set_fields.c revision 188960ea4b830ec69607aab3068537ce55f44be4
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#include <assert.h> 34#if HAVE_STRINGS_H 35#include <strings.h> 36#endif 37#include <fcntl.h> 38#include <utime.h> 39 40#include "debugfs.h" 41#include "uuid/uuid.h" 42#include "e2p/e2p.h" 43 44static struct ext2_super_block set_sb; 45static struct ext2_inode_large set_inode; 46static struct ext2_group_desc set_gd; 47static struct ext4_group_desc set_gd4; 48static struct mmp_struct set_mmp; 49static dgrp_t set_bg; 50static ext2_ino_t set_ino; 51static int array_idx; 52 53#define FLAG_ARRAY 0x0001 54#define FLAG_ALIAS 0x0002 /* Data intersects with other field */ 55 56struct field_set_info { 57 const char *name; 58 void *ptr; 59 void *ptr2; 60 unsigned int size; 61 errcode_t (*func)(struct field_set_info *info, char *field, char *arg); 62 int flags; 63 int max_idx; 64}; 65 66static errcode_t parse_uint(struct field_set_info *info, char *field, char *arg); 67static errcode_t parse_int(struct field_set_info *info, char *field, char *arg); 68static errcode_t parse_string(struct field_set_info *info, char *field, char *arg); 69static errcode_t parse_uuid(struct field_set_info *info, char *field, char *arg); 70static errcode_t parse_hashalg(struct field_set_info *info, char *field, char *arg); 71static errcode_t parse_time(struct field_set_info *info, char *field, char *arg); 72static errcode_t parse_bmap(struct field_set_info *info, char *field, char *arg); 73static errcode_t parse_gd_csum(struct field_set_info *info, char *field, char *arg); 74static errcode_t parse_mmp_clear(struct field_set_info *info, char *field, 75 char *arg); 76 77#pragma GCC diagnostic push 78#pragma GCC diagnostic ignored "-Wmissing-field-initializers" 79 80static struct field_set_info super_fields[] = { 81 { "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint }, 82 { "blocks_count", &set_sb.s_blocks_count, &set_sb.s_blocks_count_hi, 83 4, parse_uint }, 84 { "r_blocks_count", &set_sb.s_r_blocks_count, 85 &set_sb.s_r_blocks_count_hi, 4, parse_uint }, 86 { "free_blocks_count", &set_sb.s_free_blocks_count, 87 &set_sb.s_free_blocks_hi, 4, parse_uint }, 88 { "free_inodes_count", &set_sb.s_free_inodes_count, NULL, 4, parse_uint }, 89 { "first_data_block", &set_sb.s_first_data_block, NULL, 4, parse_uint }, 90 { "log_block_size", &set_sb.s_log_block_size, NULL, 4, parse_uint }, 91 { "log_cluster_size", &set_sb.s_log_cluster_size, NULL, 4, parse_int }, 92 { "blocks_per_group", &set_sb.s_blocks_per_group, NULL, 4, parse_uint }, 93 { "clusters_per_group", &set_sb.s_clusters_per_group, NULL, 4, parse_uint }, 94 { "inodes_per_group", &set_sb.s_inodes_per_group, NULL, 4, parse_uint }, 95 { "mtime", &set_sb.s_mtime, NULL, 4, parse_time }, 96 { "wtime", &set_sb.s_wtime, NULL, 4, parse_time }, 97 { "mnt_count", &set_sb.s_mnt_count, NULL, 2, parse_uint }, 98 { "max_mnt_count", &set_sb.s_max_mnt_count, NULL, 2, parse_int }, 99 /* s_magic */ 100 { "state", &set_sb.s_state, NULL, 2, parse_uint }, 101 { "errors", &set_sb.s_errors, NULL, 2, parse_uint }, 102 { "minor_rev_level", &set_sb.s_minor_rev_level, NULL, 2, parse_uint }, 103 { "lastcheck", &set_sb.s_lastcheck, NULL, 4, parse_time }, 104 { "checkinterval", &set_sb.s_checkinterval, NULL, 4, parse_uint }, 105 { "creator_os", &set_sb.s_creator_os, NULL, 4, parse_uint }, 106 { "rev_level", &set_sb.s_rev_level, NULL, 4, parse_uint }, 107 { "def_resuid", &set_sb.s_def_resuid, NULL, 2, parse_uint }, 108 { "def_resgid", &set_sb.s_def_resgid, NULL, 2, parse_uint }, 109 { "first_ino", &set_sb.s_first_ino, NULL, 4, parse_uint }, 110 { "inode_size", &set_sb.s_inode_size, NULL, 2, parse_uint }, 111 { "block_group_nr", &set_sb.s_block_group_nr, NULL, 2, parse_uint }, 112 { "feature_compat", &set_sb.s_feature_compat, NULL, 4, parse_uint }, 113 { "feature_incompat", &set_sb.s_feature_incompat, NULL, 4, parse_uint }, 114 { "feature_ro_compat", &set_sb.s_feature_ro_compat, NULL, 4, parse_uint }, 115 { "uuid", &set_sb.s_uuid, NULL, 16, parse_uuid }, 116 { "volume_name", &set_sb.s_volume_name, NULL, 16, parse_string }, 117 { "last_mounted", &set_sb.s_last_mounted, NULL, 64, parse_string }, 118 { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, NULL, 119 4, parse_uint }, 120 { "prealloc_blocks", &set_sb.s_prealloc_blocks, NULL, 1, parse_uint }, 121 { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, NULL, 1, 122 parse_uint }, 123 { "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, NULL, 2, 124 parse_uint }, 125 { "journal_uuid", &set_sb.s_journal_uuid, NULL, 16, parse_uuid }, 126 { "journal_inum", &set_sb.s_journal_inum, NULL, 4, parse_uint }, 127 { "journal_dev", &set_sb.s_journal_dev, NULL, 4, parse_uint }, 128 { "last_orphan", &set_sb.s_last_orphan, NULL, 4, parse_uint }, 129 { "hash_seed", &set_sb.s_hash_seed, NULL, 16, parse_uuid }, 130 { "def_hash_version", &set_sb.s_def_hash_version, NULL, 1, parse_hashalg }, 131 { "jnl_backup_type", &set_sb.s_jnl_backup_type, NULL, 1, parse_uint }, 132 { "desc_size", &set_sb.s_desc_size, NULL, 2, parse_uint }, 133 { "default_mount_opts", &set_sb.s_default_mount_opts, NULL, 4, parse_uint }, 134 { "first_meta_bg", &set_sb.s_first_meta_bg, NULL, 4, parse_uint }, 135 { "mkfs_time", &set_sb.s_mkfs_time, NULL, 4, parse_time }, 136 { "jnl_blocks", &set_sb.s_jnl_blocks[0], NULL, 4, parse_uint, FLAG_ARRAY, 137 17 }, 138 { "min_extra_isize", &set_sb.s_min_extra_isize, NULL, 2, parse_uint }, 139 { "want_extra_isize", &set_sb.s_want_extra_isize, NULL, 2, parse_uint }, 140 { "flags", &set_sb.s_flags, NULL, 4, parse_uint }, 141 { "raid_stride", &set_sb.s_raid_stride, NULL, 2, parse_uint }, 142 { "mmp_interval", &set_sb.s_mmp_update_interval, NULL, 2, parse_uint }, 143 { "mmp_block", &set_sb.s_mmp_block, NULL, 8, parse_uint }, 144 { "raid_stripe_width", &set_sb.s_raid_stripe_width, NULL, 4, parse_uint }, 145 { "log_groups_per_flex", &set_sb.s_log_groups_per_flex, NULL, 1, parse_uint }, 146 { "kbytes_written", &set_sb.s_kbytes_written, NULL, 8, parse_uint }, 147 { "snapshot_inum", &set_sb.s_snapshot_inum, NULL, 4, parse_uint }, 148 { "snapshot_id", &set_sb.s_snapshot_id, NULL, 4, parse_uint }, 149 { "snapshot_r_blocks_count", &set_sb.s_snapshot_r_blocks_count, 150 NULL, 8, parse_uint }, 151 { "snapshot_list", &set_sb.s_snapshot_list, NULL, 4, parse_uint }, 152 { "mount_opts", &set_sb.s_mount_opts, NULL, 64, parse_string }, 153 { "usr_quota_inum", &set_sb.s_usr_quota_inum, NULL, 4, parse_uint }, 154 { "grp_quota_inum", &set_sb.s_grp_quota_inum, NULL, 4, parse_uint }, 155 { "overhead_blocks", &set_sb.s_overhead_blocks, NULL, 4, parse_uint }, 156 { "backup_bgs", &set_sb.s_backup_bgs[0], NULL, 4, parse_uint, 157 FLAG_ARRAY, 2 }, 158 { "checksum", &set_sb.s_checksum, NULL, 4, parse_uint }, 159 { "checksum_type", &set_sb.s_checksum_type, NULL, 1, parse_uint }, 160 { "encryption_level", &set_sb.s_encryption_level, NULL, 1, parse_uint }, 161 { "error_count", &set_sb.s_error_count, NULL, 4, parse_uint }, 162 { "first_error_time", &set_sb.s_first_error_time, NULL, 4, parse_time }, 163 { "first_error_ino", &set_sb.s_first_error_ino, NULL, 4, parse_uint }, 164 { "first_error_block", &set_sb.s_first_error_block, NULL, 8, parse_uint }, 165 { "first_error_func", &set_sb.s_first_error_func, NULL, 32, parse_string }, 166 { "first_error_line", &set_sb.s_first_error_line, NULL, 4, parse_uint }, 167 { "last_error_time", &set_sb.s_last_error_time, NULL, 4, parse_time }, 168 { "last_error_ino", &set_sb.s_last_error_ino, NULL, 4, parse_uint }, 169 { "last_error_block", &set_sb.s_last_error_block, NULL, 8, parse_uint }, 170 { "last_error_func", &set_sb.s_last_error_func, NULL, 32, parse_string }, 171 { "last_error_line", &set_sb.s_last_error_line, NULL, 4, parse_uint }, 172 { "encrypt_algos", &set_sb.s_encrypt_algos, NULL, 1, parse_uint, 173 FLAG_ARRAY, 4 }, 174 { "encrypt_pw_salt", &set_sb.s_encrypt_pw_salt, NULL, 16, parse_uuid }, 175 { "lpf_ino", &set_sb.s_lpf_ino, NULL, 4, parse_uint }, 176 { 0, 0, 0, 0 } 177}; 178 179static struct field_set_info inode_fields[] = { 180 { "mode", &set_inode.i_mode, NULL, 2, parse_uint }, 181 { "uid", &set_inode.i_uid, &set_inode.osd2.linux2.l_i_uid_high, 182 2, parse_uint }, 183 { "size", &set_inode.i_size, &set_inode.i_size_high, 4, parse_uint }, 184 { "atime", &set_inode.i_atime, &set_inode.i_atime_extra, 185 4, parse_time }, 186 { "ctime", &set_inode.i_ctime, &set_inode.i_ctime_extra, 187 4, parse_time }, 188 { "mtime", &set_inode.i_mtime, &set_inode.i_mtime_extra, 189 4, parse_time }, 190 { "dtime", &set_inode.i_dtime, NULL, 191 4, parse_time }, 192 { "gid", &set_inode.i_gid, &set_inode.osd2.linux2.l_i_gid_high, 193 2, parse_uint }, 194 { "links_count", &set_inode.i_links_count, NULL, 2, parse_uint }, 195 /* Special case: i_blocks is 4 bytes, i_blocks_high is 2 bytes */ 196 { "blocks", &set_inode.i_blocks, &set_inode.osd2.linux2.l_i_blocks_hi, 197 6, parse_uint }, 198 { "flags", &set_inode.i_flags, NULL, 4, parse_uint }, 199 { "version", &set_inode.osd1.linux1.l_i_version, 200 &set_inode.i_version_hi, 4, parse_uint }, 201 { "translator", &set_inode.osd1.hurd1.h_i_translator, NULL, 202 4, parse_uint, FLAG_ALIAS }, 203 { "block", &set_inode.i_block[0], NULL, 4, parse_uint, FLAG_ARRAY, 204 EXT2_NDIR_BLOCKS }, 205 { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], NULL, 4, parse_uint }, 206 { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], NULL, 4, parse_uint }, 207 { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], NULL, 4, parse_uint }, 208 { "generation", &set_inode.i_generation, NULL, 4, parse_uint }, 209 /* Special case: i_file_acl_high is 2 bytes */ 210 { "file_acl", &set_inode.i_file_acl, 211 &set_inode.osd2.linux2.l_i_file_acl_high, 6, parse_uint }, 212 { "dir_acl", &set_inode.i_dir_acl, NULL, 4, parse_uint, FLAG_ALIAS }, 213 { "faddr", &set_inode.i_faddr, NULL, 4, parse_uint }, 214 { "frag", &set_inode.osd2.hurd2.h_i_frag, NULL, 1, parse_uint, FLAG_ALIAS }, 215 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, NULL, 1, parse_uint }, 216 { "checksum", &set_inode.osd2.linux2.l_i_checksum_lo, 217 &set_inode.i_checksum_hi, 2, parse_uint }, 218 { "author", &set_inode.osd2.hurd2.h_i_author, NULL, 219 4, parse_uint, FLAG_ALIAS }, 220 { "extra_isize", &set_inode.i_extra_isize, NULL, 221 2, parse_uint }, 222 { "ctime_extra", &set_inode.i_ctime_extra, NULL, 223 4, parse_uint, FLAG_ALIAS }, 224 { "mtime_extra", &set_inode.i_mtime_extra, NULL, 225 4, parse_uint, FLAG_ALIAS }, 226 { "atime_extra", &set_inode.i_atime_extra, NULL, 227 4, parse_uint, FLAG_ALIAS }, 228 { "crtime", &set_inode.i_crtime, &set_inode.i_crtime_extra, 229 4, parse_time }, 230 { "crtime_extra", &set_inode.i_crtime_extra, NULL, 231 4, parse_uint, FLAG_ALIAS }, 232 { "bmap", NULL, NULL, 4, parse_bmap, FLAG_ARRAY }, 233 { 0, 0, 0, 0 } 234}; 235 236static struct field_set_info ext2_bg_fields[] = { 237 { "block_bitmap", &set_gd.bg_block_bitmap, NULL, 4, parse_uint }, 238 { "inode_bitmap", &set_gd.bg_inode_bitmap, NULL, 4, parse_uint }, 239 { "inode_table", &set_gd.bg_inode_table, NULL, 4, parse_uint }, 240 { "free_blocks_count", &set_gd.bg_free_blocks_count, NULL, 2, parse_uint }, 241 { "free_inodes_count", &set_gd.bg_free_inodes_count, NULL, 2, parse_uint }, 242 { "used_dirs_count", &set_gd.bg_used_dirs_count, NULL, 2, parse_uint }, 243 { "flags", &set_gd.bg_flags, NULL, 2, parse_uint }, 244 { "itable_unused", &set_gd.bg_itable_unused, NULL, 2, parse_uint }, 245 { "checksum", &set_gd.bg_checksum, NULL, 2, parse_gd_csum }, 246 { 0, 0, 0, 0 } 247}; 248 249static struct field_set_info ext4_bg_fields[] = { 250 { "block_bitmap", &set_gd4.bg_block_bitmap, 251 &set_gd4.bg_block_bitmap_hi, 4, parse_uint }, 252 { "inode_bitmap", &set_gd4.bg_inode_bitmap, 253 &set_gd4.bg_inode_bitmap_hi, 4, parse_uint }, 254 { "inode_table", &set_gd4.bg_inode_table, 255 &set_gd4.bg_inode_table_hi, 4, parse_uint }, 256 { "free_blocks_count", &set_gd4.bg_free_blocks_count, 257 &set_gd4.bg_free_blocks_count_hi, 2, parse_uint }, 258 { "free_inodes_count", &set_gd4.bg_free_inodes_count, 259 &set_gd4.bg_free_inodes_count_hi, 2, parse_uint }, 260 { "used_dirs_count", &set_gd4.bg_used_dirs_count, 261 &set_gd4.bg_used_dirs_count_hi, 2, parse_uint }, 262 { "flags", &set_gd4.bg_flags, NULL, 2, parse_uint }, 263 { "exclude_bitmap", &set_gd4.bg_exclude_bitmap_lo, 264 &set_gd4.bg_exclude_bitmap_hi, 4, parse_uint }, 265 { "block_bitmap_csum", &set_gd4.bg_block_bitmap_csum_lo, 266 &set_gd4.bg_block_bitmap_csum_hi, 2, parse_uint }, 267 { "inode_bitmap_csum", &set_gd4.bg_inode_bitmap_csum_lo, 268 &set_gd4.bg_inode_bitmap_csum_hi, 2, parse_uint }, 269 { "itable_unused", &set_gd4.bg_itable_unused, 270 &set_gd4.bg_itable_unused_hi, 2, parse_uint }, 271 { "checksum", &set_gd4.bg_checksum, NULL, 2, parse_gd_csum }, 272 { 0, 0, 0, 0 } 273}; 274 275static struct field_set_info mmp_fields[] = { 276 { "clear", &set_mmp.mmp_magic, NULL, sizeof(set_mmp), 277 parse_mmp_clear, FLAG_ALIAS }, 278 { "magic", &set_mmp.mmp_magic, NULL, 4, parse_uint }, 279 { "seq", &set_mmp.mmp_seq, NULL, 4, parse_uint }, 280 { "time", &set_mmp.mmp_time, NULL, 8, parse_uint }, 281 { "nodename", &set_mmp.mmp_nodename, NULL, sizeof(set_mmp.mmp_nodename), 282 parse_string }, 283 { "bdevname", &set_mmp.mmp_bdevname, NULL, sizeof(set_mmp.mmp_bdevname), 284 parse_string }, 285 { "check_interval", &set_mmp.mmp_check_interval, NULL, 2, parse_uint }, 286 { "checksum", &set_mmp.mmp_checksum, NULL, 4, parse_uint }, 287 { 0, 0, 0, 0 } 288}; 289#pragma GCC diagnostic pop 290 291#ifdef UNITTEST 292 293 294static void do_verify_field_set_info(struct field_set_info *fields, 295 const void *data, size_t size) 296{ 297 struct field_set_info *ss, *ss2; 298 const char *begin = (char *)data; 299 const char *end = begin + size; 300 301 for (ss = fields ; ss->name ; ss++) { 302 const char *ptr; 303 304 /* Check pointers */ 305 ptr = ss->ptr; 306 assert(!ptr || (ptr >= begin && ptr < end)); 307 ptr = ss->ptr2; 308 assert(!ptr || (ptr >= begin && ptr < end)); 309 310 /* Check function */ 311 assert(ss->func); 312 313 for (ss2 = fields ; ss2 != ss ; ss2++) { 314 /* Check duplicate names */ 315 assert(strcmp(ss->name, ss2->name)); 316 317 if (ss->flags & FLAG_ALIAS || ss2->flags & FLAG_ALIAS) 318 continue; 319 /* Check false aliases, might be copy-n-paste error */ 320 assert(!ss->ptr || (ss->ptr != ss2->ptr && 321 ss->ptr != ss2->ptr2)); 322 assert(!ss->ptr2 || (ss->ptr2 != ss2->ptr && 323 ss->ptr2 != ss2->ptr2)); 324 } 325 } 326} 327 328int main(int argc, char **argv) 329{ 330 do_verify_field_set_info(super_fields, &set_sb, sizeof(set_sb)); 331 do_verify_field_set_info(inode_fields, &set_inode, sizeof(set_inode)); 332 do_verify_field_set_info(ext2_bg_fields, &set_gd, sizeof(set_gd)); 333 do_verify_field_set_info(ext4_bg_fields, &set_gd4, sizeof(set_gd4)); 334 do_verify_field_set_info(mmp_fields, &set_mmp, sizeof(set_mmp)); 335 return 0; 336} 337 338ext2_filsys current_fs; 339ext2_ino_t root, cwd; 340 341#endif /* UNITTEST */ 342 343static int check_suffix(const char *field) 344{ 345 int len = strlen(field); 346 347 if (len <= 3) 348 return 0; 349 field += len-3; 350 if (!strcmp(field, "_lo")) 351 return 1; 352 if (!strcmp(field, "_hi")) 353 return 2; 354 return 0; 355} 356 357static struct field_set_info *find_field(struct field_set_info *fields, 358 char *field) 359{ 360 struct field_set_info *ss; 361 const char *prefix; 362 char *arg, *delim, *idx, *tmp; 363 int suffix, prefix_len; 364 365 if (fields == super_fields) 366 prefix = "s_"; 367 else if (fields == inode_fields) 368 prefix = "i_"; 369 else 370 prefix = "bg_"; 371 prefix_len = strlen(prefix); 372 if (strncmp(field, prefix, prefix_len) == 0) 373 field += prefix_len; 374 375 arg = malloc(strlen(field)+1); 376 if (!arg) 377 return NULL; 378 strcpy(arg, field); 379 380 idx = strchr(arg, '['); 381 if (idx) { 382 *idx++ = 0; 383 delim = idx + strlen(idx) - 1; 384 if (!*idx || *delim != ']') 385 idx = 0; 386 else 387 *delim = 0; 388 } 389 /* 390 * Can we parse the number? 391 */ 392 if (idx) { 393 array_idx = strtol(idx, &tmp, 0); 394 if (*tmp) { 395 *(--idx) = '['; 396 *delim = ']'; 397 idx = 0; 398 } 399 } 400 401 /* 402 * If there is a valid _hi or a _lo suffix, strip it off 403 */ 404 suffix = check_suffix(arg); 405 if (suffix > 0) 406 arg[strlen(arg)-3] = 0; 407 408 for (ss = fields ; ss->name ; ss++) { 409 if (suffix && ss->ptr2 == 0) 410 continue; 411 if (ss->flags & FLAG_ARRAY) { 412 if (!idx || (strcmp(ss->name, arg) != 0)) 413 continue; 414 if (ss->max_idx > 0 && array_idx >= ss->max_idx) 415 continue; 416 } else { 417 if (strcmp(ss->name, arg) != 0) 418 continue; 419 } 420 free(arg); 421 return ss; 422 } 423 free(arg); 424 return NULL; 425} 426 427/* 428 * Note: info->size == 6 is special; this means a base size 4 bytes, 429 * and secondiory (high) size of 2 bytes. This is needed for the 430 * special case of i_blocks_high and i_file_acl_high. 431 */ 432static errcode_t parse_uint(struct field_set_info *info, char *field, 433 char *arg) 434{ 435 unsigned long long n, num, mask, limit; 436 int suffix = check_suffix(field); 437 char *tmp; 438 void *field1 = info->ptr, *field2 = info->ptr2; 439 int size = (info->size == 6) ? 4 : info->size; 440 union { 441 __u64 *ptr64; 442 __u32 *ptr32; 443 __u16 *ptr16; 444 __u8 *ptr8; 445 } u; 446 447 if (suffix == 1) 448 field2 = 0; 449 if (suffix == 2) { 450 field1 = field2; 451 field2 = 0; 452 } 453 454 u.ptr8 = (__u8 *) field1; 455 if (info->flags & FLAG_ARRAY) 456 u.ptr8 += array_idx * info->size; 457 458 errno = 0; 459 num = STRTOULL(arg, &tmp, 0); 460 if (*tmp || errno) { 461 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 462 arg, info->name); 463 return EINVAL; 464 } 465 mask = ~0ULL >> ((8 - size) * 8); 466 limit = ~0ULL >> ((8 - info->size) * 8); 467 if (field2 && info->size != 6) 468 limit = ~0ULL >> ((8 - info->size*2) * 8); 469 470 if (num > limit) { 471 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n", 472 arg, info->name, limit); 473 return EINVAL; 474 } 475 n = num & mask; 476 switch (size) { 477 case 8: 478 /* Should never get here */ 479 fprintf(stderr, "64-bit field %s has a second 64-bit field\n" 480 "defined; BUG?!?\n", info->name); 481 *u.ptr64 = 0; 482 break; 483 case 4: 484 *u.ptr32 = n; 485 break; 486 case 2: 487 *u.ptr16 = n; 488 break; 489 case 1: 490 *u.ptr8 = n; 491 break; 492 } 493 if (!field2) 494 return 0; 495 n = num >> (size*8); 496 u.ptr8 = (__u8 *) field2; 497 if (info->size == 6) 498 size = 2; 499 switch (size) { 500 case 8: 501 *u.ptr64 = n; 502 break; 503 case 4: 504 *u.ptr32 = n; 505 break; 506 case 2: 507 *u.ptr16 = n; 508 break; 509 case 1: 510 *u.ptr8 = n; 511 break; 512 } 513 return 0; 514} 515 516static errcode_t parse_int(struct field_set_info *info, 517 char *field EXT2FS_ATTR((unused)), char *arg) 518{ 519 long num; 520 char *tmp; 521 __s32 *ptr32; 522 __s16 *ptr16; 523 __s8 *ptr8; 524 525 num = strtol(arg, &tmp, 0); 526 if (*tmp) { 527 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 528 arg, info->name); 529 return EINVAL; 530 } 531 switch (info->size) { 532 case 4: 533 ptr32 = (__s32 *) info->ptr; 534 *ptr32 = num; 535 break; 536 case 2: 537 ptr16 = (__s16 *) info->ptr; 538 *ptr16 = num; 539 break; 540 case 1: 541 ptr8 = (__s8 *) info->ptr; 542 *ptr8 = num; 543 break; 544 } 545 return 0; 546} 547 548static errcode_t parse_string(struct field_set_info *info, 549 char *field EXT2FS_ATTR((unused)), char *arg) 550{ 551 char *cp = (char *) info->ptr; 552 553 if (strlen(arg) >= info->size) { 554 fprintf(stderr, "Error maximum size for %s is %d.\n", 555 info->name, info->size); 556 return EINVAL; 557 } 558 strcpy(cp, arg); 559 return 0; 560} 561 562static errcode_t parse_time(struct field_set_info *info, 563 char *field, char *arg) 564{ 565 __s64 t; 566 __u32 t_low, t_high; 567 __u32 *ptr_low, *ptr_high; 568 int suffix = check_suffix(field); 569 570 if (check_suffix(field)) 571 return parse_uint(info, field, arg); 572 573 ptr_low = (__u32 *) info->ptr; 574 ptr_high = (__u32 *) info->ptr2; 575 576 t = string_to_time(arg); 577 578 if (t == -1) { 579 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 580 arg, info->name); 581 return EINVAL; 582 } 583 t_low = (__u32) t; 584 t_high = ((t - (__s32)t) >> 32) & EXT4_EPOCH_MASK; 585 *ptr_low = t_low; 586 if (ptr_high) 587 *ptr_high = (*ptr_high & ~EXT4_EPOCH_MASK) | t_high; 588 return 0; 589} 590 591static errcode_t parse_uuid(struct field_set_info *info, 592 char *field EXT2FS_ATTR((unused)), char *arg) 593{ 594 unsigned char * p = (unsigned char *) info->ptr; 595 596 if ((strcasecmp(arg, "null") == 0) || 597 (strcasecmp(arg, "clear") == 0)) { 598 uuid_clear(p); 599 } else if (strcasecmp(arg, "time") == 0) { 600 uuid_generate_time(p); 601 } else if (strcasecmp(arg, "random") == 0) { 602 uuid_generate(p); 603 } else if (uuid_parse(arg, p)) { 604 fprintf(stderr, "Invalid UUID format: %s\n", arg); 605 return EINVAL; 606 } 607 return 0; 608} 609 610static errcode_t parse_hashalg(struct field_set_info *info, 611 char *field EXT2FS_ATTR((unused)), char *arg) 612{ 613 int hashv; 614 unsigned char *p = (unsigned char *) info->ptr; 615 616 hashv = e2p_string2hash(arg); 617 if (hashv < 0) { 618 fprintf(stderr, "Invalid hash algorithm: %s\n", arg); 619 return EINVAL; 620 } 621 *p = hashv; 622 return 0; 623} 624 625static errcode_t parse_bmap(struct field_set_info *info, 626 char *field EXT2FS_ATTR((unused)), char *arg) 627{ 628 blk64_t blk; 629 errcode_t retval; 630 char *tmp; 631 632 blk = strtoull(arg, &tmp, 0); 633 if (*tmp) { 634 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 635 arg, info->name); 636 return EINVAL; 637 } 638 639 retval = ext2fs_bmap2(current_fs, set_ino, 640 (struct ext2_inode *) &set_inode, 641 NULL, BMAP_ALLOC | BMAP_SET, array_idx, NULL, 642 &blk); 643 if (retval) { 644 com_err("set_inode", retval, "while setting block map"); 645 } 646 return retval; 647} 648 649static errcode_t parse_gd_csum(struct field_set_info *info, char *field, 650 char *arg) 651{ 652 653 if (strcmp(arg, "calc") == 0) { 654 ext2fs_group_desc_csum_set(current_fs, set_bg); 655 memcpy(&set_gd, ext2fs_group_desc(current_fs, 656 current_fs->group_desc, 657 set_bg), 658 sizeof(set_gd)); 659 printf("Checksum set to 0x%04x\n", 660 ext2fs_bg_checksum(current_fs, set_bg)); 661 return 0; 662 } 663 664 return parse_uint(info, field, arg); 665} 666 667static void print_possible_fields(struct field_set_info *fields) 668{ 669 struct field_set_info *ss; 670 const char *type, *cmd; 671 FILE *f; 672 char name[40], idx[40]; 673 674 if (fields == super_fields) { 675 type = "Superblock"; 676 cmd = "set_super_value"; 677 } else if (fields == inode_fields) { 678 type = "Inode"; 679 cmd = "set_inode"; 680 } else if (fields == mmp_fields) { 681 type = "MMP"; 682 cmd = "set_mmp_value"; 683 } else { 684 type = "Block group descriptor"; 685 cmd = "set_block_group"; 686 } 687 f = open_pager(); 688 689 fprintf(f, "%s fields supported by the %s command:\n", type, cmd); 690 691 for (ss = fields ; ss->name ; ss++) { 692 type = "unknown"; 693 if (ss->func == parse_string) 694 type = "string"; 695 else if (ss->func == parse_int) 696 type = "integer"; 697 else if (ss->func == parse_uint) 698 type = "unsigned integer"; 699 else if (ss->func == parse_uuid) 700 type = "UUID"; 701 else if (ss->func == parse_hashalg) 702 type = "hash algorithm"; 703 else if (ss->func == parse_time) 704 type = "date/time"; 705 else if (ss->func == parse_bmap) 706 type = "set physical->logical block map"; 707 else if (ss->func == parse_gd_csum) 708 type = "unsigned integer OR \"calc\""; 709 strcpy(name, ss->name); 710 if (ss->flags & FLAG_ARRAY) { 711 if (ss->max_idx > 0) 712 sprintf(idx, "[%d]", ss->max_idx); 713 else 714 strcpy(idx, "[]"); 715 strcat(name, idx); 716 } 717 if (ss->ptr2) 718 strcat(name, "[_hi|_lo]"); 719 fprintf(f, "\t%-25s\t%s\n", name, type); 720 } 721 close_pager(f); 722} 723 724 725void do_set_super(int argc, char *argv[]) 726{ 727 const char *usage = "<field> <value>\n" 728 "\t\"set_super_value -l\" will list the names of " 729 "superblock fields\n\twhich can be set."; 730 static struct field_set_info *ss; 731 732 if ((argc == 2) && !strcmp(argv[1], "-l")) { 733 print_possible_fields(super_fields); 734 return; 735 } 736 737 if (common_args_process(argc, argv, 3, 3, "set_super_value", 738 usage, CHECK_FS_RW)) 739 return; 740 741 if ((ss = find_field(super_fields, argv[1])) == 0) { 742 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); 743 return; 744 } 745 set_sb = *current_fs->super; 746 if (ss->func(ss, argv[1], argv[2]) == 0) { 747 *current_fs->super = set_sb; 748 ext2fs_mark_super_dirty(current_fs); 749 } 750} 751 752void do_set_inode(int argc, char *argv[]) 753{ 754 const char *usage = "<inode> <field> <value>\n" 755 "\t\"set_inode_field -l\" will list the names of " 756 "the fields in an ext2 inode\n\twhich can be set."; 757 static struct field_set_info *ss; 758 759 if ((argc == 2) && !strcmp(argv[1], "-l")) { 760 print_possible_fields(inode_fields); 761 return; 762 } 763 764 if (common_args_process(argc, argv, 4, 4, "set_inode", 765 usage, CHECK_FS_RW)) 766 return; 767 768 if ((ss = find_field(inode_fields, argv[2])) == 0) { 769 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 770 return; 771 } 772 773 set_ino = string_to_inode(argv[1]); 774 if (!set_ino) 775 return; 776 777 if (debugfs_read_inode_full(set_ino, 778 (struct ext2_inode *) &set_inode, argv[1], 779 sizeof(set_inode))) 780 return; 781 782 if (ss->func(ss, argv[2], argv[3]) == 0) { 783 if (debugfs_write_inode_full(set_ino, 784 (struct ext2_inode *) &set_inode, 785 argv[1], sizeof(set_inode))) 786 return; 787 } 788} 789 790void do_set_block_group_descriptor(int argc, char *argv[]) 791{ 792 const char *usage = "<bg number> <field> <value>\n" 793 "\t\"set_block_group_descriptor -l\" will list the names of " 794 "the fields in a block group descriptor\n\twhich can be set."; 795 struct field_set_info *table; 796 struct field_set_info *ss; 797 char *end; 798 void *edit, *target; 799 int size; 800 801 /* 802 * Determine whether we are editing an ext2 or ext4 block group 803 * descriptor. Descriptors larger than ext4_group_desc cannot 804 * have their fields edited yet, because they do not have any 805 * names assigned. When that happens, this function needs to 806 * be updated for the new descriptor struct and fields. 807 */ 808 if (current_fs && 809 EXT2_DESC_SIZE(current_fs->super) >= EXT2_MIN_DESC_SIZE_64BIT) { 810 table = ext4_bg_fields; 811 edit = &set_gd4; 812 size = sizeof(set_gd4); 813 } else { 814 table = ext2_bg_fields; 815 edit = &set_gd; 816 size = sizeof(set_gd); 817 } 818 819 if ((argc == 2) && !strcmp(argv[1], "-l")) { 820 print_possible_fields(table); 821 return; 822 } 823 824 if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor", 825 usage, CHECK_FS_RW)) 826 return; 827 828 set_bg = strtoul(argv[1], &end, 0); 829 if (*end) { 830 com_err(argv[0], 0, "invalid block group number: %s", argv[1]); 831 return; 832 } 833 834 if (set_bg >= current_fs->group_desc_count) { 835 com_err(argv[0], 0, "block group number too big: %d", set_bg); 836 return; 837 } 838 839 if ((ss = find_field(table, argv[2])) == 0) { 840 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 841 return; 842 } 843 844 target = ext2fs_group_desc(current_fs, current_fs->group_desc, set_bg); 845 memcpy(edit, target, size); 846 if (ss->func(ss, argv[2], argv[3]) == 0) { 847 memcpy(target, edit, size); 848 ext2fs_mark_super_dirty(current_fs); 849 } 850} 851 852static errcode_t parse_mmp_clear(struct field_set_info *info, 853 char *field EXT2FS_ATTR((unused)), 854 char *arg EXT2FS_ATTR((unused))) 855{ 856 errcode_t retval; 857 858 retval = ext2fs_mmp_clear(current_fs); 859 if (retval != 0) 860 com_err("set_mmp_value", retval, "while clearing MMP block\n"); 861 else 862 memcpy(info->ptr, current_fs->mmp_buf, info->size); 863 864 return 1; /* we don't need the MMP block written again */ 865} 866 867#ifdef CONFIG_MMP 868void do_set_mmp_value(int argc, char *argv[]) 869{ 870 const char *usage = "<field> <value>\n" 871 "\t\"set_mmp_value -l\" will list the names of " 872 "MMP fields\n\twhich can be set."; 873 static struct field_set_info *smmp; 874 struct mmp_struct *mmp_s; 875 errcode_t retval; 876 877 if (argc == 2 && strcmp(argv[1], "-l") == 0) { 878 print_possible_fields(mmp_fields); 879 return; 880 } 881 882 if (check_fs_open(argv[0])) 883 return; 884 885 if (current_fs->super->s_mmp_block == 0) { 886 com_err(argv[0], 0, "no MMP block allocated\n"); 887 return; 888 } 889 890 if (common_args_process(argc, argv, 2, 3, "set_mmp_value", 891 usage, CHECK_FS_RW)) 892 return; 893 894 mmp_s = current_fs->mmp_buf; 895 if (mmp_s == NULL) { 896 retval = ext2fs_get_mem(current_fs->blocksize, &mmp_s); 897 if (retval) { 898 com_err(argv[0], retval, "allocating MMP buffer\n"); 899 return; 900 } 901 retval = ext2fs_mmp_read(current_fs, 902 current_fs->super->s_mmp_block, mmp_s); 903 if (retval) { 904 com_err(argv[0], retval, "reading MMP block %llu.\n", 905 (long long)current_fs->super->s_mmp_block); 906 ext2fs_free_mem(&mmp_s); 907 return; 908 } 909 current_fs->mmp_buf = mmp_s; 910 } 911 912 smmp = find_field(mmp_fields, argv[1]); 913 if (smmp == 0) { 914 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); 915 return; 916 } 917 918 set_mmp = *mmp_s; 919 if (smmp->func(smmp, argv[1], argv[2]) == 0) { 920 ext2fs_mmp_write(current_fs, current_fs->super->s_mmp_block, 921 &set_mmp); 922 *mmp_s = set_mmp; 923 } 924} 925#else 926void do_set_mmp_value(int argc EXT2FS_ATTR((unused)), 927 char *argv[] EXT2FS_ATTR((unused))) 928{ 929 fprintf(stdout, "MMP is unsupported, please recompile with " 930 "--enable-mmp\n"); 931} 932#endif 933 934