set_fields.c revision efc6f628e15de95bcd13e4f0ee223cb42115d520
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 42static struct ext2_super_block set_sb; 43static struct ext2_inode set_inode; 44static struct ext2_group_desc set_gd; 45static dgrp_t set_bg; 46static ext2_ino_t set_ino; 47static int array_idx; 48 49#define FLAG_ARRAY 0x0001 50 51struct 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 60static errcode_t parse_uint(struct field_set_info *info, char *arg); 61static errcode_t parse_int(struct field_set_info *info, char *arg); 62static errcode_t parse_string(struct field_set_info *info, char *arg); 63static errcode_t parse_uuid(struct field_set_info *info, char *arg); 64static errcode_t parse_hashalg(struct field_set_info *info, char *arg); 65static errcode_t parse_time(struct field_set_info *info, char *arg); 66static errcode_t parse_bmap(struct field_set_info *info, char *arg); 67static errcode_t parse_gd_csum(struct field_set_info *info, char *arg); 68 69static 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 { 0, 0, 0, 0 } 137}; 138 139static struct field_set_info inode_fields[] = { 140 { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint }, 141 { "mode", &set_inode.i_mode, 2, parse_uint }, 142 { "uid", &set_inode.i_uid, 2, parse_uint }, 143 { "size", &set_inode.i_size, 4, parse_uint }, 144 { "atime", &set_inode.i_atime, 4, parse_time }, 145 { "ctime", &set_inode.i_ctime, 4, parse_time }, 146 { "mtime", &set_inode.i_mtime, 4, parse_time }, 147 { "dtime", &set_inode.i_dtime, 4, parse_time }, 148 { "gid", &set_inode.i_gid, 2, parse_uint }, 149 { "links_count", &set_inode.i_links_count, 2, parse_uint }, 150 { "blocks", &set_inode.i_blocks, 4, parse_uint }, 151 { "flags", &set_inode.i_flags, 4, parse_uint }, 152 { "version", &set_inode.osd1.linux1.l_i_version, 4, parse_uint }, 153 { "translator", &set_inode.osd1.hurd1.h_i_translator, 4, parse_uint }, 154 { "block", &set_inode.i_block[0], 4, parse_uint, FLAG_ARRAY, 155 EXT2_NDIR_BLOCKS }, 156 { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], 4, parse_uint }, 157 { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], 4, parse_uint }, 158 { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], 4, parse_uint }, 159 { "generation", &set_inode.i_generation, 4, parse_uint }, 160 { "file_acl", &set_inode.i_file_acl, 4, parse_uint }, 161 { "dir_acl", &set_inode.i_dir_acl, 4, parse_uint }, 162 { "size_high", &set_inode.i_size_high, 4, parse_uint }, 163 { "faddr", &set_inode.i_faddr, 4, parse_uint }, 164 { "blocks_hi", &set_inode.osd2.linux2.l_i_blocks_hi, 2, parse_uint }, 165 { "frag", &set_inode.osd2.hurd2.h_i_frag, 1, parse_uint }, 166 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, 1, parse_uint }, 167 { "uid_high", &set_inode.osd2.linux2.l_i_uid_high, 2, parse_uint }, 168 { "gid_high", &set_inode.osd2.linux2.l_i_gid_high, 2, parse_uint }, 169 { "author", &set_inode.osd2.hurd2.h_i_author, 4, parse_uint }, 170 { "bmap", NULL, 4, parse_bmap, FLAG_ARRAY }, 171 { 0, 0, 0, 0 } 172}; 173 174static struct field_set_info ext2_bg_fields[] = { 175 { "block_bitmap", &set_gd.bg_block_bitmap, 4, parse_uint }, 176 { "inode_bitmap", &set_gd.bg_inode_bitmap, 4, parse_uint }, 177 { "inode_table", &set_gd.bg_inode_table, 4, parse_uint }, 178 { "free_blocks_count", &set_gd.bg_free_blocks_count, 2, parse_uint }, 179 { "free_inodes_count", &set_gd.bg_free_inodes_count, 2, parse_uint }, 180 { "used_dirs_count", &set_gd.bg_used_dirs_count, 2, parse_uint }, 181 { "flags", &set_gd.bg_flags, 2, parse_uint }, 182 { "reserved", &set_gd.bg_reserved, 2, parse_uint, FLAG_ARRAY, 2 }, 183 { "itable_unused", &set_gd.bg_itable_unused, 2, parse_uint }, 184 { "checksum", &set_gd.bg_checksum, 2, parse_gd_csum }, 185 { 0, 0, 0, 0 } 186}; 187 188 189static struct field_set_info *find_field(struct field_set_info *fields, 190 char *field) 191{ 192 struct field_set_info *ss; 193 const char *prefix; 194 char *arg, *delim, *idx, *tmp; 195 int prefix_len; 196 197 if (fields == super_fields) 198 prefix = "s_"; 199 else if (fields == inode_fields) 200 prefix = "i_"; 201 else 202 prefix = "bg_"; 203 prefix_len = strlen(prefix); 204 if (strncmp(field, prefix, prefix_len) == 0) 205 field += prefix_len; 206 207 arg = malloc(strlen(field)+1); 208 if (!arg) 209 return NULL; 210 strcpy(arg, field); 211 212 idx = strchr(arg, '['); 213 if (idx) { 214 *idx++ = 0; 215 delim = idx + strlen(idx) - 1; 216 if (!*idx || *delim != ']') 217 idx = 0; 218 else 219 *delim = 0; 220 } 221 /* 222 * Can we parse the number? 223 */ 224 if (idx) { 225 array_idx = strtol(idx, &tmp, 0); 226 if (*tmp) 227 idx = 0; 228 } 229 230 for (ss = fields ; ss->name ; ss++) { 231 if (ss->flags & FLAG_ARRAY) { 232 if (!idx || (strcmp(ss->name, arg) != 0)) 233 continue; 234 if (ss->max_idx > 0 && array_idx >= ss->max_idx) 235 continue; 236 } else { 237 if (strcmp(ss->name, field) != 0) 238 continue; 239 } 240 return ss; 241 } 242 243 return NULL; 244} 245 246static errcode_t parse_uint(struct field_set_info *info, char *arg) 247{ 248 unsigned long long num, limit; 249 char *tmp; 250 union { 251 __u64 *ptr64; 252 __u32 *ptr32; 253 __u16 *ptr16; 254 __u8 *ptr8; 255 } u; 256 257 u.ptr8 = (__u8 *) info->ptr; 258 if (info->flags & FLAG_ARRAY) 259 u.ptr8 += array_idx * info->size; 260 261 errno = 0; 262 num = STRTOULL(arg, &tmp, 0); 263 if (*tmp || errno) { 264 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 265 arg, info->name); 266 return EINVAL; 267 } 268 limit = ~0ULL >> ((8 - info->size) * 8); 269 if (num > limit) { 270 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n", 271 arg, info->name, limit); 272 return EINVAL; 273 } 274 switch (info->size) { 275 case 8: 276 *u.ptr64 = num; 277 break; 278 case 4: 279 *u.ptr32 = num; 280 break; 281 case 2: 282 *u.ptr16 = num; 283 break; 284 case 1: 285 *u.ptr8 = num; 286 break; 287 } 288 return 0; 289} 290 291static errcode_t parse_int(struct field_set_info *info, char *arg) 292{ 293 long num; 294 char *tmp; 295 __s32 *ptr32; 296 __s16 *ptr16; 297 __s8 *ptr8; 298 299 num = strtol(arg, &tmp, 0); 300 if (*tmp) { 301 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 302 arg, info->name); 303 return EINVAL; 304 } 305 switch (info->size) { 306 case 4: 307 ptr32 = (__s32 *) info->ptr; 308 *ptr32 = num; 309 break; 310 case 2: 311 ptr16 = (__s16 *) info->ptr; 312 *ptr16 = num; 313 break; 314 case 1: 315 ptr8 = (__s8 *) info->ptr; 316 *ptr8 = num; 317 break; 318 } 319 return 0; 320} 321 322static errcode_t parse_string(struct field_set_info *info, char *arg) 323{ 324 char *cp = (char *) info->ptr; 325 326 if (strlen(arg) >= info->size) { 327 fprintf(stderr, "Error maximum size for %s is %d.\n", 328 info->name, info->size); 329 return EINVAL; 330 } 331 strcpy(cp, arg); 332 return 0; 333} 334 335static errcode_t parse_time(struct field_set_info *info, char *arg) 336{ 337 time_t t; 338 __u32 *ptr32; 339 340 ptr32 = (__u32 *) info->ptr; 341 342 t = string_to_time(arg); 343 344 if (t == ((time_t) -1)) { 345 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 346 arg, info->name); 347 return EINVAL; 348 } 349 *ptr32 = t; 350 return 0; 351} 352 353static errcode_t parse_uuid(struct field_set_info *info, char *arg) 354{ 355 unsigned char * p = (unsigned char *) info->ptr; 356 357 if ((strcasecmp(arg, "null") == 0) || 358 (strcasecmp(arg, "clear") == 0)) { 359 uuid_clear(p); 360 } else if (strcasecmp(arg, "time") == 0) { 361 uuid_generate_time(p); 362 } else if (strcasecmp(arg, "random") == 0) { 363 uuid_generate(p); 364 } else if (uuid_parse(arg, p)) { 365 fprintf(stderr, "Invalid UUID format: %s\n", arg); 366 return EINVAL; 367 } 368 return 0; 369} 370 371static errcode_t parse_hashalg(struct field_set_info *info, char *arg) 372{ 373 int hashv; 374 unsigned char *p = (unsigned char *) info->ptr; 375 376 hashv = e2p_string2hash(arg); 377 if (hashv < 0) { 378 fprintf(stderr, "Invalid hash algorithm: %s\n", arg); 379 return EINVAL; 380 } 381 *p = hashv; 382 return 0; 383} 384 385static errcode_t parse_bmap(struct field_set_info *info, char *arg) 386{ 387 unsigned long num; 388 blk_t blk; 389 errcode_t retval; 390 char *tmp; 391 392 num = strtoul(arg, &tmp, 0); 393 if (*tmp) { 394 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 395 arg, info->name); 396 return EINVAL; 397 } 398 blk = num; 399 400 retval = ext2fs_bmap(current_fs, set_ino, &set_inode, 0, BMAP_SET, 401 array_idx, &blk); 402 if (retval) { 403 com_err("set_inode", retval, "while setting block map"); 404 } 405 return retval; 406} 407 408static errcode_t parse_gd_csum(struct field_set_info *info, char *arg) 409{ 410 411 if (strcmp(arg, "calc") == 0) { 412 ext2fs_group_desc_csum_set(current_fs, set_bg); 413 set_gd = current_fs->group_desc[set_bg]; 414 printf("Checksum set to 0x%04x\n", 415 current_fs->group_desc[set_bg].bg_checksum); 416 return 0; 417 } 418 419 return parse_uint(info, arg); 420} 421 422static void print_possible_fields(struct field_set_info *fields) 423{ 424 struct field_set_info *ss; 425 const char *type, *cmd; 426 FILE *f; 427 char name[40], idx[40]; 428 429 if (fields == super_fields) { 430 type = "Superblock"; 431 cmd = "set_super_value"; 432 } else if (fields == inode_fields) { 433 type = "Inode"; 434 cmd = "set_inode"; 435 } else { 436 type = "Block group descriptor"; 437 cmd = "set_block_group"; 438 } 439 f = open_pager(); 440 441 fprintf(f, "%s fields supported by the %s command:\n", type, cmd); 442 443 for (ss = fields ; ss->name ; ss++) { 444 type = "unknown"; 445 if (ss->func == parse_string) 446 type = "string"; 447 else if (ss->func == parse_int) 448 type = "integer"; 449 else if (ss->func == parse_uint) 450 type = "unsigned integer"; 451 else if (ss->func == parse_uuid) 452 type = "UUID"; 453 else if (ss->func == parse_hashalg) 454 type = "hash algorithm"; 455 else if (ss->func == parse_time) 456 type = "date/time"; 457 else if (ss->func == parse_bmap) 458 type = "set physical->logical block map"; 459 strcpy(name, ss->name); 460 if (ss->flags & FLAG_ARRAY) { 461 if (ss->max_idx > 0) 462 sprintf(idx, "[%d]", ss->max_idx); 463 else 464 strcpy(idx, "[]"); 465 strcat(name, idx); 466 } 467 fprintf(f, "\t%-20s\t%s\n", name, type); 468 } 469 close_pager(f); 470} 471 472 473void do_set_super(int argc, char *argv[]) 474{ 475 const char *usage = "<field> <value>\n" 476 "\t\"set_super_value -l\" will list the names of " 477 "superblock fields\n\twhich can be set."; 478 static struct field_set_info *ss; 479 480 if ((argc == 2) && !strcmp(argv[1], "-l")) { 481 print_possible_fields(super_fields); 482 return; 483 } 484 485 if (common_args_process(argc, argv, 3, 3, "set_super_value", 486 usage, CHECK_FS_RW)) 487 return; 488 489 if ((ss = find_field(super_fields, argv[1])) == 0) { 490 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); 491 return; 492 } 493 set_sb = *current_fs->super; 494 if (ss->func(ss, argv[2]) == 0) { 495 *current_fs->super = set_sb; 496 ext2fs_mark_super_dirty(current_fs); 497 } 498} 499 500void do_set_inode(int argc, char *argv[]) 501{ 502 const char *usage = "<inode> <field> <value>\n" 503 "\t\"set_inode_field -l\" will list the names of " 504 "the fields in an ext2 inode\n\twhich can be set."; 505 static struct field_set_info *ss; 506 507 if ((argc == 2) && !strcmp(argv[1], "-l")) { 508 print_possible_fields(inode_fields); 509 return; 510 } 511 512 if (common_args_process(argc, argv, 4, 4, "set_inode", 513 usage, CHECK_FS_RW)) 514 return; 515 516 if ((ss = find_field(inode_fields, argv[2])) == 0) { 517 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 518 return; 519 } 520 521 set_ino = string_to_inode(argv[1]); 522 if (!set_ino) 523 return; 524 525 if (debugfs_read_inode(set_ino, &set_inode, argv[1])) 526 return; 527 528 if (ss->func(ss, argv[3]) == 0) { 529 if (debugfs_write_inode(set_ino, &set_inode, argv[1])) 530 return; 531 } 532} 533 534void do_set_block_group_descriptor(int argc, char *argv[]) 535{ 536 const char *usage = "<bg number> <field> <value>\n" 537 "\t\"set_block_group_descriptor -l\" will list the names of " 538 "the fields in a block group descriptor\n\twhich can be set."; 539 struct field_set_info *ss; 540 char *end; 541 542 if ((argc == 2) && !strcmp(argv[1], "-l")) { 543 print_possible_fields(ext2_bg_fields); 544 return; 545 } 546 547 if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor", 548 usage, CHECK_FS_RW)) 549 return; 550 551 set_bg = strtoul(argv[1], &end, 0); 552 if (*end) { 553 com_err(argv[0], 0, "invalid block group number: %s", argv[1]); 554 return; 555 } 556 557 if (set_bg >= current_fs->group_desc_count) { 558 com_err(argv[0], 0, "block group number too big: %d", set_bg); 559 return; 560 } 561 562 563 if ((ss = find_field(ext2_bg_fields, argv[2])) == 0) { 564 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 565 return; 566 } 567 568 set_gd = current_fs->group_desc[set_bg]; 569 570 if (ss->func(ss, argv[3]) == 0) { 571 current_fs->group_desc[set_bg] = set_gd; 572 ext2fs_mark_super_dirty(current_fs); 573 } 574} 575