/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2010 Alexander Motin <mav@FreeBSD.org>
 * 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 AUTHORS 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 AUTHORS 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/kernel.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/bio.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <sys/bitstring.h>
#include <vm/uma.h>
#include <machine/atomic.h>
#include <geom/geom.h>
#include <sys/proc.h>
#include <sys/kthread.h>
#include <geom/raid/g_raid.h>
#include "g_raid_md_if.h"

static struct g_raid_softc *
g_raid_find_node(struct g_class *mp, const char *name)
{
        struct g_raid_softc *sc;
        struct g_geom *gp;
        struct g_provider *pp;
        struct g_raid_volume *vol;

        /* Look for geom with specified name. */
        LIST_FOREACH(gp, &mp->geom, geom) {
                sc = gp->softc;
                if (sc == NULL)
                        continue;
                if (sc->sc_stopping != 0)
                        continue;
                if (strcasecmp(sc->sc_name, name) == 0)
                        return (sc);
        }

        /* Look for provider with specified name. */
        LIST_FOREACH(gp, &mp->geom, geom) {
                sc = gp->softc;
                if (sc == NULL)
                        continue;
                if (sc->sc_stopping != 0)
                        continue;
                LIST_FOREACH(pp, &gp->provider, provider) {
                        if (strcmp(pp->name, name) == 0)
                                return (sc);
                        if (strncmp(pp->name, "raid/", 5) == 0 &&
                            strcmp(pp->name + 5, name) == 0)
                                return (sc);
                }
        }

        /* Look for volume with specified name. */
        LIST_FOREACH(gp, &mp->geom, geom) {
                sc = gp->softc;
                if (sc == NULL)
                        continue;
                if (sc->sc_stopping != 0)
                        continue;
                TAILQ_FOREACH(vol, &sc->sc_volumes, v_next) {
                        if (strcmp(vol->v_name, name) == 0)
                                return (sc);
                }
        }
        return (NULL);
}

static void
g_raid_ctl_label(struct gctl_req *req, struct g_class *mp)
{
        struct g_geom *geom;
        struct g_raid_softc *sc;
        const char *format;
        int *nargs;
        int crstatus, ctlstatus;
        char buf[64];

        nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
        if (nargs == NULL) {
                gctl_error(req, "No '%s' argument.", "nargs");
                return;
        }
        if (*nargs < 4) {
                gctl_error(req, "Invalid number of arguments.");
                return;
        }
        format = gctl_get_asciiparam(req, "arg0");
        if (format == NULL) {
                gctl_error(req, "No format received.");
                return;
        }
        crstatus = g_raid_create_node_format(format, req, &geom);
        if (crstatus == G_RAID_MD_TASTE_FAIL) {
                gctl_error(req, "Failed to create array with format '%s'.",
                    format);
                return;
        }
        sc = (struct g_raid_softc *)geom->softc;
        g_topology_unlock();
        sx_xlock(&sc->sc_lock);
        ctlstatus = G_RAID_MD_CTL(sc->sc_md, req);
        if (ctlstatus < 0) {
                gctl_error(req, "Command failed: %d.", ctlstatus);
                if (crstatus == G_RAID_MD_TASTE_NEW)
                        g_raid_destroy_node(sc, 0);
        } else {
                if (crstatus == G_RAID_MD_TASTE_NEW)
                        snprintf(buf, sizeof(buf), "%s created\n", sc->sc_name);
                else
                        snprintf(buf, sizeof(buf), "%s reused\n", sc->sc_name);
                gctl_set_param_err(req, "output", buf, strlen(buf) + 1);
        }
        sx_xunlock(&sc->sc_lock);
        g_topology_lock();
}

static void
g_raid_ctl_stop(struct gctl_req *req, struct g_class *mp)
{
        struct g_raid_softc *sc;
        const char *nodename;
        int *nargs, *force;
        int error, how;

        nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
        if (nargs == NULL) {
                gctl_error(req, "No '%s' argument.", "nargs");
                return;
        }
        if (*nargs != 1) {
                gctl_error(req, "Invalid number of arguments.");
                return;
        }
        nodename = gctl_get_asciiparam(req, "arg0");
        if (nodename == NULL) {
                gctl_error(req, "No array name received.");
                return;
        }
        sc = g_raid_find_node(mp, nodename);
        if (sc == NULL) {
                gctl_error(req, "Array '%s' not found.", nodename);
                return;
        }
        force = gctl_get_paraml(req, "force", sizeof(*force));
        if (force != NULL && *force)
                how = G_RAID_DESTROY_HARD;
        else
                how = G_RAID_DESTROY_SOFT;
        g_topology_unlock();
        sx_xlock(&sc->sc_lock);
        error = g_raid_destroy(sc, how);
        if (error != 0)
                gctl_error(req, "Array is busy.");
        g_topology_lock();
}

static void
g_raid_ctl_other(struct gctl_req *req, struct g_class *mp)
{
        struct g_raid_softc *sc;
        const char *nodename;
        int *nargs;
        int ctlstatus;

        nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
        if (nargs == NULL) {
                gctl_error(req, "No '%s' argument.", "nargs");
                return;
        }
        if (*nargs < 1) {
                gctl_error(req, "Invalid number of arguments.");
                return;
        }
        nodename = gctl_get_asciiparam(req, "arg0");
        if (nodename == NULL) {
                gctl_error(req, "No array name received.");
                return;
        }
        sc = g_raid_find_node(mp, nodename);
        if (sc == NULL) {
                gctl_error(req, "Array '%s' not found.", nodename);
                return;
        }
        g_topology_unlock();
        sx_xlock(&sc->sc_lock);
        if (sc->sc_md != NULL) {
                ctlstatus = G_RAID_MD_CTL(sc->sc_md, req);
                if (ctlstatus < 0)
                        gctl_error(req, "Command failed: %d.", ctlstatus);
        }
        sx_xunlock(&sc->sc_lock);
        g_topology_lock();
}

void
g_raid_ctl(struct gctl_req *req, struct g_class *mp, const char *verb)
{
        uint32_t *version;

        g_topology_assert();

        version = gctl_get_paraml(req, "version", sizeof(*version));
        if (version == NULL) {
                gctl_error(req, "No '%s' argument.", "version");
                return;
        }
        if (*version != G_RAID_VERSION) {
                gctl_error(req, "Userland and kernel parts are out of sync.");
                return;
        }

        if (strcmp(verb, "label") == 0)
                g_raid_ctl_label(req, mp);
        else if (strcmp(verb, "stop") == 0)
                g_raid_ctl_stop(req, mp);
        else
                g_raid_ctl_other(req, mp);
}