1 /* vi: set sw=4 ts=4: */
3 * tune2fs.c - Change the file system parameters on an ext2 file system
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)
9 * Copyright 1995, 1996, 1997, 1998, 1999, 2000 by Theodore Ts'o.
12 * This file may be redistributed under the terms of the GNU Public
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)
29 #include <sys/types.h>
39 #include "ext2fs/ext2_fs.h"
40 #include "ext2fs/ext2fs.h"
41 #include "uuid/uuid.h"
43 #include "ext2fs/kernel-jbd.h"
45 #include "blkid/blkid.h"
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;
61 static char *features_cmd;
62 static char *mntopts_cmd;
64 static int journal_size, journal_flags;
65 static char *journal_device = NULL;
67 static const char *please_fsck = "Please run e2fsck on the filesystem\n";
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
76 * Remove an external journal from the filesystem
78 static void remove_journal_device(ext2_filsys fs)
83 journal_superblock_t *jsb;
86 int commit_remove_journal = 0;
90 commit_remove_journal = 1; /* force removal even if error */
92 uuid_unparse(fs->super->s_journal_uuid, buf);
93 journal_path = blkid_get_devname(NULL, "UUID", buf);
97 ext2fs_find_block_device(fs->super->s_journal_dev);
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);
107 bb_error_msg("Failed to open external journal");
108 goto no_valid_journal;
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;
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;
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;
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)
136 bb_error_msg("Filesystem's UUID not found on journal device");
137 commit_remove_journal = 1;
138 goto no_valid_journal;
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);
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;
151 commit_remove_journal = 1;
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");
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)))
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++;
180 * Remove the journal inode from the filesystem
182 static void remove_journal_inode(ext2_filsys fs)
184 struct ext2_inode inode;
186 ino_t ino = fs->super->s_journal_inum;
187 char *msg = "to read";
188 char *s = "journal inode";
190 retval = ext2fs_read_inode(fs, ino, &inode);
192 goto REMOVE_JOURNAL_INODE_ERROR;
193 if (ino == EXT2_JOURNAL_INO) {
194 retval = ext2fs_read_bitmaps(fs);
196 msg = "to read bitmaps";
198 goto REMOVE_JOURNAL_INODE_ERROR;
200 retval = ext2fs_block_iterate(fs, ino, 0, NULL,
201 release_blocks_proc, NULL);
204 goto REMOVE_JOURNAL_INODE_ERROR;
206 memset(&inode, 0, sizeof(inode));
207 ext2fs_mark_bb_dirty(fs);
208 fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
210 inode.i_flags &= ~EXT2_IMMUTABLE_FL;
211 retval = ext2fs_write_inode(fs, ino, &inode);
214 REMOVE_JOURNAL_INODE_ERROR:
215 bb_error_msg_and_die("Failed %s %s", msg, s);
217 fs->super->s_journal_inum = 0;
218 ext2fs_mark_super_dirty(fs);
222 * Update the default mount options
224 static void update_mntopts(ext2_filsys fs, char *mntopts)
226 struct ext2_super_block *sb= fs->super;
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);
234 * Update the feature set as provided by the user.
236 static void update_feature_set(ext2_filsys fs, char *features)
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;
243 old_compat = sb->s_feature_compat;
244 old_ro_compat = sb->s_feature_ro_compat;
245 old_incompat = sb->s_feature_incompat;
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 "
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.",
281 if (sb->s_journal_inum) {
282 remove_journal_inode(fs);
284 if (sb->s_journal_dev) {
285 remove_journal_device(fs);
288 if (journal && !old_journal) {
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
297 sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
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);
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);
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);
322 * Add a journal to the filesystem.
324 static void add_journal(ext2_filsys fs)
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");
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);
335 * If the filesystem wasn't mounted, we need to force
336 * the block group descriptors out.
338 if ((mount_flags & EXT2_MF_MOUNTED) == 0)
339 fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
341 print_check_message(fs);
348 static char * x_blkid_get_devname(const char *token)
352 if (!(dev_name = blkid_get_devname(NULL, token, NULL)))
353 bb_error_msg_and_die("Unable to resolve '%s'", token);
357 #ifdef CONFIG_E2LABEL
358 static void parse_e2label_options(int argc, char ** argv)
360 if ((argc < 2) || (argc > 3))
362 io_options = strchr(argv[1], '?');
365 device_name = x_blkid_get_devname(argv[1]);
367 open_flag = EXT2_FLAG_RW | EXT2_FLAG_JOURNAL_DEV_OK;
374 #define parse_e2label_options(x,y)
377 static time_t parse_time(char *str)
381 if (strcmp(str, "now") == 0) {
384 memset(&ts, 0, sizeof(ts));
386 strptime(str, "%Y%m%d%H%M%S", &ts);
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);
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)
397 if (ts.tm_mday == 0) {
398 bb_error_msg_and_die("Cannot parse date/time specifier: %s", str);
400 return (mktime(&ts));
403 static void parse_tune2fs_options(int argc, char **argv)
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)
413 if (safe_strtoi(optarg, &max_mount_count) || max_mount_count > 16000) {
414 goto MOUNTS_COUNT_ERROR;
416 if (max_mount_count == 0)
417 max_mount_count = -1;
419 open_flag = EXT2_FLAG_RW;
422 if (safe_strtoi(optarg, &mount_count) || mount_count > 16000) {
424 bb_error_msg_and_die("bad mounts count - %s", optarg);
427 open_flag = EXT2_FLAG_RW;
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;
437 bb_error_msg_and_die("bad error behavior - %s", optarg);
440 open_flag = EXT2_FLAG_RW;
442 case 'f': /* Force */
446 if (safe_strtoul(optarg, &resgid))
447 resgid = bb_xgetgrnam(optarg);
449 open_flag = EXT2_FLAG_RW;
452 interval = strtoul (optarg, &tmp, 0);
465 case 'M': /* months! */
466 interval *= 86400 * 30;
470 case 'W': /* weeks */
471 interval *= 86400 * 7;
475 if (*tmp || interval > (365 * 86400)) {
476 bb_error_msg_and_die("bad interval - %s", optarg);
479 open_flag = EXT2_FLAG_RW;
484 open_flag = EXT2_FLAG_RW;
487 parse_journal_opts(&journal_device, &journal_flags, &journal_size, optarg);
488 open_flag = EXT2_FLAG_RW;
496 open_flag = EXT2_FLAG_RW |
497 EXT2_FLAG_JOURNAL_DEV_OK;
500 if(safe_strtoul(optarg, &reserved_ratio) || reserved_ratio > 50) {
501 bb_error_msg_and_die("bad reserved block ratio - %s", optarg);
504 open_flag = EXT2_FLAG_RW;
507 new_last_mounted = optarg;
509 open_flag = EXT2_FLAG_RW;
513 bb_error_msg_and_die("-o may only be specified once");
515 mntopts_cmd = optarg;
516 open_flag = EXT2_FLAG_RW;
521 bb_error_msg_and_die("-O may only be specified once");
523 features_cmd = optarg;
524 open_flag = EXT2_FLAG_RW;
527 if(safe_strtoul(optarg, &reserved_blocks)) {
528 bb_error_msg_and_die("bad reserved blocks count - %s", optarg);
531 open_flag = EXT2_FLAG_RW;
534 s_flag = atoi(optarg);
535 open_flag = EXT2_FLAG_RW;
539 last_check_time = parse_time(optarg);
540 open_flag = EXT2_FLAG_RW;
543 if (safe_strtoul(optarg, &resuid))
544 resuid = bb_xgetpwnam(optarg);
546 open_flag = EXT2_FLAG_RW;
551 open_flag = EXT2_FLAG_RW |
552 EXT2_FLAG_JOURNAL_DEV_OK;
557 if (optind < argc - 1 || optind == argc)
559 if (!open_flag && !l_flag)
561 io_options = strchr(argv[optind], '?');
564 device_name = x_blkid_get_devname(argv[optind]);
568 static ATTRIBUTE_NORETURN void do_findfs(int argc, char **argv)
571 (strncmp(argv[1], "LABEL=", 6) && strncmp(argv[1], "UUID=", 5)))
573 device_name = x_blkid_get_devname(argv[1]);
578 #define do_findfs(x, y)
581 static void tune2fs_clean_up(void)
583 if (ENABLE_FEATURE_CLEAN_UP && device_name) free(device_name);
584 if (ENABLE_FEATURE_CLEAN_UP && journal_device) free(journal_device);
587 int tune2fs_main(int argc, char **argv)
591 struct ext2_super_block *sb;
594 if (ENABLE_FEATURE_CLEAN_UP)
595 atexit(tune2fs_clean_up);
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);
602 parse_tune2fs_options(argc, argv); /* tune2fs */
604 io_ptr = unix_io_manager;
605 retval = ext2fs_open2(device_name, io_options, open_flag,
608 bb_error_msg_and_die("No valid superblock on %s", device_name);
611 /* For e2label emulation */
612 printf("%.*s\n", (int) sizeof(sb->s_volume_name),
616 retval = ext2fs_check_if_mounted(device_name, &mount_flags);
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;
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);
628 sb->s_mnt_count = mount_count;
629 ext2fs_mark_super_dirty(fs);
630 printf("Setting current mount count to %d\n", mount_count);
633 sb->s_errors = errors;
634 ext2fs_mark_super_dirty(fs);
635 printf("Setting error behavior to %d\n", errors);
638 sb->s_def_resgid = resgid;
639 ext2fs_mark_super_dirty(fs);
640 printf("Setting reserved blocks gid to %lu\n", resgid);
643 sb->s_checkinterval = interval;
644 ext2fs_mark_super_dirty(fs);
645 printf("Setting interval between check %lu seconds\n", interval);
648 sb->s_r_blocks_count = (sb->s_blocks_count / 100)
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);
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);
662 if (sb->s_feature_ro_compat &
663 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)
664 bb_error_msg("\nThe filesystem already has sparse superblocks");
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);
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");
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);
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));
693 sb->s_def_resuid = resuid;
694 ext2fs_mark_super_dirty(fs);
695 printf("Setting reserved blocks uid to %lu\n", resuid);
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);
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);
712 update_mntopts(fs, mntopts_cmd);
714 update_feature_set(fs, features_cmd);
715 if (journal_size || journal_device)
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");
729 ext2fs_mark_super_dirty(fs);
734 return (ext2fs_close (fs) ? 1 : 0);