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