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