svn commit: r188354 - in head/sys: geom/part modules/geom/geom_part
modules/geom/geom_part/geom_part_ebr
Marcel Moolenaar
marcel at FreeBSD.org
Sun Feb 8 15:51:45 PST 2009
Author: marcel
Date: Sun Feb 8 23:51:44 2009
New Revision: 188354
URL: http://svn.freebsd.org/changeset/base/188354
Log:
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.
Added:
head/sys/geom/part/g_part_ebr.c (contents, props changed)
head/sys/modules/geom/geom_part/geom_part_ebr/
head/sys/modules/geom/geom_part/geom_part_ebr/Makefile (contents, props changed)
Modified:
head/sys/geom/part/g_part_mbr.c
head/sys/modules/geom/geom_part/Makefile
Added: head/sys/geom/part/g_part_ebr.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/geom/part/g_part_ebr.c Sun Feb 8 23:51:44 2009 (r188354)
@@ -0,0 +1,339 @@
+/*-
+ * Copyright (c) 2007-2009 Marcel Moolenaar
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/bio.h>
+#include <sys/diskmbr.h>
+#include <sys/endian.h>
+#include <sys/kernel.h>
+#include <sys/kobj.h>
+#include <sys/limits.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/mutex.h>
+#include <sys/queue.h>
+#include <sys/sbuf.h>
+#include <sys/syscallsubr.h>
+#include <sys/systm.h>
+#include <geom/geom.h>
+#include <geom/part/g_part.h>
+
+#include "g_part_if.h"
+
+#define EBRSIZE 512
+
+struct g_part_ebr_table {
+ struct g_part_table base;
+};
+
+struct g_part_ebr_entry {
+ struct g_part_entry base;
+ struct dos_partition ent;
+};
+
+static int g_part_ebr_add(struct g_part_table *, struct g_part_entry *,
+ struct g_part_parms *);
+static int g_part_ebr_create(struct g_part_table *, struct g_part_parms *);
+static int g_part_ebr_destroy(struct g_part_table *, struct g_part_parms *);
+static void g_part_ebr_dumpconf(struct g_part_table *, struct g_part_entry *,
+ struct sbuf *, const char *);
+static int g_part_ebr_dumpto(struct g_part_table *, struct g_part_entry *);
+static int g_part_ebr_modify(struct g_part_table *, struct g_part_entry *,
+ struct g_part_parms *);
+static const char *g_part_ebr_name(struct g_part_table *, struct g_part_entry *,
+ char *, size_t);
+static int g_part_ebr_probe(struct g_part_table *, struct g_consumer *);
+static int g_part_ebr_read(struct g_part_table *, struct g_consumer *);
+static int g_part_ebr_setunset(struct g_part_table *, struct g_part_entry *,
+ const char *, unsigned int);
+static const char *g_part_ebr_type(struct g_part_table *, struct g_part_entry *,
+ char *, size_t);
+static int g_part_ebr_write(struct g_part_table *, struct g_consumer *);
+
+static kobj_method_t g_part_ebr_methods[] = {
+ KOBJMETHOD(g_part_add, g_part_ebr_add),
+ KOBJMETHOD(g_part_create, g_part_ebr_create),
+ KOBJMETHOD(g_part_destroy, g_part_ebr_destroy),
+ KOBJMETHOD(g_part_dumpconf, g_part_ebr_dumpconf),
+ KOBJMETHOD(g_part_dumpto, g_part_ebr_dumpto),
+ KOBJMETHOD(g_part_modify, g_part_ebr_modify),
+ KOBJMETHOD(g_part_name, g_part_ebr_name),
+ KOBJMETHOD(g_part_probe, g_part_ebr_probe),
+ KOBJMETHOD(g_part_read, g_part_ebr_read),
+ KOBJMETHOD(g_part_setunset, g_part_ebr_setunset),
+ KOBJMETHOD(g_part_type, g_part_ebr_type),
+ KOBJMETHOD(g_part_write, g_part_ebr_write),
+ { 0, 0 }
+};
+
+static struct g_part_scheme g_part_ebr_scheme = {
+ "EBR",
+ g_part_ebr_methods,
+ sizeof(struct g_part_ebr_table),
+ .gps_entrysz = sizeof(struct g_part_ebr_entry),
+ .gps_minent = 1,
+ .gps_maxent = INT_MAX,
+};
+G_PART_SCHEME_DECLARE(g_part_ebr);
+
+static void
+ebr_entry_decode(const char *p, struct dos_partition *ent)
+{
+ ent->dp_flag = p[0];
+ ent->dp_shd = p[1];
+ ent->dp_ssect = p[2];
+ ent->dp_scyl = p[3];
+ 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);
+}
+
+static int
+g_part_ebr_add(struct g_part_table *basetable, struct g_part_entry *baseentry,
+ struct g_part_parms *gpp)
+{
+
+ return (ENOSYS);
+}
+
+static int
+g_part_ebr_create(struct g_part_table *basetable, struct g_part_parms *gpp)
+{
+
+ return (ENOSYS);
+}
+
+static int
+g_part_ebr_destroy(struct g_part_table *basetable, struct g_part_parms *gpp)
+{
+
+ /* Wipe the first sector to clear the partitioning. */
+ basetable->gpt_smhead |= 1;
+ return (0);
+}
+
+static void
+g_part_ebr_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry,
+ struct sbuf *sb, const char *indent)
+{
+ struct g_part_ebr_entry *entry;
+
+ entry = (struct g_part_ebr_entry *)baseentry;
+ if (indent == NULL) {
+ /* conftxt: libdisk compatibility */
+ sbuf_printf(sb, " xs MBREXT xt %u", entry->ent.dp_typ);
+ } else if (entry != NULL) {
+ /* confxml: partition entry information */
+ sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent,
+ entry->ent.dp_typ);
+ if (entry->ent.dp_flag & 0x80)
+ sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent);
+ } else {
+ /* confxml: scheme information */
+ }
+}
+
+static int
+g_part_ebr_dumpto(struct g_part_table *table, struct g_part_entry *baseentry)
+{
+ struct g_part_ebr_entry *entry;
+
+ /* Allow dumping to a FreeBSD partition only. */
+ entry = (struct g_part_ebr_entry *)baseentry;
+ return ((entry->ent.dp_typ == DOSPTYP_386BSD) ? 1 : 0);
+}
+
+static int
+g_part_ebr_modify(struct g_part_table *basetable,
+ struct g_part_entry *baseentry, struct g_part_parms *gpp)
+{
+
+ return (ENOSYS);
+}
+
+static const char *
+g_part_ebr_name(struct g_part_table *table, struct g_part_entry *entry,
+ char *buf, size_t bufsz)
+{
+
+ snprintf(buf, bufsz, ".%08u", entry->gpe_index);
+ return (buf);
+}
+
+static int
+g_part_ebr_probe(struct g_part_table *table, struct g_consumer *cp)
+{
+ char psn[8];
+ struct g_provider *pp;
+ u_char *buf, *p;
+ int error, index, res, sum;
+ uint16_t magic;
+
+ pp = cp->provider;
+
+ /* Sanity-check the provider. */
+ if (pp->sectorsize < EBRSIZE || pp->mediasize < pp->sectorsize)
+ return (ENOSPC);
+ if (pp->sectorsize > 4096)
+ return (ENXIO);
+
+ /* Check that we have a parent and that it's a MBR. */
+ if (table->gpt_depth == 0)
+ return (ENXIO);
+ error = g_getattr("PART::scheme", cp, &psn);
+ if (error)
+ return (error);
+ if (strcmp(psn, "MBR"))
+ return (ENXIO);
+
+ /* Check that there's a EBR. */
+ buf = g_read_data(cp, 0L, pp->sectorsize, &error);
+ if (buf == NULL)
+ return (error);
+
+ /* We goto out on mismatch. */
+ res = ENXIO;
+
+ magic = le16dec(buf + DOSMAGICOFFSET);
+ if (magic != DOSMAGIC)
+ goto out;
+
+ /* The sector is all zeroes, except for the partition entries. */
+ sum = 0;
+ for (index = 0; index < DOSPARTOFF; index++)
+ sum += buf[index];
+ if (sum != 0)
+ goto out;
+
+ for (index = 0; index < NDOSPART; index++) {
+ p = buf + DOSPARTOFF + index * DOSPARTSIZE;
+ if (p[0] != 0 && p[0] != 0x80)
+ goto out;
+ if (index < 2)
+ continue;
+ /* The 3rd & 4th entries are always zero. */
+ if ((le64dec(p+0) + le64dec(p+8)) != 0)
+ goto out;
+ }
+
+ res = G_PART_PROBE_PRI_HIGH;
+
+ out:
+ g_free(buf);
+ return (res);
+}
+
+static int
+g_part_ebr_read(struct g_part_table *basetable, struct g_consumer *cp)
+{
+ struct dos_partition ent[2];
+ struct g_provider *pp;
+ struct g_part_entry *baseentry;
+ struct g_part_ebr_table *table;
+ struct g_part_ebr_entry *entry;
+ u_char *buf;
+ off_t ofs, msize;
+ u_int lba;
+ int error, index;
+
+ pp = cp->provider;
+ table = (struct g_part_ebr_table *)basetable;
+ msize = pp->mediasize / pp->sectorsize;
+
+ lba = 0;
+ while (1) {
+ ofs = (off_t)lba * pp->sectorsize;
+ buf = g_read_data(cp, ofs, pp->sectorsize, &error);
+ if (buf == NULL)
+ return (error);
+
+ ebr_entry_decode(buf + DOSPARTOFF + 0 * DOSPARTSIZE, ent + 0);
+ ebr_entry_decode(buf + DOSPARTOFF + 1 * DOSPARTSIZE, ent + 1);
+ g_free(buf);
+
+ if (ent[0].dp_typ == 0)
+ break;
+
+ 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)
+{
+
+ return (ENOSYS);
+}
+
+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)
+{
+
+ return (ENOSYS);
+}
Modified: head/sys/geom/part/g_part_mbr.c
==============================================================================
--- head/sys/geom/part/g_part_mbr.c Sun Feb 8 23:43:36 2009 (r188353)
+++ head/sys/geom/part/g_part_mbr.c Sun Feb 8 23:51:44 2009 (r188354)
@@ -314,6 +314,7 @@ g_part_mbr_name(struct g_part_table *tab
static int
g_part_mbr_probe(struct g_part_table *table, struct g_consumer *cp)
{
+ char psn[8];
struct g_provider *pp;
u_char *buf, *p;
int error, index, res, sum;
@@ -327,6 +328,11 @@ g_part_mbr_probe(struct g_part_table *ta
if (pp->sectorsize > 4096)
return (ENXIO);
+ /* We don't nest under an MBR (see EBR instead). */
+ error = g_getattr("PART::scheme", cp, &psn);
+ if (error == 0 && strcmp(psn, g_part_mbr_scheme.name) == 0)
+ return (ELOOP);
+
/* Check that there's a MBR. */
buf = g_read_data(cp, 0L, pp->sectorsize, &error);
if (buf == NULL)
Modified: head/sys/modules/geom/geom_part/Makefile
==============================================================================
--- head/sys/modules/geom/geom_part/Makefile Sun Feb 8 23:43:36 2009 (r188353)
+++ head/sys/modules/geom/geom_part/Makefile Sun Feb 8 23:51:44 2009 (r188354)
@@ -2,6 +2,7 @@
SUBDIR= geom_part_apm \
geom_part_bsd \
+ geom_part_ebr \
geom_part_gpt \
geom_part_mbr \
geom_part_pc98 \
Added: head/sys/modules/geom/geom_part/geom_part_ebr/Makefile
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/modules/geom/geom_part/geom_part_ebr/Makefile Sun Feb 8 23:51:44 2009 (r188354)
@@ -0,0 +1,12 @@
+# $FreeBSD$
+
+.PATH: ${.CURDIR}/../../../../geom/part
+
+KMOD= geom_part_ebr
+SRCS= g_part_ebr.c
+
+SRCS+= bus_if.h device_if.h g_part_if.h
+
+MFILES= kern/bus_if.m kern/device_if.m geom/part/g_part_if.m
+
+.include <bsd.kmod.mk>
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