1 /*
2 * main.c --- ext2 resizer main program
3 *
4 * Copyright (C) 1997, 1998 by Theodore Ts'o and
5 * PowerQuest, Inc.
6 *
7 * Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004 by Theodore Ts'o
8 *
9 * %Begin-Header%
10 * This file may be redistributed under the terms of the GNU Public
11 * License.
12 * %End-Header%
13 */
14
15 #ifndef _LARGEFILE_SOURCE
16 #define _LARGEFILE_SOURCE
17 #endif
18 #ifndef _LARGEFILE64_SOURCE
19 #define _LARGEFILE64_SOURCE
20 #endif
21
22 #include "config.h"
23 #ifdef HAVE_GETOPT_H
24 #include <getopt.h>
25 #else
26 extern char *optarg;
27 extern int optind;
28 #endif
29 #include <unistd.h>
30 #ifdef HAVE_STDLIB_H
31 #include <stdlib.h>
32 #endif
33 #include <sys/types.h>
34 #include <sys/stat.h>
35 #include <fcntl.h>
36 #include <libgen.h>
37
38 #include "e2p/e2p.h"
39
40 #include "resize2fs.h"
41
42 #include "../version.h"
43
44 char *program_name;
45 static char *device_name, *io_options;
46
usage(char * prog)47 static void usage (char *prog)
48 {
49 fprintf (stderr, _("Usage: %s [-d debug_flags] [-f] [-F] [-M] [-P] "
50 "[-p] device [-b|-s|new_size] [-S RAID-stride] "
51 "[-z undo_file]\n\n"),
52 prog ? prog : "resize2fs");
53
54 exit (1);
55 }
56
resize_progress_func(ext2_resize_t rfs,int pass,unsigned long cur,unsigned long max)57 static errcode_t resize_progress_func(ext2_resize_t rfs, int pass,
58 unsigned long cur, unsigned long max)
59 {
60 ext2_sim_progmeter progress;
61 const char *label;
62 errcode_t retval;
63
64 progress = (ext2_sim_progmeter) rfs->prog_data;
65 if (max == 0)
66 return 0;
67 if (cur == 0) {
68 if (progress)
69 ext2fs_progress_close(progress);
70 progress = 0;
71 switch (pass) {
72 case E2_RSZ_EXTEND_ITABLE_PASS:
73 label = _("Extending the inode table");
74 break;
75 case E2_RSZ_BLOCK_RELOC_PASS:
76 label = _("Relocating blocks");
77 break;
78 case E2_RSZ_INODE_SCAN_PASS:
79 label = _("Scanning inode table");
80 break;
81 case E2_RSZ_INODE_REF_UPD_PASS:
82 label = _("Updating inode references");
83 break;
84 case E2_RSZ_MOVE_ITABLE_PASS:
85 label = _("Moving inode table");
86 break;
87 default:
88 label = _("Unknown pass?!?");
89 break;
90 }
91 printf(_("Begin pass %d (max = %lu)\n"), pass, max);
92 retval = ext2fs_progress_init(&progress, label, 30,
93 40, max, 0);
94 if (retval)
95 progress = 0;
96 rfs->prog_data = (void *) progress;
97 }
98 if (progress)
99 ext2fs_progress_update(progress, cur);
100 if (cur >= max) {
101 if (progress)
102 ext2fs_progress_close(progress);
103 progress = 0;
104 rfs->prog_data = 0;
105 }
106 return 0;
107 }
108
determine_fs_stride(ext2_filsys fs)109 static void determine_fs_stride(ext2_filsys fs)
110 {
111 unsigned int group;
112 unsigned long long sum;
113 unsigned int has_sb, prev_has_sb = 0, num;
114 unsigned int flexbg_size = 1U << fs->super->s_log_groups_per_flex;
115 int i_stride, b_stride;
116
117 if (fs->stride)
118 return;
119 num = 0; sum = 0;
120 for (group = 0; group < fs->group_desc_count; group++) {
121 has_sb = ext2fs_bg_has_super(fs, group);
122 if (group == 0 || has_sb != prev_has_sb)
123 goto next;
124 b_stride = ext2fs_block_bitmap_loc(fs, group) -
125 ext2fs_block_bitmap_loc(fs, group - 1) -
126 fs->super->s_blocks_per_group;
127 i_stride = ext2fs_inode_bitmap_loc(fs, group) -
128 ext2fs_inode_bitmap_loc(fs, group - 1) -
129 fs->super->s_blocks_per_group;
130 if (b_stride != i_stride ||
131 b_stride < 0 ||
132 (flexbg_size > 1 && (group % flexbg_size == 0)))
133 goto next;
134
135 /* printf("group %d has stride %d\n", group, b_stride); */
136 sum += b_stride;
137 num++;
138
139 next:
140 prev_has_sb = has_sb;
141 }
142
143 if (fs->group_desc_count > 12 && num < 3)
144 sum = 0;
145
146 if (num)
147 fs->stride = sum / num;
148 else
149 fs->stride = 0;
150
151 fs->super->s_raid_stride = fs->stride;
152 ext2fs_mark_super_dirty(fs);
153
154 #if 0
155 if (fs->stride)
156 printf("Using RAID stride of %d\n", fs->stride);
157 #endif
158 }
159
bigalloc_check(ext2_filsys fs,int force)160 static void bigalloc_check(ext2_filsys fs, int force)
161 {
162 if (!force && ext2fs_has_feature_bigalloc(fs->super)) {
163 fprintf(stderr, "%s", _("\nResizing bigalloc file systems has "
164 "not been fully tested. Proceed at\n"
165 "your own risk! Use the force option "
166 "if you want to go ahead anyway.\n\n"));
167 exit(1);
168 }
169 }
170
resize2fs_setup_tdb(const char * device,char * undo_file,io_manager * io_ptr)171 static int resize2fs_setup_tdb(const char *device, char *undo_file,
172 io_manager *io_ptr)
173 {
174 errcode_t retval = ENOMEM;
175 const char *tdb_dir = NULL;
176 char *tdb_file = NULL;
177 char *dev_name, *tmp_name;
178
179 /* (re)open a specific undo file */
180 if (undo_file && undo_file[0] != 0) {
181 retval = set_undo_io_backing_manager(*io_ptr);
182 if (retval)
183 goto err;
184 *io_ptr = undo_io_manager;
185 retval = set_undo_io_backup_file(undo_file);
186 if (retval)
187 goto err;
188 printf(_("Overwriting existing filesystem; this can be undone "
189 "using the command:\n"
190 " e2undo %s %s\n\n"),
191 undo_file, device);
192 return retval;
193 }
194
195 /*
196 * Configuration via a conf file would be
197 * nice
198 */
199 tdb_dir = getenv("E2FSPROGS_UNDO_DIR");
200 if (!tdb_dir)
201 tdb_dir = "/var/lib/e2fsprogs";
202
203 if (!strcmp(tdb_dir, "none") || (tdb_dir[0] == 0) ||
204 access(tdb_dir, W_OK))
205 return 0;
206
207 tmp_name = strdup(device);
208 if (!tmp_name)
209 goto errout;
210 dev_name = basename(tmp_name);
211 tdb_file = malloc(strlen(tdb_dir) + 11 + strlen(dev_name) + 7 + 1);
212 if (!tdb_file) {
213 free(tmp_name);
214 goto errout;
215 }
216 sprintf(tdb_file, "%s/resize2fs-%s.e2undo", tdb_dir, dev_name);
217 free(tmp_name);
218
219 if ((unlink(tdb_file) < 0) && (errno != ENOENT)) {
220 retval = errno;
221 com_err(program_name, retval,
222 _("while trying to delete %s"), tdb_file);
223 goto errout;
224 }
225
226 retval = set_undo_io_backing_manager(*io_ptr);
227 if (retval)
228 goto errout;
229 *io_ptr = undo_io_manager;
230 retval = set_undo_io_backup_file(tdb_file);
231 if (retval)
232 goto errout;
233 printf(_("Overwriting existing filesystem; this can be undone "
234 "using the command:\n"
235 " e2undo %s %s\n\n"), tdb_file, device);
236
237 free(tdb_file);
238 return 0;
239 errout:
240 free(tdb_file);
241 err:
242 com_err(program_name, retval, "%s",
243 _("while trying to setup undo file\n"));
244 return retval;
245 }
246
main(int argc,char ** argv)247 int main (int argc, char ** argv)
248 {
249 errcode_t retval;
250 ext2_filsys fs;
251 int c;
252 int flags = 0;
253 int flush = 0;
254 int force = 0;
255 int io_flags = 0;
256 int force_min_size = 0;
257 int print_min_size = 0;
258 int fd, ret;
259 int open_flags = O_RDWR;
260 blk64_t new_size = 0;
261 blk64_t max_size = 0;
262 blk64_t min_size = 0;
263 io_manager io_ptr;
264 char *new_size_str = 0;
265 int use_stride = -1;
266 ext2fs_struct_stat st_buf;
267 __s64 new_file_size;
268 unsigned int sys_page_size = 4096;
269 unsigned int blocksize;
270 long sysval;
271 int len, mount_flags;
272 char *mtpt, *undo_file = NULL;
273 dgrp_t new_group_desc_count;
274 unsigned long new_desc_blocks;
275
276 #ifdef ENABLE_NLS
277 setlocale(LC_MESSAGES, "");
278 setlocale(LC_CTYPE, "");
279 bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
280 textdomain(NLS_CAT_NAME);
281 set_com_err_gettext(gettext);
282 #endif
283
284 add_error_table(&et_ext2_error_table);
285
286 fprintf (stderr, "resize2fs %s (%s)\n",
287 E2FSPROGS_VERSION, E2FSPROGS_DATE);
288 if (argc && *argv)
289 program_name = *argv;
290 else
291 usage(NULL);
292
293 while ((c = getopt(argc, argv, "d:fFhMPpS:bsz:")) != EOF) {
294 switch (c) {
295 case 'h':
296 usage(program_name);
297 break;
298 case 'f':
299 force = 1;
300 break;
301 case 'F':
302 flush = 1;
303 break;
304 case 'M':
305 force_min_size = 1;
306 break;
307 case 'P':
308 print_min_size = 1;
309 break;
310 case 'd':
311 flags |= atoi(optarg);
312 break;
313 case 'p':
314 flags |= RESIZE_PERCENT_COMPLETE;
315 break;
316 case 'S':
317 use_stride = atoi(optarg);
318 break;
319 case 'b':
320 flags |= RESIZE_ENABLE_64BIT;
321 break;
322 case 's':
323 flags |= RESIZE_DISABLE_64BIT;
324 break;
325 case 'z':
326 undo_file = optarg;
327 break;
328 default:
329 usage(program_name);
330 }
331 }
332 if (optind == argc)
333 usage(program_name);
334
335 device_name = argv[optind++];
336 if (optind < argc)
337 new_size_str = argv[optind++];
338 if (optind < argc)
339 usage(program_name);
340
341 io_options = strchr(device_name, '?');
342 if (io_options)
343 *io_options++ = 0;
344
345 /*
346 * Figure out whether or not the device is mounted, and if it is
347 * where it is mounted.
348 */
349 len=80;
350 while (1) {
351 mtpt = malloc(len);
352 if (!mtpt)
353 return ENOMEM;
354 mtpt[len-1] = 0;
355 retval = ext2fs_check_mount_point(device_name, &mount_flags,
356 mtpt, len);
357 if (retval) {
358 com_err("ext2fs_check_mount_point", retval,
359 _("while determining whether %s is mounted."),
360 device_name);
361 exit(1);
362 }
363 if (!(mount_flags & EXT2_MF_MOUNTED) || (mtpt[len-1] == 0))
364 break;
365 free(mtpt);
366 len = 2 * len;
367 }
368
369 if (print_min_size)
370 open_flags = O_RDONLY;
371
372 fd = ext2fs_open_file(device_name, open_flags, 0);
373 if (fd < 0) {
374 com_err("open", errno, _("while opening %s"),
375 device_name);
376 exit(1);
377 }
378
379 ret = ext2fs_fstat(fd, &st_buf);
380 if (ret < 0) {
381 com_err("open", errno,
382 _("while getting stat information for %s"),
383 device_name);
384 exit(1);
385 }
386
387 if (flush) {
388 retval = ext2fs_sync_device(fd, 1);
389 if (retval) {
390 com_err(argv[0], retval,
391 _("while trying to flush %s"),
392 device_name);
393 exit(1);
394 }
395 }
396
397 if (!S_ISREG(st_buf.st_mode )) {
398 close(fd);
399 fd = -1;
400 }
401
402 #ifdef CONFIG_TESTIO_DEBUG
403 if (getenv("TEST_IO_FLAGS") || getenv("TEST_IO_BLOCK")) {
404 io_ptr = test_io_manager;
405 test_io_backing_manager = unix_io_manager;
406 } else
407 #endif
408 io_ptr = unix_io_manager;
409
410 if (!(mount_flags & EXT2_MF_MOUNTED) && !print_min_size)
411 io_flags = EXT2_FLAG_RW | EXT2_FLAG_EXCLUSIVE;
412
413 io_flags |= EXT2_FLAG_64BITS | EXT2_FLAG_THREADS;
414 if (undo_file) {
415 retval = resize2fs_setup_tdb(device_name, undo_file, &io_ptr);
416 if (retval)
417 exit(1);
418 }
419 retval = ext2fs_open2(device_name, io_options, io_flags,
420 0, 0, io_ptr, &fs);
421 if (retval) {
422 com_err(program_name, retval, _("while trying to open %s"),
423 device_name);
424 printf("%s", _("Couldn't find valid filesystem superblock.\n"));
425 exit (1);
426 }
427 fs->default_bitmap_type = EXT2FS_BMAP64_RBTREE;
428
429 /*
430 * Before acting on an unmounted filesystem, make sure it's ok,
431 * unless the user is forcing it.
432 *
433 * We do ERROR and VALID checks even if we're only printing the
434 * minimum size, because traversal of a badly damaged filesystem
435 * can cause issues as well. We don't require it to be fscked after
436 * the last mount time in this case, though, as this is a bit less
437 * risky.
438 */
439 if (!force && !(mount_flags & EXT2_MF_MOUNTED)) {
440 int checkit = 0;
441
442 if (fs->super->s_state & EXT2_ERROR_FS)
443 checkit = 1;
444
445 if ((fs->super->s_state & EXT2_VALID_FS) == 0)
446 checkit = 1;
447
448 if ((fs->super->s_lastcheck < fs->super->s_mtime) &&
449 !print_min_size)
450 checkit = 1;
451
452 if ((ext2fs_free_blocks_count(fs->super) >
453 ext2fs_blocks_count(fs->super)) ||
454 (fs->super->s_free_inodes_count > fs->super->s_inodes_count))
455 checkit = 1;
456
457 if ((fs->super->s_last_orphan != 0) ||
458 ext2fs_has_feature_journal_needs_recovery(fs->super))
459 checkit = 1;
460
461 if (checkit) {
462 fprintf(stderr,
463 _("Please run 'e2fsck -f %s' first.\n\n"),
464 device_name);
465 goto errout;
466 }
467 }
468
469 /*
470 * Check for compatibility with the feature sets. We need to
471 * be more stringent than ext2fs_open().
472 */
473 if (fs->super->s_feature_compat & ~EXT2_LIB_FEATURE_COMPAT_SUPP) {
474 com_err(program_name, EXT2_ET_UNSUPP_FEATURE,
475 "(%s)", device_name);
476 goto errout;
477 }
478
479 min_size = calculate_minimum_resize_size(fs, flags);
480
481 if (print_min_size) {
482 printf(_("Estimated minimum size of the filesystem: %llu\n"),
483 (unsigned long long) min_size);
484 success_exit:
485 (void) ext2fs_close_free(&fs);
486 remove_error_table(&et_ext2_error_table);
487 exit(0);
488 }
489
490 /* Determine the system page size if possible */
491 #ifdef HAVE_SYSCONF
492 #if (!defined(_SC_PAGESIZE) && defined(_SC_PAGE_SIZE))
493 #define _SC_PAGESIZE _SC_PAGE_SIZE
494 #endif
495 #ifdef _SC_PAGESIZE
496 sysval = sysconf(_SC_PAGESIZE);
497 if (sysval > 0)
498 sys_page_size = sysval;
499 #endif /* _SC_PAGESIZE */
500 #endif /* HAVE_SYSCONF */
501
502 /*
503 * Get the size of the containing partition, and use this for
504 * defaults and for making sure the new filesystem doesn't
505 * exceed the partition size.
506 */
507 blocksize = fs->blocksize;
508 retval = ext2fs_get_device_size2(device_name, blocksize,
509 &max_size);
510 if (retval) {
511 com_err(program_name, retval, "%s",
512 _("while trying to determine filesystem size"));
513 goto errout;
514 }
515 if (force_min_size)
516 new_size = min_size;
517 else if (new_size_str) {
518 new_size = parse_num_blocks2(new_size_str,
519 fs->super->s_log_block_size);
520 if (new_size == 0) {
521 com_err(program_name, 0,
522 _("Invalid new size: %s\n"), new_size_str);
523 goto errout;
524 }
525 } else {
526 new_size = max_size;
527 /* Round down to an even multiple of a pagesize */
528 if (sys_page_size > blocksize)
529 new_size &= ~((blk64_t)((sys_page_size / blocksize)-1));
530 }
531 /* If changing 64bit, don't change the filesystem size. */
532 if (flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)) {
533 new_size = ext2fs_blocks_count(fs->super);
534 }
535 if (!ext2fs_has_feature_64bit(fs->super)) {
536 /* Take 16T down to 2^32-1 blocks */
537 if (new_size == (1ULL << 32))
538 new_size--;
539 else if (new_size > (1ULL << 32)) {
540 com_err(program_name, 0, "%s",
541 _("New size too large to be "
542 "expressed in 32 bits\n"));
543 goto errout;
544 }
545 }
546
547 /* If using cluster allocations, trim down to a cluster boundary */
548 if (ext2fs_has_feature_bigalloc(fs->super)) {
549 new_size &= ~((blk64_t)(1ULL << fs->cluster_ratio_bits) - 1);
550 }
551
552 new_group_desc_count = ext2fs_div64_ceil(new_size -
553 fs->super->s_first_data_block,
554 EXT2_BLOCKS_PER_GROUP(fs->super));
555 new_desc_blocks = ext2fs_div_ceil(new_group_desc_count,
556 EXT2_DESC_PER_BLOCK(fs->super));
557 if ((new_desc_blocks + fs->super->s_first_data_block) >
558 EXT2_BLOCKS_PER_GROUP(fs->super)) {
559 com_err(program_name, 0,
560 _("New size results in too many block group "
561 "descriptors.\n"));
562 goto errout;
563 }
564
565 if (!force && new_size < min_size) {
566 com_err(program_name, 0,
567 _("New size smaller than minimum (%llu)\n"),
568 (unsigned long long) min_size);
569 goto errout;
570 }
571 if (use_stride >= 0) {
572 if (use_stride >= (int) fs->super->s_blocks_per_group) {
573 com_err(program_name, 0, "%s",
574 _("Invalid stride length"));
575 goto errout;
576 }
577 fs->stride = fs->super->s_raid_stride = use_stride;
578 ext2fs_mark_super_dirty(fs);
579 } else
580 determine_fs_stride(fs);
581
582 /*
583 * If we are resizing a plain file, and it's not big enough,
584 * automatically extend it in a sparse fashion by writing the
585 * last requested block.
586 */
587 new_file_size = ((__u64) new_size) * blocksize;
588 if ((__u64) new_file_size >
589 (((__u64) 1) << (sizeof(st_buf.st_size)*8 - 1)) - 1)
590 fd = -1;
591 if ((new_file_size > st_buf.st_size) &&
592 (fd > 0)) {
593 if ((ext2fs_llseek(fd, new_file_size-1, SEEK_SET) >= 0) &&
594 (write(fd, "0", 1) == 1))
595 max_size = new_size;
596 }
597 if (!force && (new_size > max_size)) {
598 fprintf(stderr, _("The containing partition (or device)"
599 " is only %llu (%dk) blocks.\nYou requested a new size"
600 " of %llu blocks.\n\n"), (unsigned long long) max_size,
601 blocksize / 1024, (unsigned long long) new_size);
602 goto errout;
603 }
604 if ((flags & RESIZE_DISABLE_64BIT) && (flags & RESIZE_ENABLE_64BIT)) {
605 fprintf(stderr, _("Cannot set and unset 64bit feature.\n"));
606 goto errout;
607 } else if (flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)) {
608 if (new_size >= (1ULL << 32)) {
609 fprintf(stderr, _("Cannot change the 64bit feature "
610 "on a filesystem that is larger than "
611 "2^32 blocks.\n"));
612 goto errout;
613 }
614 if (mount_flags & EXT2_MF_MOUNTED) {
615 fprintf(stderr, _("Cannot change the 64bit feature "
616 "while the filesystem is mounted.\n"));
617 goto errout;
618 }
619 if (flags & RESIZE_ENABLE_64BIT &&
620 !ext2fs_has_feature_extents(fs->super)) {
621 fprintf(stderr, _("Please enable the extents feature "
622 "with tune2fs before enabling the 64bit "
623 "feature.\n"));
624 goto errout;
625 }
626 } else {
627 adjust_new_size(fs, &new_size);
628 if (new_size == ext2fs_blocks_count(fs->super)) {
629 fprintf(stderr, _("The filesystem is already "
630 "%llu (%dk) blocks long. "
631 "Nothing to do!\n\n"),
632 (unsigned long long) new_size,
633 blocksize / 1024);
634 goto success_exit;
635 }
636 }
637 if ((flags & RESIZE_ENABLE_64BIT) &&
638 ext2fs_has_feature_64bit(fs->super)) {
639 fprintf(stderr, _("The filesystem is already 64-bit.\n"));
640 goto success_exit;
641 }
642 if ((flags & RESIZE_DISABLE_64BIT) &&
643 !ext2fs_has_feature_64bit(fs->super)) {
644 fprintf(stderr, _("The filesystem is already 32-bit.\n"));
645 goto success_exit;
646 }
647 if (new_size < ext2fs_blocks_count(fs->super) &&
648 ext2fs_has_feature_stable_inodes(fs->super)) {
649 fprintf(stderr, _("Cannot shrink this filesystem "
650 "because it has the stable_inodes feature flag.\n"));
651 goto errout;
652 }
653 if (mount_flags & EXT2_MF_MOUNTED) {
654 retval = online_resize_fs(fs, mtpt, &new_size, flags);
655 } else {
656 bigalloc_check(fs, force);
657 if (flags & RESIZE_ENABLE_64BIT)
658 printf(_("Converting the filesystem to 64-bit.\n"));
659 else if (flags & RESIZE_DISABLE_64BIT)
660 printf(_("Converting the filesystem to 32-bit.\n"));
661 else
662 printf(_("Resizing the filesystem on "
663 "%s to %llu (%dk) blocks.\n"),
664 device_name, (unsigned long long) new_size,
665 blocksize / 1024);
666 retval = resize_fs(fs, &new_size, flags,
667 ((flags & RESIZE_PERCENT_COMPLETE) ?
668 resize_progress_func : 0));
669 }
670 free(mtpt);
671 if (retval) {
672 com_err(program_name, retval, _("while trying to resize %s"),
673 device_name);
674 fprintf(stderr,
675 _("Please run 'e2fsck -fy %s' to fix the filesystem\n"
676 "after the aborted resize operation.\n"),
677 device_name);
678 goto errout;
679 }
680 printf(_("The filesystem on %s is now %llu (%dk) blocks long.\n\n"),
681 device_name, (unsigned long long) new_size, blocksize / 1024);
682
683 if ((st_buf.st_size > new_file_size) &&
684 (fd > 0)) {
685 #ifdef HAVE_FTRUNCATE64
686 retval = ftruncate64(fd, new_file_size);
687 #else
688 retval = 0;
689 /* Only truncate if new_file_size doesn't overflow off_t */
690 if (((off_t) new_file_size) == new_file_size)
691 retval = ftruncate(fd, (off_t) new_file_size);
692 #endif
693 if (retval)
694 com_err(program_name, retval,
695 _("while trying to truncate %s"),
696 device_name);
697 }
698 if (fd > 0)
699 close(fd);
700 remove_error_table(&et_ext2_error_table);
701 return 0;
702 errout:
703 (void) ext2fs_close_free(&fs);
704 remove_error_table(&et_ext2_error_table);
705 return 1;
706 }
707