set_fields.c revision 0edcc2702106ef8ea0d4ab60ef06c0c38b0b87ee
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 { "snapshot_inum", &set_sb.s_snapshot_inum, 4, parse_uint }, 138 { "snapshot_id", &set_sb.s_snapshot_id, 4, parse_uint }, 139 { "snapshot_r_blocks_count", &set_sb.s_snapshot_r_blocks_count, 8, 140 parse_uint }, 141 { "snapshot_list", &set_sb.s_snapshot_list, 4, parse_uint }, 142 { "mount_opts", &set_sb.s_mount_opts, 64, parse_string }, 143 { "usr_quota_inum", &set_sb.s_usr_quota_inum, 4, parse_uint }, 144 { "grp_quota_inum", &set_sb.s_grp_quota_inum, 4, parse_uint }, 145 { 0, 0, 0, 0 } 146}; 147 148static struct field_set_info inode_fields[] = { 149 { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint }, 150 { "mode", &set_inode.i_mode, 2, parse_uint }, 151 { "uid", &set_inode.i_uid, 2, parse_uint }, 152 { "size", &set_inode.i_size, 4, parse_uint }, 153 { "atime", &set_inode.i_atime, 4, parse_time }, 154 { "ctime", &set_inode.i_ctime, 4, parse_time }, 155 { "mtime", &set_inode.i_mtime, 4, parse_time }, 156 { "dtime", &set_inode.i_dtime, 4, parse_time }, 157 { "gid", &set_inode.i_gid, 2, parse_uint }, 158 { "links_count", &set_inode.i_links_count, 2, parse_uint }, 159 { "blocks", &set_inode.i_blocks, 4, parse_uint }, 160 { "flags", &set_inode.i_flags, 4, parse_uint }, 161 { "version", &set_inode.osd1.linux1.l_i_version, 4, parse_uint }, 162 { "translator", &set_inode.osd1.hurd1.h_i_translator, 4, parse_uint }, 163 { "block", &set_inode.i_block[0], 4, parse_uint, FLAG_ARRAY, 164 EXT2_NDIR_BLOCKS }, 165 { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], 4, parse_uint }, 166 { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], 4, parse_uint }, 167 { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], 4, parse_uint }, 168 { "generation", &set_inode.i_generation, 4, parse_uint }, 169 { "file_acl", &set_inode.i_file_acl, 4, parse_uint }, 170 { "file_acl_high", &set_inode.osd2.linux2.l_i_file_acl_high, 2, 171 parse_uint }, 172 { "dir_acl", &set_inode.i_dir_acl, 4, parse_uint }, 173 { "size_high", &set_inode.i_size_high, 4, parse_uint }, 174 { "faddr", &set_inode.i_faddr, 4, parse_uint }, 175 { "blocks_hi", &set_inode.osd2.linux2.l_i_blocks_hi, 2, parse_uint }, 176 { "frag", &set_inode.osd2.hurd2.h_i_frag, 1, parse_uint }, 177 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, 1, parse_uint }, 178 { "uid_high", &set_inode.osd2.linux2.l_i_uid_high, 2, parse_uint }, 179 { "gid_high", &set_inode.osd2.linux2.l_i_gid_high, 2, parse_uint }, 180 { "author", &set_inode.osd2.hurd2.h_i_author, 4, parse_uint }, 181 { "bmap", NULL, 4, parse_bmap, FLAG_ARRAY }, 182 { 0, 0, 0, 0 } 183}; 184 185static struct field_set_info ext2_bg_fields[] = { 186 { "block_bitmap", &set_gd.bg_block_bitmap, 4, parse_uint }, 187 { "inode_bitmap", &set_gd.bg_inode_bitmap, 4, parse_uint }, 188 { "inode_table", &set_gd.bg_inode_table, 4, parse_uint }, 189 { "free_blocks_count", &set_gd.bg_free_blocks_count, 2, parse_uint }, 190 { "free_inodes_count", &set_gd.bg_free_inodes_count, 2, parse_uint }, 191 { "used_dirs_count", &set_gd.bg_used_dirs_count, 2, parse_uint }, 192 { "flags", &set_gd.bg_flags, 2, parse_uint }, 193 { "reserved", &set_gd.bg_reserved, 2, parse_uint, FLAG_ARRAY, 2 }, 194 { "itable_unused", &set_gd.bg_itable_unused, 2, parse_uint }, 195 { "checksum", &set_gd.bg_checksum, 2, parse_gd_csum }, 196 { 0, 0, 0, 0 } 197}; 198 199 200static struct field_set_info *find_field(struct field_set_info *fields, 201 char *field) 202{ 203 struct field_set_info *ss; 204 const char *prefix; 205 char *arg, *delim, *idx, *tmp; 206 int prefix_len; 207 208 if (fields == super_fields) 209 prefix = "s_"; 210 else if (fields == inode_fields) 211 prefix = "i_"; 212 else 213 prefix = "bg_"; 214 prefix_len = strlen(prefix); 215 if (strncmp(field, prefix, prefix_len) == 0) 216 field += prefix_len; 217 218 arg = malloc(strlen(field)+1); 219 if (!arg) 220 return NULL; 221 strcpy(arg, field); 222 223 idx = strchr(arg, '['); 224 if (idx) { 225 *idx++ = 0; 226 delim = idx + strlen(idx) - 1; 227 if (!*idx || *delim != ']') 228 idx = 0; 229 else 230 *delim = 0; 231 } 232 /* 233 * Can we parse the number? 234 */ 235 if (idx) { 236 array_idx = strtol(idx, &tmp, 0); 237 if (*tmp) 238 idx = 0; 239 } 240 241 for (ss = fields ; ss->name ; ss++) { 242 if (ss->flags & FLAG_ARRAY) { 243 if (!idx || (strcmp(ss->name, arg) != 0)) 244 continue; 245 if (ss->max_idx > 0 && array_idx >= ss->max_idx) 246 continue; 247 } else { 248 if (strcmp(ss->name, field) != 0) 249 continue; 250 } 251 free(arg); 252 return ss; 253 } 254 free(arg); 255 return NULL; 256} 257 258static errcode_t parse_uint(struct field_set_info *info, char *arg) 259{ 260 unsigned long long num, limit; 261 char *tmp; 262 union { 263 __u64 *ptr64; 264 __u32 *ptr32; 265 __u16 *ptr16; 266 __u8 *ptr8; 267 } u; 268 269 u.ptr8 = (__u8 *) info->ptr; 270 if (info->flags & FLAG_ARRAY) 271 u.ptr8 += array_idx * info->size; 272 273 errno = 0; 274 num = STRTOULL(arg, &tmp, 0); 275 if (*tmp || errno) { 276 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 277 arg, info->name); 278 return EINVAL; 279 } 280 limit = ~0ULL >> ((8 - info->size) * 8); 281 if (num > limit) { 282 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n", 283 arg, info->name, limit); 284 return EINVAL; 285 } 286 switch (info->size) { 287 case 8: 288 *u.ptr64 = num; 289 break; 290 case 4: 291 *u.ptr32 = num; 292 break; 293 case 2: 294 *u.ptr16 = num; 295 break; 296 case 1: 297 *u.ptr8 = num; 298 break; 299 } 300 return 0; 301} 302 303static errcode_t parse_int(struct field_set_info *info, char *arg) 304{ 305 long num; 306 char *tmp; 307 __s32 *ptr32; 308 __s16 *ptr16; 309 __s8 *ptr8; 310 311 num = strtol(arg, &tmp, 0); 312 if (*tmp) { 313 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 314 arg, info->name); 315 return EINVAL; 316 } 317 switch (info->size) { 318 case 4: 319 ptr32 = (__s32 *) info->ptr; 320 *ptr32 = num; 321 break; 322 case 2: 323 ptr16 = (__s16 *) info->ptr; 324 *ptr16 = num; 325 break; 326 case 1: 327 ptr8 = (__s8 *) info->ptr; 328 *ptr8 = num; 329 break; 330 } 331 return 0; 332} 333 334static errcode_t parse_string(struct field_set_info *info, char *arg) 335{ 336 char *cp = (char *) info->ptr; 337 338 if (strlen(arg) >= info->size) { 339 fprintf(stderr, "Error maximum size for %s is %d.\n", 340 info->name, info->size); 341 return EINVAL; 342 } 343 strcpy(cp, arg); 344 return 0; 345} 346 347static errcode_t parse_time(struct field_set_info *info, char *arg) 348{ 349 time_t t; 350 __u32 *ptr32; 351 352 ptr32 = (__u32 *) info->ptr; 353 354 t = string_to_time(arg); 355 356 if (t == ((time_t) -1)) { 357 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 358 arg, info->name); 359 return EINVAL; 360 } 361 *ptr32 = t; 362 return 0; 363} 364 365static errcode_t parse_uuid(struct field_set_info *info, char *arg) 366{ 367 unsigned char * p = (unsigned char *) info->ptr; 368 369 if ((strcasecmp(arg, "null") == 0) || 370 (strcasecmp(arg, "clear") == 0)) { 371 uuid_clear(p); 372 } else if (strcasecmp(arg, "time") == 0) { 373 uuid_generate_time(p); 374 } else if (strcasecmp(arg, "random") == 0) { 375 uuid_generate(p); 376 } else if (uuid_parse(arg, p)) { 377 fprintf(stderr, "Invalid UUID format: %s\n", arg); 378 return EINVAL; 379 } 380 return 0; 381} 382 383static errcode_t parse_hashalg(struct field_set_info *info, char *arg) 384{ 385 int hashv; 386 unsigned char *p = (unsigned char *) info->ptr; 387 388 hashv = e2p_string2hash(arg); 389 if (hashv < 0) { 390 fprintf(stderr, "Invalid hash algorithm: %s\n", arg); 391 return EINVAL; 392 } 393 *p = hashv; 394 return 0; 395} 396 397static errcode_t parse_bmap(struct field_set_info *info, char *arg) 398{ 399 unsigned long num; 400 blk_t blk; 401 errcode_t retval; 402 char *tmp; 403 404 num = strtoul(arg, &tmp, 0); 405 if (*tmp) { 406 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 407 arg, info->name); 408 return EINVAL; 409 } 410 blk = num; 411 412 retval = ext2fs_bmap(current_fs, set_ino, &set_inode, 0, BMAP_SET, 413 array_idx, &blk); 414 if (retval) { 415 com_err("set_inode", retval, "while setting block map"); 416 } 417 return retval; 418} 419 420static errcode_t parse_gd_csum(struct field_set_info *info, char *arg) 421{ 422 423 if (strcmp(arg, "calc") == 0) { 424 ext2fs_group_desc_csum_set(current_fs, set_bg); 425 set_gd = current_fs->group_desc[set_bg]; 426 printf("Checksum set to 0x%04x\n", 427 current_fs->group_desc[set_bg].bg_checksum); 428 return 0; 429 } 430 431 return parse_uint(info, arg); 432} 433 434static void print_possible_fields(struct field_set_info *fields) 435{ 436 struct field_set_info *ss; 437 const char *type, *cmd; 438 FILE *f; 439 char name[40], idx[40]; 440 441 if (fields == super_fields) { 442 type = "Superblock"; 443 cmd = "set_super_value"; 444 } else if (fields == inode_fields) { 445 type = "Inode"; 446 cmd = "set_inode"; 447 } else { 448 type = "Block group descriptor"; 449 cmd = "set_block_group"; 450 } 451 f = open_pager(); 452 453 fprintf(f, "%s fields supported by the %s command:\n", type, cmd); 454 455 for (ss = fields ; ss->name ; ss++) { 456 type = "unknown"; 457 if (ss->func == parse_string) 458 type = "string"; 459 else if (ss->func == parse_int) 460 type = "integer"; 461 else if (ss->func == parse_uint) 462 type = "unsigned integer"; 463 else if (ss->func == parse_uuid) 464 type = "UUID"; 465 else if (ss->func == parse_hashalg) 466 type = "hash algorithm"; 467 else if (ss->func == parse_time) 468 type = "date/time"; 469 else if (ss->func == parse_bmap) 470 type = "set physical->logical block map"; 471 strcpy(name, ss->name); 472 if (ss->flags & FLAG_ARRAY) { 473 if (ss->max_idx > 0) 474 sprintf(idx, "[%d]", ss->max_idx); 475 else 476 strcpy(idx, "[]"); 477 strcat(name, idx); 478 } 479 fprintf(f, "\t%-20s\t%s\n", name, type); 480 } 481 close_pager(f); 482} 483 484 485void do_set_super(int argc, char *argv[]) 486{ 487 const char *usage = "<field> <value>\n" 488 "\t\"set_super_value -l\" will list the names of " 489 "superblock fields\n\twhich can be set."; 490 static struct field_set_info *ss; 491 492 if ((argc == 2) && !strcmp(argv[1], "-l")) { 493 print_possible_fields(super_fields); 494 return; 495 } 496 497 if (common_args_process(argc, argv, 3, 3, "set_super_value", 498 usage, CHECK_FS_RW)) 499 return; 500 501 if ((ss = find_field(super_fields, argv[1])) == 0) { 502 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); 503 return; 504 } 505 set_sb = *current_fs->super; 506 if (ss->func(ss, argv[2]) == 0) { 507 *current_fs->super = set_sb; 508 ext2fs_mark_super_dirty(current_fs); 509 } 510} 511 512void do_set_inode(int argc, char *argv[]) 513{ 514 const char *usage = "<inode> <field> <value>\n" 515 "\t\"set_inode_field -l\" will list the names of " 516 "the fields in an ext2 inode\n\twhich can be set."; 517 static struct field_set_info *ss; 518 519 if ((argc == 2) && !strcmp(argv[1], "-l")) { 520 print_possible_fields(inode_fields); 521 return; 522 } 523 524 if (common_args_process(argc, argv, 4, 4, "set_inode", 525 usage, CHECK_FS_RW)) 526 return; 527 528 if ((ss = find_field(inode_fields, argv[2])) == 0) { 529 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 530 return; 531 } 532 533 set_ino = string_to_inode(argv[1]); 534 if (!set_ino) 535 return; 536 537 if (debugfs_read_inode(set_ino, &set_inode, argv[1])) 538 return; 539 540 if (ss->func(ss, argv[3]) == 0) { 541 if (debugfs_write_inode(set_ino, &set_inode, argv[1])) 542 return; 543 } 544} 545 546void do_set_block_group_descriptor(int argc, char *argv[]) 547{ 548 const char *usage = "<bg number> <field> <value>\n" 549 "\t\"set_block_group_descriptor -l\" will list the names of " 550 "the fields in a block group descriptor\n\twhich can be set."; 551 struct field_set_info *ss; 552 char *end; 553 554 if ((argc == 2) && !strcmp(argv[1], "-l")) { 555 print_possible_fields(ext2_bg_fields); 556 return; 557 } 558 559 if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor", 560 usage, CHECK_FS_RW)) 561 return; 562 563 set_bg = strtoul(argv[1], &end, 0); 564 if (*end) { 565 com_err(argv[0], 0, "invalid block group number: %s", argv[1]); 566 return; 567 } 568 569 if (set_bg >= current_fs->group_desc_count) { 570 com_err(argv[0], 0, "block group number too big: %d", set_bg); 571 return; 572 } 573 574 575 if ((ss = find_field(ext2_bg_fields, argv[2])) == 0) { 576 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 577 return; 578 } 579 580 set_gd = current_fs->group_desc[set_bg]; 581 582 if (ss->func(ss, argv[3]) == 0) { 583 current_fs->group_desc[set_bg] = set_gd; 584 ext2fs_mark_super_dirty(current_fs); 585 } 586} 587