622 lines
16 KiB
C
622 lines
16 KiB
C
/*-
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* Copyright (c) 2007-2009 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 "opt_geom.h"
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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 EBRSIZE 512
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struct g_part_ebr_table {
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struct g_part_table base;
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};
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struct g_part_ebr_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_ebr_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_ebr_create(struct g_part_table *, struct g_part_parms *);
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static int g_part_ebr_destroy(struct g_part_table *, struct g_part_parms *);
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static void g_part_ebr_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_ebr_dumpto(struct g_part_table *, struct g_part_entry *);
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#if defined(GEOM_PART_EBR_COMPAT)
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static void g_part_ebr_fullname(struct g_part_table *, struct g_part_entry *,
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struct sbuf *, const char *);
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#endif
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static int g_part_ebr_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_ebr_name(struct g_part_table *, struct g_part_entry *,
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char *, size_t);
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static int g_part_ebr_precheck(struct g_part_table *, enum g_part_ctl,
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struct g_part_parms *);
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static int g_part_ebr_probe(struct g_part_table *, struct g_consumer *);
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static int g_part_ebr_read(struct g_part_table *, struct g_consumer *);
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static int g_part_ebr_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_ebr_type(struct g_part_table *, struct g_part_entry *,
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char *, size_t);
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static int g_part_ebr_write(struct g_part_table *, struct g_consumer *);
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static kobj_method_t g_part_ebr_methods[] = {
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KOBJMETHOD(g_part_add, g_part_ebr_add),
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KOBJMETHOD(g_part_create, g_part_ebr_create),
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KOBJMETHOD(g_part_destroy, g_part_ebr_destroy),
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KOBJMETHOD(g_part_dumpconf, g_part_ebr_dumpconf),
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KOBJMETHOD(g_part_dumpto, g_part_ebr_dumpto),
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#if defined(GEOM_PART_EBR_COMPAT)
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KOBJMETHOD(g_part_fullname, g_part_ebr_fullname),
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#endif
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KOBJMETHOD(g_part_modify, g_part_ebr_modify),
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KOBJMETHOD(g_part_name, g_part_ebr_name),
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KOBJMETHOD(g_part_precheck, g_part_ebr_precheck),
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KOBJMETHOD(g_part_probe, g_part_ebr_probe),
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KOBJMETHOD(g_part_read, g_part_ebr_read),
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KOBJMETHOD(g_part_setunset, g_part_ebr_setunset),
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KOBJMETHOD(g_part_type, g_part_ebr_type),
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KOBJMETHOD(g_part_write, g_part_ebr_write),
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{ 0, 0 }
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};
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static struct g_part_scheme g_part_ebr_scheme = {
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"EBR",
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g_part_ebr_methods,
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sizeof(struct g_part_ebr_table),
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.gps_entrysz = sizeof(struct g_part_ebr_entry),
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.gps_minent = 1,
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.gps_maxent = INT_MAX,
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};
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G_PART_SCHEME_DECLARE(g_part_ebr);
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static void ebr_set_chs(struct g_part_table *, uint32_t, u_char *, u_char *,
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u_char *);
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static void
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ebr_entry_decode(const char *p, struct dos_partition *ent)
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{
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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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}
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static void
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ebr_entry_link(struct g_part_table *table, uint32_t start, uint32_t end,
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u_char *buf)
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{
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buf[0] = 0 /* dp_flag */;
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ebr_set_chs(table, start, &buf[3] /* dp_scyl */, &buf[1] /* dp_shd */,
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&buf[2] /* dp_ssect */);
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buf[4] = 5 /* dp_typ */;
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ebr_set_chs(table, end, &buf[7] /* dp_ecyl */, &buf[5] /* dp_ehd */,
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&buf[6] /* dp_esect */);
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le32enc(buf + 8, start);
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le32enc(buf + 12, end - start + 1);
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}
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static int
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ebr_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 void
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ebr_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_ebr_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_geom *gp;
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struct g_provider *pp;
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struct g_part_ebr_entry *entry;
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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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gp = basetable->gpt_gp;
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pp = LIST_FIRST(&gp->consumer)->provider;
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sectors = basetable->gpt_sectors;
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entry = (struct g_part_ebr_entry *)baseentry;
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start = gpp->gpp_start;
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size = gpp->gpp_size;
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if (size < 2 * 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 < 2 * 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_index = (start / sectors) + 1;
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baseentry->gpe_offset = (off_t)(start + sectors) * pp->sectorsize;
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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 = sectors;
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entry->ent.dp_size = size - sectors;
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ebr_set_chs(basetable, entry->ent.dp_start, &entry->ent.dp_scyl,
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&entry->ent.dp_shd, &entry->ent.dp_ssect);
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ebr_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 (ebr_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_ebr_create(struct g_part_table *basetable, struct g_part_parms *gpp)
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{
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char psn[8];
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struct g_consumer *cp;
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struct g_provider *pp;
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uint32_t msize;
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int error;
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pp = gpp->gpp_provider;
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if (pp->sectorsize < EBRSIZE)
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return (ENOSPC);
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if (pp->sectorsize > 4096)
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return (ENXIO);
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/* Check that we have a parent and that it's a MBR. */
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if (basetable->gpt_depth == 0)
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return (ENXIO);
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cp = LIST_FIRST(&pp->consumers);
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error = g_getattr("PART::scheme", cp, &psn);
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if (error)
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return (error);
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if (strcmp(psn, "MBR"))
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return (ENXIO);
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msize = MIN(pp->mediasize / pp->sectorsize, 0xffffffff);
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msize -= msize % basetable->gpt_sectors;
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basetable->gpt_first = 0;
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basetable->gpt_last = msize - 1;
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basetable->gpt_entries = msize / basetable->gpt_sectors;
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return (0);
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}
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static int
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g_part_ebr_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_ebr_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_ebr_entry *entry;
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entry = (struct g_part_ebr_entry *)baseentry;
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if (indent == NULL) {
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/* conftxt: libdisk compatibility */
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sbuf_printf(sb, " xs MBREXT 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_ebr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry)
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{
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struct g_part_ebr_entry *entry;
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/* Allow dumping to a FreeBSD partition only. */
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entry = (struct g_part_ebr_entry *)baseentry;
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return ((entry->ent.dp_typ == DOSPTYP_386BSD) ? 1 : 0);
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}
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#if defined(GEOM_PART_EBR_COMPAT)
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static void
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g_part_ebr_fullname(struct g_part_table *table, struct g_part_entry *entry,
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struct sbuf *sb, const char *pfx)
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{
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struct g_part_entry *iter;
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u_int idx;
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idx = 5;
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LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) {
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if (iter == entry)
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break;
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idx++;
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}
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sbuf_printf(sb, "%.*s%u", (int)strlen(pfx) - 1, pfx, idx);
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}
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#endif
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static int
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g_part_ebr_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_ebr_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_ebr_entry *)baseentry;
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if (gpp->gpp_parms & G_PART_PARM_TYPE)
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return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ));
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return (0);
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}
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static const char *
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g_part_ebr_name(struct g_part_table *table, struct g_part_entry *entry,
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char *buf, size_t bufsz)
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{
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snprintf(buf, bufsz, "+%08u", entry->gpe_index);
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return (buf);
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}
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static int
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g_part_ebr_precheck(struct g_part_table *table, enum g_part_ctl req,
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struct g_part_parms *gpp)
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{
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#if defined(GEOM_PART_EBR_COMPAT)
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return (ECANCELED);
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#else
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/*
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* The index is a function of the start of the partition.
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* This is not something the user can override, nor is it
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* something the common code will do right. We can set the
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* index now so that we get what we need.
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*/
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if (req == G_PART_CTL_ADD)
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gpp->gpp_index = (gpp->gpp_start / table->gpt_sectors) + 1;
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return (0);
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#endif
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}
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static int
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g_part_ebr_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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/* Sanity-check the provider. */
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if (pp->sectorsize < EBRSIZE || 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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/* Check that we have a parent and that it's a MBR. */
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if (table->gpt_depth == 0)
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return (ENXIO);
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error = g_getattr("PART::scheme", cp, &psn);
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if (error)
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return (error);
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if (strcmp(psn, "MBR"))
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return (ENXIO);
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/* Check that there's a EBR. */
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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);
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if (magic != DOSMAGIC)
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goto out;
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/*
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* The sector is all zeroes, except for the partition entries,
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* pseudo boot code and some signatures or disk serial number.
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* The latter can be found in the 9 bytes immediately in front
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* of the partition table.
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*/
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sum = 0;
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for (index = 96; index < DOSPARTOFF - 9; index++)
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sum += buf[index];
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if (sum != 0)
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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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if (index < 2)
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continue;
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/* The 3rd & 4th entries are always zero. */
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if ((le64dec(p+0) + le64dec(p+8)) != 0)
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goto out;
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}
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res = G_PART_PROBE_PRI_NORM;
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out:
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g_free(buf);
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return (res);
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}
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static int
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g_part_ebr_read(struct g_part_table *basetable, struct g_consumer *cp)
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{
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struct dos_partition ent[2];
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struct g_provider *pp;
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struct g_part_entry *baseentry;
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struct g_part_ebr_table *table;
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struct g_part_ebr_entry *entry;
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u_char *buf;
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off_t ofs, msize;
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u_int lba;
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int error, index;
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pp = cp->provider;
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table = (struct g_part_ebr_table *)basetable;
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msize = pp->mediasize / pp->sectorsize;
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lba = 0;
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while (1) {
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ofs = (off_t)lba * pp->sectorsize;
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buf = g_read_data(cp, ofs, pp->sectorsize, &error);
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if (buf == NULL)
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return (error);
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ebr_entry_decode(buf + DOSPARTOFF + 0 * DOSPARTSIZE, ent + 0);
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ebr_entry_decode(buf + DOSPARTOFF + 1 * DOSPARTSIZE, ent + 1);
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g_free(buf);
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if (ent[0].dp_typ == 0)
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break;
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|
|
if (ent[0].dp_typ == 5 && ent[1].dp_typ == 0) {
|
|
lba = ent[0].dp_start;
|
|
continue;
|
|
}
|
|
|
|
index = (lba / basetable->gpt_sectors) + 1;
|
|
baseentry = (struct g_part_entry *)g_part_new_entry(basetable,
|
|
index, lba, lba + ent[0].dp_start + ent[0].dp_size - 1);
|
|
baseentry->gpe_offset = (off_t)(lba + ent[0].dp_start) *
|
|
pp->sectorsize;
|
|
entry = (struct g_part_ebr_entry *)baseentry;
|
|
entry->ent = ent[0];
|
|
|
|
if (ent[1].dp_typ == 0)
|
|
break;
|
|
|
|
lba = ent[1].dp_start;
|
|
}
|
|
|
|
basetable->gpt_entries = msize / basetable->gpt_sectors;
|
|
basetable->gpt_first = 0;
|
|
basetable->gpt_last = msize - (msize % basetable->gpt_sectors) - 1;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
g_part_ebr_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_ebr_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_ebr_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_ebr_type(struct g_part_table *basetable, struct g_part_entry *baseentry,
|
|
char *buf, size_t bufsz)
|
|
{
|
|
struct g_part_ebr_entry *entry;
|
|
int type;
|
|
|
|
entry = (struct g_part_ebr_entry *)baseentry;
|
|
type = entry->ent.dp_typ;
|
|
if (type == DOSPTYP_386BSD)
|
|
return (g_part_alias_name(G_PART_ALIAS_FREEBSD));
|
|
snprintf(buf, bufsz, "!%d", type);
|
|
return (buf);
|
|
}
|
|
|
|
static int
|
|
g_part_ebr_write(struct g_part_table *basetable, struct g_consumer *cp)
|
|
{
|
|
struct g_provider *pp;
|
|
struct g_part_entry *baseentry, *next;
|
|
struct g_part_ebr_entry *entry;
|
|
u_char *buf;
|
|
u_char *p;
|
|
int error;
|
|
|
|
pp = cp->provider;
|
|
buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO);
|
|
le16enc(buf + DOSMAGICOFFSET, DOSMAGIC);
|
|
|
|
baseentry = LIST_FIRST(&basetable->gpt_entry);
|
|
while (baseentry != NULL && baseentry->gpe_deleted)
|
|
baseentry = LIST_NEXT(baseentry, gpe_entry);
|
|
|
|
/* Wipe-out the the first EBR when there are no slices. */
|
|
if (baseentry == NULL) {
|
|
error = g_write_data(cp, 0, buf, pp->sectorsize);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* If the first partition is not in LBA 0, we need to
|
|
* put a "link" EBR in LBA 0.
|
|
*/
|
|
if (baseentry->gpe_start != 0) {
|
|
ebr_entry_link(basetable, (uint32_t)baseentry->gpe_start,
|
|
(uint32_t)baseentry->gpe_end, buf + DOSPARTOFF);
|
|
error = g_write_data(cp, 0, buf, pp->sectorsize);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
|
|
do {
|
|
entry = (struct g_part_ebr_entry *)baseentry;
|
|
|
|
p = buf + DOSPARTOFF;
|
|
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);
|
|
|
|
next = LIST_NEXT(baseentry, gpe_entry);
|
|
while (next != NULL && next->gpe_deleted)
|
|
next = LIST_NEXT(next, gpe_entry);
|
|
|
|
p += DOSPARTSIZE;
|
|
if (next != NULL)
|
|
ebr_entry_link(basetable, (uint32_t)next->gpe_start,
|
|
(uint32_t)next->gpe_end, p);
|
|
else
|
|
bzero(p, DOSPARTSIZE);
|
|
|
|
error = g_write_data(cp, baseentry->gpe_start * pp->sectorsize,
|
|
buf, pp->sectorsize);
|
|
|
|
baseentry = next;
|
|
} while (!error && baseentry != NULL);
|
|
|
|
out:
|
|
g_free(buf);
|
|
return (error);
|
|
}
|