tune2fs.c

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	if (argc == 3) {
		open_flag = EXT2_FLAG_RW | EXT2_FLAG_JOURNAL_DEV_OK;
		L_flag = 1;
		new_label = argv[2];
	} else
		print_label++;
}
#else
#define parse_e2label_options(x,y)
#endif

static time_t parse_time(char *str)
{
	struct	tm	ts;

	if (strcmp(str, "now") == 0) {
		return time(0);
	}
	memset(&ts, 0, sizeof(ts));
#ifdef HAVE_STRPTIME
	strptime(str, "%Y%m%d%H%M%S", &ts);
#else
	sscanf(str, "%4d%2d%2d%2d%2d%2d", &ts.tm_year, &ts.tm_mon,
	       &ts.tm_mday, &ts.tm_hour, &ts.tm_min, &ts.tm_sec);
	ts.tm_year -= 1900;
	ts.tm_mon -= 1;
	if (ts.tm_year < 0 || ts.tm_mon < 0 || ts.tm_mon > 11 ||
	    ts.tm_mday < 0 || ts.tm_mday > 31 || ts.tm_hour > 23 ||
	    ts.tm_min > 59 || ts.tm_sec > 61)
		ts.tm_mday = 0;
#endif
	if (ts.tm_mday == 0) {
		bb_error_msg_and_die("Cannot parse date/time specifier: %s", str);
	}
	return mktime(&ts);
}

static void parse_tune2fs_options(int argc, char **argv)
{
	int c;
	char * tmp;

	printf("tune2fs %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
	while ((c = getopt(argc, argv, "c:e:fg:i:jlm:o:r:s:u:C:J:L:M:O:T:U:")) != EOF)
		switch (c)
		{
			case 'c':
				max_mount_count = xatou_range(optarg, 0, 16000);
				if (max_mount_count == 0)
					max_mount_count = -1;
				c_flag = 1;
				open_flag = EXT2_FLAG_RW;
				break;
			case 'C':
				mount_count = xatou_range(optarg, 0, 16000);
				C_flag = 1;
				open_flag = EXT2_FLAG_RW;
				break;
			case 'e':
				if (strcmp (optarg, "continue") == 0)
					errors = EXT2_ERRORS_CONTINUE;
				else if (strcmp (optarg, "remount-ro") == 0)
					errors = EXT2_ERRORS_RO;
				else if (strcmp (optarg, "panic") == 0)
					errors = EXT2_ERRORS_PANIC;
				else {
					bb_error_msg_and_die("bad error behavior - %s", optarg);
				}
				e_flag = 1;
				open_flag = EXT2_FLAG_RW;
				break;
			case 'f': /* Force */
				f_flag = 1;
				break;
			case 'g':
				resgid = bb_strtoul(optarg, NULL, 10);
				if (errno)
					resgid = xgroup2gid(optarg);
				g_flag = 1;
				open_flag = EXT2_FLAG_RW;
				break;
			case 'i':
				interval = strtoul(optarg, &tmp, 0);
				switch (*tmp) {
				case 's':
					tmp++;
					break;
				case '\0':
				case 'd':
				case 'D': /* days */
					interval *= 86400;
					if (*tmp != '\0')
						tmp++;
					break;
				case 'm':
				case 'M': /* months! */
					interval *= 86400 * 30;
					tmp++;
					break;
				case 'w':
				case 'W': /* weeks */
					interval *= 86400 * 7;
					tmp++;
					break;
				}
				if (*tmp || interval > (365 * 86400)) {
					bb_error_msg_and_die("bad interval - %s", optarg);
				}
				i_flag = 1;
				open_flag = EXT2_FLAG_RW;
				break;
			case 'j':
				if (!journal_size)
					journal_size = -1;
				open_flag = EXT2_FLAG_RW;
				break;
			case 'J':
				parse_journal_opts(&journal_device, &journal_flags, &journal_size, optarg);
				open_flag = EXT2_FLAG_RW;
				break;
			case 'l':
				l_flag = 1;
				break;
			case 'L':
				new_label = optarg;
				L_flag = 1;
				open_flag = EXT2_FLAG_RW |
					EXT2_FLAG_JOURNAL_DEV_OK;
				break;
			case 'm':
				reserved_ratio = xatou_range(optarg, 0, 50);
				m_flag = 1;
				open_flag = EXT2_FLAG_RW;
				break;
			case 'M':
				new_last_mounted = optarg;
				M_flag = 1;
				open_flag = EXT2_FLAG_RW;
				break;
			case 'o':
				if (mntopts_cmd) {
					bb_error_msg_and_die("-o may only be specified once");
				}
				mntopts_cmd = optarg;
				open_flag = EXT2_FLAG_RW;
				break;

			case 'O':
				if (features_cmd) {
					bb_error_msg_and_die("-O may only be specified once");
				}
				features_cmd = optarg;
				open_flag = EXT2_FLAG_RW;
				break;
			case 'r':
				reserved_blocks = xatoul(optarg);
				r_flag = 1;
				open_flag = EXT2_FLAG_RW;
				break;
			case 's':
				s_flag = atoi(optarg);
				open_flag = EXT2_FLAG_RW;
				break;
			case 'T':
				T_flag = 1;
				last_check_time = parse_time(optarg);
				open_flag = EXT2_FLAG_RW;
				break;
			case 'u':
				resuid = bb_strtoul(optarg, NULL, 10);
				if (errno)
					resuid = xuname2uid(optarg);
				u_flag = 1;
				open_flag = EXT2_FLAG_RW;
				break;
			case 'U':
				new_UUID = optarg;
				U_flag = 1;
				open_flag = EXT2_FLAG_RW |
					EXT2_FLAG_JOURNAL_DEV_OK;
				break;
			default:
				bb_show_usage();
		}
	if (optind < argc - 1 || optind == argc)
		bb_show_usage();
	if (!open_flag && !l_flag)
		bb_show_usage();
	io_options = strchr(argv[optind], '?');
	if (io_options)
		*io_options++ = 0;
	device_name = x_blkid_get_devname(argv[optind]);
}

#ifdef CONFIG_FINDFS
static ATTRIBUTE_NORETURN void do_findfs(int argc, char **argv)
{
	if ((argc != 2) ||
	    (strncmp(argv[1], "LABEL=", 6) && strncmp(argv[1], "UUID=", 5)))
		bb_show_usage();
	device_name = x_blkid_get_devname(argv[1]);
	puts(device_name);
	exit(0);
}
#else
#define do_findfs(x, y)
#endif

static void tune2fs_clean_up(void)
{
	if (ENABLE_FEATURE_CLEAN_UP && device_name) free(device_name);
	if (ENABLE_FEATURE_CLEAN_UP && journal_device) free(journal_device);
}

int tune2fs_main(int argc, char **argv);
int tune2fs_main(int argc, char **argv)
{
	errcode_t retval;
	ext2_filsys fs;
	struct ext2_super_block *sb;
	io_manager io_ptr;

	if (ENABLE_FEATURE_CLEAN_UP)
		atexit(tune2fs_clean_up);

	if (ENABLE_FINDFS && (applet_name[0] == 'f')) /* findfs */
		do_findfs(argc, argv);  /* no return */
	else if (ENABLE_E2LABEL && (applet_name[0] == 'e')) /* e2label */
		parse_e2label_options(argc, argv);
	else
		parse_tune2fs_options(argc, argv);  /* tune2fs */

	io_ptr = unix_io_manager;
	retval = ext2fs_open2(device_name, io_options, open_flag,
			      0, 0, io_ptr, &fs);
	if (retval)
		bb_error_msg_and_die("No valid superblock on %s", device_name);
	sb = fs->super;
	if (print_label) {
		/* For e2label emulation */
		printf("%.*s\n", (int) sizeof(sb->s_volume_name),
		       sb->s_volume_name);
		return 0;
	}
	retval = ext2fs_check_if_mounted(device_name, &mount_flags);
	if (retval)
		bb_error_msg_and_die("cannot determine if %s is mounted", device_name);
	/* Normally we only need to write out the superblock */
	fs->flags |= EXT2_FLAG_SUPER_ONLY;

	if (c_flag) {
		sb->s_max_mnt_count = max_mount_count;
		ext2fs_mark_super_dirty(fs);
		printf("Setting maximal mount count to %d\n", max_mount_count);
	}
	if (C_flag) {
		sb->s_mnt_count = mount_count;
		ext2fs_mark_super_dirty(fs);
		printf("Setting current mount count to %d\n", mount_count);
	}
	if (e_flag) {
		sb->s_errors = errors;
		ext2fs_mark_super_dirty(fs);
		printf("Setting error behavior to %d\n", errors);
	}
	if (g_flag) {
		sb->s_def_resgid = resgid;
		ext2fs_mark_super_dirty(fs);
		printf("Setting reserved blocks gid to %lu\n", resgid);
	}
	if (i_flag) {
		sb->s_checkinterval = interval;
		ext2fs_mark_super_dirty(fs);
		printf("Setting interval between check %lu seconds\n", interval);
	}
	if (m_flag) {
		sb->s_r_blocks_count = (sb->s_blocks_count / 100)
				* reserved_ratio;
		ext2fs_mark_super_dirty(fs);
		printf("Setting reserved blocks percentage to %u (%u blocks)\n",
			reserved_ratio, sb->s_r_blocks_count);
	}
	if (r_flag) {
		if (reserved_blocks >= sb->s_blocks_count/2)
			bb_error_msg_and_die("reserved blocks count is too big (%lu)", reserved_blocks);
		sb->s_r_blocks_count = reserved_blocks;
		ext2fs_mark_super_dirty(fs);
		printf("Setting reserved blocks count to %lu\n", reserved_blocks);
	}
	if (s_flag == 1) {
		if (sb->s_feature_ro_compat &
		    EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)
			bb_error_msg("\nThe filesystem already has sparse superblocks");
		else {
			sb->s_feature_ro_compat |=
				EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
			sb->s_state &= ~EXT2_VALID_FS;
			ext2fs_mark_super_dirty(fs);
			printf("\nSparse superblock flag set.  %s", please_fsck);
		}
	}
	if (s_flag == 0) {
		if (!(sb->s_feature_ro_compat &
		      EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER))
			bb_error_msg("\nThe filesystem already has sparse superblocks disabled");
		else {
			sb->s_feature_ro_compat &=
				~EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER;
			sb->s_state &= ~EXT2_VALID_FS;
			fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
			ext2fs_mark_super_dirty(fs);
			printf("\nSparse superblock flag cleared.  %s", please_fsck);
		}
	}
	if (T_flag) {
		sb->s_lastcheck = last_check_time;
		ext2fs_mark_super_dirty(fs);
		printf("Setting time filesystem last checked to %s\n",
		       ctime(&last_check_time));
	}
	if (u_flag) {
		sb->s_def_resuid = resuid;
		ext2fs_mark_super_dirty(fs);
		printf("Setting reserved blocks uid to %lu\n", resuid);
	}
	if (L_flag) {
		if (strlen(new_label) > sizeof(sb->s_volume_name))
			bb_error_msg("Warning: label too long, truncating");
		memset(sb->s_volume_name, 0, sizeof(sb->s_volume_name));
		safe_strncpy(sb->s_volume_name, new_label,
			sizeof(sb->s_volume_name));
		ext2fs_mark_super_dirty(fs);
	}
	if (M_flag) {
		memset(sb->s_last_mounted, 0, sizeof(sb->s_last_mounted));
		safe_strncpy(sb->s_last_mounted, new_last_mounted,
			sizeof(sb->s_last_mounted));
		ext2fs_mark_super_dirty(fs);
	}
	if (mntopts_cmd)
		update_mntopts(fs, mntopts_cmd);
	if (features_cmd)
		update_feature_set(fs, features_cmd);
	if (journal_size || journal_device)
		add_journal(fs);

	if (U_flag) {
		if ((strcasecmp(new_UUID, "null") == 0) ||
		    (strcasecmp(new_UUID, "clear") == 0)) {
			uuid_clear(sb->s_uuid);
		} else if (strcasecmp(new_UUID, "time") == 0) {
			uuid_generate_time(sb->s_uuid);
		} else if (strcasecmp(new_UUID, "random") == 0) {
			uuid_generate(sb->s_uuid);
		} else if (uuid_parse(new_UUID, sb->s_uuid)) {
			bb_error_msg_and_die("Invalid UUID format");
		}
		ext2fs_mark_super_dirty(fs);
	}

	if (l_flag)
		list_super (sb);
	return (ext2fs_close (fs) ? 1 : 0);
}