mke2fs.c in e2fsprogs

int main (int argc, char *argv[])
{
	errcode_t	retval = 0;
	ext2_filsys	fs;
	badblocks_list	bb_list = 0;
	unsigned int	journal_blocks;
	unsigned int	i, checkinterval;
	int		max_mnt_count;
	int		val, hash_alg;
	int		flags;
	int		old_bitmaps;
	io_manager	io_ptr;
	char		tdb_string[40];
	char		*hash_alg_str;
	int		itable_zeroed = 0;

#ifdef ENABLE_NLS
	setlocale(LC_MESSAGES, "");
	setlocale(LC_CTYPE, "");
	bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
	textdomain(NLS_CAT_NAME);
	set_com_err_gettext(gettext);
#endif
	PRS(argc, argv);

#ifdef CONFIG_TESTIO_DEBUG
	if (getenv("TEST_IO_FLAGS") || getenv("TEST_IO_BLOCK")) {
		io_ptr = test_io_manager;
		test_io_backing_manager = unix_io_manager;
	} else
#endif
		io_ptr = unix_io_manager;

	if (should_do_undo(device_name)) {
		retval = mke2fs_setup_tdb(device_name, &io_ptr);
		if (retval)
			exit(1);
	}

	/*
	 * Initialize the superblock....
	 */
	flags = EXT2_FLAG_EXCLUSIVE;
	profile_get_boolean(profile, "options", "old_bitmaps", 0, 0,
			    &old_bitmaps);
	if (!old_bitmaps)
		flags |= EXT2_FLAG_64BITS;
	/*
	 * By default, we print how many inode tables or block groups
	 * or whatever we've written so far.  The quiet flag disables
	 * this, along with a lot of other output.
	 */
	if (!quiet)
		flags |= EXT2_FLAG_PRINT_PROGRESS;
	retval = ext2fs_initialize(device_name, flags, &fs_param, io_ptr, &fs);
	if (retval) {
		com_err(device_name, retval, _("while setting up superblock"));
		exit(1);
	}

	/* Can't undo discard ... */
	if (!noaction && discard && (io_ptr != undo_io_manager)) {
		retval = mke2fs_discard_device(fs);
		if (!retval && io_channel_discard_zeroes_data(fs->io)) {
			if (verbose)
				printf(_("Discard succeeded and will return 0s "
					 " - skipping inode table wipe\n"));
			lazy_itable_init = 1;
			itable_zeroed = 1;
		}
	}

	sprintf(tdb_string, "tdb_data_size=%d", fs->blocksize <= 4096 ?
		32768 : fs->blocksize * 8);
	io_channel_set_options(fs->io, tdb_string);

	if (fs_param.s_flags & EXT2_FLAGS_TEST_FILESYS)
		fs->super->s_flags |= EXT2_FLAGS_TEST_FILESYS;

	if ((fs_param.s_feature_incompat &
	     (EXT3_FEATURE_INCOMPAT_EXTENTS|EXT4_FEATURE_INCOMPAT_FLEX_BG)) ||
	    (fs_param.s_feature_ro_compat &
	     (EXT4_FEATURE_RO_COMPAT_HUGE_FILE|EXT4_FEATURE_RO_COMPAT_GDT_CSUM|
	      EXT4_FEATURE_RO_COMPAT_DIR_NLINK|
	      EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)))
		fs->super->s_kbytes_written = 1;

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

	/*
	 * Parse or generate a UUID for the filesystem
	 */
	if (fs_uuid) {
		if (uuid_parse(fs_uuid, fs->super->s_uuid) !=0) {
			com_err(device_name, 0, "could not parse UUID: %s\n",
				fs_uuid);
			exit(1);
		}
	} else
		uuid_generate(fs->super->s_uuid);

	/*
	 * Initialize the directory index variables
	 */
	hash_alg_str = get_string_from_profile(fs_types, "hash_alg",
					       "half_md4");
	hash_alg = e2p_string2hash(hash_alg_str);
	free(hash_alg_str);
	fs->super->s_def_hash_version = (hash_alg >= 0) ? hash_alg :
		EXT2_HASH_HALF_MD4;
	uuid_generate((unsigned char *) fs->super->s_hash_seed);

	/*
	 * Periodic checks can be enabled/disabled via config file.
	 * Note we override the kernel include file's idea of what the default
	 * check interval (never) should be.  It's a good idea to check at
	 * least *occasionally*, specially since servers will never rarely get
	 * to reboot, since Linux is so robust these days.  :-)
	 *
	 * 180 days (six months) seems like a good value.
	 */
#ifdef EXT2_DFL_CHECKINTERVAL
#undef EXT2_DFL_CHECKINTERVAL
#endif
#define EXT2_DFL_CHECKINTERVAL (86400L * 180L)

	if (get_bool_from_profile(fs_types, "enable_periodic_fsck", 0)) {
		fs->super->s_checkinterval = EXT2_DFL_CHECKINTERVAL;
		fs->super->s_max_mnt_count = EXT2_DFL_MAX_MNT_COUNT;
		/*
		 * 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;
	} else
		fs->super->s_max_mnt_count = -1;

	/*
	 * Override the creator OS, if applicable
	 */
	if (creator_os && !set_os(fs->super, creator_os)) {
		com_err (program_name, 0, _("unknown os - %s"), creator_os);
		exit(1);
	}

	/*
	 * 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) {
		memset(fs->super->s_volume_name, 0,
		       sizeof(fs->super->s_volume_name));
		strncpy(fs->super->s_volume_name, volume_label,
			sizeof(fs->super->s_volume_name));
	}

	/*
	 * Set the last mount directory
	 */
	if (mount_dir) {
		memset(fs->super->s_last_mounted, 0,
		       sizeof(fs->super->s_last_mounted));
		strncpy(fs->super->s_last_mounted, mount_dir,
			sizeof(fs->super->s_last_mounted));
	}

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

	if (noaction)
		exit(0);

	if (fs->super->s_feature_incompat &
	    EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
		create_journal_dev(fs);
		exit(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 = fs->super->s_raid_stride;
	if (!quiet)
		printf(_("Allocating group tables: "));
	retval = ext2fs_allocate_tables(fs);
	if (retval) {
		com_err(program_name, retval,
			_("while trying to allocate filesystem tables"));
		exit(1);
	}
	if (!quiet)
		printf(_("done                            \n"));

	retval = ext2fs_convert_subcluster_bitmap(fs, &fs->block_map);
	if (retval) {
		com_err(program_name, retval,
			_("\n\twhile converting subcluster bitmap"));
		exit(1);
	}

	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) */
		blk64_t rsv = 65536 / fs->blocksize;
		blk64_t blocks = ext2fs_blocks_count(fs->super);
		blk64_t start;
		blk64_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 = ext2fs_zero_blocks2(fs, start, blocks - start,
						    &ret_blk, NULL);

		if (retval) {
			com_err(program_name, retval,
				_("while zeroing block %llu at end of filesystem"),
				ret_blk);
		}
		write_inode_tables(fs, lazy_itable_init, itable_zeroed);
		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);
			if (retval) {
				com_err("ext2fs_create_resize_inode", retval,
				_("while reserving blocks for online resize"));
				exit(1);
			}
		}
	}

	if (journal_device) {
		ext2_filsys	jfs;

		if (!force)
			check_plausibility(journal_device);
		check_mount(journal_device, force, _("journal"));

		retval = ext2fs_open(journal_device, EXT2_FLAG_RW|
				     EXT2_FLAG_JOURNAL_DEV_OK, 0,
				     fs->blocksize, unix_io_manager, &jfs);
		if (retval) {
			com_err(program_name, retval,
				_("while trying to open journal device %s\n"),
				journal_device);
			exit(1);
		}
		if (!quiet) {
			printf(_("Adding journal to device %s: "),
			       journal_device);
			fflush(stdout);
		}
		retval = ext2fs_add_journal_device(fs, jfs);
		if(retval) {
			com_err (program_name, retval,
				 _("\n\twhile trying to add journal to device %s"),
				 journal_device);
			exit(1);
		}
		if (!quiet)
			printf(_("done\n"));
		ext2fs_close(jfs);
		free(journal_device);
	} else if ((journal_size) ||
		   (fs_param.s_feature_compat &
		    EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
		journal_blocks = figure_journal_size(journal_size, fs);

		if (super_only) {
			printf(_("Skipping journal creation in super-only mode\n"));
			fs->super->s_journal_inum = EXT2_JOURNAL_INO;
			goto no_journal;
		}

		if (!journal_blocks) {
			fs->super->s_feature_compat &=
				~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
			goto no_journal;
		}
		if (!quiet) {
			printf(_("Creating journal (%u blocks): "),
			       journal_blocks);
			fflush(stdout);
		}
		retval = ext2fs_add_journal_inode(fs, journal_blocks,
						  journal_flags);
		if (retval) {
			com_err (program_name, retval,
				 _("\n\twhile trying to create journal"));
			exit(1);
		}
		if (!quiet)
			printf(_("done\n"));
	}
no_journal:
	if (!super_only &&
	    fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_MMP) {
		retval = ext2fs_mmp_init(fs);
		if (retval) {
			fprintf(stderr, _("\nError while enabling multiple "
					  "mount protection feature."));
			exit(1);
		}
		if (!quiet)
			printf(_("Multiple mount protection is enabled "
				 "with update interval %d seconds.\n"),
			       fs->super->s_mmp_update_interval);
	}

	if (EXT2_HAS_RO_COMPAT_FEATURE(&fs_param,
				       EXT4_FEATURE_RO_COMPAT_BIGALLOC))
		fix_cluster_bg_counts(fs);
	if (EXT2_HAS_RO_COMPAT_FEATURE(&fs_param,
				       EXT4_FEATURE_RO_COMPAT_QUOTA))
		create_quota_inodes(fs);

	if (!quiet)
		printf(_("Writing superblocks and "
		       "filesystem accounting information: "));
	checkinterval = fs->super->s_checkinterval;
	max_mnt_count = fs->super->s_max_mnt_count;
	retval = ext2fs_close(fs);
	if (retval) {
		fprintf(stderr,
			_("\nWarning, had trouble writing out superblocks."));
	} else if (!quiet) {
		printf(_("done\n\n"));
		if (!getenv("MKE2FS_SKIP_CHECK_MSG"))
			print_check_message(max_mnt_count, checkinterval);
	}

	remove_error_table(&et_ext2_error_table);
	remove_error_table(&et_prof_error_table);
	profile_release(profile);
	for (i=0; fs_types[i]; i++)
		free(fs_types[i]);
	free(fs_types);
	return retval;
}