| Current Path : /sys/geom/part/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/geom/part/g_part_ebr.c |
/*-
* 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 "opt_geom.h"
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/geom/part/g_part_ebr.c 232535 2012-03-05 04:51:22Z ae $");
#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/systm.h>
#include <sys/sysctl.h>
#include <geom/geom.h>
#include <geom/part/g_part.h>
#include "g_part_if.h"
FEATURE(geom_part_ebr,
"GEOM partitioning class for extended boot records support");
#if defined(GEOM_PART_EBR_COMPAT)
FEATURE(geom_part_ebr_compat,
"GEOM EBR partitioning class: backward-compatible partition names");
#endif
#define EBRSIZE 512
struct g_part_ebr_table {
struct g_part_table base;
#ifndef GEOM_PART_EBR_COMPAT
u_char ebr[EBRSIZE];
#endif
};
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 *);
#if defined(GEOM_PART_EBR_COMPAT)
static void g_part_ebr_fullname(struct g_part_table *, struct g_part_entry *,
struct sbuf *, const char *);
#endif
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_precheck(struct g_part_table *, enum g_part_ctl,
struct g_part_parms *);
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),
#if defined(GEOM_PART_EBR_COMPAT)
KOBJMETHOD(g_part_fullname, g_part_ebr_fullname),
#endif
KOBJMETHOD(g_part_modify, g_part_ebr_modify),
KOBJMETHOD(g_part_name, g_part_ebr_name),
KOBJMETHOD(g_part_precheck, g_part_ebr_precheck),
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 struct g_part_ebr_alias {
u_char typ;
int alias;
} ebr_alias_match[] = {
{ DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD },
{ DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS },
{ DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 },
{ DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP },
{ DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA },
{ DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM },
{ DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID },
};
static void ebr_set_chs(struct g_part_table *, uint32_t, u_char *, u_char *,
u_char *);
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 void
ebr_entry_link(struct g_part_table *table, uint32_t start, uint32_t end,
u_char *buf)
{
buf[0] = 0 /* dp_flag */;
ebr_set_chs(table, start, &buf[3] /* dp_scyl */, &buf[1] /* dp_shd */,
&buf[2] /* dp_ssect */);
buf[4] = 5 /* dp_typ */;
ebr_set_chs(table, end, &buf[7] /* dp_ecyl */, &buf[5] /* dp_ehd */,
&buf[6] /* dp_esect */);
le32enc(buf + 8, start);
le32enc(buf + 12, end - start + 1);
}
static int
ebr_parse_type(const char *type, u_char *dp_typ)
{
const char *alias;
char *endp;
long lt;
int i;
if (type[0] == '!') {
lt = strtol(type + 1, &endp, 0);
if (type[1] == '\0' || *endp != '\0' || lt <= 0 || lt >= 256)
return (EINVAL);
*dp_typ = (u_char)lt;
return (0);
}
for (i = 0;
i < sizeof(ebr_alias_match) / sizeof(ebr_alias_match[0]); i++) {
alias = g_part_alias_name(ebr_alias_match[i].alias);
if (strcasecmp(type, alias) == 0) {
*dp_typ = ebr_alias_match[i].typ;
return (0);
}
}
return (EINVAL);
}
static void
ebr_set_chs(struct g_part_table *table, uint32_t lba, u_char *cylp, u_char *hdp,
u_char *secp)
{
uint32_t cyl, hd, sec;
sec = lba % table->gpt_sectors + 1;
lba /= table->gpt_sectors;
hd = lba % table->gpt_heads;
lba /= table->gpt_heads;
cyl = lba;
if (cyl > 1023)
sec = hd = cyl = ~0;
*cylp = cyl & 0xff;
*hdp = hd & 0xff;
*secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0);
}
static int
g_part_ebr_add(struct g_part_table *basetable, struct g_part_entry *baseentry,
struct g_part_parms *gpp)
{
struct g_geom *gp;
struct g_provider *pp;
struct g_part_ebr_entry *entry;
uint32_t start, size, sectors;
if (gpp->gpp_parms & G_PART_PARM_LABEL)
return (EINVAL);
gp = basetable->gpt_gp;
pp = LIST_FIRST(&gp->consumer)->provider;
sectors = basetable->gpt_sectors;
entry = (struct g_part_ebr_entry *)baseentry;
start = gpp->gpp_start;
size = gpp->gpp_size;
if (size < 2 * sectors)
return (EINVAL);
if (start % sectors) {
size = size - sectors + (start % sectors);
start = start - (start % sectors) + sectors;
}
if (size % sectors)
size = size - (size % sectors);
if (size < 2 * sectors)
return (EINVAL);
if (baseentry->gpe_deleted)
bzero(&entry->ent, sizeof(entry->ent));
KASSERT(baseentry->gpe_start <= start, ("%s", __func__));
KASSERT(baseentry->gpe_end >= start + size - 1, ("%s", __func__));
baseentry->gpe_index = (start / sectors) + 1;
baseentry->gpe_offset = (off_t)(start + sectors) * pp->sectorsize;
baseentry->gpe_start = start;
baseentry->gpe_end = start + size - 1;
entry->ent.dp_start = sectors;
entry->ent.dp_size = size - sectors;
ebr_set_chs(basetable, entry->ent.dp_start, &entry->ent.dp_scyl,
&entry->ent.dp_shd, &entry->ent.dp_ssect);
ebr_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl,
&entry->ent.dp_ehd, &entry->ent.dp_esect);
return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ));
}
static int
g_part_ebr_create(struct g_part_table *basetable, struct g_part_parms *gpp)
{
char type[64];
struct g_consumer *cp;
struct g_provider *pp;
uint32_t msize;
int error;
pp = gpp->gpp_provider;
if (pp->sectorsize < EBRSIZE)
return (ENOSPC);
if (pp->sectorsize > 4096)
return (ENXIO);
/* Check that we have a parent and that it's a MBR. */
if (basetable->gpt_depth == 0)
return (ENXIO);
cp = LIST_FIRST(&pp->consumers);
error = g_getattr("PART::scheme", cp, &type);
if (error != 0)
return (error);
if (strcmp(type, "MBR") != 0)
return (ENXIO);
error = g_getattr("PART::type", cp, &type);
if (error != 0)
return (error);
if (strcmp(type, "ebr") != 0)
return (ENXIO);
msize = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX);
basetable->gpt_first = 0;
basetable->gpt_last = msize - 1;
basetable->gpt_entries = msize / basetable->gpt_sectors;
return (0);
}
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 or Linux swap partition only. */
entry = (struct g_part_ebr_entry *)baseentry;
return ((entry->ent.dp_typ == DOSPTYP_386BSD ||
entry->ent.dp_typ == DOSPTYP_LINSWP) ? 1 : 0);
}
#if defined(GEOM_PART_EBR_COMPAT)
static void
g_part_ebr_fullname(struct g_part_table *table, struct g_part_entry *entry,
struct sbuf *sb, const char *pfx)
{
struct g_part_entry *iter;
u_int idx;
idx = 5;
LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) {
if (iter == entry)
break;
idx++;
}
sbuf_printf(sb, "%.*s%u", (int)strlen(pfx) - 1, pfx, idx);
}
#endif
static int
g_part_ebr_modify(struct g_part_table *basetable,
struct g_part_entry *baseentry, struct g_part_parms *gpp)
{
struct g_part_ebr_entry *entry;
if (gpp->gpp_parms & G_PART_PARM_LABEL)
return (EINVAL);
entry = (struct g_part_ebr_entry *)baseentry;
if (gpp->gpp_parms & G_PART_PARM_TYPE)
return (ebr_parse_type(gpp->gpp_type, &entry->ent.dp_typ));
return (0);
}
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_precheck(struct g_part_table *table, enum g_part_ctl req,
struct g_part_parms *gpp)
{
#if defined(GEOM_PART_EBR_COMPAT)
if (req == G_PART_CTL_DESTROY)
return (0);
return (ECANCELED);
#else
/*
* The index is a function of the start of the partition.
* This is not something the user can override, nor is it
* something the common code will do right. We can set the
* index now so that we get what we need.
*/
if (req == G_PART_CTL_ADD)
gpp->gpp_index = (gpp->gpp_start / table->gpt_sectors) + 1;
return (0);
#endif
}
static int
g_part_ebr_probe(struct g_part_table *table, struct g_consumer *cp)
{
char type[64];
struct g_provider *pp;
u_char *buf, *p;
int error, index, res;
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, &type);
if (error != 0)
return (error);
if (strcmp(type, "MBR") != 0)
return (ENXIO);
/* Check that partition has type DOSPTYP_EBR. */
error = g_getattr("PART::type", cp, &type);
if (error != 0)
return (error);
if (strcmp(type, "ebr") != 0)
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;
for (index = 0; index < 2; index++) {
p = buf + DOSPARTOFF + index * DOSPARTSIZE;
if (p[0] != 0 && p[0] != 0x80)
goto out;
}
res = G_PART_PROBE_PRI_NORM;
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 = MIN(pp->mediasize / pp->sectorsize, UINT32_MAX);
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);
/* The 3rd & 4th entries should be zeroes. */
if (le64dec(buf + DOSPARTOFF + 2 * DOSPARTSIZE) +
le64dec(buf + DOSPARTOFF + 3 * DOSPARTSIZE) != 0) {
basetable->gpt_corrupt = 1;
printf("GEOM: %s: invalid entries in the EBR ignored.\n",
pp->name);
}
#ifndef GEOM_PART_EBR_COMPAT
/* Save the first EBR, it can contain a boot code */
if (lba == 0)
bcopy(buf, table->ebr, sizeof(table->ebr));
#endif
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 - 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 i;
entry = (struct g_part_ebr_entry *)baseentry;
for (i = 0;
i < sizeof(ebr_alias_match) / sizeof(ebr_alias_match[0]); i++) {
if (ebr_alias_match[i].typ == entry->ent.dp_typ)
return (g_part_alias_name(ebr_alias_match[i].alias));
}
snprintf(buf, bufsz, "!%d", entry->ent.dp_typ);
return (buf);
}
static int
g_part_ebr_write(struct g_part_table *basetable, struct g_consumer *cp)
{
#ifndef GEOM_PART_EBR_COMPAT
struct g_part_ebr_table *table;
#endif
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);
#ifndef GEOM_PART_EBR_COMPAT
table = (struct g_part_ebr_table *)basetable;
bcopy(table->ebr, buf, DOSPARTOFF);
#endif
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 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);
#ifndef GEOM_PART_EBR_COMPAT
if (baseentry->gpe_start == 0)
bzero(buf, DOSPARTOFF);
#endif
baseentry = next;
} while (!error && baseentry != NULL);
out:
g_free(buf);
return (error);
}