debugfs/set_fields.c

   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 500 /* for inclusion of strptime() */
  13
  14 #include <stdio.h>
  15 #include <unistd.h>
  16 #include <stdlib.h>
  17 #include <ctype.h>
  18 #include <string.h>
  19 #include <strings.h>
  20 #include <time.h>
  21 #include <sys/types.h>
  22 #include <sys/stat.h>
  23 #ifdef HAVE_ERRNO_H
  24 #include <errno.h>
  25 #endif
  26 #include <fcntl.h>
  27 #include <utime.h>
  28
  29 #include "debugfs.h"
  30 #include "uuid/uuid.h"
  31 #include "e2p/e2p.h"
  32
  33 static struct ext2_super_block set_sb;
  34 static struct ext2_inode set_inode;
  35 static struct ext2_group_desc set_gd;
  36 static ext2_ino_t set_ino;
  37 static int array_idx;
  38
  39 #define FLAG_ARRAY      0x0001
  40
  41 struct field_set_info {
  42         const char      *name;
  43         void    *ptr;
  44         unsigned int    size;
  45         errcode_t (*func)(struct field_set_info *info, char *arg);
  46         int flags;
  47         int max_idx;
  48 };
  49
  50 static errcode_t parse_uint(struct field_set_info *info, char *arg);
  51 static errcode_t parse_int(struct field_set_info *info, char *arg);
  52 static errcode_t parse_string(struct field_set_info *info, char *arg);
  53 static errcode_t parse_uuid(struct field_set_info *info, char *arg);
  54 static errcode_t parse_hashalg(struct field_set_info *info, char *arg);
  55 static errcode_t parse_time(struct field_set_info *info, char *arg);
  56 static errcode_t parse_bmap(struct field_set_info *info, char *arg);
  57
  58 static struct field_set_info super_fields[] = {
  59         { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint },
  60         { "blocks_count", &set_sb.s_blocks_count, 4, parse_uint },
  61         { "r_blocks_count", &set_sb.s_r_blocks_count, 4, parse_uint },
  62         { "free_blocks_count", &set_sb.s_free_blocks_count, 4, parse_uint },
  63         { "free_inodes_count", &set_sb.s_free_inodes_count, 4, parse_uint },
  64         { "first_data_block", &set_sb.s_first_data_block, 4, parse_uint },
  65         { "log_block_size", &set_sb.s_log_block_size, 4, parse_uint },
  66         { "log_frag_size", &set_sb.s_log_frag_size, 4, parse_int },
  67         { "blocks_per_group", &set_sb.s_blocks_per_group, 4, parse_uint },
  68         { "frags_per_group", &set_sb.s_frags_per_group, 4, parse_uint },
  69         { "inodes_per_group", &set_sb.s_inodes_per_group, 4, parse_uint },
  70         { "mtime", &set_sb.s_mtime, 4, parse_time },
  71         { "wtime", &set_sb.s_wtime, 4, parse_time },
  72         { "mnt_count", &set_sb.s_mnt_count, 2, parse_uint },
  73         { "max_mnt_count", &set_sb.s_max_mnt_count, 2, parse_int },
  74         /* s_magic */
  75         { "state", &set_sb.s_state, 2, parse_uint },
  76         { "errors", &set_sb.s_errors, 2, parse_uint },
  77         { "minor_rev_level", &set_sb.s_minor_rev_level, 2, parse_uint },
  78         { "lastcheck", &set_sb.s_lastcheck, 4, parse_time },
  79         { "checkinterval", &set_sb.s_checkinterval, 4, parse_uint },
  80         { "creator_os", &set_sb.s_creator_os, 4, parse_uint },
  81         { "rev_level", &set_sb.s_rev_level, 4, parse_uint },
  82         { "def_resuid", &set_sb.s_def_resuid, 2, parse_uint },
  83         { "def_resgid", &set_sb.s_def_resgid, 2, parse_uint },
  84         { "first_ino", &set_sb.s_first_ino, 4, parse_uint },
  85         { "inode_size", &set_sb.s_inode_size, 2, parse_uint },
  86         { "block_group_nr", &set_sb.s_block_group_nr, 2, parse_uint },
  87         { "feature_compat", &set_sb.s_feature_compat, 4, parse_uint },
  88         { "feature_incompat", &set_sb.s_feature_incompat, 4, parse_uint },
  89         { "feature_ro_compat", &set_sb.s_feature_ro_compat, 4, parse_uint },
  90         { "uuid", &set_sb.s_uuid, 16, parse_uuid },
  91         { "volume_name",  &set_sb.s_volume_name, 16, parse_string },
  92         { "last_mounted",  &set_sb.s_last_mounted, 64, parse_string },
  93         { "lastcheck",  &set_sb.s_lastcheck, 4, parse_uint },
  94         { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap,
  95                   4, parse_uint },
  96         { "prealloc_blocks", &set_sb.s_prealloc_blocks, 1, parse_uint },
  97         { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, 1,
  98                   parse_uint },
  99         { "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, 2,
 100                   parse_uint },
 101         /* s_padding1 */
 102         { "journal_uuid", &set_sb.s_journal_uuid, 16, parse_uuid },
 103         { "journal_inum", &set_sb.s_journal_inum, 4, parse_uint },
 104         { "journal_dev", &set_sb.s_journal_dev, 4, parse_uint },
 105         { "last_orphan", &set_sb.s_last_orphan, 4, parse_uint },
 106         { "hash_seed", &set_sb.s_hash_seed, 16, parse_uuid },
 107         { "def_hash_version", &set_sb.s_def_hash_version, 1, parse_hashalg },
 108         { "jnl_backup_type", &set_sb.s_jnl_backup_type, 1, parse_uint },
 109         /* s_reserved_word_pad */
 110         { "default_mount_opts", &set_sb.s_default_mount_opts, 4, parse_uint },
 111         { "first_meta_bg", &set_sb.s_first_meta_bg, 4, parse_uint },
 112         { "mkfs_time", &set_sb.s_mkfs_time, 4, parse_time },
 113         { "jnl_blocks", &set_sb.s_jnl_blocks[0], 4, parse_uint, FLAG_ARRAY,
 114           17 },
 115         { "flags", &set_sb.s_flags, 4, parse_uint },
 116         { 0, 0, 0, 0 }
 117 };
 118
 119 static struct field_set_info inode_fields[] = {
 120         { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint },
 121         { "mode", &set_inode.i_mode, 2, parse_uint },
 122         { "uid", &set_inode.i_uid, 2, parse_uint },
 123         { "size", &set_inode.i_size, 4, parse_uint },
 124         { "atime", &set_inode.i_atime, 4, parse_time },
 125         { "ctime", &set_inode.i_ctime, 4, parse_time },
 126         { "mtime", &set_inode.i_mtime, 4, parse_time },
 127         { "dtime", &set_inode.i_dtime, 4, parse_time },
 128         { "gid", &set_inode.i_gid, 2, parse_uint },
 129         { "links_count", &set_inode.i_links_count, 2, parse_uint },
 130         { "blocks", &set_inode.i_blocks, 4, parse_uint },
 131         { "flags", &set_inode.i_flags, 4, parse_uint },
 132         { "version", &set_inode.osd1.linux1.l_i_version, 4, parse_uint },
 133         { "translator", &set_inode.osd1.hurd1.h_i_translator, 4, parse_uint },
 134         { "block", &set_inode.i_block[0], 4, parse_uint, FLAG_ARRAY,
 135           EXT2_NDIR_BLOCKS },
 136         { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], 4, parse_uint },
 137         { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], 4, parse_uint },
 138         { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], 4, parse_uint },
 139         { "generation", &set_inode.i_generation, 4, parse_uint },
 140         { "file_acl", &set_inode.i_file_acl, 4, parse_uint },
 141         { "dir_acl", &set_inode.i_dir_acl, 4, parse_uint },
 142         { "faddr", &set_inode.i_faddr, 4, parse_uint },
 143         { "blocks_hi", &set_inode.osd2.linux2.l_i_blocks_hi, 2, parse_uint },
 144         { "frag", &set_inode.osd2.hurd2.h_i_frag, 1, parse_uint },
 145         { "fsize", &set_inode.osd2.hurd2.h_i_fsize, 1, parse_uint },
 146         { "uid_high", &set_inode.osd2.linux2.l_i_uid_high, 2, parse_uint },
 147         { "gid_high", &set_inode.osd2.linux2.l_i_gid_high, 2, parse_uint },
 148         { "author", &set_inode.osd2.hurd2.h_i_author, 4, parse_uint },
 149         { "bmap", NULL, 4, parse_bmap, FLAG_ARRAY },
 150         { 0, 0, 0, 0 }
 151 };
 152
 153 static struct field_set_info ext2_bg_fields[] = {
 154         { "block_bitmap", &set_gd.bg_block_bitmap, 4, parse_uint },
 155         { "inode_bitmap", &set_gd.bg_inode_bitmap, 4, parse_uint },
 156         { "inode_table", &set_gd.bg_inode_table, 4, parse_uint },
 157         { "free_blocks_count", &set_gd.bg_free_blocks_count, 2, parse_uint },
 158         { "free_inodes_count", &set_gd.bg_free_inodes_count, 2, parse_uint },
 159         { "used_dirs_count", &set_gd.bg_used_dirs_count, 2, parse_uint },
 160         { "flags", &set_gd.bg_flags, 2, parse_uint },
 161         { "reserved", &set_gd.bg_reserved, 2, parse_uint, FLAG_ARRAY, 2 },
 162         { "itable_unused", &set_gd.bg_itable_unused, 2, parse_uint },
 163         { "checksum", &set_gd.bg_checksum, 2, parse_uint },
 164         { 0, 0, 0, 0 }
 165 };
 166
 167
 168 static struct field_set_info *find_field(struct field_set_info *fields,
 169                                          char *field)
 170 {
 171         struct field_set_info *ss;
 172         const char      *prefix;
 173         char            *arg, *delim, *idx, *tmp;
 174         int             prefix_len;
 175
 176         if (fields == super_fields)
 177                 prefix = "s_";
 178         else if (fields == inode_fields)
 179                 prefix = "i_";
 180         else
 181                 prefix = "bg_";
 182         prefix_len = strlen(prefix);
 183         if (strncmp(field, prefix, prefix_len) == 0)
 184                 field += prefix_len;
 185
 186         arg = malloc(strlen(field)+1);
 187         if (!arg)
 188                 return NULL;
 189         strcpy(arg, field);
 190
 191         idx = strchr(arg, '[');
 192         if (idx) {
 193                 *idx++ = 0;
 194                 delim = idx + strlen(idx) - 1;
 195                 if (!*idx || *delim != ']')
 196                         idx = 0;
 197                 else
 198                         *delim = 0;
 199         }
 200         /*
 201          * Can we parse the number?
 202          */
 203         if (idx) {
 204                 array_idx = strtol(idx, &tmp, 0);
 205                 if (*tmp)
 206                         idx = 0;
 207         }
 208
 209         for (ss = fields ; ss->name ; ss++) {
 210                 if (ss->flags & FLAG_ARRAY) {
 211                         if (!idx || (strcmp(ss->name, arg) != 0))
 212                                 continue;
 213                         if (ss->max_idx > 0 && array_idx >= ss->max_idx)
 214                                 continue;
 215                 } else {
 216                         if (strcmp(ss->name, field) != 0)
 217                                 continue;
 218                 }
 219                 return ss;
 220         }
 221
 222         return NULL;
 223 }
 224
 225 static errcode_t parse_uint(struct field_set_info *info, char *arg)
 226 {
 227         unsigned long   num;
 228         char *tmp;
 229         union {
 230                 __u32   *ptr32;
 231                 __u16   *ptr16;
 232                 __u8    *ptr8;
 233         } u;
 234
 235         u.ptr8 = (__u8 *) info->ptr;
 236         if (info->flags & FLAG_ARRAY)
 237                 u.ptr8 += array_idx * info->size;
 238
 239         num = strtoul(arg, &tmp, 0);
 240         if (*tmp) {
 241                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 242                         arg, info->name);
 243                 return EINVAL;
 244         }
 245         switch (info->size) {
 246         case 4:
 247                 *u.ptr32 = num;
 248                 break;
 249         case 2:
 250                 *u.ptr16 = num;
 251                 break;
 252         case 1:
 253                 *u.ptr8 = num;
 254                 break;
 255         }
 256         return 0;
 257 }
 258
 259 static errcode_t parse_int(struct field_set_info *info, char *arg)
 260 {
 261         long    num;
 262         char *tmp;
 263         __s32   *ptr32;
 264         __s16   *ptr16;
 265         __s8    *ptr8;
 266
 267         num = strtol(arg, &tmp, 0);
 268         if (*tmp) {
 269                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 270                         arg, info->name);
 271                 return EINVAL;
 272         }
 273         switch (info->size) {
 274         case 4:
 275                 ptr32 = (__s32 *) info->ptr;
 276                 *ptr32 = num;
 277                 break;
 278         case 2:
 279                 ptr16 = (__s16 *) info->ptr;
 280                 *ptr16 = num;
 281                 break;
 282         case 1:
 283                 ptr8 = (__s8 *) info->ptr;
 284                 *ptr8 = num;
 285                 break;
 286         }
 287         return 0;
 288 }
 289
 290 static errcode_t parse_string(struct field_set_info *info, char *arg)
 291 {
 292         char    *cp = (char *) info->ptr;
 293
 294         if (strlen(arg) >= info->size) {
 295                 fprintf(stderr, "Error maximum size for %s is %d.\n",
 296                         info->name, info->size);
 297                 return EINVAL;
 298         }
 299         strcpy(cp, arg);
 300         return 0;
 301 }
 302
 303 static errcode_t parse_time(struct field_set_info *info, char *arg)
 304 {
 305         time_t          t;
 306         __u32           *ptr32;
 307
 308         ptr32 = (__u32 *) info->ptr;
 309
 310         t = string_to_time(arg);
 311
 312         if (t == ((time_t) -1)) {
 313                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 314                         arg, info->name);
 315                 return EINVAL;
 316         }
 317         *ptr32 = t;
 318         return 0;
 319 }
 320
 321 static errcode_t parse_uuid(struct field_set_info *info, char *arg)
 322 {
 323         unsigned char * p = (unsigned char *) info->ptr;
 324
 325         if ((strcasecmp(arg, "null") == 0) ||
 326             (strcasecmp(arg, "clear") == 0)) {
 327                 uuid_clear(p);
 328         } else if (strcasecmp(arg, "time") == 0) {
 329                 uuid_generate_time(p);
 330         } else if (strcasecmp(arg, "random") == 0) {
 331                 uuid_generate(p);
 332         } else if (uuid_parse(arg, p)) {
 333                 fprintf(stderr, "Invalid UUID format: %s\n", arg);
 334                 return EINVAL;
 335         }
 336         return 0;
 337 }
 338
 339 static errcode_t parse_hashalg(struct field_set_info *info, char *arg)
 340 {
 341         int     hashv;
 342         unsigned char   *p = (unsigned char *) info->ptr;
 343
 344         hashv = e2p_string2hash(arg);
 345         if (hashv < 0) {
 346                 fprintf(stderr, "Invalid hash algorithm: %s\n", arg);
 347                 return EINVAL;
 348         }
 349         *p = hashv;
 350         return 0;
 351 }
 352
 353 static errcode_t parse_bmap(struct field_set_info *info, char *arg)
 354 {
 355         unsigned long   num;
 356         blk_t           blk;
 357         errcode_t       retval;
 358         char            *tmp;
 359
 360         num = strtoul(arg, &tmp, 0);
 361         if (*tmp) {
 362                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 363                         arg, info->name);
 364                 return EINVAL;
 365         }
 366         blk = num;
 367
 368         retval = ext2fs_bmap(current_fs, set_ino, &set_inode, 0, BMAP_SET,
 369                              array_idx, &blk);
 370         if (retval) {
 371                 com_err("set_inode", retval, "while setting block map");
 372         }
 373         return retval;
 374 }
 375
 376
 377 static void print_possible_fields(struct field_set_info *fields)
 378 {
 379         struct field_set_info *ss;
 380         const char      *type, *cmd;
 381         FILE *f;
 382         char name[40], idx[40];
 383
 384         if (fields == super_fields) {
 385                 type = "Superblock";
 386                 cmd = "set_super_value";
 387         } else if (fields == inode_fields) {
 388                 type = "Inode";
 389                 cmd = "set_inode";
 390         } else {
 391                 type = "Block group descriptor";
 392                 cmd = "set_block_group";
 393         }
 394         f = open_pager();
 395
 396         fprintf(f, "%s fields supported by the %s command:\n", type, cmd);
 397
 398         for (ss = fields ; ss->name ; ss++) {
 399                 type = "unknown";
 400                 if (ss->func == parse_string)
 401                         type = "string";
 402                 else if (ss->func == parse_int)
 403                         type = "integer";
 404                 else if (ss->func == parse_uint)
 405                         type = "unsigned integer";
 406                 else if (ss->func == parse_uuid)
 407                         type = "UUID";
 408                 else if (ss->func == parse_hashalg)
 409                         type = "hash algorithm";
 410                 else if (ss->func == parse_time)
 411                         type = "date/time";
 412                 else if (ss->func == parse_bmap)
 413                         type = "set physical->logical block map";
 414                 strcpy(name, ss->name);
 415                 if (ss->flags & FLAG_ARRAY) {
 416                         if (ss->max_idx > 0)
 417                                 sprintf(idx, "[%d]", ss->max_idx);
 418                         else
 419                                 strcpy(idx, "[]");
 420                         strcat(name, idx);
 421                 }
 422                 fprintf(f, "\t%-20s\t%s\n", name, type);
 423         }
 424         close_pager(f);
 425 }
 426
 427
 428 void do_set_super(int argc, char *argv[])
 429 {
 430         const char *usage = "<field> <value>\n"
 431                 "\t\"set_super_value -l\" will list the names of "
 432                 "superblock fields\n\twhich can be set.";
 433         static struct field_set_info *ss;
 434
 435         if ((argc == 2) && !strcmp(argv[1], "-l")) {
 436                 print_possible_fields(super_fields);
 437                 return;
 438         }
 439
 440         if (common_args_process(argc, argv, 3, 3, "set_super_value",
 441                                 usage, CHECK_FS_RW))
 442                 return;
 443
 444         if ((ss = find_field(super_fields, argv[1])) == 0) {
 445                 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
 446                 return;
 447         }
 448         set_sb = *current_fs->super;
 449         if (ss->func(ss, argv[2]) == 0) {
 450                 *current_fs->super = set_sb;
 451                 ext2fs_mark_super_dirty(current_fs);
 452         }
 453 }
 454
 455 void do_set_inode(int argc, char *argv[])
 456 {
 457         const char *usage = "<inode> <field> <value>\n"
 458                 "\t\"set_inode_field -l\" will list the names of "
 459                 "the fields in an ext2 inode\n\twhich can be set.";
 460         static struct field_set_info *ss;
 461
 462         if ((argc == 2) && !strcmp(argv[1], "-l")) {
 463                 print_possible_fields(inode_fields);
 464                 return;
 465         }
 466
 467         if (common_args_process(argc, argv, 4, 4, "set_inode",
 468                                 usage, CHECK_FS_RW))
 469                 return;
 470
 471         if ((ss = find_field(inode_fields, argv[2])) == 0) {
 472                 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
 473                 return;
 474         }
 475
 476         set_ino = string_to_inode(argv[1]);
 477         if (!set_ino)
 478                 return;
 479
 480         if (debugfs_read_inode(set_ino, &set_inode, argv[1]))
 481                 return;
 482
 483         if (ss->func(ss, argv[3]) == 0) {
 484                 if (debugfs_write_inode(set_ino, &set_inode, argv[1]))
 485                         return;
 486         }
 487 }
 488
 489 void do_set_block_group_descriptor(int argc, char *argv[])
 490 {
 491         const char *usage = "<bg number> <field> <value>\n"
 492                 "\t\"set_block_group_descriptor -l\" will list the names of "
 493                 "the fields in a block group descriptor\n\twhich can be set.";
 494         struct field_set_info   *ss;
 495         dgrp_t                  set_bg;
 496         char                    *end;
 497
 498         if ((argc == 2) && !strcmp(argv[1], "-l")) {
 499                 print_possible_fields(ext2_bg_fields);
 500                 return;
 501         }
 502
 503         if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor",
 504                                 usage, CHECK_FS_RW))
 505                 return;
 506
 507         set_bg = strtoul(argv[1], &end, 0);
 508         if (*end) {
 509                 com_err(argv[0], 0, "invalid block group number: %s", argv[1]);
 510                 return;
 511         }
 512
 513         if (set_bg >= current_fs->group_desc_count) {
 514                 com_err(argv[0], 0, "block group number too big: %d", set_bg);
 515                 return;
 516         }
 517
 518
 519         if ((ss = find_field(ext2_bg_fields, argv[2])) == 0) {
 520                 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
 521                 return;
 522         }
 523
 524         set_gd = current_fs->group_desc[set_bg];
 525
 526         if (ss->func(ss, argv[3]) == 0) {
 527                 current_fs->group_desc[set_bg] = set_gd;
 528                 ext2fs_mark_super_dirty(current_fs);
 529         }
 530 }