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 #include "support/quotaio.h" 44 45 static struct ext2_super_block set_sb; 46 static struct ext2_inode_large set_inode; 47 static struct ext2_group_desc set_gd; 48 static struct ext4_group_desc set_gd4; 49 static struct mmp_struct set_mmp; 50 static dgrp_t set_bg; 51 static ext2_ino_t set_ino; 52 static int array_idx; 53 54 #define FLAG_ARRAY 0x0001 55 #define FLAG_ALIAS 0x0002 /* Data intersects with other field */ 56 57 struct field_set_info { 58 const char *name; 59 void *ptr; 60 void *ptr2; 61 unsigned int size; 62 errcode_t (*func)(struct field_set_info *info, char *field, char *arg); 63 int flags; 64 int max_idx; 65 }; 66 67 static errcode_t parse_uint(struct field_set_info *info, char *field, char *arg); 68 static errcode_t parse_int(struct field_set_info *info, char *field, char *arg); 69 static errcode_t parse_string(struct field_set_info *info, char *field, char *arg); 70 static errcode_t parse_uuid(struct field_set_info *info, char *field, char *arg); 71 static errcode_t parse_hashalg(struct field_set_info *info, char *field, char *arg); 72 static errcode_t parse_time(struct field_set_info *info, char *field, char *arg); 73 static errcode_t parse_bmap(struct field_set_info *info, char *field, char *arg); 74 static errcode_t parse_gd_csum(struct field_set_info *info, char *field, char *arg); 75 static errcode_t parse_mmp_clear(struct field_set_info *info, char *field, 76 char *arg); 77 78 #if __GNUC_PREREQ (4, 6) || defined(__clang__) 79 #pragma GCC diagnostic push 80 #pragma GCC diagnostic ignored "-Wmissing-field-initializers" 81 #endif 82 83 static struct field_set_info super_fields[] = { 84 { "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint }, 85 { "blocks_count", &set_sb.s_blocks_count, &set_sb.s_blocks_count_hi, 86 4, parse_uint }, 87 { "r_blocks_count", &set_sb.s_r_blocks_count, 88 &set_sb.s_r_blocks_count_hi, 4, parse_uint }, 89 { "free_blocks_count", &set_sb.s_free_blocks_count, 90 &set_sb.s_free_blocks_hi, 4, parse_uint }, 91 { "free_inodes_count", &set_sb.s_free_inodes_count, NULL, 4, parse_uint }, 92 { "first_data_block", &set_sb.s_first_data_block, NULL, 4, parse_uint }, 93 { "log_block_size", &set_sb.s_log_block_size, NULL, 4, parse_uint }, 94 { "log_cluster_size", &set_sb.s_log_cluster_size, NULL, 4, parse_int }, 95 { "blocks_per_group", &set_sb.s_blocks_per_group, NULL, 4, parse_uint }, 96 { "clusters_per_group", &set_sb.s_clusters_per_group, NULL, 4, parse_uint }, 97 { "inodes_per_group", &set_sb.s_inodes_per_group, NULL, 4, parse_uint }, 98 { "mtime", &set_sb.s_mtime, NULL, 4, parse_time }, 99 { "wtime", &set_sb.s_wtime, NULL, 4, parse_time }, 100 { "mnt_count", &set_sb.s_mnt_count, NULL, 2, parse_uint }, 101 { "max_mnt_count", &set_sb.s_max_mnt_count, NULL, 2, parse_int }, 102 /* s_magic */ 103 { "state", &set_sb.s_state, NULL, 2, parse_uint }, 104 { "errors", &set_sb.s_errors, NULL, 2, parse_uint }, 105 { "minor_rev_level", &set_sb.s_minor_rev_level, NULL, 2, parse_uint }, 106 { "lastcheck", &set_sb.s_lastcheck, NULL, 4, parse_time }, 107 { "checkinterval", &set_sb.s_checkinterval, NULL, 4, parse_uint }, 108 { "creator_os", &set_sb.s_creator_os, NULL, 4, parse_uint }, 109 { "rev_level", &set_sb.s_rev_level, NULL, 4, parse_uint }, 110 { "def_resuid", &set_sb.s_def_resuid, NULL, 2, parse_uint }, 111 { "def_resgid", &set_sb.s_def_resgid, NULL, 2, parse_uint }, 112 { "first_ino", &set_sb.s_first_ino, NULL, 4, parse_uint }, 113 { "inode_size", &set_sb.s_inode_size, NULL, 2, parse_uint }, 114 { "block_group_nr", &set_sb.s_block_group_nr, NULL, 2, parse_uint }, 115 { "feature_compat", &set_sb.s_feature_compat, NULL, 4, parse_uint }, 116 { "feature_incompat", &set_sb.s_feature_incompat, NULL, 4, parse_uint }, 117 { "feature_ro_compat", &set_sb.s_feature_ro_compat, NULL, 4, parse_uint }, 118 { "uuid", &set_sb.s_uuid, NULL, 16, parse_uuid }, 119 { "volume_name", &set_sb.s_volume_name, NULL, 16, parse_string }, 120 { "last_mounted", &set_sb.s_last_mounted, NULL, 64, parse_string }, 121 { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, NULL, 122 4, parse_uint }, 123 { "prealloc_blocks", &set_sb.s_prealloc_blocks, NULL, 1, parse_uint }, 124 { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, NULL, 1, 125 parse_uint }, 126 { "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, NULL, 2, 127 parse_uint }, 128 { "journal_uuid", &set_sb.s_journal_uuid, NULL, 16, parse_uuid }, 129 { "journal_inum", &set_sb.s_journal_inum, NULL, 4, parse_uint }, 130 { "journal_dev", &set_sb.s_journal_dev, NULL, 4, parse_uint }, 131 { "last_orphan", &set_sb.s_last_orphan, NULL, 4, parse_uint }, 132 { "hash_seed", &set_sb.s_hash_seed, NULL, 16, parse_uuid }, 133 { "def_hash_version", &set_sb.s_def_hash_version, NULL, 1, parse_hashalg }, 134 { "jnl_backup_type", &set_sb.s_jnl_backup_type, NULL, 1, parse_uint }, 135 { "desc_size", &set_sb.s_desc_size, NULL, 2, parse_uint }, 136 { "default_mount_opts", &set_sb.s_default_mount_opts, NULL, 4, parse_uint }, 137 { "first_meta_bg", &set_sb.s_first_meta_bg, NULL, 4, parse_uint }, 138 { "mkfs_time", &set_sb.s_mkfs_time, NULL, 4, parse_time }, 139 { "jnl_blocks", &set_sb.s_jnl_blocks[0], NULL, 4, parse_uint, FLAG_ARRAY, 140 17 }, 141 { "min_extra_isize", &set_sb.s_min_extra_isize, NULL, 2, parse_uint }, 142 { "want_extra_isize", &set_sb.s_want_extra_isize, NULL, 2, parse_uint }, 143 { "flags", &set_sb.s_flags, NULL, 4, parse_uint }, 144 { "raid_stride", &set_sb.s_raid_stride, NULL, 2, parse_uint }, 145 { "mmp_interval", &set_sb.s_mmp_update_interval, NULL, 2, parse_uint }, 146 { "mmp_block", &set_sb.s_mmp_block, NULL, 8, parse_uint }, 147 { "raid_stripe_width", &set_sb.s_raid_stripe_width, NULL, 4, parse_uint }, 148 { "log_groups_per_flex", &set_sb.s_log_groups_per_flex, NULL, 1, parse_uint }, 149 { "kbytes_written", &set_sb.s_kbytes_written, NULL, 8, parse_uint }, 150 { "snapshot_inum", &set_sb.s_snapshot_inum, NULL, 4, parse_uint }, 151 { "snapshot_id", &set_sb.s_snapshot_id, NULL, 4, parse_uint }, 152 { "snapshot_r_blocks_count", &set_sb.s_snapshot_r_blocks_count, 153 NULL, 8, parse_uint }, 154 { "snapshot_list", &set_sb.s_snapshot_list, NULL, 4, parse_uint }, 155 { "mount_opts", &set_sb.s_mount_opts, NULL, 64, parse_string }, 156 { "usr_quota_inum", &set_sb.s_usr_quota_inum, NULL, 4, parse_uint }, 157 { "grp_quota_inum", &set_sb.s_grp_quota_inum, NULL, 4, parse_uint }, 158 { "prj_quota_inum", &set_sb.s_prj_quota_inum, NULL, 4, parse_uint }, 159 { "overhead_blocks", &set_sb.s_overhead_blocks, NULL, 4, parse_uint }, 160 { "backup_bgs", &set_sb.s_backup_bgs[0], NULL, 4, parse_uint, 161 FLAG_ARRAY, 2 }, 162 { "checksum", &set_sb.s_checksum, NULL, 4, parse_uint }, 163 { "checksum_type", &set_sb.s_checksum_type, NULL, 1, parse_uint }, 164 { "encryption_level", &set_sb.s_encryption_level, NULL, 1, parse_uint }, 165 { "error_count", &set_sb.s_error_count, NULL, 4, parse_uint }, 166 { "first_error_time", &set_sb.s_first_error_time, NULL, 4, parse_time }, 167 { "first_error_ino", &set_sb.s_first_error_ino, NULL, 4, parse_uint }, 168 { "first_error_block", &set_sb.s_first_error_block, NULL, 8, parse_uint }, 169 { "first_error_func", &set_sb.s_first_error_func, NULL, 32, parse_string }, 170 { "first_error_line", &set_sb.s_first_error_line, NULL, 4, parse_uint }, 171 { "last_error_time", &set_sb.s_last_error_time, NULL, 4, parse_time }, 172 { "last_error_ino", &set_sb.s_last_error_ino, NULL, 4, parse_uint }, 173 { "last_error_block", &set_sb.s_last_error_block, NULL, 8, parse_uint }, 174 { "last_error_func", &set_sb.s_last_error_func, NULL, 32, parse_string }, 175 { "last_error_line", &set_sb.s_last_error_line, NULL, 4, parse_uint }, 176 { "encrypt_algos", &set_sb.s_encrypt_algos, NULL, 1, parse_uint, 177 FLAG_ARRAY, 4 }, 178 { "encrypt_pw_salt", &set_sb.s_encrypt_pw_salt, NULL, 16, parse_uuid }, 179 { "lpf_ino", &set_sb.s_lpf_ino, NULL, 4, parse_uint }, 180 { "checksum_seed", &set_sb.s_checksum_seed, NULL, 4, parse_uint }, 181 { 0, 0, 0, 0 } 182 }; 183 184 static struct field_set_info inode_fields[] = { 185 { "mode", &set_inode.i_mode, NULL, 2, parse_uint }, 186 { "uid", &set_inode.i_uid, &set_inode.osd2.linux2.l_i_uid_high, 187 2, parse_uint }, 188 { "size", &set_inode.i_size, &set_inode.i_size_high, 4, parse_uint }, 189 { "atime", &set_inode.i_atime, &set_inode.i_atime_extra, 190 4, parse_time }, 191 { "ctime", &set_inode.i_ctime, &set_inode.i_ctime_extra, 192 4, parse_time }, 193 { "mtime", &set_inode.i_mtime, &set_inode.i_mtime_extra, 194 4, parse_time }, 195 { "dtime", &set_inode.i_dtime, NULL, 196 4, parse_time }, 197 { "gid", &set_inode.i_gid, &set_inode.osd2.linux2.l_i_gid_high, 198 2, parse_uint }, 199 { "links_count", &set_inode.i_links_count, NULL, 2, parse_uint }, 200 /* Special case: i_blocks is 4 bytes, i_blocks_high is 2 bytes */ 201 { "blocks", &set_inode.i_blocks, &set_inode.osd2.linux2.l_i_blocks_hi, 202 6, parse_uint }, 203 { "flags", &set_inode.i_flags, NULL, 4, parse_uint }, 204 { "version", &set_inode.osd1.linux1.l_i_version, 205 &set_inode.i_version_hi, 4, parse_uint }, 206 { "translator", &set_inode.osd1.hurd1.h_i_translator, NULL, 207 4, parse_uint, FLAG_ALIAS }, 208 { "block", &set_inode.i_block[0], NULL, 4, parse_uint, FLAG_ARRAY, 209 EXT2_NDIR_BLOCKS }, 210 { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], NULL, 4, parse_uint }, 211 { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], NULL, 4, parse_uint }, 212 { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], NULL, 4, parse_uint }, 213 { "generation", &set_inode.i_generation, NULL, 4, parse_uint }, 214 /* Special case: i_file_acl_high is 2 bytes */ 215 { "file_acl", &set_inode.i_file_acl, 216 &set_inode.osd2.linux2.l_i_file_acl_high, 6, parse_uint }, 217 { "faddr", &set_inode.i_faddr, NULL, 4, parse_uint }, 218 { "frag", &set_inode.osd2.hurd2.h_i_frag, NULL, 1, parse_uint, FLAG_ALIAS }, 219 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, NULL, 1, parse_uint }, 220 { "checksum", &set_inode.osd2.linux2.l_i_checksum_lo, 221 &set_inode.i_checksum_hi, 2, parse_uint }, 222 { "author", &set_inode.osd2.hurd2.h_i_author, NULL, 223 4, parse_uint, FLAG_ALIAS }, 224 { "extra_isize", &set_inode.i_extra_isize, NULL, 225 2, parse_uint }, 226 { "ctime_extra", &set_inode.i_ctime_extra, NULL, 227 4, parse_uint, FLAG_ALIAS }, 228 { "mtime_extra", &set_inode.i_mtime_extra, NULL, 229 4, parse_uint, FLAG_ALIAS }, 230 { "atime_extra", &set_inode.i_atime_extra, NULL, 231 4, parse_uint, FLAG_ALIAS }, 232 { "crtime", &set_inode.i_crtime, &set_inode.i_crtime_extra, 233 4, parse_time }, 234 { "crtime_extra", &set_inode.i_crtime_extra, NULL, 235 4, parse_uint, FLAG_ALIAS }, 236 { "projid", &set_inode.i_projid, NULL, 4, parse_uint }, 237 { "bmap", NULL, NULL, 4, parse_bmap, FLAG_ARRAY }, 238 { 0, 0, 0, 0 } 239 }; 240 241 static struct field_set_info ext2_bg_fields[] = { 242 { "block_bitmap", &set_gd.bg_block_bitmap, NULL, 4, parse_uint }, 243 { "inode_bitmap", &set_gd.bg_inode_bitmap, NULL, 4, parse_uint }, 244 { "inode_table", &set_gd.bg_inode_table, NULL, 4, parse_uint }, 245 { "free_blocks_count", &set_gd.bg_free_blocks_count, NULL, 2, parse_uint }, 246 { "free_inodes_count", &set_gd.bg_free_inodes_count, NULL, 2, parse_uint }, 247 { "used_dirs_count", &set_gd.bg_used_dirs_count, NULL, 2, parse_uint }, 248 { "flags", &set_gd.bg_flags, NULL, 2, parse_uint }, 249 { "itable_unused", &set_gd.bg_itable_unused, NULL, 2, parse_uint }, 250 { "checksum", &set_gd.bg_checksum, NULL, 2, parse_gd_csum }, 251 { 0, 0, 0, 0 } 252 }; 253 254 static struct field_set_info ext4_bg_fields[] = { 255 { "block_bitmap", &set_gd4.bg_block_bitmap, 256 &set_gd4.bg_block_bitmap_hi, 4, parse_uint }, 257 { "inode_bitmap", &set_gd4.bg_inode_bitmap, 258 &set_gd4.bg_inode_bitmap_hi, 4, parse_uint }, 259 { "inode_table", &set_gd4.bg_inode_table, 260 &set_gd4.bg_inode_table_hi, 4, parse_uint }, 261 { "free_blocks_count", &set_gd4.bg_free_blocks_count, 262 &set_gd4.bg_free_blocks_count_hi, 2, parse_uint }, 263 { "free_inodes_count", &set_gd4.bg_free_inodes_count, 264 &set_gd4.bg_free_inodes_count_hi, 2, parse_uint }, 265 { "used_dirs_count", &set_gd4.bg_used_dirs_count, 266 &set_gd4.bg_used_dirs_count_hi, 2, parse_uint }, 267 { "flags", &set_gd4.bg_flags, NULL, 2, parse_uint }, 268 { "exclude_bitmap", &set_gd4.bg_exclude_bitmap_lo, 269 &set_gd4.bg_exclude_bitmap_hi, 4, parse_uint }, 270 { "block_bitmap_csum", &set_gd4.bg_block_bitmap_csum_lo, 271 &set_gd4.bg_block_bitmap_csum_hi, 2, parse_uint }, 272 { "inode_bitmap_csum", &set_gd4.bg_inode_bitmap_csum_lo, 273 &set_gd4.bg_inode_bitmap_csum_hi, 2, parse_uint }, 274 { "itable_unused", &set_gd4.bg_itable_unused, 275 &set_gd4.bg_itable_unused_hi, 2, parse_uint }, 276 { "checksum", &set_gd4.bg_checksum, NULL, 2, parse_gd_csum }, 277 { 0, 0, 0, 0 } 278 }; 279 280 static struct field_set_info mmp_fields[] = { 281 { "clear", &set_mmp.mmp_magic, NULL, sizeof(set_mmp), 282 parse_mmp_clear, FLAG_ALIAS }, 283 { "magic", &set_mmp.mmp_magic, NULL, 4, parse_uint }, 284 { "seq", &set_mmp.mmp_seq, NULL, 4, parse_uint }, 285 { "time", &set_mmp.mmp_time, NULL, 8, parse_uint }, 286 { "nodename", &set_mmp.mmp_nodename, NULL, sizeof(set_mmp.mmp_nodename), 287 parse_string }, 288 { "bdevname", &set_mmp.mmp_bdevname, NULL, sizeof(set_mmp.mmp_bdevname), 289 parse_string }, 290 { "check_interval", &set_mmp.mmp_check_interval, NULL, 2, parse_uint }, 291 { "checksum", &set_mmp.mmp_checksum, NULL, 4, parse_uint }, 292 { 0, 0, 0, 0 } 293 }; 294 #if __GNUC_PREREQ (4, 6) 295 #pragma GCC diagnostic pop 296 #endif 297 298 #ifdef UNITTEST 299 300 301 static void do_verify_field_set_info(struct field_set_info *fields, 302 const void *data, size_t size) 303 { 304 struct field_set_info *ss, *ss2; 305 const char *begin = (char *)data; 306 const char *end = begin + size; 307 308 for (ss = fields ; ss->name ; ss++) { 309 const char *ptr; 310 311 /* Check pointers */ 312 ptr = ss->ptr; 313 assert(!ptr || (ptr >= begin && ptr < end)); 314 ptr = ss->ptr2; 315 assert(!ptr || (ptr >= begin && ptr < end)); 316 317 /* Check function */ 318 assert(ss->func); 319 320 for (ss2 = fields ; ss2 != ss ; ss2++) { 321 /* Check duplicate names */ 322 assert(strcmp(ss->name, ss2->name)); 323 324 if (ss->flags & FLAG_ALIAS || ss2->flags & FLAG_ALIAS) 325 continue; 326 /* Check false aliases, might be copy-n-paste error */ 327 assert(!ss->ptr || (ss->ptr != ss2->ptr && 328 ss->ptr != ss2->ptr2)); 329 assert(!ss->ptr2 || (ss->ptr2 != ss2->ptr && 330 ss->ptr2 != ss2->ptr2)); 331 } 332 } 333 } 334 335 int main(int argc, char **argv) 336 { 337 do_verify_field_set_info(super_fields, &set_sb, sizeof(set_sb)); 338 do_verify_field_set_info(inode_fields, &set_inode, sizeof(set_inode)); 339 do_verify_field_set_info(ext2_bg_fields, &set_gd, sizeof(set_gd)); 340 do_verify_field_set_info(ext4_bg_fields, &set_gd4, sizeof(set_gd4)); 341 do_verify_field_set_info(mmp_fields, &set_mmp, sizeof(set_mmp)); 342 return 0; 343 } 344 345 ext2_filsys current_fs; 346 ext2_ino_t root, cwd; 347 348 #endif /* UNITTEST */ 349 350 static int check_suffix(const char *field) 351 { 352 int len = strlen(field); 353 354 if (len <= 3) 355 return 0; 356 field += len-3; 357 if (!strcmp(field, "_lo")) 358 return 1; 359 if (!strcmp(field, "_hi")) 360 return 2; 361 return 0; 362 } 363 364 static struct field_set_info *find_field(struct field_set_info *fields, 365 char *field) 366 { 367 struct field_set_info *ss; 368 const char *prefix; 369 char *arg, *delim, *idx, *tmp; 370 int suffix, prefix_len; 371 372 if (fields == super_fields) 373 prefix = "s_"; 374 else if (fields == inode_fields) 375 prefix = "i_"; 376 else 377 prefix = "bg_"; 378 prefix_len = strlen(prefix); 379 if (strncmp(field, prefix, prefix_len) == 0) 380 field += prefix_len; 381 382 arg = malloc(strlen(field)+1); 383 if (!arg) 384 return NULL; 385 strcpy(arg, field); 386 387 idx = strchr(arg, '['); 388 if (idx) { 389 *idx++ = 0; 390 delim = idx + strlen(idx) - 1; 391 if (!*idx || *delim != ']') 392 idx = 0; 393 else 394 *delim = 0; 395 } 396 /* 397 * Can we parse the number? 398 */ 399 if (idx) { 400 array_idx = strtol(idx, &tmp, 0); 401 if (*tmp) { 402 *(--idx) = '['; 403 *delim = ']'; 404 idx = 0; 405 } 406 } 407 408 /* 409 * If there is a valid _hi or a _lo suffix, strip it off 410 */ 411 suffix = check_suffix(arg); 412 if (suffix > 0) 413 arg[strlen(arg)-3] = 0; 414 415 for (ss = fields ; ss->name ; ss++) { 416 if (suffix && ss->ptr2 == 0) 417 continue; 418 if (ss->flags & FLAG_ARRAY) { 419 if (!idx || (strcmp(ss->name, arg) != 0)) 420 continue; 421 if (ss->max_idx > 0 && array_idx >= ss->max_idx) 422 continue; 423 } else { 424 if (strcmp(ss->name, arg) != 0) 425 continue; 426 } 427 free(arg); 428 return ss; 429 } 430 free(arg); 431 return NULL; 432 } 433 434 /* 435 * Note: info->size == 6 is special; this means a base size 4 bytes, 436 * and secondary (high) size of 2 bytes. This is needed for the 437 * special case of i_blocks_high and i_file_acl_high. 438 */ 439 static errcode_t parse_uint(struct field_set_info *info, char *field, 440 char *arg) 441 { 442 unsigned long long n, num, mask, limit; 443 int suffix = check_suffix(field); 444 char *tmp; 445 void *field1 = info->ptr, *field2 = info->ptr2; 446 int size = (info->size == 6) ? 4 : info->size; 447 union { 448 __u64 *ptr64; 449 __u32 *ptr32; 450 __u16 *ptr16; 451 __u8 *ptr8; 452 } u; 453 454 if (suffix == 1) 455 field2 = 0; 456 if (suffix == 2) { 457 field1 = field2; 458 field2 = 0; 459 } 460 461 u.ptr8 = (__u8 *) field1; 462 if (info->flags & FLAG_ARRAY) 463 u.ptr8 += array_idx * info->size; 464 465 errno = 0; 466 num = STRTOULL(arg, &tmp, 0); 467 if (*tmp || errno) { 468 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 469 arg, info->name); 470 return EINVAL; 471 } 472 mask = ~0ULL >> ((8 - size) * 8); 473 limit = ~0ULL >> ((8 - info->size) * 8); 474 if (field2 && info->size != 6) 475 limit = ~0ULL >> ((8 - info->size*2) * 8); 476 477 if (num > limit) { 478 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n", 479 arg, info->name, limit); 480 return EINVAL; 481 } 482 n = num & mask; 483 switch (size) { 484 case 8: 485 /* Should never get here */ 486 fprintf(stderr, "64-bit field %s has a second 64-bit field\n" 487 "defined; BUG?!?\n", info->name); 488 *u.ptr64 = 0; 489 break; 490 case 4: 491 *u.ptr32 = n; 492 break; 493 case 2: 494 *u.ptr16 = n; 495 break; 496 case 1: 497 *u.ptr8 = n; 498 break; 499 } 500 if (!field2) 501 return 0; 502 n = (size == 8) ? 0 : (num >> (size*8)); 503 u.ptr8 = (__u8 *) field2; 504 if (info->size == 6) 505 size = 2; 506 switch (size) { 507 case 8: 508 *u.ptr64 = n; 509 break; 510 case 4: 511 *u.ptr32 = n; 512 break; 513 case 2: 514 *u.ptr16 = n; 515 break; 516 case 1: 517 *u.ptr8 = n; 518 break; 519 } 520 return 0; 521 } 522 523 static errcode_t parse_int(struct field_set_info *info, 524 char *field EXT2FS_ATTR((unused)), char *arg) 525 { 526 long num; 527 char *tmp; 528 __s32 *ptr32; 529 __s16 *ptr16; 530 __s8 *ptr8; 531 532 num = strtol(arg, &tmp, 0); 533 if (*tmp) { 534 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 535 arg, info->name); 536 return EINVAL; 537 } 538 switch (info->size) { 539 case 4: 540 ptr32 = (__s32 *) info->ptr; 541 *ptr32 = num; 542 break; 543 case 2: 544 ptr16 = (__s16 *) info->ptr; 545 *ptr16 = num; 546 break; 547 case 1: 548 ptr8 = (__s8 *) info->ptr; 549 *ptr8 = num; 550 break; 551 } 552 return 0; 553 } 554 555 static errcode_t parse_string(struct field_set_info *info, 556 char *field EXT2FS_ATTR((unused)), char *arg) 557 { 558 char *cp = (char *) info->ptr; 559 560 if (strlen(arg) >= info->size) { 561 fprintf(stderr, "Error maximum size for %s is %d.\n", 562 info->name, info->size); 563 return EINVAL; 564 } 565 strcpy(cp, arg); 566 return 0; 567 } 568 569 static errcode_t parse_time(struct field_set_info *info, 570 char *field, char *arg) 571 { 572 __s64 t; 573 __u32 t_low, t_high; 574 __u32 *ptr_low, *ptr_high; 575 576 if (check_suffix(field)) 577 return parse_uint(info, field, arg); 578 579 ptr_low = (__u32 *) info->ptr; 580 ptr_high = (__u32 *) info->ptr2; 581 582 t = string_to_time(arg); 583 584 if (t == -1) { 585 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 586 arg, info->name); 587 return EINVAL; 588 } 589 t_low = (__u32) t; 590 t_high = ((t - (__s32)t) >> 32) & EXT4_EPOCH_MASK; 591 *ptr_low = t_low; 592 if (ptr_high) 593 *ptr_high = (*ptr_high & ~EXT4_EPOCH_MASK) | t_high; 594 return 0; 595 } 596 597 static errcode_t parse_uuid(struct field_set_info *info, 598 char *field EXT2FS_ATTR((unused)), char *arg) 599 { 600 unsigned char * p = (unsigned char *) info->ptr; 601 602 if ((strcasecmp(arg, "null") == 0) || 603 (strcasecmp(arg, "clear") == 0)) { 604 uuid_clear(p); 605 } else if (strcasecmp(arg, "time") == 0) { 606 uuid_generate_time(p); 607 } else if (strcasecmp(arg, "random") == 0) { 608 uuid_generate(p); 609 } else if (uuid_parse(arg, p)) { 610 fprintf(stderr, "Invalid UUID format: %s\n", arg); 611 return EINVAL; 612 } 613 return 0; 614 } 615 616 static errcode_t parse_hashalg(struct field_set_info *info, 617 char *field EXT2FS_ATTR((unused)), char *arg) 618 { 619 int hashv; 620 unsigned char *p = (unsigned char *) info->ptr; 621 622 hashv = e2p_string2hash(arg); 623 if (hashv < 0) { 624 fprintf(stderr, "Invalid hash algorithm: %s\n", arg); 625 return EINVAL; 626 } 627 *p = hashv; 628 return 0; 629 } 630 631 static errcode_t parse_bmap(struct field_set_info *info, 632 char *field EXT2FS_ATTR((unused)), char *arg) 633 { 634 blk64_t blk; 635 errcode_t retval; 636 char *tmp; 637 638 blk = strtoull(arg, &tmp, 0); 639 if (*tmp) { 640 fprintf(stderr, "Couldn't parse '%s' for field %s.\n", 641 arg, info->name); 642 return EINVAL; 643 } 644 645 retval = ext2fs_bmap2(current_fs, set_ino, 646 (struct ext2_inode *) &set_inode, 647 NULL, BMAP_ALLOC | BMAP_SET, array_idx, NULL, 648 &blk); 649 if (retval) { 650 com_err("set_inode", retval, "while setting block map"); 651 } 652 return retval; 653 } 654 655 static errcode_t parse_gd_csum(struct field_set_info *info, char *field, 656 char *arg) 657 { 658 __u16 *checksum = info->ptr; 659 660 if (strcmp(arg, "calc") == 0) { 661 *checksum = ext2fs_group_desc_csum(current_fs, set_bg); 662 printf("Checksum set to 0x%04x\n", *checksum); 663 return 0; 664 } 665 return parse_uint(info, field, arg); 666 } 667 668 static void print_possible_fields(struct field_set_info *fields) 669 { 670 struct field_set_info *ss; 671 const char *type, *cmd; 672 FILE *f; 673 char name[40], idx[40]; 674 675 if (fields == super_fields) { 676 type = "Superblock"; 677 cmd = "set_super_value"; 678 } else if (fields == inode_fields) { 679 type = "Inode"; 680 cmd = "set_inode"; 681 } else if (fields == mmp_fields) { 682 type = "MMP"; 683 cmd = "set_mmp_value"; 684 } else { 685 type = "Block group descriptor"; 686 cmd = "set_block_group"; 687 } 688 f = open_pager(); 689 690 fprintf(f, "%s fields supported by the %s command:\n", type, cmd); 691 692 for (ss = fields ; ss->name ; ss++) { 693 type = "unknown"; 694 if (ss->func == parse_string) 695 type = "string"; 696 else if (ss->func == parse_int) 697 type = "integer"; 698 else if (ss->func == parse_uint) 699 type = "unsigned integer"; 700 else if (ss->func == parse_uuid) 701 type = "UUID"; 702 else if (ss->func == parse_hashalg) 703 type = "hash algorithm"; 704 else if (ss->func == parse_time) 705 type = "date/time"; 706 else if (ss->func == parse_bmap) 707 type = "set physical->logical block map"; 708 else if (ss->func == parse_gd_csum) 709 type = "unsigned integer OR \"calc\""; 710 strcpy(name, ss->name); 711 if (ss->flags & FLAG_ARRAY) { 712 if (ss->max_idx > 0) 713 sprintf(idx, "[%d]", ss->max_idx); 714 else 715 strcpy(idx, "[]"); 716 strcat(name, idx); 717 } 718 if (ss->ptr2) 719 strcat(name, "[_hi|_lo]"); 720 fprintf(f, "\t%-25s\t%s\n", name, type); 721 } 722 close_pager(f); 723 } 724 725 726 void do_set_super(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)), 727 void *infop EXT2FS_ATTR((unused))) 728 { 729 const char *usage = "<field> <value>\n" 730 "\t\"set_super_value -l\" will list the names of " 731 "superblock fields\n\twhich can be set."; 732 static struct field_set_info *ss; 733 734 if ((argc == 2) && !strcmp(argv[1], "-l")) { 735 print_possible_fields(super_fields); 736 return; 737 } 738 739 if (common_args_process(argc, argv, 3, 3, "set_super_value", 740 usage, CHECK_FS_RW)) 741 return; 742 743 if ((ss = find_field(super_fields, argv[1])) == 0) { 744 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); 745 return; 746 } 747 set_sb = *current_fs->super; 748 if (ss->func(ss, argv[1], argv[2]) == 0) { 749 *current_fs->super = set_sb; 750 ext2fs_mark_super_dirty(current_fs); 751 } 752 } 753 754 void do_set_inode(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)), 755 void *infop EXT2FS_ATTR((unused))) 756 { 757 const char *usage = "<inode> <field> <value>\n" 758 "\t\"set_inode_field -l\" will list the names of " 759 "the fields in an ext2 inode\n\twhich can be set."; 760 static struct field_set_info *ss; 761 762 if ((argc == 2) && !strcmp(argv[1], "-l")) { 763 print_possible_fields(inode_fields); 764 return; 765 } 766 767 if (common_args_process(argc, argv, 4, 4, "set_inode", 768 usage, CHECK_FS_RW)) 769 return; 770 771 if ((ss = find_field(inode_fields, argv[2])) == 0) { 772 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 773 return; 774 } 775 776 set_ino = string_to_inode(argv[1]); 777 if (!set_ino) 778 return; 779 780 if (debugfs_read_inode_full(set_ino, 781 (struct ext2_inode *) &set_inode, argv[1], 782 sizeof(set_inode))) 783 return; 784 785 if (ss->func(ss, argv[2], argv[3]) == 0) { 786 if (debugfs_write_inode_full(set_ino, 787 (struct ext2_inode *) &set_inode, 788 argv[1], sizeof(set_inode))) 789 return; 790 } 791 } 792 793 void do_set_block_group_descriptor(int argc, char *argv[], 794 int sci_idx EXT2FS_ATTR((unused)), 795 void *infop EXT2FS_ATTR((unused))) 796 { 797 const char *usage = "<bg number> <field> <value>\n" 798 "\t\"set_block_group -l\" will list the names of " 799 "the fields in a block group descriptor\n\twhich can be set."; 800 struct field_set_info *table; 801 struct field_set_info *ss; 802 char *end; 803 void *edit, *target; 804 int size; 805 806 /* 807 * Determine whether we are editing an ext2 or ext4 block group 808 * descriptor. Descriptors larger than ext4_group_desc cannot 809 * have their fields edited yet, because they do not have any 810 * names assigned. When that happens, this function needs to 811 * be updated for the new descriptor struct and fields. 812 */ 813 if (current_fs && 814 EXT2_DESC_SIZE(current_fs->super) >= EXT2_MIN_DESC_SIZE_64BIT) { 815 table = ext4_bg_fields; 816 edit = &set_gd4; 817 size = sizeof(set_gd4); 818 } else { 819 table = ext2_bg_fields; 820 edit = &set_gd; 821 size = sizeof(set_gd); 822 } 823 824 if ((argc == 2) && !strcmp(argv[1], "-l")) { 825 print_possible_fields(table); 826 return; 827 } 828 829 if (common_args_process(argc, argv, 4, 4, "set_block_group", 830 usage, CHECK_FS_RW)) 831 return; 832 833 set_bg = strtoul(argv[1], &end, 0); 834 if (*end) { 835 com_err(argv[0], 0, "invalid block group number: %s", argv[1]); 836 return; 837 } 838 839 if (set_bg >= current_fs->group_desc_count) { 840 com_err(argv[0], 0, "block group number too big: %d", set_bg); 841 return; 842 } 843 844 if ((ss = find_field(table, argv[2])) == 0) { 845 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); 846 return; 847 } 848 849 target = ext2fs_group_desc(current_fs, current_fs->group_desc, set_bg); 850 memcpy(edit, target, size); 851 if (ss->func(ss, argv[2], argv[3]) == 0) { 852 memcpy(target, edit, size); 853 ext2fs_mark_super_dirty(current_fs); 854 } 855 } 856 857 static errcode_t parse_mmp_clear(struct field_set_info *info, 858 char *field EXT2FS_ATTR((unused)), 859 char *arg EXT2FS_ATTR((unused))) 860 { 861 errcode_t retval; 862 863 retval = ext2fs_mmp_clear(current_fs); 864 if (retval != 0) 865 com_err("set_mmp_value", retval, "while clearing MMP block\n"); 866 else 867 memcpy(info->ptr, current_fs->mmp_buf, info->size); 868 869 return 1; /* we don't need the MMP block written again */ 870 } 871 872 #ifdef CONFIG_MMP 873 void do_set_mmp_value(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)), 874 void *infop EXT2FS_ATTR((unused))) 875 { 876 const char *usage = "<field> <value>\n" 877 "\t\"set_mmp_value -l\" will list the names of " 878 "MMP fields\n\twhich can be set."; 879 static struct field_set_info *smmp; 880 struct mmp_struct *mmp_s; 881 errcode_t retval; 882 883 if (argc == 2 && strcmp(argv[1], "-l") == 0) { 884 print_possible_fields(mmp_fields); 885 return; 886 } 887 888 if (check_fs_open(argv[0])) 889 return; 890 891 if (current_fs->super->s_mmp_block == 0) { 892 com_err(argv[0], 0, "no MMP block allocated\n"); 893 return; 894 } 895 896 if (common_args_process(argc, argv, 2, 3, "set_mmp_value", 897 usage, CHECK_FS_RW)) 898 return; 899 900 mmp_s = current_fs->mmp_buf; 901 if (mmp_s == NULL) { 902 retval = ext2fs_get_mem(current_fs->blocksize, &mmp_s); 903 if (retval) { 904 com_err(argv[0], retval, "allocating MMP buffer\n"); 905 return; 906 } 907 retval = ext2fs_mmp_read(current_fs, 908 current_fs->super->s_mmp_block, mmp_s); 909 if (retval) { 910 com_err(argv[0], retval, "reading MMP block %llu.\n", 911 (long long)current_fs->super->s_mmp_block); 912 ext2fs_free_mem(&mmp_s); 913 return; 914 } 915 current_fs->mmp_buf = mmp_s; 916 } 917 918 smmp = find_field(mmp_fields, argv[1]); 919 if (smmp == 0) { 920 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); 921 return; 922 } 923 924 set_mmp = *mmp_s; 925 if (smmp->func(smmp, argv[1], argv[2]) == 0) { 926 ext2fs_mmp_write(current_fs, current_fs->super->s_mmp_block, 927 &set_mmp); 928 *mmp_s = set_mmp; 929 } 930 } 931 #else 932 void do_set_mmp_value(int argc EXT2FS_ATTR((unused)), 933 char *argv[] EXT2FS_ATTR((unused)), 934 int sci_idx EXT2FS_ATTR((unused)), 935 void *infop EXT2FS_ATTR((unused))) 936 { 937 fprintf(stdout, "MMP is unsupported, please recompile with " 938 "--enable-mmp\n"); 939 } 940 #endif 941 942
