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