/*      $NetBSD: mount_lfs.c,v 1.40 2026/02/11 14:28:14 christos Exp $  */

/*-
 * Copyright (c) 1993, 1994
 *      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/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1993, 1994\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)mount_lfs.c 8.4 (Berkeley) 4/26/95";
#else
__RCSID("$NetBSD: mount_lfs.c,v 1.40 2026/02/11 14:28:14 christos Exp $");
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/mount.h>

#include <ufs/lfs/lfs.h>

#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <paths.h>

#include <signal.h>

#include <mntopts.h>
#include "pathnames.h"
#include "mountprog.h"
#include "mount_lfs.h"

static const struct mntopt mopts[] = {
        MOPT_STDOPTS,
        MOPT_UPDATE,
        MOPT_GETARGS,
        MOPT_NOATIME,
        MOPT_RELATIME,
        MOPT_NULL,
};

__dead static void      usage(void);

#ifdef WANT_CLEANER
__dead static void      invoke_cleaner(char *);
static void     kill_daemon(char *);
static void     kill_cleaner(char *);
#endif /* WANT_CLEANER */

static int short_rds, cleaner_debug, cleaner_bytes, fs_idle, noclean;
static const char *nsegs;

#ifndef MOUNT_NOMAIN
int
main(int argc, char **argv)
{

        setprogname(argv[0]);
        return mount_lfs(argc, argv);
}
#endif

void
mount_lfs_parseargs(int argc, char *argv[],
        struct ulfs_args *args, int *mntflags,
        char *canon_dev, char *canon_dir)
{
        int ch;
        mntoptparse_t mp;

        memset(args, 0, sizeof(*args));
        nsegs = "4";
        *mntflags = noclean = 0;
        cleaner_bytes = 1;
        while ((ch = getopt(argc, argv, "bdiN:no:s")) != -1)
                switch (ch) {
                case 'b':
                        cleaner_bytes = !cleaner_bytes;
                        break;
                case 'd':
                        cleaner_debug = 1;
                        break;
                case 'i':
                        fs_idle = 1;
                        break;
                case 'n':
                        noclean = 1;
                        break;
                case 'N':
                        nsegs = optarg;
                        break;
                case 'o':
                        mp = getmntopts(optarg, mopts, mntflags, 0);
                        if (mp == NULL)
                                err(EXIT_FAILURE, "getmntopts");
                        freemntopts(mp);
                        break;
                case 's':
                        short_rds = 1;
                        break;
                case '?':
                default:
                        usage();
                }
        argc -= optind;
        argv += optind;

        if (argc != 2)
                usage();

        pathadj(argv[0], canon_dev);
        args->fspec = canon_dev;

        pathadj(argv[1], canon_dir);
}

int
mount_lfs(int argc, char *argv[])
{
        struct ulfs_args args;
        int mntflags;
        int mntsize, oldflags, i;
        char fs_name[MAXPATHLEN], canon_dev[MAXPATHLEN];
        struct statvfs *mntbuf;
        const char *errcause;

        mount_lfs_parseargs(argc, argv, &args, &mntflags, canon_dev, fs_name);

        /*
         * Record the previous status of this filesystem (if any) before
         * performing the mount, so we can know whether to start or
         * kill the cleaner process below.
         */
        oldflags = MNT_RDONLY; /* If not mounted, pretend r/o */
        if (mntflags & MNT_UPDATE) {
                if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
                        err(EXIT_FAILURE, "getmntinfo");
                for (i = 0; i < mntsize; i++) {
                        if (strcmp(mntbuf[i].f_mntfromname, args.fspec) == 0) {
                                oldflags = mntbuf[i].f_flag;
                                break;
                        }
                }
        }

        if (mount(MOUNT_LFS, fs_name, mntflags, &args, sizeof args) == -1) {
                switch (errno) {
                case EMFILE:
                        errcause = "mount table full";
                        break;
                case EINVAL:
                        if (mntflags & MNT_UPDATE)
                                errcause =
                            "specified device does not match mounted device";
                        else
                                errcause = "incorrect super block";
                        break;
                default:
                        errcause = strerror(errno);
                        break;
                }
                errx(EXIT_FAILURE, "%s on %s: %s", args.fspec, fs_name, errcause);
        }

#ifdef WANT_CLEANER
        /* Not mounting fresh or upgrading to r/w; don't start the cleaner */
        if (!(oldflags & MNT_RDONLY) || (mntflags & MNT_RDONLY)
            || (mntflags & MNT_GETARGS))
                noclean = 1;
        if (!noclean)
                invoke_cleaner(fs_name);
                /* NOTREACHED */

        /* Downgrade to r/o; kill the cleaner */
        if ((mntflags & MNT_RDONLY) && !(oldflags & MNT_RDONLY))
                kill_cleaner(fs_name);
#else
        __USE(oldflags);
#endif /* WANT_CLEANER */

        return EXIT_SUCCESS;
}

#ifdef WANT_CLEANER
static void
kill_daemon(char *pidname)
{
        FILE *fp;
        char s[80];
        pid_t pid;

        fp = fopen(pidname, "r");
        if (fp) {
                fgets(s, sizeof(s), fp);
                pid = atoi(s);
                if (pid)
                        kill(pid, SIGINT);
                fclose(fp);
        }
}

static void
kill_cleaner(char *name)
{
        char *pidname;
        char *cp;
        int off;

        /* Parent first */
        asprintf(&pidname, "%slfs_cleanerd:m:%s.pid", _PATH_VARRUN, name);
        if (!pidname)
                err(EXIT_FAILURE, "malloc");
        off = strlen(_PATH_VARRUN);
        while((cp = strchr(pidname + off, '/')) != NULL)
                *cp = '|';
        kill_daemon(pidname);
        free(pidname);

        /* Then child */
        asprintf(&pidname, "%slfs_cleanerd:s:%s.pid", _PATH_VARRUN, name);
        if (!pidname)
                err(EXIT_FAILURE, "malloc");
        off = strlen(_PATH_VARRUN);
        while((cp = strchr(pidname + off, '/')) != NULL)
                *cp = '|';
        kill_daemon(pidname);
        free(pidname);
}

static void
invoke_cleaner(char *name)
{
        const char *args[7], **ap = args;

        /* Build the argument list. */
        *ap++ = _PATH_LFS_CLEANERD;
        if (cleaner_bytes)
                *ap++ = "-b";
        if (nsegs) {
                *ap++ = "-n";
                *ap++ = nsegs;
        }
        if (short_rds)
                *ap++ = "-s";
        if (cleaner_debug)
                *ap++ = "-d";
        if (fs_idle)
                *ap++ = "-f";
        *ap++ = name;
        *ap = NULL;

        execv(args[0], __UNCONST(args));
        err(EXIT_FAILURE, "exec %s", _PATH_LFS_CLEANERD);
}
#endif /* WANT_CLEANER */

static void
usage(void)
{
        (void)fprintf(stderr,
                "usage: %s [-bdins] [-N nsegs] [-o options] special node\n",
                getprogname());
        exit(EXIT_FAILURE);
}