1 /*
2 * mkjournal.c --- make a journal for a filesystem
3 *
4 * Copyright (C) 2000 Theodore Ts'o.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Library
8 * General Public License, version 2.
9 * %End-Header%
10 */
11
12 #include "config.h"
13 #include <stdio.h>
14 #include <string.h>
15 #include <assert.h>
16 #if HAVE_UNISTD_H
17 #include <unistd.h>
18 #endif
19 #if HAVE_ERRNO_H
20 #include <errno.h>
21 #endif
22 #include <fcntl.h>
23 #include <time.h>
24 #if HAVE_SYS_STAT_H
25 #include <sys/stat.h>
26 #endif
27 #if HAVE_SYS_TYPES_H
28 #include <sys/types.h>
29 #endif
30 #if HAVE_SYS_IOCTL_H
31 #include <sys/ioctl.h>
32 #endif
33 #if HAVE_NETINET_IN_H
34 #include <netinet/in.h>
35 #endif
36
37 #include "ext2_fs.h"
38 #include "e2p/e2p.h"
39 #include "ext2fs.h"
40
41 #include "kernel-jbd.h"
42
43 /*
44 * This function automatically sets up the journal superblock and
45 * returns it as an allocated block.
46 */
ext2fs_create_journal_superblock2(ext2_filsys fs,struct ext2fs_journal_params * jparams,int flags,char ** ret_jsb)47 errcode_t ext2fs_create_journal_superblock2(ext2_filsys fs,
48 struct ext2fs_journal_params *jparams,
49 int flags, char **ret_jsb)
50 {
51 errcode_t retval;
52 journal_superblock_t *jsb;
53
54 if (jparams->num_journal_blocks < JBD2_MIN_JOURNAL_BLOCKS)
55 return EXT2_ET_JOURNAL_TOO_SMALL;
56
57 if ((retval = ext2fs_get_mem(fs->blocksize, &jsb)))
58 return retval;
59
60 memset (jsb, 0, fs->blocksize);
61
62 jsb->s_header.h_magic = htonl(JBD2_MAGIC_NUMBER);
63 if (flags & EXT2_MKJOURNAL_V1_SUPER)
64 jsb->s_header.h_blocktype = htonl(JBD2_SUPERBLOCK_V1);
65 else
66 jsb->s_header.h_blocktype = htonl(JBD2_SUPERBLOCK_V2);
67 jsb->s_blocksize = htonl(fs->blocksize);
68 jsb->s_maxlen = htonl(jparams->num_journal_blocks + jparams->num_fc_blocks);
69 jsb->s_nr_users = htonl(1);
70 jsb->s_first = htonl(1);
71 jsb->s_sequence = htonl(1);
72 jsb->s_num_fc_blks = htonl(jparams->num_fc_blocks);
73 memcpy(jsb->s_uuid, fs->super->s_uuid, sizeof(fs->super->s_uuid));
74 /*
75 * If we're creating an external journal device, we need to
76 * adjust these fields.
77 */
78 if (ext2fs_has_feature_journal_dev(fs->super)) {
79 jsb->s_nr_users = 0;
80 jsb->s_first = htonl(ext2fs_journal_sb_start(fs->blocksize) + 1);
81 }
82
83 *ret_jsb = (char *) jsb;
84 return 0;
85 }
86
ext2fs_create_journal_superblock(ext2_filsys fs,__u32 num_blocks,int flags,char ** ret_sb)87 errcode_t ext2fs_create_journal_superblock(ext2_filsys fs, __u32 num_blocks,
88 int flags, char **ret_sb)
89 {
90 struct ext2fs_journal_params jparams;
91
92 jparams.num_journal_blocks = num_blocks;
93 jparams.num_fc_blocks = 0;
94
95 return ext2fs_create_journal_superblock2(fs, &jparams, flags, ret_sb);
96 }
97
98 /*
99 * This function writes a journal using POSIX routines. It is used
100 * for creating external journals and creating journals on live
101 * filesystems.
102 */
write_journal_file(ext2_filsys fs,char * filename,struct ext2fs_journal_params * jparams,int flags)103 static errcode_t write_journal_file(ext2_filsys fs, char *filename,
104 struct ext2fs_journal_params *jparams,
105 int flags)
106 {
107 errcode_t retval;
108 char *buf = 0;
109 int fd, ret_size;
110 blk_t i;
111
112 if ((retval = ext2fs_create_journal_superblock2(fs, jparams, flags,
113 &buf)))
114 return retval;
115
116 /* Open the device or journal file */
117 if ((fd = open(filename, O_WRONLY)) < 0) {
118 retval = errno;
119 goto errfree;
120 }
121
122 /* Write the superblock out */
123 retval = EXT2_ET_SHORT_WRITE;
124 ret_size = write(fd, buf, fs->blocksize);
125 if (ret_size < 0) {
126 retval = errno;
127 goto errout;
128 }
129 if (ret_size != (int) fs->blocksize)
130 goto errout;
131 memset(buf, 0, fs->blocksize);
132
133 if (flags & EXT2_MKJOURNAL_LAZYINIT)
134 goto success;
135
136 for (i = 1; i < jparams->num_journal_blocks + jparams->num_fc_blocks; i++) {
137 ret_size = write(fd, buf, fs->blocksize);
138 if (ret_size < 0) {
139 retval = errno;
140 goto errout;
141 }
142 if (ret_size != (int) fs->blocksize)
143 goto errout;
144 }
145
146 success:
147 retval = 0;
148 errout:
149 close(fd);
150 errfree:
151 ext2fs_free_mem(&buf);
152 return retval;
153 }
154
155 /*
156 * Convenience function which zeros out _num_ blocks starting at
157 * _blk_. In case of an error, the details of the error is returned
158 * via _ret_blk_ and _ret_count_ if they are non-NULL pointers.
159 * Returns 0 on success, and an error code on an error.
160 *
161 * As a special case, if the first argument is NULL, then it will
162 * attempt to free the static zeroizing buffer. (This is to keep
163 * programs that check for memory leaks happy.)
164 */
165 #define MAX_STRIDE_LENGTH (4194304 / (int) fs->blocksize)
ext2fs_zero_blocks2(ext2_filsys fs,blk64_t blk,int num,blk64_t * ret_blk,int * ret_count)166 errcode_t ext2fs_zero_blocks2(ext2_filsys fs, blk64_t blk, int num,
167 blk64_t *ret_blk, int *ret_count)
168 {
169 int j, count;
170 static void *buf;
171 static int stride_length;
172 errcode_t retval;
173
174 /* If fs is null, clean up the static buffer and return */
175 if (!fs) {
176 if (buf) {
177 free(buf);
178 buf = 0;
179 stride_length = 0;
180 }
181 return 0;
182 }
183
184 /* Deal with zeroing less than 1 block */
185 if (num <= 0)
186 return 0;
187
188 /* Try a zero out command, if supported */
189 retval = io_channel_zeroout(fs->io, blk, num);
190 if (retval == 0)
191 return 0;
192
193 /* Allocate the zeroizing buffer if necessary */
194 if (num > stride_length && stride_length < MAX_STRIDE_LENGTH) {
195 void *p;
196 int new_stride = num;
197
198 if (new_stride > MAX_STRIDE_LENGTH)
199 new_stride = MAX_STRIDE_LENGTH;
200 p = realloc(buf, fs->blocksize * new_stride);
201 if (!p)
202 return EXT2_ET_NO_MEMORY;
203 buf = p;
204 stride_length = new_stride;
205 memset(buf, 0, fs->blocksize * stride_length);
206 }
207 /* OK, do the write loop */
208 j=0;
209 while (j < num) {
210 if (blk % stride_length) {
211 count = stride_length - (blk % stride_length);
212 if (count > (num - j))
213 count = num - j;
214 } else {
215 count = num - j;
216 if (count > stride_length)
217 count = stride_length;
218 }
219 retval = io_channel_write_blk64(fs->io, blk, count, buf);
220 if (retval) {
221 if (ret_count)
222 *ret_count = count;
223 if (ret_blk)
224 *ret_blk = blk;
225 return retval;
226 }
227 j += count; blk += count;
228 }
229 return 0;
230 }
231
ext2fs_zero_blocks(ext2_filsys fs,blk_t blk,int num,blk_t * ret_blk,int * ret_count)232 errcode_t ext2fs_zero_blocks(ext2_filsys fs, blk_t blk, int num,
233 blk_t *ret_blk, int *ret_count)
234 {
235 blk64_t ret_blk2;
236 errcode_t retval;
237
238 retval = ext2fs_zero_blocks2(fs, blk, num, &ret_blk2, ret_count);
239 if (retval)
240 *ret_blk = (blk_t) ret_blk2;
241 return retval;
242 }
243
244 /*
245 * Calculate the initial goal block to be roughly at the middle of the
246 * filesystem. Pick a group that has the largest number of free
247 * blocks.
248 */
get_midpoint_journal_block(ext2_filsys fs)249 static blk64_t get_midpoint_journal_block(ext2_filsys fs)
250 {
251 dgrp_t group, start, end, i, log_flex;
252
253 group = ext2fs_group_of_blk2(fs, (ext2fs_blocks_count(fs->super) -
254 fs->super->s_first_data_block) / 2);
255 log_flex = 1 << fs->super->s_log_groups_per_flex;
256 if (fs->super->s_log_groups_per_flex && (group > log_flex)) {
257 group = group & ~(log_flex - 1);
258 while ((group < fs->group_desc_count) &&
259 ext2fs_bg_free_blocks_count(fs, group) == 0)
260 group++;
261 if (group == fs->group_desc_count)
262 group = 0;
263 start = group;
264 } else
265 start = (group > 0) ? group-1 : group;
266 end = ((group+1) < fs->group_desc_count) ? group+1 : group;
267 group = start;
268 for (i = start + 1; i <= end; i++)
269 if (ext2fs_bg_free_blocks_count(fs, i) >
270 ext2fs_bg_free_blocks_count(fs, group))
271 group = i;
272 return ext2fs_group_first_block2(fs, group);
273 }
274
275 /*
276 * This function creates a journal using direct I/O routines.
277 */
write_journal_inode(ext2_filsys fs,ext2_ino_t journal_ino,struct ext2fs_journal_params * jparams,blk64_t goal,int flags)278 static errcode_t write_journal_inode(ext2_filsys fs, ext2_ino_t journal_ino,
279 struct ext2fs_journal_params *jparams,
280 blk64_t goal, int flags)
281 {
282 char *buf;
283 errcode_t retval;
284 struct ext2_inode inode;
285 unsigned long long inode_size;
286 int falloc_flags = EXT2_FALLOCATE_FORCE_INIT;
287 blk64_t zblk;
288
289 if ((retval = ext2fs_create_journal_superblock2(fs, jparams, flags,
290 &buf)))
291 return retval;
292
293 if ((retval = ext2fs_read_bitmaps(fs)))
294 goto out2;
295
296 if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))
297 goto out2;
298
299 if (inode.i_blocks > 0) {
300 retval = EEXIST;
301 goto out2;
302 }
303
304 if (goal == ~0ULL)
305 goal = get_midpoint_journal_block(fs);
306
307 if (ext2fs_has_feature_extents(fs->super))
308 inode.i_flags |= EXT4_EXTENTS_FL;
309
310 if (!(flags & EXT2_MKJOURNAL_LAZYINIT))
311 falloc_flags |= EXT2_FALLOCATE_ZERO_BLOCKS;
312
313 inode_size = (unsigned long long)fs->blocksize *
314 (jparams->num_journal_blocks + jparams->num_fc_blocks);
315 inode.i_mtime = inode.i_ctime = fs->now ? fs->now : time(0);
316 inode.i_links_count = 1;
317 inode.i_mode = LINUX_S_IFREG | 0600;
318 retval = ext2fs_inode_size_set(fs, &inode, inode_size);
319 if (retval)
320 goto out2;
321
322 retval = ext2fs_fallocate(fs, falloc_flags, journal_ino,
323 &inode, goal, 0,
324 jparams->num_journal_blocks + jparams->num_fc_blocks);
325 if (retval)
326 goto out2;
327
328 if ((retval = ext2fs_write_new_inode(fs, journal_ino, &inode)))
329 goto out2;
330
331 retval = ext2fs_bmap2(fs, journal_ino, &inode, NULL, 0, 0, NULL, &zblk);
332 if (retval)
333 goto out2;
334
335 retval = io_channel_write_blk64(fs->io, zblk, 1, buf);
336 if (retval)
337 goto out2;
338
339 memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
340 fs->super->s_jnl_blocks[15] = inode.i_size_high;
341 fs->super->s_jnl_blocks[16] = inode.i_size;
342 fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
343 ext2fs_mark_super_dirty(fs);
344
345 out2:
346 ext2fs_free_mem(&buf);
347 return retval;
348 }
349
350 /*
351 * Find a reasonable journal file size (in blocks) given the number of blocks
352 * in the filesystem. For very small filesystems, it is not reasonable to
353 * have a journal that fills more than half of the filesystem.
354 *
355 * n.b. comments assume 4k blocks
356 */
ext2fs_default_journal_size(__u64 num_blocks)357 int ext2fs_default_journal_size(__u64 num_blocks)
358 {
359 if (num_blocks < 2048)
360 return -1;
361 if (num_blocks < 32768) /* 128 MB */
362 return (1024); /* 4 MB */
363 if (num_blocks < 256*1024) /* 1 GB */
364 return (4096); /* 16 MB */
365 if (num_blocks < 512*1024) /* 2 GB */
366 return (8192); /* 32 MB */
367 if (num_blocks < 4096*1024) /* 16 GB */
368 return (16384); /* 64 MB */
369 if (num_blocks < 8192*1024) /* 32 GB */
370 return (32768); /* 128 MB */
371 if (num_blocks < 16384*1024) /* 64 GB */
372 return (65536); /* 256 MB */
373 if (num_blocks < 32768*1024) /* 128 GB */
374 return (131072); /* 512 MB */
375 return 262144; /* 1 GB */
376 }
377
ext2fs_get_journal_params(struct ext2fs_journal_params * params,ext2_filsys fs)378 errcode_t ext2fs_get_journal_params(struct ext2fs_journal_params *params,
379 ext2_filsys fs)
380 {
381 blk_t total_blks;
382 int ret;
383
384 memset(params, 0, sizeof(*params));
385 if (ext2fs_has_feature_journal_dev(fs->super)) {
386 total_blks = ext2fs_blocks_count(fs->super);
387 if (total_blks < JBD2_MIN_JOURNAL_BLOCKS)
388 return EXT2_ET_JOURNAL_TOO_SMALL;
389
390 if (!ext2fs_has_feature_fast_commit(fs->super)) {
391 params->num_journal_blocks = total_blks;
392 params->num_fc_blocks = 0;
393 return 0;
394 }
395 params->num_journal_blocks = ext2fs_blocks_count(fs->super) *
396 EXT2_JOURNAL_TO_FC_BLKS_RATIO /
397 (EXT2_JOURNAL_TO_FC_BLKS_RATIO + 1);
398 if (JBD2_MIN_JOURNAL_BLOCKS > params->num_journal_blocks)
399 params->num_journal_blocks = JBD2_MIN_JOURNAL_BLOCKS;
400 params->num_fc_blocks = total_blks - params->num_journal_blocks;
401 return 0;
402 }
403
404 ret = ext2fs_default_journal_size(ext2fs_blocks_count(fs->super));
405 if (ret < 0)
406 return EXT2_ET_JOURNAL_TOO_SMALL;
407
408 params->num_journal_blocks = ret;
409 if (ext2fs_has_feature_fast_commit(fs->super))
410 params->num_fc_blocks = params->num_journal_blocks /
411 EXT2_JOURNAL_TO_FC_BLKS_RATIO;
412 return 0;
413 }
414
ext2fs_journal_sb_start(int blocksize)415 int ext2fs_journal_sb_start(int blocksize)
416 {
417 if (blocksize == EXT2_MIN_BLOCK_SIZE)
418 return 2;
419 return 1;
420 }
421
422 /*
423 * This function adds a journal device to a filesystem
424 */
ext2fs_add_journal_device(ext2_filsys fs,ext2_filsys journal_dev)425 errcode_t ext2fs_add_journal_device(ext2_filsys fs, ext2_filsys journal_dev)
426 {
427 struct stat st;
428 errcode_t retval;
429 char buf[SUPERBLOCK_SIZE];
430 journal_superblock_t *jsb;
431 int start;
432 __u32 i, nr_users;
433
434 /* Make sure the device exists and is a block device */
435 if (stat(journal_dev->device_name, &st) < 0)
436 return errno;
437
438 if (!S_ISBLK(st.st_mode))
439 return EXT2_ET_JOURNAL_NOT_BLOCK; /* Must be a block device */
440
441 /* Get the journal superblock */
442 start = ext2fs_journal_sb_start(journal_dev->blocksize);
443 if ((retval = io_channel_read_blk64(journal_dev->io, start,
444 -SUPERBLOCK_SIZE,
445 buf)))
446 return retval;
447
448 jsb = (journal_superblock_t *) buf;
449 if ((jsb->s_header.h_magic != (unsigned) ntohl(JBD2_MAGIC_NUMBER)) ||
450 (jsb->s_header.h_blocktype != (unsigned) ntohl(JBD2_SUPERBLOCK_V2)))
451 return EXT2_ET_NO_JOURNAL_SB;
452
453 if (ntohl(jsb->s_blocksize) != (unsigned long) fs->blocksize)
454 return EXT2_ET_UNEXPECTED_BLOCK_SIZE;
455
456 /* Check and see if this filesystem has already been added */
457 nr_users = ntohl(jsb->s_nr_users);
458 if (nr_users > JBD2_USERS_MAX)
459 return EXT2_ET_CORRUPT_JOURNAL_SB;
460 for (i=0; i < nr_users; i++) {
461 if (memcmp(fs->super->s_uuid,
462 &jsb->s_users[i*16], 16) == 0)
463 break;
464 }
465 if (i >= nr_users) {
466 memcpy(&jsb->s_users[nr_users*16],
467 fs->super->s_uuid, 16);
468 jsb->s_nr_users = htonl(nr_users+1);
469 }
470
471 /* Writeback the journal superblock */
472 if ((retval = io_channel_write_blk64(journal_dev->io, start,
473 -SUPERBLOCK_SIZE, buf)))
474 return retval;
475
476 fs->super->s_journal_inum = 0;
477 fs->super->s_journal_dev = st.st_rdev;
478 memcpy(fs->super->s_journal_uuid, jsb->s_uuid,
479 sizeof(fs->super->s_journal_uuid));
480 memset(fs->super->s_jnl_blocks, 0, sizeof(fs->super->s_jnl_blocks));
481 ext2fs_set_feature_journal(fs->super);
482 ext2fs_mark_super_dirty(fs);
483 return 0;
484 }
485
486 /*
487 * This function adds a journal inode to a filesystem, using either
488 * POSIX routines if the filesystem is mounted, or using direct I/O
489 * functions if it is not.
490 */
ext2fs_add_journal_inode3(ext2_filsys fs,struct ext2fs_journal_params * jparams,blk64_t goal,int flags)491 errcode_t ext2fs_add_journal_inode3(ext2_filsys fs, struct ext2fs_journal_params *jparams,
492 blk64_t goal, int flags)
493 {
494 errcode_t retval;
495 ext2_ino_t journal_ino;
496 struct stat st;
497 char jfile[1024];
498 int mount_flags;
499 int fd = -1;
500
501 if (flags & EXT2_MKJOURNAL_NO_MNT_CHECK)
502 mount_flags = 0;
503 else if ((retval = ext2fs_check_mount_point(fs->device_name,
504 &mount_flags,
505 jfile, sizeof(jfile)-10)))
506 return retval;
507
508 if (mount_flags & EXT2_MF_MOUNTED) {
509 #if HAVE_EXT2_IOCTLS
510 int f = 0;
511 #endif
512 strcat(jfile, "/.journal");
513
514 /*
515 * If .../.journal already exists, make sure any
516 * immutable or append-only flags are cleared.
517 */
518 #if defined(HAVE_CHFLAGS) && defined(UF_NODUMP)
519 (void) chflags (jfile, 0);
520 #else
521 #if HAVE_EXT2_IOCTLS
522 fd = open(jfile, O_RDONLY);
523 if (fd >= 0) {
524 retval = ioctl(fd, EXT2_IOC_SETFLAGS, &f);
525 close(fd);
526 if (retval)
527 return errno;
528 }
529 #endif
530 #endif
531
532 /* Create the journal file */
533 if ((fd = open(jfile, O_CREAT|O_WRONLY, 0600)) < 0)
534 return errno;
535
536 /* Note that we can't do lazy journal initialization for mounted
537 * filesystems, since the zero writing is also allocating the
538 * journal blocks. We could use fallocate, but not all kernels
539 * support that, and creating a journal on a mounted ext2
540 * filesystems is extremely rare these days... Ignore it. */
541 flags &= ~EXT2_MKJOURNAL_LAZYINIT;
542
543 if ((retval = write_journal_file(fs, jfile, jparams, flags)))
544 goto errout;
545
546 /* Get inode number of the journal file */
547 if (fstat(fd, &st) < 0) {
548 retval = errno;
549 goto errout;
550 }
551
552 #if defined(HAVE_CHFLAGS) && defined(UF_NODUMP)
553 retval = fchflags (fd, UF_NODUMP|UF_IMMUTABLE);
554 #else
555 #if HAVE_EXT2_IOCTLS
556 if (ioctl(fd, EXT2_IOC_GETFLAGS, &f) < 0) {
557 retval = errno;
558 goto errout;
559 }
560 f |= EXT2_NODUMP_FL | EXT2_IMMUTABLE_FL;
561 retval = ioctl(fd, EXT2_IOC_SETFLAGS, &f);
562 #endif
563 #endif
564 if (retval) {
565 retval = errno;
566 goto errout;
567 }
568
569 if (close(fd) < 0) {
570 retval = errno;
571 fd = -1;
572 goto errout;
573 }
574 journal_ino = st.st_ino;
575 memset(fs->super->s_jnl_blocks, 0,
576 sizeof(fs->super->s_jnl_blocks));
577 } else {
578 if ((mount_flags & EXT2_MF_BUSY) &&
579 !(fs->flags & EXT2_FLAG_EXCLUSIVE)) {
580 retval = EBUSY;
581 goto errout;
582 }
583 journal_ino = EXT2_JOURNAL_INO;
584 if ((retval = write_journal_inode(fs, journal_ino,
585 jparams, goal, flags)))
586 return retval;
587 }
588
589 fs->super->s_journal_inum = journal_ino;
590 fs->super->s_journal_dev = 0;
591 memset(fs->super->s_journal_uuid, 0,
592 sizeof(fs->super->s_journal_uuid));
593 ext2fs_set_feature_journal(fs->super);
594
595 ext2fs_mark_super_dirty(fs);
596 return 0;
597 errout:
598 if (fd >= 0)
599 close(fd);
600 return retval;
601 }
602
ext2fs_add_journal_inode2(ext2_filsys fs,blk_t num_blocks,blk64_t goal,int flags)603 errcode_t ext2fs_add_journal_inode2(ext2_filsys fs, blk_t num_blocks,
604 blk64_t goal, int flags)
605 {
606 struct ext2fs_journal_params jparams;
607
608 jparams.num_journal_blocks = num_blocks;
609 jparams.num_fc_blocks = 0;
610
611 return ext2fs_add_journal_inode3(fs, &jparams, goal, flags);
612 }
613
ext2fs_add_journal_inode(ext2_filsys fs,blk_t num_blocks,int flags)614 errcode_t ext2fs_add_journal_inode(ext2_filsys fs, blk_t num_blocks, int flags)
615 {
616 return ext2fs_add_journal_inode2(fs, num_blocks, ~0ULL, flags);
617 }
618
619
620 #ifdef DEBUG
main(int argc,char ** argv)621 main(int argc, char **argv)
622 {
623 errcode_t retval;
624 char *device_name;
625 ext2_filsys fs;
626
627 if (argc < 2) {
628 fprintf(stderr, "Usage: %s filesystem\n", argv[0]);
629 exit(1);
630 }
631 device_name = argv[1];
632
633 retval = ext2fs_open (device_name, EXT2_FLAG_RW, 0, 0,
634 unix_io_manager, &fs);
635 if (retval) {
636 com_err(argv[0], retval, "while opening %s", device_name);
637 exit(1);
638 }
639
640 retval = ext2fs_add_journal_inode(fs, JBD2_MIN_JOURNAL_BLOCKS, 0);
641 if (retval) {
642 com_err(argv[0], retval, "while adding journal to %s",
643 device_name);
644 exit(1);
645 }
646 retval = ext2fs_flush(fs);
647 if (retval) {
648 printf("Warning, had trouble writing out superblocks.\n");
649 }
650 ext2fs_close_free(&fs);
651 exit(0);
652
653 }
654 #endif
655