e2fsprogs/tune2fs.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * tune2fs.c - Change the file system parameters on an ext2 file system
   4  *
   5  * Copyright (C) 1992, 1993, 1994  Remy Card <card@masi.ibp.fr>
   6  *                                 Laboratoire MASI, Institut Blaise Pascal
   7  *                                 Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  * Copyright 1995, 1996, 1997, 1998, 1999, 2000 by Theodore Ts'o.
  10  *
  11  * %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 <sys/types.h>
  30 #include <fcntl.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <time.h>
  35 #include <unistd.h>
  36 #include <getopt.h>
  37
  38 #include "e2fsbb.h"
  39 #include "ext2fs/ext2_fs.h"
  40 #include "ext2fs/ext2fs.h"
  41 #include "uuid/uuid.h"
  42 #include "e2p/e2p.h"
  43 #include "ext2fs/kernel-jbd.h"
  44 #include "util.h"
  45 #include "blkid/blkid.h"
  46
  47 #include "busybox.h"
  48 #include "grp_.h"
  49 #include "pwd_.h"
  50
  51 static char * device_name = NULL;
  52 static char * new_label, *new_last_mounted, *new_UUID;
  53 static char * io_options;
  54 static int c_flag, C_flag, e_flag, f_flag, g_flag, i_flag, l_flag, L_flag;
  55 static int m_flag, M_flag, r_flag, s_flag = -1, u_flag, U_flag, T_flag;
  56 static time_t last_check_time;
  57 static int print_label;
  58 static int max_mount_count, mount_count, mount_flags;
  59 static unsigned long interval, reserved_ratio, reserved_blocks;
  60 static unsigned long resgid, resuid;
  61 static unsigned short errors;
  62 static int open_flag;
  63 static char *features_cmd;
  64 static char *mntopts_cmd;
  65
  66 static int journal_size, journal_flags;
  67 static char *journal_device = NULL;
  68
  69 static const char *please_fsck = "Please run e2fsck on the filesystem\n";
  70
  71 static __u32 ok_features[3] = {
  72         EXT3_FEATURE_COMPAT_HAS_JOURNAL | EXT2_FEATURE_COMPAT_DIR_INDEX,
  73         EXT2_FEATURE_INCOMPAT_FILETYPE,
  74         EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER
  75 };
  76
  77 /*
  78  * Remove an external journal from the filesystem
  79  */
  80 static void remove_journal_device(ext2_filsys fs)
  81 {
  82         char            *journal_path;
  83         ext2_filsys     jfs;
  84         char            buf[1024];
  85         journal_superblock_t    *jsb;
  86         int             i, nr_users;
  87         errcode_t       retval;
  88         int             commit_remove_journal = 0;
  89         io_manager      io_ptr;
  90
  91         if (f_flag)
  92                 commit_remove_journal = 1; /* force removal even if error */
  93
  94         uuid_unparse(fs->super->s_journal_uuid, buf);
  95         journal_path = blkid_get_devname(NULL, "UUID", buf);
  96
  97         if (!journal_path) {
  98                 journal_path =
  99                         ext2fs_find_block_device(fs->super->s_journal_dev);
 100                 if (!journal_path)
 101                         return;
 102         }
 103
 104         io_ptr = unix_io_manager;
 105         retval = ext2fs_open(journal_path, EXT2_FLAG_RW|
 106                              EXT2_FLAG_JOURNAL_DEV_OK, 0,
 107                              fs->blocksize, io_ptr, &jfs);
 108         if (retval) {
 109                 bb_error_msg("Failed to open external journal");
 110                 goto no_valid_journal;
 111         }
 112         if (!(jfs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
 113                 bb_error_msg("%s is not a journal device", journal_path);
 114                 goto no_valid_journal;
 115         }
 116
 117         /* Get the journal superblock */
 118         if ((retval = io_channel_read_blk(jfs->io, 1, -1024, buf))) {
 119                 bb_error_msg("Failed to read journal superblock");
 120                 goto no_valid_journal;
 121         }
 122
 123         jsb = (journal_superblock_t *) buf;
 124         if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) ||
 125             (jsb->s_header.h_blocktype != (unsigned) ntohl(JFS_SUPERBLOCK_V2))) {
 126                 bb_error_msg("Journal superblock not found!");
 127                 goto no_valid_journal;
 128         }
 129
 130         /* Find the filesystem UUID */
 131         nr_users = ntohl(jsb->s_nr_users);
 132         for (i=0; i < nr_users; i++) {
 133                 if (memcmp(fs->super->s_uuid,
 134                            &jsb->s_users[i*16], 16) == 0)
 135                         break;
 136         }
 137         if (i >= nr_users) {
 138                 bb_error_msg("Filesystem's UUID not found on journal device");
 139                 commit_remove_journal = 1;
 140                 goto no_valid_journal;
 141         }
 142         nr_users--;
 143         for (i=0; i < nr_users; i++)
 144                 memcpy(&jsb->s_users[i*16], &jsb->s_users[(i+1)*16], 16);
 145         jsb->s_nr_users = htonl(nr_users);
 146
 147         /* Write back the journal superblock */
 148         if ((retval = io_channel_write_blk(jfs->io, 1, -1024, buf))) {
 149                 bb_error_msg("Failed to write journal superblock");
 150                 goto no_valid_journal;
 151         }
 152
 153         commit_remove_journal = 1;
 154
 155 no_valid_journal:
 156         if (commit_remove_journal == 0)
 157                 bb_error_msg_and_die("Journal NOT removed");
 158         fs->super->s_journal_dev = 0;
 159         uuid_clear(fs->super->s_journal_uuid);
 160         ext2fs_mark_super_dirty(fs);
 161         puts("Journal removed");
 162         free(journal_path);
 163 }
 164
 165 /* Helper function for remove_journal_inode */
 166 static int release_blocks_proc(ext2_filsys fs, blk_t *blocknr,
 167                                int blockcnt EXT2FS_ATTR((unused)),
 168                                void *private EXT2FS_ATTR((unused)))
 169 {
 170         blk_t   block;
 171         int     group;
 172
 173         block = *blocknr;
 174         ext2fs_unmark_block_bitmap(fs->block_map,block);
 175         group = ext2fs_group_of_blk(fs, block);
 176         fs->group_desc[group].bg_free_blocks_count++;
 177         fs->super->s_free_blocks_count++;
 178         return 0;
 179 }
 180
 181 /*
 182  * Remove the journal inode from the filesystem
 183  */
 184 static void remove_journal_inode(ext2_filsys fs)
 185 {
 186         struct ext2_inode       inode;
 187         errcode_t               retval;
 188         ino_t                   ino = fs->super->s_journal_inum;
 189         char *msg = "to read";
 190         char *s = "journal inode";
 191
 192         retval = ext2fs_read_inode(fs, ino,  &inode);
 193         if (retval)
 194                 goto REMOVE_JOURNAL_INODE_ERROR;
 195         if (ino == EXT2_JOURNAL_INO) {
 196                 retval = ext2fs_read_bitmaps(fs);
 197                 if (retval) {
 198                         msg = "to read bitmaps";
 199                         s = "";
 200                         goto REMOVE_JOURNAL_INODE_ERROR;
 201                 }
 202                 retval = ext2fs_block_iterate(fs, ino, 0, NULL,
 203                                               release_blocks_proc, NULL);
 204                 if (retval) {
 205                         msg = "clearing";
 206                         goto REMOVE_JOURNAL_INODE_ERROR;
 207                 }
 208                 memset(&inode, 0, sizeof(inode));
 209                 ext2fs_mark_bb_dirty(fs);
 210                 fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
 211         } else
 212                 inode.i_flags &= ~EXT2_IMMUTABLE_FL;
 213         retval = ext2fs_write_inode(fs, ino, &inode);
 214         if (retval) {
 215                 msg = "writing";
 216 REMOVE_JOURNAL_INODE_ERROR:
 217                 bb_error_msg_and_die("Failed %s %s", msg, s);
 218         }
 219         fs->super->s_journal_inum = 0;
 220         ext2fs_mark_super_dirty(fs);
 221 }
 222
 223 /*
 224  * Update the default mount options
 225  */
 226 static void update_mntopts(ext2_filsys fs, char *mntopts)
 227 {
 228         struct ext2_super_block *sb= fs->super;
 229
 230         if (e2p_edit_mntopts(mntopts, &sb->s_default_mount_opts, ~0))
 231                 bb_error_msg_and_die("Invalid mount option set: %s", mntopts);
 232         ext2fs_mark_super_dirty(fs);
 233 }
 234
 235 /*
 236  * Update the feature set as provided by the user.
 237  */
 238 static void update_feature_set(ext2_filsys fs, char *features)
 239 {
 240         int sparse, old_sparse, filetype, old_filetype;
 241         int journal, old_journal, dxdir, old_dxdir;
 242         struct ext2_super_block *sb= fs->super;
 243         __u32   old_compat, old_incompat, old_ro_compat;
 244
 245         old_compat = sb->s_feature_compat;
 246         old_ro_compat = sb->s_feature_ro_compat;
 247         old_incompat = sb->s_feature_incompat;
 248
 249         old_sparse = sb->s_feature_ro_compat &
 250                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 251         old_filetype = sb->s_feature_incompat &
 252                 EXT2_FEATURE_INCOMPAT_FILETYPE;
 253         old_journal = sb->s_feature_compat &
 254                 EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 255         old_dxdir = sb->s_feature_compat &
 256                 EXT2_FEATURE_COMPAT_DIR_INDEX;
 257         if (e2p_edit_feature(features, &sb->s_feature_compat, ok_features))
 258                 bb_error_msg_and_die("Invalid filesystem option set: %s", features);
 259         sparse = sb->s_feature_ro_compat &
 260                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 261         filetype = sb->s_feature_incompat &
 262                 EXT2_FEATURE_INCOMPAT_FILETYPE;
 263         journal = sb->s_feature_compat &
 264                 EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 265         dxdir = sb->s_feature_compat &
 266                 EXT2_FEATURE_COMPAT_DIR_INDEX;
 267         if (old_journal && !journal) {
 268                 if ((mount_flags & EXT2_MF_MOUNTED) &&
 269                     !(mount_flags & EXT2_MF_READONLY)) {
 270                         bb_error_msg_and_die(
 271                                 "The has_journal flag may only be "
 272                                 "cleared when the filesystem is\n"
 273                                 "unmounted or mounted "
 274                                 "read-only");
 275                 }
 276                 if (sb->s_feature_incompat &
 277                     EXT3_FEATURE_INCOMPAT_RECOVER) {
 278                         bb_error_msg_and_die(
 279                                 "The needs_recovery flag is set.  "
 280                                 "%s before clearing the has_journal flag.",
 281                                 please_fsck);
 282                 }
 283                 if (sb->s_journal_inum) {
 284                         remove_journal_inode(fs);
 285                 }
 286                 if (sb->s_journal_dev) {
 287                         remove_journal_device(fs);
 288                 }
 289         }
 290         if (journal && !old_journal) {
 291                 /*
 292                  * If adding a journal flag, let the create journal
 293                  * code below handle creating setting the flag and
 294                  * creating the journal.  We supply a default size if
 295                  * necessary.
 296                  */
 297                 if (!journal_size)
 298                         journal_size = -1;
 299                 sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
 300         }
 301         if (dxdir && !old_dxdir) {
 302                 if (!sb->s_def_hash_version)
 303                         sb->s_def_hash_version = EXT2_HASH_TEA;
 304                 if (uuid_is_null((unsigned char *) sb->s_hash_seed))
 305                         uuid_generate((unsigned char *) sb->s_hash_seed);
 306         }
 307
 308         if (sb->s_rev_level == EXT2_GOOD_OLD_REV &&
 309             (sb->s_feature_compat || sb->s_feature_ro_compat ||
 310              sb->s_feature_incompat))
 311                 ext2fs_update_dynamic_rev(fs);
 312         if ((sparse != old_sparse) ||
 313             (filetype != old_filetype)) {
 314                 sb->s_state &= ~EXT2_VALID_FS;
 315                 printf("\n%s\n", please_fsck);
 316         }
 317         if ((old_compat != sb->s_feature_compat) ||
 318             (old_ro_compat != sb->s_feature_ro_compat) ||
 319             (old_incompat != sb->s_feature_incompat))
 320                 ext2fs_mark_super_dirty(fs);
 321 }
 322
 323 /*
 324  * Add a journal to the filesystem.
 325  */
 326 static void add_journal(ext2_filsys fs)
 327 {
 328         if (fs->super->s_feature_compat &
 329             EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
 330                 bb_error_msg_and_die("The filesystem already has a journal");
 331         }
 332         if (journal_device) {
 333                 make_journal_device(journal_device, fs, 0, 0);
 334         } else if (journal_size) {
 335                 make_journal_blocks(fs, journal_size, journal_flags, 0);
 336                 /*
 337                  * If the filesystem wasn't mounted, we need to force
 338                  * the block group descriptors out.
 339                  */
 340                 if ((mount_flags & EXT2_MF_MOUNTED) == 0)
 341                         fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
 342         }
 343         print_check_message(fs);
 344         return;
 345 }
 346
 347 /*
 348  * Busybox stuff
 349  */
 350 static char * x_blkid_get_devname(const char *token)
 351 {
 352         char * dev_name;
 353
 354         if (!(dev_name = blkid_get_devname(NULL, token, NULL)))
 355                 bb_error_msg_and_die("Unable to resolve '%s'", token);
 356         return dev_name;
 357 }
 358
 359 #ifdef CONFIG_E2LABEL
 360 static void parse_e2label_options(int argc, char ** argv)
 361 {
 362         if ((argc < 2) || (argc > 3))
 363                 bb_show_usage();
 364         io_options = strchr(argv[1], '?');
 365         if (io_options)
 366                 *io_options++ = 0;
 367         device_name = x_blkid_get_devname(argv[1]);
 368         if (argc == 3) {
 369                 open_flag = EXT2_FLAG_RW | EXT2_FLAG_JOURNAL_DEV_OK;
 370                 L_flag = 1;
 371                 new_label = argv[2];
 372         } else
 373                 print_label++;
 374 }
 375 #else
 376 #define parse_e2label_options(x,y)
 377 #endif
 378
 379 static time_t parse_time(char *str)
 380 {
 381         struct  tm      ts;
 382
 383         if (strcmp(str, "now") == 0) {
 384                 return (time(0));
 385         }
 386         memset(&ts, 0, sizeof(ts));
 387 #ifdef HAVE_STRPTIME
 388         strptime(str, "%Y%m%d%H%M%S", &ts);
 389 #else
 390         sscanf(str, "%4d%2d%2d%2d%2d%2d", &ts.tm_year, &ts.tm_mon,
 391                &ts.tm_mday, &ts.tm_hour, &ts.tm_min, &ts.tm_sec);
 392         ts.tm_year -= 1900;
 393         ts.tm_mon -= 1;
 394         if (ts.tm_year < 0 || ts.tm_mon < 0 || ts.tm_mon > 11 ||
 395             ts.tm_mday < 0 || ts.tm_mday > 31 || ts.tm_hour > 23 ||
 396             ts.tm_min > 59 || ts.tm_sec > 61)
 397                 ts.tm_mday = 0;
 398 #endif
 399         if (ts.tm_mday == 0) {
 400                 bb_error_msg_and_die("Couldn't parse date/time specifier: %s", str);
 401         }
 402         return (mktime(&ts));
 403 }
 404
 405 static void parse_tune2fs_options(int argc, char **argv)
 406 {
 407         int c;
 408         char * tmp;
 409
 410         printf("tune2fs %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
 411         while ((c = getopt(argc, argv, "c:e:fg:i:jlm:o:r:s:u:C:J:L:M:O:T:U:")) != EOF)
 412                 switch (c)
 413                 {
 414                         case 'c':
 415                                 if (safe_strtoi(optarg, &max_mount_count) ||  max_mount_count > 16000) {
 416                                         goto MOUNTS_COUNT_ERROR;
 417                                 }
 418                                 if (max_mount_count == 0)
 419                                         max_mount_count = -1;
 420                                 c_flag = 1;
 421                                 open_flag = EXT2_FLAG_RW;
 422                                 break;
 423                         case 'C':
 424                                 if (safe_strtoi(optarg, &mount_count) || mount_count > 16000) {
 425 MOUNTS_COUNT_ERROR:
 426                                         bb_error_msg_and_die("bad mounts count - %s", optarg);
 427                                 }
 428                                 C_flag = 1;
 429                                 open_flag = EXT2_FLAG_RW;
 430                                 break;
 431                         case 'e':
 432                                 if (strcmp (optarg, "continue") == 0)
 433                                         errors = EXT2_ERRORS_CONTINUE;
 434                                 else if (strcmp (optarg, "remount-ro") == 0)
 435                                         errors = EXT2_ERRORS_RO;
 436                                 else if (strcmp (optarg, "panic") == 0)
 437                                         errors = EXT2_ERRORS_PANIC;
 438                                 else {
 439                                         bb_error_msg_and_die("bad error behavior - %s", optarg);
 440                                 }
 441                                 e_flag = 1;
 442                                 open_flag = EXT2_FLAG_RW;
 443                                 break;
 444                         case 'f': /* Force */
 445                                 f_flag = 1;
 446                                 break;
 447                         case 'g':
 448                                 if (safe_strtoul(optarg, &resgid))
 449                                         resgid = bb_xgetgrnam(optarg);
 450                                 g_flag = 1;
 451                                 open_flag = EXT2_FLAG_RW;
 452                                 break;
 453                         case 'i':
 454                                 interval = strtoul (optarg, &tmp, 0);
 455                                 switch (*tmp) {
 456                                 case 's':
 457                                         tmp++;
 458                                         break;
 459                                 case '\0':
 460                                 case 'd':
 461                                 case 'D': /* days */
 462                                         interval *= 86400;
 463                                         if (*tmp != '\0')
 464                                                 tmp++;
 465                                         break;
 466                                 case 'm':
 467                                 case 'M': /* months! */
 468                                         interval *= 86400 * 30;
 469                                         tmp++;
 470                                         break;
 471                                 case 'w':
 472                                 case 'W': /* weeks */
 473                                         interval *= 86400 * 7;
 474                                         tmp++;
 475                                         break;
 476                                 }
 477                                 if (*tmp || interval > (365 * 86400)) {
 478                                         bb_error_msg_and_die("bad interval - %s", optarg);
 479                                 }
 480                                 i_flag = 1;
 481                                 open_flag = EXT2_FLAG_RW;
 482                                 break;
 483                         case 'j':
 484                                 if (!journal_size)
 485                                         journal_size = -1;
 486                                 open_flag = EXT2_FLAG_RW;
 487                                 break;
 488                         case 'J':
 489                                 parse_journal_opts(&journal_device, &journal_flags, &journal_size, optarg);
 490                                 open_flag = EXT2_FLAG_RW;
 491                                 break;
 492                         case 'l':
 493                                 l_flag = 1;
 494                                 break;
 495                         case 'L':
 496                                 new_label = optarg;
 497                                 L_flag = 1;
 498                                 open_flag = EXT2_FLAG_RW |
 499                                         EXT2_FLAG_JOURNAL_DEV_OK;
 500                                 break;
 501                         case 'm':
 502                                 if(safe_strtoul(optarg, &reserved_ratio) || reserved_ratio > 50) {
 503                                         bb_error_msg_and_die("bad reserved block ratio - %s", optarg);
 504                                 }
 505                                 m_flag = 1;
 506                                 open_flag = EXT2_FLAG_RW;
 507                                 break;
 508                         case 'M':
 509                                 new_last_mounted = optarg;
 510                                 M_flag = 1;
 511                                 open_flag = EXT2_FLAG_RW;
 512                                 break;
 513                         case 'o':
 514                                 if (mntopts_cmd) {
 515                                         bb_error_msg_and_die("-o may only be specified once");
 516                                 }
 517                                 mntopts_cmd = optarg;
 518                                 open_flag = EXT2_FLAG_RW;
 519                                 break;
 520
 521                         case 'O':
 522                                 if (features_cmd) {
 523                                         bb_error_msg_and_die("-O may only be specified once");
 524                                 }
 525                                 features_cmd = optarg;
 526                                 open_flag = EXT2_FLAG_RW;
 527                                 break;
 528                         case 'r':
 529                                 if(safe_strtoul(optarg, &reserved_blocks)) {
 530                                         bb_error_msg_and_die("bad reserved blocks count - %s", optarg);
 531                                 }
 532                                 r_flag = 1;
 533                                 open_flag = EXT2_FLAG_RW;
 534                                 break;
 535                         case 's':
 536                                 s_flag = atoi(optarg);
 537                                 open_flag = EXT2_FLAG_RW;
 538                                 break;
 539                         case 'T':
 540                                 T_flag = 1;
 541                                 last_check_time = parse_time(optarg);
 542                                 open_flag = EXT2_FLAG_RW;
 543                                 break;
 544                         case 'u':
 545                                 if (safe_strtoul(optarg, &resuid))
 546                                         resuid = bb_xgetpwnam(optarg);
 547                                 u_flag = 1;
 548                                 open_flag = EXT2_FLAG_RW;
 549                                 break;
 550                         case 'U':
 551                                 new_UUID = optarg;
 552                                 U_flag = 1;
 553                                 open_flag = EXT2_FLAG_RW |
 554                                         EXT2_FLAG_JOURNAL_DEV_OK;
 555                                 break;
 556                         default:
 557                                 bb_show_usage();
 558                 }
 559         if (optind < argc - 1 || optind == argc)
 560                 bb_show_usage();
 561         if (!open_flag && !l_flag)
 562                 bb_show_usage();
 563         io_options = strchr(argv[optind], '?');
 564         if (io_options)
 565                 *io_options++ = 0;
 566         device_name = x_blkid_get_devname(argv[optind]);
 567 }
 568
 569 #ifdef CONFIG_FINDFS
 570 static ATTRIBUTE_NORETURN void do_findfs(int argc, char **argv)
 571 {
 572         if ((argc != 2) ||
 573             (strncmp(argv[1], "LABEL=", 6) && strncmp(argv[1], "UUID=", 5)))
 574                 bb_show_usage();
 575         device_name = x_blkid_get_devname(argv[1]);
 576         puts(device_name);
 577         exit(0);
 578 }
 579 #else
 580 #define do_findfs(x, y)
 581 #endif
 582
 583 static void tune2fs_clean_up(void)
 584 {
 585         if (ENABLE_FEATURE_CLEAN_UP && device_name) free(device_name);
 586         if (ENABLE_FEATURE_CLEAN_UP && journal_device) free(journal_device);
 587 }
 588
 589 int tune2fs_main(int argc, char **argv)
 590 {
 591         errcode_t retval;
 592         ext2_filsys fs;
 593         struct ext2_super_block *sb;
 594         io_manager io_ptr;
 595
 596         if (ENABLE_FEATURE_CLEAN_UP)
 597                 atexit(tune2fs_clean_up);
 598
 599         if (ENABLE_FINDFS && (bb_applet_name[0] == 'f')) /* findfs */
 600                 do_findfs(argc, argv);  /* no return */
 601         else if (ENABLE_E2LABEL && (bb_applet_name[0] == 'e')) /* e2label */
 602                 parse_e2label_options(argc, argv);
 603         else
 604                 parse_tune2fs_options(argc, argv);  /* tune2fs */
 605
 606         io_ptr = unix_io_manager;
 607         retval = ext2fs_open2(device_name, io_options, open_flag,
 608                               0, 0, io_ptr, &fs);
 609         if (retval)
 610                 bb_error_msg_and_die("No valid superblock on %s", device_name);
 611         sb = fs->super;
 612         if (print_label) {
 613                 /* For e2label emulation */
 614                 printf("%.*s\n", (int) sizeof(sb->s_volume_name),
 615                        sb->s_volume_name);
 616                 return 0;
 617         }
 618         retval = ext2fs_check_if_mounted(device_name, &mount_flags);
 619         if (retval)
 620                 bb_error_msg_and_die("Could not determine if %s is mounted", device_name);
 621         /* Normally we only need to write out the superblock */
 622         fs->flags |= EXT2_FLAG_SUPER_ONLY;
 623
 624         if (c_flag) {
 625                 sb->s_max_mnt_count = max_mount_count;
 626                 ext2fs_mark_super_dirty(fs);
 627                 printf("Setting maximal mount count to %d\n", max_mount_count);
 628         }
 629         if (C_flag) {
 630                 sb->s_mnt_count = mount_count;
 631                 ext2fs_mark_super_dirty(fs);
 632                 printf("Setting current mount count to %d\n", mount_count);
 633         }
 634         if (e_flag) {
 635                 sb->s_errors = errors;
 636                 ext2fs_mark_super_dirty(fs);
 637                 printf("Setting error behavior to %d\n", errors);
 638         }
 639         if (g_flag) {
 640                 sb->s_def_resgid = resgid;
 641                 ext2fs_mark_super_dirty(fs);
 642                 printf("Setting reserved blocks gid to %lu\n", resgid);
 643         }
 644         if (i_flag) {
 645                 sb->s_checkinterval = interval;
 646                 ext2fs_mark_super_dirty(fs);
 647                 printf("Setting interval between check %lu seconds\n", interval);
 648         }
 649         if (m_flag) {
 650                 sb->s_r_blocks_count = (sb->s_blocks_count / 100)
 651                         * reserved_ratio;
 652                 ext2fs_mark_super_dirty(fs);
 653                 printf("Setting reserved blocks percentage to %lu (%u blocks)\n",
 654                         reserved_ratio, sb->s_r_blocks_count);
 655         }
 656         if (r_flag) {
 657                 if (reserved_blocks >= sb->s_blocks_count/2)
 658                         bb_error_msg_and_die("reserved blocks count is too big (%lu)", reserved_blocks);
 659                 sb->s_r_blocks_count = reserved_blocks;
 660                 ext2fs_mark_super_dirty(fs);
 661                 printf("Setting reserved blocks count to %lu\n", reserved_blocks);
 662         }
 663         if (s_flag == 1) {
 664                 if (sb->s_feature_ro_compat &
 665                     EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)
 666                         bb_error_msg("\nThe filesystem already has sparse superblocks\n");
 667                 else {
 668                         sb->s_feature_ro_compat |=
 669                                 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 670                         sb->s_state &= ~EXT2_VALID_FS;
 671                         ext2fs_mark_super_dirty(fs);
 672                         printf("\nSparse superblock flag set.  %s", please_fsck);
 673                 }
 674         }
 675         if (s_flag == 0) {
 676                 if (!(sb->s_feature_ro_compat &
 677                       EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER))
 678                         bb_error_msg("\nThe filesystem already has sparse superblocks disabled\n");
 679                 else {
 680                         sb->s_feature_ro_compat &=
 681                                 ~EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
 682                         sb->s_state &= ~EXT2_VALID_FS;
 683                         fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
 684                         ext2fs_mark_super_dirty(fs);
 685                         printf("\nSparse superblock flag cleared.  %s", please_fsck);
 686                 }
 687         }
 688         if (T_flag) {
 689                 sb->s_lastcheck = last_check_time;
 690                 ext2fs_mark_super_dirty(fs);
 691                 printf("Setting time filesystem last checked to %s\n",
 692                        ctime(&last_check_time));
 693         }
 694         if (u_flag) {
 695                 sb->s_def_resuid = resuid;
 696                 ext2fs_mark_super_dirty(fs);
 697                 printf("Setting reserved blocks uid to %lu\n", resuid);
 698         }
 699         if (L_flag) {
 700                 if (strlen(new_label) > sizeof(sb->s_volume_name))
 701                         bb_error_msg("Warning: label too long, truncating\n");
 702                 memset(sb->s_volume_name, 0, sizeof(sb->s_volume_name));
 703                 safe_strncpy(sb->s_volume_name, new_label,
 704                         sizeof(sb->s_volume_name));
 705                 ext2fs_mark_super_dirty(fs);
 706         }
 707         if (M_flag) {
 708                 memset(sb->s_last_mounted, 0, sizeof(sb->s_last_mounted));
 709                 safe_strncpy(sb->s_last_mounted, new_last_mounted,
 710                         sizeof(sb->s_last_mounted));
 711                 ext2fs_mark_super_dirty(fs);
 712         }
 713         if (mntopts_cmd)
 714                 update_mntopts(fs, mntopts_cmd);
 715         if (features_cmd)
 716                 update_feature_set(fs, features_cmd);
 717         if (journal_size || journal_device)
 718                 add_journal(fs);
 719
 720         if (U_flag) {
 721                 if ((strcasecmp(new_UUID, "null") == 0) ||
 722                     (strcasecmp(new_UUID, "clear") == 0)) {
 723                         uuid_clear(sb->s_uuid);
 724                 } else if (strcasecmp(new_UUID, "time") == 0) {
 725                         uuid_generate_time(sb->s_uuid);
 726                 } else if (strcasecmp(new_UUID, "random") == 0) {
 727                         uuid_generate(sb->s_uuid);
 728                 } else if (uuid_parse(new_UUID, sb->s_uuid)) {
 729                         bb_error_msg_and_die("Invalid UUID format");
 730                 }
 731                 ext2fs_mark_super_dirty(fs);
 732         }
 733
 734         if (l_flag)
 735                 list_super (sb);
 736         return (ext2fs_close (fs) ? 1 : 0);
 737 }