mirror of
git://sourceware.org/git/lvm2.git
synced 2024-12-21 13:34:40 +03:00
396 lines
9.0 KiB
C
396 lines
9.0 KiB
C
/*
|
|
* Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.
|
|
* Copyright (C) 2004-2007 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include "lib.h"
|
|
#include "label.h"
|
|
#include "crc.h"
|
|
#include "xlate.h"
|
|
#include "lvmcache.h"
|
|
#include "lvmetad.h"
|
|
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
|
|
/* FIXME Allow for larger labels? Restricted to single sector currently */
|
|
|
|
/*
|
|
* Internal labeller struct.
|
|
*/
|
|
struct labeller_i {
|
|
struct dm_list list;
|
|
|
|
struct labeller *l;
|
|
char name[0];
|
|
};
|
|
|
|
static struct dm_list _labellers;
|
|
|
|
static struct labeller_i *_alloc_li(const char *name, struct labeller *l)
|
|
{
|
|
struct labeller_i *li;
|
|
size_t len;
|
|
|
|
len = sizeof(*li) + strlen(name) + 1;
|
|
|
|
if (!(li = dm_malloc(len))) {
|
|
log_error("Couldn't allocate memory for labeller list object.");
|
|
return NULL;
|
|
}
|
|
|
|
li->l = l;
|
|
strcpy(li->name, name);
|
|
|
|
return li;
|
|
}
|
|
|
|
int label_init(void)
|
|
{
|
|
dm_list_init(&_labellers);
|
|
return 1;
|
|
}
|
|
|
|
void label_exit(void)
|
|
{
|
|
struct labeller_i *li, *tli;
|
|
|
|
dm_list_iterate_items_safe(li, tli, &_labellers) {
|
|
dm_list_del(&li->list);
|
|
li->l->ops->destroy(li->l);
|
|
dm_free(li);
|
|
}
|
|
|
|
dm_list_init(&_labellers);
|
|
}
|
|
|
|
int label_register_handler(struct labeller *handler)
|
|
{
|
|
struct labeller_i *li;
|
|
|
|
if (!(li = _alloc_li(handler->fmt->name, handler)))
|
|
return_0;
|
|
|
|
dm_list_add(&_labellers, &li->list);
|
|
return 1;
|
|
}
|
|
|
|
struct labeller *label_get_handler(const char *name)
|
|
{
|
|
struct labeller_i *li;
|
|
|
|
dm_list_iterate_items(li, &_labellers)
|
|
if (!strcmp(li->name, name))
|
|
return li->l;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void _update_lvmcache_orphan(struct lvmcache_info *info)
|
|
{
|
|
struct lvmcache_vgsummary vgsummary_orphan = {
|
|
.vgname = lvmcache_fmt(info)->orphan_vg_name,
|
|
};
|
|
|
|
memcpy(&vgsummary_orphan.vgid, lvmcache_fmt(info)->orphan_vg_name, strlen(lvmcache_fmt(info)->orphan_vg_name));
|
|
|
|
if (!lvmcache_update_vgname_and_id(info, &vgsummary_orphan))
|
|
stack;
|
|
}
|
|
|
|
static struct labeller *_find_labeller(struct device *dev, char *buf,
|
|
uint64_t *label_sector,
|
|
uint64_t scan_sector)
|
|
{
|
|
struct labeller_i *li;
|
|
struct labeller *r = NULL;
|
|
struct label_header *lh;
|
|
struct lvmcache_info *info;
|
|
uint64_t sector;
|
|
int found = 0;
|
|
char readbuf[LABEL_SCAN_SIZE] __attribute__((aligned(8)));
|
|
|
|
if (!dev_read(dev, scan_sector << SECTOR_SHIFT,
|
|
LABEL_SCAN_SIZE, readbuf)) {
|
|
log_debug_devs("%s: Failed to read label area", dev_name(dev));
|
|
goto out;
|
|
}
|
|
|
|
/* Scan a few sectors for a valid label */
|
|
for (sector = 0; sector < LABEL_SCAN_SECTORS;
|
|
sector += LABEL_SIZE >> SECTOR_SHIFT) {
|
|
lh = (struct label_header *) (readbuf +
|
|
(sector << SECTOR_SHIFT));
|
|
|
|
if (!strncmp((char *)lh->id, LABEL_ID, sizeof(lh->id))) {
|
|
if (found) {
|
|
log_error("Ignoring additional label on %s at "
|
|
"sector %" PRIu64, dev_name(dev),
|
|
sector + scan_sector);
|
|
}
|
|
if (xlate64(lh->sector_xl) != sector + scan_sector) {
|
|
log_info("%s: Label for sector %" PRIu64
|
|
" found at sector %" PRIu64
|
|
" - ignoring", dev_name(dev),
|
|
(uint64_t)xlate64(lh->sector_xl),
|
|
sector + scan_sector);
|
|
continue;
|
|
}
|
|
if (calc_crc(INITIAL_CRC, (uint8_t *)&lh->offset_xl, LABEL_SIZE -
|
|
((uint8_t *) &lh->offset_xl - (uint8_t *) lh)) !=
|
|
xlate32(lh->crc_xl)) {
|
|
log_info("Label checksum incorrect on %s - "
|
|
"ignoring", dev_name(dev));
|
|
continue;
|
|
}
|
|
if (found)
|
|
continue;
|
|
}
|
|
|
|
dm_list_iterate_items(li, &_labellers) {
|
|
if (li->l->ops->can_handle(li->l, (char *) lh,
|
|
sector + scan_sector)) {
|
|
log_very_verbose("%s: %s label detected at "
|
|
"sector %" PRIu64,
|
|
dev_name(dev), li->name,
|
|
sector + scan_sector);
|
|
if (found) {
|
|
log_error("Ignoring additional label "
|
|
"on %s at sector %" PRIu64,
|
|
dev_name(dev),
|
|
sector + scan_sector);
|
|
continue;
|
|
}
|
|
r = li->l;
|
|
memcpy(buf, lh, LABEL_SIZE);
|
|
if (label_sector)
|
|
*label_sector = sector + scan_sector;
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
out:
|
|
if (!found) {
|
|
if ((info = lvmcache_info_from_pvid(dev->pvid, 0)))
|
|
_update_lvmcache_orphan(info);
|
|
log_very_verbose("%s: No label detected", dev_name(dev));
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
/* FIXME Also wipe associated metadata area headers? */
|
|
int label_remove(struct device *dev)
|
|
{
|
|
char buf[LABEL_SIZE] __attribute__((aligned(8)));
|
|
char readbuf[LABEL_SCAN_SIZE] __attribute__((aligned(8)));
|
|
int r = 1;
|
|
uint64_t sector;
|
|
int wipe;
|
|
struct labeller_i *li;
|
|
struct label_header *lh;
|
|
|
|
memset(buf, 0, LABEL_SIZE);
|
|
|
|
log_very_verbose("Scanning for labels to wipe from %s", dev_name(dev));
|
|
|
|
if (!dev_open(dev))
|
|
return_0;
|
|
|
|
/*
|
|
* We flush the device just in case someone is stupid
|
|
* enough to be trying to import an open pv into lvm.
|
|
*/
|
|
dev_flush(dev);
|
|
|
|
if (!dev_read(dev, UINT64_C(0), LABEL_SCAN_SIZE, readbuf)) {
|
|
log_debug_devs("%s: Failed to read label area", dev_name(dev));
|
|
goto out;
|
|
}
|
|
|
|
/* Scan first few sectors for anything looking like a label */
|
|
for (sector = 0; sector < LABEL_SCAN_SECTORS;
|
|
sector += LABEL_SIZE >> SECTOR_SHIFT) {
|
|
lh = (struct label_header *) (readbuf +
|
|
(sector << SECTOR_SHIFT));
|
|
|
|
wipe = 0;
|
|
|
|
if (!strncmp((char *)lh->id, LABEL_ID, sizeof(lh->id))) {
|
|
if (xlate64(lh->sector_xl) == sector)
|
|
wipe = 1;
|
|
} else {
|
|
dm_list_iterate_items(li, &_labellers) {
|
|
if (li->l->ops->can_handle(li->l, (char *) lh,
|
|
sector)) {
|
|
wipe = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (wipe) {
|
|
log_info("%s: Wiping label at sector %" PRIu64,
|
|
dev_name(dev), sector);
|
|
if (!dev_write(dev, sector << SECTOR_SHIFT, LABEL_SIZE,
|
|
buf)) {
|
|
log_error("Failed to remove label from %s at "
|
|
"sector %" PRIu64, dev_name(dev),
|
|
sector);
|
|
r = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
out:
|
|
if (!dev_close(dev))
|
|
stack;
|
|
|
|
return r;
|
|
}
|
|
|
|
int label_read(struct device *dev, struct label **result,
|
|
uint64_t scan_sector)
|
|
{
|
|
char buf[LABEL_SIZE] __attribute__((aligned(8)));
|
|
struct labeller *l;
|
|
uint64_t sector;
|
|
struct lvmcache_info *info;
|
|
int r = 0;
|
|
|
|
if ((info = lvmcache_info_from_pvid(dev->pvid, 1))) {
|
|
log_debug_devs("Using cached label for %s", dev_name(dev));
|
|
*result = lvmcache_get_label(info);
|
|
return 1;
|
|
}
|
|
|
|
if (!dev_open_readonly(dev)) {
|
|
stack;
|
|
|
|
if ((info = lvmcache_info_from_pvid(dev->pvid, 0)))
|
|
_update_lvmcache_orphan(info);
|
|
|
|
return r;
|
|
}
|
|
|
|
if ((l = _find_labeller(dev, buf, §or, scan_sector)))
|
|
if ((r = (l->ops->read)(l, dev, buf, result)) && result && *result) {
|
|
(*result)->dev = dev;
|
|
(*result)->sector = sector;
|
|
}
|
|
|
|
if (!dev_close(dev))
|
|
stack;
|
|
|
|
return r;
|
|
}
|
|
|
|
/* Caller may need to use label_get_handler to create label struct! */
|
|
int label_write(struct device *dev, struct label *label)
|
|
{
|
|
char buf[LABEL_SIZE] __attribute__((aligned(8)));
|
|
struct label_header *lh = (struct label_header *) buf;
|
|
int r = 1;
|
|
|
|
if (!label->labeller->ops->write) {
|
|
log_error("Label handler does not support label writes");
|
|
return 0;
|
|
}
|
|
|
|
if ((LABEL_SIZE + (label->sector << SECTOR_SHIFT)) > LABEL_SCAN_SIZE) {
|
|
log_error("Label sector %" PRIu64 " beyond range (%ld)",
|
|
label->sector, LABEL_SCAN_SECTORS);
|
|
return 0;
|
|
}
|
|
|
|
memset(buf, 0, LABEL_SIZE);
|
|
|
|
strncpy((char *)lh->id, LABEL_ID, sizeof(lh->id));
|
|
lh->sector_xl = xlate64(label->sector);
|
|
lh->offset_xl = xlate32(sizeof(*lh));
|
|
|
|
if (!(label->labeller->ops->write)(label, buf))
|
|
return_0;
|
|
|
|
lh->crc_xl = xlate32(calc_crc(INITIAL_CRC, (uint8_t *)&lh->offset_xl, LABEL_SIZE -
|
|
((uint8_t *) &lh->offset_xl - (uint8_t *) lh)));
|
|
|
|
if (!dev_open(dev))
|
|
return_0;
|
|
|
|
log_info("%s: Writing label to sector %" PRIu64 " with stored offset %"
|
|
PRIu32 ".", dev_name(dev), label->sector,
|
|
xlate32(lh->offset_xl));
|
|
if (!dev_write(dev, label->sector << SECTOR_SHIFT, LABEL_SIZE, buf)) {
|
|
log_debug_devs("Failed to write label to %s", dev_name(dev));
|
|
r = 0;
|
|
}
|
|
|
|
if (!dev_close(dev))
|
|
stack;
|
|
|
|
return r;
|
|
}
|
|
|
|
/* Unused */
|
|
int label_verify(struct device *dev)
|
|
{
|
|
struct labeller *l;
|
|
char buf[LABEL_SIZE] __attribute__((aligned(8)));
|
|
uint64_t sector;
|
|
struct lvmcache_info *info;
|
|
int r = 0;
|
|
|
|
if (!dev_open_readonly(dev)) {
|
|
if ((info = lvmcache_info_from_pvid(dev->pvid, 0)))
|
|
_update_lvmcache_orphan(info);
|
|
return_0;
|
|
}
|
|
|
|
if (!(l = _find_labeller(dev, buf, §or, UINT64_C(0))))
|
|
goto out;
|
|
|
|
r = l->ops->verify ? l->ops->verify(l, buf, sector) : 1;
|
|
|
|
out:
|
|
if (!dev_close(dev))
|
|
stack;
|
|
|
|
return r;
|
|
}
|
|
|
|
void label_destroy(struct label *label)
|
|
{
|
|
label->labeller->ops->destroy_label(label->labeller, label);
|
|
dm_free(label);
|
|
}
|
|
|
|
struct label *label_create(struct labeller *labeller)
|
|
{
|
|
struct label *label;
|
|
|
|
if (!(label = dm_zalloc(sizeof(*label)))) {
|
|
log_error("label allocaction failed");
|
|
return NULL;
|
|
}
|
|
|
|
label->labeller = labeller;
|
|
|
|
labeller->ops->initialise_label(labeller, label);
|
|
|
|
return label;
|
|
}
|