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_blocks;
58 static unsigned reserved_ratio;
59 static unsigned long resgid, resuid;
60 static unsigned short errors;
62 static char *features_cmd;
63 static char *mntopts_cmd;
65 static int journal_size, journal_flags;
66 static char *journal_device = NULL;
68 static const char *please_fsck = "Please run e2fsck on the filesystem\n";
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
77 * Remove an external journal from the filesystem
79 static void remove_journal_device(ext2_filsys fs)
84 journal_superblock_t *jsb;
87 int commit_remove_journal = 0;
91 commit_remove_journal = 1; /* force removal even if error */
93 uuid_unparse(fs->super->s_journal_uuid, buf);
94 journal_path = blkid_get_devname(NULL, "UUID", buf);
98 ext2fs_find_block_device(fs->super->s_journal_dev);
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);
108 bb_error_msg("Failed to open external journal");
109 goto no_valid_journal;
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;
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;
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;
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)
137 bb_error_msg("Filesystem's UUID not found on journal device");
138 commit_remove_journal = 1;
139 goto no_valid_journal;
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);
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;
152 commit_remove_journal = 1;
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");
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)))
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++;
181 * Remove the journal inode from the filesystem
183 static void remove_journal_inode(ext2_filsys fs)
185 struct ext2_inode inode;
187 ino_t ino = fs->super->s_journal_inum;
188 char *msg = "to read";
189 char *s = "journal inode";
191 retval = ext2fs_read_inode(fs, ino, &inode);
193 goto REMOVE_JOURNAL_INODE_ERROR;
194 if (ino == EXT2_JOURNAL_INO) {
195 retval = ext2fs_read_bitmaps(fs);
197 msg = "to read bitmaps";
199 goto REMOVE_JOURNAL_INODE_ERROR;
201 retval = ext2fs_block_iterate(fs, ino, 0, NULL,
202 release_blocks_proc, NULL);
205 goto REMOVE_JOURNAL_INODE_ERROR;
207 memset(&inode, 0, sizeof(inode));
208 ext2fs_mark_bb_dirty(fs);
209 fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
211 inode.i_flags &= ~EXT2_IMMUTABLE_FL;
212 retval = ext2fs_write_inode(fs, ino, &inode);
215 REMOVE_JOURNAL_INODE_ERROR:
216 bb_error_msg_and_die("Failed %s %s", msg, s);
218 fs->super->s_journal_inum = 0;
219 ext2fs_mark_super_dirty(fs);
223 * Update the default mount options
225 static void update_mntopts(ext2_filsys fs, char *mntopts)
227 struct ext2_super_block *sb= fs->super;
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);
235 * Update the feature set as provided by the user.
237 static void update_feature_set(ext2_filsys fs, char *features)
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;
244 old_compat = sb->s_feature_compat;
245 old_ro_compat = sb->s_feature_ro_compat;
246 old_incompat = sb->s_feature_incompat;
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 "
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.",
282 if (sb->s_journal_inum) {
283 remove_journal_inode(fs);
285 if (sb->s_journal_dev) {
286 remove_journal_device(fs);
289 if (journal && !old_journal) {
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
298 sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
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);
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);
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);
323 * Add a journal to the filesystem.
325 static void add_journal(ext2_filsys fs)
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");
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);
336 * If the filesystem wasn't mounted, we need to force
337 * the block group descriptors out.
339 if ((mount_flags & EXT2_MF_MOUNTED) == 0)
340 fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
342 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);
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 max_mount_count = xatou_range(optarg, 0, 16000);
414 if (max_mount_count == 0)
415 max_mount_count = -1;
417 open_flag = EXT2_FLAG_RW;
420 mount_count = xatou_range(optarg, 0, 16000);
422 open_flag = EXT2_FLAG_RW;
425 if (strcmp (optarg, "continue") == 0)
426 errors = EXT2_ERRORS_CONTINUE;
427 else if (strcmp (optarg, "remount-ro") == 0)
428 errors = EXT2_ERRORS_RO;
429 else if (strcmp (optarg, "panic") == 0)
430 errors = EXT2_ERRORS_PANIC;
432 bb_error_msg_and_die("bad error behavior - %s", optarg);
435 open_flag = EXT2_FLAG_RW;
437 case 'f': /* Force */
441 resgid = bb_strtoul(optarg, NULL, 10);
443 resgid = xgroup2gid(optarg);
445 open_flag = EXT2_FLAG_RW;
448 interval = strtoul(optarg, &tmp, 0);
461 case 'M': /* months! */
462 interval *= 86400 * 30;
466 case 'W': /* weeks */
467 interval *= 86400 * 7;
471 if (*tmp || interval > (365 * 86400)) {
472 bb_error_msg_and_die("bad interval - %s", optarg);
475 open_flag = EXT2_FLAG_RW;
480 open_flag = EXT2_FLAG_RW;
483 parse_journal_opts(&journal_device, &journal_flags, &journal_size, optarg);
484 open_flag = EXT2_FLAG_RW;
492 open_flag = EXT2_FLAG_RW |
493 EXT2_FLAG_JOURNAL_DEV_OK;
496 reserved_ratio = xatou_range(optarg, 0, 50);
498 open_flag = EXT2_FLAG_RW;
501 new_last_mounted = optarg;
503 open_flag = EXT2_FLAG_RW;
507 bb_error_msg_and_die("-o may only be specified once");
509 mntopts_cmd = optarg;
510 open_flag = EXT2_FLAG_RW;
515 bb_error_msg_and_die("-O may only be specified once");
517 features_cmd = optarg;
518 open_flag = EXT2_FLAG_RW;
521 reserved_blocks = xatoul(optarg);
523 open_flag = EXT2_FLAG_RW;
526 s_flag = atoi(optarg);
527 open_flag = EXT2_FLAG_RW;
531 last_check_time = parse_time(optarg);
532 open_flag = EXT2_FLAG_RW;
535 resuid = bb_strtoul(optarg, NULL, 10);
537 resuid = xuname2uid(optarg);
539 open_flag = EXT2_FLAG_RW;
544 open_flag = EXT2_FLAG_RW |
545 EXT2_FLAG_JOURNAL_DEV_OK;
550 if (optind < argc - 1 || optind == argc)
552 if (!open_flag && !l_flag)
554 io_options = strchr(argv[optind], '?');
557 device_name = x_blkid_get_devname(argv[optind]);
560 static void tune2fs_clean_up(void)
562 if (ENABLE_FEATURE_CLEAN_UP && device_name) free(device_name);
563 if (ENABLE_FEATURE_CLEAN_UP && journal_device) free(journal_device);
566 int tune2fs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
567 int tune2fs_main(int argc, char **argv)
571 struct ext2_super_block *sb;
574 if (ENABLE_FEATURE_CLEAN_UP)
575 atexit(tune2fs_clean_up);
577 if (ENABLE_E2LABEL && (applet_name[0] == 'e')) /* e2label */
578 parse_e2label_options(argc, argv);
580 parse_tune2fs_options(argc, argv); /* tune2fs */
582 io_ptr = unix_io_manager;
583 retval = ext2fs_open2(device_name, io_options, open_flag,
586 bb_error_msg_and_die("No valid superblock on %s", device_name);
589 /* For e2label emulation */
590 printf("%.*s\n", (int) sizeof(sb->s_volume_name),
594 retval = ext2fs_check_if_mounted(device_name, &mount_flags);
596 bb_error_msg_and_die("cannot determine if %s is mounted", device_name);
597 /* Normally we only need to write out the superblock */
598 fs->flags |= EXT2_FLAG_SUPER_ONLY;
601 sb->s_max_mnt_count = max_mount_count;
602 ext2fs_mark_super_dirty(fs);
603 printf("Setting maximal mount count to %d\n", max_mount_count);
606 sb->s_mnt_count = mount_count;
607 ext2fs_mark_super_dirty(fs);
608 printf("Setting current mount count to %d\n", mount_count);
611 sb->s_errors = errors;
612 ext2fs_mark_super_dirty(fs);
613 printf("Setting error behavior to %d\n", errors);
616 sb->s_def_resgid = resgid;
617 ext2fs_mark_super_dirty(fs);
618 printf("Setting reserved blocks gid to %lu\n", resgid);
621 sb->s_checkinterval = interval;
622 ext2fs_mark_super_dirty(fs);
623 printf("Setting interval between check %lu seconds\n", interval);
626 sb->s_r_blocks_count = (sb->s_blocks_count / 100)
628 ext2fs_mark_super_dirty(fs);
629 printf("Setting reserved blocks percentage to %u (%u blocks)\n",
630 reserved_ratio, sb->s_r_blocks_count);
633 if (reserved_blocks >= sb->s_blocks_count/2)
634 bb_error_msg_and_die("reserved blocks count is too big (%lu)", reserved_blocks);
635 sb->s_r_blocks_count = reserved_blocks;
636 ext2fs_mark_super_dirty(fs);
637 printf("Setting reserved blocks count to %lu\n", reserved_blocks);
640 if (sb->s_feature_ro_compat &
641 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)
642 bb_error_msg("\nThe filesystem already has sparse superblocks");
644 sb->s_feature_ro_compat |=
645 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
646 sb->s_state &= ~EXT2_VALID_FS;
647 ext2fs_mark_super_dirty(fs);
648 printf("\nSparse superblock flag set. %s", please_fsck);
652 if (!(sb->s_feature_ro_compat &
653 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER))
654 bb_error_msg("\nThe filesystem already has sparse superblocks disabled");
656 sb->s_feature_ro_compat &=
657 ~EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
658 sb->s_state &= ~EXT2_VALID_FS;
659 fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
660 ext2fs_mark_super_dirty(fs);
661 printf("\nSparse superblock flag cleared. %s", please_fsck);
665 sb->s_lastcheck = last_check_time;
666 ext2fs_mark_super_dirty(fs);
667 printf("Setting time filesystem last checked to %s\n",
668 ctime(&last_check_time));
671 sb->s_def_resuid = resuid;
672 ext2fs_mark_super_dirty(fs);
673 printf("Setting reserved blocks uid to %lu\n", resuid);
676 if (strlen(new_label) > sizeof(sb->s_volume_name))
677 bb_error_msg("Warning: label too long, truncating");
678 memset(sb->s_volume_name, 0, sizeof(sb->s_volume_name));
679 safe_strncpy(sb->s_volume_name, new_label,
680 sizeof(sb->s_volume_name));
681 ext2fs_mark_super_dirty(fs);
684 memset(sb->s_last_mounted, 0, sizeof(sb->s_last_mounted));
685 safe_strncpy(sb->s_last_mounted, new_last_mounted,
686 sizeof(sb->s_last_mounted));
687 ext2fs_mark_super_dirty(fs);
690 update_mntopts(fs, mntopts_cmd);
692 update_feature_set(fs, features_cmd);
693 if (journal_size || journal_device)
697 if ((strcasecmp(new_UUID, "null") == 0) ||
698 (strcasecmp(new_UUID, "clear") == 0)) {
699 uuid_clear(sb->s_uuid);
700 } else if (strcasecmp(new_UUID, "time") == 0) {
701 uuid_generate_time(sb->s_uuid);
702 } else if (strcasecmp(new_UUID, "random") == 0) {
703 uuid_generate(sb->s_uuid);
704 } else if (uuid_parse(new_UUID, sb->s_uuid)) {
705 bb_error_msg_and_die("Invalid UUID format");
707 ext2fs_mark_super_dirty(fs);
712 return (ext2fs_close (fs) ? 1 : 0);