/* $NetBSD: main.c,v 1.15 2003/08/07 10:04:23 agc Exp $	 */

/*
 * Copyright (c) 1980, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/time.h>
#include <sys/mount.h>
#include <ufs/ufs/dinode.h>
#include <sys/mount.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/lfs/lfs.h>

#include <fstab.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include <unistd.h>
#include <err.h>

#include "fsck.h"
#include "extern.h"
#include "fsutil.h"

int returntosingle;

int main(int, char *[]);

static int argtoi(int, char *, char *, int);
static int checkfilesys(const char *, char *, long, int);
static void usage(void);
extern void (*panic_func)(int, const char *, va_list);

int
main(int argc, char **argv)
{
	int ch;
	int ret = 0;
	char *optstring = "b:dfi:m:npy";

	sync();
	skipclean = 1;
	exitonfail = 0;
	idaddr = 0x0;
	panic_func = vmsg;
	while ((ch = getopt(argc, argv, optstring)) != -1) {
		switch (ch) {
		case 'b':
			skipclean = 0;
			bflag = argtoi('b', "number", optarg, 0);
			printf("Alternate super block location: %d\n", bflag);
			break;
		case 'd':
			debug++;
			break;
		case 'e':
			exitonfail++;
			break;
		case 'f':
			skipclean = 0;
			break;
		case 'i':
			idaddr = strtol(optarg, NULL, 0);
			break;
		case 'm':
			lfmode = argtoi('m', "mode", optarg, 8);
			if (lfmode & ~07777)
				err(1, "bad mode to -m: %o\n", lfmode);
			printf("** lost+found creation mode %o\n", lfmode);
			break;

		case 'n':
			nflag++;
			yflag = 0;
			break;

		case 'p':
			preen++;
			break;

		case 'y':
			yflag++;
			nflag = 0;
			break;

		default:
			usage();
		}
	}

	argc -= optind;
	argv += optind;

	if (!argc)
		usage();

	if (signal(SIGINT, SIG_IGN) != SIG_IGN)
		(void) signal(SIGINT, catch);
	if (preen)
		(void) signal(SIGQUIT, catchquit);

	while (argc-- > 0)
		(void) checkfilesys(blockcheck(*argv++), 0, 0L, 0);

	if (returntosingle)
		ret = 2;

	exit(ret);
}

static int
argtoi(int flag, char *req, char *str, int base)
{
	char *cp;
	int ret;

	ret = (int) strtol(str, &cp, base);
	if (cp == str || *cp)
		err(1, "-%c flag requires a %s\n", flag, req);
	return (ret);
}

/*
 * Check the specified filesystem.
 */

/* ARGSUSED */
static int
checkfilesys(const char *filesys, char *mntpt, long auxdata, int child)
{
	struct dups *dp;
	struct zlncnt *zlnp;

	if (preen && child)
		(void) signal(SIGQUIT, voidquit);
	setcdevname(filesys, preen);
	if (debug && preen)
		pwarn("starting\n");
	switch (setup(filesys)) {
	case 0:
		if (preen)
			pfatal("CAN'T CHECK FILE SYSTEM.");
	case -1:
		return (0);
	}

	/*
	 * For LFS, "preen" means "roll forward".  We don't check anything
	 * else.
	 */
	if (preen == 0) {
		printf("** Last Mounted on %s\n", fs->lfs_fsmnt);
		if (hotroot())
			printf("** Root file system\n");
		/*
		 * 0: check segment checksums, inode ranges
		 */
		printf("** Phase 0 - Check Segment Summaries and Inode Free List\n");
	}
	if (idaddr)
		pwarn("-i given, skipping free list check\n");
	else
		pass0();

	if (preen == 0) {
		/*
		 * 1: scan inodes tallying blocks used
		 */
		printf("** Phase 1 - Check Blocks and Sizes\n");
		pass1();

		/*
		 * 2: traverse directories from root to mark all connected directories
		 */
		printf("** Phase 2 - Check Pathnames\n");
		pass2();

		/*
		 * 3: scan inodes looking for disconnected directories
		 */
		printf("** Phase 3 - Check Connectivity\n");
		pass3();

		/*
		 * 4: scan inodes looking for disconnected files; check reference counts
		 */
		printf("** Phase 4 - Check Reference Counts\n");
		pass4();

		/*
		 * 5: check segment byte totals and dirty flags
		 */
		printf("** Phase 5 - Check Segment Block Accounting\n");
		pass5();

		if (debug) {
			if (duplist != NULL) {
				printf("The following duplicate blocks remain:");
				for (dp = duplist; dp; dp = dp->next)
					printf(" %lld,", (long long) dp->dup);
				printf("\n");
			}
			if (zlnhead != NULL) {
				printf("The following zero link count inodes remain:");
				for (zlnp = zlnhead; zlnp; zlnp = zlnp->next)
					printf(" %u,", zlnp->zlncnt);
				printf("\n");
			}
		}
	}
	if (!rerun) {
		if (!preen)
			printf("** Phase 6 - Roll Forward\n");
		pass6();
	}
	zlnhead = (struct zlncnt *) 0;
	duplist = (struct dups *) 0;
	muldup = (struct dups *) 0;
	inocleanup();

	/*
	 * print out summary statistics
	 */
	pwarn("%d files, %lld used, %lld free\n",
	    n_files, (long long) n_blks,
	    (long long) fs->lfs_bfree);

	ckfini(1);

	free(blockmap);
	free(statemap);
	free((char *)lncntp);
	if (!fsmodified) {
		return (0);
	}
	if (!preen)
		printf("\n***** FILE SYSTEM WAS MODIFIED *****\n");
	if (rerun)
		printf("\n***** PLEASE RERUN FSCK *****\n");
	if (hotroot()) {
		struct statfs stfs_buf;
		/*
		 * We modified the root.  Do a mount update on
		 * it, unless it is read-write, so we can continue.
		 */
		if (statfs("/", &stfs_buf) == 0) {
			long flags = stfs_buf.f_flags;
			struct ufs_args args;
			int ret;

			if (flags & MNT_RDONLY) {
				args.fspec = 0;
				args.export.ex_flags = 0;
				args.export.ex_root = 0;
				flags |= MNT_UPDATE | MNT_RELOAD;
				ret = mount(MOUNT_LFS, "/", flags, &args);
				if (ret == 0)
					return (0);
			}
		}
		if (!preen)
			printf("\n***** REBOOT NOW *****\n");
		sync();
		return (4);
	}
	return (0);
}

static void
usage()
{

	(void) fprintf(stderr,
	    "Usage: %s [-dnpy] [-b block] [-m mode] filesystem ...\n",
	    getprogname());
	exit(1);
}