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 "ext2fs/ext2_fs.h"
  45 #include "ext2fs/ext2fs.h"
  46 #include "et/com_err.h"
  47 #include "uuid/uuid.h"
  48 #include "e2p/e2p.h"
  49 #include "jfs_user.h"
  50 #include "util.h"
  51 #include "get_device_by_label.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         int             check_uuid = 1;
 106
 107         if (f_flag)
 108                 commit_remove_journal = 1; /* force removal even if error */
 109
 110         uuid_unparse(fs->super->s_journal_uuid, buf);
 111         journal_device = get_spec_by_uuid(buf);
 112
 113         if (!journal_device) {
 114                 journal_device =
 115                         ext2fs_find_block_device(fs->super->s_journal_dev);
 116                 if (!journal_device)
 117                         return;
 118         }
 119
 120         retval = ext2fs_open(journal_device, EXT2_FLAG_RW|
 121                              EXT2_FLAG_JOURNAL_DEV_OK, 0,
 122                              fs->blocksize, unix_io_manager, &jfs);
 123         if (retval) {
 124                 com_err(program_name, retval,
 125                         _("while trying to open external journal"));
 126                 goto no_valid_journal;
 127         }
 128         if (!(jfs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
 129                 fprintf(stderr, _("%s is not a journal device.\n"),
 130                         journal_device);
 131                 goto no_valid_journal;
 132         }
 133
 134         /* Get the journal superblock */
 135         if ((retval = io_channel_read_blk(jfs->io, 1, -1024, buf))) {
 136                 com_err(program_name, retval,
 137                         _("while reading journal superblock"));
 138                 goto no_valid_journal;
 139         }
 140
 141         jsb = (journal_superblock_t *) buf;
 142         if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) ||
 143             (jsb->s_header.h_blocktype != (unsigned) ntohl(JFS_SUPERBLOCK_V2))) {
 144                 fprintf(stderr, _("Journal superblock not found!\n"));
 145                 goto no_valid_journal;
 146         }
 147
 148         /* Find the filesystem UUID */
 149         nr_users = ntohl(jsb->s_nr_users);
 150         for (i=0; i < nr_users; i++) {
 151                 if (memcmp(fs->super->s_uuid,
 152                            &jsb->s_users[i*16], 16) == 0)
 153                         break;
 154         }
 155         if (i >= nr_users) {
 156                 fprintf(stderr,
 157                         _("Filesystem's UUID not found on journal device.\n"));
 158                 commit_remove_journal = 1;
 159                 goto no_valid_journal;
 160         }
 161         nr_users--;
 162         for (i=0; i < nr_users; i++)
 163                 memcpy(&jsb->s_users[i*16], &jsb->s_users[(i+1)*16], 16);
 164         jsb->s_nr_users = htonl(nr_users);
 165
 166         /* Write back the journal superblock */
 167         if ((retval = io_channel_write_blk(jfs->io, 1, -1024, buf))) {
 168                 com_err(program_name, retval,
 169                         "while writing journal superblock.");
 170                 goto no_valid_journal;
 171         }
 172
 173         commit_remove_journal = 1;
 174
 175 no_valid_journal:
 176         if (commit_remove_journal == 0) {
 177                 fprintf(stderr, _("Journal NOT removed\n"));
 178                 exit(1);
 179         }
 180         fs->super->s_journal_dev = 0;
 181         memset(fs->super->s_journal_uuid, 0,
 182                sizeof(fs->super->s_journal_uuid));
 183         ext2fs_mark_super_dirty(fs);
 184         printf(_("Journal removed\n"));
 185         free(journal_device);
 186 }
 187
 188 /* Helper function for remove_journal_inode */
 189 static int release_blocks_proc(ext2_filsys fs, blk_t *blocknr,
 190                                int blockcnt, void *private)
 191 {
 192         blk_t   block;
 193         int     group;
 194
 195         block = *blocknr;
 196         ext2fs_unmark_block_bitmap(fs->block_map,block);
 197         group = ext2fs_group_of_blk(fs, block);
 198         fs->group_desc[group].bg_free_blocks_count++;
 199         fs->super->s_free_blocks_count++;
 200         return 0;
 201 }
 202
 203 /*
 204  * Remove the journal inode from the filesystem
 205  */
 206 static void remove_journal_inode(ext2_filsys fs)
 207 {
 208         struct ext2_inode       inode;
 209         errcode_t               retval;
 210         ino_t                   ino = fs->super->s_journal_inum;
 211         int                     group;
 212
 213         retval = ext2fs_read_inode(fs, ino,  &inode);
 214         if (retval) {
 215                 com_err(program_name, retval,
 216                         _("while reading journal inode"));
 217                 exit(1);
 218         }
 219         if (ino == EXT2_JOURNAL_INO) {
 220                 retval = ext2fs_read_bitmaps(fs);
 221                 if (retval) {
 222                         com_err(program_name, retval,
 223                                 _("while reading bitmaps"));
 224                         exit(1);
 225                 }
 226                 retval = ext2fs_block_iterate(fs, ino, 0, NULL,
 227                                               release_blocks_proc, NULL);
 228                 if (retval) {
 229                         com_err(program_name, retval,
 230                                 _("while clearing journal inode"));
 231                         exit(1);
 232                 }
 233                 memset(&inode, 0, sizeof(inode));
 234                 ext2fs_mark_bb_dirty(fs);
 235                 group = ext2fs_group_of_ino(fs, ino);
 236                 fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
 237         } else
 238                 inode.i_flags &= ~EXT2_IMMUTABLE_FL;
 239         retval = ext2fs_write_inode(fs, ino, &inode);
 240         if (retval) {
 241                 com_err(program_name, retval,
 242                         _("while writing journal inode"));
 243                 exit(1);
 244         }
 245         fs->super->s_journal_inum = 0;
 246         ext2fs_mark_super_dirty(fs);
 247 }
 248
 249 /*
 250  * Update the feature set as provided by the user.
 251  */
 252 static void update_feature_set(ext2_filsys fs, char *features)
 253 {
 254         int sparse, old_sparse, filetype, old_filetype;
 255         int journal, old_journal;
 256         struct ext2_inode       inode;
 257         struct ext2_super_block *sb= fs->super;
 258         errcode_t               retval;
 259
 260         old_sparse = sb->s_feature_ro_compat &
 261                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 262         old_filetype = sb->s_feature_incompat &
 263                 EXT2_FEATURE_INCOMPAT_FILETYPE;
 264         old_journal = sb->s_feature_compat &
 265                 EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 266         if (e2p_edit_feature(features, &sb->s_feature_compat,
 267                              ok_features)) {
 268                 fprintf(stderr, _("Invalid filesystem option set: %s\n"),
 269                         features);
 270                 exit(1);
 271         }
 272         sparse = sb->s_feature_ro_compat &
 273                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 274         filetype = sb->s_feature_incompat &
 275                 EXT2_FEATURE_INCOMPAT_FILETYPE;
 276         journal = sb->s_feature_compat &
 277                 EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 278         if (old_journal && !journal) {
 279                 if ((mount_flags & EXT2_MF_MOUNTED) &&
 280                     !(mount_flags & EXT2_MF_READONLY)) {
 281                         fprintf(stderr,
 282                                 _("The has_journal flag may only be "
 283                                   "cleared when the filesystem is\n"
 284                                   "unmounted or mounted "
 285                                   "read-only.\n"));
 286                         exit(1);
 287                 }
 288                 if (sb->s_feature_incompat &
 289                     EXT3_FEATURE_INCOMPAT_RECOVER) {
 290                         fprintf(stderr,
 291                                 _("The needs_recovery flag is set.  "
 292                                   "Please run e2fsck before clearing\n"
 293                                   "the has_journal flag.\n"));
 294                         exit(1);
 295                 }
 296                 if (sb->s_journal_inum) {
 297                         remove_journal_inode(fs);
 298                 }
 299                 if (sb->s_journal_dev) {
 300                         remove_journal_device(fs);
 301                 }
 302         }
 303         if (journal && !old_journal) {
 304                 /*
 305                  * If adding a journal flag, let the create journal
 306                  * code below handle creating setting the flag and
 307                  * creating the journal.  We supply a default size if
 308                  * necessary.
 309                  */
 310                 if (!journal_size)
 311                         journal_size = -1;
 312                 sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 313         }
 314
 315         if (sb->s_rev_level == EXT2_GOOD_OLD_REV &&
 316             (sb->s_feature_compat || sb->s_feature_ro_compat ||
 317              sb->s_feature_incompat))
 318                 ext2fs_update_dynamic_rev(fs);
 319         if ((sparse != old_sparse) ||
 320             (filetype != old_filetype)) {
 321                 sb->s_state &= ~EXT2_VALID_FS;
 322                 printf("\n%s\n", _(please_fsck));
 323         }
 324         ext2fs_mark_super_dirty(fs);
 325 }
 326
 327 /*
 328  * Add a journal to the filesystem.
 329  */
 330 static void add_journal(ext2_filsys fs)
 331 {
 332         unsigned long journal_blocks;
 333         errcode_t       retval;
 334         ext2_filsys     jfs;
 335
 336         if (fs->super->s_feature_compat &
 337             EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
 338                 fprintf(stderr, _("The filesystem already has a journal.\n"));
 339                 goto err;
 340         }
 341         if (journal_device) {
 342                 check_plausibility(journal_device);
 343                 check_mount(journal_device, 0, _("journal"));
 344                 retval = ext2fs_open(journal_device, EXT2_FLAG_RW|
 345                                      EXT2_FLAG_JOURNAL_DEV_OK, 0,
 346                                      fs->blocksize, unix_io_manager, &jfs);
 347                 if (retval) {
 348                         com_err(program_name, retval,
 349                                 _("\n\twhile trying to open journal on %s\n"),
 350                                 journal_device);
 351                         goto err;
 352                 }
 353                 printf(_("Creating journal on device %s: "),
 354                        journal_device);
 355                 fflush(stdout);
 356
 357                 retval = ext2fs_add_journal_device(fs, jfs);
 358                 ext2fs_close(jfs);
 359                 if (retval) {
 360                         com_err (program_name, retval,
 361                                  _("while adding filesystem to journal on %s"),
 362                                  journal_device);
 363                         goto err;
 364                 }
 365                 printf(_("done\n"));
 366         } else if (journal_size) {
 367                 printf(_("Creating journal inode: "));
 368                 fflush(stdout);
 369                 journal_blocks = figure_journal_size(journal_size, fs);
 370
 371                 retval = ext2fs_add_journal_inode(fs, journal_blocks,
 372                                                   journal_flags);
 373                 if (retval) {
 374                         fprintf(stderr, "\n");
 375                         com_err(program_name, retval,
 376                                 _("\n\twhile trying to create journal file"));
 377                         exit(1);
 378                 } else
 379                         printf(_("done\n"));
 380                 /*
 381                  * If the filesystem wasn't mounted, we need to force
 382                  * the block group descriptors out.
 383                  */
 384                 if ((mount_flags & EXT2_MF_MOUNTED) == 0)
 385                         fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
 386         }
 387         print_check_message(fs);
 388         return;
 389
 390 err:
 391         if (journal_device)
 392                 free(journal_device);
 393         exit(1);
 394 }
 395
 396 /*
 397  * Given argv[0], return the program name.
 398  */
 399 static char *get_progname(char *argv_zero)
 400 {
 401         char    *cp;
 402
 403         cp = strrchr(argv_zero, '/');
 404         if (!cp )
 405                 return argv_zero;
 406         else
 407                 return cp+1;
 408 }
 409
 410
 411 static void parse_e2label_options(int argc, char ** argv)
 412 {
 413         if ((argc < 2) || (argc > 3)) {
 414                 fprintf(stderr, _("Usage: e2label device [newlabel]\n"));
 415                 exit(1);
 416         }
 417         device_name = argv[1];
 418         if (argc == 3) {
 419                 open_flag = EXT2_FLAG_RW | EXT2_FLAG_JOURNAL_DEV_OK;
 420                 L_flag = 1;
 421                 new_label = argv[2];
 422         } else
 423                 print_label++;
 424 }
 425
 426
 427 static void parse_tune2fs_options(int argc, char **argv)
 428 {
 429         int c;
 430         char * tmp;
 431         struct group * gr;
 432         struct passwd * pw;
 433
 434         printf(_("tune2fs %s, %s for EXT2 FS %s, %s\n"),
 435                  E2FSPROGS_VERSION, E2FSPROGS_DATE,
 436                  EXT2FS_VERSION, EXT2FS_DATE);
 437         while ((c = getopt (argc, argv, "c:e:fg:i:jlm:r:s:u:C:J:L:M:O:U:")) != EOF)
 438                 switch (c)
 439                 {
 440                         case 'c':
 441                                 max_mount_count = strtol (optarg, &tmp, 0);
 442                                 if (*tmp || max_mount_count > 16000) {
 443                                         com_err (program_name, 0,
 444                                                  _("bad mounts count - %s"),
 445                                                  optarg);
 446                                         usage();
 447                                 }
 448                                 if (max_mount_count == 0)
 449                                         max_mount_count = -1;
 450                                 c_flag = 1;
 451                                 open_flag = EXT2_FLAG_RW;
 452                                 break;
 453                         case 'C':
 454                                 mount_count = strtoul (optarg, &tmp, 0);
 455                                 if (*tmp || mount_count > 16000) {
 456                                         com_err (program_name, 0,
 457                                                  _("bad mounts count - %s"),
 458                                                  optarg);
 459                                         usage();
 460                                 }
 461                                 C_flag = 1;
 462                                 open_flag = EXT2_FLAG_RW;
 463                                 break;
 464                         case 'e':
 465                                 if (strcmp (optarg, "continue") == 0)
 466                                         errors = EXT2_ERRORS_CONTINUE;
 467                                 else if (strcmp (optarg, "remount-ro") == 0)
 468                                         errors = EXT2_ERRORS_RO;
 469                                 else if (strcmp (optarg, "panic") == 0)
 470                                         errors = EXT2_ERRORS_PANIC;
 471                                 else {
 472                                         com_err (program_name, 0,
 473                                                  _("bad error behavior - %s"),
 474                                                  optarg);
 475                                         usage();
 476                                 }
 477                                 e_flag = 1;
 478                                 open_flag = EXT2_FLAG_RW;
 479                                 break;
 480                         case 'f': /* Force */
 481                                 f_flag = 1;
 482                                 break;
 483                         case 'g':
 484                                 resgid = strtoul (optarg, &tmp, 0);
 485                                 if (*tmp) {
 486                                         gr = getgrnam (optarg);
 487                                         if (gr == NULL)
 488                                                 tmp = optarg;
 489                                         else {
 490                                                 resgid = gr->gr_gid;
 491                                                 *tmp =0;
 492                                         }
 493                                 }
 494                                 if (*tmp) {
 495                                         com_err (program_name, 0,
 496                                                  _("bad gid/group name - %s"),
 497                                                  optarg);
 498                                         usage();
 499                                 }
 500                                 g_flag = 1;
 501                                 open_flag = EXT2_FLAG_RW;
 502                                 break;
 503                         case 'i':
 504                                 interval = strtoul (optarg, &tmp, 0);
 505                                 switch (*tmp) {
 506                                 case 's':
 507                                         tmp++;
 508                                         break;
 509                                 case '\0':
 510                                 case 'd':
 511                                 case 'D': /* days */
 512                                         interval *= 86400;
 513                                         if (*tmp != '\0')
 514                                                 tmp++;
 515                                         break;
 516                                 case 'm':
 517                                 case 'M': /* months! */
 518                                         interval *= 86400 * 30;
 519                                         tmp++;
 520                                         break;
 521                                 case 'w':
 522                                 case 'W': /* weeks */
 523                                         interval *= 86400 * 7;
 524                                         tmp++;
 525                                         break;
 526                                 }
 527                                 if (*tmp || interval > (365 * 86400)) {
 528                                         com_err (program_name, 0,
 529                                                 _("bad interval - %s"), optarg);
 530                                         usage();
 531                                 }
 532                                 i_flag = 1;
 533                                 open_flag = EXT2_FLAG_RW;
 534                                 break;
 535                         case 'j':
 536                                 if (!journal_size)
 537                                         journal_size = -1;
 538                                 open_flag = EXT2_FLAG_RW;
 539                                 break;
 540                         case 'J':
 541                                 parse_journal_opts(optarg);
 542                                 open_flag = EXT2_FLAG_RW;
 543                                 break;
 544                         case 'l':
 545                                 l_flag = 1;
 546                                 break;
 547                         case 'L':
 548                                 new_label = optarg;
 549                                 L_flag = 1;
 550                                 open_flag = EXT2_FLAG_RW |
 551                                         EXT2_FLAG_JOURNAL_DEV_OK;
 552                                 break;
 553                         case 'm':
 554                                 reserved_ratio = strtoul (optarg, &tmp, 0);
 555                                 if (*tmp || reserved_ratio > 50) {
 556                                         com_err (program_name, 0,
 557                                                  _("bad reserved block ratio - %s"),
 558                                                  optarg);
 559                                         usage();
 560                                 }
 561                                 m_flag = 1;
 562                                 open_flag = EXT2_FLAG_RW;
 563                                 break;
 564                         case 'M':
 565                                 new_last_mounted = optarg;
 566                                 M_flag = 1;
 567                                 open_flag = EXT2_FLAG_RW;
 568                                 break;
 569                         case 'O':
 570                                 if (features_cmd) {
 571                                         com_err (program_name, 0,
 572                                          _("-O may only be specified once"));
 573                                         usage();
 574                                 }
 575                                 features_cmd = optarg;
 576                                 open_flag = EXT2_FLAG_RW;
 577                                 break;
 578                         case 'r':
 579                                 reserved_blocks = strtoul (optarg, &tmp, 0);
 580                                 if (*tmp) {
 581                                         com_err (program_name, 0,
 582                                                  _("bad reserved blocks count - %s"),
 583                                                  optarg);
 584                                         usage();
 585                                 }
 586                                 r_flag = 1;
 587                                 open_flag = EXT2_FLAG_RW;
 588                                 break;
 589                         case 's':
 590                                 s_flag = atoi(optarg);
 591                                 open_flag = EXT2_FLAG_RW;
 592                                 break;
 593                         case 'u':
 594                                 resuid = strtoul (optarg, &tmp, 0);
 595                                 if (*tmp) {
 596                                         pw = getpwnam (optarg);
 597                                         if (pw == NULL)
 598                                                 tmp = optarg;
 599                                         else {
 600                                                 resuid = pw->pw_uid;
 601                                                 *tmp = 0;
 602                                         }
 603                                 }
 604                                 if (*tmp) {
 605                                         com_err (program_name, 0,
 606                                                  _("bad uid/user name - %s"),
 607                                                  optarg);
 608                                         usage();
 609                                 }
 610                                 u_flag = 1;
 611                                 open_flag = EXT2_FLAG_RW;
 612                                 break;
 613                         case 'U':
 614                                 new_UUID = optarg;
 615                                 U_flag = 1;
 616                                 open_flag = EXT2_FLAG_RW |
 617                                         EXT2_FLAG_JOURNAL_DEV_OK;
 618                                 break;
 619                         default:
 620                                 usage();
 621                 }
 622         if (optind < argc - 1 || optind == argc)
 623                 usage();
 624         if (!open_flag && !l_flag)
 625                 usage();
 626         device_name = argv[optind];
 627 }
 628
 629
 630
 631 int main (int argc, char ** argv)
 632 {
 633         errcode_t retval;
 634         ext2_filsys fs;
 635         struct ext2_super_block *sb;
 636
 637 #ifdef ENABLE_NLS
 638         setlocale(LC_MESSAGES, "");
 639         bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
 640         textdomain(NLS_CAT_NAME);
 641 #endif
 642         if (argc && *argv)
 643                 program_name = *argv;
 644         initialize_ext2_error_table();
 645
 646         if (strcmp(get_progname(argv[0]), "e2label") == 0)
 647                 parse_e2label_options(argc, argv);
 648         else
 649                 parse_tune2fs_options(argc, argv);
 650
 651         retval = ext2fs_open (device_name, open_flag, 0, 0,
 652                               unix_io_manager, &fs);
 653         if (retval) {
 654                 com_err (program_name, retval, _("while trying to open %s"),
 655                          device_name);
 656                 fprintf(stderr,
 657                         _("Couldn't find valid filesystem superblock.\n"));
 658                 exit(1);
 659         }
 660         sb = fs->super;
 661         if (print_label) {
 662                 /* For e2label emulation */
 663                 printf("%.*s\n", (int) sizeof(sb->s_volume_name),
 664                        sb->s_volume_name);
 665                 exit(0);
 666         }
 667         retval = ext2fs_check_if_mounted(device_name, &mount_flags);
 668         if (retval) {
 669                 com_err("ext2fs_check_if_mount", retval,
 670                         _("while determining whether %s is mounted."),
 671                         device_name);
 672                 exit(1);
 673         }
 674         /* Normally we only need to write out the superblock */
 675         fs->flags |= EXT2_FLAG_SUPER_ONLY;
 676
 677         if (c_flag) {
 678                 sb->s_max_mnt_count = max_mount_count;
 679                 ext2fs_mark_super_dirty(fs);
 680                 printf (_("Setting maximal mount count to %d\n"),
 681                         max_mount_count);
 682         }
 683         if (C_flag) {
 684                 sb->s_mnt_count = mount_count;
 685                 ext2fs_mark_super_dirty(fs);
 686                 printf (_("Setting current mount count to %d\n"), mount_count);
 687         }
 688         if (e_flag) {
 689                 sb->s_errors = errors;
 690                 ext2fs_mark_super_dirty(fs);
 691                 printf (_("Setting error behavior to %d\n"), errors);
 692         }
 693         if (g_flag) {
 694                 sb->s_def_resgid = resgid;
 695                 ext2fs_mark_super_dirty(fs);
 696                 printf (_("Setting reserved blocks gid to %lu\n"), resgid);
 697         }
 698         if (i_flag) {
 699                 sb->s_checkinterval = interval;
 700                 ext2fs_mark_super_dirty(fs);
 701                 printf (_("Setting interval between check %lu seconds\n"), interval);
 702         }
 703         if (m_flag) {
 704                 sb->s_r_blocks_count = (sb->s_blocks_count / 100)
 705                         * reserved_ratio;
 706                 ext2fs_mark_super_dirty(fs);
 707                 printf (_("Setting reserved blocks percentage to %lu (%u blocks)\n"),
 708                         reserved_ratio, sb->s_r_blocks_count);
 709         }
 710         if (r_flag) {
 711                 if (reserved_blocks >= sb->s_blocks_count) {
 712                         com_err (program_name, 0,
 713                                  _("reserved blocks count is too big (%ul)"),
 714                                  reserved_blocks);
 715                         exit (1);
 716                 }
 717                 sb->s_r_blocks_count = reserved_blocks;
 718                 ext2fs_mark_super_dirty(fs);
 719                 printf (_("Setting reserved blocks count to %lu\n"),
 720                         reserved_blocks);
 721         }
 722         if (s_flag == 1) {
 723                 if (sb->s_feature_ro_compat &
 724                     EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)
 725                         fprintf(stderr, _("\nThe filesystem already"
 726                                 " has sparse superblocks.\n"));
 727                 else {
 728                         sb->s_feature_ro_compat |=
 729                                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 730                         sb->s_state &= ~EXT2_VALID_FS;
 731                         ext2fs_mark_super_dirty(fs);
 732                         printf(_("\nSparse superblock flag set.  %s"),
 733                                _(please_fsck));
 734                 }
 735         }
 736         if (s_flag == 0) {
 737                 if (!(sb->s_feature_ro_compat &
 738                       EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER))
 739                         fprintf(stderr, _("\nThe filesystem already"
 740                                 " has sparse superblocks disabled.\n"));
 741                 else {
 742                         sb->s_feature_ro_compat &=
 743                                 ~EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 744                         sb->s_state &= ~EXT2_VALID_FS;
 745                         fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
 746                         ext2fs_mark_super_dirty(fs);
 747                         printf(_("\nSparse superblock flag cleared.  %s"),
 748                                _(please_fsck));
 749                 }
 750         }
 751         if (u_flag) {
 752                 sb->s_def_resuid = resuid;
 753                 ext2fs_mark_super_dirty(fs);
 754                 printf (_("Setting reserved blocks uid to %lu\n"), resuid);
 755         }
 756         if (L_flag) {
 757                 if (strlen(new_label) > sizeof(sb->s_volume_name))
 758                         fprintf(stderr, _("Warning: label too "
 759                                 "long, truncating.\n"));
 760                 memset(sb->s_volume_name, 0, sizeof(sb->s_volume_name));
 761                 strncpy(sb->s_volume_name, new_label,
 762                         sizeof(sb->s_volume_name));
 763                 ext2fs_mark_super_dirty(fs);
 764         }
 765         if (M_flag) {
 766                 memset(sb->s_last_mounted, 0, sizeof(sb->s_last_mounted));
 767                 strncpy(sb->s_last_mounted, new_last_mounted,
 768                         sizeof(sb->s_last_mounted));
 769                 ext2fs_mark_super_dirty(fs);
 770         }
 771         if (features_cmd)
 772                 update_feature_set(fs, features_cmd);
 773         if (journal_size || journal_device)
 774                 add_journal(fs);
 775
 776         if (U_flag) {
 777                 if ((strcasecmp(new_UUID, "null") == 0) ||
 778                     (strcasecmp(new_UUID, "clear") == 0)) {
 779                         uuid_clear(sb->s_uuid);
 780                 } else if (strcasecmp(new_UUID, "time") == 0) {
 781                         uuid_generate_time(sb->s_uuid);
 782                 } else if (strcasecmp(new_UUID, "random") == 0) {
 783                         uuid_generate(sb->s_uuid);
 784                 } else if (uuid_parse(new_UUID, sb->s_uuid)) {
 785                         com_err(program_name, 0, _("Invalid UUID format\n"));
 786                         exit(1);
 787                 }
 788                 ext2fs_mark_super_dirty(fs);
 789         }
 790
 791         if (l_flag)
 792                 list_super (sb);
 793         ext2fs_close (fs);
 794         exit (0);
 795 }