set_fields.c revision fef2b38d8e5b475655771f8208265a8fa9246601
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 500 /* for inclusion of strptime() */ 13 14#include <stdio.h> 15#include <unistd.h> 16#include <stdlib.h> 17#include <ctype.h> 18#include <string.h> 19#include <strings.h> 20#include <time.h> 21#include <sys/types.h> 22#include <sys/stat.h> 23#ifdef HAVE_ERRNO_H 24#include <errno.h> 25#endif 26#if HAVE_STRINGS_H 27#include <strings.h> 28#endif 29#include <fcntl.h> 30#include <utime.h> 31 32#include "debugfs.h" 33#include "uuid/uuid.h" 34#include "e2p/e2p.h" 35 36static struct ext2_super_block set_sb; 37static struct ext2_inode set_inode; 38static struct ext2_group_desc set_gd; 39static ext2_ino_t set_ino; 40static int array_idx; 41 42#define FLAG_ARRAY 0x0001 43 44struct field_set_info { 45 const char *name; 46 void *ptr; 47 unsigned int size; 48 errcode_t (*func)(struct field_set_info *info, char *arg); 49 int flags; 50 int max_idx; 51}; 52 53static errcode_t parse_uint(struct field_set_info *info, char *arg); 54static errcode_t parse_int(struct field_set_info *info, char *arg); 55static errcode_t parse_string(struct field_set_info *info, char *arg); 56static errcode_t parse_uuid(struct field_set_info *info, char *arg); 57static errcode_t parse_hashalg(struct field_set_info *info, char *arg); 58static errcode_t parse_time(struct field_set_info *info, char *arg); 59static errcode_t parse_bmap(struct field_set_info *info, char *arg); 60 61static struct field_set_info super_fields[] = { 62 { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint }, 63 { "blocks_count", &set_sb.s_blocks_count, 4, parse_uint }, 64 { "r_blocks_count", &set_sb.s_r_blocks_count, 4, parse_uint }, 65 { "free_blocks_count", &set_sb.s_free_blocks_count, 4, parse_uint }, 66 { "free_inodes_count", &set_sb.s_free_inodes_count, 4, parse_uint }, 67 { "first_data_block", &set_sb.s_first_data_block, 4, parse_uint }, 68 { "log_block_size", &set_sb.s_log_block_size, 4, parse_uint }, 69 { "log_frag_size", &set_sb.s_log_frag_size, 4, parse_int }, 70 { "blocks_per_group", &set_sb.s_blocks_per_group, 4, parse_uint }, 71 { "frags_per_group", &set_sb.s_frags_per_group, 4, parse_uint }, 72 { "inodes_per_group", &set_sb.s_inodes_per_group, 4, parse_uint }, 73 { "mtime", &set_sb.s_mtime, 4, parse_time }, 74 { "wtime", &set_sb.s_wtime, 4, parse_time }, 75 { "mnt_count", &set_sb.s_mnt_count, 2, parse_uint }, 76 { "max_mnt_count", &set_sb.s_max_mnt_count, 2, parse_int }, 77 /* s_magic */ 78 { "state", &set_sb.s_state, 2, parse_uint }, 79 { "errors", &set_sb.s_errors, 2, parse_uint }, 80 { "minor_rev_level", &set_sb.s_minor_rev_level, 2, parse_uint }, 81 { "lastcheck", &set_sb.s_lastcheck, 4, parse_time }, 82 { "checkinterval", &set_sb.s_checkinterval, 4, parse_uint }, 83 { "creator_os", &set_sb.s_creator_os, 4, parse_uint }, 84 { "rev_level", &set_sb.s_rev_level, 4, parse_uint }, 85 { "def_resuid", &set_sb.s_def_resuid, 2, parse_uint }, 86 { "def_resgid", &set_sb.s_def_resgid, 2, parse_uint }, 87 { "first_ino", &set_sb.s_first_ino, 4, parse_uint }, 88 { "inode_size", &set_sb.s_inode_size, 2, parse_uint }, 89 { "block_group_nr", &set_sb.s_block_group_nr, 2, parse_uint }, 90 { "feature_compat", &set_sb.s_feature_compat, 4, parse_uint }, 91 { "feature_incompat", &set_sb.s_feature_incompat, 4, parse_uint }, 92 { "feature_ro_compat", &set_sb.s_feature_ro_compat, 4, parse_uint }, 93 { "uuid", &set_sb.s_uuid, 16, parse_uuid }, 94 { "volume_name", &set_sb.s_volume_name, 16, parse_string }, 95 { "last_mounted", &set_sb.s_last_mounted, 64, parse_string }, 96 { "lastcheck", &set_sb.s_lastcheck, 4, parse_uint }, 97 { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, 98 4, parse_uint }, 99 { "prealloc_blocks", &set_sb.s_prealloc_blocks, 1, parse_uint }, 100 { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, 1, 101 parse_uint }, 102 { "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, 2, 103 parse_uint }, 104 /* s_padding1 */ 105 { "journal_uuid", &set_sb.s_journal_uuid, 16, parse_uuid }, 106 { "journal_inum", &set_sb.s_journal_inum, 4, parse_uint }, 107 { "journal_dev", &set_sb.s_journal_dev, 4, parse_uint }, 108 { "last_orphan", &set_sb.s_last_orphan, 4, parse_uint }, 109 { "hash_seed", &set_sb.s_hash_seed, 16, parse_uuid }, 110 { "def_hash_version", &set_sb.s_def_hash_version, 1, parse_hashalg }, 111 { "jnl_backup_type", &set_sb.s_jnl_backup_type, 1, parse_uint }, 112 /* s_reserved_word_pad */ 113 { "default_mount_opts", &set_sb.s_default_mount_opts, 4, parse_uint }, 114 { "first_meta_bg", &set_sb.s_first_meta_bg, 4, parse_uint }, 115 { "mkfs_time", &set_sb.s_mkfs_time, 4, parse_time }, 116 { "jnl_blocks", &set_sb.s_jnl_blocks[0], 4, parse_uint, FLAG_ARRAY, 117 17 }, 118 { "flags", &set_sb.s_flags, 4, parse_uint }, 119 { 0, 0, 0, 0 } 120}; 121 122static struct field_set_info inode_fields[] = { 123 { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint }, 124 { "mode", &set_inode.i_mode, 2, parse_uint }, 125 { "uid", &set_inode.i_uid, 2, parse_uint }, 126 { "size", &set_inode.i_size, 4, parse_uint }, 127 { "atime", &set_inode.i_atime, 4, parse_time }, 128 { "ctime", &set_inode.i_ctime, 4, parse_time }, 129 { "mtime", &set_inode.i_mtime, 4, parse_time }, 130 { "dtime", &set_inode.i_dtime, 4, parse_time }, 131 { "gid", &set_inode.i_gid, 2, parse_uint }, 132 { "links_count", &set_inode.i_links_count, 2, parse_uint }, 133 { "blocks", &set_inode.i_blocks, 4, parse_uint }, 134 { "flags", &set_inode.i_flags, 4, parse_uint }, 135 { "version", &set_inode.osd1.linux1.l_i_version, 4, parse_uint }, 136 { "translator", &set_inode.osd1.hurd1.h_i_translator, 4, parse_uint }, 137 { "block", &set_inode.i_block[0], 4, parse_uint, FLAG_ARRAY, 138 EXT2_NDIR_BLOCKS }, 139 { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], 4, parse_uint }, 140 { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], 4, parse_uint }, 141 { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], 4, parse_uint }, 142 { "generation", &set_inode.i_generation, 4, parse_uint }, 143 { "file_acl", &set_inode.i_file_acl, 4, parse_uint }, 144 { "dir_acl", &set_inode.i_dir_acl, 4, parse_uint }, 145 { "faddr", &set_inode.i_faddr, 4, parse_uint }, 146 { "blocks_hi", &set_inode.osd2.linux2.l_i_blocks_hi, 2, parse_uint }, 147 { "frag", &set_inode.osd2.hurd2.h_i_frag, 1, parse_uint }, 148 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, 1, parse_uint }, 149 { "uid_high", &set_inode.osd2.linux2.l_i_uid_high, 2, parse_uint }, 150 { "gid_high", &set_inode.osd2.linux2.l_i_gid_high, 2, parse_uint }, 151 { "author", &set_inode.osd2.hurd2.h_i_author, 4, parse_uint }, 152 { "bmap", NULL, 4, parse_bmap, FLAG_ARRAY }, 153 { 0, 0, 0, 0 } 154}; 155 156static struct field_set_info ext2_bg_fields[] = { 157 { "block_bitmap", &set_gd.bg_block_bitmap, 4, parse_uint }, 158 { "inode_bitmap", &set_gd.bg_inode_bitmap, 4, parse_uint }, 159 { "inode_table", &set_gd.bg_inode_table, 4, parse_uint }, 160 { "free_blocks_count", &set_gd.bg_free_blocks_count, 2, parse_uint }, 161 { "free_inodes_count", &set_gd.bg_free_inodes_count, 2, parse_uint }, 162 { "used_dirs_count", &set_gd.bg_used_dirs_count, 2, parse_uint }, 163 { "flags", &set_gd.bg_flags, 2, parse_uint }, 164 { "reserved", &set_gd.bg_reserved, 2, parse_uint, FLAG_ARRAY, 2 }, 165 { "itable_unused", &set_gd.bg_itable_unused, 2, parse_uint }, 166 { "checksum", &set_gd.bg_checksum, 2, parse_uint }, 167 { 0, 0, 0, 0 } 168}; 169 170 171static struct field_set_info *find_field(struct field_set_info *fields, 172 char *field) 173{ 174 struct field_set_info *ss; 175 const char *prefix; 176 char *arg, *delim, *idx, *tmp; 177 int prefix_len; 178 179 if (fields == super_fields) 180 prefix = "s_"; 181 else if (fields == inode_fields) 182 prefix = "i_"; 183 else 184 prefix = "bg_"; 185 prefix_len = strlen(prefix); 186 if (strncmp(field, prefix, prefix_len) == 0) 187 field += prefix_len; 188 189 arg = malloc(strlen(field)+1); 190 if (!arg) 191 return NULL; 192 strcpy(arg, field); 193 194 idx = strchr(arg, '['); 195 if (idx) { 196 *idx++ = 0; 197 delim = idx + strlen(idx) - 1; 198 if (!*idx || *delim != ']') 199 idx = 0; 200 else 201 *delim = 0; 202 } 203 /* 204 * Can we parse the number? 205 */ 206 if (idx) { 207 array_idx = strtol(idx, &tmp, 0); 208 if (*tmp) 209 idx = 0; 210 } 211 212 for (ss = fields ; ss->name ; ss++) { 213 if (ss->flags & FLAG_ARRAY) { 214 if (!idx || (strcmp(ss->name, arg) != 0)) 215 continue; 216 if (ss->max_idx > 0 && array_idx >= ss->max_idx) 217 continue; 218 } else { 219 if (strcmp(ss->name, field) != 0) 220 continue; 221 } 222 return ss; 223 } 224 225 return NULL; 226} 227 228static errcode_t parse_uint(struct field_set_info *info, char *arg) 229{ 230 unsigned long num; 231 char *tmp; 232 union { 233 __u32 *ptr32; 234 __u16 *ptr16; 235 __u8 *ptr8; 236 } u; 237 238 u.ptr8 = (__u8 *) info->ptr; 239 if (info->flags & FLAG_ARRAY) 240 u.ptr8 += array_idx * info->size; 241 242 num = strtoul(arg, &tmp, 0); 243 if (*tmp) { 244 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 245 arg, info->name); 246 return EINVAL; 247 } 248 switch (info->size) { 249 case 4: 250 *u.ptr32 = num; 251 break; 252 case 2: 253 *u.ptr16 = num; 254 break; 255 case 1: 256 *u.ptr8 = num; 257 break; 258 } 259 return 0; 260} 261 262static errcode_t parse_int(struct field_set_info *info, char *arg) 263{ 264 long num; 265 char *tmp; 266 __s32 *ptr32; 267 __s16 *ptr16; 268 __s8 *ptr8; 269 270 num = strtol(arg, &tmp, 0); 271 if (*tmp) { 272 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 273 arg, info->name); 274 return EINVAL; 275 } 276 switch (info->size) { 277 case 4: 278 ptr32 = (__s32 *) info->ptr; 279 *ptr32 = num; 280 break; 281 case 2: 282 ptr16 = (__s16 *) info->ptr; 283 *ptr16 = num; 284 break; 285 case 1: 286 ptr8 = (__s8 *) info->ptr; 287 *ptr8 = num; 288 break; 289 } 290 return 0; 291} 292 293static errcode_t parse_string(struct field_set_info *info, char *arg) 294{ 295 char *cp = (char *) info->ptr; 296 297 if (strlen(arg) >= info->size) { 298 fprintf(stderr, "Error maximum size for %s is %d.\n", 299 info->name, info->size); 300 return EINVAL; 301 } 302 strcpy(cp, arg); 303 return 0; 304} 305 306static errcode_t parse_time(struct field_set_info *info, char *arg) 307{ 308 time_t t; 309 __u32 *ptr32; 310 311 ptr32 = (__u32 *) info->ptr; 312 313 t = string_to_time(arg); 314 315 if (t == ((time_t) -1)) { 316 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 317 arg, info->name); 318 return EINVAL; 319 } 320 *ptr32 = t; 321 return 0; 322} 323 324static errcode_t parse_uuid(struct field_set_info *info, char *arg) 325{ 326 unsigned char * p = (unsigned char *) info->ptr; 327 328 if ((strcasecmp(arg, "null") == 0) || 329 (strcasecmp(arg, "clear") == 0)) { 330 uuid_clear(p); 331 } else if (strcasecmp(arg, "time") == 0) { 332 uuid_generate_time(p); 333 } else if (strcasecmp(arg, "random") == 0) { 334 uuid_generate(p); 335 } else if (uuid_parse(arg, p)) { 336 fprintf(stderr, "Invalid UUID format: %s\n", arg); 337 return EINVAL; 338 } 339 return 0; 340} 341 342static errcode_t parse_hashalg(struct field_set_info *info, char *arg) 343{ 344 int hashv; 345 unsigned char *p = (unsigned char *) info->ptr; 346 347 hashv = e2p_string2hash(arg); 348 if (hashv < 0) { 349 fprintf(stderr, "Invalid hash algorithm: %s\n", arg); 350 return EINVAL; 351 } 352 *p = hashv; 353 return 0; 354} 355 356static errcode_t parse_bmap(struct field_set_info *info, char *arg) 357{ 358 unsigned long num; 359 blk_t blk; 360 errcode_t retval; 361 char *tmp; 362 363 num = strtoul(arg, &tmp, 0); 364 if (*tmp) { 365 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 366 arg, info->name); 367 return EINVAL; 368 } 369 blk = num; 370 371 retval = ext2fs_bmap(current_fs, set_ino, &set_inode, 0, BMAP_SET, 372 array_idx, &blk); 373 if (retval) { 374 com_err("set_inode", retval, "while setting block map"); 375 } 376 return retval; 377} 378 379 380static void print_possible_fields(struct field_set_info *fields) 381{ 382 struct field_set_info *ss; 383 const char *type, *cmd; 384 FILE *f; 385 char name[40], idx[40]; 386 387 if (fields == super_fields) { 388 type = "Superblock"; 389 cmd = "set_super_value"; 390 } else if (fields == inode_fields) { 391 type = "Inode"; 392 cmd = "set_inode"; 393 } else { 394 type = "Block group descriptor"; 395 cmd = "set_block_group"; 396 } 397 f = open_pager(); 398 399 fprintf(f, "%s fields supported by the %s command:\n", type, cmd); 400 401 for (ss = fields ; ss->name ; ss++) { 402 type = "unknown"; 403 if (ss->func == parse_string) 404 type = "string"; 405 else if (ss->func == parse_int) 406 type = "integer"; 407 else if (ss->func == parse_uint) 408 type = "unsigned integer"; 409 else if (ss->func == parse_uuid) 410 type = "UUID"; 411 else if (ss->func == parse_hashalg) 412 type = "hash algorithm"; 413 else if (ss->func == parse_time) 414 type = "date/time"; 415 else if (ss->func == parse_bmap) 416 type = "set physical->logical block map"; 417 strcpy(name, ss->name); 418 if (ss->flags & FLAG_ARRAY) { 419 if (ss->max_idx > 0) 420 sprintf(idx, "[%d]", ss->max_idx); 421 else 422 strcpy(idx, "[]"); 423 strcat(name, idx); 424 } 425 fprintf(f, "\t%-20s\t%s\n", name, type); 426 } 427 close_pager(f); 428} 429 430 431void do_set_super(int argc, char *argv[]) 432{ 433 const char *usage = "<field> <value>\n" 434 "\t\"set_super_value -l\" will list the names of " 435 "superblock fields\n\twhich can be set."; 436 static struct field_set_info *ss; 437 438 if ((argc == 2) && !strcmp(argv[1], "-l")) { 439 print_possible_fields(super_fields); 440 return; 441 } 442 443 if (common_args_process(argc, argv, 3, 3, "set_super_value", 444 usage, CHECK_FS_RW)) 445 return; 446 447 if ((ss = find_field(super_fields, argv[1])) == 0) { 448 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); 449 return; 450 } 451 set_sb = *current_fs->super; 452 if (ss->func(ss, argv[2]) == 0) { 453 *current_fs->super = set_sb; 454 ext2fs_mark_super_dirty(current_fs); 455 } 456} 457 458void do_set_inode(int argc, char *argv[]) 459{ 460 const char *usage = "<inode> <field> <value>\n" 461 "\t\"set_inode_field -l\" will list the names of " 462 "the fields in an ext2 inode\n\twhich can be set."; 463 static struct field_set_info *ss; 464 465 if ((argc == 2) && !strcmp(argv[1], "-l")) { 466 print_possible_fields(inode_fields); 467 return; 468 } 469 470 if (common_args_process(argc, argv, 4, 4, "set_inode", 471 usage, CHECK_FS_RW)) 472 return; 473 474 if ((ss = find_field(inode_fields, argv[2])) == 0) { 475 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 476 return; 477 } 478 479 set_ino = string_to_inode(argv[1]); 480 if (!set_ino) 481 return; 482 483 if (debugfs_read_inode(set_ino, &set_inode, argv[1])) 484 return; 485 486 if (ss->func(ss, argv[3]) == 0) { 487 if (debugfs_write_inode(set_ino, &set_inode, argv[1])) 488 return; 489 } 490} 491 492void do_set_block_group_descriptor(int argc, char *argv[]) 493{ 494 const char *usage = "<bg number> <field> <value>\n" 495 "\t\"set_block_group_descriptor -l\" will list the names of " 496 "the fields in a block group descriptor\n\twhich can be set."; 497 struct field_set_info *ss; 498 dgrp_t set_bg; 499 char *end; 500 501 if ((argc == 2) && !strcmp(argv[1], "-l")) { 502 print_possible_fields(ext2_bg_fields); 503 return; 504 } 505 506 if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor", 507 usage, CHECK_FS_RW)) 508 return; 509 510 set_bg = strtoul(argv[1], &end, 0); 511 if (*end) { 512 com_err(argv[0], 0, "invalid block group number: %s", argv[1]); 513 return; 514 } 515 516 if (set_bg >= current_fs->group_desc_count) { 517 com_err(argv[0], 0, "block group number too big: %d", set_bg); 518 return; 519 } 520 521 522 if ((ss = find_field(ext2_bg_fields, argv[2])) == 0) { 523 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 524 return; 525 } 526 527 set_gd = current_fs->group_desc[set_bg]; 528 529 if (ss->func(ss, argv[3]) == 0) { 530 current_fs->group_desc[set_bg] = set_gd; 531 ext2fs_mark_super_dirty(current_fs); 532 } 533} 534