fsck.minix.c

Util-linux 软件包包含许多工具。其中比较重要的是加载、卸载、格式化、分区和管理硬盘驱动器

	if (!S_ISDIR (inode->i_mode) && !S_ISREG (inode->i_mode)
	    && !S_ISLNK (inode->i_mode))
		return;
	for (i = 0; i < 7; i++)
		add_zone2 (i + inode->i_zone, &changed);
	add_zone_ind2 (7 + inode->i_zone, &changed);
	add_zone_dind2 (8 + inode->i_zone, &changed);
	add_zone_tind2 (9 + inode->i_zone, &changed);
}

static void
check_file(struct minix_inode * dir, unsigned int offset) {
	static char blk[BLOCK_SIZE];
	struct minix_inode * inode;
	int ino;
	char * name;
	int block;

	block = map_block(dir,offset/BLOCK_SIZE);
	read_block(block, blk);
	name = blk + (offset % BLOCK_SIZE) + 2;
	ino = * (unsigned short *) (name-2);
	if (ino > INODES) {
		get_current_name();
		printf(_("The directory '%s' contains a bad inode number "
			 "for file '%.*s'."),
		       current_name, namelen, name);
		if (ask(_(" Remove"),1)) {
			*(unsigned short *)(name-2) = 0;
			write_block(block, blk);
		}
		ino = 0;
	}	
	if (name_depth < MAX_DEPTH)
		strncpy (name_list[name_depth], name, namelen);
	name_depth++;
	inode = get_inode(ino);
	name_depth--;
	if (!offset) {
		if (!inode || strcmp(".",name)) {
			get_current_name();
			printf(_("`%s': bad directory: '.' isn't first\n"),
			       current_name);
			errors_uncorrected = 1;
		} else return;
	}
	if (offset == dirsize) {
		if (!inode || strcmp("..",name)) {
			get_current_name();
			printf(_("`%s': bad directory: '..' isn't second\n"),
			       current_name);
			errors_uncorrected = 1;
		} else return;
	}
	if (!inode)
		return;
	if (name_depth < MAX_DEPTH)
		strncpy(name_list[name_depth], name, namelen);
	name_depth++;	
	if (list) {
		if (verbose)
			printf("%6d %07o %3d ", ino,
			       inode->i_mode, inode->i_nlinks);
		get_current_name();
		printf("%s", current_name);
		if (S_ISDIR(inode->i_mode))
			printf(":\n");
		else
			printf("\n");
	}
	check_zones(ino);
	if (inode && S_ISDIR(inode->i_mode))
		recursive_check(ino);
	name_depth--;
	return;
}

static void
check_file2 (struct minix2_inode *dir, unsigned int offset) {
	static char blk[BLOCK_SIZE];
	struct minix2_inode *inode;
	int ino;
	char *name;
	int block;

	block = map_block2 (dir, offset / BLOCK_SIZE);
	read_block (block, blk);
	name = blk + (offset % BLOCK_SIZE) + 2;
	ino = *(unsigned short *) (name - 2);
	if (ino > INODES) {
		get_current_name();
		printf(_("The directory '%s' contains a bad inode number "
			 "for file '%.*s'."),
			  current_name, namelen, name);
		if (ask (_(" Remove"), 1)) {
			*(unsigned short *) (name - 2) = 0;
			write_block (block, blk);
		}
		ino = 0;
	}
	if (name_depth < MAX_DEPTH)
		strncpy (name_list[name_depth], name, namelen);
	name_depth++;
	inode = get_inode2 (ino);
	name_depth--;
	if (!offset) {
		if (!inode || strcmp (".", name)) {
			get_current_name ();
			printf (_("%s: bad directory: '.' isn't first\n"),
				current_name);
			errors_uncorrected = 1;
		} else
			return;
	}
	if (offset == dirsize) {
		if (!inode || strcmp ("..", name)) {
			get_current_name ();
			printf (_("%s: bad directory: '..' isn't second\n"),
				current_name);
			errors_uncorrected = 1;
		} else
			return;
	}
	if (!inode)
		return;
	name_depth++;
	if (list) {
		if (verbose)
			printf ("%6d %07o %3d ", ino, inode->i_mode,
				inode->i_nlinks);
		get_current_name ();
		printf("%s", current_name);
		if (S_ISDIR (inode->i_mode))
			printf (":\n");
		else
			printf ("\n");
	}
	check_zones2 (ino);
	if (inode && S_ISDIR (inode->i_mode))
		recursive_check2 (ino);
	name_depth--;
	return;
}

static void
recursive_check(unsigned int ino) {
	struct minix_inode * dir;
	unsigned int offset;

	dir = Inode + ino;
	if (!S_ISDIR(dir->i_mode))
		die(_("internal error"));
	if (dir->i_size < 2 * dirsize) {
		get_current_name();
		printf(_("%s: bad directory: size < 32"),
		       current_name);
		errors_uncorrected = 1;
	}
	for (offset = 0 ; offset < dir->i_size ; offset += dirsize)
		check_file(dir,offset);
}

static void
recursive_check2 (unsigned int ino) {
	struct minix2_inode *dir;
	unsigned int offset;

	dir = Inode2 + ino;
	if (!S_ISDIR (dir->i_mode))
		die ("internal error");
	if (dir->i_size < 2 * dirsize) {
		get_current_name ();
		printf (_("%s: bad directory: size < 32"),
			current_name);
		errors_uncorrected = 1;
	}
	for (offset = 0; offset < dir->i_size; offset += dirsize)
		check_file2 (dir, offset);
}

static int
bad_zone(int i) {
	char buffer[1024];

	if (BLOCK_SIZE*i != lseek(IN, BLOCK_SIZE*i, SEEK_SET))
		die(_("seek failed in bad_zone"));
	return (BLOCK_SIZE != read(IN, buffer, BLOCK_SIZE));
}

static void
check_counts(void) {
	int i;

	for (i=1 ; i <= INODES ; i++) {
		if (!inode_in_use(i) && Inode[i].i_mode && warn_mode) {
			printf(_("Inode %d mode not cleared."),i);
			if (ask(_("Clear"),1)) {
				Inode[i].i_mode = 0;
				changed = 1;
			}
		}
		if (!inode_count[i]) {
			if (!inode_in_use(i))
				continue;
			printf(_("Inode %d not used, marked used in the bitmap."),i);
			if (ask(_("Clear"),1))
				unmark_inode(i);
			continue;
		}
		if (!inode_in_use(i)) {
			printf(_("Inode %d used, marked unused in the bitmap."),
				i);
			if (ask("Set",1))
				mark_inode(i);
		}
		if (Inode[i].i_nlinks != inode_count[i]) {
			printf(_("Inode %d (mode = %07o), i_nlinks=%d, counted=%d."),
				i,Inode[i].i_mode,Inode[i].i_nlinks,inode_count[i]);
			if (ask(_("Set i_nlinks to count"),1)) {
				Inode[i].i_nlinks=inode_count[i];
				changed=1;
			}
		}
	}
	for (i=FIRSTZONE ; i < ZONES ; i++) {
		if (zone_in_use(i) == zone_count[i])
			continue;
		if (!zone_count[i]) {
			if (bad_zone(i))
				continue;
			printf(_("Zone %d: marked in use, no file uses it."),i);
			if (ask(_("Unmark"),1))
				unmark_zone(i);
			continue;
		}
		if (zone_in_use(i))
			printf(_("Zone %d: in use, counted=%d\n"),
			       i, zone_count[i]);
		else
			printf(_("Zone %d: not in use, counted=%d\n"),
			       i, zone_count[i]);
	}
}

static void
check_counts2 (void) {
	int i;

	for (i = 1; i <= INODES; i++) {
		if (!inode_in_use (i) && Inode2[i].i_mode && warn_mode) {
			printf (_("Inode %d mode not cleared."), i);
			if (ask (_("Clear"), 1)) {
				Inode2[i].i_mode = 0;
				changed = 1;
			}
		}
		if (!inode_count[i]) {
			if (!inode_in_use (i))
				continue;
			printf (_("Inode %d not used, marked used in the bitmap."), i);
			if (ask (_("Clear"), 1))
				unmark_inode (i);
			continue;
		}
		if (!inode_in_use (i)) {
			printf (_("Inode %d used, marked unused in the bitmap."), i);
			if (ask (_("Set"), 1))
				mark_inode (i);
		}
		if (Inode2[i].i_nlinks != inode_count[i]) {
			printf (_("Inode %d (mode = %07o), i_nlinks=%d, counted=%d."),
				i, Inode2[i].i_mode, Inode2[i].i_nlinks, inode_count[i]);
			if (ask (_("Set i_nlinks to count"), 1)) {
				Inode2[i].i_nlinks = inode_count[i];
				changed = 1;
			}
		}
	}
	for (i = FIRSTZONE; i < ZONES; i++) {
		if (zone_in_use (i) == zone_count[i])
			continue;
		if (!zone_count[i]) {
			if (bad_zone (i))
				continue;
			printf (_("Zone %d: marked in use, no file uses it."),
				i);
			if (ask (_("Unmark"), 1))
				unmark_zone (i);
			continue;
		}
		if (zone_in_use (i))
			printf (_("Zone %d: in use, counted=%d\n"),
				i, zone_count[i]);
		else
			printf (_("Zone %d: not in use, counted=%d\n"),
				i, zone_count[i]);
	}
}

static void
check(void) {
	memset(inode_count,0,(INODES + 1) * sizeof(*inode_count));
	memset(zone_count,0,ZONES*sizeof(*zone_count));
	check_zones(ROOT_INO);
	recursive_check(ROOT_INO);
	check_counts();
}

static void
check2 (void) {
	memset (inode_count, 0, (INODES + 1) * sizeof (*inode_count));
	memset (zone_count, 0, ZONES * sizeof (*zone_count));
	check_zones2 (ROOT_INO);
	recursive_check2 (ROOT_INO);
	check_counts2 ();
}

int
main(int argc, char ** argv) {
	struct termios tmp;
	int count;
	int retcode = 0;
	char *p;

	program_name = (argc && *argv) ? argv[0] : "fsck.minix";
	if ((p = strrchr(program_name, '/')) != NULL)
		program_name = p+1;

	setlocale(LC_ALL, "");
	bindtextdomain(PACKAGE, LOCALEDIR);
	textdomain(PACKAGE);

	if (argc == 2 &&
	    (!strcmp(argv[1], "-V") || !strcmp(argv[1], "--version"))) {
		printf(_("%s from %s\n"), program_name, util_linux_version);
		exit(0);
	}

	if (INODE_SIZE * MINIX_INODES_PER_BLOCK != BLOCK_SIZE)
		die(_("bad inode size"));
	if (INODE_SIZE2 * MINIX2_INODES_PER_BLOCK != BLOCK_SIZE)
		die(_("bad v2 inode size"));

	while (argc-- > 1) {
		argv++;
		if (argv[0][0] != '-') {
			if (device_name)
				usage();
			else
				device_name = argv[0];
		} else while (*++argv[0])
			switch (argv[0][0]) {
				case 'l': list=1; break;
				case 'a': automatic=1; repair=1; break;
				case 'r': automatic=0; repair=1; break;
				case 'v': verbose=1; break;
				case 's': show=1; break;
				case 'm': warn_mode=1; break;
				case 'f': force=1; break;
				default: usage();
			}
	}
	if (!device_name)
		usage();
	check_mount();		/* trying to check a mounted filesystem? */
	if (repair && !automatic) {
		if (!isatty(0) || !isatty(1))
			die(_("need terminal for interactive repairs"));
	}
	IN = open(device_name,repair?O_RDWR:O_RDONLY);
	if (IN < 0)
		die(_("unable to open '%s'"));
	for (count=0 ; count<3 ; count++)
		sync();
	read_superblock();

	/*
	 * Determine whether or not we should continue with the checking.
	 * This is based on the status of the filesystem valid and error
	 * flags and whether or not the -f switch was specified on the 
	 * command line.
	 */
	if ( !(Super.s_state & MINIX_ERROR_FS) && 
	      (Super.s_state & MINIX_VALID_FS) && 
	      !force ) {
		if (repair)
			printf(_("%s is clean, no check.\n"), device_name);
		return retcode;
	}
	else if (force)
		printf(_("Forcing filesystem check on %s.\n"), device_name);
	else if (repair)
		printf(_("Filesystem on %s is dirty, needs checking.\n"),\
			device_name);

	read_tables();

	if (repair && !automatic) {
		tcgetattr(0,&termios);
		tmp = termios;
		tmp.c_lflag &= ~(ICANON|ECHO);
		tcsetattr(0,TCSANOW,&tmp);
		termios_set = 1;
	}

	if (version2) {
		check_root2 ();
		check2 ();
	} else {
		check_root();
		check();
	}
	if (verbose) {
		int i, free;

		for (i=1,free=0 ; i <= INODES ; i++)
			if (!inode_in_use(i))
				free++;
		printf(_("\n%6ld inodes used (%ld%%)\n"),(INODES-free),
			100*(INODES-free)/INODES);
		for (i=FIRSTZONE,free=0 ; i < ZONES ; i++)
			if (!zone_in_use(i))
				free++;
		printf(_("%6ld zones used (%ld%%)\n"),(ZONES-free),
			100*(ZONES-free)/ZONES);
		printf(_("\n%6d regular files\n"
		"%6d directories\n"
		"%6d character device files\n"
		"%6d block device files\n"
		"%6d links\n"
		"%6d symbolic links\n"
		"------\n"
		"%6d files\n"),
		regular,directory,chardev,blockdev,
		links-2*directory+1,symlinks,total-2*directory+1);
	}
	if (changed) {
		write_tables();
		printf(_(	"----------------------------\n"
			"FILE SYSTEM HAS BEEN CHANGED\n"
			"----------------------------\n"));
		for (count=0 ; count<3 ; count++)
			sync();
	}
	else if ( repair )
		write_super_block();
	
	if (repair && !automatic)
		tcsetattr(0,TCSANOW,&termios);

	if (changed)
	      retcode += 3;
	if (errors_uncorrected)
	      retcode += 4;
	return retcode;
}