Add the MBR partitioning scheme to g_part. This does not yet
support the ability to install boot code.
This commit is contained in:
Marcel Moolenaar
parent
d02e3c38ab
commit
6bc5044561
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=170651
@ -151,6 +151,7 @@ options GEOM_MULTIPATH # Disk multipath
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options GEOM_NOP # Test class.
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options GEOM_PART_APM # Apple partitioning
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options GEOM_PART_GPT # GPT partitioning
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options GEOM_PART_MBR # MBR partitioning
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options GEOM_PC98 # NEC PC9800 partitioning
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options GEOM_RAID3 # RAID3 functionality.
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options GEOM_SHSEC # Shared secret.
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@ -1260,6 +1260,7 @@ geom/part/g_part.c standard
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geom/part/g_part_if.m standard
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geom/part/g_part_apm.c optional geom_part_apm
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geom/part/g_part_gpt.c optional geom_part_gpt
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geom/part/g_part_mbr.c optional geom_part_mbr
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geom/raid3/g_raid3.c optional geom_raid3
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geom/raid3/g_raid3_ctl.c optional geom_raid3
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geom/shsec/g_shsec.c optional geom_shsec
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@ -89,6 +89,7 @@ GEOM_MULTIPATH opt_geom.h
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GEOM_NOP opt_geom.h
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GEOM_PART_APM opt_geom.h
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GEOM_PART_GPT opt_geom.h
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GEOM_PART_MBR opt_geom.h
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GEOM_PC98 opt_geom.h
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GEOM_RAID3 opt_geom.h
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GEOM_SHSEC opt_geom.h
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370
sys/geom/part/g_part_mbr.c
Normal file
370
sys/geom/part/g_part_mbr.c
Normal file
@ -0,0 +1,370 @@
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/*-
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* Copyright (c) 2007 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/bio.h>
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#include <sys/diskmbr.h>
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#include <sys/endian.h>
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#include <sys/kernel.h>
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#include <sys/kobj.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/queue.h>
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#include <sys/sbuf.h>
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#include <sys/systm.h>
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#include <geom/geom.h>
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#include <geom/part/g_part.h>
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#include "g_part_if.h"
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#define MBRSIZE 512
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struct g_part_mbr_table {
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struct g_part_table base;
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u_char mbr[MBRSIZE];
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int spt; /* Sectors/track. */
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};
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struct g_part_mbr_entry {
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struct g_part_entry base;
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struct dos_partition ent;
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};
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static int g_part_mbr_add(struct g_part_table *, struct g_part_entry *,
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struct g_part_parms *);
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static int g_part_mbr_create(struct g_part_table *, struct g_part_parms *);
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static int g_part_mbr_destroy(struct g_part_table *, struct g_part_parms *);
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static int g_part_mbr_dumpto(struct g_part_table *, struct g_part_entry *);
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static int g_part_mbr_modify(struct g_part_table *, struct g_part_entry *,
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struct g_part_parms *);
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static char *g_part_mbr_name(struct g_part_table *, struct g_part_entry *,
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char *, size_t);
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static int g_part_mbr_probe(struct g_part_table *, struct g_consumer *);
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static int g_part_mbr_read(struct g_part_table *, struct g_consumer *);
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static const char *g_part_mbr_type(struct g_part_table *, struct g_part_entry *,
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char *, size_t);
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static int g_part_mbr_write(struct g_part_table *, struct g_consumer *);
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static kobj_method_t g_part_mbr_methods[] = {
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KOBJMETHOD(g_part_add, g_part_mbr_add),
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KOBJMETHOD(g_part_create, g_part_mbr_create),
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KOBJMETHOD(g_part_destroy, g_part_mbr_destroy),
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KOBJMETHOD(g_part_dumpto, g_part_mbr_dumpto),
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KOBJMETHOD(g_part_modify, g_part_mbr_modify),
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KOBJMETHOD(g_part_name, g_part_mbr_name),
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KOBJMETHOD(g_part_probe, g_part_mbr_probe),
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KOBJMETHOD(g_part_read, g_part_mbr_read),
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KOBJMETHOD(g_part_type, g_part_mbr_type),
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KOBJMETHOD(g_part_write, g_part_mbr_write),
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{ 0, 0 }
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};
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static struct g_part_scheme g_part_mbr_scheme = {
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"MBR",
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g_part_mbr_methods,
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sizeof(struct g_part_mbr_table),
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.gps_entrysz = sizeof(struct g_part_mbr_entry),
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.gps_minent = NDOSPART,
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.gps_maxent = NDOSPART,
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};
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G_PART_SCHEME_DECLARE(g_part_mbr_scheme);
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static int
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mbr_parse_type(const char *type, u_char *dp_typ)
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{
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const char *alias;
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char *endp;
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long lt;
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if (type[0] == '!') {
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lt = strtol(type + 1, &endp, 0);
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if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256)
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return (EINVAL);
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*dp_typ = (u_char)lt;
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return (0);
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}
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alias = g_part_alias_name(G_PART_ALIAS_FREEBSD);
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if (!strcasecmp(type, alias)) {
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*dp_typ = DOSPTYP_386BSD;
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return (0);
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}
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return (EINVAL);
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}
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static int
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g_part_mbr_add(struct g_part_table *basetable, struct g_part_entry *baseentry,
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struct g_part_parms *gpp)
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{
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struct g_part_mbr_entry *entry;
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struct g_part_mbr_table *table;
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uint32_t start, size;
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if (gpp->gpp_parms & G_PART_PARM_LABEL)
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return (EINVAL);
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entry = (struct g_part_mbr_entry *)baseentry;
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table = (struct g_part_mbr_table *)basetable;
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start = gpp->gpp_start;
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size = gpp->gpp_size;
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if (size < table->spt)
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return (EINVAL);
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if (start % table->spt) {
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size = size - table->spt + (start % table->spt);
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start = start - (start % table->spt) + table->spt;
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}
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if (size % table->spt)
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size = size - (size % table->spt);
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if (size < table->spt)
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return (EINVAL);
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if (baseentry->gpe_deleted)
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bzero(&entry->ent, sizeof(entry->ent));
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KASSERT(baseentry->gpe_start <= start, (__func__));
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KASSERT(baseentry->gpe_end >= start + size - 1, (__func__));
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baseentry->gpe_start = start;
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baseentry->gpe_end = start + size - 1;
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entry->ent.dp_start = start;
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entry->ent.dp_size = size;
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return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ));
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}
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static int
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g_part_mbr_create(struct g_part_table *basetable, struct g_part_parms *gpp)
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{
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struct g_consumer *cp;
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struct g_provider *pp;
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struct g_part_mbr_table *table;
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uint64_t msize;
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int error, spt;
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pp = gpp->gpp_provider;
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cp = LIST_FIRST(&pp->consumers);
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error = g_getattr("GEOM::fwsectors", cp, &spt);
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if (error)
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spt = 17;
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else if (spt == 0)
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spt = 1;
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if (pp->sectorsize < MBRSIZE || pp->mediasize < spt * pp->sectorsize)
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return (ENOSPC);
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msize = pp->mediasize / pp->sectorsize;
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basetable->gpt_first = spt;
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basetable->gpt_last = msize - (msize % spt) - 1;
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table = (struct g_part_mbr_table *)basetable;
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le16enc(table->mbr + DOSMAGICOFFSET, DOSMAGIC);
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table->spt = spt;
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return (0);
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}
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static int
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g_part_mbr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp)
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{
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/* Wipe the first sector to clear the partitioning. */
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basetable->gpt_smhead |= 1;
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return (0);
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}
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static int
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g_part_mbr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry)
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{
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struct g_part_mbr_entry *entry;
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/* Allow dumping to a FreeBSD partition only. */
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entry = (struct g_part_mbr_entry *)baseentry;
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return ((entry->ent.dp_typ == DOSPTYP_386BSD) ? 1 : 0);
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}
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static int
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g_part_mbr_modify(struct g_part_table *basetable,
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struct g_part_entry *baseentry, struct g_part_parms *gpp)
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{
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struct g_part_mbr_entry *entry;
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if (gpp->gpp_parms & G_PART_PARM_LABEL)
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return (EINVAL);
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entry = (struct g_part_mbr_entry *)baseentry;
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if (gpp->gpp_parms & G_PART_PARM_TYPE)
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return (mbr_parse_type(gpp->gpp_type, &entry->ent.dp_typ));
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return (0);
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}
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static char *
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g_part_mbr_name(struct g_part_table *table, struct g_part_entry *baseentry,
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char *buf, size_t bufsz)
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{
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snprintf(buf, bufsz, "s%d", baseentry->gpe_index);
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return (buf);
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}
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static int
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g_part_mbr_probe(struct g_part_table *table, struct g_consumer *cp)
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{
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struct g_provider *pp;
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u_char *buf;
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int error, res;
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pp = cp->provider;
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/* Sanity-check the provider. */
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if (pp->sectorsize < MBRSIZE || pp->mediasize < pp->sectorsize)
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return (ENOSPC);
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/* Check that there's a MBR. */
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buf = g_read_data(cp, 0L, pp->sectorsize, &error);
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if (buf == NULL)
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return (error);
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res = le16dec(buf + DOSMAGICOFFSET);
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g_free(buf);
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return ((res == DOSMAGIC) ? G_PART_PROBE_PRI_NORM : ENXIO);
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}
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static int
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g_part_mbr_read(struct g_part_table *basetable, struct g_consumer *cp)
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{
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struct dos_partition ent;
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struct g_provider *pp;
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struct g_part_mbr_table *table;
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struct g_part_mbr_entry *entry;
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u_char *buf, *p;
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uint64_t msize;
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int error, index, spt;
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error = g_getattr("GEOM::fwsectors", cp, &spt);
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if (error)
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spt = 17;
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else if (spt == 0)
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spt = 1;
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pp = cp->provider;
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table = (struct g_part_mbr_table *)basetable;
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table->spt = spt;
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msize = pp->mediasize / pp->sectorsize;
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basetable->gpt_first = spt;
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basetable->gpt_last = msize - (msize % spt) - 1;
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basetable->gpt_entries = NDOSPART;
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buf = g_read_data(cp, 0L, pp->sectorsize, &error);
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if (buf == NULL)
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return (error);
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bcopy(buf, table->mbr, sizeof(table->mbr));
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for (index = NDOSPART - 1; index >= 0; index--) {
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p = buf + DOSPARTOFF + index * DOSPARTSIZE;
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ent.dp_flag = p[0];
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ent.dp_shd = p[1];
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ent.dp_ssect = p[2];
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ent.dp_scyl = p[3];
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ent.dp_typ = p[4];
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ent.dp_ehd = p[5];
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ent.dp_esect = p[6];
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ent.dp_ecyl = p[7];
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ent.dp_start = le32dec(p + 8);
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ent.dp_size = le32dec(p + 12);
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if (ent.dp_typ == 0 || ent.dp_typ == DOSPTYP_PMBR)
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continue;
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if (ent.dp_flag != 0 && ent.dp_flag != 0x80)
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continue;
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if (ent.dp_start == 0 || ent.dp_size == 0)
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continue;
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if ((ent.dp_start % spt) != 0)
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printf("GEOM: %s: partition %d does not start on a "
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"track boundary.\n", pp->name, index + 1);
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if ((ent.dp_size % spt) != 0)
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printf("GEOM: %s: partition %d does not end on a "
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"track boundary.\n", pp->name, index + 1);
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entry = (struct g_part_mbr_entry *)g_part_new_entry(basetable,
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index + 1, ent.dp_start, ent.dp_start + ent.dp_size - 1);
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entry->ent = ent;
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}
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return (0);
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}
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static const char *
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g_part_mbr_type(struct g_part_table *basetable, struct g_part_entry *baseentry,
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char *buf, size_t bufsz)
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{
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struct g_part_mbr_entry *entry;
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int type;
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entry = (struct g_part_mbr_entry *)baseentry;
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type = entry->ent.dp_typ;
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if (type == DOSPTYP_386BSD)
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return (g_part_alias_name(G_PART_ALIAS_FREEBSD));
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snprintf(buf, bufsz, "!%d", type);
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return (buf);
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}
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static int
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g_part_mbr_write(struct g_part_table *basetable, struct g_consumer *cp)
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{
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struct g_part_entry *baseentry;
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struct g_part_mbr_entry *entry;
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struct g_part_mbr_table *table;
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u_char *p;
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int error, index;
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table = (struct g_part_mbr_table *)basetable;
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baseentry = LIST_FIRST(&basetable->gpt_entry);
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for (index = 1; index <= basetable->gpt_entries; index++) {
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p = table->mbr + DOSPARTOFF + (index - 1) * DOSPARTSIZE;
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entry = (baseentry != NULL && index == baseentry->gpe_index)
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? (struct g_part_mbr_entry *)baseentry : NULL;
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if (entry != NULL && !baseentry->gpe_deleted) {
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p[0] = entry->ent.dp_flag;
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p[1] = entry->ent.dp_shd;
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p[2] = entry->ent.dp_ssect;
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p[3] = entry->ent.dp_scyl;
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p[4] = entry->ent.dp_typ;
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p[5] = entry->ent.dp_ehd;
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p[6] = entry->ent.dp_esect;
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p[7] = entry->ent.dp_ecyl;
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le32enc(p + 8, entry->ent.dp_start);
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le32enc(p + 12, entry->ent.dp_size);
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} else
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bzero(p, DOSPARTSIZE);
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if (entry != NULL)
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baseentry = LIST_NEXT(baseentry, gpe_entry);
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}
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error = g_write_data(cp, 0, table->mbr, cp->provider->sectorsize);
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return (error);
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}
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