mke2fs.c

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			noaction++;
			break;
		case 'o':
			creator_os = optarg;
			break;
		case 'r':
			param.s_rev_level = xatoi_u(optarg);
			if (param.s_rev_level == EXT2_GOOD_OLD_REV) {
				param.s_feature_incompat = 0;
				param.s_feature_compat = 0;
				param.s_feature_ro_compat = 0;
			}
			break;
		case 's':	/* deprecated */
			if (xatou(optarg))
				param.s_feature_ro_compat |=
					EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
			else
				param.s_feature_ro_compat &=
					~EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
			break;
#ifdef EXT2_DYNAMIC_REV
		case 'I':
			inode_size = xatoi_u(optarg);
			break;
#endif
		case 'N':
			num_inodes = xatoi_u(optarg);
			break;
		case 'v':
			quiet = 0;
			break;
		case 'q':
			quiet = 1;
			break;
		case 'F':
			force = 1;
			break;
		case 'L':
			volume_label = optarg;
			break;
		case 'M':
			mount_dir = optarg;
			break;
		case 'O':
			if (!strcmp(optarg, "none")) {
				param.s_feature_compat = 0;
				param.s_feature_incompat = 0;
				param.s_feature_ro_compat = 0;
				break;
			}
			if (e2p_edit_feature(optarg,
					    &param.s_feature_compat,
					    ok_features)) {
				bb_error_msg_and_die("Invalid filesystem option set: %s", optarg);
			}
			break;
		case 'E':
		case 'R':
			extended_opts = optarg;
			break;
		case 'S':
			super_only = 1;
			break;
		case 'T':
			fs_type = optarg;
			break;
		case 'V':
			/* Print version number and exit */
			show_version_only = 1;
			quiet = 0;
			break;
		default:
			bb_show_usage();
		}
	}
	if ((optind == argc) /*&& !show_version_only*/)
		bb_show_usage();
	device_name = argv[optind++];

	mke2fs_verbose("mke2fs %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);

	if (show_version_only) {
		return 0;
	}

	/*
	 * If there's no blocksize specified and there is a journal
	 * device, use it to figure out the blocksize
	 */
	if (blocksize <= 0 && journal_device) {
		ext2_filsys     jfs;
		io_manager      io_ptr;

#ifdef CONFIG_TESTIO_DEBUG
		io_ptr = test_io_manager;
		test_io_backing_manager = unix_io_manager;
#else
		io_ptr = unix_io_manager;
#endif
		retval = ext2fs_open(journal_device,
				     EXT2_FLAG_JOURNAL_DEV_OK, 0,
				     0, io_ptr, &jfs);
		mke2fs_error_msg_and_die(retval, "open journal device %s", journal_device);
		if ((blocksize < 0) && (jfs->blocksize < (unsigned) (-blocksize))) {
			bb_error_msg_and_die(
				"Journal dev blocksize (%d) smaller than "
				"minimum blocksize %d\n", jfs->blocksize,
				-blocksize);
		}
		blocksize = jfs->blocksize;
		param.s_log_block_size =
			int_log2(blocksize >> EXT2_MIN_BLOCK_LOG_SIZE);
		ext2fs_close(jfs);
	}

	if (blocksize > sys_page_size) {
		mke2fs_warning_msg(1, "%d-byte blocks too big for system (max %d)",
			blocksize, sys_page_size);
		if (!force) {
			proceed_question();
		}
		bb_error_msg("Forced to continue");
	}
	mke2fs_warning_msg(((blocksize > 4096) &&
		(param.s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)),
		"some 2.4 kernels do not support "
		"blocksizes greater than 4096 using ext3.\n"
		"Use -b 4096 if this is an issue for you\n");

	if (optind < argc) {
		param.s_blocks_count = parse_num_blocks(argv[optind++],
				param.s_log_block_size);
		mke2fs_error_msg_and_die(!param.s_blocks_count, "invalid blocks count - %s", argv[optind - 1]);
	}
	if (optind < argc)
		bb_show_usage();

	if (param.s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
		if (!fs_type)
			fs_type = "journal";
		reserved_ratio = 0;
		param.s_feature_incompat = EXT3_FEATURE_INCOMPAT_JOURNAL_DEV;
		param.s_feature_compat = 0;
		param.s_feature_ro_compat = 0;
	}
	if (param.s_rev_level == EXT2_GOOD_OLD_REV &&
	    (param.s_feature_compat || param.s_feature_ro_compat ||
	     param.s_feature_incompat))
		param.s_rev_level = 1;	/* Create a revision 1 filesystem */

	check_plausibility(device_name , force);
	check_mount(device_name, force, "filesystem");

	param.s_log_frag_size = param.s_log_block_size;

	if (noaction && param.s_blocks_count) {
		dev_size = param.s_blocks_count;
		retval = 0;
	} else {
	retry:
		retval = ext2fs_get_device_size(device_name,
						EXT2_BLOCK_SIZE(&param),
						&dev_size);
		if ((retval == EFBIG) &&
		    (blocksize == 0) &&
		    (param.s_log_block_size == 0)) {
			param.s_log_block_size = 2;
			blocksize = 4096;
			goto retry;
		}
	}

	mke2fs_error_msg_and_die((retval && (retval != EXT2_ET_UNIMPLEMENTED)),"determine filesystem size");

	if (!param.s_blocks_count) {
		if (retval == EXT2_ET_UNIMPLEMENTED) {
			mke2fs_error_msg_and_die(1,
				"determine device size; you "
				"must specify\nthe size of the "
				"filesystem");
		} else {
			if (dev_size == 0) {
				bb_error_msg_and_die(
					"Device size reported to be zero.  "
					"Invalid partition specified, or\n\t"
					"partition table wasn't reread "
					"after running fdisk, due to\n\t"
					"a modified partition being busy "
					"and in use.  You may need to reboot\n\t"
					"to re-read your partition table.\n"
				);
			}
			param.s_blocks_count = dev_size;
			if (sys_page_size > EXT2_BLOCK_SIZE(&param))
				param.s_blocks_count &= ~((sys_page_size /
							   EXT2_BLOCK_SIZE(&param))-1);
		}

	} else if (!force && (param.s_blocks_count > dev_size)) {
		bb_error_msg("Filesystem larger than apparent device size");
		proceed_question();
	}

	/*
	 * If the user asked for HAS_JOURNAL, then make sure a journal
	 * gets created.
	 */
	if ((param.s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
	    !journal_size)
		journal_size = -1;

	/* Set first meta blockgroup via an environment variable */
	/* (this is mostly for debugging purposes) */
	if ((param.s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) &&
	    ((tmp = getenv("MKE2FS_FIRST_META_BG"))))
		param.s_first_meta_bg = atoi(tmp);

	/* Get the hardware sector size, if available */
	retval = ext2fs_get_device_sectsize(device_name, &sector_size);
	mke2fs_error_msg_and_die(retval, "determine hardware sector size");

	if ((tmp = getenv("MKE2FS_DEVICE_SECTSIZE")) != NULL)
		sector_size = atoi(tmp);

	set_fs_defaults(fs_type, &param, blocksize, sector_size, &inode_ratio);
	blocksize = EXT2_BLOCK_SIZE(&param);

	if (extended_opts)
		parse_extended_opts(&param, extended_opts);

	/* Since sparse_super is the default, we would only have a problem
	 * here if it was explicitly disabled.
	 */
	if ((param.s_feature_compat & EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
	    !(param.s_feature_ro_compat&EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)) {
		bb_error_msg_and_die("reserved online resize blocks not supported "
			  "on non-sparse filesystem");
	}

	if (param.s_blocks_per_group) {
		if (param.s_blocks_per_group < 256 ||
		    param.s_blocks_per_group > 8 * (unsigned) blocksize) {
			bb_error_msg_and_die("blocks per group count out of range");
		}
	}

	if (!force && param.s_blocks_count >= (1 << 31)) {
		bb_error_msg_and_die("Filesystem too large.  No more than 2**31-1 blocks\n"
			"\t (8TB using a blocksize of 4k) are currently supported.");
	}

	if (inode_size) {
		if (inode_size < EXT2_GOOD_OLD_INODE_SIZE ||
		    inode_size > EXT2_BLOCK_SIZE(&param) ||
		    inode_size & (inode_size - 1)) {
			bb_error_msg_and_die("invalid inode size %d (min %d/max %d)",
				inode_size, EXT2_GOOD_OLD_INODE_SIZE,
				blocksize);
		}
		mke2fs_warning_msg((inode_size != EXT2_GOOD_OLD_INODE_SIZE),
			"%d-byte inodes not usable on most systems",
			inode_size);
		param.s_inode_size = inode_size;
	}

	/*
	 * Calculate number of inodes based on the inode ratio
	 */
	param.s_inodes_count = num_inodes ? num_inodes :
		((__u64) param.s_blocks_count * blocksize)
			/ inode_ratio;

	/*
	 * Calculate number of blocks to reserve
	 */
	param.s_r_blocks_count = (param.s_blocks_count * reserved_ratio) / 100;
	return 1;
}

static void mke2fs_clean_up(void)
{
	if (ENABLE_FEATURE_CLEAN_UP && journal_device) free(journal_device);
}

int mke2fs_main (int argc, char **argv);
int mke2fs_main (int argc, char **argv)
{
	errcode_t	retval;
	ext2_filsys	fs;
	badblocks_list	bb_list = 0;
	unsigned int	i;
	int		val;
	io_manager	io_ptr;

	if (ENABLE_FEATURE_CLEAN_UP)
		atexit(mke2fs_clean_up);
	if(!PRS(argc, argv))
		return 0;

#ifdef CONFIG_TESTIO_DEBUG
	io_ptr = test_io_manager;
	test_io_backing_manager = unix_io_manager;
#else
	io_ptr = unix_io_manager;
#endif

	/*
	 * Initialize the superblock....
	 */
	retval = ext2fs_initialize(device_name, 0, &param,
				   io_ptr, &fs);
	mke2fs_error_msg_and_die(retval, "set up superblock");

	/*
	 * Wipe out the old on-disk superblock
	 */
	if (!noaction)
		zap_sector(fs, 2, 6);

	/*
	 * Generate a UUID for it...
	 */
	uuid_generate(fs->super->s_uuid);

	/*
	 * Initialize the directory index variables
	 */
	fs->super->s_def_hash_version = EXT2_HASH_TEA;
	uuid_generate((unsigned char *) fs->super->s_hash_seed);

	/*
	 * Add "jitter" to the superblock's check interval so that we
	 * don't check all the filesystems at the same time.  We use a
	 * kludgy hack of using the UUID to derive a random jitter value.
	 */
	for (i = 0, val = 0; i < sizeof(fs->super->s_uuid); i++)
		val += fs->super->s_uuid[i];
	fs->super->s_max_mnt_count += val % EXT2_DFL_MAX_MNT_COUNT;

	/*
	 * Override the creator OS, if applicable
	 */
	if (creator_os && !set_os(fs->super, creator_os)) {
		bb_error_msg_and_die("unknown os - %s", creator_os);
	}

	/*
	 * For the Hurd, we will turn off filetype since it doesn't
	 * support it.
	 */
	if (fs->super->s_creator_os == EXT2_OS_HURD)
		fs->super->s_feature_incompat &=
			~EXT2_FEATURE_INCOMPAT_FILETYPE;

	/*
	 * Set the volume label...
	 */
	if (volume_label) {
		snprintf(fs->super->s_volume_name, sizeof(fs->super->s_volume_name), "%s", volume_label);
	}

	/*
	 * Set the last mount directory
	 */
	if (mount_dir) {
		snprintf(fs->super->s_last_mounted, sizeof(fs->super->s_last_mounted), "%s", mount_dir);
	}

	if (!quiet || noaction)
		show_stats(fs);

	if (noaction)
		return 0;

	if (fs->super->s_feature_incompat &
	    EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
		create_journal_dev(fs);
		return (ext2fs_close(fs) ? 1 : 0);
	}

	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);
	fs->stride = fs_stride;
	retval = ext2fs_allocate_tables(fs);
	mke2fs_error_msg_and_die(retval, "allocate filesystem tables");
	if (super_only) {
		fs->super->s_state |= EXT2_ERROR_FS;
		fs->flags &= ~(EXT2_FLAG_IB_DIRTY|EXT2_FLAG_BB_DIRTY);
	} else {
		/* rsv must be a power of two (64kB is MD RAID sb alignment) */
		unsigned int rsv = 65536 / fs->blocksize;
		unsigned long blocks = fs->super->s_blocks_count;
		unsigned long start;
		blk_t ret_blk;

#ifdef ZAP_BOOTBLOCK
		zap_sector(fs, 0, 2);
#endif

		/*
		 * Wipe out any old MD RAID (or other) metadata at the end
		 * of the device.  This will also verify that the device is
		 * as large as we think.  Be careful with very small devices.
		 */
		start = (blocks & ~(rsv - 1));
		if (start > rsv)
			start -= rsv;
		if (start > 0)
			retval = zero_blocks(fs, start, blocks - start,
					     NULL, &ret_blk, NULL);

		mke2fs_warning_msg(retval, "cannot zero block %u at end of filesystem", ret_blk);
		write_inode_tables(fs);
		create_root_dir(fs);
		create_lost_and_found(fs);
		reserve_inodes(fs);
		create_bad_block_inode(fs, bb_list);
		if (fs->super->s_feature_compat &
		    EXT2_FEATURE_COMPAT_RESIZE_INODE) {
			retval = ext2fs_create_resize_inode(fs);
			mke2fs_error_msg_and_die(retval, "reserve blocks for online resize");
		}
	}

	if (journal_device) {
		make_journal_device(journal_device, fs, quiet, force);
	} else if (journal_size) {
		make_journal_blocks(fs, journal_size, journal_flags, quiet);
	}

	mke2fs_verbose("Writing superblocks and filesystem accounting information: ");
	retval = ext2fs_flush(fs);
	mke2fs_warning_msg(retval, "had trouble writing out superblocks");
	mke2fs_verbose_done();
	if (!quiet && !getenv("MKE2FS_SKIP_CHECK_MSG"))
		print_check_message(fs);
	val = ext2fs_close(fs);
	return (retval || val) ? 1 : 0;
}