
| 520 | ext2fs_unmark_block_bitmap(fs->block_map, *block_nr); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 521 | return 0; |
| 522 | } |
| 523 | |
| 524 | /* |
| 525 | * This fuction deallocates an inode |
| 526 | */ |
| 527 | static void deallocate_inode(ext2_filsys fs, ino_t ino, |
| 528 | char* block_buf) |
| 529 | { |
| 530 | errcode_t retval; |
| 531 | struct ext2_inode inode; |
| 532 | |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 533 | e2fsck_read_inode(fs, ino, &inode, "deallocate_inode"); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 534 | inode.i_links_count = 0; |
| 535 | inode.i_dtime = time(0); |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 536 | e2fsck_write_inode(fs, ino, &inode, "deallocate_inode"); |
| 537 | |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 538 | /* |
| 539 | * Fix up the bitmaps... |
| 540 | */ |
| 541 | read_bitmaps(fs); |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 542 | ext2fs_unmark_inode_bitmap(inode_used_map, ino); |
| 543 | ext2fs_unmark_inode_bitmap(inode_dir_map, ino); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 544 | if (inode_bad_map) |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 545 | ext2fs_unmark_inode_bitmap(inode_bad_map, ino); |
| 546 | ext2fs_unmark_inode_bitmap(fs->inode_map, ino); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 547 | ext2fs_mark_ib_dirty(fs); |
| 548 | |
| 549 | if (!inode_has_valid_blocks(&inode)) |
| 550 | return; |
| 551 | |
| 552 | ext2fs_mark_bb_dirty(fs); |
| 553 | retval = ext2fs_block_iterate(fs, ino, 0, block_buf, |
| 554 | deallocate_inode_block, 0); |
| 555 | if (retval) |
| 556 | com_err("deallocate_inode", retval, |
| 557 | "while calling ext2fs_block_iterate for inode %d", |
| 558 | ino); |
| 559 | } |
| 560 | |
| 561 | /* |
| 562 | * These two subroutines are used by process_bad_inode; it is used to |
| 563 | * make sure that certain reserved fields are really zero. If not, |
| 564 | * prompt the user if he/she wants us to zeroize them. |
| 565 | */ |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 566 | static void check_for_zero_u32(ext2_filsys fs, ino_t ino, char *pathname, |
| 567 | const char *name, __u32 *val, |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 568 | int *modified) |
| 569 | { |
| 570 | char prompt[80]; |
| 571 | |
| 572 | if (*val) { |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 573 | printf("%s for inode %lu (%s) is %u, should be zero.\n", |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 574 | name, ino, pathname, *val); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 575 | preenhalt(fs); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 576 | sprintf(prompt, "Clear %s", name); |
| 577 | if (ask(prompt, 1)) { |
| 578 | *val = 0; |
| 579 | *modified = 1; |
| 580 | } else |
| 581 | ext2fs_unmark_valid(fs); |
| 582 | } |
| 583 | } |
| 584 | |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 585 | static void check_for_zero_u8(ext2_filsys fs, ino_t ino, char *pathname, |
| 586 | const char *name, __u8 *val, |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 587 | int *modified) |
| 588 | { |
| 589 | char prompt[80]; |
| 590 | |
| 591 | if (*val) { |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 592 | printf("%s for inode %lu (%s) is %d, should be zero.\n", |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 593 | name, ino, pathname, *val); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 594 | preenhalt(fs); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 595 | sprintf(prompt, "Clear %s", name); |
| 596 | if (ask(prompt, 1)) { |
| 597 | *val = 0; |
| 598 | *modified = 1; |
| 599 | } else |
| 600 | ext2fs_unmark_valid(fs); |
| 601 | } |
| 602 | } |
| 603 | |
| 604 | |
| 605 | |
| 606 | static int process_bad_inode(ext2_filsys fs, ino_t dir, ino_t ino) |
| 607 | { |
| 608 | struct ext2_inode inode; |
| 609 | errcode_t retval; |
| 610 | int inode_modified = 0; |
| 611 | char *pathname; |
| 612 | |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 613 | e2fsck_read_inode(fs, ino, &inode, "process_bad_inode"); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 614 | retval = ext2fs_get_pathname(fs, dir, ino, &pathname); |
| 615 | if (retval) { |
| 616 | com_err("process_bad_inode", retval, |
| 617 | "while getting pathname for inode %d", |
| 618 | ino); |
| 619 | return 0; |
| 620 | } |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 621 | if (!LINUX_S_ISDIR(inode.i_mode) && !LINUX_S_ISREG(inode.i_mode) && |
| 622 | !LINUX_S_ISCHR(inode.i_mode) && !LINUX_S_ISBLK(inode.i_mode) && |
| 623 | !LINUX_S_ISLNK(inode.i_mode) && !LINUX_S_ISFIFO(inode.i_mode) && |
| 624 | !(LINUX_S_ISSOCK(inode.i_mode))) { |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 625 | printf("Inode %lu (%s) has a bad mode (0%o).\n", |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 626 | ino, pathname, inode.i_mode); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 627 | preenhalt(fs); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 628 | if (ask("Clear", 1)) { |
| 629 | deallocate_inode(fs, ino, 0); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 630 | free(pathname); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 631 | return 1; |
| 632 | } else |
| 633 | ext2fs_unmark_valid(fs); |
| 634 | } |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 635 | check_for_zero_u32(fs, ino, pathname, "i_faddr", &inode.i_faddr, |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 636 | &inode_modified); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 637 | #if HAVE_EXT2_FRAGS |
| 638 | check_for_zero_u8(fs, ino, pathname, "i_frag", &inode.i_frag, |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 639 | &inode_modified); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 640 | check_for_zero_u8(fs, ino, pathname, "i_fsize", &inode.i_fsize, |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 641 | &inode_modified); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 642 | #else |
| 643 | /* |
| 644 | * Even if the OS specific fields don't support i_frag and |
| 645 | * i_fsize, make sure they are set to zero anyway. This may |
| 646 | * cause problems if on some other OS these fields are reused |
| 647 | * for something else, but that's probably a bad idea.... |
| 648 | */ |
| 649 | check_for_zero_u8(fs, ino, pathname, "i_frag", |
| 650 | &inode.osd2.linux2.l_i_frag, &inode_modified); |
| 651 | check_for_zero_u8(fs, ino, pathname, "i_fsize", |
| 652 | &inode.osd2.linux2.l_i_fsize, &inode_modified); |
| 653 | #endif |
| 654 | check_for_zero_u32(fs, ino, pathname, "i_file_acl", &inode.i_file_acl, |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 655 | &inode_modified); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 656 | check_for_zero_u32(fs, ino, pathname, "i_dir_acl", &inode.i_dir_acl, |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 657 | &inode_modified); |
| 658 | free(pathname); |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 659 | if (inode_modified) |
| 660 | e2fsck_write_inode(fs, ino, &inode, "process_bad_inode"); |
Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 661 | return 0; |
| 662 | } |
| 663 | |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 664 | |
| 665 | /* |
| 666 | * allocate_dir_block --- this function allocates a new directory |
| 667 | * block for a particular inode; this is done if a directory has |
| 668 | * a "hole" in it, or if a directory has a illegal block number |
| 669 | * that was zeroed out and now needs to be replaced. |
| 670 | */ |
| 671 | static int allocate_dir_block(ext2_filsys fs, |
| 672 | struct dir_block_struct *db, |
| 673 | char *buf) |
| 674 | { |
| 675 | blk_t blk; |
| 676 | char *block; |
| 677 | struct ext2_inode inode; |
| 678 | errcode_t retval; |
| 679 | |
| 680 | printf("Directory inode %lu has a hole at block #%d\n", |
| 681 | db->ino, db->blockcnt); |
| 682 | if (ask("Allocate block", 1) == 0) |
| 683 | return 1; |
| 684 | |
| 685 | /* |
| 686 | * Read the inode and block bitmaps in; we'll be messing with |
| 687 | * them. |
| 688 | */ |
| 689 | read_bitmaps(fs); |
| 690 | |
| 691 | /* |
| 692 | * First, find a free block |
| 693 | */ |
| 694 | retval = ext2fs_new_block(fs, 0, block_found_map, &blk); |
| 695 | if (retval) { |
| 696 | com_err("allocate_dir_block", retval, |
| 697 | "while trying to fill a hole in a directory inode"); |
| 698 | return 1; |
| 699 | } |
| 700 | ext2fs_mark_block_bitmap(block_found_map, blk); |
| 701 | ext2fs_mark_block_bitmap(fs->block_map, blk); |
| 702 | ext2fs_mark_bb_dirty(fs); |
| 703 | |
| 704 | /* |
| 705 | * Now let's create the actual data block for the inode |
| 706 | */ |
| 707 | if (db->blockcnt) |
| 708 | retval = ext2fs_new_dir_block(fs, 0, 0, &block); |
| 709 | else |
| 710 | retval = ext2fs_new_dir_block(fs, db->ino, EXT2_ROOT_INO, |
| 711 | &block); |
| 712 | |
| 713 | if (retval) { |
| 714 | com_err("allocate_dir_block", retval, |
| 715 | "while creating new directory block"); |
| 716 | return 1; |
| 717 | } |
| 718 | |
| 719 | retval = ext2fs_write_dir_block(fs, blk, block); |
| 720 | free(block); |
| 721 | if (retval) { |
| 722 | com_err("allocate_dir_block", retval, |
| 723 | "while writing an empty directory block"); |
| 724 | return 1; |
| 725 | } |
| 726 | |
| 727 | /* |
| 728 | * Update the inode block count |
| 729 | */ |
| 730 | e2fsck_read_inode(fs, db->ino, &inode, "allocate_dir_block"); |
| 731 | inode.i_blocks += fs->blocksize / 512; |
| 732 | if (inode.i_size < (db->blockcnt+1) * fs->blocksize) |
| 733 | inode.i_size = (db->blockcnt+1) * fs->blocksize; |
| 734 | e2fsck_write_inode(fs, db->ino, &inode, "allocate_dir_block"); |
| 735 | |
| 736 | /* |
| 737 | * Finally, update the block pointers for the inode |
| 738 | */ |
| 739 | db->blk = blk; |
| 740 | retval = ext2fs_block_iterate(fs, db->ino, BLOCK_FLAG_HOLE, |
| 741 | 0, update_dir_block, db); |
| 742 | if (retval) { |
| 743 | com_err("allocate_dir_block", retval, |
| 744 | "while calling ext2fs_block_iterate"); |
| 745 | return 1; |
| 746 | } |
| 747 | |
| 748 | return 0; |
| 749 | } |
| 750 | |
| 751 | /* |
| 752 | * This is a helper function for allocate_dir_block(). |
| 753 | */ |
| 754 | static int update_dir_block(ext2_filsys fs, |
| 755 | blk_t *block_nr, |
| 756 | int blockcnt, |
| 757 | void *private) |
| 758 | { |
| 759 | struct dir_block_struct *db = private; |
| 760 | |
| 761 | if (db->blockcnt == blockcnt) { |
| 762 | *block_nr = db->blk; |
| 763 | return BLOCK_CHANGED; |
| 764 | } |
| 765 | return 0; |
| 766 | } |
| 767 | |