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lvm2/lib/format_text/text_label.c
Alasdair G Kergon d591d04103 device: Tag I/O for each mda on a device separately in log messages.
Mark the first metadata area on each text format PV as MDA_PRIMARY.
Pass this information down to the device layer so that when
there are two metadata areas on a block device, we can easily
distinguish two independent streams of I/O.
2017-12-07 03:48:11 +00:00

496 lines
12 KiB
C

/*
* Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "lib.h"
#include "format-text.h"
#include "layout.h"
#include "label.h"
#include "xlate.h"
#include "lvmcache.h"
#include <sys/stat.h>
#include <fcntl.h>
static int _text_can_handle(struct labeller *l __attribute__((unused)),
void *buf,
uint64_t sector __attribute__((unused)))
{
struct label_header *lh = (struct label_header *) buf;
if (!strncmp((char *)lh->type, LVM2_LABEL, sizeof(lh->type)))
return 1;
return 0;
}
struct _dl_setup_baton {
struct disk_locn *pvh_dlocn_xl;
struct device *dev;
};
static int _da_setup(struct disk_locn *da, void *baton)
{
struct _dl_setup_baton *p = baton;
p->pvh_dlocn_xl->offset = xlate64(da->offset);
p->pvh_dlocn_xl->size = xlate64(da->size);
p->pvh_dlocn_xl++;
return 1;
}
static int _ba_setup(struct disk_locn *ba, void *baton)
{
return _da_setup(ba, baton);
}
static int _mda_setup(struct metadata_area *mda, void *baton)
{
struct _dl_setup_baton *p = baton;
struct mda_context *mdac = (struct mda_context *) mda->metadata_locn;
if (mdac->area.dev != p->dev)
return 1;
p->pvh_dlocn_xl->offset = xlate64(mdac->area.start);
p->pvh_dlocn_xl->size = xlate64(mdac->area.size);
p->pvh_dlocn_xl++;
return 1;
}
static int _dl_null_termination(void *baton)
{
struct _dl_setup_baton *p = baton;
p->pvh_dlocn_xl->offset = xlate64(UINT64_C(0));
p->pvh_dlocn_xl->size = xlate64(UINT64_C(0));
p->pvh_dlocn_xl++;
return 1;
}
static int _text_write(struct label *label, void *buf)
{
struct label_header *lh = (struct label_header *) buf;
struct pv_header *pvhdr;
struct pv_header_extension *pvhdr_ext;
struct lvmcache_info *info;
struct _dl_setup_baton baton;
char buffer[64] __attribute__((aligned(8)));
int ba1, da1, mda1, mda2;
/*
* PV header base
*/
/* FIXME Move to where label is created */
strncpy(label->type, LVM2_LABEL, sizeof(label->type));
strncpy((char *)lh->type, label->type, sizeof(label->type));
pvhdr = (struct pv_header *) ((char *) buf + xlate32(lh->offset_xl));
info = (struct lvmcache_info *) label->info;
pvhdr->device_size_xl = xlate64(lvmcache_device_size(info));
memcpy(pvhdr->pv_uuid, &lvmcache_device(info)->pvid, sizeof(struct id));
if (!id_write_format((const struct id *)pvhdr->pv_uuid, buffer,
sizeof(buffer))) {
stack;
buffer[0] = '\0';
}
baton.dev = lvmcache_device(info);
baton.pvh_dlocn_xl = &pvhdr->disk_areas_xl[0];
/* List of data areas (holding PEs) */
lvmcache_foreach_da(info, _da_setup, &baton);
_dl_null_termination(&baton);
/* List of metadata area header locations */
lvmcache_foreach_mda(info, _mda_setup, &baton);
_dl_null_termination(&baton);
/*
* PV header extension
*/
pvhdr_ext = (struct pv_header_extension *) ((char *) baton.pvh_dlocn_xl);
pvhdr_ext->version = xlate32(PV_HEADER_EXTENSION_VSN);
pvhdr_ext->flags = xlate32(lvmcache_ext_flags(info));
/* List of bootloader area locations */
baton.pvh_dlocn_xl = &pvhdr_ext->bootloader_areas_xl[0];
lvmcache_foreach_ba(info, _ba_setup, &baton);
_dl_null_termination(&baton);
/* Create debug message with ba, da and mda locations */
ba1 = (xlate64(pvhdr_ext->bootloader_areas_xl[0].offset) ||
xlate64(pvhdr_ext->bootloader_areas_xl[0].size)) ? 0 : -1;
da1 = (xlate64(pvhdr->disk_areas_xl[0].offset) ||
xlate64(pvhdr->disk_areas_xl[0].size)) ? 0 : -1;
mda1 = da1 + 2;
mda2 = mda1 + 1;
if (!xlate64(pvhdr->disk_areas_xl[mda1].offset) &&
!xlate64(pvhdr->disk_areas_xl[mda1].size))
mda1 = mda2 = 0;
else if (!xlate64(pvhdr->disk_areas_xl[mda2].offset) &&
!xlate64(pvhdr->disk_areas_xl[mda2].size))
mda2 = 0;
log_debug_metadata("%s: Preparing PV label header %s size %" PRIu64 " with"
"%s%.*" PRIu64 "%s%.*" PRIu64 "%s"
"%s%.*" PRIu64 "%s%.*" PRIu64 "%s"
"%s%.*" PRIu64 "%s%.*" PRIu64 "%s"
"%s%.*" PRIu64 "%s%.*" PRIu64 "%s",
dev_name(lvmcache_device(info)), buffer, lvmcache_device_size(info),
(ba1 > -1) ? " ba1 (" : "",
(ba1 > -1) ? 1 : 0,
(ba1 > -1) ? xlate64(pvhdr_ext->bootloader_areas_xl[ba1].offset) >> SECTOR_SHIFT : 0,
(ba1 > -1) ? "s, " : "",
(ba1 > -1) ? 1 : 0,
(ba1 > -1) ? xlate64(pvhdr_ext->bootloader_areas_xl[ba1].size) >> SECTOR_SHIFT : 0,
(ba1 > -1) ? "s)" : "",
(da1 > -1) ? " da1 (" : "",
(da1 > -1) ? 1 : 0,
(da1 > -1) ? xlate64(pvhdr->disk_areas_xl[da1].offset) >> SECTOR_SHIFT : 0,
(da1 > -1) ? "s, " : "",
(da1 > -1) ? 1 : 0,
(da1 > -1) ? xlate64(pvhdr->disk_areas_xl[da1].size) >> SECTOR_SHIFT : 0,
(da1 > -1) ? "s)" : "",
mda1 ? " mda1 (" : "",
mda1 ? 1 : 0,
mda1 ? xlate64(pvhdr->disk_areas_xl[mda1].offset) >> SECTOR_SHIFT : 0,
mda1 ? "s, " : "",
mda1 ? 1 : 0,
mda1 ? xlate64(pvhdr->disk_areas_xl[mda1].size) >> SECTOR_SHIFT : 0,
mda1 ? "s)" : "",
mda2 ? " mda2 (" : "",
mda2 ? 1 : 0,
mda2 ? xlate64(pvhdr->disk_areas_xl[mda2].offset) >> SECTOR_SHIFT : 0,
mda2 ? "s, " : "",
mda2 ? 1 : 0,
mda2 ? xlate64(pvhdr->disk_areas_xl[mda2].size) >> SECTOR_SHIFT : 0,
mda2 ? "s)" : "");
if (da1 < 0) {
log_error(INTERNAL_ERROR "%s label header currently requires "
"a data area.", dev_name(lvmcache_device(info)));
return 0;
}
return 1;
}
int add_da(struct dm_pool *mem, struct dm_list *das,
uint64_t start, uint64_t size)
{
struct data_area_list *dal;
if (!mem) {
if (!(dal = dm_malloc(sizeof(*dal)))) {
log_error("struct data_area_list allocation failed");
return 0;
}
} else {
if (!(dal = dm_pool_alloc(mem, sizeof(*dal)))) {
log_error("struct data_area_list allocation failed");
return 0;
}
}
dal->disk_locn.offset = start;
dal->disk_locn.size = size;
dm_list_add(das, &dal->list);
return 1;
}
void del_das(struct dm_list *das)
{
struct dm_list *dah, *tmp;
struct data_area_list *da;
dm_list_iterate_safe(dah, tmp, das) {
da = dm_list_item(dah, struct data_area_list);
dm_list_del(&da->list);
dm_free(da);
}
}
int add_ba(struct dm_pool *mem, struct dm_list *eas,
uint64_t start, uint64_t size)
{
return add_da(mem, eas, start, size);
}
void del_bas(struct dm_list *bas)
{
del_das(bas);
}
/* FIXME: refactor this function with other mda constructor code */
int add_mda(const struct format_type *fmt, struct dm_pool *mem, struct dm_list *mdas,
struct device *dev, uint64_t start, uint64_t size, unsigned ignored)
{
/* FIXME List size restricted by pv_header SECTOR_SIZE */
struct metadata_area *mdal, *mda;
struct mda_lists *mda_lists = (struct mda_lists *) fmt->private;
struct mda_context *mdac, *mdac2;
if (!mem) {
if (!(mdal = dm_malloc(sizeof(struct metadata_area)))) {
log_error("struct mda_list allocation failed");
return 0;
}
if (!(mdac = dm_malloc(sizeof(struct mda_context)))) {
log_error("struct mda_context allocation failed");
dm_free(mdal);
return 0;
}
} else {
if (!(mdal = dm_pool_alloc(mem, sizeof(struct metadata_area)))) {
log_error("struct mda_list allocation failed");
return 0;
}
if (!(mdac = dm_pool_alloc(mem, sizeof(struct mda_context)))) {
log_error("struct mda_context allocation failed");
return 0;
}
}
mdal->ops = mda_lists->raw_ops;
mdal->metadata_locn = mdac;
mdac->area.dev = dev;
mdac->area.start = start;
mdac->area.size = size;
mdac->free_sectors = UINT64_C(0);
memset(&mdac->rlocn, 0, sizeof(mdac->rlocn));
/* Set MDA_PRIMARY only if this is the first metadata area on this device. */
mdal->status = MDA_PRIMARY;
dm_list_iterate_items(mda, mdas) {
mdac2 = mda->metadata_locn;
if (mdac2->area.dev == dev) {
mdal->status = 0;
break;
}
}
mda_set_ignored(mdal, ignored);
dm_list_add(mdas, &mdal->list);
return 1;
}
void del_mdas(struct dm_list *mdas)
{
struct dm_list *mdah, *tmp;
struct metadata_area *mda;
dm_list_iterate_safe(mdah, tmp, mdas) {
mda = dm_list_item(mdah, struct metadata_area);
dm_free(mda->metadata_locn);
dm_list_del(&mda->list);
dm_free(mda);
}
}
static int _text_initialise_label(struct labeller *l __attribute__((unused)),
struct label *label)
{
strncpy(label->type, LVM2_LABEL, sizeof(label->type));
return 1;
}
struct _update_mda_baton {
struct lvmcache_info *info;
struct label *label;
};
static int _update_mda(struct metadata_area *mda, void *baton)
{
struct _update_mda_baton *p = baton;
const struct format_type *fmt = p->label->labeller->fmt;
struct mda_context *mdac = (struct mda_context *) mda->metadata_locn;
struct mda_header *mdah;
struct lvmcache_vgsummary vgsummary = { 0 };
/*
* Using the labeller struct to preserve info about
* the last parsed vgname, vgid, creation host
*
* TODO: make lvmcache smarter and move this cache logic there
*/
if (!dev_open_readonly(mdac->area.dev)) {
mda_set_ignored(mda, 1);
stack;
return 1;
}
if (!(mdah = raw_read_mda_header(fmt, &mdac->area, mda_is_primary(mda)))) {
stack;
goto close_dev;
}
mda_set_ignored(mda, rlocn_is_ignored(mdah->raw_locns));
if (mda_is_ignored(mda)) {
log_debug_metadata("Ignoring mda on device %s at offset %"PRIu64,
dev_name(mdac->area.dev),
mdac->area.start);
if (!dev_close(mdac->area.dev))
stack;
return 1;
}
if (vgname_from_mda(fmt, mdah, mda_is_primary(mda), &mdac->area, &vgsummary,
&mdac->free_sectors) &&
!lvmcache_update_vgname_and_id(p->info, &vgsummary)) {
if (!dev_close(mdac->area.dev))
stack;
return_0;
}
close_dev:
if (!dev_close(mdac->area.dev))
stack;
return 1;
}
static int _text_read(struct labeller *l, struct device *dev, void *buf,
struct label **label)
{
struct label_header *lh = (struct label_header *) buf;
struct pv_header *pvhdr;
struct pv_header_extension *pvhdr_ext;
struct lvmcache_info *info;
struct disk_locn *dlocn_xl;
uint64_t offset;
uint32_t ext_version;
struct _update_mda_baton baton;
/*
* PV header base
*/
pvhdr = (struct pv_header *) ((char *) buf + xlate32(lh->offset_xl));
if (!(info = lvmcache_add(l, (char *)pvhdr->pv_uuid, dev,
FMT_TEXT_ORPHAN_VG_NAME,
FMT_TEXT_ORPHAN_VG_NAME, 0)))
return_0;
*label = lvmcache_get_label(info);
lvmcache_set_device_size(info, xlate64(pvhdr->device_size_xl));
lvmcache_del_das(info);
lvmcache_del_mdas(info);
lvmcache_del_bas(info);
/* Data areas holding the PEs */
dlocn_xl = pvhdr->disk_areas_xl;
while ((offset = xlate64(dlocn_xl->offset))) {
lvmcache_add_da(info, offset, xlate64(dlocn_xl->size));
dlocn_xl++;
}
/* Metadata area headers */
dlocn_xl++;
while ((offset = xlate64(dlocn_xl->offset))) {
lvmcache_add_mda(info, dev, offset, xlate64(dlocn_xl->size), 0);
dlocn_xl++;
}
dlocn_xl++;
/*
* PV header extension
*/
pvhdr_ext = (struct pv_header_extension *) ((char *) dlocn_xl);
if (!(ext_version = xlate32(pvhdr_ext->version)))
goto out;
log_debug_metadata("%s: PV header extension version %" PRIu32 " found",
dev_name(dev), ext_version);
/* Extension version */
lvmcache_set_ext_version(info, xlate32(pvhdr_ext->version));
/* Extension flags */
lvmcache_set_ext_flags(info, xlate32(pvhdr_ext->flags));
/* Bootloader areas */
dlocn_xl = pvhdr_ext->bootloader_areas_xl;
while ((offset = xlate64(dlocn_xl->offset))) {
lvmcache_add_ba(info, offset, xlate64(dlocn_xl->size));
dlocn_xl++;
}
out:
baton.info = info;
baton.label = *label;
if (!lvmcache_foreach_mda(info, _update_mda, &baton))
return_0;
lvmcache_make_valid(info);
return 1;
}
static void _text_destroy_label(struct labeller *l __attribute__((unused)),
struct label *label)
{
struct lvmcache_info *info = (struct lvmcache_info *) label->info;
lvmcache_del_mdas(info);
lvmcache_del_das(info);
lvmcache_del_bas(info);
}
static void _fmt_text_destroy(struct labeller *l)
{
dm_free(l);
}
struct label_ops _text_ops = {
.can_handle = _text_can_handle,
.write = _text_write,
.read = _text_read,
.initialise_label = _text_initialise_label,
.destroy_label = _text_destroy_label,
.destroy = _fmt_text_destroy,
};
struct labeller *text_labeller_create(const struct format_type *fmt)
{
struct labeller *l;
if (!(l = dm_zalloc(sizeof(*l)))) {
log_error("Couldn't allocate labeller object.");
return NULL;
}
l->ops = &_text_ops;
l->fmt = fmt;
return l;
}