set_fields.c revision 4df1618250349dbe71f9474c42d52d7d03cc68a0
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_cluster_size", &set_sb.s_log_cluster_size, 4, parse_int }, 78 { "blocks_per_group", &set_sb.s_blocks_per_group, 4, parse_uint }, 79 { "clusters_per_group", &set_sb.s_clusters_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 { "overhead_blocks", &set_sb.s_overhead_blocks, 4, parse_uint }, 146 { 0, 0, 0, 0 } 147}; 148 149static struct field_set_info inode_fields[] = { 150 { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint }, 151 { "mode", &set_inode.i_mode, 2, parse_uint }, 152 { "uid", &set_inode.i_uid, 2, parse_uint }, 153 { "size", &set_inode.i_size, 4, parse_uint }, 154 { "atime", &set_inode.i_atime, 4, parse_time }, 155 { "ctime", &set_inode.i_ctime, 4, parse_time }, 156 { "mtime", &set_inode.i_mtime, 4, parse_time }, 157 { "dtime", &set_inode.i_dtime, 4, parse_time }, 158 { "gid", &set_inode.i_gid, 2, parse_uint }, 159 { "links_count", &set_inode.i_links_count, 2, parse_uint }, 160 { "blocks", &set_inode.i_blocks, 4, parse_uint }, 161 { "flags", &set_inode.i_flags, 4, parse_uint }, 162 { "version", &set_inode.osd1.linux1.l_i_version, 4, parse_uint }, 163 { "translator", &set_inode.osd1.hurd1.h_i_translator, 4, parse_uint }, 164 { "block", &set_inode.i_block[0], 4, parse_uint, FLAG_ARRAY, 165 EXT2_NDIR_BLOCKS }, 166 { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], 4, parse_uint }, 167 { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], 4, parse_uint }, 168 { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], 4, parse_uint }, 169 { "generation", &set_inode.i_generation, 4, parse_uint }, 170 { "file_acl", &set_inode.i_file_acl, 4, parse_uint }, 171 { "file_acl_high", &set_inode.osd2.linux2.l_i_file_acl_high, 2, 172 parse_uint }, 173 { "dir_acl", &set_inode.i_dir_acl, 4, parse_uint }, 174 { "size_high", &set_inode.i_size_high, 4, parse_uint }, 175 { "faddr", &set_inode.i_faddr, 4, parse_uint }, 176 { "blocks_hi", &set_inode.osd2.linux2.l_i_blocks_hi, 2, parse_uint }, 177 { "frag", &set_inode.osd2.hurd2.h_i_frag, 1, parse_uint }, 178 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, 1, parse_uint }, 179 { "uid_high", &set_inode.osd2.linux2.l_i_uid_high, 2, parse_uint }, 180 { "gid_high", &set_inode.osd2.linux2.l_i_gid_high, 2, parse_uint }, 181 { "author", &set_inode.osd2.hurd2.h_i_author, 4, parse_uint }, 182 { "bmap", NULL, 4, parse_bmap, FLAG_ARRAY }, 183 { 0, 0, 0, 0 } 184}; 185 186static struct field_set_info ext2_bg_fields[] = { 187 { "block_bitmap", &set_gd.bg_block_bitmap, 4, parse_uint }, 188 { "inode_bitmap", &set_gd.bg_inode_bitmap, 4, parse_uint }, 189 { "inode_table", &set_gd.bg_inode_table, 4, parse_uint }, 190 { "free_blocks_count", &set_gd.bg_free_blocks_count, 2, parse_uint }, 191 { "free_inodes_count", &set_gd.bg_free_inodes_count, 2, parse_uint }, 192 { "used_dirs_count", &set_gd.bg_used_dirs_count, 2, parse_uint }, 193 { "flags", &set_gd.bg_flags, 2, parse_uint }, 194 { "reserved", &set_gd.bg_reserved, 2, parse_uint, FLAG_ARRAY, 2 }, 195 { "itable_unused", &set_gd.bg_itable_unused, 2, parse_uint }, 196 { "checksum", &set_gd.bg_checksum, 2, parse_gd_csum }, 197 { 0, 0, 0, 0 } 198}; 199 200 201static struct field_set_info *find_field(struct field_set_info *fields, 202 char *field) 203{ 204 struct field_set_info *ss; 205 const char *prefix; 206 char *arg, *delim, *idx, *tmp; 207 int prefix_len; 208 209 if (fields == super_fields) 210 prefix = "s_"; 211 else if (fields == inode_fields) 212 prefix = "i_"; 213 else 214 prefix = "bg_"; 215 prefix_len = strlen(prefix); 216 if (strncmp(field, prefix, prefix_len) == 0) 217 field += prefix_len; 218 219 arg = malloc(strlen(field)+1); 220 if (!arg) 221 return NULL; 222 strcpy(arg, field); 223 224 idx = strchr(arg, '['); 225 if (idx) { 226 *idx++ = 0; 227 delim = idx + strlen(idx) - 1; 228 if (!*idx || *delim != ']') 229 idx = 0; 230 else 231 *delim = 0; 232 } 233 /* 234 * Can we parse the number? 235 */ 236 if (idx) { 237 array_idx = strtol(idx, &tmp, 0); 238 if (*tmp) 239 idx = 0; 240 } 241 242 for (ss = fields ; ss->name ; ss++) { 243 if (ss->flags & FLAG_ARRAY) { 244 if (!idx || (strcmp(ss->name, arg) != 0)) 245 continue; 246 if (ss->max_idx > 0 && array_idx >= ss->max_idx) 247 continue; 248 } else { 249 if (strcmp(ss->name, field) != 0) 250 continue; 251 } 252 free(arg); 253 return ss; 254 } 255 free(arg); 256 return NULL; 257} 258 259static errcode_t parse_uint(struct field_set_info *info, char *arg) 260{ 261 unsigned long long num, limit; 262 char *tmp; 263 union { 264 __u64 *ptr64; 265 __u32 *ptr32; 266 __u16 *ptr16; 267 __u8 *ptr8; 268 } u; 269 270 u.ptr8 = (__u8 *) info->ptr; 271 if (info->flags & FLAG_ARRAY) 272 u.ptr8 += array_idx * info->size; 273 274 errno = 0; 275 num = STRTOULL(arg, &tmp, 0); 276 if (*tmp || errno) { 277 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 278 arg, info->name); 279 return EINVAL; 280 } 281 limit = ~0ULL >> ((8 - info->size) * 8); 282 if (num > limit) { 283 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n", 284 arg, info->name, limit); 285 return EINVAL; 286 } 287 switch (info->size) { 288 case 8: 289 *u.ptr64 = num; 290 break; 291 case 4: 292 *u.ptr32 = num; 293 break; 294 case 2: 295 *u.ptr16 = num; 296 break; 297 case 1: 298 *u.ptr8 = num; 299 break; 300 } 301 return 0; 302} 303 304static errcode_t parse_int(struct field_set_info *info, char *arg) 305{ 306 long num; 307 char *tmp; 308 __s32 *ptr32; 309 __s16 *ptr16; 310 __s8 *ptr8; 311 312 num = strtol(arg, &tmp, 0); 313 if (*tmp) { 314 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 315 arg, info->name); 316 return EINVAL; 317 } 318 switch (info->size) { 319 case 4: 320 ptr32 = (__s32 *) info->ptr; 321 *ptr32 = num; 322 break; 323 case 2: 324 ptr16 = (__s16 *) info->ptr; 325 *ptr16 = num; 326 break; 327 case 1: 328 ptr8 = (__s8 *) info->ptr; 329 *ptr8 = num; 330 break; 331 } 332 return 0; 333} 334 335static errcode_t parse_string(struct field_set_info *info, char *arg) 336{ 337 char *cp = (char *) info->ptr; 338 339 if (strlen(arg) >= info->size) { 340 fprintf(stderr, "Error maximum size for %s is %d.\n", 341 info->name, info->size); 342 return EINVAL; 343 } 344 strcpy(cp, arg); 345 return 0; 346} 347 348static errcode_t parse_time(struct field_set_info *info, char *arg) 349{ 350 time_t t; 351 __u32 *ptr32; 352 353 ptr32 = (__u32 *) info->ptr; 354 355 t = string_to_time(arg); 356 357 if (t == ((time_t) -1)) { 358 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 359 arg, info->name); 360 return EINVAL; 361 } 362 *ptr32 = t; 363 return 0; 364} 365 366static errcode_t parse_uuid(struct field_set_info *info, char *arg) 367{ 368 unsigned char * p = (unsigned char *) info->ptr; 369 370 if ((strcasecmp(arg, "null") == 0) || 371 (strcasecmp(arg, "clear") == 0)) { 372 uuid_clear(p); 373 } else if (strcasecmp(arg, "time") == 0) { 374 uuid_generate_time(p); 375 } else if (strcasecmp(arg, "random") == 0) { 376 uuid_generate(p); 377 } else if (uuid_parse(arg, p)) { 378 fprintf(stderr, "Invalid UUID format: %s\n", arg); 379 return EINVAL; 380 } 381 return 0; 382} 383 384static errcode_t parse_hashalg(struct field_set_info *info, char *arg) 385{ 386 int hashv; 387 unsigned char *p = (unsigned char *) info->ptr; 388 389 hashv = e2p_string2hash(arg); 390 if (hashv < 0) { 391 fprintf(stderr, "Invalid hash algorithm: %s\n", arg); 392 return EINVAL; 393 } 394 *p = hashv; 395 return 0; 396} 397 398static errcode_t parse_bmap(struct field_set_info *info, char *arg) 399{ 400 unsigned long num; 401 blk_t blk; 402 errcode_t retval; 403 char *tmp; 404 405 num = strtoul(arg, &tmp, 0); 406 if (*tmp) { 407 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 408 arg, info->name); 409 return EINVAL; 410 } 411 blk = num; 412 413 retval = ext2fs_bmap(current_fs, set_ino, &set_inode, 0, BMAP_SET, 414 array_idx, &blk); 415 if (retval) { 416 com_err("set_inode", retval, "while setting block map"); 417 } 418 return retval; 419} 420 421static errcode_t parse_gd_csum(struct field_set_info *info, char *arg) 422{ 423 424 if (strcmp(arg, "calc") == 0) { 425 ext2fs_group_desc_csum_set(current_fs, set_bg); 426 set_gd = current_fs->group_desc[set_bg]; 427 printf("Checksum set to 0x%04x\n", 428 current_fs->group_desc[set_bg].bg_checksum); 429 return 0; 430 } 431 432 return parse_uint(info, arg); 433} 434 435static void print_possible_fields(struct field_set_info *fields) 436{ 437 struct field_set_info *ss; 438 const char *type, *cmd; 439 FILE *f; 440 char name[40], idx[40]; 441 442 if (fields == super_fields) { 443 type = "Superblock"; 444 cmd = "set_super_value"; 445 } else if (fields == inode_fields) { 446 type = "Inode"; 447 cmd = "set_inode"; 448 } else { 449 type = "Block group descriptor"; 450 cmd = "set_block_group"; 451 } 452 f = open_pager(); 453 454 fprintf(f, "%s fields supported by the %s command:\n", type, cmd); 455 456 for (ss = fields ; ss->name ; ss++) { 457 type = "unknown"; 458 if (ss->func == parse_string) 459 type = "string"; 460 else if (ss->func == parse_int) 461 type = "integer"; 462 else if (ss->func == parse_uint) 463 type = "unsigned integer"; 464 else if (ss->func == parse_uuid) 465 type = "UUID"; 466 else if (ss->func == parse_hashalg) 467 type = "hash algorithm"; 468 else if (ss->func == parse_time) 469 type = "date/time"; 470 else if (ss->func == parse_bmap) 471 type = "set physical->logical block map"; 472 strcpy(name, ss->name); 473 if (ss->flags & FLAG_ARRAY) { 474 if (ss->max_idx > 0) 475 sprintf(idx, "[%d]", ss->max_idx); 476 else 477 strcpy(idx, "[]"); 478 strcat(name, idx); 479 } 480 fprintf(f, "\t%-20s\t%s\n", name, type); 481 } 482 close_pager(f); 483} 484 485 486void do_set_super(int argc, char *argv[]) 487{ 488 const char *usage = "<field> <value>\n" 489 "\t\"set_super_value -l\" will list the names of " 490 "superblock fields\n\twhich can be set."; 491 static struct field_set_info *ss; 492 493 if ((argc == 2) && !strcmp(argv[1], "-l")) { 494 print_possible_fields(super_fields); 495 return; 496 } 497 498 if (common_args_process(argc, argv, 3, 3, "set_super_value", 499 usage, CHECK_FS_RW)) 500 return; 501 502 if ((ss = find_field(super_fields, argv[1])) == 0) { 503 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); 504 return; 505 } 506 set_sb = *current_fs->super; 507 if (ss->func(ss, argv[2]) == 0) { 508 *current_fs->super = set_sb; 509 ext2fs_mark_super_dirty(current_fs); 510 } 511} 512 513void do_set_inode(int argc, char *argv[]) 514{ 515 const char *usage = "<inode> <field> <value>\n" 516 "\t\"set_inode_field -l\" will list the names of " 517 "the fields in an ext2 inode\n\twhich can be set."; 518 static struct field_set_info *ss; 519 520 if ((argc == 2) && !strcmp(argv[1], "-l")) { 521 print_possible_fields(inode_fields); 522 return; 523 } 524 525 if (common_args_process(argc, argv, 4, 4, "set_inode", 526 usage, CHECK_FS_RW)) 527 return; 528 529 if ((ss = find_field(inode_fields, argv[2])) == 0) { 530 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 531 return; 532 } 533 534 set_ino = string_to_inode(argv[1]); 535 if (!set_ino) 536 return; 537 538 if (debugfs_read_inode(set_ino, &set_inode, argv[1])) 539 return; 540 541 if (ss->func(ss, argv[3]) == 0) { 542 if (debugfs_write_inode(set_ino, &set_inode, argv[1])) 543 return; 544 } 545} 546 547void do_set_block_group_descriptor(int argc, char *argv[]) 548{ 549 const char *usage = "<bg number> <field> <value>\n" 550 "\t\"set_block_group_descriptor -l\" will list the names of " 551 "the fields in a block group descriptor\n\twhich can be set."; 552 struct field_set_info *ss; 553 char *end; 554 555 if ((argc == 2) && !strcmp(argv[1], "-l")) { 556 print_possible_fields(ext2_bg_fields); 557 return; 558 } 559 560 if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor", 561 usage, CHECK_FS_RW)) 562 return; 563 564 set_bg = strtoul(argv[1], &end, 0); 565 if (*end) { 566 com_err(argv[0], 0, "invalid block group number: %s", argv[1]); 567 return; 568 } 569 570 if (set_bg >= current_fs->group_desc_count) { 571 com_err(argv[0], 0, "block group number too big: %d", set_bg); 572 return; 573 } 574 575 576 if ((ss = find_field(ext2_bg_fields, argv[2])) == 0) { 577 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 578 return; 579 } 580 581 set_gd = current_fs->group_desc[set_bg]; 582 583 if (ss->func(ss, argv[3]) == 0) { 584 current_fs->group_desc[set_bg] = set_gd; 585 ext2fs_mark_super_dirty(current_fs); 586 } 587} 588