e2fsprogs/old_e2fsprogs/tune2fs.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * tune2fs.c - Change the file system parameters on an ext2 file system
   4  *
   5  * Copyright (C) 1992, 1993, 1994  Remy Card <card@masi.ibp.fr>
   6  *                                 Laboratoire MASI, Institut Blaise Pascal
   7  *                                 Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  * Copyright 1995, 1996, 1997, 1998, 1999, 2000 by Theodore Ts'o.
  10  *
  11  * Licensed under GPLv2, see file LICENSE in this tarball for details.
  12  */
  13
  14 /*
  15  * History:
  16  * 93/06/01     - Creation
  17  * 93/10/31     - Added the -c option to change the maximal mount counts
  18  * 93/12/14     - Added -l flag to list contents of superblock
  19  *                M.J.E. Mol (marcel@duteca.et.tudelft.nl)
  20  *                F.W. ten Wolde (franky@duteca.et.tudelft.nl)
  21  * 93/12/29     - Added the -e option to change errors behavior
  22  * 94/02/27     - Ported to use the ext2fs library
  23  * 94/03/06     - Added the checks interval from Uwe Ohse (uwe@tirka.gun.de)
  24  */
  25
  26 #include <sys/types.h>
  27 #include <fcntl.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <time.h>
  32 #include <unistd.h>
  33 #include <getopt.h>
  34
  35 #include "e2fsbb.h"
  36 #include "ext2fs/ext2_fs.h"
  37 #include "ext2fs/ext2fs.h"
  38 #include "uuid/uuid.h"
  39 #include "e2p/e2p.h"
  40 #include "ext2fs/kernel-jbd.h"
  41 #include "util.h"
  42 #include "blkid/blkid.h"
  43
  44 #include "libbb.h"
  45
  46 static char * device_name = NULL;
  47 static char * new_label, *new_last_mounted, *new_UUID;
  48 static char * io_options;
  49 static int c_flag, C_flag, e_flag, f_flag, g_flag, i_flag, l_flag, L_flag;
  50 static int m_flag, M_flag, r_flag, s_flag = -1, u_flag, U_flag, T_flag;
  51 static time_t last_check_time;
  52 static int print_label;
  53 static int max_mount_count, mount_count, mount_flags;
  54 static unsigned long interval, reserved_blocks;
  55 static unsigned reserved_ratio;
  56 static unsigned long resgid, resuid;
  57 static unsigned short errors;
  58 static int open_flag;
  59 static char *features_cmd;
  60 static char *mntopts_cmd;
  61
  62 static int journal_size, journal_flags;
  63 static char *journal_device = NULL;
  64
  65 static const char *please_fsck = "Please run e2fsck on the filesystem\n";
  66
  67 static __u32 ok_features[3] = {
  68         EXT3_FEATURE_COMPAT_HAS_JOURNAL | EXT2_FEATURE_COMPAT_DIR_INDEX,
  69         EXT2_FEATURE_INCOMPAT_FILETYPE,
  70         EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER
  71 };
  72
  73 /*
  74  * Remove an external journal from the filesystem
  75  */
  76 static void remove_journal_device(ext2_filsys fs)
  77 {
  78         char            *journal_path;
  79         ext2_filsys     jfs;
  80         char            buf[1024];
  81         journal_superblock_t    *jsb;
  82         int             i, nr_users;
  83         errcode_t       retval;
  84         int             commit_remove_journal = 0;
  85         io_manager      io_ptr;
  86
  87         if (f_flag)
  88                 commit_remove_journal = 1; /* force removal even if error */
  89
  90         uuid_unparse(fs->super->s_journal_uuid, buf);
  91         journal_path = blkid_get_devname(NULL, "UUID", buf);
  92
  93         if (!journal_path) {
  94                 journal_path =
  95                         ext2fs_find_block_device(fs->super->s_journal_dev);
  96                 if (!journal_path)
  97                         return;
  98         }
  99
 100         io_ptr = unix_io_manager;
 101         retval = ext2fs_open(journal_path, EXT2_FLAG_RW|
 102                              EXT2_FLAG_JOURNAL_DEV_OK, 0,
 103                              fs->blocksize, io_ptr, &jfs);
 104         if (retval) {
 105                 bb_error_msg("Failed to open external journal");
 106                 goto no_valid_journal;
 107         }
 108         if (!(jfs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
 109                 bb_error_msg("%s is not a journal device", journal_path);
 110                 goto no_valid_journal;
 111         }
 112
 113         /* Get the journal superblock */
 114         if ((retval = io_channel_read_blk(jfs->io, 1, -1024, buf))) {
 115                 bb_error_msg("Failed to read journal superblock");
 116                 goto no_valid_journal;
 117         }
 118
 119         jsb = (journal_superblock_t *) buf;
 120         if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) ||
 121             (jsb->s_header.h_blocktype != (unsigned) ntohl(JFS_SUPERBLOCK_V2))) {
 122                 bb_error_msg("Journal superblock not found!");
 123                 goto no_valid_journal;
 124         }
 125
 126         /* Find the filesystem UUID */
 127         nr_users = ntohl(jsb->s_nr_users);
 128         for (i=0; i < nr_users; i++) {
 129                 if (memcmp(fs->super->s_uuid,
 130                            &jsb->s_users[i*16], 16) == 0)
 131                         break;
 132         }
 133         if (i >= nr_users) {
 134                 bb_error_msg("Filesystem's UUID not found on journal device");
 135                 commit_remove_journal = 1;
 136                 goto no_valid_journal;
 137         }
 138         nr_users--;
 139         for (i=0; i < nr_users; i++)
 140                 memcpy(&jsb->s_users[i*16], &jsb->s_users[(i+1)*16], 16);
 141         jsb->s_nr_users = htonl(nr_users);
 142
 143         /* Write back the journal superblock */
 144         if ((retval = io_channel_write_blk(jfs->io, 1, -1024, buf))) {
 145                 bb_error_msg("Failed to write journal superblock");
 146                 goto no_valid_journal;
 147         }
 148
 149         commit_remove_journal = 1;
 150
 151 no_valid_journal:
 152         if (commit_remove_journal == 0)
 153                 bb_error_msg_and_die("Journal NOT removed");
 154         fs->super->s_journal_dev = 0;
 155         uuid_clear(fs->super->s_journal_uuid);
 156         ext2fs_mark_super_dirty(fs);
 157         puts("Journal removed");
 158         free(journal_path);
 159 }
 160
 161 /* Helper function for remove_journal_inode */
 162 static int release_blocks_proc(ext2_filsys fs, blk_t *blocknr,
 163                                int blockcnt EXT2FS_ATTR((unused)),
 164                                void *private EXT2FS_ATTR((unused)))
 165 {
 166         blk_t   block;
 167         int     group;
 168
 169         block = *blocknr;
 170         ext2fs_unmark_block_bitmap(fs->block_map,block);
 171         group = ext2fs_group_of_blk(fs, block);
 172         fs->group_desc[group].bg_free_blocks_count++;
 173         fs->super->s_free_blocks_count++;
 174         return 0;
 175 }
 176
 177 /*
 178  * Remove the journal inode from the filesystem
 179  */
 180 static void remove_journal_inode(ext2_filsys fs)
 181 {
 182         struct ext2_inode       inode;
 183         errcode_t               retval;
 184         ino_t                   ino = fs->super->s_journal_inum;
 185         char *msg = "to read";
 186         char *s = "journal inode";
 187
 188         retval = ext2fs_read_inode(fs, ino,  &inode);
 189         if (retval)
 190                 goto REMOVE_JOURNAL_INODE_ERROR;
 191         if (ino == EXT2_JOURNAL_INO) {
 192                 retval = ext2fs_read_bitmaps(fs);
 193                 if (retval) {
 194                         msg = "to read bitmaps";
 195                         s = "";
 196                         goto REMOVE_JOURNAL_INODE_ERROR;
 197                 }
 198                 retval = ext2fs_block_iterate(fs, ino, 0, NULL,
 199                                               release_blocks_proc, NULL);
 200                 if (retval) {
 201                         msg = "clearing";
 202                         goto REMOVE_JOURNAL_INODE_ERROR;
 203                 }
 204                 memset(&inode, 0, sizeof(inode));
 205                 ext2fs_mark_bb_dirty(fs);
 206                 fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
 207         } else
 208                 inode.i_flags &= ~EXT2_IMMUTABLE_FL;
 209         retval = ext2fs_write_inode(fs, ino, &inode);
 210         if (retval) {
 211                 msg = "writing";
 212 REMOVE_JOURNAL_INODE_ERROR:
 213                 bb_error_msg_and_die("Failed %s %s", msg, s);
 214         }
 215         fs->super->s_journal_inum = 0;
 216         ext2fs_mark_super_dirty(fs);
 217 }
 218
 219 /*
 220  * Update the default mount options
 221  */
 222 static void update_mntopts(ext2_filsys fs, char *mntopts)
 223 {
 224         struct ext2_super_block *sb= fs->super;
 225
 226         if (e2p_edit_mntopts(mntopts, &sb->s_default_mount_opts, ~0))
 227                 bb_error_msg_and_die("Invalid mount option set: %s", mntopts);
 228         ext2fs_mark_super_dirty(fs);
 229 }
 230
 231 /*
 232  * Update the feature set as provided by the user.
 233  */
 234 static void update_feature_set(ext2_filsys fs, char *features)
 235 {
 236         int sparse, old_sparse, filetype, old_filetype;
 237         int journal, old_journal, dxdir, old_dxdir;
 238         struct ext2_super_block *sb= fs->super;
 239         __u32   old_compat, old_incompat, old_ro_compat;
 240
 241         old_compat = sb->s_feature_compat;
 242         old_ro_compat = sb->s_feature_ro_compat;
 243         old_incompat = sb->s_feature_incompat;
 244
 245         old_sparse = sb->s_feature_ro_compat &
 246                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 247         old_filetype = sb->s_feature_incompat &
 248                 EXT2_FEATURE_INCOMPAT_FILETYPE;
 249         old_journal = sb->s_feature_compat &
 250                 EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 251         old_dxdir = sb->s_feature_compat &
 252                 EXT2_FEATURE_COMPAT_DIR_INDEX;
 253         if (e2p_edit_feature(features, &sb->s_feature_compat, ok_features))
 254                 bb_error_msg_and_die("Invalid filesystem option set: %s", features);
 255         sparse = sb->s_feature_ro_compat &
 256                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 257         filetype = sb->s_feature_incompat &
 258                 EXT2_FEATURE_INCOMPAT_FILETYPE;
 259         journal = sb->s_feature_compat &
 260                 EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 261         dxdir = sb->s_feature_compat &
 262                 EXT2_FEATURE_COMPAT_DIR_INDEX;
 263         if (old_journal && !journal) {
 264                 if ((mount_flags & EXT2_MF_MOUNTED) &&
 265                     !(mount_flags & EXT2_MF_READONLY)) {
 266                         bb_error_msg_and_die(
 267                                 "The has_journal flag may only be "
 268                                 "cleared when the filesystem is\n"
 269                                 "unmounted or mounted "
 270                                 "read-only");
 271                 }
 272                 if (sb->s_feature_incompat &
 273                     EXT3_FEATURE_INCOMPAT_RECOVER) {
 274                         bb_error_msg_and_die(
 275                                 "The needs_recovery flag is set.  "
 276                                 "%s before clearing the has_journal flag.",
 277                                 please_fsck);
 278                 }
 279                 if (sb->s_journal_inum) {
 280                         remove_journal_inode(fs);
 281                 }
 282                 if (sb->s_journal_dev) {
 283                         remove_journal_device(fs);
 284                 }
 285         }
 286         if (journal && !old_journal) {
 287                 /*
 288                  * If adding a journal flag, let the create journal
 289                  * code below handle creating setting the flag and
 290                  * creating the journal.  We supply a default size if
 291                  * necessary.
 292                  */
 293                 if (!journal_size)
 294                         journal_size = -1;
 295                 sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 296         }
 297         if (dxdir && !old_dxdir) {
 298                 if (!sb->s_def_hash_version)
 299                         sb->s_def_hash_version = EXT2_HASH_TEA;
 300                 if (uuid_is_null((unsigned char *) sb->s_hash_seed))
 301                         uuid_generate((unsigned char *) sb->s_hash_seed);
 302         }
 303
 304         if (sb->s_rev_level == EXT2_GOOD_OLD_REV &&
 305             (sb->s_feature_compat || sb->s_feature_ro_compat ||
 306              sb->s_feature_incompat))
 307                 ext2fs_update_dynamic_rev(fs);
 308         if ((sparse != old_sparse) ||
 309             (filetype != old_filetype)) {
 310                 sb->s_state &= ~EXT2_VALID_FS;
 311                 printf("\n%s\n", please_fsck);
 312         }
 313         if ((old_compat != sb->s_feature_compat) ||
 314             (old_ro_compat != sb->s_feature_ro_compat) ||
 315             (old_incompat != sb->s_feature_incompat))
 316                 ext2fs_mark_super_dirty(fs);
 317 }
 318
 319 /*
 320  * Add a journal to the filesystem.
 321  */
 322 static void add_journal(ext2_filsys fs)
 323 {
 324         if (fs->super->s_feature_compat &
 325             EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
 326                 bb_error_msg_and_die("The filesystem already has a journal");
 327         }
 328         if (journal_device) {
 329                 make_journal_device(journal_device, fs, 0, 0);
 330         } else if (journal_size) {
 331                 make_journal_blocks(fs, journal_size, journal_flags, 0);
 332                 /*
 333                  * If the filesystem wasn't mounted, we need to force
 334                  * the block group descriptors out.
 335                  */
 336                 if ((mount_flags & EXT2_MF_MOUNTED) == 0)
 337                         fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
 338         }
 339         print_check_message(fs);
 340 }
 341
 342 /*
 343  * Busybox stuff
 344  */
 345 static char * x_blkid_get_devname(const char *token)
 346 {
 347         char * dev_name;
 348
 349         if (!(dev_name = blkid_get_devname(NULL, token, NULL)))
 350                 bb_error_msg_and_die("Unable to resolve '%s'", token);
 351         return dev_name;
 352 }
 353
 354 #ifdef CONFIG_E2LABEL
 355 static void parse_e2label_options(int argc, char ** argv)
 356 {
 357         if ((argc < 2) || (argc > 3))
 358                 bb_show_usage();
 359         io_options = strchr(argv[1], '?');
 360         if (io_options)
 361                 *io_options++ = 0;
 362         device_name = x_blkid_get_devname(argv[1]);
 363         if (argc == 3) {
 364                 open_flag = EXT2_FLAG_RW | EXT2_FLAG_JOURNAL_DEV_OK;
 365                 L_flag = 1;
 366                 new_label = argv[2];
 367         } else
 368                 print_label++;
 369 }
 370 #else
 371 #define parse_e2label_options(x,y)
 372 #endif
 373
 374 static time_t parse_time(char *str)
 375 {
 376         struct  tm      ts;
 377
 378         if (strcmp(str, "now") == 0) {
 379                 return time(0);
 380         }
 381         memset(&ts, 0, sizeof(ts));
 382 #ifdef HAVE_STRPTIME
 383         strptime(str, "%Y%m%d%H%M%S", &ts);
 384 #else
 385         sscanf(str, "%4d%2d%2d%2d%2d%2d", &ts.tm_year, &ts.tm_mon,
 386                &ts.tm_mday, &ts.tm_hour, &ts.tm_min, &ts.tm_sec);
 387         ts.tm_year -= 1900;
 388         ts.tm_mon -= 1;
 389         if (ts.tm_year < 0 || ts.tm_mon < 0 || ts.tm_mon > 11 ||
 390             ts.tm_mday < 0 || ts.tm_mday > 31 || ts.tm_hour > 23 ||
 391             ts.tm_min > 59 || ts.tm_sec > 61)
 392                 ts.tm_mday = 0;
 393 #endif
 394         if (ts.tm_mday == 0) {
 395                 bb_error_msg_and_die("can't parse date/time specifier: %s", str);
 396         }
 397         return mktime(&ts);
 398 }
 399
 400 static void parse_tune2fs_options(int argc, char **argv)
 401 {
 402         int c;
 403         char * tmp;
 404
 405         printf("tune2fs %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
 406         while ((c = getopt(argc, argv, "c:e:fg:i:jlm:o:r:s:u:C:J:L:M:O:T:U:")) != EOF)
 407                 switch (c)
 408                 {
 409                         case 'c':
 410                                 max_mount_count = xatou_range(optarg, 0, 16000);
 411                                 if (max_mount_count == 0)
 412                                         max_mount_count = -1;
 413                                 c_flag = 1;
 414                                 open_flag = EXT2_FLAG_RW;
 415                                 break;
 416                         case 'C':
 417                                 mount_count = xatou_range(optarg, 0, 16000);
 418                                 C_flag = 1;
 419                                 open_flag = EXT2_FLAG_RW;
 420                                 break;
 421                         case 'e':
 422                                 if (strcmp (optarg, "continue") == 0)
 423                                         errors = EXT2_ERRORS_CONTINUE;
 424                                 else if (strcmp (optarg, "remount-ro") == 0)
 425                                         errors = EXT2_ERRORS_RO;
 426                                 else if (strcmp (optarg, "panic") == 0)
 427                                         errors = EXT2_ERRORS_PANIC;
 428                                 else {
 429                                         bb_error_msg_and_die("bad error behavior - %s", optarg);
 430                                 }
 431                                 e_flag = 1;
 432                                 open_flag = EXT2_FLAG_RW;
 433                                 break;
 434                         case 'f': /* Force */
 435                                 f_flag = 1;
 436                                 break;
 437                         case 'g':
 438                                 resgid = bb_strtoul(optarg, NULL, 10);
 439                                 if (errno)
 440                                         resgid = xgroup2gid(optarg);
 441                                 g_flag = 1;
 442                                 open_flag = EXT2_FLAG_RW;
 443                                 break;
 444                         case 'i':
 445                                 interval = strtoul(optarg, &tmp, 0);
 446                                 switch (*tmp) {
 447                                 case 's':
 448                                         tmp++;
 449                                         break;
 450                                 case '\0':
 451                                 case 'd':
 452                                 case 'D': /* days */
 453                                         interval *= 86400;
 454                                         if (*tmp != '\0')
 455                                                 tmp++;
 456                                         break;
 457                                 case 'm':
 458                                 case 'M': /* months! */
 459                                         interval *= 86400 * 30;
 460                                         tmp++;
 461                                         break;
 462                                 case 'w':
 463                                 case 'W': /* weeks */
 464                                         interval *= 86400 * 7;
 465                                         tmp++;
 466                                         break;
 467                                 }
 468                                 if (*tmp || interval > (365 * 86400)) {
 469                                         bb_error_msg_and_die("bad interval - %s", optarg);
 470                                 }
 471                                 i_flag = 1;
 472                                 open_flag = EXT2_FLAG_RW;
 473                                 break;
 474                         case 'j':
 475                                 if (!journal_size)
 476                                         journal_size = -1;
 477                                 open_flag = EXT2_FLAG_RW;
 478                                 break;
 479                         case 'J':
 480                                 parse_journal_opts(&journal_device, &journal_flags, &journal_size, optarg);
 481                                 open_flag = EXT2_FLAG_RW;
 482                                 break;
 483                         case 'l':
 484                                 l_flag = 1;
 485                                 break;
 486                         case 'L':
 487                                 new_label = optarg;
 488                                 L_flag = 1;
 489                                 open_flag = EXT2_FLAG_RW |
 490                                         EXT2_FLAG_JOURNAL_DEV_OK;
 491                                 break;
 492                         case 'm':
 493                                 reserved_ratio = xatou_range(optarg, 0, 50);
 494                                 m_flag = 1;
 495                                 open_flag = EXT2_FLAG_RW;
 496                                 break;
 497                         case 'M':
 498                                 new_last_mounted = optarg;
 499                                 M_flag = 1;
 500                                 open_flag = EXT2_FLAG_RW;
 501                                 break;
 502                         case 'o':
 503                                 if (mntopts_cmd) {
 504                                         bb_error_msg_and_die("-o may only be specified once");
 505                                 }
 506                                 mntopts_cmd = optarg;
 507                                 open_flag = EXT2_FLAG_RW;
 508                                 break;
 509
 510                         case 'O':
 511                                 if (features_cmd) {
 512                                         bb_error_msg_and_die("-O may only be specified once");
 513                                 }
 514                                 features_cmd = optarg;
 515                                 open_flag = EXT2_FLAG_RW;
 516                                 break;
 517                         case 'r':
 518                                 reserved_blocks = xatoul(optarg);
 519                                 r_flag = 1;
 520                                 open_flag = EXT2_FLAG_RW;
 521                                 break;
 522                         case 's':
 523                                 s_flag = atoi(optarg);
 524                                 open_flag = EXT2_FLAG_RW;
 525                                 break;
 526                         case 'T':
 527                                 T_flag = 1;
 528                                 last_check_time = parse_time(optarg);
 529                                 open_flag = EXT2_FLAG_RW;
 530                                 break;
 531                         case 'u':
 532                                 resuid = bb_strtoul(optarg, NULL, 10);
 533                                 if (errno)
 534                                         resuid = xuname2uid(optarg);
 535                                 u_flag = 1;
 536                                 open_flag = EXT2_FLAG_RW;
 537                                 break;
 538                         case 'U':
 539                                 new_UUID = optarg;
 540                                 U_flag = 1;
 541                                 open_flag = EXT2_FLAG_RW |
 542                                         EXT2_FLAG_JOURNAL_DEV_OK;
 543                                 break;
 544                         default:
 545                                 bb_show_usage();
 546                 }
 547         if (optind < argc - 1 || optind == argc)
 548                 bb_show_usage();
 549         if (!open_flag && !l_flag)
 550                 bb_show_usage();
 551         io_options = strchr(argv[optind], '?');
 552         if (io_options)
 553                 *io_options++ = 0;
 554         device_name = x_blkid_get_devname(argv[optind]);
 555 }
 556
 557 static void tune2fs_clean_up(void)
 558 {
 559         if (ENABLE_FEATURE_CLEAN_UP && device_name) free(device_name);
 560         if (ENABLE_FEATURE_CLEAN_UP && journal_device) free(journal_device);
 561 }
 562
 563 int tune2fs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 564 int tune2fs_main(int argc, char **argv)
 565 {
 566         errcode_t retval;
 567         ext2_filsys fs;
 568         struct ext2_super_block *sb;
 569         io_manager io_ptr;
 570
 571         if (ENABLE_FEATURE_CLEAN_UP)
 572                 atexit(tune2fs_clean_up);
 573
 574         if (ENABLE_E2LABEL && (applet_name[0] == 'e')) /* e2label */
 575                 parse_e2label_options(argc, argv);
 576         else
 577                 parse_tune2fs_options(argc, argv);  /* tune2fs */
 578
 579         io_ptr = unix_io_manager;
 580         retval = ext2fs_open2(device_name, io_options, open_flag,
 581                               0, 0, io_ptr, &fs);
 582         if (retval)
 583                 bb_error_msg_and_die("No valid superblock on %s", device_name);
 584         sb = fs->super;
 585         if (print_label) {
 586                 /* For e2label emulation */
 587                 printf("%.*s\n", (int) sizeof(sb->s_volume_name),
 588                        sb->s_volume_name);
 589                 return 0;
 590         }
 591         retval = ext2fs_check_if_mounted(device_name, &mount_flags);
 592         if (retval)
 593                 bb_error_msg_and_die("can't determine if %s is mounted", device_name);
 594         /* Normally we only need to write out the superblock */
 595         fs->flags |= EXT2_FLAG_SUPER_ONLY;
 596
 597         if (c_flag) {
 598                 sb->s_max_mnt_count = max_mount_count;
 599                 ext2fs_mark_super_dirty(fs);
 600                 printf("Setting maximal mount count to %d\n", max_mount_count);
 601         }
 602         if (C_flag) {
 603                 sb->s_mnt_count = mount_count;
 604                 ext2fs_mark_super_dirty(fs);
 605                 printf("Setting current mount count to %d\n", mount_count);
 606         }
 607         if (e_flag) {
 608                 sb->s_errors = errors;
 609                 ext2fs_mark_super_dirty(fs);
 610                 printf("Setting error behavior to %d\n", errors);
 611         }
 612         if (g_flag) {
 613                 sb->s_def_resgid = resgid;
 614                 ext2fs_mark_super_dirty(fs);
 615                 printf("Setting reserved blocks gid to %lu\n", resgid);
 616         }
 617         if (i_flag) {
 618                 sb->s_checkinterval = interval;
 619                 ext2fs_mark_super_dirty(fs);
 620                 printf("Setting interval between check %lu seconds\n", interval);
 621         }
 622         if (m_flag) {
 623                 sb->s_r_blocks_count = (sb->s_blocks_count / 100)
 624                                 * reserved_ratio;
 625                 ext2fs_mark_super_dirty(fs);
 626                 printf("Setting reserved blocks percentage to %u (%u blocks)\n",
 627                         reserved_ratio, sb->s_r_blocks_count);
 628         }
 629         if (r_flag) {
 630                 if (reserved_blocks >= sb->s_blocks_count/2)
 631                         bb_error_msg_and_die("reserved blocks count is too big (%lu)", reserved_blocks);
 632                 sb->s_r_blocks_count = reserved_blocks;
 633                 ext2fs_mark_super_dirty(fs);
 634                 printf("Setting reserved blocks count to %lu\n", reserved_blocks);
 635         }
 636         if (s_flag == 1) {
 637                 if (sb->s_feature_ro_compat &
 638                     EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)
 639                         bb_error_msg("\nThe filesystem already has sparse superblocks");
 640                 else {
 641                         sb->s_feature_ro_compat |=
 642                                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 643                         sb->s_state &= ~EXT2_VALID_FS;
 644                         ext2fs_mark_super_dirty(fs);
 645                         printf("\nSparse superblock flag set.  %s", please_fsck);
 646                 }
 647         }
 648         if (s_flag == 0) {
 649                 if (!(sb->s_feature_ro_compat &
 650                       EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER))
 651                         bb_error_msg("\nThe filesystem already has sparse superblocks disabled");
 652                 else {
 653                         sb->s_feature_ro_compat &=
 654                                 ~EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 655                         sb->s_state &= ~EXT2_VALID_FS;
 656                         fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
 657                         ext2fs_mark_super_dirty(fs);
 658                         printf("\nSparse superblock flag cleared.  %s", please_fsck);
 659                 }
 660         }
 661         if (T_flag) {
 662                 sb->s_lastcheck = last_check_time;
 663                 ext2fs_mark_super_dirty(fs);
 664                 printf("Setting time filesystem last checked to %s\n",
 665                        ctime(&last_check_time));
 666         }
 667         if (u_flag) {
 668                 sb->s_def_resuid = resuid;
 669                 ext2fs_mark_super_dirty(fs);
 670                 printf("Setting reserved blocks uid to %lu\n", resuid);
 671         }
 672         if (L_flag) {
 673                 if (strlen(new_label) > sizeof(sb->s_volume_name))
 674                         bb_error_msg("Warning: label too long, truncating");
 675                 memset(sb->s_volume_name, 0, sizeof(sb->s_volume_name));
 676                 safe_strncpy(sb->s_volume_name, new_label,
 677                         sizeof(sb->s_volume_name));
 678                 ext2fs_mark_super_dirty(fs);
 679         }
 680         if (M_flag) {
 681                 memset(sb->s_last_mounted, 0, sizeof(sb->s_last_mounted));
 682                 safe_strncpy(sb->s_last_mounted, new_last_mounted,
 683                         sizeof(sb->s_last_mounted));
 684                 ext2fs_mark_super_dirty(fs);
 685         }
 686         if (mntopts_cmd)
 687                 update_mntopts(fs, mntopts_cmd);
 688         if (features_cmd)
 689                 update_feature_set(fs, features_cmd);
 690         if (journal_size || journal_device)
 691                 add_journal(fs);
 692
 693         if (U_flag) {
 694                 if ((strcasecmp(new_UUID, "null") == 0) ||
 695                     (strcasecmp(new_UUID, "clear") == 0)) {
 696                         uuid_clear(sb->s_uuid);
 697                 } else if (strcasecmp(new_UUID, "time") == 0) {
 698                         uuid_generate_time(sb->s_uuid);
 699                 } else if (strcasecmp(new_UUID, "random") == 0) {
 700                         uuid_generate(sb->s_uuid);
 701                 } else if (uuid_parse(new_UUID, sb->s_uuid)) {
 702                         bb_error_msg_and_die("Invalid UUID format");
 703                 }
 704                 ext2fs_mark_super_dirty(fs);
 705         }
 706
 707         if (l_flag)
 708                 list_super (sb);
 709         return (ext2fs_close (fs) ? 1 : 0);
 710 }