mirror of https://github.com/vitalif/e2fsprogs
614 lines
14 KiB
C
614 lines
14 KiB
C
/*
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* mke2fs.c - Make a ext2fs filesystem.
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*
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* Copyright (C) 1994 Theodore Ts'o. This file may be redistributed
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* under the terms of the GNU Public License.
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*/
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/* Usage: mke2fs [options] device
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*
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* The device may be a block device or a image of one, but this isn't
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* enforced (but it's not much fun on a character device :-).
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*/
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#include <string.h>
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#include <fcntl.h>
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#include <ctype.h>
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#include <termios.h>
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#include <time.h>
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#include <getopt.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <mntent.h>
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#include <malloc.h>
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#include <sys/ioctl.h>
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#include <linux/ext2_fs.h>
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#include <linux/fs.h>
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#include "et/com_err.h"
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#include "ext2fs/ext2fs.h"
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#include "../version.h"
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#define STRIDE_LENGTH 8
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extern int isatty(int);
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const char * program_name = "mke2fs";
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const char * device_name = NULL;
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/* Command line options */
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int cflag = 0;
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int verbose = 0;
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int quiet = 0;
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char *bad_blocks_filename = 0;
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struct ext2_super_block param;
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static void usage(NOARGS)
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{
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fprintf(stderr,
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"Usage: %s [-c|-t|-l filename] [-b block-size] "
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"[-f fragment-size]\n\t[-i bytes-per-inode] "
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"[-m reserved-blocks-percentage] [-v]\n"
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"\tdevice [blocks-count]\n",
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program_name);
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exit(1);
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}
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static int log2(int arg)
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{
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int l = 0;
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arg >>= 1;
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while (arg) {
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l++;
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arg >>= 1;
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}
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return l;
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}
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static long valid_offset (int fd, int offset)
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{
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char ch;
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if (lseek (fd, offset, 0) < 0)
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return 0;
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if (read (fd, &ch, 1) < 1)
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return 0;
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return 1;
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}
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static int count_blocks (int fd)
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{
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int high, low;
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low = 0;
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for (high = 1; valid_offset (fd, high); high *= 2)
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low = high;
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while (low < high - 1)
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{
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const int mid = (low + high) / 2;
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if (valid_offset (fd, mid))
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low = mid;
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else
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high = mid;
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}
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valid_offset (fd, 0);
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return (low + 1) / 1024;
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}
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static int get_size(const char *file)
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{
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int fd;
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int size;
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fd = open(file, O_RDWR);
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if (fd < 0) {
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com_err("open", errno, "while trying to determine size of %s",
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file);
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exit(1);
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}
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if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
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close(fd);
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return size / (EXT2_BLOCK_SIZE(¶m) / 512);
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}
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size = count_blocks(fd);
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close(fd);
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return size;
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}
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static void check_mount(NOARGS)
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{
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FILE * f;
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struct mntent * mnt;
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if ((f = setmntent (MOUNTED, "r")) == NULL)
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return;
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while ((mnt = getmntent (f)) != NULL)
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if (strcmp (device_name, mnt->mnt_fsname) == 0)
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break;
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endmntent (f);
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if (!mnt)
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return;
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fprintf(stderr, "%s is mounted; will not make a filesystem here!\n",
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device_name);
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exit(1);
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}
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/*
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* Helper function for read_bb_file and test_disk
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*/
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static void invalid_block(ext2_filsys fs, blk_t blk)
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{
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printf("Bad block %lu out of range; ignored.\n", blk);
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return;
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}
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/*
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* Reads the bad blocks list from a file
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*/
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static void read_bb_file(ext2_filsys fs, badblocks_list *bb_list,
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const char *bad_blocks_file)
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{
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FILE *f;
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errcode_t retval;
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f = fopen(bad_blocks_file, "r");
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if (!f) {
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com_err("read_bad_blocks_file", errno,
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"while trying to open %s", bad_blocks_file);
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exit(1);
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}
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retval = ext2fs_read_bb_FILE(fs, f, bb_list, invalid_block);
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fclose (f);
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if (retval) {
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com_err("ext2fs_read_bb_FILE", retval,
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"while reading in list of bad blocks from file");
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exit(1);
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}
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}
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/*
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* Runs the badblocks program to test the disk
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*/
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static void test_disk(ext2_filsys fs, badblocks_list *bb_list)
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{
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FILE *f;
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errcode_t retval;
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char buf[1024];
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sprintf(buf, "badblocks %s%s %ld", quiet ? "" : "-s ",
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fs->device_name,
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fs->super->s_blocks_count);
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if (verbose)
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printf("Running command: %s\n", buf);
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f = popen(buf, "r");
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if (!f) {
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com_err("popen", errno,
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"while trying run '%s'", buf);
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exit(1);
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}
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retval = ext2fs_read_bb_FILE(fs, f, bb_list, invalid_block);
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fclose (f);
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if (retval) {
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com_err("ext2fs_read_bb_FILE", retval,
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"while processing list of bad blocks from program");
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exit(1);
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}
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}
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static void handle_bad_blocks(ext2_filsys fs, badblocks_list bb_list)
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{
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int i;
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int must_be_good;
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blk_t blk;
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badblocks_iterate bb_iter;
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errcode_t retval;
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if (!bb_list)
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return;
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/*
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* The primary superblock and group descriptors *must* be
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* good; if not, abort.
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*/
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must_be_good = fs->super->s_first_data_block + 1 + fs->desc_blocks;
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for (i = fs->super->s_first_data_block; i <= must_be_good; i++) {
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if (badblocks_list_test(bb_list, i)) {
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fprintf(stderr, "Block %d in primary superblock/group "
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"descriptor area bad.\n", i);
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fprintf(stderr, "Blocks %ld through %d must be good "
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"in order to build a filesystem.\n",
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fs->super->s_first_data_block, must_be_good);
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fprintf(stderr, "Aborting....\n");
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exit(1);
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}
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}
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/*
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* Mark all the bad blocks as used...
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*/
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retval = badblocks_list_iterate_begin(bb_list, &bb_iter);
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if (retval) {
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com_err("badblocks_list_iterate_begin", retval,
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"while marking bad blocks as used");
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exit(1);
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}
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while (badblocks_list_iterate(bb_iter, &blk))
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ext2fs_mark_block_bitmap(fs, fs->block_map, blk);
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badblocks_list_iterate_end(bb_iter);
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}
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static void new_table_block(ext2_filsys fs, blk_t first_block,
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const char *name, int num, const char *buf,
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blk_t *new_block)
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{
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errcode_t retval;
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blk_t blk;
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int i;
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int count;
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retval = ext2fs_get_free_blocks(fs, first_block,
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first_block + fs->super->s_blocks_per_group,
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num, fs->block_map, new_block);
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if (retval) {
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printf("Could not allocate %d block(s) for %s: %s\n",
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num, name, error_message(retval));
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ext2fs_unmark_valid(fs);
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return;
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}
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blk = *new_block;
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for (i=0; i < num; i += STRIDE_LENGTH, blk += STRIDE_LENGTH) {
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if (num-i > STRIDE_LENGTH)
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count = STRIDE_LENGTH;
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else
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count = num - i;
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retval = io_channel_write_blk(fs->io, blk, count, buf);
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if (retval)
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printf("Warning: could not write %d blocks starting "
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"at %ld for %s: %s\n",
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count, blk, name, error_message(retval));
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}
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blk = *new_block;
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for (i = 0; i < num; i++, blk++)
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ext2fs_mark_block_bitmap(fs, fs->block_map, blk);
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}
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static void alloc_tables(ext2_filsys fs)
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{
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blk_t group_blk;
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int i;
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char *buf;
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int numblocks;
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buf = malloc(fs->blocksize * STRIDE_LENGTH);
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if (!buf) {
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com_err("malloc", ENOMEM, "while allocating zeroizing buffer");
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exit(1);
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}
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memset(buf, 0, fs->blocksize * STRIDE_LENGTH);
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group_blk = fs->super->s_first_data_block;
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if (!quiet)
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printf("Writing inode tables: ");
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for (i = 0; i < fs->group_desc_count; i++) {
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if (!quiet)
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printf("%4d/%4ld", i, fs->group_desc_count);
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new_table_block(fs, group_blk, "block bitmap", 1, buf,
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&fs->group_desc[i].bg_block_bitmap);
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new_table_block(fs, group_blk, "inode bitmap", 1, buf,
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&fs->group_desc[i].bg_inode_bitmap);
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new_table_block(fs, group_blk, "inode table",
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fs->inode_blocks_per_group, buf,
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&fs->group_desc[i].bg_inode_table);
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if (i == fs->group_desc_count-1) {
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numblocks = (fs->super->s_blocks_count -
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fs->super->s_first_data_block) %
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fs->super->s_blocks_per_group;
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if (!numblocks)
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numblocks = fs->super->s_blocks_per_group;
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} else
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numblocks = fs->super->s_blocks_per_group;
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numblocks -= 3 + fs->desc_blocks + fs->inode_blocks_per_group;
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fs->group_desc[i].bg_free_blocks_count = numblocks;
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fs->group_desc[i].bg_free_inodes_count =
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fs->super->s_inodes_per_group;
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fs->group_desc[i].bg_used_dirs_count = 0;
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group_blk += fs->super->s_blocks_per_group;
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if (!quiet)
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printf("\b\b\b\b\b\b\b\b\b");
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}
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if (!quiet)
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printf("done \n");
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}
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static void create_root_dir(ext2_filsys fs)
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{
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errcode_t retval;
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retval = ext2fs_mkdir(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, 0);
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if (retval) {
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com_err("ext2fs_mkdir", retval, "while creating root dir");
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exit(1);
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}
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}
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static void create_lost_and_found(ext2_filsys fs)
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{
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errcode_t retval;
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ino_t ino;
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const char *name = "lost+found";
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int i;
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retval = ext2fs_mkdir(fs, EXT2_ROOT_INO, 0, name);
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if (retval) {
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com_err("ext2fs_mkdir", retval, "while creating /lost+found");
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exit(1);
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}
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retval = ext2fs_lookup(fs, EXT2_ROOT_INO, name, strlen(name), 0, &ino);
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if (retval) {
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com_err("ext2_lookup", retval, "while looking up /lost+found");
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exit(1);
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}
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for (i=1; i < EXT2_NDIR_BLOCKS; i++) {
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retval = ext2fs_expand_dir(fs, ino);
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if (retval) {
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com_err("ext2fs_expand_dir", retval,
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"while expanding /lost+found");
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exit(1);
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}
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}
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}
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static void create_bad_block_inode(ext2_filsys fs, badblocks_list bb_list)
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{
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errcode_t retval;
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ext2fs_mark_inode_bitmap(fs, fs->inode_map, EXT2_BAD_INO);
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fs->group_desc[0].bg_free_inodes_count--;
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fs->super->s_free_inodes_count--;
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retval = ext2fs_update_bb_inode(fs, bb_list);
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if (retval) {
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com_err("ext2fs_update_bb_inode", retval,
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"while setting bad block inode");
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exit(1);
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}
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}
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static void reserve_inodes(ext2_filsys fs)
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{
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ino_t i;
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int group;
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for (i = EXT2_ROOT_INO + 1; i < EXT2_FIRST_INO; i++) {
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ext2fs_mark_inode_bitmap (fs, fs->inode_map, i);
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group = ext2fs_group_of_ino(fs, i);
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fs->group_desc[group].bg_free_inodes_count--;
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fs->super->s_free_inodes_count--;
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}
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ext2fs_mark_ib_dirty(fs);
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}
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static void show_stats(ext2_filsys fs)
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{
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struct ext2_super_block *s = fs->super;
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blk_t group_block;
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int i, col_left;
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if (param.s_blocks_count != s->s_blocks_count)
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printf("warning: %ld blocks unused.\n\n",
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param.s_blocks_count - s->s_blocks_count);
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printf("%lu inodes, %lu blocks\n", s->s_inodes_count,
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s->s_blocks_count);
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printf("%lu blocks (%2.2f%%) reserved for the super user\n",
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s->s_r_blocks_count,
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100.0 * s->s_r_blocks_count / s->s_blocks_count);
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printf("First data block=%lu\n", s->s_first_data_block);
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printf("Block size=%u (log=%lu)\n", fs->blocksize,
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s->s_log_block_size);
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printf("Fragment size=%u (log=%lu)\n", fs->fragsize,
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s->s_log_frag_size);
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printf("%lu block group%s\n", fs->group_desc_count,
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(fs->group_desc_count > 1) ? "s" : "");
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printf("%lu blocks per group, %lu fragments per group\n",
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s->s_blocks_per_group, s->s_frags_per_group);
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printf("%lu inodes per group\n", s->s_inodes_per_group);
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if (fs->group_desc_count == 1) {
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printf("\n");
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return;
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}
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printf("Superblock backups stored on blocks: ");
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group_block = s->s_first_data_block;
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col_left = 0;
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for (i = 1; i < fs->group_desc_count; i++) {
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group_block += s->s_blocks_per_group;
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if (!col_left--) {
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printf("\n\t");
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col_left = 8;
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}
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printf("%lu", group_block);
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if (i != fs->group_desc_count - 1)
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printf(", ");
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}
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printf("\n\n");
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}
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static void PRS(int argc, char *argv[])
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{
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char c;
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int size;
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char * tmp;
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char *oldpath, newpath[PATH_MAX];
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int inode_ratio = 4096;
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int reserved_ratio = 5;
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/* Update our PATH to include /sbin */
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strcpy(newpath, "PATH=/sbin:");
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if ((oldpath = getenv("PATH")) != NULL)
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strcat(newpath, oldpath);
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putenv(newpath);
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setbuf(stdout, NULL);
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setbuf(stderr, NULL);
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initialize_ext2_error_table();
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memset(¶m, 0, sizeof(struct ext2_super_block));
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fprintf (stderr, "mke2fs %s, %s for EXT2 FS %s, %s\n",
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E2FSPROGS_VERSION, E2FSPROGS_DATE,
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EXT2FS_VERSION, EXT2FS_DATE);
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if (argc && *argv)
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program_name = *argv;
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while ((c = getopt (argc, argv, "b:cf:g:i:l:m:qtv")) != EOF)
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switch (c) {
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case 'b':
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size = strtoul(optarg, &tmp, 0);
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if (size < 1024 || size > 4096 || *tmp) {
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com_err(program_name, 0, "bad block size - %s",
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optarg);
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exit(1);
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}
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param.s_log_block_size =
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log2(size >> EXT2_MIN_BLOCK_LOG_SIZE);
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break;
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case 'c':
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case 't': /* Check for bad blocks */
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cflag = 1;
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break;
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case 'f':
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size = strtoul(optarg, &tmp, 0);
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if (size < 1024 || size > 4096 || *tmp) {
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com_err(program_name, 0, "bad fragment size - %s",
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optarg);
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exit(1);
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}
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param.s_log_frag_size =
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log2(size >> EXT2_MIN_BLOCK_LOG_SIZE);
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printf("Warning: fragments not supported. "
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"Ignoring -f option\n");
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break;
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case 'g':
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param.s_blocks_per_group = strtoul(optarg, &tmp, 0);
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if (param.s_blocks_per_group < 256 ||
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param.s_blocks_per_group > 8192 || *tmp) {
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com_err(program_name, 0,
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"bad blocks per group count - %s",
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optarg);
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exit(1);
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}
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break;
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case 'i':
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inode_ratio = strtoul(optarg, &tmp, 0);
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if (inode_ratio < 1024 || inode_ratio > 256 * 1024 ||
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*tmp) {
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com_err(program_name, 0, "bad inode ratio - %s",
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optarg);
|
|
exit(1);
|
|
}
|
|
break;
|
|
case 'l':
|
|
bad_blocks_filename = strdup(optarg);
|
|
break;
|
|
case 'm':
|
|
reserved_ratio = strtoul(optarg, &tmp, 0);
|
|
if (reserved_ratio > 50 || *tmp) {
|
|
com_err(program_name, 0,
|
|
"bad reserved blocks percent - %s",
|
|
optarg);
|
|
exit(1);
|
|
}
|
|
break;
|
|
case 'v':
|
|
verbose = 1;
|
|
break;
|
|
case 'q':
|
|
quiet = 1;
|
|
break;
|
|
default:
|
|
usage();
|
|
}
|
|
if (optind == argc)
|
|
usage();
|
|
device_name = argv[optind];
|
|
optind++;
|
|
if (optind < argc) {
|
|
param.s_blocks_count = strtoul(argv[optind++], &tmp, 0);
|
|
if (*tmp) {
|
|
com_err(program_name, 0, "bad blocks count - %s",
|
|
argv[optind - 1]);
|
|
exit(1);
|
|
}
|
|
}
|
|
if (optind < argc)
|
|
usage();
|
|
param.s_log_frag_size = param.s_log_block_size;
|
|
|
|
if (!param.s_blocks_count)
|
|
param.s_blocks_count = get_size(device_name);
|
|
|
|
/*
|
|
* Calculate number of inodes based on the inode ratio
|
|
*/
|
|
param.s_inodes_count =
|
|
(param.s_blocks_count * EXT2_BLOCK_SIZE(¶m)) / inode_ratio;
|
|
|
|
/*
|
|
* Calculate number of blocks to reserve
|
|
*/
|
|
param.s_r_blocks_count = (param.s_blocks_count * reserved_ratio) / 100;
|
|
}
|
|
|
|
int main (int argc, char *argv[])
|
|
{
|
|
errcode_t retval = 0;
|
|
ext2_filsys fs;
|
|
badblocks_list bb_list = 0;
|
|
|
|
PRS(argc, argv);
|
|
|
|
check_mount();
|
|
|
|
/*
|
|
* Initialize the superblock....
|
|
*/
|
|
retval = ext2fs_initialize(device_name, 0, ¶m,
|
|
unix_io_manager, &fs);
|
|
if (retval) {
|
|
com_err(device_name, retval, "while setting up superblock");
|
|
exit(1);
|
|
}
|
|
|
|
if (!quiet)
|
|
show_stats(fs);
|
|
|
|
if (bad_blocks_filename)
|
|
read_bb_file(fs, &bb_list, bad_blocks_filename);
|
|
if (cflag)
|
|
test_disk(fs, &bb_list);
|
|
|
|
handle_bad_blocks(fs, bb_list);
|
|
alloc_tables(fs);
|
|
create_root_dir(fs);
|
|
create_lost_and_found(fs);
|
|
reserve_inodes(fs);
|
|
create_bad_block_inode(fs, bb_list);
|
|
|
|
if (!quiet)
|
|
printf("Writing superblocks and "
|
|
"filesystem accounting information: ");
|
|
ext2fs_close(fs);
|
|
if (!quiet)
|
|
printf("done\n");
|
|
return 0;
|
|
}
|