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 (blk_chg)
			write_block (block, (char *) ind);
		return result;
	}
	blknr -= 256;
	if (blknr >= 256 * 256) {
		block = check_zone_nr2 (inode->i_zone + 8, &changed);
		read_block (block, (char *) dind);
		blk_chg = 0;
		result = check_zone_nr2 (dind + blknr / 256, &blk_chg);
		if (blk_chg)
			write_block (block, (char *) dind);
		block = result;
		read_block (block, (char *) ind);
		blk_chg = 0;
		result = check_zone_nr2 (ind + blknr % 256, &blk_chg);
		if (blk_chg)
			write_block (block, (char *) ind);
		return result;
	}
	blknr -= 256 * 256;
	block = check_zone_nr2 (inode->i_zone + 9, &changed);
	read_block (block, (char *) tind);
	blk_chg = 0;
	result = check_zone_nr2 (tind + blknr / (256 * 256), &blk_chg);
	if (blk_chg)
		write_block (block, (char *) tind);
	block = result;
	read_block (block, (char *) dind);
	blk_chg = 0;
	result = check_zone_nr2 (dind + (blknr / 256) % 256, &blk_chg);
	if (blk_chg)
		write_block (block, (char *) dind);
	block = result;
	read_block (block, (char *) ind);
	blk_chg = 0;
	result = check_zone_nr2 (ind + blknr % 256, &blk_chg);
	if (blk_chg)
		write_block (block, (char *) ind);
	return result;
}

static void
write_super_block(void) {
	/*
	 * Set the state of the filesystem based on whether or not there
	 * are uncorrected errors.  The filesystem valid flag is
	 * unconditionally set if we get this far.
	 */
	Super.s_state |= MINIX_VALID_FS;
	if ( errors_uncorrected )
		Super.s_state |= MINIX_ERROR_FS;
	else
		Super.s_state &= ~MINIX_ERROR_FS;
	
	if (BLOCK_SIZE != lseek(IN, BLOCK_SIZE, SEEK_SET))
		die(_("seek failed in write_super_block"));
	if (BLOCK_SIZE != write(IN, super_block_buffer, BLOCK_SIZE))
		die(_("unable to write super-block"));

	return;
}

static void
write_tables(void) {
	write_super_block();

	if (IMAPS*BLOCK_SIZE != write(IN,inode_map,IMAPS*BLOCK_SIZE))
		die(_("Unable to write inode map"));
	if (ZMAPS*BLOCK_SIZE != write(IN,zone_map,ZMAPS*BLOCK_SIZE))
		die(_("Unable to write zone map"));
	if (INODE_BUFFER_SIZE != write(IN,inode_buffer,INODE_BUFFER_SIZE))
		die(_("Unable to write inodes"));
}

static void
get_dirsize (void) {
	int block;
	char blk[BLOCK_SIZE];
	int size;

	if (version2)
		block = Inode2[ROOT_INO].i_zone[0];
	else
		block = Inode[ROOT_INO].i_zone[0];
	read_block (block, blk);
	for (size = 16; size < BLOCK_SIZE; size <<= 1) {
		if (strcmp (blk + size + 2, "..") == 0) {
			dirsize = size;
			namelen = size - 2;
			return;
		}
	}
	/* use defaults */
}

static void
read_superblock(void) {
	if (BLOCK_SIZE != lseek(IN, BLOCK_SIZE, SEEK_SET))
		die(_("seek failed"));
	if (BLOCK_SIZE != read(IN, super_block_buffer, BLOCK_SIZE))
		die(_("unable to read super block"));
	if (MAGIC == MINIX_SUPER_MAGIC) {
		namelen = 14;
		dirsize = 16;
		version2 = 0;
	} else if (MAGIC == MINIX_SUPER_MAGIC2) {
		namelen = 30;
		dirsize = 32;
		version2 = 0;
	} else if (MAGIC == MINIX2_SUPER_MAGIC) {
		namelen = 14;
		dirsize = 16;
		version2 = 1;
	} else if (MAGIC == MINIX2_SUPER_MAGIC2) {
		namelen = 30;
		dirsize = 32;
		version2 = 1;
	} else
		die(_("bad magic number in super-block"));
	if (ZONESIZE != 0 || BLOCK_SIZE != 1024)
		die(_("Only 1k blocks/zones supported"));
	if (IMAPS * BLOCK_SIZE * 8 < INODES + 1)
		die(_("bad s_imap_blocks field in super-block"));
	if (ZMAPS * BLOCK_SIZE * 8 < ZONES - FIRSTZONE + 1)
		die(_("bad s_zmap_blocks field in super-block"));
}

static void
read_tables(void) {
	inode_map = malloc(IMAPS * BLOCK_SIZE);
	if (!inode_map)
		die(_("Unable to allocate buffer for inode map"));
	zone_map = malloc(ZMAPS * BLOCK_SIZE);
	if (!inode_map)
		die("Unable to allocate buffer for zone map");
	memset(inode_map,0,sizeof(inode_map));
	memset(zone_map,0,sizeof(zone_map));
	inode_buffer = malloc(INODE_BUFFER_SIZE);
	if (!inode_buffer)
		die(_("Unable to allocate buffer for inodes"));
	inode_count = malloc(INODES + 1);
	if (!inode_count)
		die(_("Unable to allocate buffer for inode count"));
	zone_count = malloc(ZONES);
	if (!zone_count)
		die(_("Unable to allocate buffer for zone count"));
	if (IMAPS*BLOCK_SIZE != read(IN,inode_map,IMAPS*BLOCK_SIZE))
		die(_("Unable to read inode map"));
	if (ZMAPS*BLOCK_SIZE != read(IN,zone_map,ZMAPS*BLOCK_SIZE))
		die(_("Unable to read zone map"));
	if (INODE_BUFFER_SIZE != read(IN,inode_buffer,INODE_BUFFER_SIZE))
		die(_("Unable to read inodes"));
	if (NORM_FIRSTZONE != FIRSTZONE) {
		printf(_("Warning: Firstzone != Norm_firstzone\n"));
		errors_uncorrected = 1;
	}
	get_dirsize ();
	if (show) {
		printf(_("%ld inodes\n"),INODES);
		printf(_("%ld blocks\n"),ZONES);
		printf(_("Firstdatazone=%ld (%ld)\n"),FIRSTZONE,NORM_FIRSTZONE);
		printf(_("Zonesize=%d\n"),BLOCK_SIZE<<ZONESIZE);
		printf(_("Maxsize=%ld\n"),MAXSIZE);
		printf(_("Filesystem state=%d\n"), Super.s_state);
		printf(_("namelen=%d\n\n"),namelen);
	}
}

static struct minix_inode *
get_inode(unsigned int nr) {
	struct minix_inode * inode;

	if (!nr || nr > INODES)
		return NULL;
	total++;
	inode = Inode + nr;
	if (!inode_count[nr]) {
		if (!inode_in_use(nr)) {
			get_current_name();
			printf(_("Inode %d marked unused, "
				 "but used for file '%s'\n"),
			       nr, current_name);
			if (repair) {
				if (ask(_("Mark in use"),1))
					mark_inode(nr);
			} else {
			        errors_uncorrected = 1;
			}
		}
		if (S_ISDIR(inode->i_mode))
			directory++;
		else if (S_ISREG(inode->i_mode))
			regular++;
		else if (S_ISCHR(inode->i_mode))
			chardev++;
		else if (S_ISBLK(inode->i_mode))
			blockdev++;
		else if (S_ISLNK(inode->i_mode))
			symlinks++;
		else if (S_ISSOCK(inode->i_mode))
			;
		else if (S_ISFIFO(inode->i_mode))
			;
		else {
                        get_current_name();
                        printf(_("The file `%s' has mode %05o\n"),
			       current_name, inode->i_mode);
                }

	} else
		links++;
	if (!++inode_count[nr]) {
		printf(_("Warning: inode count too big.\n"));
		inode_count[nr]--;
		errors_uncorrected = 1;
	}
	return inode;
}

static struct minix2_inode *
get_inode2 (unsigned int nr) {
	struct minix2_inode *inode;

	if (!nr || nr > INODES)
		return NULL;
	total++;
	inode = Inode2 + nr;
	if (!inode_count[nr]) {
		if (!inode_in_use (nr)) {
			get_current_name();
			printf (_("Inode %d marked unused, "
				  "but used for file '%s'\n"),
				nr, current_name);
			if (repair) {
				if (ask (_("Mark in use"), 1))
					mark_inode (nr);
				else
					errors_uncorrected = 1;
			}
		}
		if (S_ISDIR (inode->i_mode))
			directory++;
		else if (S_ISREG (inode->i_mode))
			regular++;
		else if (S_ISCHR (inode->i_mode))
			chardev++;
		else if (S_ISBLK (inode->i_mode))
			blockdev++;
		else if (S_ISLNK (inode->i_mode))
			symlinks++;
		else if (S_ISSOCK (inode->i_mode));
		else if (S_ISFIFO (inode->i_mode));
		else {
			get_current_name ();
			printf (_("The file `%s' has mode %05o\n"),
				current_name, inode->i_mode);
		}
	} else
		links++;
	if (!++inode_count[nr]) {
		printf (_("Warning: inode count too big.\n"));
		inode_count[nr]--;
		errors_uncorrected = 1;
	}
	return inode;
}

static void
check_root(void) {
	struct minix_inode * inode = Inode + ROOT_INO;

	if (!inode || !S_ISDIR(inode->i_mode))
		die(_("root inode isn't a directory"));
}

static void
check_root2 (void) {
	struct minix2_inode *inode = Inode2 + ROOT_INO;

	if (!inode || !S_ISDIR (inode->i_mode))
		die ("root inode isn't a directory");
}

static int
add_zone(unsigned short * znr, int * corrected) {
	int result;
	int block;

	result = 0;
	block = check_zone_nr(znr, corrected);
	if (!block)
		return 0;
	if (zone_count[block]) {
		get_current_name();
		printf(_("Block has been used before. Now in file `%s'."),
		       current_name);
		if (ask(_("Clear"),1)) {
			*znr = 0;
			block = 0;
			*corrected = 1;
		}
	}
	if (!block)
		return 0;
	if (!zone_in_use(block)) {
		get_current_name();
		printf(_("Block %d in file `%s' is marked not in use."),
		       block, current_name);
		if (ask(_("Correct"),1))
			mark_zone(block);
	}
	if (!++zone_count[block])
		zone_count[block]--;
	return block;
}

static int
add_zone2 (unsigned int *znr, int *corrected) {
	int result;
	int block;

	result = 0;
	block = check_zone_nr2 (znr, corrected);
	if (!block)
		return 0;
	if (zone_count[block]) {
		get_current_name();
		printf (_("Block has been used before. Now in file `%s'."),
			current_name);
		if (ask (_("Clear"), 1)) {
			*znr = 0;
			block = 0;
			*corrected = 1;
		}
	}
	if (!block)
		return 0;
	if (!zone_in_use (block)) {
		get_current_name();
		printf (_("Block %d in file `%s' is marked not in use."),
			block, current_name);
		if (ask (_("Correct"), 1))
			mark_zone (block);
	}
	if (!++zone_count[block])
		zone_count[block]--;
	return block;
}

static void
add_zone_ind(unsigned short * znr, int * corrected) {
	static char blk[BLOCK_SIZE];
	int i, chg_blk=0;
	int block;

	block = add_zone(znr, corrected);
	if (!block)
		return;
	read_block(block, blk);
	for (i=0 ; i < (BLOCK_SIZE>>1) ; i++)
		add_zone(i + (unsigned short *) blk, &chg_blk);
	if (chg_blk)
		write_block(block, blk);
}

static void
add_zone_ind2 (unsigned int *znr, int *corrected) {
	static char blk[BLOCK_SIZE];
	int i, chg_blk = 0;
	int block;

	block = add_zone2 (znr, corrected);
	if (!block)
		return;
	read_block (block, blk);
	for (i = 0; i < BLOCK_SIZE >> 2; i++)
		add_zone2 (i + (unsigned int *) blk, &chg_blk);
	if (chg_blk)
		write_block (block, blk);
}

static void
add_zone_dind(unsigned short * znr, int * corrected) {
	static char blk[BLOCK_SIZE];
	int i, blk_chg=0;
	int block;

	block = add_zone(znr, corrected);
	if (!block)
		return;
	read_block(block, blk);
	for (i=0 ; i < (BLOCK_SIZE>>1) ; i++)
		add_zone_ind(i + (unsigned short *) blk, &blk_chg);
	if (blk_chg)
		write_block(block, blk);
}

static void
add_zone_dind2 (unsigned int *znr, int *corrected) {
	static char blk[BLOCK_SIZE];
	int i, blk_chg = 0;
	int block;

	block = add_zone2 (znr, corrected);
	if (!block)
		return;
	read_block (block, blk);
	for (i = 0; i < BLOCK_SIZE >> 2; i++)
		add_zone_ind2 (i + (unsigned int *) blk, &blk_chg);
	if (blk_chg)
		write_block (block, blk);
}

static void
add_zone_tind2 (unsigned int *znr, int *corrected) {
	static char blk[BLOCK_SIZE];
	int i, blk_chg = 0;
	int block;

	block = add_zone2 (znr, corrected);
	if (!block)
		return;
	read_block (block, blk);
	for (i = 0; i < BLOCK_SIZE >> 2; i++)
		add_zone_dind2 (i + (unsigned int *) blk, &blk_chg);
	if (blk_chg)
		write_block (block, blk);
}

static void
check_zones(unsigned int i) {
	struct minix_inode * inode;

	if (!i || i > INODES)
		return;
	if (inode_count[i] > 1)	/* have we counted this file already? */
		return;
	inode = Inode + i;
	if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
	    !S_ISLNK(inode->i_mode))
		return;
	for (i=0 ; i<7 ; i++)
		add_zone(i + inode->i_zone, &changed);
	add_zone_ind(7 + inode->i_zone, &changed);
	add_zone_dind(8 + inode->i_zone, &changed);
}

static void
check_zones2 (unsigned int i) {
	struct minix2_inode *inode;

	if (!i || i > INODES)
		return;
	if (inode_count[i] > 1)	/* have we counted this file already? */
		return;
	inode = Inode2 + i;