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/* $NetBSD: partitions.c,v 1.13 2021/09/11 20:28:06 andvar Exp $ */
/*
* Copyright (c) 2020 The NetBSD Foundation, Inc.
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 "defs.h"
#include "mbr.h"
#include <assert.h>
/*
* A list of partitioning schemes, so we can iterate over everything
* supported (e.g. when partitioning a new disk). NULL terminated.
*/
const struct disk_partitioning_scheme **available_part_schemes;
/*
* The number of valid entries on above list
*/
size_t num_available_part_schemes;
extern const struct disk_partitioning_scheme disklabel_parts;
/*
* Generic reader - query a disk device and read all partitions from it.
* disk_size is in units of physical sector size, which is passe as
* bytes_per_sec.
*/
struct disk_partitions *
partitions_read_disk(const char *dev, daddr_t disk_size, size_t bytes_per_sec,
bool no_mbr)
{
const struct disk_partitioning_scheme **ps;
#ifdef HAVE_MBR
bool mbr_done = false, disklabel_done = false;
#endif
if (!available_part_schemes)
return NULL;
for (ps = available_part_schemes; *ps; ps++) {
#ifdef HAVE_MBR
if (!no_mbr && (*ps) == &disklabel_parts && !mbr_done)
continue;
if (no_mbr && (*ps)->name == MSG_parttype_mbr)
continue;
if ((*ps)->name == MSG_parttype_mbr)
mbr_done = true;
if ((*ps)->read_from_disk == disklabel_parts.read_from_disk)
disklabel_done = true;
#endif
struct disk_partitions *parts =
(*ps)->read_from_disk(dev, 0, disk_size, bytes_per_sec,
*ps);
if (parts)
return parts;
}
#ifdef HAVE_MBR
if (!disklabel_done)
return disklabel_parts.read_from_disk(dev, 0, disk_size,
bytes_per_sec, &disklabel_parts);
#endif
return NULL;
}
bool
generic_adapt_foreign_part_info(const struct disk_partitions *myself,
struct disk_part_info *dest,
const struct disk_partitioning_scheme *src_scheme,
const struct disk_part_info *src)
{
*dest = *src;
if (myself->pscheme == src_scheme)
return true; /* no conversion needed */
if (src->nat_type == NULL)
return false;
/* slightly simplistic, enhance when needed */
dest->nat_type = myself->pscheme->get_fs_part_type(
dest->nat_type ? dest->nat_type->generic_ptype : PT_root,
dest->fs_type,
dest->fs_sub_type);
if (dest->nat_type == NULL)
dest->nat_type = myself->pscheme->get_generic_part_type(
src->nat_type->generic_ptype);
if (dest->nat_type == NULL)
dest->nat_type = myself->pscheme->create_unknown_part_type();
if (dest->nat_type == NULL)
dest->nat_type = myself->pscheme->get_generic_part_type(
PT_unknown);
return true;
}
/*************** global init ****************************************/
/*
* Helper structure to fill our global list of available partitioning
* schemes.
*/
struct part_scheme_desc {
bool (*is_available)(void);
const struct disk_partitioning_scheme *ps;
};
#ifdef HAVE_GPT
bool gpt_parts_check(void);
extern const struct disk_partitioning_scheme gpt_parts;
#endif
#ifdef HAVE_MBR
extern const struct disk_partitioning_scheme mbr_parts;
#endif
#if RAW_PART == 3
static struct disk_partitioning_scheme only_disklabel_parts;
/*
* If not overridden by MD code, we can not boot from plain
* disklabel disks (w/o MBR).
*/
static bool have_only_disklabel_boot_support(const char *disk)
{
#ifdef HAVE_PLAIN_DISKLABEL_BOOT
return HAVE_PLAIN_DISKLABEL_BOOT(disk);
#else
return false;
#endif
}
#endif
/*
* One time initialization
*/
void
partitions_init(void)
{
/*
* List of partitioning schemes.
* Order is important, the selection menu is created from start
* to end. Keep good defaults early. Most architectures will
* only offer very few entries.
*/
static const struct part_scheme_desc all_descs[] = {
#if RAW_PART != 3 /* only available as primary on some architectures */
{ NULL, &disklabel_parts },
#endif
#ifdef HAVE_GPT
{ gpt_parts_check, &gpt_parts },
#endif
#ifdef HAVE_MBR
{ NULL, &mbr_parts },
#endif
#if RAW_PART == 3 /* "whole disk NetBSD" disklabel variant */
{ NULL, &only_disklabel_parts },
#endif
};
size_t i, avail;
const struct disk_partitioning_scheme **out;
bool *is_available;
static const size_t all_cnt = __arraycount(all_descs);
check_available_binaries();
#if RAW_PART == 3
/* generate a variant of disklabel w/o parent scheme */
only_disklabel_parts = disklabel_parts;
only_disklabel_parts.name = MSG_parttype_only_disklabel;
only_disklabel_parts.have_boot_support =
have_only_disklabel_boot_support;
#endif
is_available = malloc(all_cnt);
for (avail = i = 0; i < all_cnt; i++) {
is_available[i] = all_descs[i].is_available == NULL
|| all_descs[i].is_available();
if (is_available[i])
avail++;
}
if (avail == 0)
return;
num_available_part_schemes = avail;
available_part_schemes = malloc(sizeof(*available_part_schemes)
* (avail+1));
if (available_part_schemes == NULL)
return;
for (out = available_part_schemes, i = 0; i < all_cnt; i++) {
if (!is_available[i])
continue;
*out++ = all_descs[i].ps;
}
*out = NULL;
free(is_available);
}
/*
* Final cleanup
*/
void
partitions_cleanup(void)
{
for (size_t i = 0; i < num_available_part_schemes; i++)
if (available_part_schemes[i]->cleanup != NULL)
available_part_schemes[i]->cleanup();
free(available_part_schemes);
}
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