misc/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 <linux/ext2_fs.h>
  45
  46 #include "ext2fs/ext2fs.h"
  47 #include "et/com_err.h"
  48 #include "uuid/uuid.h"
  49 #include "e2p/e2p.h"
  50 #include "jfs_user.h"
  51 #include "util.h"
  52
  53 #include "../version.h"
  54 #include "nls-enable.h"
  55
  56 const char * program_name = "tune2fs";
  57 char * device_name;
  58 char * new_label, *new_last_mounted, *new_UUID;
  59 static int c_flag, C_flag, e_flag, f_flag, g_flag, i_flag, l_flag, L_flag;
  60 static int m_flag, M_flag, r_flag, s_flag = -1, u_flag, U_flag;
  61 static int print_label;
  62 static int max_mount_count, mount_count, mount_flags;
  63 static unsigned long interval, reserved_ratio, reserved_blocks;
  64 static unsigned long resgid, resuid;
  65 static unsigned short errors;
  66 static int open_flag;
  67 static char *features_cmd;
  68
  69 int journal_size, journal_flags;
  70 char *journal_device;
  71
  72 static const char *please_fsck = N_("Please run e2fsck on the filesystem.\n");
  73
  74 static void usage(void)
  75 {
  76         fprintf(stderr,
  77                 _("Usage: %s [-c max-mounts-count] [-e errors-behavior] "
  78                   "[-g group]\n"
  79                  "\t[-i interval[d|m|w]] [-j] [-J journal-options]\n"
  80                  "\t[-l] [-s sparse-flag] [-m reserved-blocks-percent]\n"
  81                   "\t[-r reserved-blocks-count] [-u user] [-C mount-count]\n"
  82                   "\t[-L volume-label] [-M last-mounted-dir] [-U UUID]\n"
  83                   "\t[-O [^]feature[,...]] device\n"), program_name);
  84         exit (1);
  85 }
  86
  87 static __u32 ok_features[3] = {
  88         EXT3_FEATURE_COMPAT_HAS_JOURNAL,        /* Compat */
  89         EXT2_FEATURE_INCOMPAT_FILETYPE,         /* Incompat */
  90         EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     /* R/O compat */
  91 };
  92
  93 /*
  94  * Remove an external journal from the filesystem
  95  */
  96 static void remove_journal_device(ext2_filsys fs)
  97 {
  98         char            *journal_device;
  99         ext2_filsys     jfs;
 100         char            buf[1024];
 101         journal_superblock_t    *jsb;
 102         int             i, nr_users;
 103         errcode_t       retval;
 104         int             commit_remove_journal = 0;
 105
 106         if (f_flag)
 107                 commit_remove_journal = 1; /* force removal even if error */
 108
 109         journal_device = ext2fs_find_block_device(fs->super->s_journal_dev);
 110         if (!journal_device)
 111                 return;
 112
 113         retval = ext2fs_open(journal_device, EXT2_FLAG_RW|
 114                              EXT2_FLAG_JOURNAL_DEV_OK, 0,
 115                              fs->blocksize, unix_io_manager, &jfs);
 116         if (retval) {
 117                 com_err(program_name, retval,
 118                         _("while trying to open external journal"));
 119                 goto no_valid_journal;
 120         }
 121         if (!(jfs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
 122                 fprintf(stderr, "%s is not a journal device.\n",
 123                         journal_device);
 124                 goto no_valid_journal;
 125         }
 126
 127         /* Get the journal superblock */
 128         if ((retval = io_channel_read_blk(jfs->io, 1, -1024, buf))) {
 129                 com_err(program_name, retval,
 130                         _("while reading journal superblock"));
 131                 goto no_valid_journal;
 132         }
 133
 134         jsb = (journal_superblock_t *) buf;
 135         if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) ||
 136             (jsb->s_header.h_blocktype != (unsigned) ntohl(JFS_SUPERBLOCK_V2))) {
 137                 fprintf(stderr, _("Journal superblock not found!\n"));
 138                 goto no_valid_journal;
 139         }
 140
 141         /* Find the filesystem UUID */
 142         nr_users = ntohl(jsb->s_nr_users);
 143         for (i=0; i < nr_users; i++) {
 144                 if (memcmp(fs->super->s_uuid,
 145                            &jsb->s_users[i*16], 16) == 0)
 146                         break;
 147         }
 148         if (i >= nr_users) {
 149                 fprintf(stderr, "Filesystem's UUID not found on journal device.\n");
 150                 commit_remove_journal = 1;
 151                 goto no_valid_journal;
 152         }
 153         nr_users--;
 154         for (i=0; i < nr_users; i++)
 155                 memcpy(&jsb->s_users[i*16], &jsb->s_users[(i+1)*16], 16);
 156         jsb->s_nr_users = htonl(nr_users);
 157
 158         /* Write back the journal superblock */
 159         if ((retval = io_channel_write_blk(jfs->io, 1, -1024, buf))) {
 160                 com_err(program_name, retval,
 161                         "while writing journal superblock.");
 162                 goto no_valid_journal;
 163         }
 164
 165         commit_remove_journal = 1;
 166
 167 no_valid_journal:
 168         if (commit_remove_journal == 0) {
 169                 printf(_("Journal NOT removed\n"));
 170                 exit(1);
 171         }
 172         fs->super->s_journal_dev = 0;
 173         memset(fs->super->s_journal_uuid, 0,
 174                sizeof(fs->super->s_journal_uuid));
 175         ext2fs_mark_super_dirty(fs);
 176         printf(_("Journal removed\n"));
 177 }
 178
 179
 180 /*
 181  * Update the feature set as provided by the user.
 182  */
 183 static void update_feature_set(ext2_filsys fs, char *features)
 184 {
 185         int sparse, old_sparse, filetype, old_filetype;
 186         int journal, old_journal;
 187         struct ext2_inode       inode;
 188         struct ext2_super_block *sb= fs->super;
 189         errcode_t               retval;
 190
 191         old_sparse = sb->s_feature_ro_compat &
 192                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 193         old_filetype = sb->s_feature_incompat &
 194                 EXT2_FEATURE_INCOMPAT_FILETYPE;
 195         old_journal = sb->s_feature_compat &
 196                 EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 197         if (e2p_edit_feature(features, &sb->s_feature_compat,
 198                              ok_features)) {
 199                 fprintf(stderr, _("Invalid filesystem option set: %s\n"),
 200                         features);
 201                 exit(1);
 202         }
 203         sparse = sb->s_feature_ro_compat &
 204                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 205         filetype = sb->s_feature_incompat &
 206                 EXT2_FEATURE_INCOMPAT_FILETYPE;
 207         journal = sb->s_feature_compat &
 208                 EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 209         if (old_journal && !journal) {
 210                 if ((mount_flags & EXT2_MF_MOUNTED) &&
 211                     !(mount_flags & EXT2_MF_READONLY)) {
 212                         fprintf(stderr,
 213                                 _("The HAS_JOURNAL flag may only be "
 214                                   "cleared when the filesystem is\n"
 215                                   "unmounted or mounted "
 216                                   "read-only.\n"));
 217                         exit(1);
 218                 }
 219                 if (sb->s_feature_incompat &
 220                     EXT3_FEATURE_INCOMPAT_RECOVER) {
 221                         fprintf(stderr,
 222                                 _("The NEEDS_RECOVERY flag is set.  "
 223                                   "Please run e2fsck before clearing\n"
 224                                   "the HAS_JOURNAL flag.\n"));
 225                         exit(1);
 226                 }
 227                 /*
 228                  * Remove the immutable flag on the journal inode
 229                  */
 230                 if (sb->s_journal_inum) {
 231                         retval = ext2fs_read_inode(fs, sb->s_journal_inum,
 232                                                    &inode);
 233                         if (retval) {
 234                                 com_err(program_name, retval,
 235                                         "while reading journal inode");
 236                                 exit(1);
 237                         }
 238                         inode.i_flags &= ~EXT2_IMMUTABLE_FL;
 239                         retval = ext2fs_write_inode(fs, sb->s_journal_inum,
 240                                                     &inode);
 241                         if (retval) {
 242                                 com_err(program_name, retval,
 243                                         "while writing journal inode");
 244                                 exit(1);
 245                         }
 246                 }
 247                 if (sb->s_journal_dev)
 248                         remove_journal_device(fs);
 249         }
 250         if (journal && !old_journal) {
 251                 /*
 252                  * If adding a journal flag, let the create journal
 253                  * code below handle creating setting the flag and
 254                  * creating the journal.  We supply a default size if
 255                  * necessary.
 256                  */
 257                 if (!journal_size)
 258                         journal_size = -1;
 259                 sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 260                 journal = old_journal;
 261         }
 262
 263         if (sb->s_rev_level == EXT2_GOOD_OLD_REV &&
 264             (sb->s_feature_compat || sb->s_feature_ro_compat ||
 265              sb->s_feature_incompat))
 266                 ext2fs_update_dynamic_rev(fs);
 267         if ((sparse != old_sparse) ||
 268             (filetype != old_filetype) ||
 269             (journal != old_journal)) {
 270                 sb->s_state &= ~EXT2_VALID_FS;
 271                 printf("\n%s\n", _(please_fsck));
 272         }
 273         ext2fs_mark_super_dirty(fs);
 274 }
 275
 276 /*
 277  * Add a journal to the filesystem.
 278  */
 279 static void add_journal(ext2_filsys fs)
 280 {
 281         unsigned long journal_blocks;
 282         errcode_t       retval;
 283         ext2_filsys     jfs;
 284
 285         if (fs->super->s_feature_compat &
 286             EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
 287                 fprintf(stderr, _("The filesystem already has a journal.\n"));
 288                 exit(1);
 289         }
 290         if (journal_device) {
 291                 check_plausibility(journal_device);
 292                 check_mount(journal_device, 0, _("journal"));
 293                 retval = ext2fs_open(journal_device, EXT2_FLAG_RW|
 294                                      EXT2_FLAG_JOURNAL_DEV_OK, 0,
 295                                      fs->blocksize, unix_io_manager, &jfs);
 296                 if (retval) {
 297                         com_err(program_name, retval,
 298                                 _("\n\twhile trying to open journal on %s\n"),
 299                                 journal_device);
 300                         exit(1);
 301                 }
 302                 printf(_("Creating journal on device %s: "),
 303                        journal_device);
 304                 fflush(stdout);
 305
 306                 retval = ext2fs_add_journal_device(fs, jfs);
 307                 if (retval) {
 308                         com_err (program_name, retval,
 309                                  _("while trying to create journal on device %s"),
 310                                  journal_device);
 311                         exit(1);
 312                 }
 313                 printf(_("done\n"));
 314                 ext2fs_close(jfs);
 315         } else if (journal_size) {
 316                 printf(_("Creating journal inode: "));
 317                 fflush(stdout);
 318                 journal_blocks = figure_journal_size(journal_size, fs);
 319
 320                 retval = ext2fs_add_journal_inode(fs, journal_blocks,
 321                                                   journal_flags);
 322                 if (retval) {
 323                         printf("\n");
 324                         com_err(program_name, retval,
 325                                 _("\n\twhile trying to create journal file"));
 326                         exit(1);
 327                 } else
 328                         printf(_("done\n"));
 329                 /*
 330                  * If the filesystem wasn't mounted, we need to force
 331                  * the block group descriptors out.
 332                  */
 333                 if ((mount_flags & EXT2_MF_MOUNTED) == 0)
 334                         fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
 335         }
 336 }
 337
 338 /*
 339  * Given argv[0], return the program name.
 340  */
 341 static char *get_progname(char *argv_zero)
 342 {
 343         char    *cp;
 344
 345         cp = strrchr(argv_zero, '/');
 346         if (!cp )
 347                 return argv_zero;
 348         else
 349                 return cp+1;
 350 }
 351
 352
 353 static void parse_e2label_options(int argc, char ** argv)
 354 {
 355         if ((argc < 2) || (argc > 3)) {
 356                 fprintf(stderr, _("Usage: e2label device [newlabel]\n"));
 357                 exit(1);
 358         }
 359         device_name = argv[1];
 360         if (argc == 3) {
 361                 open_flag = EXT2_FLAG_RW;
 362                 L_flag = 1;
 363                 new_label = argv[2];
 364         } else
 365                 print_label++;
 366 }
 367
 368
 369 static void parse_tune2fs_options(int argc, char **argv)
 370 {
 371         int c;
 372         char * tmp;
 373         struct group * gr;
 374         struct passwd * pw;
 375
 376         fprintf (stderr, _("tune2fs %s, %s for EXT2 FS %s, %s\n"),
 377                  E2FSPROGS_VERSION, E2FSPROGS_DATE,
 378                  EXT2FS_VERSION, EXT2FS_DATE);
 379         while ((c = getopt (argc, argv, "c:e:fg:i:jlm:r:s:u:C:J:L:M:O:U:")) != EOF)
 380                 switch (c)
 381                 {
 382                         case 'c':
 383                                 max_mount_count = strtol (optarg, &tmp, 0);
 384                                 if (*tmp || max_mount_count > 16000) {
 385                                         com_err (program_name, 0,
 386                                                  _("bad mounts count - %s"),
 387                                                  optarg);
 388                                         usage();
 389                                 }
 390                                 if (max_mount_count == 0)
 391                                         max_mount_count = -1;
 392                                 c_flag = 1;
 393                                 open_flag = EXT2_FLAG_RW;
 394                                 break;
 395                         case 'C':
 396                                 mount_count = strtoul (optarg, &tmp, 0);
 397                                 if (*tmp || mount_count > 16000) {
 398                                         com_err (program_name, 0,
 399                                                  _("bad mounts count - %s"),
 400                                                  optarg);
 401                                         usage();
 402                                 }
 403                                 C_flag = 1;
 404                                 open_flag = EXT2_FLAG_RW;
 405                                 break;
 406                         case 'e':
 407                                 if (strcmp (optarg, "continue") == 0)
 408                                         errors = EXT2_ERRORS_CONTINUE;
 409                                 else if (strcmp (optarg, "remount-ro") == 0)
 410                                         errors = EXT2_ERRORS_RO;
 411                                 else if (strcmp (optarg, "panic") == 0)
 412                                         errors = EXT2_ERRORS_PANIC;
 413                                 else {
 414                                         com_err (program_name, 0,
 415                                                  _("bad error behavior - %s"),
 416                                                  optarg);
 417                                         usage();
 418                                 }
 419                                 e_flag = 1;
 420                                 open_flag = EXT2_FLAG_RW;
 421                                 break;
 422                         case 'f': /* Force */
 423                                 f_flag = 1;
 424                                 break;
 425                         case 'g':
 426                                 resgid = strtoul (optarg, &tmp, 0);
 427                                 if (*tmp) {
 428                                         gr = getgrnam (optarg);
 429                                         if (gr == NULL)
 430                                                 tmp = optarg;
 431                                         else {
 432                                                 resgid = gr->gr_gid;
 433                                                 *tmp =0;
 434                                         }
 435                                 }
 436                                 if (*tmp) {
 437                                         com_err (program_name, 0,
 438                                                  _("bad gid/group name - %s"),
 439                                                  optarg);
 440                                         usage();
 441                                 }
 442                                 g_flag = 1;
 443                                 open_flag = EXT2_FLAG_RW;
 444                                 break;
 445                         case 'i':
 446                                 interval = strtoul (optarg, &tmp, 0);
 447                                 switch (*tmp) {
 448                                 case 's':
 449                                         tmp++;
 450                                         break;
 451                                 case '\0':
 452                                 case 'd':
 453                                 case 'D': /* days */
 454                                         interval *= 86400;
 455                                         if (*tmp != '\0')
 456                                                 tmp++;
 457                                         break;
 458                                 case 'm':
 459                                 case 'M': /* months! */
 460                                         interval *= 86400 * 30;
 461                                         tmp++;
 462                                         break;
 463                                 case 'w':
 464                                 case 'W': /* weeks */
 465                                         interval *= 86400 * 7;
 466                                         tmp++;
 467                                         break;
 468                                 }
 469                                 if (*tmp || interval > (365 * 86400)) {
 470                                         com_err (program_name, 0,
 471                                                 _("bad interval - %s"), optarg);
 472                                         usage();
 473                                 }
 474                                 i_flag = 1;
 475                                 open_flag = EXT2_FLAG_RW;
 476                                 break;
 477                         case 'j':
 478                                 if (!journal_size)
 479                                         journal_size = -1;
 480                                 open_flag = EXT2_FLAG_RW;
 481                                 break;
 482                         case 'J':
 483                                 parse_journal_opts(optarg);
 484                                 open_flag = EXT2_FLAG_RW;
 485                                 break;
 486                         case 'l':
 487                                 l_flag = 1;
 488                                 break;
 489                         case 'L':
 490                                 new_label = optarg;
 491                                 L_flag = 1;
 492                                 open_flag = EXT2_FLAG_RW;
 493                                 break;
 494                         case 'm':
 495                                 reserved_ratio = strtoul (optarg, &tmp, 0);
 496                                 if (*tmp || reserved_ratio > 50) {
 497                                         com_err (program_name, 0,
 498                                                  _("bad reserved block ratio - %s"),
 499                                                  optarg);
 500                                         usage();
 501                                 }
 502                                 m_flag = 1;
 503                                 open_flag = EXT2_FLAG_RW;
 504                                 break;
 505                         case 'M':
 506                                 new_last_mounted = optarg;
 507                                 M_flag = 1;
 508                                 open_flag = EXT2_FLAG_RW;
 509                                 break;
 510                         case 'O':
 511                                 features_cmd = optarg;
 512                                 open_flag = EXT2_FLAG_RW;
 513                                 break;
 514                         case 'r':
 515                                 reserved_blocks = strtoul (optarg, &tmp, 0);
 516                                 if (*tmp) {
 517                                         com_err (program_name, 0,
 518                                                  _("bad reserved blocks count - %s"),
 519                                                  optarg);
 520                                         usage();
 521                                 }
 522                                 r_flag = 1;
 523                                 open_flag = EXT2_FLAG_RW;
 524                                 break;
 525                         case 's':
 526                                 s_flag = atoi(optarg);
 527                                 open_flag = EXT2_FLAG_RW;
 528                                 break;
 529                         case 'u':
 530                                 resuid = strtoul (optarg, &tmp, 0);
 531                                 if (*tmp) {
 532                                         pw = getpwnam (optarg);
 533                                         if (pw == NULL)
 534                                                 tmp = optarg;
 535                                         else {
 536                                                 resuid = pw->pw_uid;
 537                                                 *tmp = 0;
 538                                         }
 539                                 }
 540                                 if (*tmp) {
 541                                         com_err (program_name, 0,
 542                                                  _("bad uid/user name - %s"),
 543                                                  optarg);
 544                                         usage();
 545                                 }
 546                                 u_flag = 1;
 547                                 open_flag = EXT2_FLAG_RW;
 548                                 break;
 549                         case 'U':
 550                                 new_UUID = optarg;
 551                                 U_flag = 1;
 552                                 open_flag = EXT2_FLAG_RW;
 553                                 break;
 554                         default:
 555                                 usage();
 556                 }
 557         if (optind < argc - 1 || optind == argc)
 558                 usage();
 559         if (!open_flag && !l_flag)
 560                 usage();
 561         device_name = argv[optind];
 562 }
 563
 564
 565
 566 int main (int argc, char ** argv)
 567 {
 568         errcode_t retval;
 569         ext2_filsys fs;
 570         struct ext2_super_block *sb;
 571
 572 #ifdef ENABLE_NLS
 573         setlocale(LC_MESSAGES, "");
 574         bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
 575         textdomain(NLS_CAT_NAME);
 576 #endif
 577         if (argc && *argv)
 578                 program_name = *argv;
 579         initialize_ext2_error_table();
 580
 581         if (strcmp(get_progname(argv[0]), "e2label") == 0)
 582                 parse_e2label_options(argc, argv);
 583         else
 584                 parse_tune2fs_options(argc, argv);
 585
 586         retval = ext2fs_open (device_name, open_flag, 0, 0,
 587                               unix_io_manager, &fs);
 588         if (retval) {
 589                 com_err (program_name, retval, _("while trying to open %s"),
 590                          device_name);
 591                 printf(_("Couldn't find valid filesystem superblock.\n"));
 592                 exit(1);
 593         }
 594         sb = fs->super;
 595         if (print_label) {
 596                 /* For e2label emulation */
 597                 printf("%.*s\n", (int) sizeof(sb->s_volume_name),
 598                        sb->s_volume_name);
 599                 exit(0);
 600         }
 601         retval = ext2fs_check_if_mounted(device_name, &mount_flags);
 602         if (retval) {
 603                 com_err("ext2fs_check_if_mount", retval,
 604                         _("while determining whether %s is mounted."),
 605                         device_name);
 606                 exit(1);
 607         }
 608         /* Normally we only need to write out the superblock */
 609         fs->flags |= EXT2_FLAG_SUPER_ONLY;
 610
 611         if (c_flag) {
 612                 sb->s_max_mnt_count = max_mount_count;
 613                 ext2fs_mark_super_dirty(fs);
 614                 printf (_("Setting maximal mount count to %d\n"),
 615                         max_mount_count);
 616         }
 617         if (C_flag) {
 618                 sb->s_mnt_count = mount_count;
 619                 ext2fs_mark_super_dirty(fs);
 620                 printf (_("Setting current mount count to %d\n"), mount_count);
 621         }
 622         if (e_flag) {
 623                 sb->s_errors = errors;
 624                 ext2fs_mark_super_dirty(fs);
 625                 printf (_("Setting error behavior to %d\n"), errors);
 626         }
 627         if (g_flag) {
 628                 sb->s_def_resgid = resgid;
 629                 ext2fs_mark_super_dirty(fs);
 630                 printf (_("Setting reserved blocks gid to %lu\n"), resgid);
 631         }
 632         if (i_flag) {
 633                 sb->s_checkinterval = interval;
 634                 ext2fs_mark_super_dirty(fs);
 635                 printf (_("Setting interval between check %lu seconds\n"), interval);
 636         }
 637         if (m_flag) {
 638                 sb->s_r_blocks_count = (sb->s_blocks_count / 100)
 639                         * reserved_ratio;
 640                 ext2fs_mark_super_dirty(fs);
 641                 printf (_("Setting reserved blocks percentage to %lu (%u blocks)\n"),
 642                         reserved_ratio, sb->s_r_blocks_count);
 643         }
 644         if (r_flag) {
 645                 if (reserved_blocks >= sb->s_blocks_count) {
 646                         com_err (program_name, 0,
 647                                  _("reserved blocks count is too big (%ul)"),
 648                                  reserved_blocks);
 649                         exit (1);
 650                 }
 651                 sb->s_r_blocks_count = reserved_blocks;
 652                 ext2fs_mark_super_dirty(fs);
 653                 printf (_("Setting reserved blocks count to %lu\n"),
 654                         reserved_blocks);
 655         }
 656         if (s_flag == 1) {
 657                 if (sb->s_feature_ro_compat &
 658                     EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)
 659                         fprintf(stderr, _("\nThe filesystem already"
 660                                 " has sparse superblocks.\n"));
 661                 else {
 662                         sb->s_feature_ro_compat |=
 663                                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 664                         sb->s_state &= ~EXT2_VALID_FS;
 665                         ext2fs_mark_super_dirty(fs);
 666                         printf(_("\nSparse superblock flag set.  %s"),
 667                                _(please_fsck));
 668                 }
 669         }
 670         if (s_flag == 0) {
 671                 if (!(sb->s_feature_ro_compat &
 672                       EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER))
 673                         fprintf(stderr, _("\nThe filesystem already"
 674                                 " has sparse superblocks disabled.\n"));
 675                 else {
 676                         sb->s_feature_ro_compat &=
 677                                 ~EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 678                         sb->s_state &= ~EXT2_VALID_FS;
 679                         fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
 680                         ext2fs_mark_super_dirty(fs);
 681                         printf(_("\nSparse superblock flag cleared.  %s"),
 682                                _(please_fsck));
 683                 }
 684         }
 685         if (u_flag) {
 686                 sb->s_def_resuid = resuid;
 687                 ext2fs_mark_super_dirty(fs);
 688                 printf (_("Setting reserved blocks uid to %lu\n"), resuid);
 689         }
 690         if (L_flag) {
 691                 if (strlen(new_label) > sizeof(sb->s_volume_name))
 692                         fprintf(stderr, _("Warning: label too "
 693                                 "long, truncating.\n"));
 694                 memset(sb->s_volume_name, 0, sizeof(sb->s_volume_name));
 695                 strncpy(sb->s_volume_name, new_label,
 696                         sizeof(sb->s_volume_name));
 697                 ext2fs_mark_super_dirty(fs);
 698         }
 699         if (M_flag) {
 700                 memset(sb->s_last_mounted, 0, sizeof(sb->s_last_mounted));
 701                 strncpy(sb->s_last_mounted, new_last_mounted,
 702                         sizeof(sb->s_last_mounted));
 703                 ext2fs_mark_super_dirty(fs);
 704         }
 705         if (features_cmd)
 706                 update_feature_set(fs, features_cmd);
 707         if (journal_size || journal_device)
 708                 add_journal(fs);
 709
 710         if (U_flag) {
 711                 if ((strcasecmp(new_UUID, "null") == 0) ||
 712                     (strcasecmp(new_UUID, "clear") == 0)) {
 713                         uuid_clear(sb->s_uuid);
 714                 } else if (strcasecmp(new_UUID, "time") == 0) {
 715                         uuid_generate_time(sb->s_uuid);
 716                 } else if (strcasecmp(new_UUID, "random") == 0) {
 717                         uuid_generate(sb->s_uuid);
 718                 } else if (uuid_parse(new_UUID, sb->s_uuid)) {
 719                         com_err(program_name, 0, _("Invalid UUID format\n"));
 720                         exit(1);
 721                 }
 722                 ext2fs_mark_super_dirty(fs);
 723         }
 724
 725         if (l_flag)
 726                 list_super (sb);
 727         ext2fs_close (fs);
 728         exit (0);
 729 }