/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@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 <errno.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <strings.h>
#include <assert.h>
#include <libgeom.h>
#include <geom/stripe/g_stripe.h>

#include "core/geom.h"
#include "misc/subr.h"


uint32_t lib_version = G_LIB_VERSION;
uint32_t version = G_STRIPE_VERSION;

#define GSTRIPE_STRIPESIZE      "65536"

static void stripe_main(struct gctl_req *req, unsigned flags);
static void stripe_clear(struct gctl_req *req);
static void stripe_dump(struct gctl_req *req);
static void stripe_label(struct gctl_req *req);

struct g_command class_commands[] = {
        { "clear", G_FLAG_VERBOSE, stripe_main, G_NULL_OPTS,
            "[-v] prov ..."
        },
        { "create", G_FLAG_VERBOSE | G_FLAG_LOADKLD, NULL,
            {
                { 's', "stripesize", GSTRIPE_STRIPESIZE, G_TYPE_NUMBER },
                G_OPT_SENTINEL
            },
            "[-v] [-s stripesize] name prov prov ..."
        },
        { "destroy", G_FLAG_VERBOSE, NULL,
            {
                { 'f', "force", NULL, G_TYPE_BOOL },
                G_OPT_SENTINEL
            },
            "[-fv] name ..."
        },
        { "dump", 0, stripe_main, G_NULL_OPTS,
            "prov ..."
        },
        { "label", G_FLAG_VERBOSE | G_FLAG_LOADKLD, stripe_main,
            {
                { 'h', "hardcode", NULL, G_TYPE_BOOL },
                { 's', "stripesize", GSTRIPE_STRIPESIZE, G_TYPE_NUMBER },
                G_OPT_SENTINEL
            },
            "[-hv] [-s stripesize] name prov prov ..."
        },
        { "stop", G_FLAG_VERBOSE, NULL,
            {
                { 'f', "force", NULL, G_TYPE_BOOL },
                G_OPT_SENTINEL
            },
            "[-fv] name ..."
        },
        G_CMD_SENTINEL
};

static int verbose = 0;

static void
stripe_main(struct gctl_req *req, unsigned flags)
{
        const char *name;

        if ((flags & G_FLAG_VERBOSE) != 0)
                verbose = 1;

        name = gctl_get_ascii(req, "verb");
        if (name == NULL) {
                gctl_error(req, "No '%s' argument.", "verb");
                return;
        }
        if (strcmp(name, "label") == 0)
                stripe_label(req);
        else if (strcmp(name, "clear") == 0)
                stripe_clear(req);
        else if (strcmp(name, "dump") == 0)
                stripe_dump(req);
        else
                gctl_error(req, "Unknown command: %s.", name);
}

static void
stripe_label(struct gctl_req *req)
{
        struct g_stripe_metadata md;
        intmax_t stripesize;
        off_t compsize, msize;
        u_char sector[512];
        unsigned ssize, secsize;
        const char *name;
        int error, i, nargs, hardcode;

        bzero(sector, sizeof(sector));
        nargs = gctl_get_int(req, "nargs");
        if (nargs < 3) {
                gctl_error(req, "Too few arguments.");
                return;
        }
        hardcode = gctl_get_int(req, "hardcode");

        /*
         * Clear last sector first to spoil all components if device exists.
         */
        compsize = 0;
        secsize = 0;
        for (i = 1; i < nargs; i++) {
                name = gctl_get_ascii(req, "arg%d", i);
                msize = g_get_mediasize(name);
                ssize = g_get_sectorsize(name);
                if (msize == 0 || ssize == 0) {
                        gctl_error(req, "Can't get informations about %s: %s.",
                            name, strerror(errno));
                        return;
                }
                msize -= ssize;
                if (compsize == 0 || (compsize > 0 && msize < compsize))
                        compsize = msize;
                if (secsize == 0)
                        secsize = ssize;
                else
                        secsize = g_lcm(secsize, ssize);

                error = g_metadata_clear(name, NULL);
                if (error != 0) {
                        gctl_error(req, "Can't store metadata on %s: %s.", name,
                            strerror(error));
                        return;
                }
        }

        strlcpy(md.md_magic, G_STRIPE_MAGIC, sizeof(md.md_magic));
        md.md_version = G_STRIPE_VERSION;
        name = gctl_get_ascii(req, "arg0");
        strlcpy(md.md_name, name, sizeof(md.md_name));
        md.md_id = arc4random();
        md.md_all = nargs - 1;
        stripesize = gctl_get_intmax(req, "stripesize");
        if ((stripesize % secsize) != 0) {
                gctl_error(req, "Stripesize should be multiple of %u.",
                    secsize);
                return;
        }
        md.md_stripesize = stripesize;

        /*
         * Ok, store metadata.
         */
        for (i = 1; i < nargs; i++) {
                name = gctl_get_ascii(req, "arg%d", i);
                msize = g_get_mediasize(name);
                ssize = g_get_sectorsize(name);
                if (compsize < msize - ssize) {
                        fprintf(stderr,
                            "warning: %s: only %jd bytes from %jd bytes used.\n",
                            name, (intmax_t)compsize, (intmax_t)(msize - ssize));
                }

                md.md_no = i - 1;
                md.md_provsize = msize;
                if (!hardcode)
                        bzero(md.md_provider, sizeof(md.md_provider));
                else {
                        if (strncmp(name, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
                                name += sizeof(_PATH_DEV) - 1;
                        strlcpy(md.md_provider, name, sizeof(md.md_provider));
                }
                stripe_metadata_encode(&md, sector);
                error = g_metadata_store(name, sector, sizeof(sector));
                if (error != 0) {
                        fprintf(stderr, "Can't store metadata on %s: %s.\n",
                            name, strerror(error));
                        gctl_error(req, "Not fully done.");
                        continue;
                }
                if (verbose)
                        printf("Metadata value stored on %s.\n", name);
        }
}

static void
stripe_clear(struct gctl_req *req)
{
        const char *name;
        int error, i, nargs;

        nargs = gctl_get_int(req, "nargs");
        if (nargs < 1) {
                gctl_error(req, "Too few arguments.");
                return;
        }

        for (i = 0; i < nargs; i++) {
                name = gctl_get_ascii(req, "arg%d", i);
                error = g_metadata_clear(name, G_STRIPE_MAGIC);
                if (error != 0) {
                        fprintf(stderr, "Can't clear metadata on %s: %s.\n",
                            name, strerror(error));
                        gctl_error(req, "Not fully done.");
                        continue;
                }
                if (verbose)
                        printf("Metadata cleared on %s.\n", name);
        }
}

static void
stripe_metadata_dump(const struct g_stripe_metadata *md)
{

        printf("         Magic string: %s\n", md->md_magic);
        printf("     Metadata version: %u\n", (u_int)md->md_version);
        printf("          Device name: %s\n", md->md_name);
        printf("            Device ID: %u\n", (u_int)md->md_id);
        printf("          Disk number: %u\n", (u_int)md->md_no);
        printf("Total number of disks: %u\n", (u_int)md->md_all);
        printf("          Stripe size: %u\n", (u_int)md->md_stripesize);
        printf("   Hardcoded provider: %s\n", md->md_provider);
}

static void
stripe_dump(struct gctl_req *req)
{
        struct g_stripe_metadata md, tmpmd;
        const char *name;
        int error, i, nargs;

        nargs = gctl_get_int(req, "nargs");
        if (nargs < 1) {
                gctl_error(req, "Too few arguments.");
                return;
        }

        for (i = 0; i < nargs; i++) {
                name = gctl_get_ascii(req, "arg%d", i);
                error = g_metadata_read(name, (u_char *)&tmpmd, sizeof(tmpmd),
                    G_STRIPE_MAGIC);
                if (error != 0) {
                        fprintf(stderr, "Can't read metadata from %s: %s.\n",
                            name, strerror(error));
                        gctl_error(req, "Not fully done.");
                        continue;
                }
                stripe_metadata_decode((u_char *)&tmpmd, &md);
                printf("Metadata on %s:\n", name);
                stripe_metadata_dump(&md);
                printf("\n");
        }
}