/*-
 * Copyright (c) 2002 Marcel Moolenaar
 * 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 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.
 */

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/cdefs.h>
#ifdef __FBSDID
__FBSDID("$FreeBSD: src/sbin/gpt/add.c,v 1.14 2006/06/22 22:05:28 marcel Exp $");
#endif
#ifdef __RCSID
__RCSID("$NetBSD: resizedisk.c,v 1.23 2025/12/17 15:56:06 nia Exp $");
#endif

#include <sys/bootblock.h>
#include <sys/types.h>
#if defined(HAVE_SYS_ENDIAN_H) || ! defined(HAVE_NBTOOL_CONFIG_H)
#include <sys/endian.h>
#endif

#include <err.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "map.h"
#include "gpt.h"
#include "gpt_private.h"


static int cmd_resizedisk(gpt_t, int, char *[]);

static const char *resizediskhelp[] = {
        "[-s size] [-q]",
};

const struct gpt_cmd c_resizedisk = {
        "resizedisk",
        cmd_resizedisk,
        resizediskhelp, __arraycount(resizediskhelp),
        GPT_OPTGPT,
};

#define usage() gpt_usage(NULL, &c_resizedisk)

/*
 * relocate the secondary GPT based on the following criteria:
 * - size not specified
 *   - disk has not changed size, do nothing
 *   - disk has grown, relocate secondary
 *   - disk has shrunk, create new secondary
 * - size specified
 *   - size is larger then disk or same as current location, do nothing
 *   - relocate or create new secondary
 * - when shrinking, verify that table fits
 */
static int 
resizedisk(gpt_t gpt, off_t sector, off_t size __unused, bool quiet)
{
        map_t mbrmap;
        struct gpt_hdr *hdr;
        struct gpt_ent *ent;
        struct mbr *mbr;
        off_t last, oldloc, newloc, lastdata, gpt_size;
        int i;
        
        last = gpt->mediasz / gpt->secsz - 1;
        lastdata = 0;
        newloc = 0;

        if (sector > last) {
                gpt_warnx(gpt, "specified number of sectors %jd"
                    " is larger then the disk %jd", (uintmax_t)sector,
                    (uintmax_t)last);
                return -1;
        }

        mbrmap = map_find(gpt, MAP_TYPE_PMBR);
        if (mbrmap == NULL || mbrmap->map_start != 0) {
                gpt_warnx(gpt, "No valid PMBR found");
                return -1;
        }
        mbr = mbrmap->map_data;

        gpt->gpt = map_find(gpt, MAP_TYPE_PRI_GPT_HDR);
        if (gpt->gpt == NULL) {
                gpt_warnx(gpt, "No primary GPT header; run create or recover");
                return -1;
        }

        gpt->tbl = map_find(gpt, MAP_TYPE_PRI_GPT_TBL);
        if (gpt->tbl == NULL) {
                gpt_warnx(gpt, "No primary GPT table; Run recover");
                return -1;
        }

        hdr = gpt->gpt->map_data;
        oldloc = (off_t)le64toh((uint64_t)hdr->hdr_lba_alt);

        gpt->tpg = map_find(gpt, MAP_TYPE_SEC_GPT_HDR);
        gpt->lbt = map_find(gpt, MAP_TYPE_SEC_GPT_TBL);

        if (gpt->tpg == NULL || gpt->lbt == NULL)
                gpt_warnx(gpt, "No secondary GPT table");

        gpt_size = gpt->tbl->map_size;
        if (sector == oldloc) {
                if (!quiet)
                        gpt_warnx(gpt, "Device is already the specified size");
                return 0;
        }

        if (sector == 0 && last == oldloc) {
                if (!quiet)
                        gpt_warnx(gpt, "Device hasn't changed size");
                if (gpt->tpg != NULL && gpt->lbt != NULL)
                        return 0;
        }

        for (ent = gpt->tbl->map_data; ent <
            (struct gpt_ent *)((char *)gpt->tbl->map_data +
            le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz)); ent++) {
                if (!gpt_uuid_is_nil(ent->ent_type) &&
                    ((off_t)le64toh(ent->ent_lba_end) > lastdata)) {
                        lastdata = (off_t)le64toh((uint64_t)ent->ent_lba_end);
                }
        }

        if (sector - gpt_size <= lastdata) {
                gpt_warnx(gpt, "Not enough space at %" PRIu64
                    " for secondary GPT table", sector);
                return -1;
        }

        if (last - gpt_size <= lastdata) {
                gpt_warnx(gpt, "Not enough space for new secondary GPT table");
                return -1;
        }

        if (sector > oldloc)
                newloc = sector;
        if (sector > 0 && sector < oldloc && last >= oldloc)
                newloc = sector;
        if (sector == 0 && last > oldloc)
                newloc = last;

        if (newloc > 0 && gpt->tpg != NULL && gpt->lbt != NULL) {
                if (!quiet)
                        gpt_msg(gpt, "Moving secondary GPT header");
                gpt->tpg->map_start = newloc;
                gpt->lbt->map_start = newloc - gpt_size;
        } else {
                if (!quiet)
                        gpt_msg(gpt, "Creating new secondary GPT header");
                if (sector > 0)
                        newloc = sector;
                else
                        newloc = last;

                if (gpt_add_hdr(gpt, MAP_TYPE_SEC_GPT_HDR, newloc) == -1)
                        return -1;

                gpt->lbt = map_add(gpt, newloc - gpt_size, gpt_size,
                    MAP_TYPE_SEC_GPT_TBL, gpt->tbl->map_data, 0);
                if (gpt->lbt == NULL) {
                        gpt_warn(gpt, "Error adding secondary GPT table");
                        return -1;
                }
                memcpy(gpt->tpg->map_data, gpt->gpt->map_data, gpt->secsz);
        }

        hdr = gpt->gpt->map_data;
        hdr->hdr_lba_alt = htole64((uint64_t)gpt->tpg->map_start);
        hdr->hdr_crc_self = 0;
        hdr->hdr_lba_end = htole64((uint64_t)(gpt->lbt->map_start - 1));
        hdr->hdr_crc_self =
            htole32(crc32(gpt->gpt->map_data, GPT_HDR_SIZE));
        gpt_write(gpt, gpt->gpt);

        hdr = gpt->tpg->map_data;
        hdr->hdr_lba_self = htole64((uint64_t)gpt->tpg->map_start);
        hdr->hdr_lba_alt = htole64((uint64_t)gpt->gpt->map_start);
        hdr->hdr_lba_end = htole64((uint64_t)(gpt->lbt->map_start - 1));
        hdr->hdr_lba_table = htole64((uint64_t)gpt->lbt->map_start);

        if (gpt_write_backup(gpt) == -1)
                return -1;

        for (i = 0; i < 4; i++)
                if (mbr->mbr_part[0].part_typ == MBR_PTYPE_PMBR)
                        break;
        if (i == 4) {
                gpt_warnx(gpt, "No valid PMBR partition found");
                return -1;
        }
        if (last > 0xffffffff) {
                mbr->mbr_part[0].part_size_lo = htole16(0xffff);
                mbr->mbr_part[0].part_size_hi = htole16(0xffff);
        } else {
                mbr->mbr_part[0].part_size_lo = htole16((uint16_t)last);
                mbr->mbr_part[0].part_size_hi = htole16((uint16_t)((uint64_t)last >> 16));
        }
        if (gpt_write(gpt, mbrmap) == -1) {
                gpt_warnx(gpt, "Error writing PMBR");
                return -1;
        }

        return 0;
}

static int
cmd_resizedisk(gpt_t gpt, int argc, char *argv[])
{
        int ch;
        off_t sector, size = gpt->mediasz;
        bool quiet = false;

        while ((ch = getopt(argc, argv, "s:q")) != -1) {
                switch(ch) {
                case 's':
                        if (gpt_add_ais(gpt, NULL, NULL, &size, ch) == -1)
                                return -1;
                        break;
                case 'q':
                        quiet = true;
                        break;
                default:
                        return usage();
                }
        }

        if (argc != optind)
                return usage();

        if ((sector = gpt_check_ais(gpt, 0, (u_int)~0, size)) == -1)
                return -1;

        if (--sector == 0) {
                gpt_warnx(gpt, "New size %ju too small", (uintmax_t)size);
                return -1;
        }

        return resizedisk(gpt, sector, size, quiet);
}