/*
 * 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.
 *
 * @(#) Copyright (c) 1980, 1986, 1993 The Regents of the University of California.  All rights reserved.
 * @(#)main.c	8.6 (Berkeley) 5/14/95
 * $FreeBSD: src/sbin/fsck/main.c,v 1.21.2.1 2001/01/23 23:11:07 iedowse Exp $
 */

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/mount.h>
#include <sys/resource.h>

#include <vfs/ufs/dinode.h>
#include <vfs/ufs/ufsmount.h>
#include <vfs/ufs/fs.h>

#include <err.h>
#include <errno.h>
#include <fstab.h>
#include <paths.h>
#include <string.h>

#include "fsck.h"

int	returntosingle;		/* 1 => return to single user mode on exit */
int	lastmntonly;		/* Output the last mounted on only */

static int argtoi(int flag, char *req, char *str, int base);
static int docheck(struct fstab *fsp);
static int checkfilesys(char *filesys, char *mntpt, long auxdata,
		int child);
static struct statfs *getmntpt(const char *);

int
main(int argc, char **argv)
{
	int ch;
	int ret, maxrun = 0;
	struct rlimit rlimit;

	sync();
	while ((ch = getopt(argc, argv, "dfLpnNyYb:c:l:m:")) != -1) {
		switch (ch) {
		case 'p':
			preen++;
			break;

		case 'b':
			bflag = argtoi('b', "number", optarg, 10);
			printf("Alternate super block location: %d\n", bflag);
			break;

		case 'c':
			cvtlevel = argtoi('c', "conversion level", optarg, 10);
			break;

		case 'd':
			debug++;
			break;

		case 'f':
			fflag++;
			break;

		case 'l':
			maxrun = argtoi('l', "number", optarg, 10);
			break;

		case 'L':
			lastmntonly++;
			break;

		case 'm':
			lfmode = argtoi('m', "mode", optarg, 8);
			if (lfmode &~ 07777)
				errx(EEXIT, "bad mode to -m: %o", lfmode);
			printf("** lost+found creation mode %o\n", lfmode);
			break;

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

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

		default:
			errx(EEXIT, "%c option?", ch);
		}
	}
	argc -= optind;
	argv += optind;
	if (signal(SIGINT, SIG_IGN) != SIG_IGN)
		signal(SIGINT, catch);
	if (preen)
		signal(SIGQUIT, catchquit);
	signal(SIGINFO, infohandler);
	/*
	 * Push up our allowed memory limit so we can cope
	 * with huge filesystems.
	 */
	if (getrlimit(RLIMIT_DATA, &rlimit) == 0) {
		rlimit.rlim_cur = rlimit.rlim_max;
		setrlimit(RLIMIT_DATA, &rlimit);
	}
	if (argc) {
		while (argc-- > 0) {
			char *path = blockcheck(*argv);

			if (path == NULL)
				pfatal("Can't check %s\n", *argv);
			else
				checkfilesys(path, 0, 0L, 0);
			++argv;
		}
		exit(0);
	}
	ret = checkfstab(preen, maxrun, docheck, checkfilesys);
	if (returntosingle)
		exit(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)
		errx(EEXIT, "-%c flag requires a %s", flag, req);
	return (ret);
}

/*
 * Determine whether a filesystem should be checked.
 */
static int
docheck(struct fstab *fsp)
{

	if (strcmp(fsp->fs_vfstype, "ufs") ||
	    (strcmp(fsp->fs_type, FSTAB_RW) &&
	     strcmp(fsp->fs_type, FSTAB_RO)) ||
	    fsp->fs_passno == 0)
		return (0);
	return (1);
}

/*
 * Check the specified filesystem.
 */
/* ARGSUSED */
static int
checkfilesys(char *filesys, char *mntpt, long auxdata, int child)
{
	ufs_daddr_t n_ffree, n_bfree;
	struct dups *dp;
	struct statfs *mntbuf;
	struct zlncnt *zlnp;
	int cylno;

	if (preen && child)
		signal(SIGQUIT, voidquit);
	cdevname = filesys;
	if (debug && preen)
		pwarn("starting\n");
	switch (setup(filesys)) {
	case 0:
		if (preen)
			pfatal("CAN'T CHECK FILE SYSTEM.");
		return (0);
	case -1:
		pwarn("clean, %d free ", sblock.fs_cstotal.cs_nffree +
		    sblock.fs_frag * sblock.fs_cstotal.cs_nbfree);
		printf("(%d frags, %d blocks, %.1f%% fragmentation)\n",
		    sblock.fs_cstotal.cs_nffree, sblock.fs_cstotal.cs_nbfree,
		    sblock.fs_cstotal.cs_nffree * 100.0 / sblock.fs_dsize);
		return (0);
	}
	got_siginfo = 0;

	/*
	 * Get the mount point information of the filesystem, if
	 * it is available.
	 */
	mntbuf = getmntpt(filesys);
	
	/*
	 * Cleared if any questions answered no. Used to decide if
	 * the superblock should be marked clean.
	 */
	resolved = 1;
	/*
	 * 1: scan inodes tallying blocks used
	 */
	if (lastmntonly) {
		printf("** %s Last Mounted on %s\n", filesys, sblock.fs_fsmnt);
		return (0);
	}
	if (preen == 0) {
		printf("** Last Mounted on %s\n", sblock.fs_fsmnt);
		if (mntbuf != NULL && mntbuf->f_flags & MNT_ROOTFS)
			printf("** Root file system\n");
		printf("** Phase 1 - Check Blocks and Sizes\n");
	}
	pass1();

	/*
	 * 1b: locate first references to duplicates, if any
	 */
	if (duplist) {
		if (preen || usedsoftdep)
			pfatal("INTERNAL ERROR: dups with -p");
		printf("** Phase 1b - Rescan For More DUPS\n");
		pass1b();
	}

	/*
	 * 2: traverse directories from root to mark all connected directories
	 */
	if (preen == 0)
		printf("** Phase 2 - Check Pathnames\n");
	pass2();

	/*
	 * 3: scan inodes looking for disconnected directories
	 */
	if (preen == 0)
		printf("** Phase 3 - Check Connectivity\n");
	pass3();

	/*
	 * 4: scan inodes looking for disconnected files; check reference counts
	 */
	if (preen == 0)
		printf("** Phase 4 - Check Reference Counts\n");
	pass4();

	/*
	 * 5: check and repair resource counts in cylinder groups
	 */
	if (preen == 0)
		printf("** Phase 5 - Check Cyl groups\n");
	pass5();

	/*
	 * print out summary statistics
	 */
	n_ffree = sblock.fs_cstotal.cs_nffree;
	n_bfree = sblock.fs_cstotal.cs_nbfree;
	pwarn("%d files, %d used, %d free ",
	    n_files, n_blks, n_ffree + sblock.fs_frag * n_bfree);
	printf("(%d frags, %d blocks, %.1f%% fragmentation)\n",
	    n_ffree, n_bfree, n_ffree * 100.0 / sblock.fs_dsize);
	if (debug &&
	    (n_files -= maxino - UFS_ROOTINO - sblock.fs_cstotal.cs_nifree))
		printf("%d files missing\n", n_files);
	if (debug) {
		n_blks += sblock.fs_ncg *
			(cgdmin(&sblock, 0) - cgsblock(&sblock, 0));
		n_blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0);
		n_blks += howmany(sblock.fs_cssize, sblock.fs_fsize);
		if (n_blks -= maxfsblock - (n_ffree + sblock.fs_frag * n_bfree))
			printf("%d blocks missing\n", n_blks);
		if (duplist != NULL) {
			printf("The following duplicate blocks remain:");
			for (dp = duplist; dp; dp = dp->next)
				printf(" %d,", 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");
		}
	}
	zlnhead = NULL;
	duplist = NULL;
	muldup = NULL;
	inocleanup();
	if (fsmodified) {
		sblock.fs_time = time(NULL);
		sbdirty();
	}
	if (cvtlevel && sblk.b_dirty) {
		/*
		 * Write out the duplicate super blocks
		 */
		for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
			bwrite(fswritefd, (char *)&sblock,
			    fsbtodb(&sblock, cgsblock(&sblock, cylno)), SBSIZE);
	}
	if (rerun)
		resolved = 0;

	/*
	 * Check to see if the filesystem is mounted read-write.
	 */
	if (mntbuf != NULL && (mntbuf->f_flags & MNT_RDONLY) == 0)
		resolved = 0;
	ckfini(resolved);

	for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
		if (inostathead[cylno].il_stat != NULL)
			free((char *)inostathead[cylno].il_stat);
	free((char *)inostathead);
	inostathead = NULL;
	if (fsmodified && !preen)
		printf("\n***** FILE SYSTEM WAS MODIFIED *****\n");
	if (rerun)
		printf("\n***** PLEASE RERUN FSCK *****\n");
	if (mntbuf != NULL) {
		struct ufs_args args;
		int ret;
		/*
		 * We modified a mounted filesystem.  Do a mount update on
		 * it unless it is read-write, so we can continue using it
		 * as safely as possible.
		 */
		if (mntbuf->f_flags & MNT_RDONLY) {
			args.fspec = 0;
			args.export.ex_flags = 0;
			args.export.ex_root = 0;
			ret = mount("ufs", mntbuf->f_mntonname,
			    mntbuf->f_flags | MNT_UPDATE | MNT_RELOAD, &args);
			if (ret == 0)
				return (0);
			pwarn("mount reload of '%s' failed: %s\n\n",
			    mntbuf->f_mntonname, strerror(errno));
		}
		if (!fsmodified)
			return (0);
		if (!preen)
			printf("\n***** REBOOT NOW *****\n");
		sync();
		return (4);
	}
	return (0);
}

/*
 * Get the directory that the device is mounted on.
 */
static struct statfs *
getmntpt(const char *name)
{
	struct stat devstat, mntdevstat;
	char device[sizeof(_PATH_DEV) - 1 + MNAMELEN];
	char *devname;
	struct statfs *mntbuf;
	int i, mntsize;

	if (stat(name, &devstat) != 0 ||
	    !(S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode)))
		return (NULL);
	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
	for (i = 0; i < mntsize; i++) {
		if (strcmp(mntbuf[i].f_fstypename, "ufs") != 0)
			continue;
		devname = mntbuf[i].f_mntfromname;
		if (*devname != '/') {
			strcpy(device, _PATH_DEV);
			strcat(device, devname);
			devname = device;
		}
		if (stat(devname, &mntdevstat) == 0 &&
		    mntdevstat.st_rdev == devstat.st_rdev)
			return (&mntbuf[i]);
	}
	return (NULL);
}