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freebsd-nq/sys/geom/part/g_part_ldm.c
Konstantin Belousov cd85379104 Make MAXPHYS tunable. Bump MAXPHYS to 1M. 
Replace MAXPHYS by runtime variable maxphys. It is initialized from
MAXPHYS by default, but can be also adjusted with the tunable kern.maxphys.

Make b_pages[] array in struct buf flexible.  Size b_pages[] for buffer
cache buffers exactly to atop(maxbcachebuf) (currently it is sized to
atop(MAXPHYS)), and b_pages[] for pbufs is sized to atop(maxphys) + 1.
The +1 for pbufs allow several pbuf consumers, among them vmapbuf(),
to use unaligned buffers still sized to maxphys, esp. when such
buffers come from userspace (*).  Overall, we save significant amount
of otherwise wasted memory in b_pages[] for buffer cache buffers,
while bumping MAXPHYS to desired high value.

Eliminate all direct uses of the MAXPHYS constant in kernel and driver
sources, except a place which initialize maxphys.  Some random (and
arguably weird) uses of MAXPHYS, e.g. in linuxolator, are converted
straight.  Some drivers, which use MAXPHYS to size embeded structures,
get private MAXPHYS-like constant; their convertion is out of scope
for this work.

Changes to cam/, dev/ahci, dev/ata, dev/mpr, dev/mpt, dev/mvs,
dev/siis, where either submitted by, or based on changes by mav.

Suggested by: mav (*)
Reviewed by:	imp, mav, imp, mckusick, scottl (intermediate versions)
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
Differential revision:	https://reviews.freebsd.org/D27225
2020-11-28 12:12:51 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2012 Andrey V. Elsukov <ae@FreeBSD.org>
* 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/gpt.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 <sys/uuid.h>
#include <geom/geom.h>
#include <geom/part/g_part.h>
#include "g_part_if.h"
FEATURE(geom_part_ldm, "GEOM partitioning class for LDM support");
SYSCTL_DECL(_kern_geom_part);
static SYSCTL_NODE(_kern_geom_part, OID_AUTO, ldm,
CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"GEOM_PART_LDM Logical Disk Manager");
static u_int ldm_debug = 0;
SYSCTL_UINT(_kern_geom_part_ldm, OID_AUTO, debug,
CTLFLAG_RWTUN, &ldm_debug, 0, "Debug level");
/*
* This allows access to mirrored LDM volumes. Since we do not
* doing mirroring here, it is not enabled by default.
*/
static u_int show_mirrors = 0;
SYSCTL_UINT(_kern_geom_part_ldm, OID_AUTO, show_mirrors,
CTLFLAG_RWTUN, &show_mirrors, 0, "Show mirrored volumes");
#define LDM_DEBUG(lvl, fmt, ...) do { \
if (ldm_debug >= (lvl)) { \
printf("GEOM_PART: " fmt "\n", __VA_ARGS__); \
} \
} while (0)
#define LDM_DUMP(buf, size) do { \
if (ldm_debug > 1) { \
hexdump(buf, size, NULL, 0); \
} \
} while (0)
/*
* There are internal representations of LDM structures.
*
* We do not keep all fields of on-disk structures, only most useful.
* All numbers in an on-disk structures are in big-endian format.
*/
/*
* Private header is 512 bytes long. There are three copies on each disk.
* Offset and sizes are in sectors. Location of each copy:
* - the first offset is relative to the disk start;
* - the second and third offset are relative to the LDM database start.
*
* On a disk partitioned with GPT, the LDM has not first private header.
*/
#define LDM_PH_MBRINDEX 0
#define LDM_PH_GPTINDEX 2
static const uint64_t ldm_ph_off[] = {6, 1856, 2047};
#define LDM_VERSION_2K 0x2000b
#define LDM_VERSION_VISTA 0x2000c
#define LDM_PH_VERSION_OFF 0x00c
#define LDM_PH_DISKGUID_OFF 0x030
#define LDM_PH_DGGUID_OFF 0x0b0
#define LDM_PH_DGNAME_OFF 0x0f0
#define LDM_PH_START_OFF 0x11b
#define LDM_PH_SIZE_OFF 0x123
#define LDM_PH_DB_OFF 0x12b
#define LDM_PH_DBSIZE_OFF 0x133
#define LDM_PH_TH1_OFF 0x13b
#define LDM_PH_TH2_OFF 0x143
#define LDM_PH_CONFSIZE_OFF 0x153
#define LDM_PH_LOGSIZE_OFF 0x15b
#define LDM_PH_SIGN "PRIVHEAD"
struct ldm_privhdr {
struct uuid disk_guid;
struct uuid dg_guid;
u_char dg_name[32];
uint64_t start; /* logical disk start */
uint64_t size; /* logical disk size */
uint64_t db_offset; /* LDM database start */
#define LDM_DB_SIZE 2048
uint64_t db_size; /* LDM database size */
#define LDM_TH_COUNT 2
uint64_t th_offset[LDM_TH_COUNT]; /* TOC header offsets */
uint64_t conf_size; /* configuration size */
uint64_t log_size; /* size of log */
};
/*
* Table of contents header is 512 bytes long.
* There are two identical copies at offsets from the private header.
* Offsets are relative to the LDM database start.
*/
#define LDM_TH_SIGN "TOCBLOCK"
#define LDM_TH_NAME1 "config"
#define LDM_TH_NAME2 "log"
#define LDM_TH_NAME1_OFF 0x024
#define LDM_TH_CONF_OFF 0x02e
#define LDM_TH_CONFSIZE_OFF 0x036
#define LDM_TH_NAME2_OFF 0x046
#define LDM_TH_LOG_OFF 0x050
#define LDM_TH_LOGSIZE_OFF 0x058
struct ldm_tochdr {
uint64_t conf_offset; /* configuration offset */
uint64_t log_offset; /* log offset */
};
/*
* LDM database header is 512 bytes long.
*/
#define LDM_VMDB_SIGN "VMDB"
#define LDM_DB_LASTSEQ_OFF 0x004
#define LDM_DB_SIZE_OFF 0x008
#define LDM_DB_STATUS_OFF 0x010
#define LDM_DB_VERSION_OFF 0x012
#define LDM_DB_DGNAME_OFF 0x016
#define LDM_DB_DGGUID_OFF 0x035
struct ldm_vmdbhdr {
uint32_t last_seq; /* sequence number of last VBLK */
uint32_t size; /* size of VBLK */
};
/*
* The LDM database configuration section contains VMDB header and
* many VBLKs. Each VBLK represents a disk group, disk partition,
* component or volume.
*
* The most interesting for us are volumes, they are represents
* partitions in the GEOM_PART meaning. But volume VBLK does not
* contain all information needed to create GEOM provider. And we
* should get this information from the related VBLK. This is how
* VBLK releated:
* Volumes <- Components <- Partitions -> Disks
*
* One volume can contain several components. In this case LDM
* does mirroring of volume data to each component.
*
* Also each component can contain several partitions (spanned or
* striped volumes).
*/
struct ldm_component {
uint64_t id; /* object id */
uint64_t vol_id; /* parent volume object id */
int count;
LIST_HEAD(, ldm_partition) partitions;
LIST_ENTRY(ldm_component) entry;
};
struct ldm_volume {
uint64_t id; /* object id */
uint64_t size; /* volume size */
uint8_t number; /* used for ordering */
uint8_t part_type; /* partition type */
int count;
LIST_HEAD(, ldm_component) components;
LIST_ENTRY(ldm_volume) entry;
};
struct ldm_disk {
uint64_t id; /* object id */
struct uuid guid; /* disk guid */
LIST_ENTRY(ldm_disk) entry;
};
#if 0
struct ldm_disk_group {
uint64_t id; /* object id */
struct uuid guid; /* disk group guid */
u_char name[32]; /* disk group name */
LIST_ENTRY(ldm_disk_group) entry;
};
#endif
struct ldm_partition {
uint64_t id; /* object id */
uint64_t disk_id; /* disk object id */
uint64_t comp_id; /* parent component object id */
uint64_t start; /* offset relative to disk start */
uint64_t offset; /* offset for spanned volumes */
uint64_t size; /* partition size */
LIST_ENTRY(ldm_partition) entry;
};
/*
* Each VBLK is 128 bytes long and has standard 16 bytes header.
* Some of VBLK's fields are fixed size, but others has variable size.
* Fields with variable size are prefixed with one byte length marker.
* Some fields are strings and also can have fixed size and variable.
* Strings with fixed size are NULL-terminated, others are not.
* All VBLKs have same several first fields:
* Offset Size Description
* ---------------+---------------+--------------------------
* 0x00 16 standard VBLK header
* 0x10 2 update status
* 0x13 1 VBLK type
* 0x18 PS object id
* 0x18+ PN object name
*
* o Offset 0x18+ means '0x18 + length of all variable-width fields'
* o 'P' in size column means 'prefixed' (variable-width),
* 'S' - string, 'N' - number.
*/
#define LDM_VBLK_SIGN "VBLK"
#define LDM_VBLK_SEQ_OFF 0x04
#define LDM_VBLK_GROUP_OFF 0x08
#define LDM_VBLK_INDEX_OFF 0x0c
#define LDM_VBLK_COUNT_OFF 0x0e
#define LDM_VBLK_TYPE_OFF 0x13
#define LDM_VBLK_OID_OFF 0x18
struct ldm_vblkhdr {
uint32_t seq; /* sequence number */
uint32_t group; /* group number */
uint16_t index; /* index in the group */
uint16_t count; /* number of entries in the group */
};
#define LDM_VBLK_T_COMPONENT 0x32
#define LDM_VBLK_T_PARTITION 0x33
#define LDM_VBLK_T_DISK 0x34
#define LDM_VBLK_T_DISKGROUP 0x35
#define LDM_VBLK_T_DISK4 0x44
#define LDM_VBLK_T_DISKGROUP4 0x45
#define LDM_VBLK_T_VOLUME 0x51
struct ldm_vblk {
uint8_t type; /* VBLK type */
union {
uint64_t id;
struct ldm_volume vol;
struct ldm_component comp;
struct ldm_disk disk;
struct ldm_partition part;
#if 0
struct ldm_disk_group disk_group;
#endif
} u;
LIST_ENTRY(ldm_vblk) entry;
};
/*
* Some VBLKs contains a bit more data than can fit into 128 bytes. These
* VBLKs are called eXtended VBLK. Before parsing, the data from these VBLK
* should be placed into continuous memory buffer. We can determine xVBLK
* by the count field in the standard VBLK header (count > 1).
*/
struct ldm_xvblk {
uint32_t group; /* xVBLK group number */
uint32_t size; /* the total size of xVBLK */
uint8_t map; /* bitmask of currently saved VBLKs */
u_char *data; /* xVBLK data */
LIST_ENTRY(ldm_xvblk) entry;
};
/* The internal representation of LDM database. */
struct ldm_db {
struct ldm_privhdr ph; /* private header */
struct ldm_tochdr th; /* TOC header */
struct ldm_vmdbhdr dh; /* VMDB header */
LIST_HEAD(, ldm_volume) volumes;
LIST_HEAD(, ldm_disk) disks;
LIST_HEAD(, ldm_vblk) vblks;
LIST_HEAD(, ldm_xvblk) xvblks;
};
static struct uuid gpt_uuid_ms_ldm_metadata = GPT_ENT_TYPE_MS_LDM_METADATA;
struct g_part_ldm_table {
struct g_part_table base;
uint64_t db_offset;
int is_gpt;
};
struct g_part_ldm_entry {
struct g_part_entry base;
uint8_t type;
};
static int g_part_ldm_add(struct g_part_table *, struct g_part_entry *,
struct g_part_parms *);
static int g_part_ldm_bootcode(struct g_part_table *, struct g_part_parms *);
static int g_part_ldm_create(struct g_part_table *, struct g_part_parms *);
static int g_part_ldm_destroy(struct g_part_table *, struct g_part_parms *);
static void g_part_ldm_dumpconf(struct g_part_table *, struct g_part_entry *,
struct sbuf *, const char *);
static int g_part_ldm_dumpto(struct g_part_table *, struct g_part_entry *);
static int g_part_ldm_modify(struct g_part_table *, struct g_part_entry *,
struct g_part_parms *);
static const char *g_part_ldm_name(struct g_part_table *, struct g_part_entry *,
char *, size_t);
static int g_part_ldm_probe(struct g_part_table *, struct g_consumer *);
static int g_part_ldm_read(struct g_part_table *, struct g_consumer *);
static const char *g_part_ldm_type(struct g_part_table *, struct g_part_entry *,
char *, size_t);
static int g_part_ldm_write(struct g_part_table *, struct g_consumer *);
static kobj_method_t g_part_ldm_methods[] = {
KOBJMETHOD(g_part_add, g_part_ldm_add),
KOBJMETHOD(g_part_bootcode, g_part_ldm_bootcode),
KOBJMETHOD(g_part_create, g_part_ldm_create),
KOBJMETHOD(g_part_destroy, g_part_ldm_destroy),
KOBJMETHOD(g_part_dumpconf, g_part_ldm_dumpconf),
KOBJMETHOD(g_part_dumpto, g_part_ldm_dumpto),
KOBJMETHOD(g_part_modify, g_part_ldm_modify),
KOBJMETHOD(g_part_name, g_part_ldm_name),
KOBJMETHOD(g_part_probe, g_part_ldm_probe),
KOBJMETHOD(g_part_read, g_part_ldm_read),
KOBJMETHOD(g_part_type, g_part_ldm_type),
KOBJMETHOD(g_part_write, g_part_ldm_write),
{ 0, 0 }
};
static struct g_part_scheme g_part_ldm_scheme = {
"LDM",
g_part_ldm_methods,
sizeof(struct g_part_ldm_table),
.gps_entrysz = sizeof(struct g_part_ldm_entry)
};
G_PART_SCHEME_DECLARE(g_part_ldm);
MODULE_VERSION(geom_part_ldm, 0);
static struct g_part_ldm_alias {
u_char typ;
int alias;
} ldm_alias_match[] = {
{ DOSPTYP_386BSD, G_PART_ALIAS_FREEBSD },
{ DOSPTYP_FAT32, G_PART_ALIAS_MS_FAT32 },
{ DOSPTYP_FAT32LBA, G_PART_ALIAS_MS_FAT32LBA },
{ DOSPTYP_LDM, G_PART_ALIAS_MS_LDM_DATA },
{ DOSPTYP_LINLVM, G_PART_ALIAS_LINUX_LVM },
{ DOSPTYP_LINRAID, G_PART_ALIAS_LINUX_RAID },
{ DOSPTYP_LINSWP, G_PART_ALIAS_LINUX_SWAP },
{ DOSPTYP_LINUX, G_PART_ALIAS_LINUX_DATA },
{ DOSPTYP_NTFS, G_PART_ALIAS_MS_NTFS },
};
static u_char*
ldm_privhdr_read(struct g_consumer *cp, uint64_t off, int *error)
{
struct g_provider *pp;
u_char *buf;
pp = cp->provider;
buf = g_read_data(cp, off, pp->sectorsize, error);
if (buf == NULL)
return (NULL);
if (memcmp(buf, LDM_PH_SIGN, strlen(LDM_PH_SIGN)) != 0) {
LDM_DEBUG(1, "%s: invalid LDM private header signature",
pp->name);
g_free(buf);
buf = NULL;
*error = EINVAL;
}
return (buf);
}
static int
ldm_privhdr_parse(struct g_consumer *cp, struct ldm_privhdr *hdr,
const u_char *buf)
{
uint32_t version;
int error;
memset(hdr, 0, sizeof(*hdr));
version = be32dec(buf + LDM_PH_VERSION_OFF);
if (version != LDM_VERSION_2K &&
version != LDM_VERSION_VISTA) {
LDM_DEBUG(0, "%s: unsupported LDM version %u.%u",
cp->provider->name, version >> 16,
version & 0xFFFF);
return (ENXIO);
}
error = parse_uuid(buf + LDM_PH_DISKGUID_OFF, &hdr->disk_guid);
if (error != 0)
return (error);
error = parse_uuid(buf + LDM_PH_DGGUID_OFF, &hdr->dg_guid);
if (error != 0)
return (error);
strncpy(hdr->dg_name, buf + LDM_PH_DGNAME_OFF, sizeof(hdr->dg_name));
hdr->start = be64dec(buf + LDM_PH_START_OFF);
hdr->size = be64dec(buf + LDM_PH_SIZE_OFF);
hdr->db_offset = be64dec(buf + LDM_PH_DB_OFF);
hdr->db_size = be64dec(buf + LDM_PH_DBSIZE_OFF);
hdr->th_offset[0] = be64dec(buf + LDM_PH_TH1_OFF);
hdr->th_offset[1] = be64dec(buf + LDM_PH_TH2_OFF);
hdr->conf_size = be64dec(buf + LDM_PH_CONFSIZE_OFF);
hdr->log_size = be64dec(buf + LDM_PH_LOGSIZE_OFF);
return (0);
}
static int
ldm_privhdr_check(struct ldm_db *db, struct g_consumer *cp, int is_gpt)
{
struct g_consumer *cp2;
struct g_provider *pp;
struct ldm_privhdr hdr;
uint64_t offset, last;
int error, found, i;
u_char *buf;
pp = cp->provider;
if (is_gpt) {
/*
* The last LBA is used in several checks below, for the
* GPT case it should be calculated relative to the whole
* disk.
*/
cp2 = LIST_FIRST(&pp->geom->consumer);
last =
cp2->provider->mediasize / cp2->provider->sectorsize - 1;
} else
last = pp->mediasize / pp->sectorsize - 1;
for (found = 0, i = is_gpt; i < nitems(ldm_ph_off); i++) {
offset = ldm_ph_off[i];
/*
* In the GPT case consumer is attached to the LDM metadata
* partition and we don't need add db_offset.
*/
if (!is_gpt)
offset += db->ph.db_offset;
if (i == LDM_PH_MBRINDEX) {
/*
* Prepare to errors and setup new base offset
* to read backup private headers. Assume that LDM
* database is in the last 1Mbyte area.
*/
db->ph.db_offset = last - LDM_DB_SIZE;
}
buf = ldm_privhdr_read(cp, offset * pp->sectorsize, &error);
if (buf == NULL) {
LDM_DEBUG(1, "%s: failed to read private header "
"%d at LBA %ju", pp->name, i, (uintmax_t)offset);
continue;
}
error = ldm_privhdr_parse(cp, &hdr, buf);
if (error != 0) {
LDM_DEBUG(1, "%s: failed to parse private "
"header %d", pp->name, i);
LDM_DUMP(buf, pp->sectorsize);
g_free(buf);
continue;
}
g_free(buf);
if (hdr.start > last ||
hdr.start + hdr.size - 1 > last ||
(hdr.start + hdr.size - 1 > hdr.db_offset && !is_gpt) ||
hdr.db_size != LDM_DB_SIZE ||
hdr.db_offset + LDM_DB_SIZE - 1 > last ||
hdr.th_offset[0] >= LDM_DB_SIZE ||
hdr.th_offset[1] >= LDM_DB_SIZE ||
hdr.conf_size + hdr.log_size >= LDM_DB_SIZE) {
LDM_DEBUG(1, "%s: invalid values in the "
"private header %d", pp->name, i);
LDM_DEBUG(2, "%s: start: %jd, size: %jd, "
"db_offset: %jd, db_size: %jd, th_offset0: %jd, "
"th_offset1: %jd, conf_size: %jd, log_size: %jd, "
"last: %jd", pp->name, hdr.start, hdr.size,
hdr.db_offset, hdr.db_size, hdr.th_offset[0],
hdr.th_offset[1], hdr.conf_size, hdr.log_size,
last);
continue;
}
if (found != 0 && memcmp(&db->ph, &hdr, sizeof(hdr)) != 0) {
LDM_DEBUG(0, "%s: private headers are not equal",
pp->name);
if (i > 1) {
/*
* We have different headers in the LDM.
* We can not trust this metadata.
*/
LDM_DEBUG(0, "%s: refuse LDM metadata",
pp->name);
return (EINVAL);
}
/*
* We already have read primary private header
* and it differs from this backup one.
* Prefer the backup header and save it.
*/
found = 0;
}
if (found == 0)
memcpy(&db->ph, &hdr, sizeof(hdr));
found = 1;
}
if (found == 0) {
LDM_DEBUG(1, "%s: valid LDM private header not found",
pp->name);
return (ENXIO);
}
return (0);
}
static int
ldm_gpt_check(struct ldm_db *db, struct g_consumer *cp)
{
struct g_part_table *gpt;
struct g_part_entry *e;
struct g_consumer *cp2;
int error;
cp2 = LIST_NEXT(cp, consumer);
g_topology_lock();
gpt = cp->provider->geom->softc;
error = 0;
LIST_FOREACH(e, &gpt->gpt_entry, gpe_entry) {
if (cp->provider == e->gpe_pp) {
/* ms-ldm-metadata partition */
if (e->gpe_start != db->ph.db_offset ||
e->gpe_end != db->ph.db_offset + LDM_DB_SIZE - 1)
error++;
} else if (cp2->provider == e->gpe_pp) {
/* ms-ldm-data partition */
if (e->gpe_start != db->ph.start ||
e->gpe_end != db->ph.start + db->ph.size - 1)
error++;
}
if (error != 0) {
LDM_DEBUG(0, "%s: GPT partition %d boundaries "
"do not match with the LDM metadata",
e->gpe_pp->name, e->gpe_index);
error = ENXIO;
break;
}
}
g_topology_unlock();
return (error);
}
static int
ldm_tochdr_check(struct ldm_db *db, struct g_consumer *cp)
{
struct g_provider *pp;
struct ldm_tochdr hdr;
uint64_t offset, conf_size, log_size;
int error, found, i;
u_char *buf;
pp = cp->provider;
for (i = 0, found = 0; i < LDM_TH_COUNT; i++) {
offset = db->ph.db_offset + db->ph.th_offset[i];
buf = g_read_data(cp,
offset * pp->sectorsize, pp->sectorsize, &error);
if (buf == NULL) {
LDM_DEBUG(1, "%s: failed to read TOC header "
"at LBA %ju", pp->name, (uintmax_t)offset);
continue;
}
if (memcmp(buf, LDM_TH_SIGN, strlen(LDM_TH_SIGN)) != 0 ||
memcmp(buf + LDM_TH_NAME1_OFF, LDM_TH_NAME1,
strlen(LDM_TH_NAME1)) != 0 ||
memcmp(buf + LDM_TH_NAME2_OFF, LDM_TH_NAME2,
strlen(LDM_TH_NAME2)) != 0) {
LDM_DEBUG(1, "%s: failed to parse TOC header "
"at LBA %ju", pp->name, (uintmax_t)offset);
LDM_DUMP(buf, pp->sectorsize);
g_free(buf);
continue;
}
hdr.conf_offset = be64dec(buf + LDM_TH_CONF_OFF);
hdr.log_offset = be64dec(buf + LDM_TH_LOG_OFF);
conf_size = be64dec(buf + LDM_TH_CONFSIZE_OFF);
log_size = be64dec(buf + LDM_TH_LOGSIZE_OFF);
if (conf_size != db->ph.conf_size ||
hdr.conf_offset + conf_size >= LDM_DB_SIZE ||
log_size != db->ph.log_size ||
hdr.log_offset + log_size >= LDM_DB_SIZE) {
LDM_DEBUG(1, "%s: invalid values in the "
"TOC header at LBA %ju", pp->name,
(uintmax_t)offset);
LDM_DUMP(buf, pp->sectorsize);
g_free(buf);
continue;
}
g_free(buf);
if (found == 0)
memcpy(&db->th, &hdr, sizeof(hdr));
found = 1;
}
if (found == 0) {
LDM_DEBUG(0, "%s: valid LDM TOC header not found.",
pp->name);
return (ENXIO);
}
return (0);
}
static int
ldm_vmdbhdr_check(struct ldm_db *db, struct g_consumer *cp)
{
struct g_provider *pp;
struct uuid dg_guid;
uint64_t offset;
uint32_t version;
int error;
u_char *buf;
pp = cp->provider;
offset = db->ph.db_offset + db->th.conf_offset;
buf = g_read_data(cp, offset * pp->sectorsize, pp->sectorsize,
&error);
if (buf == NULL) {
LDM_DEBUG(0, "%s: failed to read VMDB header at "
"LBA %ju", pp->name, (uintmax_t)offset);
return (error);
}
if (memcmp(buf, LDM_VMDB_SIGN, strlen(LDM_VMDB_SIGN)) != 0) {
g_free(buf);
LDM_DEBUG(0, "%s: failed to parse VMDB header at "
"LBA %ju", pp->name, (uintmax_t)offset);
return (ENXIO);
}
/* Check version. */
version = be32dec(buf + LDM_DB_VERSION_OFF);
if (version != 0x4000A) {
g_free(buf);
LDM_DEBUG(0, "%s: unsupported VMDB version %u.%u",
pp->name, version >> 16, version & 0xFFFF);
return (ENXIO);
}
/*
* Check VMDB update status:
* 1 - in a consistent state;
* 2 - in a creation phase;
* 3 - in a deletion phase;
*/
if (be16dec(buf + LDM_DB_STATUS_OFF) != 1) {
g_free(buf);
LDM_DEBUG(0, "%s: VMDB is not in a consistent state",
pp->name);
return (ENXIO);
}
db->dh.last_seq = be32dec(buf + LDM_DB_LASTSEQ_OFF);
db->dh.size = be32dec(buf + LDM_DB_SIZE_OFF);
error = parse_uuid(buf + LDM_DB_DGGUID_OFF, &dg_guid);
/* Compare disk group name and guid from VMDB and private headers */
if (error != 0 || db->dh.size == 0 ||
pp->sectorsize % db->dh.size != 0 ||
strncmp(buf + LDM_DB_DGNAME_OFF, db->ph.dg_name, 31) != 0 ||
memcmp(&dg_guid, &db->ph.dg_guid, sizeof(dg_guid)) != 0 ||
db->dh.size * db->dh.last_seq >
db->ph.conf_size * pp->sectorsize) {
LDM_DEBUG(0, "%s: invalid values in the VMDB header",
pp->name);
LDM_DUMP(buf, pp->sectorsize);
g_free(buf);
return (EINVAL);
}
g_free(buf);
return (0);
}
static int
ldm_xvblk_handle(struct ldm_db *db, struct ldm_vblkhdr *vh, const u_char *p)
{
struct ldm_xvblk *blk;
size_t size;
size = db->dh.size - 16;
LIST_FOREACH(blk, &db->xvblks, entry)
if (blk->group == vh->group)
break;
if (blk == NULL) {
blk = g_malloc(sizeof(*blk), M_WAITOK | M_ZERO);
blk->group = vh->group;
blk->size = size * vh->count + 16;
blk->data = g_malloc(blk->size, M_WAITOK | M_ZERO);
blk->map = 0xFF << vh->count;
LIST_INSERT_HEAD(&db->xvblks, blk, entry);
}
if ((blk->map & (1 << vh->index)) != 0) {
/* Block with given index has been already saved. */
return (EINVAL);
}
/* Copy the data block to the place related to index. */
memcpy(blk->data + size * vh->index + 16, p + 16, size);
blk->map |= 1 << vh->index;
return (0);
}
/* Read the variable-width numeric field and return new offset */
static int
ldm_vnum_get(const u_char *buf, int offset, uint64_t *result, size_t range)
{
uint64_t num;
uint8_t len;
len = buf[offset++];
if (len > sizeof(uint64_t) || len + offset >= range)
return (-1);
for (num = 0; len > 0; len--)
num = (num << 8) | buf[offset++];
*result = num;
return (offset);
}
/* Read the variable-width string and return new offset */
static int
ldm_vstr_get(const u_char *buf, int offset, u_char *result,
size_t maxlen, size_t range)
{
uint8_t len;
len = buf[offset++];
if (len >= maxlen || len + offset >= range)
return (-1);
memcpy(result, buf + offset, len);
result[len] = '\0';
return (offset + len);
}
/* Just skip the variable-width variable and return new offset */
static int
ldm_vparm_skip(const u_char *buf, int offset, size_t range)
{
uint8_t len;
len = buf[offset++];
if (offset + len >= range)
return (-1);
return (offset + len);
}
static int
ldm_vblk_handle(struct ldm_db *db, const u_char *p, size_t size)
{
struct ldm_vblk *blk;
struct ldm_volume *volume, *last;
const char *errstr;
u_char vstr[64];
int error, offset;
blk = g_malloc(sizeof(*blk), M_WAITOK | M_ZERO);
blk->type = p[LDM_VBLK_TYPE_OFF];
offset = ldm_vnum_get(p, LDM_VBLK_OID_OFF, &blk->u.id, size);
if (offset < 0) {
errstr = "object id";
goto fail;
}
offset = ldm_vstr_get(p, offset, vstr, sizeof(vstr), size);
if (offset < 0) {
errstr = "object name";
goto fail;
}
switch (blk->type) {
/*
* Component VBLK fields:
* Offset Size Description
* ------------+-------+------------------------
* 0x18+ PS volume state
* 0x18+5 PN component children count
* 0x1D+16 PN parent's volume object id
* 0x2D+1 PN stripe size
*/
case LDM_VBLK_T_COMPONENT:
offset = ldm_vparm_skip(p, offset, size);
if (offset < 0) {
errstr = "volume state";
goto fail;
}
offset = ldm_vparm_skip(p, offset + 5, size);
if (offset < 0) {
errstr = "children count";
goto fail;
}
offset = ldm_vnum_get(p, offset + 16,
&blk->u.comp.vol_id, size);
if (offset < 0) {
errstr = "volume id";
goto fail;
}
break;
/*
* Partition VBLK fields:
* Offset Size Description
* ------------+-------+------------------------
* 0x18+12 8 partition start offset
* 0x18+20 8 volume offset
* 0x18+28 PN partition size
* 0x34+ PN parent's component object id
* 0x34+ PN disk's object id
*/
case LDM_VBLK_T_PARTITION:
if (offset + 28 >= size) {
errstr = "too small buffer";
goto fail;
}
blk->u.part.start = be64dec(p + offset + 12);
blk->u.part.offset = be64dec(p + offset + 20);
offset = ldm_vnum_get(p, offset + 28, &blk->u.part.size, size);
if (offset < 0) {
errstr = "partition size";
goto fail;
}
offset = ldm_vnum_get(p, offset, &blk->u.part.comp_id, size);
if (offset < 0) {
errstr = "component id";
goto fail;
}
offset = ldm_vnum_get(p, offset, &blk->u.part.disk_id, size);
if (offset < 0) {
errstr = "disk id";
goto fail;
}
break;
/*
* Disk VBLK fields:
* Offset Size Description
* ------------+-------+------------------------
* 0x18+ PS disk GUID
*/
case LDM_VBLK_T_DISK:
errstr = "disk guid";
offset = ldm_vstr_get(p, offset, vstr, sizeof(vstr), size);
if (offset < 0)
goto fail;
error = parse_uuid(vstr, &blk->u.disk.guid);
if (error != 0)
goto fail;
LIST_INSERT_HEAD(&db->disks, &blk->u.disk, entry);
break;
/*
* Disk group VBLK fields:
* Offset Size Description
* ------------+-------+------------------------
* 0x18+ PS disk group GUID
*/
case LDM_VBLK_T_DISKGROUP:
#if 0
strncpy(blk->u.disk_group.name, vstr,
sizeof(blk->u.disk_group.name));
offset = ldm_vstr_get(p, offset, vstr, sizeof(vstr), size);
if (offset < 0) {
errstr = "disk group guid";
goto fail;
}
error = parse_uuid(name, &blk->u.disk_group.guid);
if (error != 0) {
errstr = "disk group guid";
goto fail;
}
LIST_INSERT_HEAD(&db->groups, &blk->u.disk_group, entry);
#endif
break;
/*
* Disk VBLK fields:
* Offset Size Description
* ------------+-------+------------------------
* 0x18+ 16 disk GUID
*/
case LDM_VBLK_T_DISK4:
be_uuid_dec(p + offset, &blk->u.disk.guid);
LIST_INSERT_HEAD(&db->disks, &blk->u.disk, entry);
break;
/*
* Disk group VBLK fields:
* Offset Size Description
* ------------+-------+------------------------
* 0x18+ 16 disk GUID
*/
case LDM_VBLK_T_DISKGROUP4:
#if 0
strncpy(blk->u.disk_group.name, vstr,
sizeof(blk->u.disk_group.name));
be_uuid_dec(p + offset, &blk->u.disk.guid);
LIST_INSERT_HEAD(&db->groups, &blk->u.disk_group, entry);
#endif
break;
/*
* Volume VBLK fields:
* Offset Size Description
* ------------+-------+------------------------
* 0x18+ PS volume type
* 0x18+ PS unknown
* 0x18+ 14(S) volume state
* 0x18+16 1 volume number
* 0x18+21 PN volume children count
* 0x2D+16 PN volume size
* 0x3D+4 1 partition type
*/
case LDM_VBLK_T_VOLUME:
offset = ldm_vparm_skip(p, offset, size);
if (offset < 0) {
errstr = "volume type";
goto fail;
}
offset = ldm_vparm_skip(p, offset, size);
if (offset < 0) {
errstr = "unknown param";
goto fail;
}
if (offset + 21 >= size) {
errstr = "too small buffer";
goto fail;
}
blk->u.vol.number = p[offset + 16];
offset = ldm_vparm_skip(p, offset + 21, size);
if (offset < 0) {
errstr = "children count";
goto fail;
}
offset = ldm_vnum_get(p, offset + 16, &blk->u.vol.size, size);
if (offset < 0) {
errstr = "volume size";
goto fail;
}
if (offset + 4 >= size) {
errstr = "too small buffer";
goto fail;
}
blk->u.vol.part_type = p[offset + 4];
/* keep volumes ordered by volume number */
last = NULL;
LIST_FOREACH(volume, &db->volumes, entry) {
if (volume->number > blk->u.vol.number)
break;
last = volume;
}
if (last != NULL)
LIST_INSERT_AFTER(last, &blk->u.vol, entry);
else
LIST_INSERT_HEAD(&db->volumes, &blk->u.vol, entry);
break;
default:
LDM_DEBUG(1, "unknown VBLK type 0x%02x\n", blk->type);
LDM_DUMP(p, size);
}
LIST_INSERT_HEAD(&db->vblks, blk, entry);
return (0);
fail:
LDM_DEBUG(0, "failed to parse '%s' in VBLK of type 0x%02x\n",
errstr, blk->type);
LDM_DUMP(p, size);
g_free(blk);
return (EINVAL);
}
static void
ldm_vmdb_free(struct ldm_db *db)
{
struct ldm_vblk *vblk;
struct ldm_xvblk *xvblk;
while (!LIST_EMPTY(&db->xvblks)) {
xvblk = LIST_FIRST(&db->xvblks);
LIST_REMOVE(xvblk, entry);
g_free(xvblk->data);
g_free(xvblk);
}
while (!LIST_EMPTY(&db->vblks)) {
vblk = LIST_FIRST(&db->vblks);
LIST_REMOVE(vblk, entry);
g_free(vblk);
}
}
static int
ldm_vmdb_parse(struct ldm_db *db, struct g_consumer *cp)
{
struct g_provider *pp;
struct ldm_vblk *vblk;
struct ldm_xvblk *xvblk;
struct ldm_volume *volume;
struct ldm_component *comp;
struct ldm_vblkhdr vh;
u_char *buf, *p;
size_t size, n, sectors;
uint64_t offset;
int error;
pp = cp->provider;
size = howmany(db->dh.last_seq * db->dh.size, pp->sectorsize);
size -= 1; /* one sector takes vmdb header */
for (n = 0; n < size; n += maxphys / pp->sectorsize) {
offset = db->ph.db_offset + db->th.conf_offset + n + 1;
sectors = (size - n) > (maxphys / pp->sectorsize) ?
maxphys / pp->sectorsize : size - n;
/* read VBLKs */
buf = g_read_data(cp, offset * pp->sectorsize,
sectors * pp->sectorsize, &error);
if (buf == NULL) {
LDM_DEBUG(0, "%s: failed to read VBLK\n",
pp->name);
goto fail;
}
for (p = buf; p < buf + sectors * pp->sectorsize;
p += db->dh.size) {
if (memcmp(p, LDM_VBLK_SIGN,
strlen(LDM_VBLK_SIGN)) != 0) {
LDM_DEBUG(0, "%s: no VBLK signature\n",
pp->name);
LDM_DUMP(p, db->dh.size);
goto fail;
}
vh.seq = be32dec(p + LDM_VBLK_SEQ_OFF);
vh.group = be32dec(p + LDM_VBLK_GROUP_OFF);
/* skip empty blocks */
if (vh.seq == 0 || vh.group == 0)
continue;
vh.index = be16dec(p + LDM_VBLK_INDEX_OFF);
vh.count = be16dec(p + LDM_VBLK_COUNT_OFF);
if (vh.count == 0 || vh.count > 4 ||
vh.seq > db->dh.last_seq) {
LDM_DEBUG(0, "%s: invalid values "
"in the VBLK header\n", pp->name);
LDM_DUMP(p, db->dh.size);
goto fail;
}
if (vh.count > 1) {
error = ldm_xvblk_handle(db, &vh, p);
if (error != 0) {
LDM_DEBUG(0, "%s: xVBLK "
"is corrupted\n", pp->name);
LDM_DUMP(p, db->dh.size);
goto fail;
}
continue;
}
if (be16dec(p + 16) != 0)
LDM_DEBUG(1, "%s: VBLK update"
" status is %u\n", pp->name,
be16dec(p + 16));
error = ldm_vblk_handle(db, p, db->dh.size);
if (error != 0)
goto fail;
}
g_free(buf);
buf = NULL;
}
/* Parse xVBLKs */
while (!LIST_EMPTY(&db->xvblks)) {
xvblk = LIST_FIRST(&db->xvblks);
if (xvblk->map == 0xFF) {
error = ldm_vblk_handle(db, xvblk->data, xvblk->size);
if (error != 0)
goto fail;
} else {
LDM_DEBUG(0, "%s: incomplete or corrupt "
"xVBLK found\n", pp->name);
goto fail;
}
LIST_REMOVE(xvblk, entry);
g_free(xvblk->data);
g_free(xvblk);
}
/* construct all VBLKs relations */
LIST_FOREACH(volume, &db->volumes, entry) {
LIST_FOREACH(vblk, &db->vblks, entry)
if (vblk->type == LDM_VBLK_T_COMPONENT &&
vblk->u.comp.vol_id == volume->id) {
LIST_INSERT_HEAD(&volume->components,
&vblk->u.comp, entry);
volume->count++;
}
LIST_FOREACH(comp, &volume->components, entry)
LIST_FOREACH(vblk, &db->vblks, entry)
if (vblk->type == LDM_VBLK_T_PARTITION &&
vblk->u.part.comp_id == comp->id) {
LIST_INSERT_HEAD(&comp->partitions,
&vblk->u.part, entry);
comp->count++;
}
}
return (0);
fail:
ldm_vmdb_free(db);
g_free(buf);
return (ENXIO);
}
static int
g_part_ldm_add(struct g_part_table *basetable, struct g_part_entry *baseentry,
struct g_part_parms *gpp)
{
return (ENOSYS);
}
static int
g_part_ldm_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp)
{
return (ENOSYS);
}
static int
g_part_ldm_create(struct g_part_table *basetable, struct g_part_parms *gpp)
{
return (ENOSYS);
}
static int
g_part_ldm_destroy(struct g_part_table *basetable, struct g_part_parms *gpp)
{
struct g_part_ldm_table *table;
struct g_provider *pp;
table = (struct g_part_ldm_table *)basetable;
/*
* To destroy LDM on a disk partitioned with GPT we should delete
* ms-ldm-metadata partition, but we can't do this via standard
* GEOM_PART method.
*/
if (table->is_gpt)
return (ENOSYS);
pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider;
/*
* To destroy LDM we should wipe MBR, first private header and
* backup private headers.
*/
basetable->gpt_smhead = (1 << ldm_ph_off[0]) | 1;
/*
* Don't touch last backup private header when LDM database is
* not located in the last 1MByte area.
* XXX: can't remove all blocks.
*/
if (table->db_offset + LDM_DB_SIZE ==
pp->mediasize / pp->sectorsize)
basetable->gpt_smtail = 1;
return (0);
}
static void
g_part_ldm_dumpconf(struct g_part_table *basetable,
struct g_part_entry *baseentry, struct sbuf *sb, const char *indent)
{
struct g_part_ldm_entry *entry;
entry = (struct g_part_ldm_entry *)baseentry;
if (indent == NULL) {
/* conftxt: libdisk compatibility */
sbuf_printf(sb, " xs LDM xt %u", entry->type);
} else if (entry != NULL) {
/* confxml: partition entry information */
sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent,
entry->type);
} else {
/* confxml: scheme information */
}
}
static int
g_part_ldm_dumpto(struct g_part_table *table, struct g_part_entry *baseentry)
{
return (0);
}
static int
g_part_ldm_modify(struct g_part_table *basetable,
struct g_part_entry *baseentry, struct g_part_parms *gpp)
{
return (ENOSYS);
}
static const char *
g_part_ldm_name(struct g_part_table *table, struct g_part_entry *baseentry,
char *buf, size_t bufsz)
{
snprintf(buf, bufsz, "s%d", baseentry->gpe_index);
return (buf);
}
static int
ldm_gpt_probe(struct g_part_table *basetable, struct g_consumer *cp)
{
struct g_part_ldm_table *table;
struct g_part_table *gpt;
struct g_part_entry *entry;
struct g_consumer *cp2;
struct gpt_ent *part;
u_char *buf;
int error;
/*
* XXX: We use some knowledge about GEOM_PART_GPT internal
* structures, but it is easier than parse GPT by himself.
*/
g_topology_lock();
gpt = cp->provider->geom->softc;
LIST_FOREACH(entry, &gpt->gpt_entry, gpe_entry) {
part = (struct gpt_ent *)(entry + 1);
/* Search ms-ldm-metadata partition */
if (memcmp(&part->ent_type,
&gpt_uuid_ms_ldm_metadata, sizeof(struct uuid)) != 0 ||
entry->gpe_end - entry->gpe_start < LDM_DB_SIZE - 1)
continue;
/* Create new consumer and attach it to metadata partition */
cp2 = g_new_consumer(cp->geom);
error = g_attach(cp2, entry->gpe_pp);
if (error != 0) {
g_destroy_consumer(cp2);
g_topology_unlock();
return (ENXIO);
}
error = g_access(cp2, 1, 0, 0);
if (error != 0) {
g_detach(cp2);
g_destroy_consumer(cp2);
g_topology_unlock();
return (ENXIO);
}
g_topology_unlock();
LDM_DEBUG(2, "%s: LDM metadata partition %s found in the GPT",
cp->provider->name, cp2->provider->name);
/* Read the LDM private header */
buf = ldm_privhdr_read(cp2,
ldm_ph_off[LDM_PH_GPTINDEX] * cp2->provider->sectorsize,
&error);
if (buf != NULL) {
table = (struct g_part_ldm_table *)basetable;
table->is_gpt = 1;
g_free(buf);
return (G_PART_PROBE_PRI_HIGH);
}
/* second consumer is no longer needed. */
g_topology_lock();
g_access(cp2, -1, 0, 0);
g_detach(cp2);
g_destroy_consumer(cp2);
break;
}
g_topology_unlock();
return (ENXIO);
}
static int
g_part_ldm_probe(struct g_part_table *basetable, struct g_consumer *cp)
{
struct g_provider *pp;
u_char *buf, type[64];
int error, idx;
pp = cp->provider;
if (pp->sectorsize != 512)
return (ENXIO);
error = g_getattr("PART::scheme", cp, &type);
if (error == 0 && strcmp(type, "GPT") == 0) {
if (g_getattr("PART::type", cp, &type) != 0 ||
strcmp(type, "ms-ldm-data") != 0)
return (ENXIO);
error = ldm_gpt_probe(basetable, cp);
return (error);
}
if (basetable->gpt_depth != 0)
return (ENXIO);
/* LDM has 1M metadata area */
if (pp->mediasize <= 1024 * 1024)
return (ENOSPC);
/* Check that there's a MBR */
buf = g_read_data(cp, 0, pp->sectorsize, &error);
if (buf == NULL)
return (error);
if (le16dec(buf + DOSMAGICOFFSET) != DOSMAGIC) {
g_free(buf);
return (ENXIO);
}
error = ENXIO;
/* Check that we have LDM partitions in the MBR */
for (idx = 0; idx < NDOSPART && error != 0; idx++) {
if (buf[DOSPARTOFF + idx * DOSPARTSIZE + 4] == DOSPTYP_LDM)
error = 0;
}
g_free(buf);
if (error == 0) {
LDM_DEBUG(2, "%s: LDM data partitions found in MBR",
pp->name);
/* Read the LDM private header */
buf = ldm_privhdr_read(cp,
ldm_ph_off[LDM_PH_MBRINDEX] * pp->sectorsize, &error);
if (buf == NULL)
return (error);
g_free(buf);
return (G_PART_PROBE_PRI_HIGH);
}
return (error);
}
static int
g_part_ldm_read(struct g_part_table *basetable, struct g_consumer *cp)
{
struct g_part_ldm_table *table;
struct g_part_ldm_entry *entry;
struct g_consumer *cp2;
struct ldm_component *comp;
struct ldm_partition *part;
struct ldm_volume *vol;
struct ldm_disk *disk;
struct ldm_db db;
int error, index, skipped;
table = (struct g_part_ldm_table *)basetable;
memset(&db, 0, sizeof(db));
cp2 = cp; /* ms-ldm-data */
if (table->is_gpt)
cp = LIST_FIRST(&cp->geom->consumer); /* ms-ldm-metadata */
/* Read and parse LDM private headers. */
error = ldm_privhdr_check(&db, cp, table->is_gpt);
if (error != 0)
goto gpt_cleanup;
basetable->gpt_first = table->is_gpt ? 0: db.ph.start;
basetable->gpt_last = basetable->gpt_first + db.ph.size - 1;
table->db_offset = db.ph.db_offset;
/* Make additional checks for GPT */
if (table->is_gpt) {
error = ldm_gpt_check(&db, cp);
if (error != 0)
goto gpt_cleanup;
/*
* Now we should reset database offset to zero, because our
* consumer cp is attached to the ms-ldm-metadata partition
* and we don't need add db_offset to read from it.
*/
db.ph.db_offset = 0;
}
/* Read and parse LDM TOC headers. */
error = ldm_tochdr_check(&db, cp);
if (error != 0)
goto gpt_cleanup;
/* Read and parse LDM VMDB header. */
error = ldm_vmdbhdr_check(&db, cp);
if (error != 0)
goto gpt_cleanup;
error = ldm_vmdb_parse(&db, cp);
/*
* For the GPT case we must detach and destroy
* second consumer before return.
*/
gpt_cleanup:
if (table->is_gpt) {
g_topology_lock();
g_access(cp, -1, 0, 0);
g_detach(cp);
g_destroy_consumer(cp);
g_topology_unlock();
cp = cp2;
}
if (error != 0)
return (error);
/* Search current disk in the disk list. */
LIST_FOREACH(disk, &db.disks, entry)
if (memcmp(&disk->guid, &db.ph.disk_guid,
sizeof(struct uuid)) == 0)
break;
if (disk == NULL) {
LDM_DEBUG(1, "%s: no LDM volumes on this disk",
cp->provider->name);
ldm_vmdb_free(&db);
return (ENXIO);
}
index = 1;
LIST_FOREACH(vol, &db.volumes, entry) {
LIST_FOREACH(comp, &vol->components, entry) {
/* Skip volumes from different disks. */
part = LIST_FIRST(&comp->partitions);
if (part->disk_id != disk->id)
continue;
skipped = 0;
/* We don't support spanned and striped volumes. */
if (comp->count > 1 || part->offset != 0) {
LDM_DEBUG(1, "%s: LDM volume component "
"%ju has %u partitions. Skipped",
cp->provider->name, (uintmax_t)comp->id,
comp->count);
skipped = 1;
}
/*
* Allow mirrored volumes only when they are explicitly
* allowed with kern.geom.part.ldm.show_mirrors=1.
*/
if (vol->count > 1 && show_mirrors == 0) {
LDM_DEBUG(1, "%s: LDM volume %ju has %u "
"components. Skipped",
cp->provider->name, (uintmax_t)vol->id,
vol->count);
skipped = 1;
}
entry = (struct g_part_ldm_entry *)g_part_new_entry(
basetable, index++,
basetable->gpt_first + part->start,
basetable->gpt_first + part->start +
part->size - 1);
/*
* Mark skipped partition as ms-ldm-data partition.
* We do not support them, but it is better to show
* that we have something there, than just show
* free space.
*/
if (skipped == 0)
entry->type = vol->part_type;
else
entry->type = DOSPTYP_LDM;
LDM_DEBUG(1, "%s: new volume id: %ju, start: %ju,"
" end: %ju, type: 0x%02x\n", cp->provider->name,
(uintmax_t)part->id,(uintmax_t)part->start +
basetable->gpt_first, (uintmax_t)part->start +
part->size + basetable->gpt_first - 1,
vol->part_type);
}
}
ldm_vmdb_free(&db);
return (error);
}
static const char *
g_part_ldm_type(struct g_part_table *basetable, struct g_part_entry *baseentry,
char *buf, size_t bufsz)
{
struct g_part_ldm_entry *entry;
int i;
entry = (struct g_part_ldm_entry *)baseentry;
for (i = 0; i < nitems(ldm_alias_match); i++) {
if (ldm_alias_match[i].typ == entry->type)
return (g_part_alias_name(ldm_alias_match[i].alias));
}
snprintf(buf, bufsz, "!%d", entry->type);
return (buf);
}
static int
g_part_ldm_write(struct g_part_table *basetable, struct g_consumer *cp)
{
return (ENOSYS);
}
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