Diff of /busyelks/alt/fsck.c [000000] .. [d03537] Maximize Restore

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+/*
+ * fsck.c - a file system consistency checker for Linux.
+ *
+ * (C) 1991, 1992 Linus Torvalds. This file may be redistributed
+ * as per the GNU copyleft.
+ */
+
+/*
+ * 09.11.91  -  made the first rudimetary functions
+ *
+ * 10.11.91  -  updated, does checking, no repairs yet.
+ *		Sent out to the mailing-list for testing.
+ *
+ * 14.11.91  -	Testing seems to have gone well. Added some
+ *		correction-code, and changed some functions.
+ *
+ * 15.11.91  -  More correction code. Hopefully it notices most
+ *		cases now, and tries to do something about them.
+ *
+ * 16.11.91  -  More corrections (thanks to Mika Jalava). Most
+ *		things seem to work now. Yeah, sure.
+ *
+ *
+ * 19.04.92  -	Had to start over again from this old version, as a
+ *		kernel bug ate my enhanced fsck in february.
+ *
+ * 28.02.93  -	added support for different directory entry sizes..
+ *
+ * Sat Mar  6 18:59:42 1993, faith@cs.unc.edu: Output namelen with
+ *                           super-block information
+ *
+ * Sat Oct  9 11:17:11 1993, faith@cs.unc.edu: make exit status conform
+ *                           to that required by fsutil
+ *
+ * Mon Jan  3 11:06:52 1994 - Dr. Wettstein (greg%wind.uucp@plains.nodak.edu)
+ *			      Added support for file system valid flag.  Also
+ *			      added program_version variable and output of
+ *			      program name and version number when program
+ *			      is executed.
+ *
+ * I've had no time to add comments - hopefully the function names
+ * are comments enough. As with all file system checkers, this assumes
+ * the file system is quiescent - don't use it on a mounted device
+ * unless you can be sure nobody is writing to it (and remember that the
+ * kernel can write to it when it searches for files).
+ *
+ * Usuage: fsck [-larvsm] device
+ *	-l for a listing of all the filenames
+ *	-a for automatic repairs (not implemented)
+ *	-r for repairs (interactive) (not implemented)
+ *	-v for verbose (tells how many files)
+ *	-s for super-block info
+ *	-m for minix-like "mode not cleared" warnings
+ *	-f force filesystem check even if filesystem marked as valid
+ *
+ * The device may be a block device or a image of one, but this isn't
+ * enforced (but it's not much fun on a character device :-). 
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <termios.h>
+#include <sys/stat.h>
+
+#include <linuxmt/fs.h>
+#include <linuxmt/minix_fs.h>
+
+#ifndef __linux__
+#define volatile
+#endif
+
+#define printd /*printf*/
+/* FIXME remove all commented out code with RUBOUT in it */
+
+
+#define ROOT_INO 1
+
+#define UPPER(size,n) ((size+((n)-1))/(n))
+
+#define BITS_PER_BLOCK (BLOCK_SIZE<<3)
+
+static char * program_name = "fsck.minix";
+static char * program_version = "1.0 - 12/30/93";
+static char * device_name = NULL;
+static int IN;
+static int repair=0, automatic=0, verbose=0, list=0, show=0, warn_mode=0, 
+	force=0;
+static int directory=0, regular=0, blockdev=0, chardev=0, links=0,
+		symlinks=0, total=0;
+
+static int changed = 0; /* flags if the filesystem has been changed */
+static int errors_uncorrected = 0; /* flag if some error was not corrected */
+/* static int dirsize = 16; RUBOUT */
+/* static int namelen = 14; RUBOUT */ 
+
+#define DIRSIZE 16
+#define NAMELEN 14
+
+/* File-name data */
+#define MAX_DEPTH 50
+static int name_depth = 0;
+static char name_list[MAX_DEPTH][NAMELEN+1];
+
+
+/*static char * inode_buffer = NULL; */
+static char inode_buffer[BLOCK_SIZE];
+#define Inode (((struct minix_inode *) inode_buffer)-1)
+static char super_block_buffer[BLOCK_SIZE];
+struct minix_super_block * SupeP = (struct minix_super_block *)super_block_buffer;
+#define Super (*(struct minix_super_block *)super_block_buffer)
+/* #define SupeP ((struct minix_super_block *)super_block_buffer) */
+#define INODES (SupeP->s_ninodes)
+#define ZONES (SupeP->s_nzones)
+#define IMAPS (SupeP->s_imap_blocks)
+#define ZMAPS (SupeP->s_zmap_blocks)
+#define FIRSTZONE (SupeP->s_firstdatazone)
+#define ZONESIZE (SupeP->s_log_zone_size)
+#define MAXSIZE (SupeP->s_max_size)
+#define MAGIC (SupeP->s_magic)
+#define INODE_SIZE (sizeof(struct minix_inode))
+#define INODE_BLOCKS UPPER(INODES,MINIX_INODES_PER_BLOCK)
+#define INODE_BUFFER_SIZE (INODE_BLOCKS * BLOCK_SIZE)
+#define NORM_FIRSTZONE (2+IMAPS+ZMAPS+INODE_BLOCKS)
+
+static char inode_map[BLOCK_SIZE * MINIX_I_MAP_SLOTS];
+static char zone_map[BLOCK_SIZE * 2];
+
+static unsigned char * inode_count = NULL;
+static unsigned char * zone_count = NULL;
+
+void recursive_check(unsigned int ino);
+
+#define bit(addr,bit) (test_bit((bit),(addr)) != 0)
+#define setbit(addr,bit) (set_bit((bit),(addr)) != 0)
+#define clrbit(addr,bit) (clear_bit((bit),(addr)) != 0)
+
+#define inode_in_use(x) (bit(inode_map,(x)))
+#define zone_in_use(x) (bit(zone_map,(x)-FIRSTZONE+1))
+
+#define mark_inode(x) (setbit(inode_map,(x)),changed=1)
+#define unmark_inode(x) (clrbit(inode_map,(x)),changed=1)
+
+#define mark_zone(x) (setbit(zone_map,(x)-FIRSTZONE+1),changed=1)
+#define unmark_zone(x) (clrbit(zone_map,(x)-FIRSTZONE+1),changed=1)
+
+/*
+ * Volatile to let gcc know that this doesn't return. When trying
+ * to compile this under minix, volatile gives a warning, as
+ * exit() isn't defined as volatile under minix.
+ */
+volatile void fsck_fatal_error(const char * fmt_string, int status)
+{
+	fprintf(stderr,fmt_string,program_name,device_name);
+	exit(status);
+}
+
+#define usage() fsck_fatal_error("Usage: %s [-larvsmf] /dev/name\n",16)
+#define die(str) fsck_fatal_error("%s: " str "\n",8)
+
+int mapped_block = -1; /* Block in the inode area that is mapped */
+int mapped_dirty = 0;  /* non-zero indicates inode block has been altered */
+
+void unmap_inode_buffer()
+/* Write the inode block in inode_buffer back to disk if it is dirty.
+ */
+{
+	printd("Unmap requested: ");
+	if (mapped_dirty == 0) {	/* Nothing to do. */
+		printd("not dirty\n");
+		return;
+	}
+	if (mapped_block < 0) {	/* Nothing to do. */
+		printd("none mapped\n");
+		return;
+	}
+	/* Seek to after the Superblock, inode maps and zone maps */
+	lseek(IN, (off_t)((2 + IMAPS + ZMAPS) * BLOCK_SIZE), SEEK_SET);
+	/* Seek to the block we have to write */
+	if (mapped_block > 1) {
+		lseek(IN, (off_t)((mapped_block) * BLOCK_SIZE), SEEK_CUR);
+	}
+	if (BLOCK_SIZE != write(IN, inode_buffer, BLOCK_SIZE)) {
+		die("Unable to write inodes");
+	}
+	mapped_dirty = 0;
+	printd("Block %d unmapped.", mapped_block);
+}
+
+void inode_dump(struct minix_inode * ptr)
+{
+	int mode = ptr->i_mode;
+	int i;
+
+	printf("Mode %d %d %d %d\n", mode & 7, (mode>>4) & 7, (mode>>4) & 7, (mode>>12) & 7);
+	printf("uid %d size %ld gid %d links %d\n", ptr->i_uid, ptr->i_size, ptr->i_gid, ptr->i_nlinks);
+	for(i=0;i<9;i++){
+		printf("Z%d ", ptr->i_zone[i]);
+	}
+	printf("\n");
+}
+	
+
+struct minix_inode * map_inode(unsigned int nr)
+/* Take an inode number and map the 1024 byte block on disk containing this
+ * inode into the inode memory area inode_buffer, returning a pointer to
+ * the inode.
+ */
+{
+	int inode_block; 	/* Block in the inode area we have to map */
+	int inode_offset;	/* Inode offset in current block */
+	struct minix_inode * inode_ptr;
+
+	if (!nr || nr >= INODES)
+		return NULL;
+	inode_block = nr >> 5;
+	inode_offset = (nr & 31) - 1;
+	printd("Map of inode %d requested which is no %d in block %d\n",
+		nr, inode_offset, inode_block);
+	inode_ptr = ((struct minix_inode *)inode_buffer) + inode_offset;
+	if (mapped_block != -1) {
+		/* CHECK IF IT IS THE BLOCK WE WANT */
+		if (inode_block == mapped_block) {
+			/* If so return pointer */
+			printd("Block was already mapped.\n");
+			return inode_ptr;
+		}
+		/* WRITE OLD INODE BLOCK BACK TO DISK */
+		unmap_inode_buffer();		
+	}
+	/* Seek to after the Superblock, inode maps and zone maps */
+	lseek(IN, (off_t)((2 + IMAPS + ZMAPS) * BLOCK_SIZE), SEEK_SET);
+	/* Seek to the block we have to write */
+	if (inode_block > 0) {
+		lseek(IN, (off_t)((inode_block) * BLOCK_SIZE), SEEK_CUR);
+	}
+	/* READ In NEW BLOCK FROM DISK */
+	if (BLOCK_SIZE != read(IN, inode_buffer, BLOCK_SIZE)) {
+		die("Unable to read inodes");
+	}
+	/* SET mapped */
+	mapped_block = inode_block;
+	/* RETURN POINTER */
+	inode_dump(inode_ptr);
+	return inode_ptr;
+}
+
+/*
+ * This simply goes through the file-name data and prints out the
+ * current file.
+ */
+
+void print_current_name(void)
+{
+	int i=0;
+
+	while (i<name_depth)
+		printf("/%.*s",14,name_list[i++]);
+		/* FIXME 14 can be integrated */
+}
+
+int ask(const char * string,int def)
+{
+	int c;
+
+	if (!repair) {
+		printf("\n");
+		errors_uncorrected = 1;
+		return 0;
+	}
+	if (automatic) {
+		printf("\n");
+		if (!def)
+		      errors_uncorrected = 1;
+		return def;
+	}
+	printf(def?"%s (y/n)? ":"%s (n/y)? ",string);
+	for (;;) {
+		fflush(stdout);
+		if ((c=getchar())==EOF) {
+		        if (!def)
+			      errors_uncorrected = 1;
+			return def;
+		}
+		c=toupper(c);
+		if (c == 'Y') {
+			def = 1;
+			break;
+		} else if (c == 'N') {
+			def = 0;
+			break;
+		} else if (c == ' ' || c == '\n')
+			break;
+	}
+	if (def)
+		printf("y\n");
+	else {
+		printf("n\n");
+		errors_uncorrected = 1;
+	     }
+	return def;
+}
+
+/*
+ * check_zone_nr checks to see that *nr is a valid zone nr. If it
+ * isn't, it will possibly be repaired. Check_zone_nr sets *corrected
+ * if an error was corrected, and returns the zone (0 for no zone
+ * or a bad zone-number).
+ */
+int check_zone_nr(unsigned short * nr, int * corrected)
+{
+	if (!*nr)
+		return 0;
+	if (*nr < FIRSTZONE)
+		printf("Zone nr < FIRSTZONE in file `");
+	else if (*nr >= ZONES)
+		printf("Zone nr >= ZONES in file `");
+	else
+		return *nr;
+	print_current_name();
+	printf("'.");
+	if (ask("Remove block",1)) {
+		*nr = 0;
+		*corrected = 1;
+	}
+	return 0;
+}
+
+/*
+ * read-block reads block nr into the buffer at addr.
+ */
+void read_block(unsigned int nr, char * addr)
+{
+	int i;
+	off_t dest = (off_t)BLOCK_SIZE * nr;
+
+	printd("read_block %x %lx ", nr, dest);
+	if (!nr) {
+		memset(addr,0,BLOCK_SIZE);
+		return;
+	}
+	if (dest != lseek(IN, dest, SEEK_SET)) {
+		printf("Read error: unable to seek to block in file '");
+		print_current_name();
+		printf("'\n");
+		memset(addr,0,BLOCK_SIZE);
+		errors_uncorrected = 1;
+	} else if (BLOCK_SIZE != read(IN, addr, BLOCK_SIZE)) {
+		printf("Read error: bad block in file '");
+		print_current_name();
+		printf("'\n");
+		memset(addr,0,BLOCK_SIZE);
+		errors_uncorrected = 1;
+	}
+	for(i = 0; i < 16; i++) {
+		printd("%x ", addr[i]);
+	}
+	printd("\n");
+}
+
+/*
+ * write_block writes block nr to disk.
+ */
+void fsck_write_block(unsigned int nr, char * addr)
+{
+	off_t dest = (off_t)BLOCK_SIZE * nr;
+	if (!nr)
+		return;
+	if (nr < FIRSTZONE || nr >= ZONES) {
+		printf("Internal error: trying to write bad block\n"
+		"Write request ignored\n");
+		errors_uncorrected = 1;
+		return;
+	}
+	if (dest != lseek(IN, dest, SEEK_SET))
+		die("seek failed in write_block");
+	if (BLOCK_SIZE != write(IN, addr, BLOCK_SIZE)) {
+		printf("Write error: bad block in file '");
+		print_current_name();
+		printf("'\n");
+		errors_uncorrected = 1;
+	}
+}
+
+/*
+ * map-block calculates the absolute block nr of a block in a file.
+ * It sets 'changed' if the inode has needed changing, and re-writes
+ * any indirect blocks with errors.
+ */
+unsigned int map_block(struct minix_inode * inode, unsigned int blknr)
+{
+	unsigned short ind[BLOCK_SIZE>>1];
+	unsigned short dind[BLOCK_SIZE>>1];
+	int blk_chg, block, result;
+	int i;
+
+	printd("map_block %x %d (", inode, blknr);
+	for(i = 0; i < 7; i++) {
+		printd("%x ", inode->i_zone[i]);
+	}
+	if (blknr<7) {
+		printd(")direct\n");
+		return check_zone_nr(inode->i_zone + blknr, &changed);
+	}
+	blknr -= 7;
+	if (blknr<512) {
+		printd(")ind\n");
+		block = check_zone_nr(inode->i_zone + 7, &changed);
+		read_block(block, (char *) ind);
+		blk_chg = 0;
+		result = check_zone_nr(blknr + ind, &blk_chg);
+		if (blk_chg)
+			fsck_write_block(block, (char *) ind);
+		return result;
+	}
+	printd(")dind\n");
+	blknr -= 512;
+	block = check_zone_nr(inode->i_zone + 8, &changed);
+	read_block(block, (char *) dind);
+	blk_chg = 0;
+	result = check_zone_nr(dind + (blknr/512), &blk_chg);
+	if (blk_chg)
+		fsck_write_block(block, (char *) dind);
+	block = result;
+	read_block(block, (char *) ind);
+	blk_chg = 0;
+	result = check_zone_nr(ind + (blknr%512), &blk_chg);
+	if (blk_chg)
+		fsck_write_block(block, (char *) ind);
+	return result;
+}
+
+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.
+	 */
+	SupeP->s_state |= MINIX_VALID_FS;
+	if ( errors_uncorrected )
+		SupeP->s_state |= MINIX_ERROR_FS;
+	else
+		SupeP->s_state &= ~MINIX_ERROR_FS;
+	
+	if ((off_t)BLOCK_SIZE != lseek(IN, (off_t)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;
+}
+
+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");
+	unmap_inode_buffer();		
+/*	if (INODE_BUFFER_SIZE != write(IN,inode_buffer,INODE_BUFFER_SIZE))
+		die("Unable to write inodes"); RUBOUT */
+}
+
+void read_tables(void)
+{
+	int foo;
+/*	unsigned int inode_buffer_size = INODE_BUFFER_SIZE; RUBOUT */
+
+	memset(inode_map,0,sizeof(inode_map));
+	memset(zone_map,0,sizeof(zone_map));
+	if ((off_t)BLOCK_SIZE != (off_t)lseek(IN, (off_t)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; RUBOUT */
+/*		dirsize = 16; RUBOUT */
+	} else {
+		die("bad magic number in super-block");
+	}
+	/*else if (MAGIC == MINIX_SUPER_MAGIC2) { RUBOUT
+		namelen = 30;
+		dirsize = 32;
+	} else */
+	if (ZONESIZE != 0/* || BLOCK_SIZE != 1024*/)
+		die("Only 1k blocks/zones supported");
+	if (!IMAPS || IMAPS > MINIX_I_MAP_SLOTS)
+		die("bad s_imap_blocks field in super-block");
+	if (!ZMAPS || ZMAPS > MINIX_Z_MAP_SLOTS)
+		die("bad s_zmap_blocks field in super-block");
+/*	inode_buffer = malloc(BLOCK_SIZE); RUBOUT */
+	if (!inode_buffer)
+		die("Unable to allocate buffer for inodes");
+	inode_count = malloc(INODES);
+	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 != (foo = read(IN,inode_buffer,inode_buffer_size))) {
+		die("Unable to read inodes");
+	} RUBOUT */
+	if (NORM_FIRSTZONE != FIRSTZONE) {
+		printf("Warning: Firstzone != Norm_firstzone\n");
+		errors_uncorrected = 1;
+	}
+	if (show) {
+		printf("%d inodes\n",INODES);
+		printf("%d blocks\n",ZONES);
+		printf("Pre-zone blocks 2+%d+%d+%d %d\n", IMAPS, ZMAPS, INODE_BLOCKS, NORM_FIRSTZONE);
+		printf("Firstdatazone=%d (%d)\n",FIRSTZONE,NORM_FIRSTZONE);
+		printf("Zonesize=%d\n",BLOCK_SIZE<<ZONESIZE);
+		printf("Maxsize=%ld\n",MAXSIZE);
+		printf("Filesystem state=%d\n", SupeP->s_state);
+		printf("namelen=14\n\n"); /* RUBOUT */
+	}
+}
+
+struct minix_inode * get_inode(unsigned int nr)
+{
+	struct minix_inode * inode;
+
+	if (!nr || nr >= INODES)
+		return NULL;
+	total++;
+/*	inode = Inode + nr; RUBOUT */
+	inode = map_inode(nr);
+	if (!inode_count[nr]) {
+		if (!inode_in_use(nr)) {
+			printf("Inode %d marked not used, but used for file '",
+				nr);
+			print_current_name();
+			printf("'\n");
+			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 {
+                        print_current_name();
+                        printf(" has mode %05o\n",inode->i_mode);
+                }
+
+	} else
+		links++;
+	if (!++inode_count[nr]) {
+		printf("Warning: inode count too big.\n");
+		inode_count[nr]--;
+		errors_uncorrected = 1;
+	}
+	return inode;
+}
+
+void check_root(void)
+{
+/*	struct minix_inode * inode = Inode + ROOT_INO; RUBOUT */
+	struct minix_inode * inode = map_inode(ROOT_INO);
+
+	if (!inode || !S_ISDIR(inode->i_mode))
+		die("root inode isn't a directory");
+	printf("Root inode is a directory.\n");
+}
+
+static int add_zone(unsigned short * znr, int * corrected)
+{
+	int result;
+	int block;
+
+	printd("add_zone %d\n", * znr);
+	result = 0;
+	block = check_zone_nr(znr, corrected);
+	if (!block)
+		return 0;
+	if (zone_count[block]) {
+		printf("Block has been used before. Now in file `");
+		print_current_name();
+		printf("'.");
+		if (ask("Clear",1)) {
+			*znr = 0;
+			block = 0;
+			*corrected = 1;
+		}
+	}
+	if (!block)
+		return 0;
+	if (!zone_in_use(block)) {
+		printf("Block %d in file `",block);
+		print_current_name();
+		printf("' is marked not in use.");
+		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;
+
+	printd("add_zone_ind %d\n", * znr);
+	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)
+		fsck_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;
+
+	printd("add_zone_dind %d\n", * znr);
+	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)
+		fsck_write_block(block, blk);
+}
+
+void check_zones(unsigned int i)
+{
+	struct minix_inode * inode;
+
+	printd("check_zones\n");
+	if (!i || i >= INODES)
+		return;
+	if (inode_count[i] > 1)	/* have we counted this file already? */
+		return;
+/*	inode = Inode + i; RUBOUT */
+	inode = map_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);
+	printd("check_zones_end\n");
+}
+
+void fsck_check_file(struct minix_inode * dir, unsigned long offset)
+{
+	static char blk[BLOCK_SIZE];
+	struct minix_inode * inode;
+	int ino;
+	char * name;
+	unsigned int block;
+
+	block = map_block(dir,(unsigned int)(offset >> 10));
+	read_block(block, blk);
+	name = blk + (offset % BLOCK_SIZE);
+	ino = * (unsigned short *) (name);
+	name += 2;
+/*	ino = * (unsigned short *) blk; */
+	printd("check_file %x %lx ",ino, offset);
+	printd("\n");
+	if (ino >= INODES) {
+		print_current_name();
+		printf(" contains a bad inode number %d for file '", ino);
+		printf("%.*s'.",14,name); /* FIXME 14 can be integrated */
+		if (ask(" Remove",1)) {
+			*(unsigned short *)(name-2) = 0;
+			fsck_write_block(block, blk);
+		}
+		ino = 0;
+	}	
+	inode = get_inode(ino);
+	if (offset == 0L)
+		if (!inode || strcmp(".",name)) {
+			print_current_name();
+			printf(": bad directory: '.' isn't first\n");
+			errors_uncorrected = 1;
+		} else return;
+	if (offset == (unsigned long)DIRSIZE)
+		if (!inode || strcmp("..",name)) {
+			print_current_name();
+			printf(": bad directory: '..' isn't second\n");
+			errors_uncorrected = 1;
+		} else return;
+	if (!inode)
+		return;
+	if (name_depth < MAX_DEPTH)
+		strncpy(name_list[name_depth],name,NAMELEN);
+	name_depth++;	
+	print_current_name();
+	printf("\n");
+	if (list) {
+		if (verbose)
+			printf("%6d %07o %3d ",ino,inode->i_mode,inode->i_nlinks);
+		print_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;
+}
+
+void recursive_check(unsigned int ino)
+{
+	struct minix_inode * dir;
+	struct minix_inode mdir;
+	unsigned long offset;
+
+	printd("recursive_check %d\n", ino);
+/*	dir = Inode + ino; */
+	dir = map_inode(ino);
+	memcpy(&mdir, dir, sizeof(struct minix_inode));
+	dir = &mdir;
+	if (!S_ISDIR(dir->i_mode))
+		die("internal error");
+	if (dir->i_size < 32L) {
+		print_current_name();
+		printf(": bad directory: size<32");
+		errors_uncorrected = 1;
+	}
+	for (offset = 0 ; offset < dir->i_size ; offset += DIRSIZE)
+		fsck_check_file(dir,offset);
+}
+
+int bad_zone(int i)
+{
+	char buffer[1024];
+	off_t dest = (off_t)BLOCK_SIZE * i;
+
+	printd("bad_zone %d\n", i);
+	if (dest != lseek(IN, dest, SEEK_SET))
+		die("seek failed in bad_zone");
+	return (BLOCK_SIZE != read(IN, buffer, BLOCK_SIZE));
+}
+
+void check_counts(void)
+{
+	int i;
+
+	printd("check_counts\n");
+	for (i=1 ; i < INODES ; i++) {
+		struct minix_inode * inode = map_inode(i);
+		if (!inode_in_use(i) && inode->i_mode && warn_mode) {
+			printf("Inode %d mode not cleared.",i);
+			if (ask("Clear",1)) {
+				inode->i_mode = 0;
+				mapped_dirty++;
+				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_nlinks != inode_count[i]) {
+			printf("Inode %d (mode = %07o), i_nlinks=%d, counted=%d.",
+				i,inode->i_mode,inode->i_nlinks,inode_count[i]);
+			if (ask("Set i_nlinks to count",1)) {
+				inode->i_nlinks=inode_count[i];
+				mapped_dirty++;
+				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;
+		}
+		printf("Zone %d: %sin use, counted=%d\n",
+		i,zone_in_use(i)?"":"not ",zone_count[i]);
+	}
+}
+
+int fsck_main(int argc, char ** argv)
+{
+	struct termios termios,tmp;
+	int i;
+	int count;
+	int retcode = 0;
+
+	if (argc && *argv)
+		program_name = *argv;
+	if (INODE_SIZE * MINIX_INODES_PER_BLOCK != BLOCK_SIZE)
+		die("bad 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();
+	if (repair && !automatic) {
+		if (!isatty(0) || !isatty(1))
+			die("need terminal for interactive repairs");
+		tcgetattr(0,&termios);
+		tmp = termios;
+		tmp.c_lflag &= ~(ICANON|ECHO);
+		tcsetattr(0,TCSANOW,&tmp);
+	}
+	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_tables();
+
+	/*
+	 * 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.
+	 */
+	printf("%s, %s\n", program_name, program_version);
+	if ( !(SupeP->s_state & MINIX_ERROR_FS) && 
+	      (SupeP->s_state & MINIX_VALID_FS) && 
+	      !force ) {
+		if (repair)
+			printf("%s is clean, no check.\n", device_name);
+		if (repair && !automatic)
+			tcsetattr(0,TCSANOW,&termios);
+		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);
+
+	check_root();
+	/* Next 6 lines used to be a pointless check() function */
+	printd("check\n");
+	memset(inode_count,0,INODES*sizeof(*inode_count));
+	memset(zone_count,0,ZONES*sizeof(*zone_count));
+	check_zones(ROOT_INO);
+	recursive_check(ROOT_INO);
+
+	check_counts();
+	if (verbose) {
+		int i, free;
+
+		for (i=1,free=0 ; i < INODES ; i++)
+			if (!inode_in_use(i))
+				free++;
+		printf("\n%6d inodes used (%d%%)\n",(INODES-free-1),
+			100*(INODES-free-1)/(INODES-1));
+		for (i=FIRSTZONE,free=0 ; i < ZONES ; i++)
+			if (!zone_in_use(i))
+				free++;
+		printf("%6d zones used (%d%%)\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;
+}