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 42 static struct ext2_super_block set_sb; 43 static struct ext2_inode_large set_inode; 44 static struct ext2_group_desc set_gd; 45 static struct ext4_group_desc set_gd4; 46 static struct mmp_struct set_mmp; 47 static dgrp_t set_bg; 48 static ext2_ino_t set_ino; 49 static int array_idx; 50 51 #define FLAG_ARRAY 0x0001 52 53 struct field_set_info { 54 const char *name; 55 void *ptr; 56 void *ptr2; 57 unsigned int size; 58 errcode_t (*func)(struct field_set_info *info, char *field, char *arg); 59 int flags; 60 int max_idx; 61 }; 62 63 static errcode_t parse_uint(struct field_set_info *info, char *field, char *arg); 64 static errcode_t parse_int(struct field_set_info *info, char *field, char *arg); 65 static errcode_t parse_string(struct field_set_info *info, char *field, char *arg); 66 static errcode_t parse_uuid(struct field_set_info *info, char *field, char *arg); 67 static errcode_t parse_hashalg(struct field_set_info *info, char *field, char *arg); 68 static errcode_t parse_time(struct field_set_info *info, char *field, char *arg); 69 static errcode_t parse_bmap(struct field_set_info *info, char *field, char *arg); 70 static errcode_t parse_gd_csum(struct field_set_info *info, char *field, char *arg); 71 static errcode_t parse_mmp_clear(struct field_set_info *info, char *field, 72 char *arg); 73 74 static struct field_set_info super_fields[] = { 75 { "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint }, 76 { "blocks_count", &set_sb.s_blocks_count, &set_sb.s_blocks_count_hi, 77 4, parse_uint }, 78 { "r_blocks_count", &set_sb.s_r_blocks_count, 79 &set_sb.s_r_blocks_count_hi, 4, parse_uint }, 80 { "free_blocks_count", &set_sb.s_free_blocks_count, 81 &set_sb.s_free_blocks_hi, 4, parse_uint }, 82 { "free_inodes_count", &set_sb.s_free_inodes_count, NULL, 4, parse_uint }, 83 { "first_data_block", &set_sb.s_first_data_block, NULL, 4, parse_uint }, 84 { "log_block_size", &set_sb.s_log_block_size, NULL, 4, parse_uint }, 85 { "log_cluster_size", &set_sb.s_log_cluster_size, NULL, 4, parse_int }, 86 { "blocks_per_group", &set_sb.s_blocks_per_group, NULL, 4, parse_uint }, 87 { "clusters_per_group", &set_sb.s_clusters_per_group, NULL, 4, parse_uint }, 88 { "inodes_per_group", &set_sb.s_inodes_per_group, NULL, 4, parse_uint }, 89 { "mtime", &set_sb.s_mtime, NULL, 4, parse_time }, 90 { "wtime", &set_sb.s_wtime, NULL, 4, parse_time }, 91 { "mnt_count", &set_sb.s_mnt_count, NULL, 2, parse_uint }, 92 { "max_mnt_count", &set_sb.s_max_mnt_count, NULL, 2, parse_int }, 93 /* s_magic */ 94 { "state", &set_sb.s_state, NULL, 2, parse_uint }, 95 { "errors", &set_sb.s_errors, NULL, 2, parse_uint }, 96 { "minor_rev_level", &set_sb.s_minor_rev_level, NULL, 2, parse_uint }, 97 { "lastcheck", &set_sb.s_lastcheck, NULL, 4, parse_time }, 98 { "checkinterval", &set_sb.s_checkinterval, NULL, 4, parse_uint }, 99 { "creator_os", &set_sb.s_creator_os, NULL, 4, parse_uint }, 100 { "rev_level", &set_sb.s_rev_level, NULL, 4, parse_uint }, 101 { "def_resuid", &set_sb.s_def_resuid, NULL, 2, parse_uint }, 102 { "def_resgid", &set_sb.s_def_resgid, NULL, 2, parse_uint }, 103 { "first_ino", &set_sb.s_first_ino, NULL, 4, parse_uint }, 104 { "inode_size", &set_sb.s_inode_size, NULL, 2, parse_uint }, 105 { "block_group_nr", &set_sb.s_block_group_nr, NULL, 2, parse_uint }, 106 { "feature_compat", &set_sb.s_feature_compat, NULL, 4, parse_uint }, 107 { "feature_incompat", &set_sb.s_feature_incompat, NULL, 4, parse_uint }, 108 { "feature_ro_compat", &set_sb.s_feature_ro_compat, NULL, 4, parse_uint }, 109 { "uuid", &set_sb.s_uuid, NULL, 16, parse_uuid }, 110 { "volume_name", &set_sb.s_volume_name, NULL, 16, parse_string }, 111 { "last_mounted", &set_sb.s_last_mounted, NULL, 64, parse_string }, 112 { "lastcheck", &set_sb.s_lastcheck, NULL, 4, parse_uint }, 113 { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, NULL, 114 4, parse_uint }, 115 { "prealloc_blocks", &set_sb.s_prealloc_blocks, NULL, 1, parse_uint }, 116 { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, NULL, 1, 117 parse_uint }, 118 { "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, NULL, 2, 119 parse_uint }, 120 { "journal_uuid", &set_sb.s_journal_uuid, NULL, 16, parse_uuid }, 121 { "journal_inum", &set_sb.s_journal_inum, NULL, 4, parse_uint }, 122 { "journal_dev", &set_sb.s_journal_dev, NULL, 4, parse_uint }, 123 { "last_orphan", &set_sb.s_last_orphan, NULL, 4, parse_uint }, 124 { "hash_seed", &set_sb.s_hash_seed, NULL, 16, parse_uuid }, 125 { "def_hash_version", &set_sb.s_def_hash_version, NULL, 1, parse_hashalg }, 126 { "jnl_backup_type", &set_sb.s_jnl_backup_type, NULL, 1, parse_uint }, 127 { "desc_size", &set_sb.s_desc_size, NULL, 2, parse_uint }, 128 { "default_mount_opts", &set_sb.s_default_mount_opts, NULL, 4, parse_uint }, 129 { "first_meta_bg", &set_sb.s_first_meta_bg, NULL, 4, parse_uint }, 130 { "mkfs_time", &set_sb.s_mkfs_time, NULL, 4, parse_time }, 131 { "jnl_blocks", &set_sb.s_jnl_blocks[0], NULL, 4, parse_uint, FLAG_ARRAY, 132 17 }, 133 { "min_extra_isize", &set_sb.s_min_extra_isize, NULL, 2, parse_uint }, 134 { "want_extra_isize", &set_sb.s_want_extra_isize, NULL, 2, parse_uint }, 135 { "flags", &set_sb.s_flags, NULL, 4, parse_uint }, 136 { "raid_stride", &set_sb.s_raid_stride, NULL, 2, parse_uint }, 137 { "min_extra_isize", &set_sb.s_min_extra_isize, NULL, 4, parse_uint }, 138 { "mmp_interval", &set_sb.s_mmp_update_interval, NULL, 2, parse_uint }, 139 { "mmp_block", &set_sb.s_mmp_block, NULL, 8, parse_uint }, 140 { "raid_stripe_width", &set_sb.s_raid_stripe_width, NULL, 4, parse_uint }, 141 { "log_groups_per_flex", &set_sb.s_log_groups_per_flex, NULL, 1, parse_uint }, 142 { "kbytes_written", &set_sb.s_kbytes_written, NULL, 8, parse_uint }, 143 { "snapshot_inum", &set_sb.s_snapshot_inum, NULL, 4, parse_uint }, 144 { "snapshot_id", &set_sb.s_snapshot_id, NULL, 4, parse_uint }, 145 { "snapshot_r_blocks_count", &set_sb.s_snapshot_r_blocks_count, 146 NULL, 8, parse_uint }, 147 { "snapshot_list", &set_sb.s_snapshot_list, NULL, 4, parse_uint }, 148 { "mount_opts", &set_sb.s_mount_opts, NULL, 64, parse_string }, 149 { "usr_quota_inum", &set_sb.s_usr_quota_inum, NULL, 4, parse_uint }, 150 { "grp_quota_inum", &set_sb.s_grp_quota_inum, NULL, 4, parse_uint }, 151 { "overhead_blocks", &set_sb.s_overhead_blocks, NULL, 4, parse_uint }, 152 { "checksum", &set_sb.s_checksum, NULL, 4, parse_uint }, 153 { 0, 0, 0, 0 } 154 }; 155 156 static struct field_set_info inode_fields[] = { 157 { "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint }, 158 { "mode", &set_inode.i_mode, NULL, 2, parse_uint }, 159 { "uid", &set_inode.i_uid, &set_inode.osd2.linux2.l_i_uid_high, 160 2, parse_uint }, 161 { "size", &set_inode.i_size, &set_inode.i_size_high, 4, parse_uint }, 162 { "atime", &set_inode.i_atime, NULL, 4, parse_time }, 163 { "ctime", &set_inode.i_ctime, NULL, 4, parse_time }, 164 { "mtime", &set_inode.i_mtime, NULL, 4, parse_time }, 165 { "dtime", &set_inode.i_dtime, NULL, 4, parse_time }, 166 { "gid", &set_inode.i_gid, &set_inode.osd2.linux2.l_i_gid_high, 167 2, parse_uint }, 168 { "links_count", &set_inode.i_links_count, NULL, 2, parse_uint }, 169 /* Special case: i_blocks is 4 bytes, i_blocks_high is 2 bytes */ 170 { "blocks", &set_inode.i_blocks, &set_inode.osd2.linux2.l_i_blocks_hi, 171 6, parse_uint }, 172 { "flags", &set_inode.i_flags, NULL, 4, parse_uint }, 173 { "version", &set_inode.osd1.linux1.l_i_version, 174 &set_inode.i_version_hi, 4, parse_uint }, 175 { "translator", &set_inode.osd1.hurd1.h_i_translator, NULL, 4, parse_uint }, 176 { "block", &set_inode.i_block[0], NULL, 4, parse_uint, FLAG_ARRAY, 177 EXT2_NDIR_BLOCKS }, 178 { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], NULL, 4, parse_uint }, 179 { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], NULL, 4, parse_uint }, 180 { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], NULL, 4, parse_uint }, 181 { "generation", &set_inode.i_generation, NULL, 4, parse_uint }, 182 /* Special case: i_file_acl_high is 2 bytes */ 183 { "file_acl", &set_inode.i_file_acl, 184 &set_inode.osd2.linux2.l_i_file_acl_high, 6, parse_uint }, 185 { "dir_acl", &set_inode.i_dir_acl, NULL, 4, parse_uint }, 186 { "faddr", &set_inode.i_faddr, NULL, 4, parse_uint }, 187 { "frag", &set_inode.osd2.hurd2.h_i_frag, NULL, 1, parse_uint }, 188 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, NULL, 1, parse_uint }, 189 { "checksum", &set_inode.osd2.linux2.l_i_checksum_lo, 190 &set_inode.i_checksum_hi, 2, parse_uint }, 191 { "author", &set_inode.osd2.hurd2.h_i_author, NULL, 192 4, parse_uint }, 193 { "extra_isize", &set_inode.i_extra_isize, NULL, 194 2, parse_uint }, 195 { "ctime_extra", &set_inode.i_ctime_extra, NULL, 196 4, parse_uint }, 197 { "mtime_extra", &set_inode.i_mtime_extra, NULL, 198 4, parse_uint }, 199 { "atime_extra", &set_inode.i_atime_extra, NULL, 200 4, parse_uint }, 201 { "crtime", &set_inode.i_crtime, NULL, 4, parse_uint }, 202 { "crtime_extra", &set_inode.i_crtime_extra, NULL, 203 4, parse_uint }, 204 { "bmap", NULL, NULL, 4, parse_bmap, FLAG_ARRAY }, 205 { 0, 0, 0, 0 } 206 }; 207 208 static struct field_set_info ext2_bg_fields[] = { 209 { "block_bitmap", &set_gd.bg_block_bitmap, NULL, 4, parse_uint }, 210 { "inode_bitmap", &set_gd.bg_inode_bitmap, NULL, 4, parse_uint }, 211 { "inode_table", &set_gd.bg_inode_table, NULL, 4, parse_uint }, 212 { "free_blocks_count", &set_gd.bg_free_blocks_count, NULL, 2, parse_uint }, 213 { "free_inodes_count", &set_gd.bg_free_inodes_count, NULL, 2, parse_uint }, 214 { "used_dirs_count", &set_gd.bg_used_dirs_count, NULL, 2, parse_uint }, 215 { "flags", &set_gd.bg_flags, NULL, 2, parse_uint }, 216 { "itable_unused", &set_gd.bg_itable_unused, NULL, 2, parse_uint }, 217 { "checksum", &set_gd.bg_checksum, NULL, 2, parse_gd_csum }, 218 { 0, 0, 0, 0 } 219 }; 220 221 static struct field_set_info ext4_bg_fields[] = { 222 { "block_bitmap", &set_gd4.bg_block_bitmap, 223 &set_gd4.bg_block_bitmap_hi, 4, parse_uint }, 224 { "inode_bitmap", &set_gd4.bg_inode_bitmap, 225 &set_gd4.bg_inode_bitmap_hi, 4, parse_uint }, 226 { "inode_table", &set_gd4.bg_inode_table, 227 &set_gd4.bg_inode_table_hi, 4, parse_uint }, 228 { "free_blocks_count", &set_gd4.bg_free_blocks_count, 229 &set_gd4.bg_free_blocks_count_hi, 2, parse_uint }, 230 { "free_inodes_count", &set_gd4.bg_free_inodes_count, 231 &set_gd4.bg_free_inodes_count_hi, 2, parse_uint }, 232 { "used_dirs_count", &set_gd4.bg_used_dirs_count, 233 &set_gd4.bg_used_dirs_count_hi, 2, parse_uint }, 234 { "flags", &set_gd4.bg_flags, NULL, 2, parse_uint }, 235 { "exclude_bitmap", &set_gd4.bg_exclude_bitmap_lo, 236 &set_gd4.bg_exclude_bitmap_hi, 4, parse_uint }, 237 { "block_bitmap_csum", &set_gd4.bg_block_bitmap_csum_lo, 238 &set_gd4.bg_block_bitmap_csum_hi, 2, parse_uint }, 239 { "inode_bitmap_csum", &set_gd4.bg_inode_bitmap_csum_lo, 240 &set_gd4.bg_inode_bitmap_csum_hi, 2, parse_uint }, 241 { "itable_unused", &set_gd4.bg_itable_unused, 242 &set_gd4.bg_itable_unused_hi, 2, parse_uint }, 243 { "checksum", &set_gd4.bg_checksum, NULL, 2, parse_gd_csum }, 244 { 0, 0, 0, 0 } 245 }; 246 247 static struct field_set_info mmp_fields[] = { 248 { "clear", &set_mmp.mmp_magic, NULL, sizeof(set_mmp), parse_mmp_clear }, 249 { "magic", &set_mmp.mmp_magic, NULL, 4, parse_uint }, 250 { "seq", &set_mmp.mmp_seq, NULL, 4, parse_uint }, 251 { "time", &set_mmp.mmp_time, NULL, 8, parse_uint }, 252 { "nodename", &set_mmp.mmp_nodename, NULL, sizeof(set_mmp.mmp_nodename), 253 parse_string }, 254 { "bdevname", &set_mmp.mmp_bdevname, NULL, sizeof(set_mmp.mmp_bdevname), 255 parse_string }, 256 { "check_interval", &set_mmp.mmp_check_interval, NULL, 2, parse_uint }, 257 }; 258 259 static int check_suffix(const char *field) 260 { 261 int len = strlen(field); 262 263 if (len <= 3) 264 return 0; 265 field += len-3; 266 if (!strcmp(field, "_lo")) 267 return 1; 268 if (!strcmp(field, "_hi")) 269 return 2; 270 return 0; 271 } 272 273 static struct field_set_info *find_field(struct field_set_info *fields, 274 char *field) 275 { 276 struct field_set_info *ss; 277 const char *prefix; 278 char *arg, *delim, *idx, *tmp; 279 int suffix, prefix_len; 280 281 if (fields == super_fields) 282 prefix = "s_"; 283 else if (fields == inode_fields) 284 prefix = "i_"; 285 else 286 prefix = "bg_"; 287 prefix_len = strlen(prefix); 288 if (strncmp(field, prefix, prefix_len) == 0) 289 field += prefix_len; 290 291 arg = malloc(strlen(field)+1); 292 if (!arg) 293 return NULL; 294 strcpy(arg, field); 295 296 idx = strchr(arg, '['); 297 if (idx) { 298 *idx++ = 0; 299 delim = idx + strlen(idx) - 1; 300 if (!*idx || *delim != ']') 301 idx = 0; 302 else 303 *delim = 0; 304 } 305 /* 306 * Can we parse the number? 307 */ 308 if (idx) { 309 array_idx = strtol(idx, &tmp, 0); 310 if (*tmp) 311 idx = 0; 312 } 313 314 /* 315 * If there is a valid _hi or a _lo suffix, strip it off 316 */ 317 suffix = check_suffix(arg); 318 if (suffix > 0) 319 arg[strlen(arg)-3] = 0; 320 321 for (ss = fields ; ss->name ; ss++) { 322 if (suffix && ss->ptr2 == 0) 323 continue; 324 if (ss->flags & FLAG_ARRAY) { 325 if (!idx || (strcmp(ss->name, arg) != 0)) 326 continue; 327 if (ss->max_idx > 0 && array_idx >= ss->max_idx) 328 continue; 329 } else { 330 if (strcmp(ss->name, arg) != 0) 331 continue; 332 } 333 free(arg); 334 return ss; 335 } 336 free(arg); 337 return NULL; 338 } 339 340 /* 341 * Note: info->size == 6 is special; this means a base size 4 bytes, 342 * and secondiory (high) size of 2 bytes. This is needed for the 343 * special case of i_blocks_high and i_file_acl_high. 344 */ 345 static errcode_t parse_uint(struct field_set_info *info, char *field, 346 char *arg) 347 { 348 unsigned long long n, num, mask, limit; 349 int suffix = check_suffix(field); 350 char *tmp; 351 void *field1 = info->ptr, *field2 = info->ptr2; 352 int size = (info->size == 6) ? 4 : info->size; 353 union { 354 __u64 *ptr64; 355 __u32 *ptr32; 356 __u16 *ptr16; 357 __u8 *ptr8; 358 } u; 359 360 if (suffix == 1) 361 field2 = 0; 362 if (suffix == 2) { 363 field1 = field2; 364 field2 = 0; 365 } 366 367 u.ptr8 = (__u8 *) field1; 368 if (info->flags & FLAG_ARRAY) 369 u.ptr8 += array_idx * info->size; 370 371 errno = 0; 372 num = STRTOULL(arg, &tmp, 0); 373 if (*tmp || errno) { 374 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 375 arg, info->name); 376 return EINVAL; 377 } 378 mask = ~0ULL >> ((8 - size) * 8); 379 limit = ~0ULL >> ((8 - info->size) * 8); 380 if (field2 && info->size != 6) 381 limit = ~0ULL >> ((8 - info->size*2) * 8); 382 383 if (num > limit) { 384 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n", 385 arg, info->name, limit); 386 return EINVAL; 387 } 388 n = num & mask; 389 switch (size) { 390 case 8: 391 /* Should never get here */ 392 fprintf(stderr, "64-bit field %s has a second 64-bit field\n" 393 "defined; BUG?!?\n", info->name); 394 *u.ptr64 = 0; 395 break; 396 case 4: 397 *u.ptr32 = n; 398 break; 399 case 2: 400 *u.ptr16 = n; 401 break; 402 case 1: 403 *u.ptr8 = n; 404 break; 405 } 406 if (!field2) 407 return 0; 408 n = num >> (size*8); 409 u.ptr8 = (__u8 *) field2; 410 if (info->size == 6) 411 size = 2; 412 switch (size) { 413 case 8: 414 *u.ptr64 = n; 415 break; 416 case 4: 417 *u.ptr32 = n; 418 break; 419 case 2: 420 *u.ptr16 = n; 421 break; 422 case 1: 423 *u.ptr8 = n; 424 break; 425 } 426 return 0; 427 } 428 429 static errcode_t parse_int(struct field_set_info *info, 430 char *field EXT2FS_ATTR((unused)), char *arg) 431 { 432 long num; 433 char *tmp; 434 __s32 *ptr32; 435 __s16 *ptr16; 436 __s8 *ptr8; 437 438 num = strtol(arg, &tmp, 0); 439 if (*tmp) { 440 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 441 arg, info->name); 442 return EINVAL; 443 } 444 switch (info->size) { 445 case 4: 446 ptr32 = (__s32 *) info->ptr; 447 *ptr32 = num; 448 break; 449 case 2: 450 ptr16 = (__s16 *) info->ptr; 451 *ptr16 = num; 452 break; 453 case 1: 454 ptr8 = (__s8 *) info->ptr; 455 *ptr8 = num; 456 break; 457 } 458 return 0; 459 } 460 461 static errcode_t parse_string(struct field_set_info *info, 462 char *field EXT2FS_ATTR((unused)), char *arg) 463 { 464 char *cp = (char *) info->ptr; 465 466 if (strlen(arg) >= info->size) { 467 fprintf(stderr, "Error maximum size for %s is %d.\n", 468 info->name, info->size); 469 return EINVAL; 470 } 471 strcpy(cp, arg); 472 return 0; 473 } 474 475 static errcode_t parse_time(struct field_set_info *info, 476 char *field EXT2FS_ATTR((unused)), char *arg) 477 { 478 time_t t; 479 __u32 *ptr32; 480 481 ptr32 = (__u32 *) info->ptr; 482 483 t = string_to_time(arg); 484 485 if (t == ((time_t) -1)) { 486 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 487 arg, info->name); 488 return EINVAL; 489 } 490 *ptr32 = t; 491 return 0; 492 } 493 494 static errcode_t parse_uuid(struct field_set_info *info, 495 char *field EXT2FS_ATTR((unused)), char *arg) 496 { 497 unsigned char * p = (unsigned char *) info->ptr; 498 499 if ((strcasecmp(arg, "null") == 0) || 500 (strcasecmp(arg, "clear") == 0)) { 501 uuid_clear(p); 502 } else if (strcasecmp(arg, "time") == 0) { 503 uuid_generate_time(p); 504 } else if (strcasecmp(arg, "random") == 0) { 505 uuid_generate(p); 506 } else if (uuid_parse(arg, p)) { 507 fprintf(stderr, "Invalid UUID format: %s\n", arg); 508 return EINVAL; 509 } 510 return 0; 511 } 512 513 static errcode_t parse_hashalg(struct field_set_info *info, 514 char *field EXT2FS_ATTR((unused)), char *arg) 515 { 516 int hashv; 517 unsigned char *p = (unsigned char *) info->ptr; 518 519 hashv = e2p_string2hash(arg); 520 if (hashv < 0) { 521 fprintf(stderr, "Invalid hash algorithm: %s\n", arg); 522 return EINVAL; 523 } 524 *p = hashv; 525 return 0; 526 } 527 528 static errcode_t parse_bmap(struct field_set_info *info, 529 char *field EXT2FS_ATTR((unused)), char *arg) 530 { 531 blk64_t blk; 532 errcode_t retval; 533 char *tmp; 534 535 blk = strtoull(arg, &tmp, 0); 536 if (*tmp) { 537 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 538 arg, info->name); 539 return EINVAL; 540 } 541 542 retval = ext2fs_bmap2(current_fs, set_ino, 543 (struct ext2_inode *) &set_inode, 544 NULL, BMAP_SET, array_idx, NULL, &blk); 545 if (retval) { 546 com_err("set_inode", retval, "while setting block map"); 547 } 548 return retval; 549 } 550 551 static errcode_t parse_gd_csum(struct field_set_info *info, char *field, 552 char *arg) 553 { 554 555 if (strcmp(arg, "calc") == 0) { 556 ext2fs_group_desc_csum_set(current_fs, set_bg); 557 memcpy(&set_gd, ext2fs_group_desc(current_fs, 558 current_fs->group_desc, 559 set_bg), 560 sizeof(set_gd)); 561 printf("Checksum set to 0x%04x\n", 562 ext2fs_bg_checksum(current_fs, set_bg)); 563 return 0; 564 } 565 566 return parse_uint(info, field, arg); 567 } 568 569 static void print_possible_fields(struct field_set_info *fields) 570 { 571 struct field_set_info *ss; 572 const char *type, *cmd; 573 FILE *f; 574 char name[40], idx[40]; 575 576 if (fields == super_fields) { 577 type = "Superblock"; 578 cmd = "set_super_value"; 579 } else if (fields == inode_fields) { 580 type = "Inode"; 581 cmd = "set_inode"; 582 } else if (fields == mmp_fields) { 583 type = "MMP"; 584 cmd = "set_mmp_value"; 585 } else { 586 type = "Block group descriptor"; 587 cmd = "set_block_group"; 588 } 589 f = open_pager(); 590 591 fprintf(f, "%s fields supported by the %s command:\n", type, cmd); 592 593 for (ss = fields ; ss->name ; ss++) { 594 type = "unknown"; 595 if (ss->func == parse_string) 596 type = "string"; 597 else if (ss->func == parse_int) 598 type = "integer"; 599 else if (ss->func == parse_uint) 600 type = "unsigned integer"; 601 else if (ss->func == parse_uuid) 602 type = "UUID"; 603 else if (ss->func == parse_hashalg) 604 type = "hash algorithm"; 605 else if (ss->func == parse_time) 606 type = "date/time"; 607 else if (ss->func == parse_bmap) 608 type = "set physical->logical block map"; 609 else if (ss->func == parse_gd_csum) 610 type = "unsigned integer OR \"calc\""; 611 strcpy(name, ss->name); 612 if (ss->flags & FLAG_ARRAY) { 613 if (ss->max_idx > 0) 614 sprintf(idx, "[%d]", ss->max_idx); 615 else 616 strcpy(idx, "[]"); 617 strcat(name, idx); 618 } 619 if (ss->ptr2) 620 strcat(name, "[_hi|_lo]"); 621 fprintf(f, "\t%-25s\t%s\n", name, type); 622 } 623 close_pager(f); 624 } 625 626 627 void do_set_super(int argc, char *argv[]) 628 { 629 const char *usage = "<field> <value>\n" 630 "\t\"set_super_value -l\" will list the names of " 631 "superblock fields\n\twhich can be set."; 632 static struct field_set_info *ss; 633 634 if ((argc == 2) && !strcmp(argv[1], "-l")) { 635 print_possible_fields(super_fields); 636 return; 637 } 638 639 if (common_args_process(argc, argv, 3, 3, "set_super_value", 640 usage, CHECK_FS_RW)) 641 return; 642 643 if ((ss = find_field(super_fields, argv[1])) == 0) { 644 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); 645 return; 646 } 647 set_sb = *current_fs->super; 648 if (ss->func(ss, argv[1], argv[2]) == 0) { 649 *current_fs->super = set_sb; 650 ext2fs_mark_super_dirty(current_fs); 651 } 652 } 653 654 void do_set_inode(int argc, char *argv[]) 655 { 656 const char *usage = "<inode> <field> <value>\n" 657 "\t\"set_inode_field -l\" will list the names of " 658 "the fields in an ext2 inode\n\twhich can be set."; 659 static struct field_set_info *ss; 660 661 if ((argc == 2) && !strcmp(argv[1], "-l")) { 662 print_possible_fields(inode_fields); 663 return; 664 } 665 666 if (common_args_process(argc, argv, 4, 4, "set_inode", 667 usage, CHECK_FS_RW)) 668 return; 669 670 if ((ss = find_field(inode_fields, argv[2])) == 0) { 671 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 672 return; 673 } 674 675 set_ino = string_to_inode(argv[1]); 676 if (!set_ino) 677 return; 678 679 if (debugfs_read_inode_full(set_ino, 680 (struct ext2_inode *) &set_inode, argv[1], 681 sizeof(set_inode))) 682 return; 683 684 if (ss->func(ss, argv[2], argv[3]) == 0) { 685 if (debugfs_write_inode_full(set_ino, 686 (struct ext2_inode *) &set_inode, 687 argv[1], sizeof(set_inode))) 688 return; 689 } 690 } 691 692 void do_set_block_group_descriptor(int argc, char *argv[]) 693 { 694 const char *usage = "<bg number> <field> <value>\n" 695 "\t\"set_block_group_descriptor -l\" will list the names of " 696 "the fields in a block group descriptor\n\twhich can be set."; 697 struct field_set_info *table; 698 struct field_set_info *ss; 699 char *end; 700 void *edit, *target; 701 int size; 702 703 /* 704 * Determine whether we are editing an ext2 or ext4 block group 705 * descriptor. Descriptors larger than ext4_group_desc cannot 706 * have their fields edited yet, because they do not have any 707 * names assigned. When that happens, this function needs to 708 * be updated for the new descriptor struct and fields. 709 */ 710 if (current_fs && 711 EXT2_DESC_SIZE(current_fs->super) >= EXT2_MIN_DESC_SIZE_64BIT) { 712 table = ext4_bg_fields; 713 edit = &set_gd4; 714 size = sizeof(set_gd4); 715 } else { 716 table = ext2_bg_fields; 717 edit = &set_gd; 718 size = sizeof(set_gd); 719 } 720 721 if ((argc == 2) && !strcmp(argv[1], "-l")) { 722 print_possible_fields(table); 723 return; 724 } 725 726 if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor", 727 usage, CHECK_FS_RW)) 728 return; 729 730 set_bg = strtoul(argv[1], &end, 0); 731 if (*end) { 732 com_err(argv[0], 0, "invalid block group number: %s", argv[1]); 733 return; 734 } 735 736 if (set_bg >= current_fs->group_desc_count) { 737 com_err(argv[0], 0, "block group number too big: %d", set_bg); 738 return; 739 } 740 741 if ((ss = find_field(table, argv[2])) == 0) { 742 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 743 return; 744 } 745 746 target = ext2fs_group_desc(current_fs, current_fs->group_desc, set_bg); 747 memcpy(edit, target, size); 748 if (ss->func(ss, argv[2], argv[3]) == 0) { 749 memcpy(target, edit, size); 750 ext2fs_mark_super_dirty(current_fs); 751 } 752 } 753 754 static errcode_t parse_mmp_clear(struct field_set_info *info, 755 char *field EXT2FS_ATTR((unused)), 756 char *arg EXT2FS_ATTR((unused))) 757 { 758 errcode_t retval; 759 760 retval = ext2fs_mmp_clear(current_fs); 761 if (retval != 0) 762 com_err("set_mmp_value", retval, "while clearing MMP block\n"); 763 else 764 memcpy(info->ptr, current_fs->mmp_buf, info->size); 765 766 return 1; /* we don't need the MMP block written again */ 767 } 768 769 void do_set_mmp_value(int argc, char *argv[]) 770 { 771 const char *usage = "<field> <value>\n" 772 "\t\"set_mmp_value -l\" will list the names of " 773 "MMP fields\n\twhich can be set."; 774 static struct field_set_info *smmp; 775 struct mmp_struct *mmp_s; 776 errcode_t retval; 777 778 if (argc == 2 && strcmp(argv[1], "-l") == 0) { 779 print_possible_fields(mmp_fields); 780 return; 781 } 782 783 if (check_fs_open(argv[0])) 784 return; 785 786 if (current_fs->super->s_mmp_block == 0) { 787 com_err(argv[0], 0, "no MMP block allocated\n"); 788 return; 789 } 790 791 if (common_args_process(argc, argv, 2, 3, "set_mmp_value", 792 usage, CHECK_FS_RW)) 793 return; 794 795 mmp_s = current_fs->mmp_buf; 796 if (mmp_s == NULL) { 797 retval = ext2fs_get_mem(current_fs->blocksize, &mmp_s); 798 if (retval) { 799 com_err(argv[0], retval, "allocating MMP buffer\n"); 800 return; 801 } 802 retval = ext2fs_mmp_read(current_fs, 803 current_fs->super->s_mmp_block, mmp_s); 804 if (retval) { 805 com_err(argv[0], retval, "reading MMP block %llu.\n", 806 (long long)current_fs->super->s_mmp_block); 807 ext2fs_free_mem(&mmp_s); 808 return; 809 } 810 current_fs->mmp_buf = mmp_s; 811 } 812 813 smmp = find_field(mmp_fields, argv[1]); 814 if (smmp == 0) { 815 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); 816 return; 817 } 818 819 set_mmp = *mmp_s; 820 if (smmp->func(smmp, argv[1], argv[2]) == 0) { 821 ext2fs_mmp_write(current_fs, current_fs->super->s_mmp_block, 822 &set_mmp); 823 *mmp_s = set_mmp; 824 } 825 } 826 827
