set_fields.c revision b7c5b4030870b31d73019d9d9ec55d550772590b
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 { "kbytes_written", &set_sb.s_kbytes_written, 8, parse_uint }, 137 { 0, 0, 0, 0 } 138}; 139 140static 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 { "dir_acl", &set_inode.i_dir_acl, 4, parse_uint }, 163 { "size_high", &set_inode.i_size_high, 4, parse_uint }, 164 { "faddr", &set_inode.i_faddr, 4, parse_uint }, 165 { "blocks_hi", &set_inode.osd2.linux2.l_i_blocks_hi, 2, parse_uint }, 166 { "frag", &set_inode.osd2.hurd2.h_i_frag, 1, parse_uint }, 167 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, 1, parse_uint }, 168 { "uid_high", &set_inode.osd2.linux2.l_i_uid_high, 2, parse_uint }, 169 { "gid_high", &set_inode.osd2.linux2.l_i_gid_high, 2, parse_uint }, 170 { "author", &set_inode.osd2.hurd2.h_i_author, 4, parse_uint }, 171 { "bmap", NULL, 4, parse_bmap, FLAG_ARRAY }, 172 { 0, 0, 0, 0 } 173}; 174 175static struct field_set_info ext2_bg_fields[] = { 176 { "block_bitmap", &set_gd.bg_block_bitmap, 4, parse_uint }, 177 { "inode_bitmap", &set_gd.bg_inode_bitmap, 4, parse_uint }, 178 { "inode_table", &set_gd.bg_inode_table, 4, parse_uint }, 179 { "free_blocks_count", &set_gd.bg_free_blocks_count, 2, parse_uint }, 180 { "free_inodes_count", &set_gd.bg_free_inodes_count, 2, parse_uint }, 181 { "used_dirs_count", &set_gd.bg_used_dirs_count, 2, parse_uint }, 182 { "flags", &set_gd.bg_flags, 2, parse_uint }, 183 { "reserved", &set_gd.bg_reserved, 2, parse_uint, FLAG_ARRAY, 2 }, 184 { "itable_unused", &set_gd.bg_itable_unused, 2, parse_uint }, 185 { "checksum", &set_gd.bg_checksum, 2, parse_gd_csum }, 186 { 0, 0, 0, 0 } 187}; 188 189 190static struct field_set_info *find_field(struct field_set_info *fields, 191 char *field) 192{ 193 struct field_set_info *ss; 194 const char *prefix; 195 char *arg, *delim, *idx, *tmp; 196 int prefix_len; 197 198 if (fields == super_fields) 199 prefix = "s_"; 200 else if (fields == inode_fields) 201 prefix = "i_"; 202 else 203 prefix = "bg_"; 204 prefix_len = strlen(prefix); 205 if (strncmp(field, prefix, prefix_len) == 0) 206 field += prefix_len; 207 208 arg = malloc(strlen(field)+1); 209 if (!arg) 210 return NULL; 211 strcpy(arg, field); 212 213 idx = strchr(arg, '['); 214 if (idx) { 215 *idx++ = 0; 216 delim = idx + strlen(idx) - 1; 217 if (!*idx || *delim != ']') 218 idx = 0; 219 else 220 *delim = 0; 221 } 222 /* 223 * Can we parse the number? 224 */ 225 if (idx) { 226 array_idx = strtol(idx, &tmp, 0); 227 if (*tmp) 228 idx = 0; 229 } 230 231 for (ss = fields ; ss->name ; ss++) { 232 if (ss->flags & FLAG_ARRAY) { 233 if (!idx || (strcmp(ss->name, arg) != 0)) 234 continue; 235 if (ss->max_idx > 0 && array_idx >= ss->max_idx) 236 continue; 237 } else { 238 if (strcmp(ss->name, field) != 0) 239 continue; 240 } 241 return ss; 242 } 243 244 return NULL; 245} 246 247static errcode_t parse_uint(struct field_set_info *info, char *arg) 248{ 249 unsigned long long num, limit; 250 char *tmp; 251 union { 252 __u64 *ptr64; 253 __u32 *ptr32; 254 __u16 *ptr16; 255 __u8 *ptr8; 256 } u; 257 258 u.ptr8 = (__u8 *) info->ptr; 259 if (info->flags & FLAG_ARRAY) 260 u.ptr8 += array_idx * info->size; 261 262 errno = 0; 263 num = STRTOULL(arg, &tmp, 0); 264 if (*tmp || errno) { 265 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 266 arg, info->name); 267 return EINVAL; 268 } 269 limit = ~0ULL >> ((8 - info->size) * 8); 270 if (num > limit) { 271 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n", 272 arg, info->name, limit); 273 return EINVAL; 274 } 275 switch (info->size) { 276 case 8: 277 *u.ptr64 = num; 278 break; 279 case 4: 280 *u.ptr32 = num; 281 break; 282 case 2: 283 *u.ptr16 = num; 284 break; 285 case 1: 286 *u.ptr8 = num; 287 break; 288 } 289 return 0; 290} 291 292static errcode_t parse_int(struct field_set_info *info, char *arg) 293{ 294 long num; 295 char *tmp; 296 __s32 *ptr32; 297 __s16 *ptr16; 298 __s8 *ptr8; 299 300 num = strtol(arg, &tmp, 0); 301 if (*tmp) { 302 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 303 arg, info->name); 304 return EINVAL; 305 } 306 switch (info->size) { 307 case 4: 308 ptr32 = (__s32 *) info->ptr; 309 *ptr32 = num; 310 break; 311 case 2: 312 ptr16 = (__s16 *) info->ptr; 313 *ptr16 = num; 314 break; 315 case 1: 316 ptr8 = (__s8 *) info->ptr; 317 *ptr8 = num; 318 break; 319 } 320 return 0; 321} 322 323static errcode_t parse_string(struct field_set_info *info, char *arg) 324{ 325 char *cp = (char *) info->ptr; 326 327 if (strlen(arg) >= info->size) { 328 fprintf(stderr, "Error maximum size for %s is %d.\n", 329 info->name, info->size); 330 return EINVAL; 331 } 332 strcpy(cp, arg); 333 return 0; 334} 335 336static errcode_t parse_time(struct field_set_info *info, char *arg) 337{ 338 time_t t; 339 __u32 *ptr32; 340 341 ptr32 = (__u32 *) info->ptr; 342 343 t = string_to_time(arg); 344 345 if (t == ((time_t) -1)) { 346 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 347 arg, info->name); 348 return EINVAL; 349 } 350 *ptr32 = t; 351 return 0; 352} 353 354static errcode_t parse_uuid(struct field_set_info *info, char *arg) 355{ 356 unsigned char * p = (unsigned char *) info->ptr; 357 358 if ((strcasecmp(arg, "null") == 0) || 359 (strcasecmp(arg, "clear") == 0)) { 360 uuid_clear(p); 361 } else if (strcasecmp(arg, "time") == 0) { 362 uuid_generate_time(p); 363 } else if (strcasecmp(arg, "random") == 0) { 364 uuid_generate(p); 365 } else if (uuid_parse(arg, p)) { 366 fprintf(stderr, "Invalid UUID format: %s\n", arg); 367 return EINVAL; 368 } 369 return 0; 370} 371 372static errcode_t parse_hashalg(struct field_set_info *info, char *arg) 373{ 374 int hashv; 375 unsigned char *p = (unsigned char *) info->ptr; 376 377 hashv = e2p_string2hash(arg); 378 if (hashv < 0) { 379 fprintf(stderr, "Invalid hash algorithm: %s\n", arg); 380 return EINVAL; 381 } 382 *p = hashv; 383 return 0; 384} 385 386static errcode_t parse_bmap(struct field_set_info *info, char *arg) 387{ 388 unsigned long num; 389 blk_t blk; 390 errcode_t retval; 391 char *tmp; 392 393 num = strtoul(arg, &tmp, 0); 394 if (*tmp) { 395 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 396 arg, info->name); 397 return EINVAL; 398 } 399 blk = num; 400 401 retval = ext2fs_bmap(current_fs, set_ino, &set_inode, 0, BMAP_SET, 402 array_idx, &blk); 403 if (retval) { 404 com_err("set_inode", retval, "while setting block map"); 405 } 406 return retval; 407} 408 409static errcode_t parse_gd_csum(struct field_set_info *info, char *arg) 410{ 411 412 if (strcmp(arg, "calc") == 0) { 413 ext2fs_group_desc_csum_set(current_fs, set_bg); 414 set_gd = current_fs->group_desc[set_bg]; 415 printf("Checksum set to 0x%04x\n", 416 current_fs->group_desc[set_bg].bg_checksum); 417 return 0; 418 } 419 420 return parse_uint(info, arg); 421} 422 423static void print_possible_fields(struct field_set_info *fields) 424{ 425 struct field_set_info *ss; 426 const char *type, *cmd; 427 FILE *f; 428 char name[40], idx[40]; 429 430 if (fields == super_fields) { 431 type = "Superblock"; 432 cmd = "set_super_value"; 433 } else if (fields == inode_fields) { 434 type = "Inode"; 435 cmd = "set_inode"; 436 } else { 437 type = "Block group descriptor"; 438 cmd = "set_block_group"; 439 } 440 f = open_pager(); 441 442 fprintf(f, "%s fields supported by the %s command:\n", type, cmd); 443 444 for (ss = fields ; ss->name ; ss++) { 445 type = "unknown"; 446 if (ss->func == parse_string) 447 type = "string"; 448 else if (ss->func == parse_int) 449 type = "integer"; 450 else if (ss->func == parse_uint) 451 type = "unsigned integer"; 452 else if (ss->func == parse_uuid) 453 type = "UUID"; 454 else if (ss->func == parse_hashalg) 455 type = "hash algorithm"; 456 else if (ss->func == parse_time) 457 type = "date/time"; 458 else if (ss->func == parse_bmap) 459 type = "set physical->logical block map"; 460 strcpy(name, ss->name); 461 if (ss->flags & FLAG_ARRAY) { 462 if (ss->max_idx > 0) 463 sprintf(idx, "[%d]", ss->max_idx); 464 else 465 strcpy(idx, "[]"); 466 strcat(name, idx); 467 } 468 fprintf(f, "\t%-20s\t%s\n", name, type); 469 } 470 close_pager(f); 471} 472 473 474void do_set_super(int argc, char *argv[]) 475{ 476 const char *usage = "<field> <value>\n" 477 "\t\"set_super_value -l\" will list the names of " 478 "superblock fields\n\twhich can be set."; 479 static struct field_set_info *ss; 480 481 if ((argc == 2) && !strcmp(argv[1], "-l")) { 482 print_possible_fields(super_fields); 483 return; 484 } 485 486 if (common_args_process(argc, argv, 3, 3, "set_super_value", 487 usage, CHECK_FS_RW)) 488 return; 489 490 if ((ss = find_field(super_fields, argv[1])) == 0) { 491 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); 492 return; 493 } 494 set_sb = *current_fs->super; 495 if (ss->func(ss, argv[2]) == 0) { 496 *current_fs->super = set_sb; 497 ext2fs_mark_super_dirty(current_fs); 498 } 499} 500 501void do_set_inode(int argc, char *argv[]) 502{ 503 const char *usage = "<inode> <field> <value>\n" 504 "\t\"set_inode_field -l\" will list the names of " 505 "the fields in an ext2 inode\n\twhich can be set."; 506 static struct field_set_info *ss; 507 508 if ((argc == 2) && !strcmp(argv[1], "-l")) { 509 print_possible_fields(inode_fields); 510 return; 511 } 512 513 if (common_args_process(argc, argv, 4, 4, "set_inode", 514 usage, CHECK_FS_RW)) 515 return; 516 517 if ((ss = find_field(inode_fields, argv[2])) == 0) { 518 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 519 return; 520 } 521 522 set_ino = string_to_inode(argv[1]); 523 if (!set_ino) 524 return; 525 526 if (debugfs_read_inode(set_ino, &set_inode, argv[1])) 527 return; 528 529 if (ss->func(ss, argv[3]) == 0) { 530 if (debugfs_write_inode(set_ino, &set_inode, argv[1])) 531 return; 532 } 533} 534 535void do_set_block_group_descriptor(int argc, char *argv[]) 536{ 537 const char *usage = "<bg number> <field> <value>\n" 538 "\t\"set_block_group_descriptor -l\" will list the names of " 539 "the fields in a block group descriptor\n\twhich can be set."; 540 struct field_set_info *ss; 541 char *end; 542 543 if ((argc == 2) && !strcmp(argv[1], "-l")) { 544 print_possible_fields(ext2_bg_fields); 545 return; 546 } 547 548 if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor", 549 usage, CHECK_FS_RW)) 550 return; 551 552 set_bg = strtoul(argv[1], &end, 0); 553 if (*end) { 554 com_err(argv[0], 0, "invalid block group number: %s", argv[1]); 555 return; 556 } 557 558 if (set_bg >= current_fs->group_desc_count) { 559 com_err(argv[0], 0, "block group number too big: %d", set_bg); 560 return; 561 } 562 563 564 if ((ss = find_field(ext2_bg_fields, argv[2])) == 0) { 565 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 566 return; 567 } 568 569 set_gd = current_fs->group_desc[set_bg]; 570 571 if (ss->func(ss, argv[3]) == 0) { 572 current_fs->group_desc[set_bg] = set_gd; 573 ext2fs_mark_super_dirty(current_fs); 574 } 575} 576