misc/tune2fs.c

   1 /*
   2  * tune2fs.c            - Change the file system parameters on
   3  *                        an unmounted second extended 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 by Theodore Ts'o.
  10  *
  11  * %Begin-Header%
  12  * This file may be redistributed under the terms of the GNU Public
  13  * License.
  14  * %End-Header%
  15  */
  16
  17 /*
  18  * History:
  19  * 93/06/01     - Creation
  20  * 93/10/31     - Added the -c option to change the maximal mount counts
  21  * 93/12/14     - Added -l flag to list contents of superblock
  22  *                M.J.E. Mol (marcel@duteca.et.tudelft.nl)
  23  *                F.W. ten Wolde (franky@duteca.et.tudelft.nl)
  24  * 93/12/29     - Added the -e option to change errors behavior
  25  * 94/02/27     - Ported to use the ext2fs library
  26  * 94/03/06     - Added the checks interval from Uwe Ohse (uwe@tirka.gun.de)
  27  */
  28
  29 #include <fcntl.h>
  30 #include <grp.h>
  31 #ifdef HAVE_GETOPT_H
  32 #include <getopt.h>
  33 #else
  34 extern char *optarg;
  35 extern int optind;
  36 #endif
  37 #include <pwd.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <time.h>
  42 #include <unistd.h>
  43 #include <sys/types.h>
  44
  45 #include <linux/ext2_fs.h>
  46
  47 #include "ext2fs/ext2fs.h"
  48 #include "et/com_err.h"
  49 #include "uuid/uuid.h"
  50 #include "e2p/e2p.h"
  51 #include "jfs_user.h"
  52 #include "util.h"
  53
  54 #include "../version.h"
  55 #include "nls-enable.h"
  56
  57 const char * program_name = "tune2fs";
  58 char * device_name;
  59 char * new_label, *new_last_mounted, *new_UUID;
  60 static int c_flag, C_flag, e_flag, g_flag, i_flag, l_flag, L_flag;
  61 static int m_flag, M_flag, r_flag, s_flag = -1, u_flag, U_flag;
  62 static int print_label;
  63 static int max_mount_count, mount_count, mount_flags;
  64 static unsigned long interval, reserved_ratio, reserved_blocks;
  65 static unsigned long resgid, resuid;
  66 static unsigned short errors;
  67 static int open_flag;
  68 static char *features_cmd;
  69
  70 int journal_size, journal_flags;
  71 char *journal_device;
  72
  73 static const char *please_fsck = N_("Please run e2fsck on the filesystem.\n");
  74
  75 static void usage(void)
  76 {
  77         fprintf(stderr,
  78                 _("Usage: %s [-c max-mounts-count] [-e errors-behavior] "
  79                   "[-g group]\n"
  80                  "\t[-i interval[d|m|w]] [-j] [-J journal-options]\n"
  81                  "\t[-l] [-s sparse-flag] [-m reserved-blocks-percent]\n"
  82                   "\t[-r reserved-blocks-count] [-u user] [-C mount-count]\n"
  83                   "\t[-L volume-label] [-M last-mounted-dir] [-U UUID]\n"
  84                   "\t[-O [^]feature[,...]] device\n"), program_name);
  85         exit (1);
  86 }
  87
  88 static __u32 ok_features[3] = {
  89         EXT3_FEATURE_COMPAT_HAS_JOURNAL,        /* Compat */
  90         EXT2_FEATURE_INCOMPAT_FILETYPE,         /* Incompat */
  91         EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     /* R/O compat */
  92 };
  93
  94 /*
  95  * Remove an external journal from the filesystem
  96  */
  97 static void remove_journal_device(ext2_filsys fs)
  98 {
  99         char            *journal_device;
 100         ext2_filsys     jfs;
 101         char            buf[1024];
 102         journal_superblock_t    *jsb;
 103         int             i, nr_users;
 104         errcode_t       retval;
 105
 106         journal_device = ext2fs_find_block_device(fs->super->s_journal_dev);
 107         if (!journal_device)
 108                 return;
 109
 110         retval = ext2fs_open(journal_device, EXT2_FLAG_RW|
 111                              EXT2_FLAG_JOURNAL_DEV_OK, 0,
 112                              fs->blocksize, unix_io_manager, &jfs);
 113         if (retval) {
 114                 com_err(program_name, retval,
 115                         _("while trying to open external journal"));
 116                 exit(1);
 117         }
 118         if (!(jfs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
 119                 fprintf(stderr, "%s is not a journal device.\n",
 120                         journal_device);
 121                 exit(1);
 122         }
 123
 124         /* Get the journal superblock */
 125         if ((retval = io_channel_read_blk(jfs->io, 1, -1024, buf))) {
 126                 com_err(program_name, retval,
 127                         _("while reading journal superblock"));
 128                 exit(1);
 129         }
 130
 131         jsb = (journal_superblock_t *) buf;
 132         if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) ||
 133             (jsb->s_header.h_blocktype != (unsigned) ntohl(JFS_SUPERBLOCK_V2))) {
 134                 fprintf(stderr, _("Journal superblock not found!\n"));
 135                 exit(1);
 136         }
 137
 138         /* Find the filesystem UUID */
 139         nr_users = ntohl(jsb->s_nr_users);
 140         for (i=0; i < nr_users; i++) {
 141                 if (memcmp(fs->super->s_uuid,
 142                            &jsb->s_users[i*16], 16) == 0)
 143                         break;
 144         }
 145         if (i >= nr_users) {
 146                 fprintf(stderr, "Filesystem's UUID not found on journal device.\n");
 147                 exit(1);
 148         }
 149         nr_users--;
 150         for (i=0; i < nr_users; i++)
 151                 memcpy(&jsb->s_users[i*16], &jsb->s_users[(i+1)*16], 16);
 152         jsb->s_nr_users = htonl(nr_users);
 153
 154         /* Write back the journal superblock */
 155         if ((retval = io_channel_write_blk(jfs->io, 1, -1024, buf))) {
 156                 com_err(program_name, retval,
 157                         "while writing journal superblock.");
 158                 exit(1);
 159         }
 160
 161         fs->super->s_journal_dev = 0;
 162         memset(fs->super->s_journal_uuid, 0,
 163                sizeof(fs->super->s_journal_uuid));
 164         ext2fs_mark_super_dirty(fs);
 165 }
 166
 167
 168 /*
 169  * Update the feature set as provided by the user.
 170  */
 171 static void update_feature_set(ext2_filsys fs, char *features)
 172 {
 173         int sparse, old_sparse, filetype, old_filetype;
 174         int journal, old_journal;
 175         struct ext2_inode       inode;
 176         struct ext2_super_block *sb= fs->super;
 177         errcode_t               retval;
 178
 179         old_sparse = sb->s_feature_ro_compat &
 180                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 181         old_filetype = sb->s_feature_incompat &
 182                 EXT2_FEATURE_INCOMPAT_FILETYPE;
 183         old_journal = sb->s_feature_compat &
 184                 EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 185         if (e2p_edit_feature(features, &sb->s_feature_compat,
 186                              ok_features)) {
 187                 fprintf(stderr, _("Invalid filesystem option set: %s\n"),
 188                         features);
 189                 exit(1);
 190         }
 191         sparse = sb->s_feature_ro_compat &
 192                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 193         filetype = sb->s_feature_incompat &
 194                 EXT2_FEATURE_INCOMPAT_FILETYPE;
 195         journal = sb->s_feature_compat &
 196                 EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 197         if (old_journal && !journal) {
 198                 if ((mount_flags & EXT2_MF_MOUNTED) &&
 199                     !(mount_flags & EXT2_MF_READONLY)) {
 200                         fprintf(stderr,
 201                                 _("The HAS_JOURNAL flag may only be "
 202                                   "cleared when the filesystem is\n"
 203                                   "unmounted or mounted "
 204                                   "read-only.\n"));
 205                         exit(1);
 206                 }
 207                 if (sb->s_feature_incompat &
 208                     EXT3_FEATURE_INCOMPAT_RECOVER) {
 209                         fprintf(stderr,
 210                                 _("The NEEDS_RECOVERY flag is set.  "
 211                                   "Please run e2fsck before clearing\n"
 212                                   "the HAS_JOURNAL flag.\n"));
 213                         exit(1);
 214                 }
 215                 /*
 216                  * Remove the immutable flag on the journal inode
 217                  */
 218                 if (sb->s_journal_inum) {
 219                         retval = ext2fs_read_inode(fs, sb->s_journal_inum,
 220                                                    &inode);
 221                         if (retval) {
 222                                 com_err(program_name, retval,
 223                                         "while reading journal inode");
 224                                 exit(1);
 225                         }
 226                         inode.i_flags &= ~EXT2_IMMUTABLE_FL;
 227                         retval = ext2fs_write_inode(fs, sb->s_journal_inum,
 228                                                     &inode);
 229                         if (retval) {
 230                                 com_err(program_name, retval,
 231                                         "while write journal inode");
 232                                 exit(1);
 233                         }
 234                 }
 235                 if (sb->s_journal_dev)
 236                         remove_journal_device(fs);
 237         }
 238         if (journal && !old_journal) {
 239                 /*
 240                  * If adding a journal flag, let the create journal
 241                  * code below handle creating setting the flag and
 242                  * creating the journal.  We supply a default size if
 243                  * necessary.
 244                  */
 245                 if (!journal_size)
 246                         journal_size = -1;
 247                 sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 248                 journal = old_journal;
 249         }
 250
 251         if (sb->s_rev_level == EXT2_GOOD_OLD_REV &&
 252             (sb->s_feature_compat || sb->s_feature_ro_compat ||
 253              sb->s_feature_incompat))
 254                 ext2fs_update_dynamic_rev(fs);
 255         if ((sparse != old_sparse) ||
 256             (filetype != old_filetype) ||
 257             (journal != old_journal)) {
 258                 sb->s_state &= ~EXT2_VALID_FS;
 259                 printf("\n%s\n", _(please_fsck));
 260         }
 261         ext2fs_mark_super_dirty(fs);
 262 }
 263
 264 /*
 265  * Add a journal to the filesystem.
 266  */
 267 static void add_journal(ext2_filsys fs)
 268 {
 269         unsigned long journal_blocks;
 270         errcode_t       retval;
 271         ext2_filsys     jfs;
 272
 273         if (fs->super->s_feature_compat &
 274             EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
 275                 fprintf(stderr, _("The filesystem already has a journal.\n"));
 276                 exit(1);
 277         }
 278         if (journal_device) {
 279                 check_plausibility(journal_device);
 280                 check_mount(journal_device, 0, _("journal"));
 281                 retval = ext2fs_open(journal_device, EXT2_FLAG_RW|
 282                                      EXT2_FLAG_JOURNAL_DEV_OK, 0,
 283                                      fs->blocksize, unix_io_manager, &jfs);
 284                 if (retval) {
 285                         com_err(program_name, retval,
 286                                 _("\n\twhile trying to open journal on %s\n"),
 287                                 journal_device);
 288                         exit(1);
 289                 }
 290                 printf(_("Creating journal on device %s: "),
 291                        journal_device);
 292                 fflush(stdout);
 293
 294                 retval = ext2fs_add_journal_device(fs, jfs);
 295                 if (retval) {
 296                         com_err (program_name, retval,
 297                                  _("while trying to create journal on device %s"),
 298                                  journal_device);
 299                         exit(1);
 300                 }
 301                 printf(_("done\n"));
 302                 ext2fs_close(jfs);
 303         } else if (journal_size) {
 304                 printf(_("Creating journal inode: "));
 305                 fflush(stdout);
 306                 journal_blocks = figure_journal_size(journal_size, fs);
 307
 308                 retval = ext2fs_add_journal_inode(fs, journal_blocks,
 309                                                   journal_flags);
 310                 if (retval) {
 311                         printf("\n");
 312                         com_err(program_name, retval,
 313                                 _("\n\twhile trying to create journal file"));
 314                         exit(1);
 315                 } else
 316                         printf(_("done\n"));
 317                 /*
 318                  * If the filesystem wasn't mounted, we need to force
 319                  * the block group descriptors out.
 320                  */
 321                 if ((mount_flags & EXT2_MF_MOUNTED) == 0)
 322                         fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
 323         }
 324 }
 325
 326 /*
 327  * Given argv[0], return the program name.
 328  */
 329 static char *get_progname(char *argv_zero)
 330 {
 331         char    *cp;
 332
 333         cp = strrchr(argv_zero, '/');
 334         if (!cp )
 335                 return argv_zero;
 336         else
 337                 return cp+1;
 338 }
 339
 340
 341 static void parse_e2label_options(int argc, char ** argv)
 342 {
 343         if ((argc < 2) || (argc > 3)) {
 344                 fprintf(stderr, _("Usage: e2label device [newlabel]\n"));
 345                 exit(1);
 346         }
 347         device_name = argv[1];
 348         if (argc == 3) {
 349                 open_flag = EXT2_FLAG_RW;
 350                 L_flag = 1;
 351                 new_label = argv[2];
 352         } else
 353                 print_label++;
 354 }
 355
 356
 357 static void parse_tune2fs_options(int argc, char **argv)
 358 {
 359         int c;
 360         char * tmp;
 361         struct group * gr;
 362         struct passwd * pw;
 363
 364         fprintf (stderr, _("tune2fs %s, %s for EXT2 FS %s, %s\n"),
 365                  E2FSPROGS_VERSION, E2FSPROGS_DATE,
 366                  EXT2FS_VERSION, EXT2FS_DATE);
 367         while ((c = getopt (argc, argv, "c:e:g:i:jlm:r:s:u:C:J:L:M:O:U:")) != EOF)
 368                 switch (c)
 369                 {
 370                         case 'c':
 371                                 max_mount_count = strtol (optarg, &tmp, 0);
 372                                 if (*tmp || max_mount_count > 16000) {
 373                                         com_err (program_name, 0,
 374                                                  _("bad mounts count - %s"),
 375                                                  optarg);
 376                                         usage();
 377                                 }
 378                                 c_flag = 1;
 379                                 open_flag = EXT2_FLAG_RW;
 380                                 break;
 381                         case 'C':
 382                                 mount_count = strtoul (optarg, &tmp, 0);
 383                                 if (*tmp || mount_count > 16000) {
 384                                         com_err (program_name, 0,
 385                                                  _("bad mounts count - %s"),
 386                                                  optarg);
 387                                         usage();
 388                                 }
 389                                 C_flag = 1;
 390                                 open_flag = EXT2_FLAG_RW;
 391                                 break;
 392                         case 'e':
 393                                 if (strcmp (optarg, "continue") == 0)
 394                                         errors = EXT2_ERRORS_CONTINUE;
 395                                 else if (strcmp (optarg, "remount-ro") == 0)
 396                                         errors = EXT2_ERRORS_RO;
 397                                 else if (strcmp (optarg, "panic") == 0)
 398                                         errors = EXT2_ERRORS_PANIC;
 399                                 else {
 400                                         com_err (program_name, 0,
 401                                                  _("bad error behavior - %s"),
 402                                                  optarg);
 403                                         usage();
 404                                 }
 405                                 e_flag = 1;
 406                                 open_flag = EXT2_FLAG_RW;
 407                                 break;
 408                         case 'g':
 409                                 resgid = strtoul (optarg, &tmp, 0);
 410                                 if (*tmp) {
 411                                         gr = getgrnam (optarg);
 412                                         if (gr == NULL)
 413                                                 tmp = optarg;
 414                                         else {
 415                                                 resgid = gr->gr_gid;
 416                                                 *tmp =0;
 417                                         }
 418                                 }
 419                                 if (*tmp) {
 420                                         com_err (program_name, 0,
 421                                                  _("bad gid/group name - %s"),
 422                                                  optarg);
 423                                         usage();
 424                                 }
 425                                 g_flag = 1;
 426                                 open_flag = EXT2_FLAG_RW;
 427                                 break;
 428                         case 'i':
 429                                 interval = strtoul (optarg, &tmp, 0);
 430                                 switch (*tmp) {
 431                                 case 's':
 432                                         tmp++;
 433                                         break;
 434                                 case '\0':
 435                                 case 'd':
 436                                 case 'D': /* days */
 437                                         interval *= 86400;
 438                                         if (*tmp != '\0')
 439                                                 tmp++;
 440                                         break;
 441                                 case 'm':
 442                                 case 'M': /* months! */
 443                                         interval *= 86400 * 30;
 444                                         tmp++;
 445                                         break;
 446                                 case 'w':
 447                                 case 'W': /* weeks */
 448                                         interval *= 86400 * 7;
 449                                         tmp++;
 450                                         break;
 451                                 }
 452                                 if (*tmp || interval > (365 * 86400)) {
 453                                         com_err (program_name, 0,
 454                                                 _("bad interval - %s"), optarg);
 455                                         usage();
 456                                 }
 457                                 i_flag = 1;
 458                                 open_flag = EXT2_FLAG_RW;
 459                                 break;
 460                         case 'j':
 461                                 if (!journal_size)
 462                                         journal_size = -1;
 463                                 break;
 464                         case 'J':
 465                                 parse_journal_opts(optarg);
 466                                 open_flag = EXT2_FLAG_RW;
 467                                 break;
 468                         case 'l':
 469                                 l_flag = 1;
 470                                 break;
 471                         case 'L':
 472                                 new_label = optarg;
 473                                 L_flag = 1;
 474                                 open_flag = EXT2_FLAG_RW;
 475                                 break;
 476                         case 'm':
 477                                 reserved_ratio = strtoul (optarg, &tmp, 0);
 478                                 if (*tmp || reserved_ratio > 50) {
 479                                         com_err (program_name, 0,
 480                                                  _("bad reserved block ratio - %s"),
 481                                                  optarg);
 482                                         usage();
 483                                 }
 484                                 m_flag = 1;
 485                                 open_flag = EXT2_FLAG_RW;
 486                                 break;
 487                         case 'M':
 488                                 new_last_mounted = optarg;
 489                                 M_flag = 1;
 490                                 open_flag = EXT2_FLAG_RW;
 491                                 break;
 492                         case 'O':
 493                                 features_cmd = optarg;
 494                                 open_flag = EXT2_FLAG_RW;
 495                                 break;
 496                         case 'r':
 497                                 reserved_blocks = strtoul (optarg, &tmp, 0);
 498                                 if (*tmp) {
 499                                         com_err (program_name, 0,
 500                                                  _("bad reserved blocks count - %s"),
 501                                                  optarg);
 502                                         usage();
 503                                 }
 504                                 r_flag = 1;
 505                                 open_flag = EXT2_FLAG_RW;
 506                                 break;
 507                         case 's':
 508                                 s_flag = atoi(optarg);
 509                                 open_flag = EXT2_FLAG_RW;
 510                                 break;
 511                         case 'u':
 512                                 resuid = strtoul (optarg, &tmp, 0);
 513                                 if (*tmp) {
 514                                         pw = getpwnam (optarg);
 515                                         if (pw == NULL)
 516                                                 tmp = optarg;
 517                                         else {
 518                                                 resuid = pw->pw_uid;
 519                                                 *tmp = 0;
 520                                         }
 521                                 }
 522                                 if (*tmp) {
 523                                         com_err (program_name, 0,
 524                                                  _("bad uid/user name - %s"),
 525                                                  optarg);
 526                                         usage();
 527                                 }
 528                                 u_flag = 1;
 529                                 open_flag = EXT2_FLAG_RW;
 530                                 break;
 531                         case 'U':
 532                                 new_UUID = optarg;
 533                                 U_flag = 1;
 534                                 open_flag = EXT2_FLAG_RW;
 535                                 break;
 536                         default:
 537                                 usage();
 538                 }
 539         if (optind < argc - 1 || optind == argc)
 540                 usage();
 541         if (!open_flag && !l_flag)
 542                 usage();
 543         device_name = argv[optind];
 544 }
 545
 546
 547
 548 int main (int argc, char ** argv)
 549 {
 550         errcode_t retval;
 551         ext2_filsys fs;
 552         struct ext2_super_block *sb;
 553
 554 #ifdef ENABLE_NLS
 555         setlocale(LC_MESSAGES, "");
 556         bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
 557         textdomain(NLS_CAT_NAME);
 558 #endif
 559         if (argc && *argv)
 560                 program_name = *argv;
 561         initialize_ext2_error_table();
 562
 563         if (strcmp(get_progname(argv[0]), "e2label") == 0)
 564                 parse_e2label_options(argc, argv);
 565         else
 566                 parse_tune2fs_options(argc, argv);
 567
 568         retval = ext2fs_open (device_name, open_flag, 0, 0,
 569                               unix_io_manager, &fs);
 570         if (retval) {
 571                 com_err (program_name, retval, _("while trying to open %s"),
 572                          device_name);
 573                 printf(_("Couldn't find valid filesystem superblock.\n"));
 574                 exit(1);
 575         }
 576         sb = fs->super;
 577         if (print_label) {
 578                 /* For e2label emulation */
 579                 printf("%.*s\n", (int) sizeof(sb->s_volume_name),
 580                        sb->s_volume_name);
 581                 exit(0);
 582         }
 583         retval = ext2fs_check_if_mounted(device_name, &mount_flags);
 584         if (retval) {
 585                 com_err("ext2fs_check_if_mount", retval,
 586                         _("while determining whether %s is mounted."),
 587                         device_name);
 588                 exit(1);
 589         }
 590         /* Normally we only need to write out the superblock */
 591         fs->flags |= EXT2_FLAG_SUPER_ONLY;
 592
 593         if (c_flag) {
 594                 sb->s_max_mnt_count = max_mount_count;
 595                 ext2fs_mark_super_dirty(fs);
 596                 printf (_("Setting maximal mount count to %d\n"),
 597                         max_mount_count);
 598         }
 599         if (C_flag) {
 600                 sb->s_mnt_count = mount_count;
 601                 ext2fs_mark_super_dirty(fs);
 602                 printf (_("Setting current mount count to %d\n"), mount_count);
 603         }
 604         if (e_flag) {
 605                 sb->s_errors = errors;
 606                 ext2fs_mark_super_dirty(fs);
 607                 printf (_("Setting error behavior to %d\n"), errors);
 608         }
 609         if (g_flag) {
 610                 sb->s_def_resgid = resgid;
 611                 ext2fs_mark_super_dirty(fs);
 612                 printf (_("Setting reserved blocks gid to %lu\n"), resgid);
 613         }
 614         if (i_flag) {
 615                 sb->s_checkinterval = interval;
 616                 ext2fs_mark_super_dirty(fs);
 617                 printf (_("Setting interval between check %lu seconds\n"), interval);
 618         }
 619         if (m_flag) {
 620                 sb->s_r_blocks_count = (sb->s_blocks_count / 100)
 621                         * reserved_ratio;
 622                 ext2fs_mark_super_dirty(fs);
 623                 printf (_("Setting reserved blocks percentage to %lu (%u blocks)\n"),
 624                         reserved_ratio, sb->s_r_blocks_count);
 625         }
 626         if (r_flag) {
 627                 if (reserved_blocks >= sb->s_blocks_count) {
 628                         com_err (program_name, 0,
 629                                  _("reserved blocks count is too big (%ul)"),
 630                                  reserved_blocks);
 631                         exit (1);
 632                 }
 633                 sb->s_r_blocks_count = reserved_blocks;
 634                 ext2fs_mark_super_dirty(fs);
 635                 printf (_("Setting reserved blocks count to %lu\n"),
 636                         reserved_blocks);
 637         }
 638         if (s_flag == 1) {
 639                 if (sb->s_feature_ro_compat &
 640                     EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)
 641                         fprintf(stderr, _("\nThe filesystem already"
 642                                 " has sparse superblocks.\n"));
 643                 else {
 644                         sb->s_feature_ro_compat |=
 645                                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 646                         sb->s_state &= ~EXT2_VALID_FS;
 647                         ext2fs_mark_super_dirty(fs);
 648                         printf(_("\nSparse superblock flag set.  %s"),
 649                                _(please_fsck));
 650                 }
 651         }
 652         if (s_flag == 0) {
 653                 if (!(sb->s_feature_ro_compat &
 654                       EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER))
 655                         fprintf(stderr, _("\nThe filesystem already"
 656                                 " has sparse superblocks disabled.\n"));
 657                 else {
 658                         sb->s_feature_ro_compat &=
 659                                 ~EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 660                         sb->s_state &= ~EXT2_VALID_FS;
 661                         fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
 662                         ext2fs_mark_super_dirty(fs);
 663                         printf(_("\nSparse superblock flag cleared.  %s"),
 664                                _(please_fsck));
 665                 }
 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                         fprintf(stderr, _("Warning: label too "
 675                                 "long, truncating.\n"));
 676                 memset(sb->s_volume_name, 0, sizeof(sb->s_volume_name));
 677                 strncpy(sb->s_volume_name, new_label,
 678                         sizeof(sb->s_volume_name));
 679                 ext2fs_mark_super_dirty(fs);
 680         }
 681         if (M_flag) {
 682                 memset(sb->s_last_mounted, 0, sizeof(sb->s_last_mounted));
 683                 strncpy(sb->s_last_mounted, new_last_mounted,
 684                         sizeof(sb->s_last_mounted));
 685                 ext2fs_mark_super_dirty(fs);
 686         }
 687         if (features_cmd)
 688                 update_feature_set(fs, features_cmd);
 689         if (journal_size || journal_device)
 690                 add_journal(fs);
 691
 692         if (U_flag) {
 693                 if (strcasecmp(new_UUID, "null") == 0) {
 694                         uuid_clear(sb->s_uuid);
 695                 } else if (strcasecmp(new_UUID, "time") == 0) {
 696                         uuid_generate_time(sb->s_uuid);
 697                 } else if (strcasecmp(new_UUID, "random") == 0) {
 698                         uuid_generate(sb->s_uuid);
 699                 } else if (uuid_parse(new_UUID, sb->s_uuid)) {
 700                         com_err(program_name, 0, _("Invalid UUID format\n"));
 701                         exit(1);
 702                 }
 703                 ext2fs_mark_super_dirty(fs);
 704         }
 705
 706         if (l_flag)
 707                 list_super (sb);
 708         ext2fs_close (fs);
 709         exit (0);
 710 }