/*-
 * Copyright (c) 2014 The FreeBSD Foundation
 *
 * This software was developed by Edward Tomasz Napierala under sponsorship
 * from the FreeBSD Foundation.
 *
 * 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 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 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.
 *
 */
/*-
 * Copyright (c) 1989, 1991, 1993, 1995
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * 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/systm.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/dirent.h>
#include <sys/ioccom.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/mount.h>
#include <sys/refcount.h>
#include <sys/sx.h>
#include <sys/sysctl.h>
#include <sys/syscallsubr.h>
#include <sys/taskqueue.h>
#include <sys/tree.h>
#include <sys/vnode.h>
#include <machine/atomic.h>
#include <vm/uma.h>

#include <fs/autofs/autofs.h>
#include <fs/autofs/autofs_ioctl.h>

MALLOC_DEFINE(M_AUTOFS, "autofs", "Automounter filesystem");

uma_zone_t autofs_request_zone;
uma_zone_t autofs_node_zone;

static int      autofs_open(struct cdev *dev, int flags, int fmt,
                    struct thread *td);
static int      autofs_close(struct cdev *dev, int flag, int fmt,
                    struct thread *td);
static int      autofs_ioctl(struct cdev *dev, u_long cmd, caddr_t arg,
                    int mode, struct thread *td);

static struct cdevsw autofs_cdevsw = {
     .d_version = D_VERSION,
     .d_open   = autofs_open,
     .d_close   = autofs_close,
     .d_ioctl   = autofs_ioctl,
     .d_name    = "autofs",
};

/*
 * List of signals that can interrupt an autofs trigger.  Might be a good
 * idea to keep it synchronised with list in sys/fs/nfs/nfs_commonkrpc.c.
 */
int autofs_sig_set[] = {
        SIGINT,
        SIGTERM,
        SIGHUP,
        SIGKILL,
        SIGQUIT
};

struct autofs_softc     *autofs_softc;

SYSCTL_NODE(_vfs, OID_AUTO, autofs, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
    "Automounter filesystem");
int autofs_debug = 1;
TUNABLE_INT("vfs.autofs.debug", &autofs_debug);
SYSCTL_INT(_vfs_autofs, OID_AUTO, debug, CTLFLAG_RWTUN,
    &autofs_debug, 1, "Enable debug messages");
int autofs_mount_on_stat = 0;
TUNABLE_INT("vfs.autofs.mount_on_stat", &autofs_mount_on_stat);
SYSCTL_INT(_vfs_autofs, OID_AUTO, mount_on_stat, CTLFLAG_RWTUN,
    &autofs_mount_on_stat, 0, "Trigger mount on stat(2) on mountpoint");
int autofs_timeout = 30;
TUNABLE_INT("vfs.autofs.timeout", &autofs_timeout);
SYSCTL_INT(_vfs_autofs, OID_AUTO, timeout, CTLFLAG_RWTUN,
    &autofs_timeout, 30, "Number of seconds to wait for automountd(8)");
int autofs_cache = 600;
TUNABLE_INT("vfs.autofs.cache", &autofs_cache);
SYSCTL_INT(_vfs_autofs, OID_AUTO, cache, CTLFLAG_RWTUN,
    &autofs_cache, 600, "Number of seconds to wait before reinvoking "
    "automountd(8) for any given file or directory");
int autofs_retry_attempts = 3;
TUNABLE_INT("vfs.autofs.retry_attempts", &autofs_retry_attempts);
SYSCTL_INT(_vfs_autofs, OID_AUTO, retry_attempts, CTLFLAG_RWTUN,
    &autofs_retry_attempts, 3, "Number of attempts before failing mount");
int autofs_retry_delay = 1;
TUNABLE_INT("vfs.autofs.retry_delay", &autofs_retry_delay);
SYSCTL_INT(_vfs_autofs, OID_AUTO, retry_delay, CTLFLAG_RWTUN,
    &autofs_retry_delay, 1, "Number of seconds before retrying");
int autofs_interruptible = 1;
TUNABLE_INT("vfs.autofs.interruptible", &autofs_interruptible);
SYSCTL_INT(_vfs_autofs, OID_AUTO, interruptible, CTLFLAG_RWTUN,
    &autofs_interruptible, 1, "Allow requests to be interrupted by signal");

static int
autofs_node_cmp(const struct autofs_node *a, const struct autofs_node *b)
{

        return (strcmp(a->an_name, b->an_name));
}

RB_GENERATE(autofs_node_tree, autofs_node, an_link, autofs_node_cmp);

int
autofs_init(struct vfsconf *vfsp)
{
        int error;

        KASSERT(autofs_softc == NULL,
            ("softc %p, should be NULL", autofs_softc));

        autofs_softc = malloc(sizeof(*autofs_softc), M_AUTOFS,
            M_WAITOK | M_ZERO);

        autofs_request_zone = uma_zcreate("autofs_request",
            sizeof(struct autofs_request), NULL, NULL, NULL, NULL,
            UMA_ALIGN_PTR, 0);
        autofs_node_zone = uma_zcreate("autofs_node",
            sizeof(struct autofs_node), NULL, NULL, NULL, NULL,
            UMA_ALIGN_PTR, 0);

        TAILQ_INIT(&autofs_softc->sc_requests);
        cv_init(&autofs_softc->sc_cv, "autofscv");
        sx_init(&autofs_softc->sc_lock, "autofslk");

        error = make_dev_p(MAKEDEV_CHECKNAME, &autofs_softc->sc_cdev,
            &autofs_cdevsw, NULL, UID_ROOT, GID_WHEEL, 0600, "autofs");
        if (error != 0) {
                AUTOFS_WARN("failed to create device node, error %d", error);
                uma_zdestroy(autofs_request_zone);
                uma_zdestroy(autofs_node_zone);
                free(autofs_softc, M_AUTOFS);

                return (error);
        }
        autofs_softc->sc_cdev->si_drv1 = autofs_softc;

        return (0);
}

int
autofs_uninit(struct vfsconf *vfsp)
{

        sx_xlock(&autofs_softc->sc_lock);
        if (autofs_softc->sc_dev_opened) {
                sx_xunlock(&autofs_softc->sc_lock);
                return (EBUSY);
        }
        if (autofs_softc->sc_cdev != NULL)
                destroy_dev(autofs_softc->sc_cdev);

        uma_zdestroy(autofs_request_zone);
        uma_zdestroy(autofs_node_zone);

        sx_xunlock(&autofs_softc->sc_lock);
        /*
         * XXX: Race with open?
         */
        free(autofs_softc, M_AUTOFS);

        return (0);
}

bool
autofs_ignore_thread(const struct thread *td)
{
        struct proc *p;

        p = td->td_proc;

        if (autofs_softc->sc_dev_opened == false)
                return (false);

        PROC_LOCK(p);
        if (p->p_session->s_sid == autofs_softc->sc_dev_sid) {
                PROC_UNLOCK(p);
                return (true);
        }
        PROC_UNLOCK(p);

        return (false);
}

static char *
autofs_path(struct autofs_node *anp)
{
        struct autofs_mount *amp;
        char *path, *tmp;

        amp = anp->an_mount;

        path = strdup("", M_AUTOFS);
        for (; anp->an_parent != NULL; anp = anp->an_parent) {
                tmp = malloc(strlen(anp->an_name) + strlen(path) + 2,
                    M_AUTOFS, M_WAITOK);
                strcpy(tmp, anp->an_name);
                strcat(tmp, "/");
                strcat(tmp, path);
                free(path, M_AUTOFS);
                path = tmp;
        }

        tmp = malloc(strlen(amp->am_mountpoint) + strlen(path) + 2,
            M_AUTOFS, M_WAITOK);
        strcpy(tmp, amp->am_mountpoint);
        strcat(tmp, "/");
        strcat(tmp, path);
        free(path, M_AUTOFS);
        path = tmp;

        return (path);
}

static void
autofs_task(void *context, int pending)
{
        struct autofs_request *ar;

        ar = context;

        sx_xlock(&autofs_softc->sc_lock);
        AUTOFS_WARN("request %d for %s timed out after %d seconds",
            ar->ar_id, ar->ar_path, autofs_timeout);
        /*
         * XXX: EIO perhaps?
         */
        ar->ar_error = ETIMEDOUT;
        ar->ar_wildcards = true;
        ar->ar_done = true;
        ar->ar_in_progress = false;
        cv_broadcast(&autofs_softc->sc_cv);
        sx_xunlock(&autofs_softc->sc_lock);
}

bool
autofs_cached(struct autofs_node *anp, const char *component, int componentlen)
{
        int error;
        struct autofs_mount *amp;

        amp = anp->an_mount;

        AUTOFS_ASSERT_UNLOCKED(amp);

        /*
         * For root node we need to request automountd(8) assistance even
         * if the node is marked as cached, but the requested top-level
         * directory does not exist.  This is necessary for wildcard indirect
         * map keys to work.  We don't do this if we know that there are
         * no wildcards.
         */
        if (anp->an_parent == NULL && componentlen != 0 && anp->an_wildcards) {
                AUTOFS_SLOCK(amp);
                error = autofs_node_find(anp, component, componentlen, NULL);
                AUTOFS_SUNLOCK(amp);
                if (error != 0)
                        return (false);
        }

        return (anp->an_cached);
}

static void
autofs_cache_callout(void *context)
{
        struct autofs_node *anp;

        anp = context;
        anp->an_cached = false;
}

void
autofs_flush(struct autofs_mount *amp)
{

        /*
         * XXX: This will do for now, but ideally we should iterate
         *      over all the nodes.
         */
        amp->am_root->an_cached = false;
        AUTOFS_DEBUG("%s flushed", amp->am_mountpoint);
}

/*
 * The set/restore sigmask functions are used to (temporarily) overwrite
 * the thread td_sigmask during triggering.
 */
static void
autofs_set_sigmask(sigset_t *oldset)
{
        sigset_t newset;
        int i;

        SIGFILLSET(newset);
        /* Remove the autofs set of signals from newset */
        PROC_LOCK(curproc);
        mtx_lock(&curproc->p_sigacts->ps_mtx);
        for (i = 0 ; i < nitems(autofs_sig_set); i++) {
                /*
                 * But make sure we leave the ones already masked
                 * by the process, i.e. remove the signal from the
                 * temporary signalmask only if it wasn't already
                 * in p_sigmask.
                 */
                if (!SIGISMEMBER(curthread->td_sigmask, autofs_sig_set[i]) &&
                    !SIGISMEMBER(curproc->p_sigacts->ps_sigignore,
                    autofs_sig_set[i])) {
                        SIGDELSET(newset, autofs_sig_set[i]);
                }
        }
        mtx_unlock(&curproc->p_sigacts->ps_mtx);
        kern_sigprocmask(curthread, SIG_SETMASK, &newset, oldset,
            SIGPROCMASK_PROC_LOCKED);
        PROC_UNLOCK(curproc);
}

static void
autofs_restore_sigmask(sigset_t *set)
{

        kern_sigprocmask(curthread, SIG_SETMASK, set, NULL, 0);
}

static int
autofs_trigger_one(struct autofs_node *anp,
    const char *component, int componentlen)
{
        sigset_t oldset;
        struct autofs_mount *amp;
        struct autofs_node *firstanp;
        struct autofs_request *ar;
        char *key, *path;
        int error = 0, request_error, last;
        bool wildcards;

        amp = anp->an_mount;

        sx_assert(&autofs_softc->sc_lock, SA_XLOCKED);

        if (anp->an_parent == NULL) {
                key = strndup(component, componentlen, M_AUTOFS);
        } else {
                for (firstanp = anp; firstanp->an_parent->an_parent != NULL;
                    firstanp = firstanp->an_parent)
                        continue;
                key = strdup(firstanp->an_name, M_AUTOFS);
        }

        path = autofs_path(anp);

        TAILQ_FOREACH(ar, &autofs_softc->sc_requests, ar_next) {
                if (strcmp(ar->ar_path, path) != 0)
                        continue;
                if (strcmp(ar->ar_key, key) != 0)
                        continue;

                KASSERT(strcmp(ar->ar_from, amp->am_from) == 0,
                    ("from changed; %s != %s", ar->ar_from, amp->am_from));
                KASSERT(strcmp(ar->ar_prefix, amp->am_prefix) == 0,
                    ("prefix changed; %s != %s",
                     ar->ar_prefix, amp->am_prefix));
                KASSERT(strcmp(ar->ar_options, amp->am_options) == 0,
                    ("options changed; %s != %s",
                     ar->ar_options, amp->am_options));

                break;
        }

        if (ar != NULL) {
                refcount_acquire(&ar->ar_refcount);
        } else {
                ar = uma_zalloc(autofs_request_zone, M_WAITOK | M_ZERO);
                ar->ar_mount = amp;

                ar->ar_id =
                    atomic_fetchadd_int(&autofs_softc->sc_last_request_id, 1);
                strlcpy(ar->ar_from, amp->am_from, sizeof(ar->ar_from));
                strlcpy(ar->ar_path, path, sizeof(ar->ar_path));
                strlcpy(ar->ar_prefix, amp->am_prefix, sizeof(ar->ar_prefix));
                strlcpy(ar->ar_key, key, sizeof(ar->ar_key));
                strlcpy(ar->ar_options,
                    amp->am_options, sizeof(ar->ar_options));

                TIMEOUT_TASK_INIT(taskqueue_thread, &ar->ar_task, 0,
                    autofs_task, ar);
                taskqueue_enqueue_timeout(taskqueue_thread, &ar->ar_task,
                    autofs_timeout * hz);
                refcount_init(&ar->ar_refcount, 1);
                TAILQ_INSERT_TAIL(&autofs_softc->sc_requests, ar, ar_next);
        }

        cv_broadcast(&autofs_softc->sc_cv);
        while (ar->ar_done == false) {
                if (autofs_interruptible != 0) {
                        autofs_set_sigmask(&oldset);
                        error = cv_wait_sig(&autofs_softc->sc_cv,
                            &autofs_softc->sc_lock);
                        autofs_restore_sigmask(&oldset);
                        if (error != 0) {
                                AUTOFS_WARN("cv_wait_sig for %s failed "
                                    "with error %d", ar->ar_path, error);
                                break;
                        }
                } else {
                        cv_wait(&autofs_softc->sc_cv, &autofs_softc->sc_lock);
                }
        }

        request_error = ar->ar_error;
        if (request_error != 0) {
                AUTOFS_WARN("request for %s completed with error %d, "
                    "pid %d (%s)", ar->ar_path, request_error,
                    curproc->p_pid, curproc->p_comm);
        }

        wildcards = ar->ar_wildcards;

        last = refcount_release(&ar->ar_refcount);
        if (last) {
                TAILQ_REMOVE(&autofs_softc->sc_requests, ar, ar_next);
                /*
                 * Unlock the sc_lock, so that autofs_task() can complete.
                 */
                sx_xunlock(&autofs_softc->sc_lock);
                taskqueue_cancel_timeout(taskqueue_thread, &ar->ar_task, NULL);
                taskqueue_drain_timeout(taskqueue_thread, &ar->ar_task);
                uma_zfree(autofs_request_zone, ar);
                sx_xlock(&autofs_softc->sc_lock);
        }

        /*
         * Note that we do not do negative caching on purpose.  This
         * way the user can retry access at any time, e.g. after fixing
         * the failure reason, without waiting for cache timer to expire.
         */
        if (error == 0 && request_error == 0 && autofs_cache > 0) {
                anp->an_cached = true;
                anp->an_wildcards = wildcards;
                callout_reset(&anp->an_callout, autofs_cache * hz,
                    autofs_cache_callout, anp);
        }

        free(key, M_AUTOFS);
        free(path, M_AUTOFS);

        if (error != 0)
                return (error);
        return (request_error);
}

/*
 * Send request to automountd(8) and wait for completion.
 */
int
autofs_trigger(struct autofs_node *anp,
    const char *component, int componentlen)
{
        int error;

        for (;;) {
                error = autofs_trigger_one(anp, component, componentlen);
                if (error == 0) {
                        anp->an_retries = 0;
                        return (0);
                }
                if (error == EINTR || error == ERESTART) {
                        AUTOFS_DEBUG("trigger interrupted by signal, "
                            "not retrying");
                        anp->an_retries = 0;
                        return (error);
                }
                anp->an_retries++;
                if (anp->an_retries >= autofs_retry_attempts) {
                        AUTOFS_DEBUG("trigger failed %d times; returning "
                            "error %d", anp->an_retries, error);
                        anp->an_retries = 0;
                        return (error);
                }
                AUTOFS_DEBUG("trigger failed with error %d; will retry in "
                    "%d seconds, %d attempts left", error, autofs_retry_delay,
                    autofs_retry_attempts - anp->an_retries);
                sx_xunlock(&autofs_softc->sc_lock);
                pause("autofs_retry", autofs_retry_delay * hz);
                sx_xlock(&autofs_softc->sc_lock);
        }
}

static int
autofs_ioctl_request(struct autofs_daemon_request *adr)
{
        struct autofs_request *ar;
        int error;

        sx_xlock(&autofs_softc->sc_lock);
        for (;;) {
                TAILQ_FOREACH(ar, &autofs_softc->sc_requests, ar_next) {
                        if (ar->ar_done)
                                continue;
                        if (ar->ar_in_progress)
                                continue;

                        break;
                }

                if (ar != NULL)
                        break;

                error = cv_wait_sig(&autofs_softc->sc_cv,
                    &autofs_softc->sc_lock);
                if (error != 0) {
                        sx_xunlock(&autofs_softc->sc_lock);
                        return (error);
                }
        }

        ar->ar_in_progress = true;
        sx_xunlock(&autofs_softc->sc_lock);

        adr->adr_id = ar->ar_id;
        strlcpy(adr->adr_from, ar->ar_from, sizeof(adr->adr_from));
        strlcpy(adr->adr_path, ar->ar_path, sizeof(adr->adr_path));
        strlcpy(adr->adr_prefix, ar->ar_prefix, sizeof(adr->adr_prefix));
        strlcpy(adr->adr_key, ar->ar_key, sizeof(adr->adr_key));
        strlcpy(adr->adr_options, ar->ar_options, sizeof(adr->adr_options));

        PROC_LOCK(curproc);
        autofs_softc->sc_dev_sid = curproc->p_session->s_sid;
        PROC_UNLOCK(curproc);

        return (0);
}

static int
autofs_ioctl_done_101(struct autofs_daemon_done_101 *add)
{
        struct autofs_request *ar;

        sx_xlock(&autofs_softc->sc_lock);
        TAILQ_FOREACH(ar, &autofs_softc->sc_requests, ar_next) {
                if (ar->ar_id == add->add_id)
                        break;
        }

        if (ar == NULL) {
                sx_xunlock(&autofs_softc->sc_lock);
                AUTOFS_DEBUG("id %d not found", add->add_id);
                return (ESRCH);
        }

        ar->ar_error = add->add_error;
        ar->ar_wildcards = true;
        ar->ar_done = true;
        ar->ar_in_progress = false;
        cv_broadcast(&autofs_softc->sc_cv);

        sx_xunlock(&autofs_softc->sc_lock);

        return (0);
}

static int
autofs_ioctl_done(struct autofs_daemon_done *add)
{
        struct autofs_request *ar;

        sx_xlock(&autofs_softc->sc_lock);
        TAILQ_FOREACH(ar, &autofs_softc->sc_requests, ar_next) {
                if (ar->ar_id == add->add_id)
                        break;
        }

        if (ar == NULL) {
                sx_xunlock(&autofs_softc->sc_lock);
                AUTOFS_DEBUG("id %d not found", add->add_id);
                return (ESRCH);
        }

        ar->ar_error = add->add_error;
        ar->ar_wildcards = add->add_wildcards;
        ar->ar_done = true;
        ar->ar_in_progress = false;
        cv_broadcast(&autofs_softc->sc_cv);

        sx_xunlock(&autofs_softc->sc_lock);

        return (0);
}

static int
autofs_open(struct cdev *dev, int flags, int fmt, struct thread *td)
{

        sx_xlock(&autofs_softc->sc_lock);
        /*
         * We must never block automountd(8) and its descendants, and we use
         * session ID to determine that: we store session id of the process
         * that opened the device, and then compare it with session ids
         * of triggering processes.  This means running a second automountd(8)
         * instance would break the previous one.  The check below prevents
         * it from happening.
         */
        if (autofs_softc->sc_dev_opened) {
                sx_xunlock(&autofs_softc->sc_lock);
                return (EBUSY);
        }

        autofs_softc->sc_dev_opened = true;
        sx_xunlock(&autofs_softc->sc_lock);

        return (0);
}

static int
autofs_close(struct cdev *dev, int flag, int fmt, struct thread *td)
{

        sx_xlock(&autofs_softc->sc_lock);
        KASSERT(autofs_softc->sc_dev_opened, ("not opened?"));
        autofs_softc->sc_dev_opened = false;
        sx_xunlock(&autofs_softc->sc_lock);

        return (0);
}

static int
autofs_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, int mode,
    struct thread *td)
{

        KASSERT(autofs_softc->sc_dev_opened, ("not opened?"));

        switch (cmd) {
        case AUTOFSREQUEST:
                return (autofs_ioctl_request(
                    (struct autofs_daemon_request *)arg));
        case AUTOFSDONE101:
                return (autofs_ioctl_done_101(
                    (struct autofs_daemon_done_101 *)arg));
        case AUTOFSDONE:
                return (autofs_ioctl_done(
                    (struct autofs_daemon_done *)arg));
        default:
                AUTOFS_DEBUG("invalid cmd %lx", cmd);
                return (EINVAL);
        }
}