Add the EBR scheme. The EBR scheme supports the Extended Boot Records
found inside extended partitions and used to create logical partitions. At this time write/modify support is not (yet) present. The EBR and MBR schemes both check the parent scheme. The MBR will back-off when nested under another MBR, whereas the EBR only nests under a MBR.
This commit is contained in:
Marcel Moolenaar
parent
5defb9db6b
commit
5d68db5bc8
339
sys/geom/part/g_part_ebr.c
Normal file
339
sys/geom/part/g_part_ebr.c
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@ -0,0 +1,339 @@
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/*-
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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 <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/syscallsubr.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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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_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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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_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
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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 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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return (ENOSYS);
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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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return (ENOSYS);
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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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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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return (ENOSYS);
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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_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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/* The sector is all zeroes, except for the partition entries. */
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sum = 0;
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for (index = 0; index < DOSPARTOFF; 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_HIGH;
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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) {
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lba = ent[0].dp_start;
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continue;
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}
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index = (lba / basetable->gpt_sectors) + 1;
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baseentry = (struct g_part_entry *)g_part_new_entry(basetable,
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index, lba, lba + ent[0].dp_start + ent[0].dp_size - 1);
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baseentry->gpe_offset = (off_t)(lba + ent[0].dp_start) *
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pp->sectorsize;
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entry = (struct g_part_ebr_entry *)baseentry;
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entry->ent = ent[0];
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if (ent[1].dp_typ == 0)
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break;
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lba = ent[1].dp_start;
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}
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basetable->gpt_entries = msize / basetable->gpt_sectors;
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basetable->gpt_first = 0;
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basetable->gpt_last = msize - (msize % basetable->gpt_sectors) - 1;
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return (0);
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}
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static int
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g_part_ebr_setunset(struct g_part_table *table, struct g_part_entry *baseentry,
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const char *attrib, unsigned int set)
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{
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return (ENOSYS);
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}
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static const char *
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g_part_ebr_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_ebr_entry *entry;
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int type;
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entry = (struct g_part_ebr_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_ebr_write(struct g_part_table *basetable, struct g_consumer *cp)
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{
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return (ENOSYS);
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}
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@ -314,6 +314,7 @@ g_part_mbr_name(struct g_part_table *table, struct g_part_entry *baseentry,
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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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@ -327,6 +328,11 @@ g_part_mbr_probe(struct g_part_table *table, struct g_consumer *cp)
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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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@ -2,6 +2,7 @@
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SUBDIR= geom_part_apm \
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geom_part_bsd \
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geom_part_ebr \
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geom_part_gpt \
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geom_part_mbr \
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geom_part_pc98 \
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12
sys/modules/geom/geom_part/geom_part_ebr/Makefile
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12
sys/modules/geom/geom_part/geom_part_ebr/Makefile
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@ -0,0 +1,12 @@
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# $FreeBSD$
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.PATH: ${.CURDIR}/../../../../geom/part
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KMOD= geom_part_ebr
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SRCS= g_part_ebr.c
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SRCS+= bus_if.h device_if.h g_part_if.h
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MFILES= kern/bus_if.m kern/device_if.m geom/part/g_part_if.m
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.include <bsd.kmod.mk>
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