1 /* 2 * set_fields.c --- set a superblock value 3 * 4 * Copyright (C) 2000, 2001, 2002, 2003, 2004 by Theodore Ts'o. 5 * 6 * %Begin-Header% 7 * This file may be redistributed under the terms of the GNU Public 8 * License. 9 * %End-Header% 10 */ 11 12 #define _XOPEN_SOURCE 600 /* for inclusion of strptime() and strtoull */ 13 14 #ifdef HAVE_STRTOULL 15 #define STRTOULL strtoull 16 #else 17 #define STRTOULL strtoul 18 #endif 19 20 #include <stdio.h> 21 #include <unistd.h> 22 #include <stdlib.h> 23 #include <ctype.h> 24 #include <string.h> 25 #include <strings.h> 26 #include <time.h> 27 #include <sys/types.h> 28 #include <sys/stat.h> 29 #ifdef HAVE_ERRNO_H 30 #include <errno.h> 31 #endif 32 #if HAVE_STRINGS_H 33 #include <strings.h> 34 #endif 35 #include <fcntl.h> 36 #include <utime.h> 37 38 #include "debugfs.h" 39 #include "uuid/uuid.h" 40 #include "e2p/e2p.h" 41 42 static struct ext2_super_block set_sb; 43 static struct ext2_inode set_inode; 44 static struct ext2_group_desc set_gd; 45 static dgrp_t set_bg; 46 static ext2_ino_t set_ino; 47 static int array_idx; 48 49 #define FLAG_ARRAY 0x0001 50 51 struct field_set_info { 52 const char *name; 53 void *ptr; 54 unsigned int size; 55 errcode_t (*func)(struct field_set_info *info, char *arg); 56 int flags; 57 int max_idx; 58 }; 59 60 static errcode_t parse_uint(struct field_set_info *info, char *arg); 61 static errcode_t parse_int(struct field_set_info *info, char *arg); 62 static errcode_t parse_string(struct field_set_info *info, char *arg); 63 static errcode_t parse_uuid(struct field_set_info *info, char *arg); 64 static errcode_t parse_hashalg(struct field_set_info *info, char *arg); 65 static errcode_t parse_time(struct field_set_info *info, char *arg); 66 static errcode_t parse_bmap(struct field_set_info *info, char *arg); 67 static errcode_t parse_gd_csum(struct field_set_info *info, char *arg); 68 69 static struct field_set_info super_fields[] = { 70 { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint }, 71 { "blocks_count", &set_sb.s_blocks_count, 4, parse_uint }, 72 { "r_blocks_count", &set_sb.s_r_blocks_count, 4, parse_uint }, 73 { "free_blocks_count", &set_sb.s_free_blocks_count, 4, parse_uint }, 74 { "free_inodes_count", &set_sb.s_free_inodes_count, 4, parse_uint }, 75 { "first_data_block", &set_sb.s_first_data_block, 4, parse_uint }, 76 { "log_block_size", &set_sb.s_log_block_size, 4, parse_uint }, 77 { "log_frag_size", &set_sb.s_log_frag_size, 4, parse_int }, 78 { "blocks_per_group", &set_sb.s_blocks_per_group, 4, parse_uint }, 79 { "frags_per_group", &set_sb.s_frags_per_group, 4, parse_uint }, 80 { "inodes_per_group", &set_sb.s_inodes_per_group, 4, parse_uint }, 81 { "mtime", &set_sb.s_mtime, 4, parse_time }, 82 { "wtime", &set_sb.s_wtime, 4, parse_time }, 83 { "mnt_count", &set_sb.s_mnt_count, 2, parse_uint }, 84 { "max_mnt_count", &set_sb.s_max_mnt_count, 2, parse_int }, 85 /* s_magic */ 86 { "state", &set_sb.s_state, 2, parse_uint }, 87 { "errors", &set_sb.s_errors, 2, parse_uint }, 88 { "minor_rev_level", &set_sb.s_minor_rev_level, 2, parse_uint }, 89 { "lastcheck", &set_sb.s_lastcheck, 4, parse_time }, 90 { "checkinterval", &set_sb.s_checkinterval, 4, parse_uint }, 91 { "creator_os", &set_sb.s_creator_os, 4, parse_uint }, 92 { "rev_level", &set_sb.s_rev_level, 4, parse_uint }, 93 { "def_resuid", &set_sb.s_def_resuid, 2, parse_uint }, 94 { "def_resgid", &set_sb.s_def_resgid, 2, parse_uint }, 95 { "first_ino", &set_sb.s_first_ino, 4, parse_uint }, 96 { "inode_size", &set_sb.s_inode_size, 2, parse_uint }, 97 { "block_group_nr", &set_sb.s_block_group_nr, 2, parse_uint }, 98 { "feature_compat", &set_sb.s_feature_compat, 4, parse_uint }, 99 { "feature_incompat", &set_sb.s_feature_incompat, 4, parse_uint }, 100 { "feature_ro_compat", &set_sb.s_feature_ro_compat, 4, parse_uint }, 101 { "uuid", &set_sb.s_uuid, 16, parse_uuid }, 102 { "volume_name", &set_sb.s_volume_name, 16, parse_string }, 103 { "last_mounted", &set_sb.s_last_mounted, 64, parse_string }, 104 { "lastcheck", &set_sb.s_lastcheck, 4, parse_uint }, 105 { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, 106 4, parse_uint }, 107 { "prealloc_blocks", &set_sb.s_prealloc_blocks, 1, parse_uint }, 108 { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, 1, 109 parse_uint }, 110 { "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, 2, 111 parse_uint }, 112 { "journal_uuid", &set_sb.s_journal_uuid, 16, parse_uuid }, 113 { "journal_inum", &set_sb.s_journal_inum, 4, parse_uint }, 114 { "journal_dev", &set_sb.s_journal_dev, 4, parse_uint }, 115 { "last_orphan", &set_sb.s_last_orphan, 4, parse_uint }, 116 { "hash_seed", &set_sb.s_hash_seed, 16, parse_uuid }, 117 { "def_hash_version", &set_sb.s_def_hash_version, 1, parse_hashalg }, 118 { "jnl_backup_type", &set_sb.s_jnl_backup_type, 1, parse_uint }, 119 { "desc_size", &set_sb.s_desc_size, 2, parse_uint }, 120 { "default_mount_opts", &set_sb.s_default_mount_opts, 4, parse_uint }, 121 { "first_meta_bg", &set_sb.s_first_meta_bg, 4, parse_uint }, 122 { "mkfs_time", &set_sb.s_mkfs_time, 4, parse_time }, 123 { "jnl_blocks", &set_sb.s_jnl_blocks[0], 4, parse_uint, FLAG_ARRAY, 124 17 }, 125 { "blocks_count_hi", &set_sb.s_blocks_count_hi, 4, parse_uint }, 126 { "r_blocks_count_hi", &set_sb.s_r_blocks_count_hi, 4, parse_uint }, 127 { "min_extra_isize", &set_sb.s_min_extra_isize, 2, parse_uint }, 128 { "want_extra_isize", &set_sb.s_want_extra_isize, 2, parse_uint }, 129 { "flags", &set_sb.s_flags, 4, parse_uint }, 130 { "raid_stride", &set_sb.s_raid_stride, 2, parse_uint }, 131 { "min_extra_isize", &set_sb.s_min_extra_isize, 4, parse_uint }, 132 { "mmp_interval", &set_sb.s_mmp_interval, 2, parse_uint }, 133 { "mmp_block", &set_sb.s_mmp_block, 8, parse_uint }, 134 { "raid_stripe_width", &set_sb.s_raid_stripe_width, 4, parse_uint }, 135 { "log_groups_per_flex", &set_sb.s_log_groups_per_flex, 1, parse_uint }, 136 { "kbytes_written", &set_sb.s_kbytes_written, 8, parse_uint }, 137 { 0, 0, 0, 0 } 138 }; 139 140 static struct field_set_info inode_fields[] = { 141 { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint }, 142 { "mode", &set_inode.i_mode, 2, parse_uint }, 143 { "uid", &set_inode.i_uid, 2, parse_uint }, 144 { "size", &set_inode.i_size, 4, parse_uint }, 145 { "atime", &set_inode.i_atime, 4, parse_time }, 146 { "ctime", &set_inode.i_ctime, 4, parse_time }, 147 { "mtime", &set_inode.i_mtime, 4, parse_time }, 148 { "dtime", &set_inode.i_dtime, 4, parse_time }, 149 { "gid", &set_inode.i_gid, 2, parse_uint }, 150 { "links_count", &set_inode.i_links_count, 2, parse_uint }, 151 { "blocks", &set_inode.i_blocks, 4, parse_uint }, 152 { "flags", &set_inode.i_flags, 4, parse_uint }, 153 { "version", &set_inode.osd1.linux1.l_i_version, 4, parse_uint }, 154 { "translator", &set_inode.osd1.hurd1.h_i_translator, 4, parse_uint }, 155 { "block", &set_inode.i_block[0], 4, parse_uint, FLAG_ARRAY, 156 EXT2_NDIR_BLOCKS }, 157 { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], 4, parse_uint }, 158 { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], 4, parse_uint }, 159 { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], 4, parse_uint }, 160 { "generation", &set_inode.i_generation, 4, parse_uint }, 161 { "file_acl", &set_inode.i_file_acl, 4, parse_uint }, 162 { "file_acl_high", &set_inode.osd2.linux2.l_i_file_acl_high, 2, 163 parse_uint }, 164 { "dir_acl", &set_inode.i_dir_acl, 4, parse_uint }, 165 { "size_high", &set_inode.i_size_high, 4, parse_uint }, 166 { "faddr", &set_inode.i_faddr, 4, parse_uint }, 167 { "blocks_hi", &set_inode.osd2.linux2.l_i_blocks_hi, 2, parse_uint }, 168 { "frag", &set_inode.osd2.hurd2.h_i_frag, 1, parse_uint }, 169 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, 1, parse_uint }, 170 { "uid_high", &set_inode.osd2.linux2.l_i_uid_high, 2, parse_uint }, 171 { "gid_high", &set_inode.osd2.linux2.l_i_gid_high, 2, parse_uint }, 172 { "author", &set_inode.osd2.hurd2.h_i_author, 4, parse_uint }, 173 { "bmap", NULL, 4, parse_bmap, FLAG_ARRAY }, 174 { 0, 0, 0, 0 } 175 }; 176 177 static struct field_set_info ext2_bg_fields[] = { 178 { "block_bitmap", &set_gd.bg_block_bitmap, 4, parse_uint }, 179 { "inode_bitmap", &set_gd.bg_inode_bitmap, 4, parse_uint }, 180 { "inode_table", &set_gd.bg_inode_table, 4, parse_uint }, 181 { "free_blocks_count", &set_gd.bg_free_blocks_count, 2, parse_uint }, 182 { "free_inodes_count", &set_gd.bg_free_inodes_count, 2, parse_uint }, 183 { "used_dirs_count", &set_gd.bg_used_dirs_count, 2, parse_uint }, 184 { "flags", &set_gd.bg_flags, 2, parse_uint }, 185 { "reserved", &set_gd.bg_reserved, 2, parse_uint, FLAG_ARRAY, 2 }, 186 { "itable_unused", &set_gd.bg_itable_unused, 2, parse_uint }, 187 { "checksum", &set_gd.bg_checksum, 2, parse_gd_csum }, 188 { 0, 0, 0, 0 } 189 }; 190 191 192 static struct field_set_info *find_field(struct field_set_info *fields, 193 char *field) 194 { 195 struct field_set_info *ss; 196 const char *prefix; 197 char *arg, *delim, *idx, *tmp; 198 int prefix_len; 199 200 if (fields == super_fields) 201 prefix = "s_"; 202 else if (fields == inode_fields) 203 prefix = "i_"; 204 else 205 prefix = "bg_"; 206 prefix_len = strlen(prefix); 207 if (strncmp(field, prefix, prefix_len) == 0) 208 field += prefix_len; 209 210 arg = malloc(strlen(field)+1); 211 if (!arg) 212 return NULL; 213 strcpy(arg, field); 214 215 idx = strchr(arg, '['); 216 if (idx) { 217 *idx++ = 0; 218 delim = idx + strlen(idx) - 1; 219 if (!*idx || *delim != ']') 220 idx = 0; 221 else 222 *delim = 0; 223 } 224 /* 225 * Can we parse the number? 226 */ 227 if (idx) { 228 array_idx = strtol(idx, &tmp, 0); 229 if (*tmp) 230 idx = 0; 231 } 232 233 for (ss = fields ; ss->name ; ss++) { 234 if (ss->flags & FLAG_ARRAY) { 235 if (!idx || (strcmp(ss->name, arg) != 0)) 236 continue; 237 if (ss->max_idx > 0 && array_idx >= ss->max_idx) 238 continue; 239 } else { 240 if (strcmp(ss->name, field) != 0) 241 continue; 242 } 243 free(arg); 244 return ss; 245 } 246 free(arg); 247 return NULL; 248 } 249 250 static errcode_t parse_uint(struct field_set_info *info, char *arg) 251 { 252 unsigned long long num, limit; 253 char *tmp; 254 union { 255 __u64 *ptr64; 256 __u32 *ptr32; 257 __u16 *ptr16; 258 __u8 *ptr8; 259 } u; 260 261 u.ptr8 = (__u8 *) info->ptr; 262 if (info->flags & FLAG_ARRAY) 263 u.ptr8 += array_idx * info->size; 264 265 errno = 0; 266 num = STRTOULL(arg, &tmp, 0); 267 if (*tmp || errno) { 268 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 269 arg, info->name); 270 return EINVAL; 271 } 272 limit = ~0ULL >> ((8 - info->size) * 8); 273 if (num > limit) { 274 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n", 275 arg, info->name, limit); 276 return EINVAL; 277 } 278 switch (info->size) { 279 case 8: 280 *u.ptr64 = num; 281 break; 282 case 4: 283 *u.ptr32 = num; 284 break; 285 case 2: 286 *u.ptr16 = num; 287 break; 288 case 1: 289 *u.ptr8 = num; 290 break; 291 } 292 return 0; 293 } 294 295 static errcode_t parse_int(struct field_set_info *info, char *arg) 296 { 297 long num; 298 char *tmp; 299 __s32 *ptr32; 300 __s16 *ptr16; 301 __s8 *ptr8; 302 303 num = strtol(arg, &tmp, 0); 304 if (*tmp) { 305 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 306 arg, info->name); 307 return EINVAL; 308 } 309 switch (info->size) { 310 case 4: 311 ptr32 = (__s32 *) info->ptr; 312 *ptr32 = num; 313 break; 314 case 2: 315 ptr16 = (__s16 *) info->ptr; 316 *ptr16 = num; 317 break; 318 case 1: 319 ptr8 = (__s8 *) info->ptr; 320 *ptr8 = num; 321 break; 322 } 323 return 0; 324 } 325 326 static errcode_t parse_string(struct field_set_info *info, char *arg) 327 { 328 char *cp = (char *) info->ptr; 329 330 if (strlen(arg) >= info->size) { 331 fprintf(stderr, "Error maximum size for %s is %d.\n", 332 info->name, info->size); 333 return EINVAL; 334 } 335 strcpy(cp, arg); 336 return 0; 337 } 338 339 static errcode_t parse_time(struct field_set_info *info, char *arg) 340 { 341 time_t t; 342 __u32 *ptr32; 343 344 ptr32 = (__u32 *) info->ptr; 345 346 t = string_to_time(arg); 347 348 if (t == ((time_t) -1)) { 349 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 350 arg, info->name); 351 return EINVAL; 352 } 353 *ptr32 = t; 354 return 0; 355 } 356 357 static errcode_t parse_uuid(struct field_set_info *info, char *arg) 358 { 359 unsigned char * p = (unsigned char *) info->ptr; 360 361 if ((strcasecmp(arg, "null") == 0) || 362 (strcasecmp(arg, "clear") == 0)) { 363 uuid_clear(p); 364 } else if (strcasecmp(arg, "time") == 0) { 365 uuid_generate_time(p); 366 } else if (strcasecmp(arg, "random") == 0) { 367 uuid_generate(p); 368 } else if (uuid_parse(arg, p)) { 369 fprintf(stderr, "Invalid UUID format: %s\n", arg); 370 return EINVAL; 371 } 372 return 0; 373 } 374 375 static errcode_t parse_hashalg(struct field_set_info *info, char *arg) 376 { 377 int hashv; 378 unsigned char *p = (unsigned char *) info->ptr; 379 380 hashv = e2p_string2hash(arg); 381 if (hashv < 0) { 382 fprintf(stderr, "Invalid hash algorithm: %s\n", arg); 383 return EINVAL; 384 } 385 *p = hashv; 386 return 0; 387 } 388 389 static errcode_t parse_bmap(struct field_set_info *info, char *arg) 390 { 391 unsigned long num; 392 blk_t blk; 393 errcode_t retval; 394 char *tmp; 395 396 num = strtoul(arg, &tmp, 0); 397 if (*tmp) { 398 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 399 arg, info->name); 400 return EINVAL; 401 } 402 blk = num; 403 404 retval = ext2fs_bmap(current_fs, set_ino, &set_inode, 0, BMAP_SET, 405 array_idx, &blk); 406 if (retval) { 407 com_err("set_inode", retval, "while setting block map"); 408 } 409 return retval; 410 } 411 412 static errcode_t parse_gd_csum(struct field_set_info *info, char *arg) 413 { 414 415 if (strcmp(arg, "calc") == 0) { 416 ext2fs_group_desc_csum_set(current_fs, set_bg); 417 set_gd = current_fs->group_desc[set_bg]; 418 printf("Checksum set to 0x%04x\n", 419 current_fs->group_desc[set_bg].bg_checksum); 420 return 0; 421 } 422 423 return parse_uint(info, arg); 424 } 425 426 static void print_possible_fields(struct field_set_info *fields) 427 { 428 struct field_set_info *ss; 429 const char *type, *cmd; 430 FILE *f; 431 char name[40], idx[40]; 432 433 if (fields == super_fields) { 434 type = "Superblock"; 435 cmd = "set_super_value"; 436 } else if (fields == inode_fields) { 437 type = "Inode"; 438 cmd = "set_inode"; 439 } else { 440 type = "Block group descriptor"; 441 cmd = "set_block_group"; 442 } 443 f = open_pager(); 444 445 fprintf(f, "%s fields supported by the %s command:\n", type, cmd); 446 447 for (ss = fields ; ss->name ; ss++) { 448 type = "unknown"; 449 if (ss->func == parse_string) 450 type = "string"; 451 else if (ss->func == parse_int) 452 type = "integer"; 453 else if (ss->func == parse_uint) 454 type = "unsigned integer"; 455 else if (ss->func == parse_uuid) 456 type = "UUID"; 457 else if (ss->func == parse_hashalg) 458 type = "hash algorithm"; 459 else if (ss->func == parse_time) 460 type = "date/time"; 461 else if (ss->func == parse_bmap) 462 type = "set physical->logical block map"; 463 strcpy(name, ss->name); 464 if (ss->flags & FLAG_ARRAY) { 465 if (ss->max_idx > 0) 466 sprintf(idx, "[%d]", ss->max_idx); 467 else 468 strcpy(idx, "[]"); 469 strcat(name, idx); 470 } 471 fprintf(f, "\t%-20s\t%s\n", name, type); 472 } 473 close_pager(f); 474 } 475 476 477 void do_set_super(int argc, char *argv[]) 478 { 479 const char *usage = "<field> <value>\n" 480 "\t\"set_super_value -l\" will list the names of " 481 "superblock fields\n\twhich can be set."; 482 static struct field_set_info *ss; 483 484 if ((argc == 2) && !strcmp(argv[1], "-l")) { 485 print_possible_fields(super_fields); 486 return; 487 } 488 489 if (common_args_process(argc, argv, 3, 3, "set_super_value", 490 usage, CHECK_FS_RW)) 491 return; 492 493 if ((ss = find_field(super_fields, argv[1])) == 0) { 494 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); 495 return; 496 } 497 set_sb = *current_fs->super; 498 if (ss->func(ss, argv[2]) == 0) { 499 *current_fs->super = set_sb; 500 ext2fs_mark_super_dirty(current_fs); 501 } 502 } 503 504 void do_set_inode(int argc, char *argv[]) 505 { 506 const char *usage = "<inode> <field> <value>\n" 507 "\t\"set_inode_field -l\" will list the names of " 508 "the fields in an ext2 inode\n\twhich can be set."; 509 static struct field_set_info *ss; 510 511 if ((argc == 2) && !strcmp(argv[1], "-l")) { 512 print_possible_fields(inode_fields); 513 return; 514 } 515 516 if (common_args_process(argc, argv, 4, 4, "set_inode", 517 usage, CHECK_FS_RW)) 518 return; 519 520 if ((ss = find_field(inode_fields, argv[2])) == 0) { 521 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 522 return; 523 } 524 525 set_ino = string_to_inode(argv[1]); 526 if (!set_ino) 527 return; 528 529 if (debugfs_read_inode(set_ino, &set_inode, argv[1])) 530 return; 531 532 if (ss->func(ss, argv[3]) == 0) { 533 if (debugfs_write_inode(set_ino, &set_inode, argv[1])) 534 return; 535 } 536 } 537 538 void do_set_block_group_descriptor(int argc, char *argv[]) 539 { 540 const char *usage = "<bg number> <field> <value>\n" 541 "\t\"set_block_group_descriptor -l\" will list the names of " 542 "the fields in a block group descriptor\n\twhich can be set."; 543 struct field_set_info *ss; 544 char *end; 545 546 if ((argc == 2) && !strcmp(argv[1], "-l")) { 547 print_possible_fields(ext2_bg_fields); 548 return; 549 } 550 551 if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor", 552 usage, CHECK_FS_RW)) 553 return; 554 555 set_bg = strtoul(argv[1], &end, 0); 556 if (*end) { 557 com_err(argv[0], 0, "invalid block group number: %s", argv[1]); 558 return; 559 } 560 561 if (set_bg >= current_fs->group_desc_count) { 562 com_err(argv[0], 0, "block group number too big: %d", set_bg); 563 return; 564 } 565 566 567 if ((ss = find_field(ext2_bg_fields, argv[2])) == 0) { 568 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 569 return; 570 } 571 572 set_gd = current_fs->group_desc[set_bg]; 573 574 if (ss->func(ss, argv[3]) == 0) { 575 current_fs->group_desc[set_bg] = set_gd; 576 ext2fs_mark_super_dirty(current_fs); 577 } 578 } 579
