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Diffstat (limited to 'e2fsprogs/tune2fs.c')
-rw-r--r--e2fsprogs/tune2fs.c729
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diff --git a/e2fsprogs/tune2fs.c b/e2fsprogs/tune2fs.c
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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
49static char * device_name = NULL;
50static char * new_label, *new_last_mounted, *new_UUID;
51static char * io_options;
52static int c_flag, C_flag, e_flag, f_flag, g_flag, i_flag, l_flag, L_flag;
53static int m_flag, M_flag, r_flag, s_flag = -1, u_flag, U_flag, T_flag;
54static time_t last_check_time;
55static int print_label;
56static int max_mount_count, mount_count, mount_flags;
57static unsigned long interval, reserved_blocks;
58static unsigned reserved_ratio;
59static unsigned long resgid, resuid;
60static unsigned short errors;
61static int open_flag;
62static char *features_cmd;
63static char *mntopts_cmd;
64
65static int journal_size, journal_flags;
66static char *journal_device = NULL;
67
68static const char *please_fsck = "Please run e2fsck on the filesystem\n";
69
70static __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 */
79static 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
154no_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 */
165static 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 */
183static 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";
215REMOVE_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 */
225static 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 */
237static 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 */
325static 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 */
349static 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
359static 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
378static 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("Cannot parse date/time specifier: %s", str);
400 }
401 return mktime(&ts);
402}
403
404static 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 max_mount_count = xatou_range(optarg, 0, 16000);
415 if (max_mount_count == 0)
416 max_mount_count = -1;
417 c_flag = 1;
418 open_flag = EXT2_FLAG_RW;
419 break;
420 case 'C':
421 mount_count = xatou_range(optarg, 0, 16000);
422 C_flag = 1;
423 open_flag = EXT2_FLAG_RW;
424 break;
425 case 'e':
426 if (strcmp (optarg, "continue") == 0)
427 errors = EXT2_ERRORS_CONTINUE;
428 else if (strcmp (optarg, "remount-ro") == 0)
429 errors = EXT2_ERRORS_RO;
430 else if (strcmp (optarg, "panic") == 0)
431 errors = EXT2_ERRORS_PANIC;
432 else {
433 bb_error_msg_and_die("bad error behavior - %s", optarg);
434 }
435 e_flag = 1;
436 open_flag = EXT2_FLAG_RW;
437 break;
438 case 'f': /* Force */
439 f_flag = 1;
440 break;
441 case 'g':
442 resgid = bb_strtoul(optarg, NULL, 10);
443 if (errno)
444 resgid = bb_xgetgrnam(optarg);
445 g_flag = 1;
446 open_flag = EXT2_FLAG_RW;
447 break;
448 case 'i':
449 interval = strtoul(optarg, &tmp, 0);
450 switch (*tmp) {
451 case 's':
452 tmp++;
453 break;
454 case '\0':
455 case 'd':
456 case 'D': /* days */
457 interval *= 86400;
458 if (*tmp != '\0')
459 tmp++;
460 break;
461 case 'm':
462 case 'M': /* months! */
463 interval *= 86400 * 30;
464 tmp++;
465 break;
466 case 'w':
467 case 'W': /* weeks */
468 interval *= 86400 * 7;
469 tmp++;
470 break;
471 }
472 if (*tmp || interval > (365 * 86400)) {
473 bb_error_msg_and_die("bad interval - %s", optarg);
474 }
475 i_flag = 1;
476 open_flag = EXT2_FLAG_RW;
477 break;
478 case 'j':
479 if (!journal_size)
480 journal_size = -1;
481 open_flag = EXT2_FLAG_RW;
482 break;
483 case 'J':
484 parse_journal_opts(&journal_device, &journal_flags, &journal_size, optarg);
485 open_flag = EXT2_FLAG_RW;
486 break;
487 case 'l':
488 l_flag = 1;
489 break;
490 case 'L':
491 new_label = optarg;
492 L_flag = 1;
493 open_flag = EXT2_FLAG_RW |
494 EXT2_FLAG_JOURNAL_DEV_OK;
495 break;
496 case 'm':
497 reserved_ratio = xatou_range(optarg, 0, 50);
498 m_flag = 1;
499 open_flag = EXT2_FLAG_RW;
500 break;
501 case 'M':
502 new_last_mounted = optarg;
503 M_flag = 1;
504 open_flag = EXT2_FLAG_RW;
505 break;
506 case 'o':
507 if (mntopts_cmd) {
508 bb_error_msg_and_die("-o may only be specified once");
509 }
510 mntopts_cmd = optarg;
511 open_flag = EXT2_FLAG_RW;
512 break;
513
514 case 'O':
515 if (features_cmd) {
516 bb_error_msg_and_die("-O may only be specified once");
517 }
518 features_cmd = optarg;
519 open_flag = EXT2_FLAG_RW;
520 break;
521 case 'r':
522 reserved_blocks = xatoul(optarg);
523 r_flag = 1;
524 open_flag = EXT2_FLAG_RW;
525 break;
526 case 's':
527 s_flag = atoi(optarg);
528 open_flag = EXT2_FLAG_RW;
529 break;
530 case 'T':
531 T_flag = 1;
532 last_check_time = parse_time(optarg);
533 open_flag = EXT2_FLAG_RW;
534 break;
535 case 'u':
536 resuid = bb_strtoul(optarg, NULL, 10);
537 if (errno)
538 resuid = bb_xgetpwnam(optarg);
539 u_flag = 1;
540 open_flag = EXT2_FLAG_RW;
541 break;
542 case 'U':
543 new_UUID = optarg;
544 U_flag = 1;
545 open_flag = EXT2_FLAG_RW |
546 EXT2_FLAG_JOURNAL_DEV_OK;
547 break;
548 default:
549 bb_show_usage();
550 }
551 if (optind < argc - 1 || optind == argc)
552 bb_show_usage();
553 if (!open_flag && !l_flag)
554 bb_show_usage();
555 io_options = strchr(argv[optind], '?');
556 if (io_options)
557 *io_options++ = 0;
558 device_name = x_blkid_get_devname(argv[optind]);
559}
560
561#ifdef CONFIG_FINDFS
562static ATTRIBUTE_NORETURN void do_findfs(int argc, char **argv)
563{
564 if ((argc != 2) ||
565 (strncmp(argv[1], "LABEL=", 6) && strncmp(argv[1], "UUID=", 5)))
566 bb_show_usage();
567 device_name = x_blkid_get_devname(argv[1]);
568 puts(device_name);
569 exit(0);
570}
571#else
572#define do_findfs(x, y)
573#endif
574
575static void tune2fs_clean_up(void)
576{
577 if (ENABLE_FEATURE_CLEAN_UP && device_name) free(device_name);
578 if (ENABLE_FEATURE_CLEAN_UP && journal_device) free(journal_device);
579}
580
581int tune2fs_main(int argc, char **argv)
582{
583 errcode_t retval;
584 ext2_filsys fs;
585 struct ext2_super_block *sb;
586 io_manager io_ptr;
587
588 if (ENABLE_FEATURE_CLEAN_UP)
589 atexit(tune2fs_clean_up);
590
591 if (ENABLE_FINDFS && (applet_name[0] == 'f')) /* findfs */
592 do_findfs(argc, argv); /* no return */
593 else if (ENABLE_E2LABEL && (applet_name[0] == 'e')) /* e2label */
594 parse_e2label_options(argc, argv);
595 else
596 parse_tune2fs_options(argc, argv); /* tune2fs */
597
598 io_ptr = unix_io_manager;
599 retval = ext2fs_open2(device_name, io_options, open_flag,
600 0, 0, io_ptr, &fs);
601 if (retval)
602 bb_error_msg_and_die("No valid superblock on %s", device_name);
603 sb = fs->super;
604 if (print_label) {
605 /* For e2label emulation */
606 printf("%.*s\n", (int) sizeof(sb->s_volume_name),
607 sb->s_volume_name);
608 return 0;
609 }
610 retval = ext2fs_check_if_mounted(device_name, &mount_flags);
611 if (retval)
612 bb_error_msg_and_die("cannot determine if %s is mounted", device_name);
613 /* Normally we only need to write out the superblock */
614 fs->flags |= EXT2_FLAG_SUPER_ONLY;
615
616 if (c_flag) {
617 sb->s_max_mnt_count = max_mount_count;
618 ext2fs_mark_super_dirty(fs);
619 printf("Setting maximal mount count to %d\n", max_mount_count);
620 }
621 if (C_flag) {
622 sb->s_mnt_count = mount_count;
623 ext2fs_mark_super_dirty(fs);
624 printf("Setting current mount count to %d\n", mount_count);
625 }
626 if (e_flag) {
627 sb->s_errors = errors;
628 ext2fs_mark_super_dirty(fs);
629 printf("Setting error behavior to %d\n", errors);
630 }
631 if (g_flag) {
632 sb->s_def_resgid = resgid;
633 ext2fs_mark_super_dirty(fs);
634 printf("Setting reserved blocks gid to %lu\n", resgid);
635 }
636 if (i_flag) {
637 sb->s_checkinterval = interval;
638 ext2fs_mark_super_dirty(fs);
639 printf("Setting interval between check %lu seconds\n", interval);
640 }
641 if (m_flag) {
642 sb->s_r_blocks_count = (sb->s_blocks_count / 100)
643 * reserved_ratio;
644 ext2fs_mark_super_dirty(fs);
645 printf("Setting reserved blocks percentage to %u (%u blocks)\n",
646 reserved_ratio, sb->s_r_blocks_count);
647 }
648 if (r_flag) {
649 if (reserved_blocks >= sb->s_blocks_count/2)
650 bb_error_msg_and_die("reserved blocks count is too big (%lu)", reserved_blocks);
651 sb->s_r_blocks_count = reserved_blocks;
652 ext2fs_mark_super_dirty(fs);
653 printf("Setting reserved blocks count to %lu\n", reserved_blocks);
654 }
655 if (s_flag == 1) {
656 if (sb->s_feature_ro_compat &
657 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)
658 bb_error_msg("\nThe filesystem already has sparse superblocks");
659 else {
660 sb->s_feature_ro_compat |=
661 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
662 sb->s_state &= ~EXT2_VALID_FS;
663 ext2fs_mark_super_dirty(fs);
664 printf("\nSparse superblock flag set. %s", please_fsck);
665 }
666 }
667 if (s_flag == 0) {
668 if (!(sb->s_feature_ro_compat &
669 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER))
670 bb_error_msg("\nThe filesystem already has sparse superblocks disabled");
671 else {
672 sb->s_feature_ro_compat &=
673 ~EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
674 sb->s_state &= ~EXT2_VALID_FS;
675 fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
676 ext2fs_mark_super_dirty(fs);
677 printf("\nSparse superblock flag cleared. %s", please_fsck);
678 }
679 }
680 if (T_flag) {
681 sb->s_lastcheck = last_check_time;
682 ext2fs_mark_super_dirty(fs);
683 printf("Setting time filesystem last checked to %s\n",
684 ctime(&last_check_time));
685 }
686 if (u_flag) {
687 sb->s_def_resuid = resuid;
688 ext2fs_mark_super_dirty(fs);
689 printf("Setting reserved blocks uid to %lu\n", resuid);
690 }
691 if (L_flag) {
692 if (strlen(new_label) > sizeof(sb->s_volume_name))
693 bb_error_msg("Warning: label too long, truncating");
694 memset(sb->s_volume_name, 0, sizeof(sb->s_volume_name));
695 safe_strncpy(sb->s_volume_name, new_label,
696 sizeof(sb->s_volume_name));
697 ext2fs_mark_super_dirty(fs);
698 }
699 if (M_flag) {
700 memset(sb->s_last_mounted, 0, sizeof(sb->s_last_mounted));
701 safe_strncpy(sb->s_last_mounted, new_last_mounted,
702 sizeof(sb->s_last_mounted));
703 ext2fs_mark_super_dirty(fs);
704 }
705 if (mntopts_cmd)
706 update_mntopts(fs, mntopts_cmd);
707 if (features_cmd)
708 update_feature_set(fs, features_cmd);
709 if (journal_size || journal_device)
710 add_journal(fs);
711
712 if (U_flag) {
713 if ((strcasecmp(new_UUID, "null") == 0) ||
714 (strcasecmp(new_UUID, "clear") == 0)) {
715 uuid_clear(sb->s_uuid);
716 } else if (strcasecmp(new_UUID, "time") == 0) {
717 uuid_generate_time(sb->s_uuid);
718 } else if (strcasecmp(new_UUID, "random") == 0) {
719 uuid_generate(sb->s_uuid);
720 } else if (uuid_parse(new_UUID, sb->s_uuid)) {
721 bb_error_msg_and_die("Invalid UUID format");
722 }
723 ext2fs_mark_super_dirty(fs);
724 }
725
726 if (l_flag)
727 list_super (sb);
728 return (ext2fs_close (fs) ? 1 : 0);
729}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-08-14 13:56:39 +0000