e2fsprogs/tune2fs.c

   1 /*
   2  * tune2fs.c - Change the file system parameters on an ext2 file system
   3  *
   4  * Copyright (C) 1992, 1993, 1994  Remy Card <card@masi.ibp.fr>
   5  *                                 Laboratoire MASI, Institut Blaise Pascal
   6  *                                 Universite Pierre et Marie Curie (Paris VI)
   7  *
   8  * Copyright 1995, 1996, 1997, 1998, 1999, 2000 by Theodore Ts'o.
   9  *
  10  * %Begin-Header%
  11  * This file may be redistributed under the terms of the GNU Public
  12  * License.
  13  * %End-Header%
  14  */
  15
  16 /*
  17  * History:
  18  * 93/06/01     - Creation
  19  * 93/10/31     - Added the -c option to change the maximal mount counts
  20  * 93/12/14     - Added -l flag to list contents of superblock
  21  *                M.J.E. Mol (marcel@duteca.et.tudelft.nl)
  22  *                F.W. ten Wolde (franky@duteca.et.tudelft.nl)
  23  * 93/12/29     - Added the -e option to change errors behavior
  24  * 94/02/27     - Ported to use the ext2fs library
  25  * 94/03/06     - Added the checks interval from Uwe Ohse (uwe@tirka.gun.de)
  26  */
  27
  28 #include <fcntl.h>
  29 #include <grp.h>
  30 #ifdef HAVE_GETOPT_H
  31 #include <getopt.h>
  32 #else
  33 extern char *optarg;
  34 extern int optind;
  35 #endif
  36 #include <pwd.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <time.h>
  41 #include <unistd.h>
  42 #include <sys/types.h>
  43
  44 #include "e2fsbb.h"
  45 #include "ext2fs/ext2_fs.h"
  46 #include "ext2fs/ext2fs.h"
  47 #include "uuid/uuid.h"
  48 #include "e2p/e2p.h"
  49 #include "ext2fs/jfs_user.h"
  50 #include "util.h"
  51 #include "blkid/blkid.h"
  52
  53 static char * device_name = NULL;
  54 static char * new_label, *new_last_mounted, *new_UUID;
  55 static char * io_options;
  56 static int c_flag, C_flag, e_flag, f_flag, g_flag, i_flag, l_flag, L_flag;
  57 static int m_flag, M_flag, r_flag, s_flag = -1, u_flag, U_flag, T_flag;
  58 static time_t last_check_time;
  59 static int print_label;
  60 static int max_mount_count, mount_count, mount_flags;
  61 static unsigned long interval, reserved_ratio, reserved_blocks;
  62 static unsigned long resgid, resuid;
  63 static unsigned short errors;
  64 static int open_flag;
  65 static char *features_cmd;
  66 static char *mntopts_cmd;
  67
  68 static int journal_size, journal_flags;
  69 static char *journal_device = NULL;
  70
  71 static const char *please_fsck = "Please run e2fsck on the filesystem\n";
  72
  73 static __u32 ok_features[3] = {
  74         EXT3_FEATURE_COMPAT_HAS_JOURNAL | EXT2_FEATURE_COMPAT_DIR_INDEX,
  75         EXT2_FEATURE_INCOMPAT_FILETYPE,
  76         EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER
  77 };
  78
  79 /*
  80  * Remove an external journal from the filesystem
  81  */
  82 static void remove_journal_device(ext2_filsys fs)
  83 {
  84         char            *journal_path;
  85         ext2_filsys     jfs;
  86         char            buf[1024];
  87         journal_superblock_t    *jsb;
  88         int             i, nr_users;
  89         errcode_t       retval;
  90         int             commit_remove_journal = 0;
  91         io_manager      io_ptr;
  92
  93         if (f_flag)
  94                 commit_remove_journal = 1; /* force removal even if error */
  95
  96         uuid_unparse(fs->super->s_journal_uuid, buf);
  97         journal_path = blkid_get_devname(NULL, "UUID", buf);
  98
  99         if (!journal_path) {
 100                 journal_path =
 101                         ext2fs_find_block_device(fs->super->s_journal_dev);
 102                 if (!journal_path)
 103                         return;
 104         }
 105
 106         io_ptr = unix_io_manager;
 107         retval = ext2fs_open(journal_path, EXT2_FLAG_RW|
 108                              EXT2_FLAG_JOURNAL_DEV_OK, 0,
 109                              fs->blocksize, io_ptr, &jfs);
 110         if (retval) {
 111                 bb_error_msg("Failed to open external journal");
 112                 goto no_valid_journal;
 113         }
 114         if (!(jfs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
 115                 bb_error_msg("%s is not a journal device", journal_path);
 116                 goto no_valid_journal;
 117         }
 118
 119         /* Get the journal superblock */
 120         if ((retval = io_channel_read_blk(jfs->io, 1, -1024, buf))) {
 121                 bb_error_msg("Failed to read journal superblock");
 122                 goto no_valid_journal;
 123         }
 124
 125         jsb = (journal_superblock_t *) buf;
 126         if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) ||
 127             (jsb->s_header.h_blocktype != (unsigned) ntohl(JFS_SUPERBLOCK_V2))) {
 128                 bb_error_msg("Journal superblock not found!");
 129                 goto no_valid_journal;
 130         }
 131
 132         /* Find the filesystem UUID */
 133         nr_users = ntohl(jsb->s_nr_users);
 134         for (i=0; i < nr_users; i++) {
 135                 if (memcmp(fs->super->s_uuid,
 136                            &jsb->s_users[i*16], 16) == 0)
 137                         break;
 138         }
 139         if (i >= nr_users) {
 140                 bb_error_msg("Filesystem's UUID not found on journal device");
 141                 commit_remove_journal = 1;
 142                 goto no_valid_journal;
 143         }
 144         nr_users--;
 145         for (i=0; i < nr_users; i++)
 146                 memcpy(&jsb->s_users[i*16], &jsb->s_users[(i+1)*16], 16);
 147         jsb->s_nr_users = htonl(nr_users);
 148
 149         /* Write back the journal superblock */
 150         if ((retval = io_channel_write_blk(jfs->io, 1, -1024, buf))) {
 151                 bb_error_msg("Failed to write journal superblock");
 152                 goto no_valid_journal;
 153         }
 154
 155         commit_remove_journal = 1;
 156
 157 no_valid_journal:
 158         if (commit_remove_journal == 0)
 159                 bb_error_msg_and_die("Journal NOT removed");
 160         fs->super->s_journal_dev = 0;
 161         uuid_clear(fs->super->s_journal_uuid);
 162         ext2fs_mark_super_dirty(fs);
 163         puts("Journal removed");
 164         free(journal_path);
 165 }
 166
 167 /* Helper function for remove_journal_inode */
 168 static int release_blocks_proc(ext2_filsys fs, blk_t *blocknr,
 169                                int blockcnt EXT2FS_ATTR((unused)),
 170                                void *private EXT2FS_ATTR((unused)))
 171 {
 172         blk_t   block;
 173         int     group;
 174
 175         block = *blocknr;
 176         ext2fs_unmark_block_bitmap(fs->block_map,block);
 177         group = ext2fs_group_of_blk(fs, block);
 178         fs->group_desc[group].bg_free_blocks_count++;
 179         fs->super->s_free_blocks_count++;
 180         return 0;
 181 }
 182
 183 /*
 184  * Remove the journal inode from the filesystem
 185  */
 186 static void remove_journal_inode(ext2_filsys fs)
 187 {
 188         struct ext2_inode       inode;
 189         errcode_t               retval;
 190         ino_t                   ino = fs->super->s_journal_inum;
 191         char *msg = "to read";
 192         char *s = "journal inode";
 193
 194         retval = ext2fs_read_inode(fs, ino,  &inode);
 195         if (retval)
 196                 goto REMOVE_JOURNAL_INODE_ERROR;
 197         if (ino == EXT2_JOURNAL_INO) {
 198                 retval = ext2fs_read_bitmaps(fs);
 199                 if (retval) {
 200                         msg = "to read bitmaps";
 201                         s = "";
 202                         goto REMOVE_JOURNAL_INODE_ERROR;
 203                 }
 204                 retval = ext2fs_block_iterate(fs, ino, 0, NULL,
 205                                               release_blocks_proc, NULL);
 206                 if (retval) {
 207                         msg = "clearing";
 208                         goto REMOVE_JOURNAL_INODE_ERROR;
 209                 }
 210                 memset(&inode, 0, sizeof(inode));
 211                 ext2fs_mark_bb_dirty(fs);
 212                 fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
 213         } else
 214                 inode.i_flags &= ~EXT2_IMMUTABLE_FL;
 215         retval = ext2fs_write_inode(fs, ino, &inode);
 216         if (retval) {
 217                 msg = "writing";
 218 REMOVE_JOURNAL_INODE_ERROR:
 219                 bb_error_msg_and_die("Failed %s %s", msg, s);
 220         }
 221         fs->super->s_journal_inum = 0;
 222         ext2fs_mark_super_dirty(fs);
 223 }
 224
 225 /*
 226  * Update the default mount options
 227  */
 228 static void update_mntopts(ext2_filsys fs, char *mntopts)
 229 {
 230         struct ext2_super_block *sb= fs->super;
 231
 232         if (e2p_edit_mntopts(mntopts, &sb->s_default_mount_opts, ~0))
 233                 bb_error_msg_and_die("Invalid mount option set: %s", mntopts);
 234         ext2fs_mark_super_dirty(fs);
 235 }
 236
 237 /*
 238  * Update the feature set as provided by the user.
 239  */
 240 static void update_feature_set(ext2_filsys fs, char *features)
 241 {
 242         int sparse, old_sparse, filetype, old_filetype;
 243         int journal, old_journal, dxdir, old_dxdir;
 244         struct ext2_super_block *sb= fs->super;
 245         __u32   old_compat, old_incompat, old_ro_compat;
 246
 247         old_compat = sb->s_feature_compat;
 248         old_ro_compat = sb->s_feature_ro_compat;
 249         old_incompat = sb->s_feature_incompat;
 250
 251         old_sparse = sb->s_feature_ro_compat &
 252                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 253         old_filetype = sb->s_feature_incompat &
 254                 EXT2_FEATURE_INCOMPAT_FILETYPE;
 255         old_journal = sb->s_feature_compat &
 256                 EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 257         old_dxdir = sb->s_feature_compat &
 258                 EXT2_FEATURE_COMPAT_DIR_INDEX;
 259         if (e2p_edit_feature(features, &sb->s_feature_compat, ok_features))
 260                 bb_error_msg_and_die("Invalid filesystem option set: %s", features);
 261         sparse = sb->s_feature_ro_compat &
 262                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 263         filetype = sb->s_feature_incompat &
 264                 EXT2_FEATURE_INCOMPAT_FILETYPE;
 265         journal = sb->s_feature_compat &
 266                 EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 267         dxdir = sb->s_feature_compat &
 268                 EXT2_FEATURE_COMPAT_DIR_INDEX;
 269         if (old_journal && !journal) {
 270                 if ((mount_flags & EXT2_MF_MOUNTED) &&
 271                     !(mount_flags & EXT2_MF_READONLY)) {
 272                         bb_error_msg_and_die(
 273                                 "The has_journal flag may only be "
 274                                 "cleared when the filesystem is\n"
 275                                 "unmounted or mounted "
 276                                 "read-only");
 277                 }
 278                 if (sb->s_feature_incompat &
 279                     EXT3_FEATURE_INCOMPAT_RECOVER) {
 280                         bb_error_msg_and_die(
 281                                 "The needs_recovery flag is set.  "
 282                                 "%s before clearing the has_journal flag.",
 283                                 please_fsck);
 284                 }
 285                 if (sb->s_journal_inum) {
 286                         remove_journal_inode(fs);
 287                 }
 288                 if (sb->s_journal_dev) {
 289                         remove_journal_device(fs);
 290                 }
 291         }
 292         if (journal && !old_journal) {
 293                 /*
 294                  * If adding a journal flag, let the create journal
 295                  * code below handle creating setting the flag and
 296                  * creating the journal.  We supply a default size if
 297                  * necessary.
 298                  */
 299                 if (!journal_size)
 300                         journal_size = -1;
 301                 sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 302         }
 303         if (dxdir && !old_dxdir) {
 304                 if (!sb->s_def_hash_version)
 305                         sb->s_def_hash_version = EXT2_HASH_TEA;
 306                 if (uuid_is_null((unsigned char *) sb->s_hash_seed))
 307                         uuid_generate((unsigned char *) sb->s_hash_seed);
 308         }
 309
 310         if (sb->s_rev_level == EXT2_GOOD_OLD_REV &&
 311             (sb->s_feature_compat || sb->s_feature_ro_compat ||
 312              sb->s_feature_incompat))
 313                 ext2fs_update_dynamic_rev(fs);
 314         if ((sparse != old_sparse) ||
 315             (filetype != old_filetype)) {
 316                 sb->s_state &= ~EXT2_VALID_FS;
 317                 printf("\n%s\n", please_fsck);
 318         }
 319         if ((old_compat != sb->s_feature_compat) ||
 320             (old_ro_compat != sb->s_feature_ro_compat) ||
 321             (old_incompat != sb->s_feature_incompat))
 322                 ext2fs_mark_super_dirty(fs);
 323 }
 324
 325 /*
 326  * Add a journal to the filesystem.
 327  */
 328 static void add_journal(ext2_filsys fs)
 329 {
 330         if (fs->super->s_feature_compat &
 331             EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
 332                 bb_error_msg_and_die("The filesystem already has a journal");
 333         }
 334         if (journal_device) {
 335                 make_journal_device(journal_device, fs, 0, 0);
 336         } else if (journal_size) {
 337                 make_journal_blocks(fs, journal_size, journal_flags, 0);
 338                 /*
 339                  * If the filesystem wasn't mounted, we need to force
 340                  * the block group descriptors out.
 341                  */
 342                 if ((mount_flags & EXT2_MF_MOUNTED) == 0)
 343                         fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
 344         }
 345         print_check_message(fs);
 346         return;
 347 }
 348
 349 /*
 350  * Busybox stuff
 351  */
 352 static char * x_blkid_get_devname(const char *token)
 353 {
 354         char * dev_name;
 355
 356         if (!(dev_name = blkid_get_devname(NULL, token, NULL)))
 357                 bb_error_msg_and_die("Unable to resolve '%s'", token);
 358         return dev_name;
 359 }
 360
 361 #ifdef CONFIG_E2LABEL
 362 static void parse_e2label_options(int argc, char ** argv)
 363 {
 364         if ((argc < 2) || (argc > 3))
 365                 bb_show_usage();
 366         io_options = strchr(argv[1], '?');
 367         if (io_options)
 368                 *io_options++ = 0;
 369         device_name = x_blkid_get_devname(argv[1]);
 370         if (argc == 3) {
 371                 open_flag = EXT2_FLAG_RW | EXT2_FLAG_JOURNAL_DEV_OK;
 372                 L_flag = 1;
 373                 new_label = argv[2];
 374         } else
 375                 print_label++;
 376 }
 377 #else
 378 #define parse_e2label_options(x,y)
 379 #endif
 380
 381 static time_t parse_time(char *str)
 382 {
 383         struct  tm      ts;
 384
 385         if (strcmp(str, "now") == 0) {
 386                 return (time(0));
 387         }
 388         memset(&ts, 0, sizeof(ts));
 389 #ifdef HAVE_STRPTIME
 390         strptime(str, "%Y%m%d%H%M%S", &ts);
 391 #else
 392         sscanf(str, "%4d%2d%2d%2d%2d%2d", &ts.tm_year, &ts.tm_mon,
 393                &ts.tm_mday, &ts.tm_hour, &ts.tm_min, &ts.tm_sec);
 394         ts.tm_year -= 1900;
 395         ts.tm_mon -= 1;
 396         if (ts.tm_year < 0 || ts.tm_mon < 0 || ts.tm_mon > 11 ||
 397             ts.tm_mday < 0 || ts.tm_mday > 31 || ts.tm_hour > 23 ||
 398             ts.tm_min > 59 || ts.tm_sec > 61)
 399                 ts.tm_mday = 0;
 400 #endif
 401         if (ts.tm_mday == 0) {
 402                 bb_error_msg_and_die("Couldn't parse date/time specifier: %s", str);
 403         }
 404         return (mktime(&ts));
 405 }
 406
 407 static void parse_tune2fs_options(int argc, char **argv)
 408 {
 409         int c;
 410         char * tmp;
 411
 412         printf("tune2fs %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
 413         while ((c = getopt(argc, argv, "c:e:fg:i:jlm:o:r:s:u:C:J:L:M:O:T:U:")) != EOF)
 414                 switch (c)
 415                 {
 416                         case 'c':
 417                                 if (safe_strtoi(optarg, &max_mount_count) ||  max_mount_count > 16000) {
 418                                         goto MOUNTS_COUNT_ERROR;
 419                                 }
 420                                 if (max_mount_count == 0)
 421                                         max_mount_count = -1;
 422                                 c_flag = 1;
 423                                 open_flag = EXT2_FLAG_RW;
 424                                 break;
 425                         case 'C':
 426                                 if (safe_strtoi(optarg, &mount_count) || mount_count > 16000) {
 427 MOUNTS_COUNT_ERROR:
 428                                         bb_error_msg_and_die("bad mounts count - %s", optarg);
 429                                 }
 430                                 C_flag = 1;
 431                                 open_flag = EXT2_FLAG_RW;
 432                                 break;
 433                         case 'e':
 434                                 if (strcmp (optarg, "continue") == 0)
 435                                         errors = EXT2_ERRORS_CONTINUE;
 436                                 else if (strcmp (optarg, "remount-ro") == 0)
 437                                         errors = EXT2_ERRORS_RO;
 438                                 else if (strcmp (optarg, "panic") == 0)
 439                                         errors = EXT2_ERRORS_PANIC;
 440                                 else {
 441                                         bb_error_msg_and_die("bad error behavior - %s", optarg);
 442                                 }
 443                                 e_flag = 1;
 444                                 open_flag = EXT2_FLAG_RW;
 445                                 break;
 446                         case 'f': /* Force */
 447                                 f_flag = 1;
 448                                 break;
 449                         case 'g':
 450                                 if (safe_strtoul(optarg, &resgid))
 451                                         resgid = bb_xgetgrnam(optarg);
 452                                 g_flag = 1;
 453                                 open_flag = EXT2_FLAG_RW;
 454                                 break;
 455                         case 'i':
 456                                 interval = strtoul (optarg, &tmp, 0);
 457                                 switch (*tmp) {
 458                                 case 's':
 459                                         tmp++;
 460                                         break;
 461                                 case '\0':
 462                                 case 'd':
 463                                 case 'D': /* days */
 464                                         interval *= 86400;
 465                                         if (*tmp != '\0')
 466                                                 tmp++;
 467                                         break;
 468                                 case 'm':
 469                                 case 'M': /* months! */
 470                                         interval *= 86400 * 30;
 471                                         tmp++;
 472                                         break;
 473                                 case 'w':
 474                                 case 'W': /* weeks */
 475                                         interval *= 86400 * 7;
 476                                         tmp++;
 477                                         break;
 478                                 }
 479                                 if (*tmp || interval > (365 * 86400)) {
 480                                         bb_error_msg_and_die("bad interval - %s", optarg);
 481                                 }
 482                                 i_flag = 1;
 483                                 open_flag = EXT2_FLAG_RW;
 484                                 break;
 485                         case 'j':
 486                                 if (!journal_size)
 487                                         journal_size = -1;
 488                                 open_flag = EXT2_FLAG_RW;
 489                                 break;
 490                         case 'J':
 491                                 parse_journal_opts(&journal_device, &journal_flags, &journal_size, optarg);
 492                                 open_flag = EXT2_FLAG_RW;
 493                                 break;
 494                         case 'l':
 495                                 l_flag = 1;
 496                                 break;
 497                         case 'L':
 498                                 new_label = optarg;
 499                                 L_flag = 1;
 500                                 open_flag = EXT2_FLAG_RW |
 501                                         EXT2_FLAG_JOURNAL_DEV_OK;
 502                                 break;
 503                         case 'm':
 504                                 if(safe_strtoul(optarg, &reserved_ratio) || reserved_ratio > 50) {
 505                                         bb_error_msg_and_die("bad reserved block ratio - %s", optarg);
 506                                 }
 507                                 m_flag = 1;
 508                                 open_flag = EXT2_FLAG_RW;
 509                                 break;
 510                         case 'M':
 511                                 new_last_mounted = optarg;
 512                                 M_flag = 1;
 513                                 open_flag = EXT2_FLAG_RW;
 514                                 break;
 515                         case 'o':
 516                                 if (mntopts_cmd) {
 517                                         bb_error_msg_and_die("-o may only be specified once");
 518                                 }
 519                                 mntopts_cmd = optarg;
 520                                 open_flag = EXT2_FLAG_RW;
 521                                 break;
 522
 523                         case 'O':
 524                                 if (features_cmd) {
 525                                         bb_error_msg_and_die("-O may only be specified once");
 526                                 }
 527                                 features_cmd = optarg;
 528                                 open_flag = EXT2_FLAG_RW;
 529                                 break;
 530                         case 'r':
 531                                 if(safe_strtoul(optarg, &reserved_blocks)) {
 532                                         bb_error_msg_and_die("bad reserved blocks count - %s", optarg);
 533                                 }
 534                                 r_flag = 1;
 535                                 open_flag = EXT2_FLAG_RW;
 536                                 break;
 537                         case 's':
 538                                 s_flag = atoi(optarg);
 539                                 open_flag = EXT2_FLAG_RW;
 540                                 break;
 541                         case 'T':
 542                                 T_flag = 1;
 543                                 last_check_time = parse_time(optarg);
 544                                 open_flag = EXT2_FLAG_RW;
 545                                 break;
 546                         case 'u':
 547                                 if (safe_strtoul(optarg, &resuid))
 548                                         resuid = bb_xgetpwnam(optarg);
 549                                 u_flag = 1;
 550                                 open_flag = EXT2_FLAG_RW;
 551                                 break;
 552                         case 'U':
 553                                 new_UUID = optarg;
 554                                 U_flag = 1;
 555                                 open_flag = EXT2_FLAG_RW |
 556                                         EXT2_FLAG_JOURNAL_DEV_OK;
 557                                 break;
 558                         default:
 559                                 bb_show_usage();
 560                 }
 561         if (optind < argc - 1 || optind == argc)
 562                 bb_show_usage();
 563         if (!open_flag && !l_flag)
 564                 bb_show_usage();
 565         io_options = strchr(argv[optind], '?');
 566         if (io_options)
 567                 *io_options++ = 0;
 568         device_name = x_blkid_get_devname(argv[optind]);
 569 }
 570
 571 #ifdef CONFIG_FINDFS
 572 static attribute_noreturn void do_findfs(int argc, char **argv)
 573 {
 574         if ((argc != 2) ||
 575             (strncmp(argv[1], "LABEL=", 6) && strncmp(argv[1], "UUID=", 5)))
 576                 bb_show_usage();
 577         device_name = x_blkid_get_devname(argv[1]);
 578         puts(device_name);
 579         exit(0);
 580 }
 581 #else
 582 #define do_findfs(x, y)
 583 #endif
 584
 585 static void clean_up(void)
 586 {
 587         if (ENABLE_FEATURE_CLEAN_UP && device_name) free(device_name);
 588         if (ENABLE_FEATURE_CLEAN_UP && journal_device) free(journal_device);
 589 }
 590
 591 int tune2fs_main(int argc, char **argv)
 592 {
 593         errcode_t retval;
 594         ext2_filsys fs;
 595         struct ext2_super_block *sb;
 596         io_manager io_ptr;
 597
 598         if (ENABLE_FEATURE_CLEAN_UP)
 599                 atexit(clean_up);
 600
 601         if (ENABLE_FINDFS && (bb_applet_name[0] == 'f')) /* findfs */
 602                 do_findfs(argc, argv);  /* no return */
 603         else if (ENABLE_E2LABEL && (bb_applet_name[0] == 'e')) /* e2label */
 604                 parse_e2label_options(argc, argv);
 605         else
 606                 parse_tune2fs_options(argc, argv);  /* tune2fs */
 607
 608         io_ptr = unix_io_manager;
 609         retval = ext2fs_open2(device_name, io_options, open_flag,
 610                               0, 0, io_ptr, &fs);
 611         if (retval)
 612                 bb_error_msg_and_die("No valid superblock on %s", device_name);
 613         sb = fs->super;
 614         if (print_label) {
 615                 /* For e2label emulation */
 616                 printf("%.*s\n", (int) sizeof(sb->s_volume_name),
 617                        sb->s_volume_name);
 618                 return 0;
 619         }
 620         retval = ext2fs_check_if_mounted(device_name, &mount_flags);
 621         if (retval)
 622                 bb_error_msg_and_die("Could not determine if %s is mounted", device_name);
 623         /* Normally we only need to write out the superblock */
 624         fs->flags |= EXT2_FLAG_SUPER_ONLY;
 625
 626         if (c_flag) {
 627                 sb->s_max_mnt_count = max_mount_count;
 628                 ext2fs_mark_super_dirty(fs);
 629                 printf("Setting maximal mount count to %d\n", max_mount_count);
 630         }
 631         if (C_flag) {
 632                 sb->s_mnt_count = mount_count;
 633                 ext2fs_mark_super_dirty(fs);
 634                 printf("Setting current mount count to %d\n", mount_count);
 635         }
 636         if (e_flag) {
 637                 sb->s_errors = errors;
 638                 ext2fs_mark_super_dirty(fs);
 639                 printf("Setting error behavior to %d\n", errors);
 640         }
 641         if (g_flag) {
 642                 sb->s_def_resgid = resgid;
 643                 ext2fs_mark_super_dirty(fs);
 644                 printf("Setting reserved blocks gid to %lu\n", resgid);
 645         }
 646         if (i_flag) {
 647                 sb->s_checkinterval = interval;
 648                 ext2fs_mark_super_dirty(fs);
 649                 printf("Setting interval between check %lu seconds\n", interval);
 650         }
 651         if (m_flag) {
 652                 sb->s_r_blocks_count = (sb->s_blocks_count / 100)
 653                         * reserved_ratio;
 654                 ext2fs_mark_super_dirty(fs);
 655                 printf("Setting reserved blocks percentage to %lu (%u blocks)\n",
 656                         reserved_ratio, sb->s_r_blocks_count);
 657         }
 658         if (r_flag) {
 659                 if (reserved_blocks >= sb->s_blocks_count/2)
 660                         bb_error_msg_and_die("reserved blocks count is too big (%lu)", reserved_blocks);
 661                 sb->s_r_blocks_count = reserved_blocks;
 662                 ext2fs_mark_super_dirty(fs);
 663                 printf("Setting reserved blocks count to %lu\n", reserved_blocks);
 664         }
 665         if (s_flag == 1) {
 666                 if (sb->s_feature_ro_compat &
 667                     EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)
 668                         bb_error_msg("\nThe filesystem already has sparse superblocks\n");
 669                 else {
 670                         sb->s_feature_ro_compat |=
 671                                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 672                         sb->s_state &= ~EXT2_VALID_FS;
 673                         ext2fs_mark_super_dirty(fs);
 674                         printf("\nSparse superblock flag set.  %s", please_fsck);
 675                 }
 676         }
 677         if (s_flag == 0) {
 678                 if (!(sb->s_feature_ro_compat &
 679                       EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER))
 680                         bb_error_msg("\nThe filesystem already has sparse superblocks disabled\n");
 681                 else {
 682                         sb->s_feature_ro_compat &=
 683                                 ~EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 684                         sb->s_state &= ~EXT2_VALID_FS;
 685                         fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
 686                         ext2fs_mark_super_dirty(fs);
 687                         printf("\nSparse superblock flag cleared.  %s", please_fsck);
 688                 }
 689         }
 690         if (T_flag) {
 691                 sb->s_lastcheck = last_check_time;
 692                 ext2fs_mark_super_dirty(fs);
 693                 printf("Setting time filesystem last checked to %s\n",
 694                        ctime(&last_check_time));
 695         }
 696         if (u_flag) {
 697                 sb->s_def_resuid = resuid;
 698                 ext2fs_mark_super_dirty(fs);
 699                 printf("Setting reserved blocks uid to %lu\n", resuid);
 700         }
 701         if (L_flag) {
 702                 if (strlen(new_label) > sizeof(sb->s_volume_name))
 703                         bb_error_msg("Warning: label too long, truncating\n");
 704                 memset(sb->s_volume_name, 0, sizeof(sb->s_volume_name));
 705                 strncpy(sb->s_volume_name, new_label,
 706                         sizeof(sb->s_volume_name));
 707                 ext2fs_mark_super_dirty(fs);
 708         }
 709         if (M_flag) {
 710                 memset(sb->s_last_mounted, 0, sizeof(sb->s_last_mounted));
 711                 strncpy(sb->s_last_mounted, new_last_mounted,
 712                         sizeof(sb->s_last_mounted));
 713                 ext2fs_mark_super_dirty(fs);
 714         }
 715         if (mntopts_cmd)
 716                 update_mntopts(fs, mntopts_cmd);
 717         if (features_cmd)
 718                 update_feature_set(fs, features_cmd);
 719         if (journal_size || journal_device)
 720                 add_journal(fs);
 721
 722         if (U_flag) {
 723                 if ((strcasecmp(new_UUID, "null") == 0) ||
 724                     (strcasecmp(new_UUID, "clear") == 0)) {
 725                         uuid_clear(sb->s_uuid);
 726                 } else if (strcasecmp(new_UUID, "time") == 0) {
 727                         uuid_generate_time(sb->s_uuid);
 728                 } else if (strcasecmp(new_UUID, "random") == 0) {
 729                         uuid_generate(sb->s_uuid);
 730                 } else if (uuid_parse(new_UUID, sb->s_uuid)) {
 731                         bb_error_msg_and_die("Invalid UUID format");
 732                 }
 733                 ext2fs_mark_super_dirty(fs);
 734         }
 735
 736         if (l_flag)
 737                 list_super (sb);
 738         return (ext2fs_close (fs) ? 1 : 0);
 739 }