c3f9f306d2
types 0x05 and 0x0f, but 0x05 is preferred and used when partition is created with "gpart add -t ebr ...". This should keep EBR partitions accessible after r231754 for those, who have EBR on the partition with type 0x0f.
579 lines
16 KiB
C
579 lines
16 KiB
C
/*-
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* Copyright (c) 2007, 2008 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 <sys/sysctl.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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FEATURE(geom_part_mbr, "GEOM partitioning class for MBR support");
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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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};
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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_bootcode(struct g_part_table *, 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 void g_part_mbr_dumpconf(struct g_part_table *, struct g_part_entry *,
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struct sbuf *, const char *);
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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 const 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 int g_part_mbr_setunset(struct g_part_table *, struct g_part_entry *,
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const char *, unsigned int);
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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 int g_part_mbr_resize(struct g_part_table *, struct g_part_entry *,
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struct g_part_parms *);
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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_bootcode, g_part_mbr_bootcode),
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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_dumpconf, g_part_mbr_dumpconf),
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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_resize, g_part_mbr_resize),
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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_setunset, g_part_mbr_setunset),
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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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.gps_bootcodesz = MBRSIZE,
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};
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G_PART_SCHEME_DECLARE(g_part_mbr);
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static struct g_part_mbr_alias {
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u_char typ;
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int alias;
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} mbr_alias_match[] = {
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{ DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD },
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{ DOSPTYP_EXT, G_PART_ALIAS_EBR },
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{ DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS },
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{ DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 },
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{ DOSPTYP_EXTLBA, G_PART_ALIAS_EBR },
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{ DOSPTYP_LDM, G_PART_ALIAS_MS_LDM_DATA },
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{ DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP },
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{ DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA },
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{ DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM },
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{ DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID },
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{ DOSPTYP_PPCBOOT, G_PART_ALIAS_FREEBSD_BOOT },
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};
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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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int i;
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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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for (i = 0;
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i < sizeof(mbr_alias_match) / sizeof(mbr_alias_match[0]); i++) {
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alias = g_part_alias_name(mbr_alias_match[i].alias);
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if (strcasecmp(type, alias) == 0) {
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*dp_typ = mbr_alias_match[i].typ;
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return (0);
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}
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}
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return (EINVAL);
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}
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static int
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mbr_probe_bpb(u_char *bpb)
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{
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uint16_t secsz;
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uint8_t clstsz;
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#define PO2(x) ((x & (x - 1)) == 0)
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secsz = le16dec(bpb);
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if (secsz < 512 || secsz > 4096 || !PO2(secsz))
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return (0);
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clstsz = bpb[2];
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if (clstsz < 1 || clstsz > 128 || !PO2(clstsz))
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return (0);
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#undef PO2
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return (1);
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}
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static void
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mbr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp,
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u_char *secp)
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{
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uint32_t cyl, hd, sec;
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sec = lba % table->gpt_sectors + 1;
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lba /= table->gpt_sectors;
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hd = lba % table->gpt_heads;
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lba /= table->gpt_heads;
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cyl = lba;
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if (cyl > 1023)
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sec = hd = cyl = ~0;
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*cylp = cyl & 0xff;
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*hdp = hd & 0xff;
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*secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0);
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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, sectors;
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if (gpp->gpp_parms & G_PART_PARM_LABEL)
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return (EINVAL);
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sectors = basetable->gpt_sectors;
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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 < sectors)
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return (EINVAL);
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if (start % sectors) {
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size = size - sectors + (start % sectors);
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start = start - (start % sectors) + sectors;
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}
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if (size % sectors)
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size = size - (size % sectors);
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if (size < sectors)
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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, ("%s", __func__));
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KASSERT(baseentry->gpe_end >= start + size - 1, ("%s", __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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mbr_set_chs(basetable, baseentry->gpe_start, &entry->ent.dp_scyl,
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&entry->ent.dp_shd, &entry->ent.dp_ssect);
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mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl,
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&entry->ent.dp_ehd, &entry->ent.dp_esect);
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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_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp)
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{
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struct g_part_mbr_table *table;
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uint32_t dsn;
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if (gpp->gpp_codesize != MBRSIZE)
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return (ENODEV);
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table = (struct g_part_mbr_table *)basetable;
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dsn = *(uint32_t *)(table->mbr + DOSDSNOFF);
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bcopy(gpp->gpp_codeptr, table->mbr, DOSPARTOFF);
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if (dsn != 0)
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*(uint32_t *)(table->mbr + DOSDSNOFF) = dsn;
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return (0);
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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_provider *pp;
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struct g_part_mbr_table *table;
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pp = gpp->gpp_provider;
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if (pp->sectorsize < MBRSIZE)
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return (ENOSPC);
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basetable->gpt_first = basetable->gpt_sectors;
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basetable->gpt_last = MIN(pp->mediasize / pp->sectorsize,
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UINT32_MAX) - 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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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 void
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g_part_mbr_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry,
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struct sbuf *sb, const char *indent)
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{
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struct g_part_mbr_entry *entry;
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entry = (struct g_part_mbr_entry *)baseentry;
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if (indent == NULL) {
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/* conftxt: libdisk compatibility */
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sbuf_printf(sb, " xs MBR xt %u", entry->ent.dp_typ);
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} else if (entry != NULL) {
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/* confxml: partition entry information */
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sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent,
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entry->ent.dp_typ);
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if (entry->ent.dp_flag & 0x80)
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sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent);
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} else {
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/* confxml: scheme information */
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}
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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 or Linux swap partition only. */
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entry = (struct g_part_mbr_entry *)baseentry;
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return ((entry->ent.dp_typ == DOSPTYP_386BSD ||
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entry->ent.dp_typ == DOSPTYP_LINSWP) ? 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 int
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g_part_mbr_resize(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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uint32_t size, sectors;
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sectors = basetable->gpt_sectors;
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size = gpp->gpp_size;
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if (size < sectors)
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return (EINVAL);
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if (size % sectors)
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size = size - (size % sectors);
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if (size < sectors)
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return (EINVAL);
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entry = (struct g_part_mbr_entry *)baseentry;
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baseentry->gpe_end = baseentry->gpe_start + size - 1;
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entry->ent.dp_size = size;
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mbr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl,
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&entry->ent.dp_ehd, &entry->ent.dp_esect);
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return (0);
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}
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static const 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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char psn[8];
|
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struct g_provider *pp;
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u_char *buf, *p;
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int error, index, res, sum;
|
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uint16_t magic;
|
|
|
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pp = cp->provider;
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|
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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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if (pp->sectorsize > 4096)
|
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return (ENXIO);
|
|
|
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/* We don't nest under an MBR (see EBR instead). */
|
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error = g_getattr("PART::scheme", cp, &psn);
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if (error == 0 && strcmp(psn, g_part_mbr_scheme.name) == 0)
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return (ELOOP);
|
|
|
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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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/* We goto out on mismatch. */
|
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res = ENXIO;
|
|
|
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magic = le16dec(buf + DOSMAGICOFFSET);
|
|
if (magic != DOSMAGIC)
|
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goto out;
|
|
|
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for (index = 0; index < NDOSPART; index++) {
|
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p = buf + DOSPARTOFF + index * DOSPARTSIZE;
|
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if (p[0] != 0 && p[0] != 0x80)
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goto out;
|
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}
|
|
|
|
/*
|
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* If the partition table does not consist of all zeroes,
|
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* assume we have a MBR. If it's all zeroes, we could have
|
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* a boot sector. For example, a boot sector that doesn't
|
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* have boot code -- common on non-i386 hardware. In that
|
|
* case we check if we have a possible BPB. If so, then we
|
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* assume we have a boot sector instead.
|
|
*/
|
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sum = 0;
|
|
for (index = 0; index < NDOSPART * DOSPARTSIZE; index++)
|
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sum += buf[DOSPARTOFF + index];
|
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if (sum != 0 || !mbr_probe_bpb(buf + 0x0b))
|
|
res = G_PART_PROBE_PRI_NORM;
|
|
|
|
out:
|
|
g_free(buf);
|
|
return (res);
|
|
}
|
|
|
|
static int
|
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g_part_mbr_read(struct g_part_table *basetable, struct g_consumer *cp)
|
|
{
|
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struct dos_partition ent;
|
|
struct g_provider *pp;
|
|
struct g_part_mbr_table *table;
|
|
struct g_part_mbr_entry *entry;
|
|
u_char *buf, *p;
|
|
off_t chs, msize, first;
|
|
u_int sectors, heads;
|
|
int error, index;
|
|
|
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pp = cp->provider;
|
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table = (struct g_part_mbr_table *)basetable;
|
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first = basetable->gpt_sectors;
|
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msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX);
|
|
|
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buf = g_read_data(cp, 0L, pp->sectorsize, &error);
|
|
if (buf == NULL)
|
|
return (error);
|
|
|
|
bcopy(buf, table->mbr, sizeof(table->mbr));
|
|
for (index = NDOSPART - 1; index >= 0; index--) {
|
|
p = buf + DOSPARTOFF + index * DOSPARTSIZE;
|
|
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];
|
|
ent.dp_ehd = p[5];
|
|
ent.dp_esect = p[6];
|
|
ent.dp_ecyl = p[7];
|
|
ent.dp_start = le32dec(p + 8);
|
|
ent.dp_size = le32dec(p + 12);
|
|
if (ent.dp_typ == 0 || ent.dp_typ == DOSPTYP_PMBR)
|
|
continue;
|
|
if (ent.dp_start == 0 || ent.dp_size == 0)
|
|
continue;
|
|
sectors = ent.dp_esect & 0x3f;
|
|
if (sectors > basetable->gpt_sectors &&
|
|
!basetable->gpt_fixgeom) {
|
|
g_part_geometry_heads(msize, sectors, &chs, &heads);
|
|
if (chs != 0) {
|
|
basetable->gpt_sectors = sectors;
|
|
basetable->gpt_heads = heads;
|
|
}
|
|
}
|
|
if (ent.dp_start < first)
|
|
first = ent.dp_start;
|
|
entry = (struct g_part_mbr_entry *)g_part_new_entry(basetable,
|
|
index + 1, ent.dp_start, ent.dp_start + ent.dp_size - 1);
|
|
entry->ent = ent;
|
|
}
|
|
|
|
basetable->gpt_entries = NDOSPART;
|
|
basetable->gpt_first = basetable->gpt_sectors;
|
|
basetable->gpt_last = msize - 1;
|
|
|
|
if (first < basetable->gpt_first)
|
|
basetable->gpt_first = 1;
|
|
|
|
g_free(buf);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
g_part_mbr_setunset(struct g_part_table *table, struct g_part_entry *baseentry,
|
|
const char *attrib, unsigned int set)
|
|
{
|
|
struct g_part_entry *iter;
|
|
struct g_part_mbr_entry *entry;
|
|
int changed;
|
|
|
|
if (strcasecmp(attrib, "active") != 0)
|
|
return (EINVAL);
|
|
|
|
/* Only one entry can have the active attribute. */
|
|
LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) {
|
|
if (iter->gpe_deleted)
|
|
continue;
|
|
changed = 0;
|
|
entry = (struct g_part_mbr_entry *)iter;
|
|
if (iter == baseentry) {
|
|
if (set && (entry->ent.dp_flag & 0x80) == 0) {
|
|
entry->ent.dp_flag |= 0x80;
|
|
changed = 1;
|
|
} else if (!set && (entry->ent.dp_flag & 0x80)) {
|
|
entry->ent.dp_flag &= ~0x80;
|
|
changed = 1;
|
|
}
|
|
} else {
|
|
if (set && (entry->ent.dp_flag & 0x80)) {
|
|
entry->ent.dp_flag &= ~0x80;
|
|
changed = 1;
|
|
}
|
|
}
|
|
if (changed && !iter->gpe_created)
|
|
iter->gpe_modified = 1;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static const char *
|
|
g_part_mbr_type(struct g_part_table *basetable, struct g_part_entry *baseentry,
|
|
char *buf, size_t bufsz)
|
|
{
|
|
struct g_part_mbr_entry *entry;
|
|
int i;
|
|
|
|
entry = (struct g_part_mbr_entry *)baseentry;
|
|
for (i = 0;
|
|
i < sizeof(mbr_alias_match) / sizeof(mbr_alias_match[0]); i++) {
|
|
if (mbr_alias_match[i].typ == entry->ent.dp_typ)
|
|
return (g_part_alias_name(mbr_alias_match[i].alias));
|
|
}
|
|
snprintf(buf, bufsz, "!%d", entry->ent.dp_typ);
|
|
return (buf);
|
|
}
|
|
|
|
static int
|
|
g_part_mbr_write(struct g_part_table *basetable, struct g_consumer *cp)
|
|
{
|
|
struct g_part_entry *baseentry;
|
|
struct g_part_mbr_entry *entry;
|
|
struct g_part_mbr_table *table;
|
|
u_char *p;
|
|
int error, index;
|
|
|
|
table = (struct g_part_mbr_table *)basetable;
|
|
baseentry = LIST_FIRST(&basetable->gpt_entry);
|
|
for (index = 1; index <= basetable->gpt_entries; index++) {
|
|
p = table->mbr + DOSPARTOFF + (index - 1) * DOSPARTSIZE;
|
|
entry = (baseentry != NULL && index == baseentry->gpe_index)
|
|
? (struct g_part_mbr_entry *)baseentry : NULL;
|
|
if (entry != NULL && !baseentry->gpe_deleted) {
|
|
p[0] = entry->ent.dp_flag;
|
|
p[1] = entry->ent.dp_shd;
|
|
p[2] = entry->ent.dp_ssect;
|
|
p[3] = entry->ent.dp_scyl;
|
|
p[4] = entry->ent.dp_typ;
|
|
p[5] = entry->ent.dp_ehd;
|
|
p[6] = entry->ent.dp_esect;
|
|
p[7] = entry->ent.dp_ecyl;
|
|
le32enc(p + 8, entry->ent.dp_start);
|
|
le32enc(p + 12, entry->ent.dp_size);
|
|
} else
|
|
bzero(p, DOSPARTSIZE);
|
|
|
|
if (entry != NULL)
|
|
baseentry = LIST_NEXT(baseentry, gpe_entry);
|
|
}
|
|
|
|
error = g_write_data(cp, 0, table->mbr, cp->provider->sectorsize);
|
|
return (error);
|
|
}
|