set_fields.c revision 4dbfd79d1458ce1259b951377e341aeb6197f8c1
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 "config.h" 21#include <stdio.h> 22#include <unistd.h> 23#include <stdlib.h> 24#include <ctype.h> 25#include <string.h> 26#include <strings.h> 27#include <time.h> 28#include <sys/types.h> 29#include <sys/stat.h> 30#ifdef HAVE_ERRNO_H 31#include <errno.h> 32#endif 33#if HAVE_STRINGS_H 34#include <strings.h> 35#endif 36#include <fcntl.h> 37#include <utime.h> 38 39#include "debugfs.h" 40#include "uuid/uuid.h" 41#include "e2p/e2p.h" 42 43static struct ext2_super_block set_sb; 44static struct ext2_inode_large set_inode; 45static struct ext2_group_desc set_gd; 46static struct ext4_group_desc set_gd4; 47static struct mmp_struct set_mmp; 48static dgrp_t set_bg; 49static ext2_ino_t set_ino; 50static int array_idx; 51 52#define FLAG_ARRAY 0x0001 53 54struct field_set_info { 55 const char *name; 56 void *ptr; 57 void *ptr2; 58 unsigned int size; 59 errcode_t (*func)(struct field_set_info *info, char *field, char *arg); 60 int flags; 61 int max_idx; 62}; 63 64static errcode_t parse_uint(struct field_set_info *info, char *field, char *arg); 65static errcode_t parse_int(struct field_set_info *info, char *field, char *arg); 66static errcode_t parse_string(struct field_set_info *info, char *field, char *arg); 67static errcode_t parse_uuid(struct field_set_info *info, char *field, char *arg); 68static errcode_t parse_hashalg(struct field_set_info *info, char *field, char *arg); 69static errcode_t parse_time(struct field_set_info *info, char *field, char *arg); 70static errcode_t parse_bmap(struct field_set_info *info, char *field, char *arg); 71static errcode_t parse_gd_csum(struct field_set_info *info, char *field, char *arg); 72static errcode_t parse_mmp_clear(struct field_set_info *info, char *field, 73 char *arg); 74 75static struct field_set_info super_fields[] = { 76 { "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint }, 77 { "blocks_count", &set_sb.s_blocks_count, &set_sb.s_blocks_count_hi, 78 4, parse_uint }, 79 { "r_blocks_count", &set_sb.s_r_blocks_count, 80 &set_sb.s_r_blocks_count_hi, 4, parse_uint }, 81 { "free_blocks_count", &set_sb.s_free_blocks_count, 82 &set_sb.s_free_blocks_hi, 4, parse_uint }, 83 { "free_inodes_count", &set_sb.s_free_inodes_count, NULL, 4, parse_uint }, 84 { "first_data_block", &set_sb.s_first_data_block, NULL, 4, parse_uint }, 85 { "log_block_size", &set_sb.s_log_block_size, NULL, 4, parse_uint }, 86 { "log_cluster_size", &set_sb.s_log_cluster_size, NULL, 4, parse_int }, 87 { "blocks_per_group", &set_sb.s_blocks_per_group, NULL, 4, parse_uint }, 88 { "clusters_per_group", &set_sb.s_clusters_per_group, NULL, 4, parse_uint }, 89 { "inodes_per_group", &set_sb.s_inodes_per_group, NULL, 4, parse_uint }, 90 { "mtime", &set_sb.s_mtime, NULL, 4, parse_time }, 91 { "wtime", &set_sb.s_wtime, NULL, 4, parse_time }, 92 { "mnt_count", &set_sb.s_mnt_count, NULL, 2, parse_uint }, 93 { "max_mnt_count", &set_sb.s_max_mnt_count, NULL, 2, parse_int }, 94 /* s_magic */ 95 { "state", &set_sb.s_state, NULL, 2, parse_uint }, 96 { "errors", &set_sb.s_errors, NULL, 2, parse_uint }, 97 { "minor_rev_level", &set_sb.s_minor_rev_level, NULL, 2, parse_uint }, 98 { "lastcheck", &set_sb.s_lastcheck, NULL, 4, parse_time }, 99 { "checkinterval", &set_sb.s_checkinterval, NULL, 4, parse_uint }, 100 { "creator_os", &set_sb.s_creator_os, NULL, 4, parse_uint }, 101 { "rev_level", &set_sb.s_rev_level, NULL, 4, parse_uint }, 102 { "def_resuid", &set_sb.s_def_resuid, NULL, 2, parse_uint }, 103 { "def_resgid", &set_sb.s_def_resgid, NULL, 2, parse_uint }, 104 { "first_ino", &set_sb.s_first_ino, NULL, 4, parse_uint }, 105 { "inode_size", &set_sb.s_inode_size, NULL, 2, parse_uint }, 106 { "block_group_nr", &set_sb.s_block_group_nr, NULL, 2, parse_uint }, 107 { "feature_compat", &set_sb.s_feature_compat, NULL, 4, parse_uint }, 108 { "feature_incompat", &set_sb.s_feature_incompat, NULL, 4, parse_uint }, 109 { "feature_ro_compat", &set_sb.s_feature_ro_compat, NULL, 4, parse_uint }, 110 { "uuid", &set_sb.s_uuid, NULL, 16, parse_uuid }, 111 { "volume_name", &set_sb.s_volume_name, NULL, 16, parse_string }, 112 { "last_mounted", &set_sb.s_last_mounted, NULL, 64, parse_string }, 113 { "lastcheck", &set_sb.s_lastcheck, NULL, 4, parse_uint }, 114 { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, NULL, 115 4, parse_uint }, 116 { "prealloc_blocks", &set_sb.s_prealloc_blocks, NULL, 1, parse_uint }, 117 { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, NULL, 1, 118 parse_uint }, 119 { "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, NULL, 2, 120 parse_uint }, 121 { "journal_uuid", &set_sb.s_journal_uuid, NULL, 16, parse_uuid }, 122 { "journal_inum", &set_sb.s_journal_inum, NULL, 4, parse_uint }, 123 { "journal_dev", &set_sb.s_journal_dev, NULL, 4, parse_uint }, 124 { "last_orphan", &set_sb.s_last_orphan, NULL, 4, parse_uint }, 125 { "hash_seed", &set_sb.s_hash_seed, NULL, 16, parse_uuid }, 126 { "def_hash_version", &set_sb.s_def_hash_version, NULL, 1, parse_hashalg }, 127 { "jnl_backup_type", &set_sb.s_jnl_backup_type, NULL, 1, parse_uint }, 128 { "desc_size", &set_sb.s_desc_size, NULL, 2, parse_uint }, 129 { "default_mount_opts", &set_sb.s_default_mount_opts, NULL, 4, parse_uint }, 130 { "first_meta_bg", &set_sb.s_first_meta_bg, NULL, 4, parse_uint }, 131 { "mkfs_time", &set_sb.s_mkfs_time, NULL, 4, parse_time }, 132 { "jnl_blocks", &set_sb.s_jnl_blocks[0], NULL, 4, parse_uint, FLAG_ARRAY, 133 17 }, 134 { "min_extra_isize", &set_sb.s_min_extra_isize, NULL, 2, parse_uint }, 135 { "want_extra_isize", &set_sb.s_want_extra_isize, NULL, 2, parse_uint }, 136 { "flags", &set_sb.s_flags, NULL, 4, parse_uint }, 137 { "raid_stride", &set_sb.s_raid_stride, NULL, 2, parse_uint }, 138 { "min_extra_isize", &set_sb.s_min_extra_isize, NULL, 4, parse_uint }, 139 { "mmp_interval", &set_sb.s_mmp_update_interval, NULL, 2, parse_uint }, 140 { "mmp_block", &set_sb.s_mmp_block, NULL, 8, parse_uint }, 141 { "raid_stripe_width", &set_sb.s_raid_stripe_width, NULL, 4, parse_uint }, 142 { "log_groups_per_flex", &set_sb.s_log_groups_per_flex, NULL, 1, parse_uint }, 143 { "kbytes_written", &set_sb.s_kbytes_written, NULL, 8, parse_uint }, 144 { "snapshot_inum", &set_sb.s_snapshot_inum, NULL, 4, parse_uint }, 145 { "snapshot_id", &set_sb.s_snapshot_id, NULL, 4, parse_uint }, 146 { "snapshot_r_blocks_count", &set_sb.s_snapshot_r_blocks_count, 147 NULL, 8, parse_uint }, 148 { "snapshot_list", &set_sb.s_snapshot_list, NULL, 4, parse_uint }, 149 { "mount_opts", &set_sb.s_mount_opts, NULL, 64, parse_string }, 150 { "usr_quota_inum", &set_sb.s_usr_quota_inum, NULL, 4, parse_uint }, 151 { "grp_quota_inum", &set_sb.s_grp_quota_inum, NULL, 4, parse_uint }, 152 { "overhead_blocks", &set_sb.s_overhead_blocks, NULL, 4, parse_uint }, 153 { "checksum", &set_sb.s_checksum, NULL, 4, parse_uint }, 154 { 0, 0, 0, 0 } 155}; 156 157static struct field_set_info inode_fields[] = { 158 { "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint }, 159 { "mode", &set_inode.i_mode, NULL, 2, parse_uint }, 160 { "uid", &set_inode.i_uid, &set_inode.osd2.linux2.l_i_uid_high, 161 2, parse_uint }, 162 { "size", &set_inode.i_size, &set_inode.i_size_high, 4, parse_uint }, 163 { "atime", &set_inode.i_atime, NULL, 4, parse_time }, 164 { "ctime", &set_inode.i_ctime, NULL, 4, parse_time }, 165 { "mtime", &set_inode.i_mtime, NULL, 4, parse_time }, 166 { "dtime", &set_inode.i_dtime, NULL, 4, parse_time }, 167 { "gid", &set_inode.i_gid, &set_inode.osd2.linux2.l_i_gid_high, 168 2, parse_uint }, 169 { "links_count", &set_inode.i_links_count, NULL, 2, parse_uint }, 170 /* Special case: i_blocks is 4 bytes, i_blocks_high is 2 bytes */ 171 { "blocks", &set_inode.i_blocks, &set_inode.osd2.linux2.l_i_blocks_hi, 172 6, parse_uint }, 173 { "flags", &set_inode.i_flags, NULL, 4, parse_uint }, 174 { "version", &set_inode.osd1.linux1.l_i_version, 175 &set_inode.i_version_hi, 4, parse_uint }, 176 { "translator", &set_inode.osd1.hurd1.h_i_translator, NULL, 4, parse_uint }, 177 { "block", &set_inode.i_block[0], NULL, 4, parse_uint, FLAG_ARRAY, 178 EXT2_NDIR_BLOCKS }, 179 { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], NULL, 4, parse_uint }, 180 { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], NULL, 4, parse_uint }, 181 { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], NULL, 4, parse_uint }, 182 { "generation", &set_inode.i_generation, NULL, 4, parse_uint }, 183 /* Special case: i_file_acl_high is 2 bytes */ 184 { "file_acl", &set_inode.i_file_acl, 185 &set_inode.osd2.linux2.l_i_file_acl_high, 6, parse_uint }, 186 { "dir_acl", &set_inode.i_dir_acl, NULL, 4, parse_uint }, 187 { "faddr", &set_inode.i_faddr, NULL, 4, parse_uint }, 188 { "frag", &set_inode.osd2.hurd2.h_i_frag, NULL, 1, parse_uint }, 189 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, NULL, 1, parse_uint }, 190 { "checksum", &set_inode.osd2.linux2.l_i_checksum_lo, 191 &set_inode.i_checksum_hi, 2, parse_uint }, 192 { "author", &set_inode.osd2.hurd2.h_i_author, NULL, 193 4, parse_uint }, 194 { "extra_isize", &set_inode.i_extra_isize, NULL, 195 2, parse_uint }, 196 { "ctime_extra", &set_inode.i_ctime_extra, NULL, 197 4, parse_uint }, 198 { "mtime_extra", &set_inode.i_mtime_extra, NULL, 199 4, parse_uint }, 200 { "atime_extra", &set_inode.i_atime_extra, NULL, 201 4, parse_uint }, 202 { "crtime", &set_inode.i_crtime, NULL, 4, parse_uint }, 203 { "crtime_extra", &set_inode.i_crtime_extra, NULL, 204 4, parse_uint }, 205 { "bmap", NULL, NULL, 4, parse_bmap, FLAG_ARRAY }, 206 { 0, 0, 0, 0 } 207}; 208 209static struct field_set_info ext2_bg_fields[] = { 210 { "block_bitmap", &set_gd.bg_block_bitmap, NULL, 4, parse_uint }, 211 { "inode_bitmap", &set_gd.bg_inode_bitmap, NULL, 4, parse_uint }, 212 { "inode_table", &set_gd.bg_inode_table, NULL, 4, parse_uint }, 213 { "free_blocks_count", &set_gd.bg_free_blocks_count, NULL, 2, parse_uint }, 214 { "free_inodes_count", &set_gd.bg_free_inodes_count, NULL, 2, parse_uint }, 215 { "used_dirs_count", &set_gd.bg_used_dirs_count, NULL, 2, parse_uint }, 216 { "flags", &set_gd.bg_flags, NULL, 2, parse_uint }, 217 { "itable_unused", &set_gd.bg_itable_unused, NULL, 2, parse_uint }, 218 { "checksum", &set_gd.bg_checksum, NULL, 2, parse_gd_csum }, 219 { 0, 0, 0, 0 } 220}; 221 222static struct field_set_info ext4_bg_fields[] = { 223 { "block_bitmap", &set_gd4.bg_block_bitmap, 224 &set_gd4.bg_block_bitmap_hi, 4, parse_uint }, 225 { "inode_bitmap", &set_gd4.bg_inode_bitmap, 226 &set_gd4.bg_inode_bitmap_hi, 4, parse_uint }, 227 { "inode_table", &set_gd4.bg_inode_table, 228 &set_gd4.bg_inode_table_hi, 4, parse_uint }, 229 { "free_blocks_count", &set_gd4.bg_free_blocks_count, 230 &set_gd4.bg_free_blocks_count_hi, 2, parse_uint }, 231 { "free_inodes_count", &set_gd4.bg_free_inodes_count, 232 &set_gd4.bg_free_inodes_count_hi, 2, parse_uint }, 233 { "used_dirs_count", &set_gd4.bg_used_dirs_count, 234 &set_gd4.bg_used_dirs_count_hi, 2, parse_uint }, 235 { "flags", &set_gd4.bg_flags, NULL, 2, parse_uint }, 236 { "exclude_bitmap", &set_gd4.bg_exclude_bitmap_lo, 237 &set_gd4.bg_exclude_bitmap_hi, 4, parse_uint }, 238 { "block_bitmap_csum", &set_gd4.bg_block_bitmap_csum_lo, 239 &set_gd4.bg_block_bitmap_csum_hi, 2, parse_uint }, 240 { "inode_bitmap_csum", &set_gd4.bg_inode_bitmap_csum_lo, 241 &set_gd4.bg_inode_bitmap_csum_hi, 2, parse_uint }, 242 { "itable_unused", &set_gd4.bg_itable_unused, 243 &set_gd4.bg_itable_unused_hi, 2, parse_uint }, 244 { "checksum", &set_gd4.bg_checksum, NULL, 2, parse_gd_csum }, 245 { 0, 0, 0, 0 } 246}; 247 248static struct field_set_info mmp_fields[] = { 249 { "clear", &set_mmp.mmp_magic, NULL, sizeof(set_mmp), parse_mmp_clear }, 250 { "magic", &set_mmp.mmp_magic, NULL, 4, parse_uint }, 251 { "seq", &set_mmp.mmp_seq, NULL, 4, parse_uint }, 252 { "time", &set_mmp.mmp_time, NULL, 8, parse_uint }, 253 { "nodename", &set_mmp.mmp_nodename, NULL, sizeof(set_mmp.mmp_nodename), 254 parse_string }, 255 { "bdevname", &set_mmp.mmp_bdevname, NULL, sizeof(set_mmp.mmp_bdevname), 256 parse_string }, 257 { "check_interval", &set_mmp.mmp_check_interval, NULL, 2, parse_uint }, 258}; 259 260static int check_suffix(const char *field) 261{ 262 int len = strlen(field); 263 264 if (len <= 3) 265 return 0; 266 field += len-3; 267 if (!strcmp(field, "_lo")) 268 return 1; 269 if (!strcmp(field, "_hi")) 270 return 2; 271 return 0; 272} 273 274static struct field_set_info *find_field(struct field_set_info *fields, 275 char *field) 276{ 277 struct field_set_info *ss; 278 const char *prefix; 279 char *arg, *delim, *idx, *tmp; 280 int suffix, prefix_len; 281 282 if (fields == super_fields) 283 prefix = "s_"; 284 else if (fields == inode_fields) 285 prefix = "i_"; 286 else 287 prefix = "bg_"; 288 prefix_len = strlen(prefix); 289 if (strncmp(field, prefix, prefix_len) == 0) 290 field += prefix_len; 291 292 arg = malloc(strlen(field)+1); 293 if (!arg) 294 return NULL; 295 strcpy(arg, field); 296 297 idx = strchr(arg, '['); 298 if (idx) { 299 *idx++ = 0; 300 delim = idx + strlen(idx) - 1; 301 if (!*idx || *delim != ']') 302 idx = 0; 303 else 304 *delim = 0; 305 } 306 /* 307 * Can we parse the number? 308 */ 309 if (idx) { 310 array_idx = strtol(idx, &tmp, 0); 311 if (*tmp) 312 idx = 0; 313 } 314 315 /* 316 * If there is a valid _hi or a _lo suffix, strip it off 317 */ 318 suffix = check_suffix(arg); 319 if (suffix > 0) 320 arg[strlen(arg)-3] = 0; 321 322 for (ss = fields ; ss->name ; ss++) { 323 if (suffix && ss->ptr2 == 0) 324 continue; 325 if (ss->flags & FLAG_ARRAY) { 326 if (!idx || (strcmp(ss->name, arg) != 0)) 327 continue; 328 if (ss->max_idx > 0 && array_idx >= ss->max_idx) 329 continue; 330 } else { 331 if (strcmp(ss->name, arg) != 0) 332 continue; 333 } 334 free(arg); 335 return ss; 336 } 337 free(arg); 338 return NULL; 339} 340 341/* 342 * Note: info->size == 6 is special; this means a base size 4 bytes, 343 * and secondiory (high) size of 2 bytes. This is needed for the 344 * special case of i_blocks_high and i_file_acl_high. 345 */ 346static errcode_t parse_uint(struct field_set_info *info, char *field, 347 char *arg) 348{ 349 unsigned long long n, num, mask, limit; 350 int suffix = check_suffix(field); 351 char *tmp; 352 void *field1 = info->ptr, *field2 = info->ptr2; 353 int size = (info->size == 6) ? 4 : info->size; 354 union { 355 __u64 *ptr64; 356 __u32 *ptr32; 357 __u16 *ptr16; 358 __u8 *ptr8; 359 } u; 360 361 if (suffix == 1) 362 field2 = 0; 363 if (suffix == 2) { 364 field1 = field2; 365 field2 = 0; 366 } 367 368 u.ptr8 = (__u8 *) field1; 369 if (info->flags & FLAG_ARRAY) 370 u.ptr8 += array_idx * info->size; 371 372 errno = 0; 373 num = STRTOULL(arg, &tmp, 0); 374 if (*tmp || errno) { 375 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 376 arg, info->name); 377 return EINVAL; 378 } 379 mask = ~0ULL >> ((8 - size) * 8); 380 limit = ~0ULL >> ((8 - info->size) * 8); 381 if (field2 && info->size != 6) 382 limit = ~0ULL >> ((8 - info->size*2) * 8); 383 384 if (num > limit) { 385 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n", 386 arg, info->name, limit); 387 return EINVAL; 388 } 389 n = num & mask; 390 switch (size) { 391 case 8: 392 /* Should never get here */ 393 fprintf(stderr, "64-bit field %s has a second 64-bit field\n" 394 "defined; BUG?!?\n", info->name); 395 *u.ptr64 = 0; 396 break; 397 case 4: 398 *u.ptr32 = n; 399 break; 400 case 2: 401 *u.ptr16 = n; 402 break; 403 case 1: 404 *u.ptr8 = n; 405 break; 406 } 407 if (!field2) 408 return 0; 409 n = num >> (size*8); 410 u.ptr8 = (__u8 *) field2; 411 if (info->size == 6) 412 size = 2; 413 switch (size) { 414 case 8: 415 *u.ptr64 = n; 416 break; 417 case 4: 418 *u.ptr32 = n; 419 break; 420 case 2: 421 *u.ptr16 = n; 422 break; 423 case 1: 424 *u.ptr8 = n; 425 break; 426 } 427 return 0; 428} 429 430static errcode_t parse_int(struct field_set_info *info, 431 char *field EXT2FS_ATTR((unused)), char *arg) 432{ 433 long num; 434 char *tmp; 435 __s32 *ptr32; 436 __s16 *ptr16; 437 __s8 *ptr8; 438 439 num = strtol(arg, &tmp, 0); 440 if (*tmp) { 441 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 442 arg, info->name); 443 return EINVAL; 444 } 445 switch (info->size) { 446 case 4: 447 ptr32 = (__s32 *) info->ptr; 448 *ptr32 = num; 449 break; 450 case 2: 451 ptr16 = (__s16 *) info->ptr; 452 *ptr16 = num; 453 break; 454 case 1: 455 ptr8 = (__s8 *) info->ptr; 456 *ptr8 = num; 457 break; 458 } 459 return 0; 460} 461 462static errcode_t parse_string(struct field_set_info *info, 463 char *field EXT2FS_ATTR((unused)), char *arg) 464{ 465 char *cp = (char *) info->ptr; 466 467 if (strlen(arg) >= info->size) { 468 fprintf(stderr, "Error maximum size for %s is %d.\n", 469 info->name, info->size); 470 return EINVAL; 471 } 472 strcpy(cp, arg); 473 return 0; 474} 475 476static errcode_t parse_time(struct field_set_info *info, 477 char *field EXT2FS_ATTR((unused)), char *arg) 478{ 479 time_t t; 480 __u32 *ptr32; 481 482 ptr32 = (__u32 *) info->ptr; 483 484 t = string_to_time(arg); 485 486 if (t == ((time_t) -1)) { 487 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 488 arg, info->name); 489 return EINVAL; 490 } 491 *ptr32 = t; 492 return 0; 493} 494 495static errcode_t parse_uuid(struct field_set_info *info, 496 char *field EXT2FS_ATTR((unused)), char *arg) 497{ 498 unsigned char * p = (unsigned char *) info->ptr; 499 500 if ((strcasecmp(arg, "null") == 0) || 501 (strcasecmp(arg, "clear") == 0)) { 502 uuid_clear(p); 503 } else if (strcasecmp(arg, "time") == 0) { 504 uuid_generate_time(p); 505 } else if (strcasecmp(arg, "random") == 0) { 506 uuid_generate(p); 507 } else if (uuid_parse(arg, p)) { 508 fprintf(stderr, "Invalid UUID format: %s\n", arg); 509 return EINVAL; 510 } 511 return 0; 512} 513 514static errcode_t parse_hashalg(struct field_set_info *info, 515 char *field EXT2FS_ATTR((unused)), char *arg) 516{ 517 int hashv; 518 unsigned char *p = (unsigned char *) info->ptr; 519 520 hashv = e2p_string2hash(arg); 521 if (hashv < 0) { 522 fprintf(stderr, "Invalid hash algorithm: %s\n", arg); 523 return EINVAL; 524 } 525 *p = hashv; 526 return 0; 527} 528 529static errcode_t parse_bmap(struct field_set_info *info, 530 char *field EXT2FS_ATTR((unused)), char *arg) 531{ 532 blk64_t blk; 533 errcode_t retval; 534 char *tmp; 535 536 blk = strtoull(arg, &tmp, 0); 537 if (*tmp) { 538 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 539 arg, info->name); 540 return EINVAL; 541 } 542 543 retval = ext2fs_bmap2(current_fs, set_ino, 544 (struct ext2_inode *) &set_inode, 545 NULL, BMAP_SET, array_idx, NULL, &blk); 546 if (retval) { 547 com_err("set_inode", retval, "while setting block map"); 548 } 549 return retval; 550} 551 552static errcode_t parse_gd_csum(struct field_set_info *info, char *field, 553 char *arg) 554{ 555 556 if (strcmp(arg, "calc") == 0) { 557 ext2fs_group_desc_csum_set(current_fs, set_bg); 558 memcpy(&set_gd, ext2fs_group_desc(current_fs, 559 current_fs->group_desc, 560 set_bg), 561 sizeof(set_gd)); 562 printf("Checksum set to 0x%04x\n", 563 ext2fs_bg_checksum(current_fs, set_bg)); 564 return 0; 565 } 566 567 return parse_uint(info, field, arg); 568} 569 570static void print_possible_fields(struct field_set_info *fields) 571{ 572 struct field_set_info *ss; 573 const char *type, *cmd; 574 FILE *f; 575 char name[40], idx[40]; 576 577 if (fields == super_fields) { 578 type = "Superblock"; 579 cmd = "set_super_value"; 580 } else if (fields == inode_fields) { 581 type = "Inode"; 582 cmd = "set_inode"; 583 } else if (fields == mmp_fields) { 584 type = "MMP"; 585 cmd = "set_mmp_value"; 586 } else { 587 type = "Block group descriptor"; 588 cmd = "set_block_group"; 589 } 590 f = open_pager(); 591 592 fprintf(f, "%s fields supported by the %s command:\n", type, cmd); 593 594 for (ss = fields ; ss->name ; ss++) { 595 type = "unknown"; 596 if (ss->func == parse_string) 597 type = "string"; 598 else if (ss->func == parse_int) 599 type = "integer"; 600 else if (ss->func == parse_uint) 601 type = "unsigned integer"; 602 else if (ss->func == parse_uuid) 603 type = "UUID"; 604 else if (ss->func == parse_hashalg) 605 type = "hash algorithm"; 606 else if (ss->func == parse_time) 607 type = "date/time"; 608 else if (ss->func == parse_bmap) 609 type = "set physical->logical block map"; 610 else if (ss->func == parse_gd_csum) 611 type = "unsigned integer OR \"calc\""; 612 strcpy(name, ss->name); 613 if (ss->flags & FLAG_ARRAY) { 614 if (ss->max_idx > 0) 615 sprintf(idx, "[%d]", ss->max_idx); 616 else 617 strcpy(idx, "[]"); 618 strcat(name, idx); 619 } 620 if (ss->ptr2) 621 strcat(name, "[_hi|_lo]"); 622 fprintf(f, "\t%-25s\t%s\n", name, type); 623 } 624 close_pager(f); 625} 626 627 628void do_set_super(int argc, char *argv[]) 629{ 630 const char *usage = "<field> <value>\n" 631 "\t\"set_super_value -l\" will list the names of " 632 "superblock fields\n\twhich can be set."; 633 static struct field_set_info *ss; 634 635 if ((argc == 2) && !strcmp(argv[1], "-l")) { 636 print_possible_fields(super_fields); 637 return; 638 } 639 640 if (common_args_process(argc, argv, 3, 3, "set_super_value", 641 usage, CHECK_FS_RW)) 642 return; 643 644 if ((ss = find_field(super_fields, argv[1])) == 0) { 645 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); 646 return; 647 } 648 set_sb = *current_fs->super; 649 if (ss->func(ss, argv[1], argv[2]) == 0) { 650 *current_fs->super = set_sb; 651 ext2fs_mark_super_dirty(current_fs); 652 } 653} 654 655void do_set_inode(int argc, char *argv[]) 656{ 657 const char *usage = "<inode> <field> <value>\n" 658 "\t\"set_inode_field -l\" will list the names of " 659 "the fields in an ext2 inode\n\twhich can be set."; 660 static struct field_set_info *ss; 661 662 if ((argc == 2) && !strcmp(argv[1], "-l")) { 663 print_possible_fields(inode_fields); 664 return; 665 } 666 667 if (common_args_process(argc, argv, 4, 4, "set_inode", 668 usage, CHECK_FS_RW)) 669 return; 670 671 if ((ss = find_field(inode_fields, argv[2])) == 0) { 672 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 673 return; 674 } 675 676 set_ino = string_to_inode(argv[1]); 677 if (!set_ino) 678 return; 679 680 if (debugfs_read_inode_full(set_ino, 681 (struct ext2_inode *) &set_inode, argv[1], 682 sizeof(set_inode))) 683 return; 684 685 if (ss->func(ss, argv[2], argv[3]) == 0) { 686 if (debugfs_write_inode_full(set_ino, 687 (struct ext2_inode *) &set_inode, 688 argv[1], sizeof(set_inode))) 689 return; 690 } 691} 692 693void do_set_block_group_descriptor(int argc, char *argv[]) 694{ 695 const char *usage = "<bg number> <field> <value>\n" 696 "\t\"set_block_group_descriptor -l\" will list the names of " 697 "the fields in a block group descriptor\n\twhich can be set."; 698 struct field_set_info *table; 699 struct field_set_info *ss; 700 char *end; 701 void *edit, *target; 702 int size; 703 704 /* 705 *Determine whether we are editing an ext2 or ext4 block 706 * group descriptor 707 */ 708 if (current_fs && current_fs->super->s_feature_incompat & 709 EXT4_FEATURE_INCOMPAT_64BIT) { 710 table = ext4_bg_fields; 711 edit = &set_gd4; 712 size = sizeof(set_gd4); 713 } else { 714 table = ext2_bg_fields; 715 edit = &set_gd; 716 size = sizeof(set_gd); 717 } 718 719 if ((argc == 2) && !strcmp(argv[1], "-l")) { 720 print_possible_fields(table); 721 return; 722 } 723 724 if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor", 725 usage, CHECK_FS_RW)) 726 return; 727 728 set_bg = strtoul(argv[1], &end, 0); 729 if (*end) { 730 com_err(argv[0], 0, "invalid block group number: %s", argv[1]); 731 return; 732 } 733 734 if (set_bg >= current_fs->group_desc_count) { 735 com_err(argv[0], 0, "block group number too big: %d", set_bg); 736 return; 737 } 738 739 if ((ss = find_field(table, argv[2])) == 0) { 740 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 741 return; 742 } 743 744 target = ext2fs_group_desc(current_fs, current_fs->group_desc, set_bg); 745 memcpy(edit, target, size); 746 if (ss->func(ss, argv[2], argv[3]) == 0) { 747 memcpy(target, edit, size); 748 ext2fs_mark_super_dirty(current_fs); 749 } 750} 751 752static errcode_t parse_mmp_clear(struct field_set_info *info, 753 char *field EXT2FS_ATTR((unused)), 754 char *arg EXT2FS_ATTR((unused))) 755{ 756 errcode_t retval; 757 758 retval = ext2fs_mmp_clear(current_fs); 759 if (retval != 0) 760 com_err("set_mmp_value", retval, "while clearing MMP block\n"); 761 else 762 memcpy(info->ptr, current_fs->mmp_buf, info->size); 763 764 return 1; /* we don't need the MMP block written again */ 765} 766 767void do_set_mmp_value(int argc, char *argv[]) 768{ 769 const char *usage = "<field> <value>\n" 770 "\t\"set_mmp_value -l\" will list the names of " 771 "MMP fields\n\twhich can be set."; 772 static struct field_set_info *smmp; 773 struct mmp_struct *mmp_s; 774 errcode_t retval; 775 776 if (argc == 2 && strcmp(argv[1], "-l") == 0) { 777 print_possible_fields(mmp_fields); 778 return; 779 } 780 781 if (check_fs_open(argv[0])) 782 return; 783 784 if (current_fs->super->s_mmp_block == 0) { 785 com_err(argv[0], 0, "no MMP block allocated\n"); 786 return; 787 } 788 789 if (common_args_process(argc, argv, 2, 3, "set_mmp_value", 790 usage, CHECK_FS_RW)) 791 return; 792 793 mmp_s = current_fs->mmp_buf; 794 if (mmp_s == NULL) { 795 retval = ext2fs_get_mem(current_fs->blocksize, &mmp_s); 796 if (retval) { 797 com_err(argv[0], retval, "allocating MMP buffer\n"); 798 return; 799 } 800 retval = ext2fs_mmp_read(current_fs, 801 current_fs->super->s_mmp_block, mmp_s); 802 if (retval) { 803 com_err(argv[0], retval, "reading MMP block %llu.\n", 804 (long long)current_fs->super->s_mmp_block); 805 ext2fs_free_mem(mmp_s); 806 return; 807 } 808 current_fs->mmp_buf = mmp_s; 809 } 810 811 smmp = find_field(mmp_fields, argv[1]); 812 if (smmp == 0) { 813 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); 814 return; 815 } 816 817 set_mmp = *mmp_s; 818 if (smmp->func(smmp, argv[1], argv[2]) == 0) { 819 ext2fs_mmp_write(current_fs, current_fs->super->s_mmp_block, 820 &set_mmp); 821 *mmp_s = set_mmp; 822 } 823} 824 825