e2fsprogs/tune2fs.c

   1 /*
   2  * tune2fs.c - Change the file system parameters on an ext2 file system
   3  *
   4  * Copyright (C) 1992, 1993, 1994  Remy Card <card@masi.ibp.fr>
   5  *                                 Laboratoire MASI, Institut Blaise Pascal
   6  *                                 Universite Pierre et Marie Curie (Paris VI)
   7  *
   8  * Copyright 1995, 1996, 1997, 1998, 1999, 2000 by Theodore Ts'o.
   9  *
  10  * %Begin-Header%
  11  * This file may be redistributed under the terms of the GNU Public
  12  * License.
  13  * %End-Header%
  14  */
  15
  16 /*
  17  * History:
  18  * 93/06/01     - Creation
  19  * 93/10/31     - Added the -c option to change the maximal mount counts
  20  * 93/12/14     - Added -l flag to list contents of superblock
  21  *                M.J.E. Mol (marcel@duteca.et.tudelft.nl)
  22  *                F.W. ten Wolde (franky@duteca.et.tudelft.nl)
  23  * 93/12/29     - Added the -e option to change errors behavior
  24  * 94/02/27     - Ported to use the ext2fs library
  25  * 94/03/06     - Added the checks interval from Uwe Ohse (uwe@tirka.gun.de)
  26  */
  27
  28 #include <fcntl.h>
  29 #include <grp.h>
  30 #ifdef HAVE_GETOPT_H
  31 #include <getopt.h>
  32 #else
  33 extern char *optarg;
  34 extern int optind;
  35 #endif
  36 #include <pwd.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <time.h>
  41 #include <unistd.h>
  42 #include <sys/types.h>
  43
  44 #include "e2fsbb.h"
  45 #include "ext2fs/ext2_fs.h"
  46 #include "ext2fs/ext2fs.h"
  47 #include "uuid/uuid.h"
  48 #include "e2p/e2p.h"
  49 #include "ext2fs/jfs_user.h"
  50 #include "util.h"
  51 #include "blkid/blkid.h"
  52
  53 static char * device_name;
  54 static char * new_label, *new_last_mounted, *new_UUID;
  55 static char * io_options;
  56 static int c_flag, C_flag, e_flag, f_flag, g_flag, i_flag, l_flag, L_flag;
  57 static int m_flag, M_flag, r_flag, s_flag = -1, u_flag, U_flag, T_flag;
  58 static time_t last_check_time;
  59 static int print_label;
  60 static int max_mount_count, mount_count, mount_flags;
  61 static unsigned long interval, reserved_ratio, reserved_blocks;
  62 static unsigned long resgid, resuid;
  63 static unsigned short errors;
  64 static int open_flag;
  65 static char *features_cmd;
  66 static char *mntopts_cmd;
  67
  68 static int journal_size, journal_flags;
  69 static char *journal_device;
  70
  71 static const char *please_fsck = "Please run e2fsck on the filesystem\n";
  72
  73 static __u32 ok_features[3] = {
  74         EXT3_FEATURE_COMPAT_HAS_JOURNAL | EXT2_FEATURE_COMPAT_DIR_INDEX,
  75         EXT2_FEATURE_INCOMPAT_FILETYPE,
  76         EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER
  77 };
  78
  79 /*
  80  * Remove an external journal from the filesystem
  81  */
  82 static void remove_journal_device(ext2_filsys fs)
  83 {
  84         char            *journal_path;
  85         ext2_filsys     jfs;
  86         char            buf[1024];
  87         journal_superblock_t    *jsb;
  88         int             i, nr_users;
  89         errcode_t       retval;
  90         int             commit_remove_journal = 0;
  91         io_manager      io_ptr;
  92
  93         if (f_flag)
  94                 commit_remove_journal = 1; /* force removal even if error */
  95
  96         uuid_unparse(fs->super->s_journal_uuid, buf);
  97         journal_path = blkid_get_devname(NULL, "UUID", buf);
  98
  99         if (!journal_path) {
 100                 journal_path =
 101                         ext2fs_find_block_device(fs->super->s_journal_dev);
 102                 if (!journal_path)
 103                         return;
 104         }
 105
 106         io_ptr = unix_io_manager;
 107         retval = ext2fs_open(journal_path, EXT2_FLAG_RW|
 108                              EXT2_FLAG_JOURNAL_DEV_OK, 0,
 109                              fs->blocksize, io_ptr, &jfs);
 110         if (retval) {
 111                 bb_error_msg("Failed to open external journal");
 112                 goto no_valid_journal;
 113         }
 114         if (!(jfs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
 115                 bb_error_msg("%s is not a journal device", journal_path);
 116                 goto no_valid_journal;
 117         }
 118
 119         /* Get the journal superblock */
 120         if ((retval = io_channel_read_blk(jfs->io, 1, -1024, buf))) {
 121                 bb_error_msg("Failed to read journal superblock");
 122                 goto no_valid_journal;
 123         }
 124
 125         jsb = (journal_superblock_t *) buf;
 126         if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) ||
 127             (jsb->s_header.h_blocktype != (unsigned) ntohl(JFS_SUPERBLOCK_V2))) {
 128                 bb_error_msg("Journal superblock not found!");
 129                 goto no_valid_journal;
 130         }
 131
 132         /* Find the filesystem UUID */
 133         nr_users = ntohl(jsb->s_nr_users);
 134         for (i=0; i < nr_users; i++) {
 135                 if (memcmp(fs->super->s_uuid,
 136                            &jsb->s_users[i*16], 16) == 0)
 137                         break;
 138         }
 139         if (i >= nr_users) {
 140                 bb_error_msg("Filesystem's UUID not found on journal device");
 141                 commit_remove_journal = 1;
 142                 goto no_valid_journal;
 143         }
 144         nr_users--;
 145         for (i=0; i < nr_users; i++)
 146                 memcpy(&jsb->s_users[i*16], &jsb->s_users[(i+1)*16], 16);
 147         jsb->s_nr_users = htonl(nr_users);
 148
 149         /* Write back the journal superblock */
 150         if ((retval = io_channel_write_blk(jfs->io, 1, -1024, buf))) {
 151                 bb_error_msg("Failed to write journal superblock");
 152                 goto no_valid_journal;
 153         }
 154
 155         commit_remove_journal = 1;
 156
 157 no_valid_journal:
 158         if (commit_remove_journal == 0)
 159                 bb_error_msg_and_die("Journal NOT removed");
 160         fs->super->s_journal_dev = 0;
 161         uuid_clear(fs->super->s_journal_uuid);
 162         ext2fs_mark_super_dirty(fs);
 163         puts("Journal removed");
 164         free(journal_path);
 165 }
 166
 167 /* Helper function for remove_journal_inode */
 168 static int release_blocks_proc(ext2_filsys fs, blk_t *blocknr,
 169                                int blockcnt EXT2FS_ATTR((unused)),
 170                                void *private EXT2FS_ATTR((unused)))
 171 {
 172         blk_t   block;
 173         int     group;
 174
 175         block = *blocknr;
 176         ext2fs_unmark_block_bitmap(fs->block_map,block);
 177         group = ext2fs_group_of_blk(fs, block);
 178         fs->group_desc[group].bg_free_blocks_count++;
 179         fs->super->s_free_blocks_count++;
 180         return 0;
 181 }
 182
 183 /*
 184  * Remove the journal inode from the filesystem
 185  */
 186 static void remove_journal_inode(ext2_filsys fs)
 187 {
 188         struct ext2_inode       inode;
 189         errcode_t               retval;
 190         ino_t                   ino = fs->super->s_journal_inum;
 191
 192         retval = ext2fs_read_inode(fs, ino,  &inode);
 193         if (retval)
 194                 bb_error_msg_and_die("Failed to read journal inode");
 195         if (ino == EXT2_JOURNAL_INO) {
 196                 retval = ext2fs_read_bitmaps(fs);
 197                 if (retval)
 198                         bb_error_msg_and_die("Failed to read bitmaps");
 199                 retval = ext2fs_block_iterate(fs, ino, 0, NULL,
 200                                               release_blocks_proc, NULL);
 201                 if (retval)
 202                         bb_error_msg_and_die("Failed clearing journal inode");
 203                 memset(&inode, 0, sizeof(inode));
 204                 ext2fs_mark_bb_dirty(fs);
 205                 fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
 206         } else
 207                 inode.i_flags &= ~EXT2_IMMUTABLE_FL;
 208         retval = ext2fs_write_inode(fs, ino, &inode);
 209         if (retval)
 210                 bb_error_msg_and_die("Failed writing journal inode");
 211         fs->super->s_journal_inum = 0;
 212         ext2fs_mark_super_dirty(fs);
 213 }
 214
 215 /*
 216  * Update the default mount options
 217  */
 218 static void update_mntopts(ext2_filsys fs, char *mntopts)
 219 {
 220         struct ext2_super_block *sb= fs->super;
 221
 222         if (e2p_edit_mntopts(mntopts, &sb->s_default_mount_opts, ~0))
 223                 bb_error_msg_and_die("Invalid mount option set: %s", mntopts);
 224         ext2fs_mark_super_dirty(fs);
 225 }
 226
 227 /*
 228  * Update the feature set as provided by the user.
 229  */
 230 static void update_feature_set(ext2_filsys fs, char *features)
 231 {
 232         int sparse, old_sparse, filetype, old_filetype;
 233         int journal, old_journal, dxdir, old_dxdir;
 234         struct ext2_super_block *sb= fs->super;
 235         __u32   old_compat, old_incompat, old_ro_compat;
 236
 237         old_compat = sb->s_feature_compat;
 238         old_ro_compat = sb->s_feature_ro_compat;
 239         old_incompat = sb->s_feature_incompat;
 240
 241         old_sparse = sb->s_feature_ro_compat &
 242                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 243         old_filetype = sb->s_feature_incompat &
 244                 EXT2_FEATURE_INCOMPAT_FILETYPE;
 245         old_journal = sb->s_feature_compat &
 246                 EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 247         old_dxdir = sb->s_feature_compat &
 248                 EXT2_FEATURE_COMPAT_DIR_INDEX;
 249         if (e2p_edit_feature(features, &sb->s_feature_compat, ok_features))
 250                 bb_error_msg_and_die("Invalid filesystem option set: %s", features);
 251         sparse = sb->s_feature_ro_compat &
 252                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 253         filetype = sb->s_feature_incompat &
 254                 EXT2_FEATURE_INCOMPAT_FILETYPE;
 255         journal = sb->s_feature_compat &
 256                 EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 257         dxdir = sb->s_feature_compat &
 258                 EXT2_FEATURE_COMPAT_DIR_INDEX;
 259         if (old_journal && !journal) {
 260                 if ((mount_flags & EXT2_MF_MOUNTED) &&
 261                     !(mount_flags & EXT2_MF_READONLY)) {
 262                         bb_error_msg_and_die(
 263                                 "The has_journal flag may only be "
 264                                 "cleared when the filesystem is\n"
 265                                 "unmounted or mounted "
 266                                 "read-only");
 267                 }
 268                 if (sb->s_feature_incompat &
 269                     EXT3_FEATURE_INCOMPAT_RECOVER) {
 270                         bb_error_msg_and_die(
 271                                 "The needs_recovery flag is set.  "
 272                                 "Please run e2fsck before clearing\n"
 273                                 "the has_journal flag.");
 274                 }
 275                 if (sb->s_journal_inum) {
 276                         remove_journal_inode(fs);
 277                 }
 278                 if (sb->s_journal_dev) {
 279                         remove_journal_device(fs);
 280                 }
 281         }
 282         if (journal && !old_journal) {
 283                 /*
 284                  * If adding a journal flag, let the create journal
 285                  * code below handle creating setting the flag and
 286                  * creating the journal.  We supply a default size if
 287                  * necessary.
 288                  */
 289                 if (!journal_size)
 290                         journal_size = -1;
 291                 sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 292         }
 293         if (dxdir && !old_dxdir) {
 294                 if (!sb->s_def_hash_version)
 295                         sb->s_def_hash_version = EXT2_HASH_TEA;
 296                 if (uuid_is_null((unsigned char *) sb->s_hash_seed))
 297                         uuid_generate((unsigned char *) sb->s_hash_seed);
 298         }
 299
 300         if (sb->s_rev_level == EXT2_GOOD_OLD_REV &&
 301             (sb->s_feature_compat || sb->s_feature_ro_compat ||
 302              sb->s_feature_incompat))
 303                 ext2fs_update_dynamic_rev(fs);
 304         if ((sparse != old_sparse) ||
 305             (filetype != old_filetype)) {
 306                 sb->s_state &= ~EXT2_VALID_FS;
 307                 printf("\n%s\n", please_fsck);
 308         }
 309         if ((old_compat != sb->s_feature_compat) ||
 310             (old_ro_compat != sb->s_feature_ro_compat) ||
 311             (old_incompat != sb->s_feature_incompat))
 312                 ext2fs_mark_super_dirty(fs);
 313 }
 314
 315 /*
 316  * Add a journal to the filesystem.
 317  */
 318 static void add_journal(ext2_filsys fs)
 319 {
 320         unsigned long journal_blocks;
 321         errcode_t       retval;
 322         ext2_filsys     jfs;
 323         io_manager      io_ptr;
 324
 325         if (fs->super->s_feature_compat &
 326             EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
 327                 bb_error_msg("The filesystem already has a journal");
 328                 goto err;
 329         }
 330         if (journal_device) {
 331                 check_plausibility(journal_device);
 332                 check_mount(journal_device, 0, "journal");
 333                 io_ptr = unix_io_manager;
 334                 retval = ext2fs_open(journal_device, EXT2_FLAG_RW|
 335                                      EXT2_FLAG_JOURNAL_DEV_OK, 0,
 336                                      fs->blocksize, io_ptr, &jfs);
 337                 if (retval) {
 338                         bb_error_msg("Failed to open journal on %s", journal_device);
 339                         goto err;
 340                 }
 341                 printf("Creating journal on device %s: ", journal_device);
 342                 fflush(stdout);
 343
 344                 retval = ext2fs_add_journal_device(fs, jfs);
 345                 ext2fs_close(jfs);
 346                 if (retval) {
 347                         bb_error_msg("Failed to add filesystem to journal on %s", journal_device);
 348                         goto err;
 349                 }
 350                 puts("done");
 351         } else if (journal_size) {
 352                 fputs("Creating journal inode: ", stdout);
 353                 fflush(stdout);
 354                 journal_blocks = figure_journal_size(journal_size, fs);
 355
 356                 retval = ext2fs_add_journal_inode(fs, journal_blocks,
 357                                                   journal_flags);
 358                 if (retval)
 359                         bb_error_msg_and_die("Failed to create journal file");
 360                 else
 361                         puts("done");
 362                 /*
 363                  * If the filesystem wasn't mounted, we need to force
 364                  * the block group descriptors out.
 365                  */
 366                 if ((mount_flags & EXT2_MF_MOUNTED) == 0)
 367                         fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
 368         }
 369         print_check_message(fs);
 370         return;
 371
 372 err:
 373         if (journal_device)
 374                 free(journal_device);
 375         exit(1);
 376 }
 377
 378
 379 static void parse_e2label_options(int argc, char ** argv)
 380 {
 381         if ((argc < 2) || (argc > 3))
 382                 bb_show_usage();
 383         io_options = strchr(argv[1], '?');
 384         if (io_options)
 385                 *io_options++ = 0;
 386         device_name = blkid_get_devname(NULL, argv[1], NULL);
 387         if (!device_name)
 388                 bb_error_msg_and_die("Unable to resolve '%s'", argv[1]);
 389         if (argc == 3) {
 390                 open_flag = EXT2_FLAG_RW | EXT2_FLAG_JOURNAL_DEV_OK;
 391                 L_flag = 1;
 392                 new_label = argv[2];
 393         } else
 394                 print_label++;
 395 }
 396
 397 static time_t parse_time(char *str)
 398 {
 399         struct  tm      ts;
 400
 401         if (strcmp(str, "now") == 0) {
 402                 return (time(0));
 403         }
 404         memset(&ts, 0, sizeof(ts));
 405 #ifdef HAVE_STRPTIME
 406         strptime(str, "%Y%m%d%H%M%S", &ts);
 407 #else
 408         sscanf(str, "%4d%2d%2d%2d%2d%2d", &ts.tm_year, &ts.tm_mon,
 409                &ts.tm_mday, &ts.tm_hour, &ts.tm_min, &ts.tm_sec);
 410         ts.tm_year -= 1900;
 411         ts.tm_mon -= 1;
 412         if (ts.tm_year < 0 || ts.tm_mon < 0 || ts.tm_mon > 11 ||
 413             ts.tm_mday < 0 || ts.tm_mday > 31 || ts.tm_hour > 23 ||
 414             ts.tm_min > 59 || ts.tm_sec > 61)
 415                 ts.tm_mday = 0;
 416 #endif
 417         if (ts.tm_mday == 0) {
 418                 bb_error_msg_and_die("Couldn't parse date/time specifier: %s", str);
 419         }
 420         return (mktime(&ts));
 421 }
 422
 423 static void parse_tune2fs_options(int argc, char **argv)
 424 {
 425         int c;
 426         char * tmp;
 427         struct group * gr;
 428         struct passwd * pw;
 429
 430         printf("tune2fs %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
 431         while ((c = getopt(argc, argv, "c:e:fg:i:jlm:o:r:s:u:C:J:L:M:O:T:U:")) != EOF)
 432                 switch (c)
 433                 {
 434                         case 'c':
 435                                 max_mount_count = strtol (optarg, &tmp, 0);
 436                                 if (*tmp || max_mount_count > 16000) {
 437                                         bb_error_msg_and_die("bad mounts count - %s", optarg);
 438                                 }
 439                                 if (max_mount_count == 0)
 440                                         max_mount_count = -1;
 441                                 c_flag = 1;
 442                                 open_flag = EXT2_FLAG_RW;
 443                                 break;
 444                         case 'C':
 445                                 mount_count = strtoul (optarg, &tmp, 0);
 446                                 if (*tmp || mount_count > 16000) {
 447                                         bb_error_msg_and_die("bad mounts count - %s", optarg);
 448                                 }
 449                                 C_flag = 1;
 450                                 open_flag = EXT2_FLAG_RW;
 451                                 break;
 452                         case 'e':
 453                                 if (strcmp (optarg, "continue") == 0)
 454                                         errors = EXT2_ERRORS_CONTINUE;
 455                                 else if (strcmp (optarg, "remount-ro") == 0)
 456                                         errors = EXT2_ERRORS_RO;
 457                                 else if (strcmp (optarg, "panic") == 0)
 458                                         errors = EXT2_ERRORS_PANIC;
 459                                 else {
 460                                         bb_error_msg_and_die("bad error behavior - %s", optarg);
 461                                 }
 462                                 e_flag = 1;
 463                                 open_flag = EXT2_FLAG_RW;
 464                                 break;
 465                         case 'f': /* Force */
 466                                 f_flag = 1;
 467                                 break;
 468                         case 'g':
 469                                 resgid = strtoul (optarg, &tmp, 0);
 470                                 if (*tmp) {
 471                                         gr = getgrnam (optarg);
 472                                         if (gr == NULL)
 473                                                 tmp = optarg;
 474                                         else {
 475                                                 resgid = gr->gr_gid;
 476                                                 *tmp =0;
 477                                         }
 478                                 }
 479                                 if (*tmp) {
 480                                         bb_error_msg_and_die("bad gid/group name - %s", optarg);
 481                                 }
 482                                 g_flag = 1;
 483                                 open_flag = EXT2_FLAG_RW;
 484                                 break;
 485                         case 'i':
 486                                 interval = strtoul (optarg, &tmp, 0);
 487                                 switch (*tmp) {
 488                                 case 's':
 489                                         tmp++;
 490                                         break;
 491                                 case '\0':
 492                                 case 'd':
 493                                 case 'D': /* days */
 494                                         interval *= 86400;
 495                                         if (*tmp != '\0')
 496                                                 tmp++;
 497                                         break;
 498                                 case 'm':
 499                                 case 'M': /* months! */
 500                                         interval *= 86400 * 30;
 501                                         tmp++;
 502                                         break;
 503                                 case 'w':
 504                                 case 'W': /* weeks */
 505                                         interval *= 86400 * 7;
 506                                         tmp++;
 507                                         break;
 508                                 }
 509                                 if (*tmp || interval > (365 * 86400)) {
 510                                         bb_error_msg_and_die("bad interval - %s", optarg);
 511                                 }
 512                                 i_flag = 1;
 513                                 open_flag = EXT2_FLAG_RW;
 514                                 break;
 515                         case 'j':
 516                                 if (!journal_size)
 517                                         journal_size = -1;
 518                                 open_flag = EXT2_FLAG_RW;
 519                                 break;
 520                         case 'J':
 521                                 parse_journal_opts(&journal_device, &journal_flags, &journal_size, optarg);
 522                                 open_flag = EXT2_FLAG_RW;
 523                                 break;
 524                         case 'l':
 525                                 l_flag = 1;
 526                                 break;
 527                         case 'L':
 528                                 new_label = optarg;
 529                                 L_flag = 1;
 530                                 open_flag = EXT2_FLAG_RW |
 531                                         EXT2_FLAG_JOURNAL_DEV_OK;
 532                                 break;
 533                         case 'm':
 534                                 reserved_ratio = strtoul (optarg, &tmp, 0);
 535                                 if (*tmp || reserved_ratio > 50) {
 536                                         bb_error_msg_and_die("bad reserved block ratio - %s", optarg);
 537                                 }
 538                                 m_flag = 1;
 539                                 open_flag = EXT2_FLAG_RW;
 540                                 break;
 541                         case 'M':
 542                                 new_last_mounted = optarg;
 543                                 M_flag = 1;
 544                                 open_flag = EXT2_FLAG_RW;
 545                                 break;
 546                         case 'o':
 547                                 if (mntopts_cmd) {
 548                                         bb_error_msg_and_die("-o may only be specified once");
 549                                 }
 550                                 mntopts_cmd = optarg;
 551                                 open_flag = EXT2_FLAG_RW;
 552                                 break;
 553
 554                         case 'O':
 555                                 if (features_cmd) {
 556                                         bb_error_msg_and_die("-O may only be specified once");
 557                                 }
 558                                 features_cmd = optarg;
 559                                 open_flag = EXT2_FLAG_RW;
 560                                 break;
 561                         case 'r':
 562                                 reserved_blocks = strtoul (optarg, &tmp, 0);
 563                                 if (*tmp) {
 564                                         bb_error_msg_and_die("bad reserved blocks count - %s", optarg);
 565                                 }
 566                                 r_flag = 1;
 567                                 open_flag = EXT2_FLAG_RW;
 568                                 break;
 569                         case 's':
 570                                 s_flag = atoi(optarg);
 571                                 open_flag = EXT2_FLAG_RW;
 572                                 break;
 573                         case 'T':
 574                                 T_flag = 1;
 575                                 last_check_time = parse_time(optarg);
 576                                 open_flag = EXT2_FLAG_RW;
 577                                 break;
 578                         case 'u':
 579                                 resuid = strtoul (optarg, &tmp, 0);
 580                                 if (*tmp) {
 581                                         pw = getpwnam (optarg);
 582                                         if (pw == NULL)
 583                                                 tmp = optarg;
 584                                         else {
 585                                                 resuid = pw->pw_uid;
 586                                                 *tmp = 0;
 587                                         }
 588                                 }
 589                                 if (*tmp) {
 590                                         bb_error_msg_and_die("bad uid/user name - %s", optarg);
 591                                 }
 592                                 u_flag = 1;
 593                                 open_flag = EXT2_FLAG_RW;
 594                                 break;
 595                         case 'U':
 596                                 new_UUID = optarg;
 597                                 U_flag = 1;
 598                                 open_flag = EXT2_FLAG_RW |
 599                                         EXT2_FLAG_JOURNAL_DEV_OK;
 600                                 break;
 601                         default:
 602                                 bb_show_usage();
 603                 }
 604         if (optind < argc - 1 || optind == argc)
 605                 bb_show_usage();
 606         if (!open_flag && !l_flag)
 607                 bb_show_usage();
 608         io_options = strchr(argv[optind], '?');
 609         if (io_options)
 610                 *io_options++ = 0;
 611         device_name = blkid_get_devname(NULL, argv[optind], NULL);
 612         if (!device_name)
 613                 bb_error_msg_and_die("Unable to resolve '%s'", argv[optind]);
 614 }
 615
 616 static void do_findfs(int argc, char **argv)
 617 {
 618         char *dev;
 619
 620         if ((argc != 2) ||
 621             (strncmp(argv[1], "LABEL=", 6) && strncmp(argv[1], "UUID=", 5)))
 622                 bb_show_usage();
 623         dev = blkid_get_devname(NULL, argv[1], NULL);
 624         if (!dev)
 625                 bb_error_msg_and_die("Unable to resolve '%s'", argv[1]);
 626         puts(dev);
 627         exit(0);
 628 }
 629
 630 int tune2fs_main(int argc, char **argv)
 631 {
 632         errcode_t retval;
 633         ext2_filsys fs;
 634         struct ext2_super_block *sb;
 635         io_manager io_ptr;
 636         char *program_name = basename(argv[0]);
 637
 638         if (strcmp(program_name, "findfs") == 0)
 639                 do_findfs(argc, argv);
 640         if (strcmp(program_name, "e2label") == 0)
 641                 parse_e2label_options(argc, argv);
 642         else
 643                 parse_tune2fs_options(argc, argv);
 644
 645         io_ptr = unix_io_manager;
 646         retval = ext2fs_open2(device_name, io_options, open_flag,
 647                               0, 0, io_ptr, &fs);
 648         if (retval)
 649                 bb_error_msg_and_die("No valid superblock on %s", device_name);
 650         sb = fs->super;
 651         if (print_label) {
 652                 /* For e2label emulation */
 653                 printf("%.*s\n", (int) sizeof(sb->s_volume_name),
 654                        sb->s_volume_name);
 655                 exit(0);
 656         }
 657         retval = ext2fs_check_if_mounted(device_name, &mount_flags);
 658         if (retval)
 659                 bb_error_msg_and_die("Could not determine if %s is mounted", device_name);
 660         /* Normally we only need to write out the superblock */
 661         fs->flags |= EXT2_FLAG_SUPER_ONLY;
 662
 663         if (c_flag) {
 664                 sb->s_max_mnt_count = max_mount_count;
 665                 ext2fs_mark_super_dirty(fs);
 666                 printf("Setting maximal mount count to %d\n", max_mount_count);
 667         }
 668         if (C_flag) {
 669                 sb->s_mnt_count = mount_count;
 670                 ext2fs_mark_super_dirty(fs);
 671                 printf("Setting current mount count to %d\n", mount_count);
 672         }
 673         if (e_flag) {
 674                 sb->s_errors = errors;
 675                 ext2fs_mark_super_dirty(fs);
 676                 printf("Setting error behavior to %d\n", errors);
 677         }
 678         if (g_flag) {
 679                 sb->s_def_resgid = resgid;
 680                 ext2fs_mark_super_dirty(fs);
 681                 printf("Setting reserved blocks gid to %lu\n", resgid);
 682         }
 683         if (i_flag) {
 684                 sb->s_checkinterval = interval;
 685                 ext2fs_mark_super_dirty(fs);
 686                 printf("Setting interval between check %lu seconds\n", interval);
 687         }
 688         if (m_flag) {
 689                 sb->s_r_blocks_count = (sb->s_blocks_count / 100)
 690                         * reserved_ratio;
 691                 ext2fs_mark_super_dirty(fs);
 692                 printf("Setting reserved blocks percentage to %lu (%u blocks)\n",
 693                         reserved_ratio, sb->s_r_blocks_count);
 694         }
 695         if (r_flag) {
 696                 if (reserved_blocks >= sb->s_blocks_count/2)
 697                         bb_error_msg_and_die("reserved blocks count is too big (%lu)", reserved_blocks);
 698                 sb->s_r_blocks_count = reserved_blocks;
 699                 ext2fs_mark_super_dirty(fs);
 700                 printf("Setting reserved blocks count to %lu\n", reserved_blocks);
 701         }
 702         if (s_flag == 1) {
 703                 if (sb->s_feature_ro_compat &
 704                     EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)
 705                         bb_error_msg("\nThe filesystem already has sparse superblocks\n");
 706                 else {
 707                         sb->s_feature_ro_compat |=
 708                                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 709                         sb->s_state &= ~EXT2_VALID_FS;
 710                         ext2fs_mark_super_dirty(fs);
 711                         printf("\nSparse superblock flag set.  %s", please_fsck);
 712                 }
 713         }
 714         if (s_flag == 0) {
 715                 if (!(sb->s_feature_ro_compat &
 716                       EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER))
 717                         bb_error_msg("\nThe filesystem already has sparse superblocks disabled\n");
 718                 else {
 719                         sb->s_feature_ro_compat &=
 720                                 ~EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 721                         sb->s_state &= ~EXT2_VALID_FS;
 722                         fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
 723                         ext2fs_mark_super_dirty(fs);
 724                         printf("\nSparse superblock flag cleared.  %s", please_fsck);
 725                 }
 726         }
 727         if (T_flag) {
 728                 sb->s_lastcheck = last_check_time;
 729                 ext2fs_mark_super_dirty(fs);
 730                 printf("Setting time filesystem last checked to %s\n",
 731                        ctime(&last_check_time));
 732         }
 733         if (u_flag) {
 734                 sb->s_def_resuid = resuid;
 735                 ext2fs_mark_super_dirty(fs);
 736                 printf("Setting reserved blocks uid to %lu\n", resuid);
 737         }
 738         if (L_flag) {
 739                 if (strlen(new_label) > sizeof(sb->s_volume_name))
 740                         bb_error_msg("Warning: label too long, truncating\n");
 741                 memset(sb->s_volume_name, 0, sizeof(sb->s_volume_name));
 742                 strncpy(sb->s_volume_name, new_label,
 743                         sizeof(sb->s_volume_name));
 744                 ext2fs_mark_super_dirty(fs);
 745         }
 746         if (M_flag) {
 747                 memset(sb->s_last_mounted, 0, sizeof(sb->s_last_mounted));
 748                 strncpy(sb->s_last_mounted, new_last_mounted,
 749                         sizeof(sb->s_last_mounted));
 750                 ext2fs_mark_super_dirty(fs);
 751         }
 752         if (mntopts_cmd)
 753                 update_mntopts(fs, mntopts_cmd);
 754         if (features_cmd)
 755                 update_feature_set(fs, features_cmd);
 756         if (journal_size || journal_device)
 757                 add_journal(fs);
 758
 759         if (U_flag) {
 760                 if ((strcasecmp(new_UUID, "null") == 0) ||
 761                     (strcasecmp(new_UUID, "clear") == 0)) {
 762                         uuid_clear(sb->s_uuid);
 763                 } else if (strcasecmp(new_UUID, "time") == 0) {
 764                         uuid_generate_time(sb->s_uuid);
 765                 } else if (strcasecmp(new_UUID, "random") == 0) {
 766                         uuid_generate(sb->s_uuid);
 767                 } else if (uuid_parse(new_UUID, sb->s_uuid)) {
 768                         bb_error_msg_and_die("Invalid UUID format");
 769                 }
 770                 ext2fs_mark_super_dirty(fs);
 771         }
 772
 773         if (l_flag)
 774                 list_super (sb);
 775         return (ext2fs_close (fs) ? 1 : 0);
 776 }