set_fields.c revision 007df86011373cebc2562c2abf21b5a0b8e7026c
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#include <fcntl.h> 33#include <utime.h> 34 35#include "debugfs.h" 36#include "uuid/uuid.h" 37#include "e2p/e2p.h" 38 39static struct ext2_super_block set_sb; 40static struct ext2_inode set_inode; 41static struct ext2_group_desc set_gd; 42static ext2_ino_t set_ino; 43static int array_idx; 44 45#define FLAG_ARRAY 0x0001 46 47struct field_set_info { 48 const char *name; 49 void *ptr; 50 unsigned int size; 51 errcode_t (*func)(struct field_set_info *info, char *arg); 52 int flags; 53 int max_idx; 54}; 55 56static errcode_t parse_uint(struct field_set_info *info, char *arg); 57static errcode_t parse_int(struct field_set_info *info, char *arg); 58static errcode_t parse_string(struct field_set_info *info, char *arg); 59static errcode_t parse_uuid(struct field_set_info *info, char *arg); 60static errcode_t parse_hashalg(struct field_set_info *info, char *arg); 61static errcode_t parse_time(struct field_set_info *info, char *arg); 62static errcode_t parse_bmap(struct field_set_info *info, char *arg); 63 64static struct field_set_info super_fields[] = { 65 { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint }, 66 { "blocks_count", &set_sb.s_blocks_count, 4, parse_uint }, 67 { "r_blocks_count", &set_sb.s_r_blocks_count, 4, parse_uint }, 68 { "free_blocks_count", &set_sb.s_free_blocks_count, 4, parse_uint }, 69 { "free_inodes_count", &set_sb.s_free_inodes_count, 4, parse_uint }, 70 { "first_data_block", &set_sb.s_first_data_block, 4, parse_uint }, 71 { "log_block_size", &set_sb.s_log_block_size, 4, parse_uint }, 72 { "log_frag_size", &set_sb.s_log_frag_size, 4, parse_int }, 73 { "blocks_per_group", &set_sb.s_blocks_per_group, 4, parse_uint }, 74 { "frags_per_group", &set_sb.s_frags_per_group, 4, parse_uint }, 75 { "inodes_per_group", &set_sb.s_inodes_per_group, 4, parse_uint }, 76 { "mtime", &set_sb.s_mtime, 4, parse_time }, 77 { "wtime", &set_sb.s_wtime, 4, parse_time }, 78 { "mnt_count", &set_sb.s_mnt_count, 2, parse_uint }, 79 { "max_mnt_count", &set_sb.s_max_mnt_count, 2, parse_int }, 80 /* s_magic */ 81 { "state", &set_sb.s_state, 2, parse_uint }, 82 { "errors", &set_sb.s_errors, 2, parse_uint }, 83 { "minor_rev_level", &set_sb.s_minor_rev_level, 2, parse_uint }, 84 { "lastcheck", &set_sb.s_lastcheck, 4, parse_time }, 85 { "checkinterval", &set_sb.s_checkinterval, 4, parse_uint }, 86 { "creator_os", &set_sb.s_creator_os, 4, parse_uint }, 87 { "rev_level", &set_sb.s_rev_level, 4, parse_uint }, 88 { "def_resuid", &set_sb.s_def_resuid, 2, parse_uint }, 89 { "def_resgid", &set_sb.s_def_resgid, 2, parse_uint }, 90 { "first_ino", &set_sb.s_first_ino, 4, parse_uint }, 91 { "inode_size", &set_sb.s_inode_size, 2, parse_uint }, 92 { "block_group_nr", &set_sb.s_block_group_nr, 2, parse_uint }, 93 { "feature_compat", &set_sb.s_feature_compat, 4, parse_uint }, 94 { "feature_incompat", &set_sb.s_feature_incompat, 4, parse_uint }, 95 { "feature_ro_compat", &set_sb.s_feature_ro_compat, 4, parse_uint }, 96 { "uuid", &set_sb.s_uuid, 16, parse_uuid }, 97 { "volume_name", &set_sb.s_volume_name, 16, parse_string }, 98 { "last_mounted", &set_sb.s_last_mounted, 64, parse_string }, 99 { "lastcheck", &set_sb.s_lastcheck, 4, parse_uint }, 100 { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, 101 4, parse_uint }, 102 { "prealloc_blocks", &set_sb.s_prealloc_blocks, 1, parse_uint }, 103 { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, 1, 104 parse_uint }, 105 { "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, 2, 106 parse_uint }, 107 { "journal_uuid", &set_sb.s_journal_uuid, 16, parse_uuid }, 108 { "journal_inum", &set_sb.s_journal_inum, 4, parse_uint }, 109 { "journal_dev", &set_sb.s_journal_dev, 4, parse_uint }, 110 { "last_orphan", &set_sb.s_last_orphan, 4, parse_uint }, 111 { "hash_seed", &set_sb.s_hash_seed, 16, parse_uuid }, 112 { "def_hash_version", &set_sb.s_def_hash_version, 1, parse_hashalg }, 113 { "jnl_backup_type", &set_sb.s_jnl_backup_type, 1, parse_uint }, 114 { "desc_size", &set_sb.s_desc_size, 2, parse_uint }, 115 { "default_mount_opts", &set_sb.s_default_mount_opts, 4, parse_uint }, 116 { "first_meta_bg", &set_sb.s_first_meta_bg, 4, parse_uint }, 117 { "mkfs_time", &set_sb.s_mkfs_time, 4, parse_time }, 118 { "jnl_blocks", &set_sb.s_jnl_blocks[0], 4, parse_uint, FLAG_ARRAY, 119 17 }, 120 { "blocks_count_hi", &set_sb.s_blocks_count_hi, 4, parse_uint }, 121 { "r_blocks_count_hi", &set_sb.s_r_blocks_count_hi, 4, parse_uint }, 122 { "min_extra_isize", &set_sb.s_min_extra_isize, 2, parse_uint }, 123 { "want_extra_isize", &set_sb.s_want_extra_isize, 2, parse_uint }, 124 { "flags", &set_sb.s_flags, 4, parse_uint }, 125 { "raid_stride", &set_sb.s_raid_stride, 2, parse_uint }, 126 { "min_extra_isize", &set_sb.s_min_extra_isize, 4, parse_uint }, 127 { "mmp_interval", &set_sb.s_mmp_interval, 2, parse_uint }, 128 { "mmp_block", &set_sb.s_mmp_block, 8, parse_uint }, 129 { "raid_stripe_width", &set_sb.s_raid_stripe_width, 4, parse_uint }, 130 { 0, 0, 0, 0 } 131}; 132 133static struct field_set_info inode_fields[] = { 134 { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint }, 135 { "mode", &set_inode.i_mode, 2, parse_uint }, 136 { "uid", &set_inode.i_uid, 2, parse_uint }, 137 { "size", &set_inode.i_size, 4, parse_uint }, 138 { "atime", &set_inode.i_atime, 4, parse_time }, 139 { "ctime", &set_inode.i_ctime, 4, parse_time }, 140 { "mtime", &set_inode.i_mtime, 4, parse_time }, 141 { "dtime", &set_inode.i_dtime, 4, parse_time }, 142 { "gid", &set_inode.i_gid, 2, parse_uint }, 143 { "links_count", &set_inode.i_links_count, 2, parse_uint }, 144 { "blocks", &set_inode.i_blocks, 4, parse_uint }, 145 { "flags", &set_inode.i_flags, 4, parse_uint }, 146 { "version", &set_inode.osd1.linux1.l_i_version, 4, parse_uint }, 147 { "translator", &set_inode.osd1.hurd1.h_i_translator, 4, parse_uint }, 148 { "block", &set_inode.i_block[0], 4, parse_uint, FLAG_ARRAY, 149 EXT2_NDIR_BLOCKS }, 150 { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], 4, parse_uint }, 151 { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], 4, parse_uint }, 152 { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], 4, parse_uint }, 153 { "generation", &set_inode.i_generation, 4, parse_uint }, 154 { "file_acl", &set_inode.i_file_acl, 4, parse_uint }, 155 { "dir_acl", &set_inode.i_dir_acl, 4, parse_uint }, 156 { "size_high", &set_inode.i_size_high, 4, parse_uint }, 157 { "faddr", &set_inode.i_faddr, 4, parse_uint }, 158 { "blocks_hi", &set_inode.osd2.linux2.l_i_blocks_hi, 2, parse_uint }, 159 { "frag", &set_inode.osd2.hurd2.h_i_frag, 1, parse_uint }, 160 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, 1, parse_uint }, 161 { "uid_high", &set_inode.osd2.linux2.l_i_uid_high, 2, parse_uint }, 162 { "gid_high", &set_inode.osd2.linux2.l_i_gid_high, 2, parse_uint }, 163 { "author", &set_inode.osd2.hurd2.h_i_author, 4, parse_uint }, 164 { "bmap", NULL, 4, parse_bmap, FLAG_ARRAY }, 165 { 0, 0, 0, 0 } 166}; 167 168static struct field_set_info ext2_bg_fields[] = { 169 { "block_bitmap", &set_gd.bg_block_bitmap, 4, parse_uint }, 170 { "inode_bitmap", &set_gd.bg_inode_bitmap, 4, parse_uint }, 171 { "inode_table", &set_gd.bg_inode_table, 4, parse_uint }, 172 { "free_blocks_count", &set_gd.bg_free_blocks_count, 2, parse_uint }, 173 { "free_inodes_count", &set_gd.bg_free_inodes_count, 2, parse_uint }, 174 { "used_dirs_count", &set_gd.bg_used_dirs_count, 2, parse_uint }, 175 { "flags", &set_gd.bg_flags, 2, parse_uint }, 176 { "reserved", &set_gd.bg_reserved, 2, parse_uint, FLAG_ARRAY, 2 }, 177 { "itable_unused", &set_gd.bg_itable_unused, 2, parse_uint }, 178 { "checksum", &set_gd.bg_checksum, 2, parse_uint }, 179 { 0, 0, 0, 0 } 180}; 181 182 183static struct field_set_info *find_field(struct field_set_info *fields, 184 char *field) 185{ 186 struct field_set_info *ss; 187 const char *prefix; 188 char *arg, *delim, *idx, *tmp; 189 int prefix_len; 190 191 if (fields == super_fields) 192 prefix = "s_"; 193 else if (fields == inode_fields) 194 prefix = "i_"; 195 else 196 prefix = "bg_"; 197 prefix_len = strlen(prefix); 198 if (strncmp(field, prefix, prefix_len) == 0) 199 field += prefix_len; 200 201 arg = malloc(strlen(field)+1); 202 if (!arg) 203 return NULL; 204 strcpy(arg, field); 205 206 idx = strchr(arg, '['); 207 if (idx) { 208 *idx++ = 0; 209 delim = idx + strlen(idx) - 1; 210 if (!*idx || *delim != ']') 211 idx = 0; 212 else 213 *delim = 0; 214 } 215 /* 216 * Can we parse the number? 217 */ 218 if (idx) { 219 array_idx = strtol(idx, &tmp, 0); 220 if (*tmp) 221 idx = 0; 222 } 223 224 for (ss = fields ; ss->name ; ss++) { 225 if (ss->flags & FLAG_ARRAY) { 226 if (!idx || (strcmp(ss->name, arg) != 0)) 227 continue; 228 if (ss->max_idx > 0 && array_idx >= ss->max_idx) 229 continue; 230 } else { 231 if (strcmp(ss->name, field) != 0) 232 continue; 233 } 234 return ss; 235 } 236 237 return NULL; 238} 239 240static errcode_t parse_uint(struct field_set_info *info, char *arg) 241{ 242 unsigned long long num, limit; 243 char *tmp; 244 union { 245 __u64 *ptr64; 246 __u32 *ptr32; 247 __u16 *ptr16; 248 __u8 *ptr8; 249 } u; 250 251 u.ptr8 = (__u8 *) info->ptr; 252 if (info->flags & FLAG_ARRAY) 253 u.ptr8 += array_idx * info->size; 254 255 errno = 0; 256 num = STRTOULL(arg, &tmp, 0); 257 if (*tmp || errno) { 258 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 259 arg, info->name); 260 return EINVAL; 261 } 262 limit = ~0ULL >> ((8 - info->size) * 8); 263 if (num > limit) { 264 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n", 265 arg, info->name, limit); 266 return EINVAL; 267 } 268 switch (info->size) { 269 case 8: 270 *u.ptr64 = num; 271 break; 272 case 4: 273 *u.ptr32 = num; 274 break; 275 case 2: 276 *u.ptr16 = num; 277 break; 278 case 1: 279 *u.ptr8 = num; 280 break; 281 } 282 return 0; 283} 284 285static errcode_t parse_int(struct field_set_info *info, char *arg) 286{ 287 long num; 288 char *tmp; 289 __s32 *ptr32; 290 __s16 *ptr16; 291 __s8 *ptr8; 292 293 num = strtol(arg, &tmp, 0); 294 if (*tmp) { 295 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 296 arg, info->name); 297 return EINVAL; 298 } 299 switch (info->size) { 300 case 4: 301 ptr32 = (__s32 *) info->ptr; 302 *ptr32 = num; 303 break; 304 case 2: 305 ptr16 = (__s16 *) info->ptr; 306 *ptr16 = num; 307 break; 308 case 1: 309 ptr8 = (__s8 *) info->ptr; 310 *ptr8 = num; 311 break; 312 } 313 return 0; 314} 315 316static errcode_t parse_string(struct field_set_info *info, char *arg) 317{ 318 char *cp = (char *) info->ptr; 319 320 if (strlen(arg) >= info->size) { 321 fprintf(stderr, "Error maximum size for %s is %d.\n", 322 info->name, info->size); 323 return EINVAL; 324 } 325 strcpy(cp, arg); 326 return 0; 327} 328 329static errcode_t parse_time(struct field_set_info *info, char *arg) 330{ 331 time_t t; 332 __u32 *ptr32; 333 334 ptr32 = (__u32 *) info->ptr; 335 336 t = string_to_time(arg); 337 338 if (t == ((time_t) -1)) { 339 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 340 arg, info->name); 341 return EINVAL; 342 } 343 *ptr32 = t; 344 return 0; 345} 346 347static errcode_t parse_uuid(struct field_set_info *info, char *arg) 348{ 349 unsigned char * p = (unsigned char *) info->ptr; 350 351 if ((strcasecmp(arg, "null") == 0) || 352 (strcasecmp(arg, "clear") == 0)) { 353 uuid_clear(p); 354 } else if (strcasecmp(arg, "time") == 0) { 355 uuid_generate_time(p); 356 } else if (strcasecmp(arg, "random") == 0) { 357 uuid_generate(p); 358 } else if (uuid_parse(arg, p)) { 359 fprintf(stderr, "Invalid UUID format: %s\n", arg); 360 return EINVAL; 361 } 362 return 0; 363} 364 365static errcode_t parse_hashalg(struct field_set_info *info, char *arg) 366{ 367 int hashv; 368 unsigned char *p = (unsigned char *) info->ptr; 369 370 hashv = e2p_string2hash(arg); 371 if (hashv < 0) { 372 fprintf(stderr, "Invalid hash algorithm: %s\n", arg); 373 return EINVAL; 374 } 375 *p = hashv; 376 return 0; 377} 378 379static errcode_t parse_bmap(struct field_set_info *info, char *arg) 380{ 381 unsigned long num; 382 blk_t blk; 383 errcode_t retval; 384 char *tmp; 385 386 num = strtoul(arg, &tmp, 0); 387 if (*tmp) { 388 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 389 arg, info->name); 390 return EINVAL; 391 } 392 blk = num; 393 394 retval = ext2fs_bmap(current_fs, set_ino, &set_inode, 0, BMAP_SET, 395 array_idx, &blk); 396 if (retval) { 397 com_err("set_inode", retval, "while setting block map"); 398 } 399 return retval; 400} 401 402 403static void print_possible_fields(struct field_set_info *fields) 404{ 405 struct field_set_info *ss; 406 const char *type, *cmd; 407 FILE *f; 408 char name[40], idx[40]; 409 410 if (fields == super_fields) { 411 type = "Superblock"; 412 cmd = "set_super_value"; 413 } else if (fields == inode_fields) { 414 type = "Inode"; 415 cmd = "set_inode"; 416 } else { 417 type = "Block group descriptor"; 418 cmd = "set_block_group"; 419 } 420 f = open_pager(); 421 422 fprintf(f, "%s fields supported by the %s command:\n", type, cmd); 423 424 for (ss = fields ; ss->name ; ss++) { 425 type = "unknown"; 426 if (ss->func == parse_string) 427 type = "string"; 428 else if (ss->func == parse_int) 429 type = "integer"; 430 else if (ss->func == parse_uint) 431 type = "unsigned integer"; 432 else if (ss->func == parse_uuid) 433 type = "UUID"; 434 else if (ss->func == parse_hashalg) 435 type = "hash algorithm"; 436 else if (ss->func == parse_time) 437 type = "date/time"; 438 else if (ss->func == parse_bmap) 439 type = "set physical->logical block map"; 440 strcpy(name, ss->name); 441 if (ss->flags & FLAG_ARRAY) { 442 if (ss->max_idx > 0) 443 sprintf(idx, "[%d]", ss->max_idx); 444 else 445 strcpy(idx, "[]"); 446 strcat(name, idx); 447 } 448 fprintf(f, "\t%-20s\t%s\n", name, type); 449 } 450 close_pager(f); 451} 452 453 454void do_set_super(int argc, char *argv[]) 455{ 456 const char *usage = "<field> <value>\n" 457 "\t\"set_super_value -l\" will list the names of " 458 "superblock fields\n\twhich can be set."; 459 static struct field_set_info *ss; 460 461 if ((argc == 2) && !strcmp(argv[1], "-l")) { 462 print_possible_fields(super_fields); 463 return; 464 } 465 466 if (common_args_process(argc, argv, 3, 3, "set_super_value", 467 usage, CHECK_FS_RW)) 468 return; 469 470 if ((ss = find_field(super_fields, argv[1])) == 0) { 471 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); 472 return; 473 } 474 set_sb = *current_fs->super; 475 if (ss->func(ss, argv[2]) == 0) { 476 *current_fs->super = set_sb; 477 ext2fs_mark_super_dirty(current_fs); 478 } 479} 480 481void do_set_inode(int argc, char *argv[]) 482{ 483 const char *usage = "<inode> <field> <value>\n" 484 "\t\"set_inode_field -l\" will list the names of " 485 "the fields in an ext2 inode\n\twhich can be set."; 486 static struct field_set_info *ss; 487 488 if ((argc == 2) && !strcmp(argv[1], "-l")) { 489 print_possible_fields(inode_fields); 490 return; 491 } 492 493 if (common_args_process(argc, argv, 4, 4, "set_inode", 494 usage, CHECK_FS_RW)) 495 return; 496 497 if ((ss = find_field(inode_fields, argv[2])) == 0) { 498 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 499 return; 500 } 501 502 set_ino = string_to_inode(argv[1]); 503 if (!set_ino) 504 return; 505 506 if (debugfs_read_inode(set_ino, &set_inode, argv[1])) 507 return; 508 509 if (ss->func(ss, argv[3]) == 0) { 510 if (debugfs_write_inode(set_ino, &set_inode, argv[1])) 511 return; 512 } 513} 514 515void do_set_block_group_descriptor(int argc, char *argv[]) 516{ 517 const char *usage = "<bg number> <field> <value>\n" 518 "\t\"set_block_group_descriptor -l\" will list the names of " 519 "the fields in a block group descriptor\n\twhich can be set."; 520 struct field_set_info *ss; 521 dgrp_t set_bg; 522 char *end; 523 524 if ((argc == 2) && !strcmp(argv[1], "-l")) { 525 print_possible_fields(ext2_bg_fields); 526 return; 527 } 528 529 if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor", 530 usage, CHECK_FS_RW)) 531 return; 532 533 set_bg = strtoul(argv[1], &end, 0); 534 if (*end) { 535 com_err(argv[0], 0, "invalid block group number: %s", argv[1]); 536 return; 537 } 538 539 if (set_bg >= current_fs->group_desc_count) { 540 com_err(argv[0], 0, "block group number too big: %d", set_bg); 541 return; 542 } 543 544 545 if ((ss = find_field(ext2_bg_fields, argv[2])) == 0) { 546 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 547 return; 548 } 549 550 set_gd = current_fs->group_desc[set_bg]; 551 552 if (ss->func(ss, argv[3]) == 0) { 553 current_fs->group_desc[set_bg] = set_gd; 554 ext2fs_mark_super_dirty(current_fs); 555 } 556} 557