/*      $NetBSD: dtfs.c,v 1.2 2010/07/21 06:58:25 pooka Exp $   */

/*
 * Copyright (c) 2006  Antti Kantee.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/*
 * Delectable Test File System: a simple in-memory file system which
 * demonstrates the use of puffs.
 * (a.k.a. Detrempe FS ...)
 */

#include <sys/types.h>

#include <err.h>
#include <mntopts.h>
#include <paths.h>
#include <puffs.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "dtfs.h"

#ifdef DEEP_ROOTED_CLUE
#define FSNAME "detrempe"
#else
#define FSNAME "dt"
#endif
#define MAXREQMAGIC -37

static struct puffs_usermount *gpu;
static struct dtfs_mount gdtm;
int dynamicfh;
int straightflush;

static void usage(void);

static void
usage()
{

        fprintf(stderr, "usage: %s [-bsdftl] [-c hashbuckets] [-m maxreqsize] "
            "[-n typename]\n       [-o mntopt] [-o puffsopt] [-p prot] "
            "[-r rootnodetype]\n       detrempe /mountpoint\n", getprogname());
        exit(1);
}

static void
wipe_the_sleep_out_of_my_eyes(int v)
{

        gdtm.dtm_needwakeup++;
}

static void
loopfun(struct puffs_usermount *pu)
{
        struct dtfs_mount *dtm = puffs_getspecific(pu);
        struct dtfs_poll *dp;

        while (dtm->dtm_needwakeup) {
                dtm->dtm_needwakeup--;
                dp = LIST_FIRST(&dtm->dtm_pollent);
                if (dp == NULL)
                        return;

                LIST_REMOVE(dp, dp_entries);
                puffs_cc_continue(dp->dp_pcc);
        }
}

int
main(int argc, char *argv[])
{
        extern char *optarg;
        extern int optind;
        struct puffs_usermount *pu;
        struct puffs_pathobj *po_root;
        struct puffs_ops *pops;
        struct timespec ts;
        const char *typename;
        char *rtstr;
        mntoptparse_t mp;
        int pflags, detach, mntflags;
        int ch;
        int khashbuckets;
        int maxreqsize;

        setprogname(argv[0]);

        rtstr = NULL;
        detach = 1;
        mntflags = 0;
        khashbuckets = 256;
        pflags = PUFFS_KFLAG_IAONDEMAND;
        typename = FSNAME;
        maxreqsize = MAXREQMAGIC;
        gdtm.dtm_allowprot = VM_PROT_ALL;
        while ((ch = getopt(argc, argv, "bc:dfilm:n:o:p:r:st")) != -1) {
                switch (ch) {
                case 'b': /* build paths, for debugging the feature */
                        pflags |= PUFFS_FLAG_BUILDPATH;
                        break;
                case 'c':
                        khashbuckets = atoi(optarg);
                        break;
                case 'd':
                        dynamicfh = 1;
                        break;
                case 'f':
                        pflags |= PUFFS_KFLAG_LOOKUP_FULLPNBUF;
                        break;
                case 'i':
                        pflags &= ~PUFFS_KFLAG_IAONDEMAND;
                        break;
                case 'l':
                        straightflush = 1;
                        break;
                case 'm':
                        maxreqsize = atoi(optarg);
                        break;
                case 'n':
                        typename = optarg;
                        break;
                case 'o':
                        mp = getmntopts(optarg, puffsmopts, &mntflags, &pflags);
                        if (mp == NULL)
                                err(1, "getmntopts");
                        freemntopts(mp);
                        break;
                case 'p':
                        gdtm.dtm_allowprot = atoi(optarg);
                        if ((gdtm.dtm_allowprot | VM_PROT_ALL) != VM_PROT_ALL)
                                usage();
                        break;
                case 'r':
                        rtstr = optarg;
                        break;
                case 's': /* stay on top */
                        detach = 0;
                        break;
                case 't':
                        pflags |= PUFFS_KFLAG_WTCACHE;
                        break;
                default:
                        usage();
                        /*NOTREACHED*/
                }
        }
        if (pflags & PUFFS_FLAG_OPDUMP)
                detach = 0;
        argc -= optind;
        argv += optind;

        if (argc != 2)
                usage();

        PUFFSOP_INIT(pops);

        PUFFSOP_SET(pops, dtfs, fs, statvfs);
        PUFFSOP_SET(pops, dtfs, fs, unmount);
        PUFFSOP_SETFSNOP(pops, sync);
        PUFFSOP_SET(pops, dtfs, fs, fhtonode);
        PUFFSOP_SET(pops, dtfs, fs, nodetofh);

        PUFFSOP_SET(pops, dtfs, node, lookup);
        PUFFSOP_SET(pops, dtfs, node, access);
        PUFFSOP_SET(pops, puffs_genfs, node, getattr);
        PUFFSOP_SET(pops, dtfs, node, setattr);
        PUFFSOP_SET(pops, dtfs, node, create);
        PUFFSOP_SET(pops, dtfs, node, remove);
        PUFFSOP_SET(pops, dtfs, node, readdir);
        PUFFSOP_SET(pops, dtfs, node, poll);
        PUFFSOP_SET(pops, dtfs, node, mmap);
        PUFFSOP_SET(pops, dtfs, node, mkdir);
        PUFFSOP_SET(pops, dtfs, node, rmdir);
        PUFFSOP_SET(pops, dtfs, node, rename);
        PUFFSOP_SET(pops, dtfs, node, read);
        PUFFSOP_SET(pops, dtfs, node, write);
        PUFFSOP_SET(pops, dtfs, node, link);
        PUFFSOP_SET(pops, dtfs, node, symlink);
        PUFFSOP_SET(pops, dtfs, node, readlink);
        PUFFSOP_SET(pops, dtfs, node, mknod);
        PUFFSOP_SET(pops, dtfs, node, inactive);
        PUFFSOP_SET(pops, dtfs, node, pathconf);
        PUFFSOP_SET(pops, dtfs, node, reclaim);

        srandom(time(NULL)); /* for random generation numbers */

        pu = puffs_init(pops, _PATH_PUFFS, typename, &gdtm, pflags);
        if (pu == NULL)
                err(1, "init");
        gpu = pu;

        puffs_setfhsize(pu, sizeof(struct dtfs_fid),
            PUFFS_FHFLAG_NFSV2 | PUFFS_FHFLAG_NFSV3
            | (dynamicfh ? PUFFS_FHFLAG_DYNAMIC : 0));
        puffs_setncookiehash(pu, khashbuckets);

        if (signal(SIGALRM, wipe_the_sleep_out_of_my_eyes) == SIG_ERR)
                warn("cannot set alarm sighandler");

        /* init */
        if (dtfs_domount(pu, rtstr) != 0)
                errx(1, "dtfs_domount failed");

        po_root = puffs_getrootpathobj(pu);
        po_root->po_path = argv[0];
        po_root->po_len = strlen(argv[0]);

        /* often enough for testing poll */
        ts.tv_sec = 1;
        ts.tv_nsec = 0;
        puffs_ml_setloopfn(pu, loopfun);
        puffs_ml_settimeout(pu, &ts);

        if (maxreqsize != MAXREQMAGIC)
                puffs_setmaxreqlen(pu, maxreqsize);

        puffs_set_errnotify(pu, puffs_kernerr_abort);
        if (detach)
                if (puffs_daemon(pu, 1, 1) == -1)
                        err(1, "puffs_daemon");

        if (puffs_mount(pu,  argv[1], mntflags, puffs_getroot(pu)) == -1)
                err(1, "mount");
        if (puffs_mainloop(pu) == -1)
                err(1, "mainloop");

        return 0;
}