2 * mke2fs.c - Make a ext2fs filesystem.
4 * Copyright (C) 1994, 1995, 1996, 1997 Theodore Ts'o.
7 * This file may be redistributed under the terms of the GNU Public
12 /* Usage: mke2fs [options] device
14 * The device may be a block device or a image of one, but this isn't
15 * enforced (but it's not much fun on a character device :-).
40 #include <sys/ioctl.h>
41 #include <sys/types.h>
45 #ifdef HAVE_LINUX_FS_H
48 #include <linux/ext2_fs.h>
49 #ifdef HAVE_LINUX_MAJOR_H
50 #include <linux/major.h>
53 #include "et/com_err.h"
54 #include "uuid/uuid.h"
55 #include "ext2fs/ext2fs.h"
56 #include "../version.h"
58 #define STRIDE_LENGTH 8
64 extern int isatty(int);
65 extern FILE *fpopen(const char *cmd, const char *mode);
67 const char * program_name = "mke2fs";
68 const char * device_name = NULL;
70 /* Command line options */
76 char *bad_blocks_filename = 0;
78 struct ext2_super_block param;
79 char *creator_os = NULL;
80 char *volume_label = NULL;
81 char *mount_dir = NULL;
83 static void usage(NOARGS)
85 fprintf(stderr, "Usage: %s [-c|-t|-l filename] [-b block-size] "
86 "[-f fragment-size]\n\t[-i bytes-per-inode] "
87 "[-m reserved-blocks-percentage] [-qvS]\n\t"
88 "[-o creator-os] [-g blocks-per-group] [-L volume-label]\n\t"
89 "[-M last-mounted-directory] device [blocks-count]\n",
94 static int log2(int arg)
106 static void check_plausibility(NOARGS)
108 #ifdef HAVE_LINUX_MAJOR_H
112 val = stat(device_name, &s);
115 printf("Could not stat %s --- %s\n", device_name,
116 error_message(errno));
118 printf("\nThe device apparently does not exist; "
119 "did yo specify it correctly?\n");
122 if(!S_ISBLK(s.st_mode)) {
123 printf("%s is not a block special device.\n", device_name);
124 printf("Proceed anyway? (y,n) ");
125 if (getchar() != 'y')
129 if ((MAJOR(s.st_rdev) == HD_MAJOR && MINOR(s.st_rdev)%64 == 0) ||
130 (MAJOR(s.st_rdev) == SCSI_DISK_MAJOR &&
131 MINOR(s.st_rdev)%16 == 0)) {
132 printf("%s is entire device, not just one partition!\n",
134 printf("Proceed anyway? (y,n) ");
135 if (getchar() != 'y')
142 static void check_mount(NOARGS)
147 retval = ext2fs_check_if_mounted(device_name, &mount_flags);
149 com_err("ext2fs_check_if_mount", retval,
150 "while determining whether %s is mounted.",
154 if (!(mount_flags & EXT2_MF_MOUNTED))
157 fprintf(stderr, "%s is mounted; will not make a filesystem here!\n",
163 * Helper function for read_bb_file and test_disk
165 static void invalid_block(ext2_filsys fs, blk_t blk)
167 printf("Bad block %u out of range; ignored.\n", blk);
172 * Reads the bad blocks list from a file
174 static void read_bb_file(ext2_filsys fs, badblocks_list *bb_list,
175 const char *bad_blocks_file)
180 f = fopen(bad_blocks_file, "r");
182 com_err("read_bad_blocks_file", errno,
183 "while trying to open %s", bad_blocks_file);
186 retval = ext2fs_read_bb_FILE(fs, f, bb_list, invalid_block);
189 com_err("ext2fs_read_bb_FILE", retval,
190 "while reading in list of bad blocks from file");
196 * Runs the badblocks program to test the disk
198 static void test_disk(ext2_filsys fs, badblocks_list *bb_list)
204 sprintf(buf, "badblocks %s%s %d", quiet ? "" : "-s ",
206 fs->super->s_blocks_count);
208 printf("Running command: %s\n", buf);
211 com_err("popen", errno,
212 "while trying run '%s'", buf);
215 retval = ext2fs_read_bb_FILE(fs, f, bb_list, invalid_block);
218 com_err("ext2fs_read_bb_FILE", retval,
219 "while processing list of bad blocks from program");
224 static void handle_bad_blocks(ext2_filsys fs, badblocks_list bb_list)
229 badblocks_iterate bb_iter;
239 * The primary superblock and group descriptors *must* be
240 * good; if not, abort.
242 must_be_good = fs->super->s_first_data_block + 1 + fs->desc_blocks;
243 for (i = fs->super->s_first_data_block; i <= must_be_good; i++) {
244 if (badblocks_list_test(bb_list, i)) {
245 fprintf(stderr, "Block %d in primary superblock/group "
246 "descriptor area bad.\n", i);
247 fprintf(stderr, "Blocks %d through %d must be good "
248 "in order to build a filesystem.\n",
249 fs->super->s_first_data_block, must_be_good);
250 fprintf(stderr, "Aborting....\n");
256 * See if any of the bad blocks are showing up in the backup
257 * superblocks and/or group descriptors. If so, issue a
258 * warning and adjust the block counts appropriately.
260 group_block = fs->super->s_first_data_block +
261 fs->super->s_blocks_per_group;
264 for (i = 1; i < fs->group_desc_count; i++) {
265 for (j=0; j < fs->desc_blocks+1; j++) {
266 if (badblocks_list_test(bb_list, group_block +
270 "Warning: the backup superblock/group descriptors at block %d contain\n"
274 group = ext2fs_group_of_blk(fs, group_block+j);
275 fs->group_desc[group].bg_free_blocks_count++;
276 fs->super->s_free_blocks_count++;
279 group_block += fs->super->s_blocks_per_group;
283 * Mark all the bad blocks as used...
285 retval = badblocks_list_iterate_begin(bb_list, &bb_iter);
287 com_err("badblocks_list_iterate_begin", retval,
288 "while marking bad blocks as used");
291 while (badblocks_list_iterate(bb_iter, &blk))
292 ext2fs_mark_block_bitmap(fs->block_map, blk);
293 badblocks_list_iterate_end(bb_iter);
296 static void write_inode_tables(ext2_filsys fs)
300 int i, j, num, count;
303 buf = malloc(fs->blocksize * STRIDE_LENGTH);
305 com_err("malloc", ENOMEM, "while allocating zeroizing buffer");
308 memset(buf, 0, fs->blocksize * STRIDE_LENGTH);
311 printf("Writing inode tables: ");
312 for (i = 0; i < fs->group_desc_count; i++) {
314 printf("%4d/%4ld", i, fs->group_desc_count);
316 blk = fs->group_desc[i].bg_inode_table;
317 num = fs->inode_blocks_per_group;
319 for (j=0; j < num; j += STRIDE_LENGTH, blk += STRIDE_LENGTH) {
320 if (num-j > STRIDE_LENGTH)
321 count = STRIDE_LENGTH;
324 retval = io_channel_write_blk(fs->io, blk, count, buf);
326 printf("Warning: could not write %d blocks "
327 "in inode table starting at %d: %s\n",
328 count, blk, error_message(retval));
331 printf("\b\b\b\b\b\b\b\b\b");
338 static void create_root_dir(ext2_filsys fs)
341 struct ext2_inode inode;
343 retval = ext2fs_mkdir(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, 0);
345 com_err("ext2fs_mkdir", retval, "while creating root dir");
349 retval = ext2fs_read_inode(fs, EXT2_ROOT_INO, &inode);
351 com_err("ext2fs_read_inode", retval,
352 "while reading root inode");
355 inode.i_uid = getuid();
357 inode.i_gid = getgid();
358 retval = ext2fs_write_inode(fs, EXT2_ROOT_INO, &inode);
360 com_err("ext2fs_write_inode", retval,
361 "while setting root inode ownership");
367 static void create_lost_and_found(ext2_filsys fs)
371 const char *name = "lost+found";
374 retval = ext2fs_mkdir(fs, EXT2_ROOT_INO, 0, name);
376 com_err("ext2fs_mkdir", retval, "while creating /lost+found");
380 retval = ext2fs_lookup(fs, EXT2_ROOT_INO, name, strlen(name), 0, &ino);
382 com_err("ext2_lookup", retval, "while looking up /lost+found");
386 for (i=1; i < EXT2_NDIR_BLOCKS; i++) {
387 retval = ext2fs_expand_dir(fs, ino);
389 com_err("ext2fs_expand_dir", retval,
390 "while expanding /lost+found");
396 static void create_bad_block_inode(ext2_filsys fs, badblocks_list bb_list)
400 ext2fs_mark_inode_bitmap(fs->inode_map, EXT2_BAD_INO);
401 fs->group_desc[0].bg_free_inodes_count--;
402 fs->super->s_free_inodes_count--;
403 retval = ext2fs_update_bb_inode(fs, bb_list);
405 com_err("ext2fs_update_bb_inode", retval,
406 "while setting bad block inode");
412 static void reserve_inodes(ext2_filsys fs)
417 for (i = EXT2_ROOT_INO + 1; i < EXT2_FIRST_INODE(fs->super); i++) {
418 ext2fs_mark_inode_bitmap(fs->inode_map, i);
419 group = ext2fs_group_of_ino(fs, i);
420 fs->group_desc[group].bg_free_inodes_count--;
421 fs->super->s_free_inodes_count--;
423 ext2fs_mark_ib_dirty(fs);
427 static void zap_bootblock(ext2_filsys fs)
434 retval = io_channel_write_blk(fs->io, 0, -512, buf);
436 printf("Warning: could not erase block 0: %s\n",
437 error_message(retval));
442 static void show_stats(ext2_filsys fs)
444 struct ext2fs_sb *s = (struct ext2fs_sb *) fs->super;
449 if (param.s_blocks_count != s->s_blocks_count)
450 printf("warning: %d blocks unused.\n\n",
451 param.s_blocks_count - s->s_blocks_count);
453 switch (fs->super->s_creator_os) {
454 case EXT2_OS_LINUX: printf ("Linux"); break;
455 case EXT2_OS_HURD: printf ("GNU/hurd"); break;
456 case EXT2_OS_MASIX: printf ("Masix"); break;
457 default: printf ("(unknown os)");
459 printf (" ext2 filesystem format\n");
460 memset(buf, 0, sizeof(buf));
461 strncpy(buf, s->s_volume_name, sizeof(s->s_volume_name));
462 printf("Filesystem label=%s\n", buf);
463 printf("%u inodes, %u blocks\n", s->s_inodes_count,
465 printf("%u blocks (%2.2f%%) reserved for the super user\n",
467 100.0 * s->s_r_blocks_count / s->s_blocks_count);
468 printf("First data block=%u\n", s->s_first_data_block);
469 printf("Block size=%u (log=%u)\n", fs->blocksize,
470 s->s_log_block_size);
471 printf("Fragment size=%u (log=%u)\n", fs->fragsize,
473 printf("%lu block group%s\n", fs->group_desc_count,
474 (fs->group_desc_count > 1) ? "s" : "");
475 printf("%u blocks per group, %u fragments per group\n",
476 s->s_blocks_per_group, s->s_frags_per_group);
477 printf("%u inodes per group\n", s->s_inodes_per_group);
479 if (fs->group_desc_count == 1) {
484 printf("Superblock backups stored on blocks: ");
485 group_block = s->s_first_data_block;
487 for (i = 1; i < fs->group_desc_count; i++) {
488 group_block += s->s_blocks_per_group;
489 if (!ext2fs_bg_has_super(fs, i))
495 printf("%u", group_block);
496 if (i != fs->group_desc_count - 1)
502 #ifndef HAVE_STRCASECMP
503 static int strcasecmp (char *s1, char *s2)
506 int ch1 = *s1++, ch2 = *s2++;
514 return *s1 ? 1 : *s2 ? -1 : 0;
519 * Set the S_CREATOR_OS field. Return true if OS is known,
522 static int set_os(struct ext2_super_block *sb, char *os)
525 sb->s_creator_os = atoi (os);
526 else if (strcasecmp(os, "linux") == 0)
527 sb->s_creator_os = EXT2_OS_LINUX;
528 else if (strcasecmp(os, "GNU") == 0 || strcasecmp(os, "hurd") == 0)
529 sb->s_creator_os = EXT2_OS_HURD;
530 else if (strcasecmp(os, "masix") == 0)
531 sb->s_creator_os = EXT2_OS_MASIX;
537 #define PATH_SET "PATH=/sbin"
539 static void PRS(int argc, char *argv[])
545 int inode_ratio = 4096;
546 int reserved_ratio = 5;
548 int sparse_option = -1;
549 char *oldpath = getenv("PATH");
550 struct ext2fs_sb *param_ext2 = (struct ext2fs_sb *) ¶m;
552 /* Update our PATH to include /sbin */
556 newpath = malloc(sizeof (PATH_SET) + 1 + strlen (oldpath));
557 strcpy (newpath, PATH_SET);
558 strcat (newpath, ":");
559 strcat (newpath, oldpath);
564 setbuf(stdout, NULL);
565 setbuf(stderr, NULL);
566 initialize_ext2_error_table();
567 memset(¶m, 0, sizeof(struct ext2_super_block));
568 #ifdef EXT2_DYNAMIC_REV
569 param.s_rev_level = EXT2_DYNAMIC_REV;
572 fprintf (stderr, "mke2fs %s, %s for EXT2 FS %s, %s\n",
573 E2FSPROGS_VERSION, E2FSPROGS_DATE,
574 EXT2FS_VERSION, EXT2FS_DATE);
576 program_name = *argv;
577 while ((c = getopt (argc, argv,
578 "b:cf:g:i:l:m:o:qr:s:tvI:SFL:M:")) != EOF)
581 size = strtoul(optarg, &tmp, 0);
582 if (size < 1024 || size > 4096 || *tmp) {
583 com_err(program_name, 0, "bad block size - %s",
587 param.s_log_block_size =
588 log2(size >> EXT2_MIN_BLOCK_LOG_SIZE);
592 case 't': /* Check for bad blocks */
596 size = strtoul(optarg, &tmp, 0);
597 if (size < 1024 || size > 4096 || *tmp) {
598 com_err(program_name, 0, "bad fragment size - %s",
602 param.s_log_frag_size =
603 log2(size >> EXT2_MIN_BLOCK_LOG_SIZE);
604 printf("Warning: fragments not supported. "
605 "Ignoring -f option\n");
608 param.s_blocks_per_group = strtoul(optarg, &tmp, 0);
610 com_err(program_name, 0,
611 "Illegal number for blocks per group");
614 if ((param.s_blocks_per_group % 8) != 0) {
615 com_err(program_name, 0,
616 "blocks per group must be multiple of 8");
621 inode_ratio = strtoul(optarg, &tmp, 0);
622 if (inode_ratio < 1024 || inode_ratio > 256 * 1024 ||
624 com_err(program_name, 0, "bad inode ratio - %s",
630 bad_blocks_filename = malloc(strlen(optarg)+1);
631 if (!bad_blocks_filename) {
632 com_err(program_name, ENOMEM,
633 "in malloc for bad_blocks_filename");
636 strcpy(bad_blocks_filename, optarg);
639 reserved_ratio = strtoul(optarg, &tmp, 0);
640 if (reserved_ratio > 50 || *tmp) {
641 com_err(program_name, 0,
642 "bad reserved blocks percent - %s",
651 param.s_rev_level = atoi(optarg);
654 sparse_option = atoi(optarg);
656 #ifdef EXT2_DYNAMIC_REV
658 param.s_inode_size = atoi(optarg);
671 volume_label = optarg;
684 device_name = argv[optind];
687 param.s_blocks_count = strtoul(argv[optind++], &tmp, 0);
689 com_err(program_name, 0, "bad blocks count - %s",
698 check_plausibility();
701 param.s_log_frag_size = param.s_log_block_size;
703 if (!param.s_blocks_count) {
704 retval = ext2fs_get_device_size(device_name,
705 EXT2_BLOCK_SIZE(¶m),
706 ¶m.s_blocks_count);
708 com_err(program_name, retval,
709 "while trying to determine filesystem size");
714 if (param.s_blocks_per_group) {
715 if (param.s_blocks_per_group < 256 ||
716 param.s_blocks_per_group > max || *tmp) {
717 com_err(program_name, 0,
718 "blocks per group count out of range");
724 * Calculate number of inodes based on the inode ratio
726 param.s_inodes_count =
727 ((long long) param.s_blocks_count * EXT2_BLOCK_SIZE(¶m))
731 * Calculate number of blocks to reserve
733 param.s_r_blocks_count = (param.s_blocks_count * reserved_ratio) / 100;
736 * If we are using revision #1, use the sparse super feature
739 #ifdef EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER
740 if ((sparse_option == 1)
741 #ifdef EXT2_DYNAMIC_REV
742 || (param.s_rev_level >= EXT2_DYNAMIC_REV) && (!sparse_option)
745 param_ext2->s_feature_ro_compat |=
746 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
750 int main (int argc, char *argv[])
752 errcode_t retval = 0;
754 badblocks_list bb_list = 0;
760 * Initialize the superblock....
762 retval = ext2fs_initialize(device_name, 0, ¶m,
763 unix_io_manager, &fs);
765 com_err(device_name, retval, "while setting up superblock");
770 * Generate a UUID for it...
772 s = (struct ext2fs_sb *) fs->super;
773 uuid_generate(s->s_uuid);
776 * Override the creator OS, if applicable
778 if (creator_os && !set_os(fs->super, creator_os)) {
779 com_err (program_name, 0, "unknown os - %s", creator_os);
784 * Set the volume label...
787 memset(s->s_volume_name, 0, sizeof(s->s_volume_name));
788 strncpy(s->s_volume_name, volume_label,
789 sizeof(s->s_volume_name));
793 * Set the last mount directory
796 memset(s->s_last_mounted, 0, sizeof(s->s_last_mounted));
797 strncpy(s->s_last_mounted, mount_dir,
798 sizeof(s->s_last_mounted));
804 if (bad_blocks_filename)
805 read_bb_file(fs, &bb_list, bad_blocks_filename);
807 test_disk(fs, &bb_list);
809 handle_bad_blocks(fs, bb_list);
810 retval = ext2fs_allocate_tables(fs);
812 com_err(program_name, retval,
813 "while trying to allocate filesystem tables");
817 fs->super->s_state |= EXT2_ERROR_FS;
818 fs->flags &= ~(EXT2_FLAG_IB_DIRTY|EXT2_FLAG_BB_DIRTY);
820 write_inode_tables(fs);
822 create_lost_and_found(fs);
824 create_bad_block_inode(fs, bb_list);
831 printf("Writing superblocks and "
832 "filesystem accounting information: ");