set_fields.c revision f9f3050a0ad9be1c37b00c8478199d286ddcaeda
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 { "backup_bgs", &set_sb.s_backup_bgs[0], NULL, 4, parse_uint, 154 FLAG_ARRAY, 2 }, 155 { "checksum", &set_sb.s_checksum, NULL, 4, parse_uint }, 156 { "checksum_type", &set_sb.s_checksum_type, NULL, 1, parse_uint }, 157 { "error_count", &set_sb.s_error_count, NULL, 4, parse_uint }, 158 { "first_error_time", &set_sb.s_first_error_time, NULL, 4, parse_time }, 159 { "first_error_ino", &set_sb.s_first_error_ino, NULL, 4, parse_uint }, 160 { "first_error_block", &set_sb.s_first_error_block, NULL, 8, parse_uint }, 161 { "first_error_func", &set_sb.s_first_error_func, NULL, 32, parse_string }, 162 { "first_error_line", &set_sb.s_first_error_ino, NULL, 4, parse_uint }, 163 { "last_error_time", &set_sb.s_last_error_time, NULL, 4, parse_time }, 164 { "last_error_ino", &set_sb.s_last_error_ino, NULL, 4, parse_uint }, 165 { "last_error_block", &set_sb.s_last_error_block, NULL, 8, parse_uint }, 166 { "last_error_func", &set_sb.s_last_error_func, NULL, 32, parse_string }, 167 { "last_error_line", &set_sb.s_last_error_ino, NULL, 4, parse_uint }, 168 { 0, 0, 0, 0 } 169}; 170 171static struct field_set_info inode_fields[] = { 172 { "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint }, 173 { "mode", &set_inode.i_mode, NULL, 2, parse_uint }, 174 { "uid", &set_inode.i_uid, &set_inode.osd2.linux2.l_i_uid_high, 175 2, parse_uint }, 176 { "size", &set_inode.i_size, &set_inode.i_size_high, 4, parse_uint }, 177 { "atime", &set_inode.i_atime, NULL, 4, parse_time }, 178 { "ctime", &set_inode.i_ctime, NULL, 4, parse_time }, 179 { "mtime", &set_inode.i_mtime, NULL, 4, parse_time }, 180 { "dtime", &set_inode.i_dtime, NULL, 4, parse_time }, 181 { "gid", &set_inode.i_gid, &set_inode.osd2.linux2.l_i_gid_high, 182 2, parse_uint }, 183 { "links_count", &set_inode.i_links_count, NULL, 2, parse_uint }, 184 /* Special case: i_blocks is 4 bytes, i_blocks_high is 2 bytes */ 185 { "blocks", &set_inode.i_blocks, &set_inode.osd2.linux2.l_i_blocks_hi, 186 6, parse_uint }, 187 { "flags", &set_inode.i_flags, NULL, 4, parse_uint }, 188 { "version", &set_inode.osd1.linux1.l_i_version, 189 &set_inode.i_version_hi, 4, parse_uint }, 190 { "translator", &set_inode.osd1.hurd1.h_i_translator, NULL, 4, parse_uint }, 191 { "block", &set_inode.i_block[0], NULL, 4, parse_uint, FLAG_ARRAY, 192 EXT2_NDIR_BLOCKS }, 193 { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], NULL, 4, parse_uint }, 194 { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], NULL, 4, parse_uint }, 195 { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], NULL, 4, parse_uint }, 196 { "generation", &set_inode.i_generation, NULL, 4, parse_uint }, 197 /* Special case: i_file_acl_high is 2 bytes */ 198 { "file_acl", &set_inode.i_file_acl, 199 &set_inode.osd2.linux2.l_i_file_acl_high, 6, parse_uint }, 200 { "dir_acl", &set_inode.i_dir_acl, NULL, 4, parse_uint }, 201 { "faddr", &set_inode.i_faddr, NULL, 4, parse_uint }, 202 { "frag", &set_inode.osd2.hurd2.h_i_frag, NULL, 1, parse_uint }, 203 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, NULL, 1, parse_uint }, 204 { "checksum", &set_inode.osd2.linux2.l_i_checksum_lo, 205 &set_inode.i_checksum_hi, 2, parse_uint }, 206 { "author", &set_inode.osd2.hurd2.h_i_author, NULL, 207 4, parse_uint }, 208 { "extra_isize", &set_inode.i_extra_isize, NULL, 209 2, parse_uint }, 210 { "ctime_extra", &set_inode.i_ctime_extra, NULL, 211 4, parse_uint }, 212 { "mtime_extra", &set_inode.i_mtime_extra, NULL, 213 4, parse_uint }, 214 { "atime_extra", &set_inode.i_atime_extra, NULL, 215 4, parse_uint }, 216 { "crtime", &set_inode.i_crtime, NULL, 4, parse_uint }, 217 { "crtime_extra", &set_inode.i_crtime_extra, NULL, 218 4, parse_uint }, 219 { "bmap", NULL, NULL, 4, parse_bmap, FLAG_ARRAY }, 220 { 0, 0, 0, 0 } 221}; 222 223static struct field_set_info ext2_bg_fields[] = { 224 { "block_bitmap", &set_gd.bg_block_bitmap, NULL, 4, parse_uint }, 225 { "inode_bitmap", &set_gd.bg_inode_bitmap, NULL, 4, parse_uint }, 226 { "inode_table", &set_gd.bg_inode_table, NULL, 4, parse_uint }, 227 { "free_blocks_count", &set_gd.bg_free_blocks_count, NULL, 2, parse_uint }, 228 { "free_inodes_count", &set_gd.bg_free_inodes_count, NULL, 2, parse_uint }, 229 { "used_dirs_count", &set_gd.bg_used_dirs_count, NULL, 2, parse_uint }, 230 { "flags", &set_gd.bg_flags, NULL, 2, parse_uint }, 231 { "itable_unused", &set_gd.bg_itable_unused, NULL, 2, parse_uint }, 232 { "checksum", &set_gd.bg_checksum, NULL, 2, parse_gd_csum }, 233 { 0, 0, 0, 0 } 234}; 235 236static struct field_set_info ext4_bg_fields[] = { 237 { "block_bitmap", &set_gd4.bg_block_bitmap, 238 &set_gd4.bg_block_bitmap_hi, 4, parse_uint }, 239 { "inode_bitmap", &set_gd4.bg_inode_bitmap, 240 &set_gd4.bg_inode_bitmap_hi, 4, parse_uint }, 241 { "inode_table", &set_gd4.bg_inode_table, 242 &set_gd4.bg_inode_table_hi, 4, parse_uint }, 243 { "free_blocks_count", &set_gd4.bg_free_blocks_count, 244 &set_gd4.bg_free_blocks_count_hi, 2, parse_uint }, 245 { "free_inodes_count", &set_gd4.bg_free_inodes_count, 246 &set_gd4.bg_free_inodes_count_hi, 2, parse_uint }, 247 { "used_dirs_count", &set_gd4.bg_used_dirs_count, 248 &set_gd4.bg_used_dirs_count_hi, 2, parse_uint }, 249 { "flags", &set_gd4.bg_flags, NULL, 2, parse_uint }, 250 { "exclude_bitmap", &set_gd4.bg_exclude_bitmap_lo, 251 &set_gd4.bg_exclude_bitmap_hi, 4, parse_uint }, 252 { "block_bitmap_csum", &set_gd4.bg_block_bitmap_csum_lo, 253 &set_gd4.bg_block_bitmap_csum_hi, 2, parse_uint }, 254 { "inode_bitmap_csum", &set_gd4.bg_inode_bitmap_csum_lo, 255 &set_gd4.bg_inode_bitmap_csum_hi, 2, parse_uint }, 256 { "itable_unused", &set_gd4.bg_itable_unused, 257 &set_gd4.bg_itable_unused_hi, 2, parse_uint }, 258 { "checksum", &set_gd4.bg_checksum, NULL, 2, parse_gd_csum }, 259 { 0, 0, 0, 0 } 260}; 261 262static struct field_set_info mmp_fields[] = { 263 { "clear", &set_mmp.mmp_magic, NULL, sizeof(set_mmp), parse_mmp_clear }, 264 { "magic", &set_mmp.mmp_magic, NULL, 4, parse_uint }, 265 { "seq", &set_mmp.mmp_seq, NULL, 4, parse_uint }, 266 { "time", &set_mmp.mmp_time, NULL, 8, parse_uint }, 267 { "nodename", &set_mmp.mmp_nodename, NULL, sizeof(set_mmp.mmp_nodename), 268 parse_string }, 269 { "bdevname", &set_mmp.mmp_bdevname, NULL, sizeof(set_mmp.mmp_bdevname), 270 parse_string }, 271 { "check_interval", &set_mmp.mmp_check_interval, NULL, 2, parse_uint }, 272 { "checksum", &set_mmp.mmp_checksum, NULL, 4, parse_uint }, 273}; 274 275static int check_suffix(const char *field) 276{ 277 int len = strlen(field); 278 279 if (len <= 3) 280 return 0; 281 field += len-3; 282 if (!strcmp(field, "_lo")) 283 return 1; 284 if (!strcmp(field, "_hi")) 285 return 2; 286 return 0; 287} 288 289static struct field_set_info *find_field(struct field_set_info *fields, 290 char *field) 291{ 292 struct field_set_info *ss; 293 const char *prefix; 294 char *arg, *delim, *idx, *tmp; 295 int suffix, prefix_len; 296 297 if (fields == super_fields) 298 prefix = "s_"; 299 else if (fields == inode_fields) 300 prefix = "i_"; 301 else 302 prefix = "bg_"; 303 prefix_len = strlen(prefix); 304 if (strncmp(field, prefix, prefix_len) == 0) 305 field += prefix_len; 306 307 arg = malloc(strlen(field)+1); 308 if (!arg) 309 return NULL; 310 strcpy(arg, field); 311 312 idx = strchr(arg, '['); 313 if (idx) { 314 *idx++ = 0; 315 delim = idx + strlen(idx) - 1; 316 if (!*idx || *delim != ']') 317 idx = 0; 318 else 319 *delim = 0; 320 } 321 /* 322 * Can we parse the number? 323 */ 324 if (idx) { 325 array_idx = strtol(idx, &tmp, 0); 326 if (*tmp) 327 idx = 0; 328 } 329 330 /* 331 * If there is a valid _hi or a _lo suffix, strip it off 332 */ 333 suffix = check_suffix(arg); 334 if (suffix > 0) 335 arg[strlen(arg)-3] = 0; 336 337 for (ss = fields ; ss->name ; ss++) { 338 if (suffix && ss->ptr2 == 0) 339 continue; 340 if (ss->flags & FLAG_ARRAY) { 341 if (!idx || (strcmp(ss->name, arg) != 0)) 342 continue; 343 if (ss->max_idx > 0 && array_idx >= ss->max_idx) 344 continue; 345 } else { 346 if (strcmp(ss->name, arg) != 0) 347 continue; 348 } 349 free(arg); 350 return ss; 351 } 352 free(arg); 353 return NULL; 354} 355 356/* 357 * Note: info->size == 6 is special; this means a base size 4 bytes, 358 * and secondiory (high) size of 2 bytes. This is needed for the 359 * special case of i_blocks_high and i_file_acl_high. 360 */ 361static errcode_t parse_uint(struct field_set_info *info, char *field, 362 char *arg) 363{ 364 unsigned long long n, num, mask, limit; 365 int suffix = check_suffix(field); 366 char *tmp; 367 void *field1 = info->ptr, *field2 = info->ptr2; 368 int size = (info->size == 6) ? 4 : info->size; 369 union { 370 __u64 *ptr64; 371 __u32 *ptr32; 372 __u16 *ptr16; 373 __u8 *ptr8; 374 } u; 375 376 if (suffix == 1) 377 field2 = 0; 378 if (suffix == 2) { 379 field1 = field2; 380 field2 = 0; 381 } 382 383 u.ptr8 = (__u8 *) field1; 384 if (info->flags & FLAG_ARRAY) 385 u.ptr8 += array_idx * info->size; 386 387 errno = 0; 388 num = STRTOULL(arg, &tmp, 0); 389 if (*tmp || errno) { 390 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 391 arg, info->name); 392 return EINVAL; 393 } 394 mask = ~0ULL >> ((8 - size) * 8); 395 limit = ~0ULL >> ((8 - info->size) * 8); 396 if (field2 && info->size != 6) 397 limit = ~0ULL >> ((8 - info->size*2) * 8); 398 399 if (num > limit) { 400 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n", 401 arg, info->name, limit); 402 return EINVAL; 403 } 404 n = num & mask; 405 switch (size) { 406 case 8: 407 /* Should never get here */ 408 fprintf(stderr, "64-bit field %s has a second 64-bit field\n" 409 "defined; BUG?!?\n", info->name); 410 *u.ptr64 = 0; 411 break; 412 case 4: 413 *u.ptr32 = n; 414 break; 415 case 2: 416 *u.ptr16 = n; 417 break; 418 case 1: 419 *u.ptr8 = n; 420 break; 421 } 422 if (!field2) 423 return 0; 424 n = num >> (size*8); 425 u.ptr8 = (__u8 *) field2; 426 if (info->size == 6) 427 size = 2; 428 switch (size) { 429 case 8: 430 *u.ptr64 = n; 431 break; 432 case 4: 433 *u.ptr32 = n; 434 break; 435 case 2: 436 *u.ptr16 = n; 437 break; 438 case 1: 439 *u.ptr8 = n; 440 break; 441 } 442 return 0; 443} 444 445static errcode_t parse_int(struct field_set_info *info, 446 char *field EXT2FS_ATTR((unused)), char *arg) 447{ 448 long num; 449 char *tmp; 450 __s32 *ptr32; 451 __s16 *ptr16; 452 __s8 *ptr8; 453 454 num = strtol(arg, &tmp, 0); 455 if (*tmp) { 456 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 457 arg, info->name); 458 return EINVAL; 459 } 460 switch (info->size) { 461 case 4: 462 ptr32 = (__s32 *) info->ptr; 463 *ptr32 = num; 464 break; 465 case 2: 466 ptr16 = (__s16 *) info->ptr; 467 *ptr16 = num; 468 break; 469 case 1: 470 ptr8 = (__s8 *) info->ptr; 471 *ptr8 = num; 472 break; 473 } 474 return 0; 475} 476 477static errcode_t parse_string(struct field_set_info *info, 478 char *field EXT2FS_ATTR((unused)), char *arg) 479{ 480 char *cp = (char *) info->ptr; 481 482 if (strlen(arg) >= info->size) { 483 fprintf(stderr, "Error maximum size for %s is %d.\n", 484 info->name, info->size); 485 return EINVAL; 486 } 487 strcpy(cp, arg); 488 return 0; 489} 490 491static errcode_t parse_time(struct field_set_info *info, 492 char *field EXT2FS_ATTR((unused)), char *arg) 493{ 494 time_t t; 495 __u32 *ptr32; 496 497 ptr32 = (__u32 *) info->ptr; 498 499 t = string_to_time(arg); 500 501 if (t == ((time_t) -1)) { 502 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 503 arg, info->name); 504 return EINVAL; 505 } 506 *ptr32 = t; 507 return 0; 508} 509 510static errcode_t parse_uuid(struct field_set_info *info, 511 char *field EXT2FS_ATTR((unused)), char *arg) 512{ 513 unsigned char * p = (unsigned char *) info->ptr; 514 515 if ((strcasecmp(arg, "null") == 0) || 516 (strcasecmp(arg, "clear") == 0)) { 517 uuid_clear(p); 518 } else if (strcasecmp(arg, "time") == 0) { 519 uuid_generate_time(p); 520 } else if (strcasecmp(arg, "random") == 0) { 521 uuid_generate(p); 522 } else if (uuid_parse(arg, p)) { 523 fprintf(stderr, "Invalid UUID format: %s\n", arg); 524 return EINVAL; 525 } 526 return 0; 527} 528 529static errcode_t parse_hashalg(struct field_set_info *info, 530 char *field EXT2FS_ATTR((unused)), char *arg) 531{ 532 int hashv; 533 unsigned char *p = (unsigned char *) info->ptr; 534 535 hashv = e2p_string2hash(arg); 536 if (hashv < 0) { 537 fprintf(stderr, "Invalid hash algorithm: %s\n", arg); 538 return EINVAL; 539 } 540 *p = hashv; 541 return 0; 542} 543 544static errcode_t parse_bmap(struct field_set_info *info, 545 char *field EXT2FS_ATTR((unused)), char *arg) 546{ 547 blk64_t blk; 548 errcode_t retval; 549 char *tmp; 550 551 blk = strtoull(arg, &tmp, 0); 552 if (*tmp) { 553 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 554 arg, info->name); 555 return EINVAL; 556 } 557 558 retval = ext2fs_bmap2(current_fs, set_ino, 559 (struct ext2_inode *) &set_inode, 560 NULL, BMAP_ALLOC | BMAP_SET, array_idx, NULL, 561 &blk); 562 if (retval) { 563 com_err("set_inode", retval, "while setting block map"); 564 } 565 return retval; 566} 567 568static errcode_t parse_gd_csum(struct field_set_info *info, char *field, 569 char *arg) 570{ 571 572 if (strcmp(arg, "calc") == 0) { 573 ext2fs_group_desc_csum_set(current_fs, set_bg); 574 memcpy(&set_gd, ext2fs_group_desc(current_fs, 575 current_fs->group_desc, 576 set_bg), 577 sizeof(set_gd)); 578 printf("Checksum set to 0x%04x\n", 579 ext2fs_bg_checksum(current_fs, set_bg)); 580 return 0; 581 } 582 583 return parse_uint(info, field, arg); 584} 585 586static void print_possible_fields(struct field_set_info *fields) 587{ 588 struct field_set_info *ss; 589 const char *type, *cmd; 590 FILE *f; 591 char name[40], idx[40]; 592 593 if (fields == super_fields) { 594 type = "Superblock"; 595 cmd = "set_super_value"; 596 } else if (fields == inode_fields) { 597 type = "Inode"; 598 cmd = "set_inode"; 599 } else if (fields == mmp_fields) { 600 type = "MMP"; 601 cmd = "set_mmp_value"; 602 } else { 603 type = "Block group descriptor"; 604 cmd = "set_block_group"; 605 } 606 f = open_pager(); 607 608 fprintf(f, "%s fields supported by the %s command:\n", type, cmd); 609 610 for (ss = fields ; ss->name ; ss++) { 611 type = "unknown"; 612 if (ss->func == parse_string) 613 type = "string"; 614 else if (ss->func == parse_int) 615 type = "integer"; 616 else if (ss->func == parse_uint) 617 type = "unsigned integer"; 618 else if (ss->func == parse_uuid) 619 type = "UUID"; 620 else if (ss->func == parse_hashalg) 621 type = "hash algorithm"; 622 else if (ss->func == parse_time) 623 type = "date/time"; 624 else if (ss->func == parse_bmap) 625 type = "set physical->logical block map"; 626 else if (ss->func == parse_gd_csum) 627 type = "unsigned integer OR \"calc\""; 628 strcpy(name, ss->name); 629 if (ss->flags & FLAG_ARRAY) { 630 if (ss->max_idx > 0) 631 sprintf(idx, "[%d]", ss->max_idx); 632 else 633 strcpy(idx, "[]"); 634 strcat(name, idx); 635 } 636 if (ss->ptr2) 637 strcat(name, "[_hi|_lo]"); 638 fprintf(f, "\t%-25s\t%s\n", name, type); 639 } 640 close_pager(f); 641} 642 643 644void do_set_super(int argc, char *argv[]) 645{ 646 const char *usage = "<field> <value>\n" 647 "\t\"set_super_value -l\" will list the names of " 648 "superblock fields\n\twhich can be set."; 649 static struct field_set_info *ss; 650 651 if ((argc == 2) && !strcmp(argv[1], "-l")) { 652 print_possible_fields(super_fields); 653 return; 654 } 655 656 if (common_args_process(argc, argv, 3, 3, "set_super_value", 657 usage, CHECK_FS_RW)) 658 return; 659 660 if ((ss = find_field(super_fields, argv[1])) == 0) { 661 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); 662 return; 663 } 664 set_sb = *current_fs->super; 665 if (ss->func(ss, argv[1], argv[2]) == 0) { 666 *current_fs->super = set_sb; 667 ext2fs_mark_super_dirty(current_fs); 668 } 669} 670 671void do_set_inode(int argc, char *argv[]) 672{ 673 const char *usage = "<inode> <field> <value>\n" 674 "\t\"set_inode_field -l\" will list the names of " 675 "the fields in an ext2 inode\n\twhich can be set."; 676 static struct field_set_info *ss; 677 678 if ((argc == 2) && !strcmp(argv[1], "-l")) { 679 print_possible_fields(inode_fields); 680 return; 681 } 682 683 if (common_args_process(argc, argv, 4, 4, "set_inode", 684 usage, CHECK_FS_RW)) 685 return; 686 687 if ((ss = find_field(inode_fields, argv[2])) == 0) { 688 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 689 return; 690 } 691 692 set_ino = string_to_inode(argv[1]); 693 if (!set_ino) 694 return; 695 696 if (debugfs_read_inode_full(set_ino, 697 (struct ext2_inode *) &set_inode, argv[1], 698 sizeof(set_inode))) 699 return; 700 701 if (ss->func(ss, argv[2], argv[3]) == 0) { 702 if (debugfs_write_inode_full(set_ino, 703 (struct ext2_inode *) &set_inode, 704 argv[1], sizeof(set_inode))) 705 return; 706 } 707} 708 709void do_set_block_group_descriptor(int argc, char *argv[]) 710{ 711 const char *usage = "<bg number> <field> <value>\n" 712 "\t\"set_block_group_descriptor -l\" will list the names of " 713 "the fields in a block group descriptor\n\twhich can be set."; 714 struct field_set_info *table; 715 struct field_set_info *ss; 716 char *end; 717 void *edit, *target; 718 int size; 719 720 /* 721 * Determine whether we are editing an ext2 or ext4 block group 722 * descriptor. Descriptors larger than ext4_group_desc cannot 723 * have their fields edited yet, because they do not have any 724 * names assigned. When that happens, this function needs to 725 * be updated for the new descriptor struct and fields. 726 */ 727 if (current_fs && 728 EXT2_DESC_SIZE(current_fs->super) >= EXT2_MIN_DESC_SIZE_64BIT) { 729 table = ext4_bg_fields; 730 edit = &set_gd4; 731 size = sizeof(set_gd4); 732 } else { 733 table = ext2_bg_fields; 734 edit = &set_gd; 735 size = sizeof(set_gd); 736 } 737 738 if ((argc == 2) && !strcmp(argv[1], "-l")) { 739 print_possible_fields(table); 740 return; 741 } 742 743 if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor", 744 usage, CHECK_FS_RW)) 745 return; 746 747 set_bg = strtoul(argv[1], &end, 0); 748 if (*end) { 749 com_err(argv[0], 0, "invalid block group number: %s", argv[1]); 750 return; 751 } 752 753 if (set_bg >= current_fs->group_desc_count) { 754 com_err(argv[0], 0, "block group number too big: %d", set_bg); 755 return; 756 } 757 758 if ((ss = find_field(table, argv[2])) == 0) { 759 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 760 return; 761 } 762 763 target = ext2fs_group_desc(current_fs, current_fs->group_desc, set_bg); 764 memcpy(edit, target, size); 765 if (ss->func(ss, argv[2], argv[3]) == 0) { 766 memcpy(target, edit, size); 767 ext2fs_mark_super_dirty(current_fs); 768 } 769} 770 771static errcode_t parse_mmp_clear(struct field_set_info *info, 772 char *field EXT2FS_ATTR((unused)), 773 char *arg EXT2FS_ATTR((unused))) 774{ 775 errcode_t retval; 776 777 retval = ext2fs_mmp_clear(current_fs); 778 if (retval != 0) 779 com_err("set_mmp_value", retval, "while clearing MMP block\n"); 780 else 781 memcpy(info->ptr, current_fs->mmp_buf, info->size); 782 783 return 1; /* we don't need the MMP block written again */ 784} 785 786void do_set_mmp_value(int argc, char *argv[]) 787{ 788#ifdef CONFIG_MMP 789 const char *usage = "<field> <value>\n" 790 "\t\"set_mmp_value -l\" will list the names of " 791 "MMP fields\n\twhich can be set."; 792 static struct field_set_info *smmp; 793 struct mmp_struct *mmp_s; 794 errcode_t retval; 795 796 if (argc == 2 && strcmp(argv[1], "-l") == 0) { 797 print_possible_fields(mmp_fields); 798 return; 799 } 800 801 if (check_fs_open(argv[0])) 802 return; 803 804 if (current_fs->super->s_mmp_block == 0) { 805 com_err(argv[0], 0, "no MMP block allocated\n"); 806 return; 807 } 808 809 if (common_args_process(argc, argv, 2, 3, "set_mmp_value", 810 usage, CHECK_FS_RW)) 811 return; 812 813 mmp_s = current_fs->mmp_buf; 814 if (mmp_s == NULL) { 815 retval = ext2fs_get_mem(current_fs->blocksize, &mmp_s); 816 if (retval) { 817 com_err(argv[0], retval, "allocating MMP buffer\n"); 818 return; 819 } 820 retval = ext2fs_mmp_read(current_fs, 821 current_fs->super->s_mmp_block, mmp_s); 822 if (retval) { 823 com_err(argv[0], retval, "reading MMP block %llu.\n", 824 (long long)current_fs->super->s_mmp_block); 825 ext2fs_free_mem(&mmp_s); 826 return; 827 } 828 current_fs->mmp_buf = mmp_s; 829 } 830 831 smmp = find_field(mmp_fields, argv[1]); 832 if (smmp == 0) { 833 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); 834 return; 835 } 836 837 set_mmp = *mmp_s; 838 if (smmp->func(smmp, argv[1], argv[2]) == 0) { 839 ext2fs_mmp_write(current_fs, current_fs->super->s_mmp_block, 840 &set_mmp); 841 *mmp_s = set_mmp; 842 } 843#else 844 fprintf(stdout, "MMP is unsupported, please recompile with " 845 "--enable-mmp\n"); 846#endif 847} 848 849