mirror of
git://sourceware.org/git/lvm2.git
synced 2024-12-21 13:34:40 +03:00
c94d78f068
Fix clearing persistent filter state when clearing all the state from a label_scan. label_scan reads devs and saves info in bcache, lvmcache, and in the persistent filter. In some uncommon cases, an lvm command wants to clear all info from a prior label_scan, and repeat label_scan from scratch. In these cases, info in lvmcache, bcache and the persistent filter all need to be cleared before repeating label_scan. By missing the persistent filter wiping, outdated persistent filter info, from a prior label_scan, could cause lvm to incorrectly filter devices that change between polling intervals. (i.e. if the device changes in such a way that the filtering results change.) A case where lvm wants to do multiple label_scans is a polling command (like lvconvert --merge), when lvmpolld has been disabled, so that the command itself needs to to do repeated polling checks.
1765 lines
46 KiB
C
1765 lines
46 KiB
C
/*
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* Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "lib/misc/lib.h"
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#include "base/memory/zalloc.h"
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#include "lib/label/label.h"
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#include "lib/misc/crc.h"
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#include "lib/mm/xlate.h"
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#include "lib/cache/lvmcache.h"
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#include "lib/device/bcache.h"
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#include "lib/commands/toolcontext.h"
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#include "lib/activate/activate.h"
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#include "lib/label/hints.h"
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#include "lib/metadata/metadata.h"
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#include "lib/format_text/layout.h"
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/resource.h>
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/* FIXME Allow for larger labels? Restricted to single sector currently */
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static uint64_t _current_bcache_size_bytes;
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/*
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* Internal labeller struct.
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*/
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struct labeller_i {
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struct dm_list list;
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struct labeller *l;
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char name[];
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};
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static struct dm_list _labellers;
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static struct labeller_i *_alloc_li(const char *name, struct labeller *l)
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{
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struct labeller_i *li;
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size_t len;
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len = sizeof(*li) + strlen(name) + 1;
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if (!(li = malloc(len))) {
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log_error("Couldn't allocate memory for labeller list object.");
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return NULL;
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}
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li->l = l;
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strcpy(li->name, name);
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return li;
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}
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int label_init(void)
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{
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dm_list_init(&_labellers);
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return 1;
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}
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void label_exit(void)
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{
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struct labeller_i *li, *tli;
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dm_list_iterate_items_safe(li, tli, &_labellers) {
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dm_list_del(&li->list);
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li->l->ops->destroy(li->l);
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free(li);
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}
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dm_list_init(&_labellers);
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}
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int label_register_handler(struct labeller *handler)
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{
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struct labeller_i *li;
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if (!(li = _alloc_li(handler->fmt->name, handler)))
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return_0;
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dm_list_add(&_labellers, &li->list);
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return 1;
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}
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struct labeller *label_get_handler(const char *name)
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{
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struct labeller_i *li;
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dm_list_iterate_items(li, &_labellers)
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if (!strcmp(li->name, name))
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return li->l;
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return NULL;
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}
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/* FIXME Also wipe associated metadata area headers? */
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int label_remove(struct device *dev)
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{
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char readbuf[LABEL_SIZE] __attribute__((aligned(8)));
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int r = 1;
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uint64_t sector;
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int wipe;
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struct labeller_i *li;
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struct label_header *lh;
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struct lvmcache_info *info;
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log_very_verbose("Scanning for labels to wipe from %s", dev_name(dev));
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if (!label_scan_open_excl(dev)) {
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log_error("Failed to open device %s", dev_name(dev));
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return 0;
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}
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/* Scan first few sectors for anything looking like a label */
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for (sector = 0; sector < LABEL_SCAN_SECTORS;
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sector += LABEL_SIZE >> SECTOR_SHIFT) {
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memset(readbuf, 0, sizeof(readbuf));
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if (!dev_read_bytes(dev, sector << SECTOR_SHIFT, LABEL_SIZE, readbuf)) {
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log_error("Failed to read label from %s sector %llu",
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dev_name(dev), (unsigned long long)sector);
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continue;
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}
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lh = (struct label_header *)readbuf;
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wipe = 0;
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if (!memcmp(lh->id, LABEL_ID, sizeof(lh->id))) {
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if (xlate64(lh->sector_xl) == sector)
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wipe = 1;
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} else {
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dm_list_iterate_items(li, &_labellers) {
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if (li->l->ops->can_handle(li->l, (char *)lh, sector)) {
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wipe = 1;
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break;
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}
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}
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}
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if (wipe) {
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log_very_verbose("%s: Wiping label at sector %llu",
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dev_name(dev), (unsigned long long)sector);
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if (!dev_write_zeros(dev, sector << SECTOR_SHIFT, LABEL_SIZE)) {
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log_error("Failed to remove label from %s at sector %llu",
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dev_name(dev), (unsigned long long)sector);
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r = 0;
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} else {
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/* Also remove the PV record from cache. */
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info = lvmcache_info_from_pvid(dev->pvid, dev, 0);
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if (info)
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lvmcache_del(info);
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}
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}
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}
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return r;
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}
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/* Caller may need to use label_get_handler to create label struct! */
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int label_write(struct device *dev, struct label *label)
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{
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char buf[LABEL_SIZE] __attribute__((aligned(8)));
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struct label_header *lh = (struct label_header *) buf;
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uint64_t offset;
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int r = 1;
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if (!label->labeller->ops->write) {
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log_error("Label handler does not support label writes");
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return 0;
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}
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if ((LABEL_SIZE + (label->sector << SECTOR_SHIFT)) > LABEL_SCAN_SIZE) {
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log_error("Label sector %" PRIu64 " beyond range (%ld)",
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label->sector, LABEL_SCAN_SECTORS);
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return 0;
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}
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memset(buf, 0, LABEL_SIZE);
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memcpy(lh->id, LABEL_ID, sizeof(lh->id));
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lh->sector_xl = xlate64(label->sector);
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lh->offset_xl = xlate32(sizeof(*lh));
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if (!(label->labeller->ops->write)(label, buf))
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return_0;
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lh->crc_xl = xlate32(calc_crc(INITIAL_CRC, (uint8_t *)&lh->offset_xl, LABEL_SIZE -
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((uint8_t *) &lh->offset_xl - (uint8_t *) lh)));
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log_very_verbose("%s: Writing label to sector %" PRIu64 " with stored offset %"
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PRIu32 ".", dev_name(dev), label->sector,
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xlate32(lh->offset_xl));
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if (!label_scan_open(dev)) {
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log_error("Failed to open device %s", dev_name(dev));
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return 0;
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}
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offset = label->sector << SECTOR_SHIFT;
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dev_set_last_byte(dev, offset + LABEL_SIZE);
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if (!dev_write_bytes(dev, offset, LABEL_SIZE, buf)) {
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log_debug_devs("Failed to write label to %s", dev_name(dev));
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return 0;
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}
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dev_unset_last_byte(dev);
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return r;
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}
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void label_destroy(struct label *label)
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{
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label->labeller->ops->destroy_label(label->labeller, label);
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free(label);
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}
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struct label *label_create(struct labeller *labeller)
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{
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struct label *label;
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if (!(label = zalloc(sizeof(*label)))) {
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log_error("label allocaction failed");
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return NULL;
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}
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label->labeller = labeller;
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labeller->ops->initialise_label(labeller, label);
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return label;
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}
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/* global variable for accessing the bcache populated by label scan */
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struct bcache *scan_bcache;
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#define BCACHE_BLOCK_SIZE_IN_SECTORS 256 /* 256*512 = 128K */
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static bool _in_bcache(struct device *dev)
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{
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if (!dev)
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return NULL;
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return (dev->flags & DEV_IN_BCACHE) ? true : false;
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}
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static struct labeller *_find_lvm_header(struct device *dev,
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char *scan_buf,
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uint32_t scan_buf_sectors,
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char *label_buf,
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uint64_t *label_sector,
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uint64_t block_sector,
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uint64_t start_sector)
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{
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struct labeller_i *li;
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struct labeller *labeller_ret = NULL;
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struct label_header *lh;
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uint64_t sector;
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int found = 0;
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/*
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* Find which sector in scan_buf starts with a valid label,
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* and copy it into label_buf.
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*/
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for (sector = start_sector; sector < start_sector + LABEL_SCAN_SECTORS;
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sector += LABEL_SIZE >> SECTOR_SHIFT) {
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/*
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* The scan_buf passed in is a bcache block, which is
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* BCACHE_BLOCK_SIZE_IN_SECTORS large. So if start_sector is
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* one of the last couple sectors in that buffer, we need to
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* break early.
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*/
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if (sector >= scan_buf_sectors)
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break;
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lh = (struct label_header *) (scan_buf + (sector << SECTOR_SHIFT));
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if (!memcmp(lh->id, LABEL_ID, sizeof(lh->id))) {
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if (found) {
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log_error("Ignoring additional label on %s at sector %llu",
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dev_name(dev), (unsigned long long)(block_sector + sector));
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}
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if (xlate64(lh->sector_xl) != sector) {
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log_warn("%s: Label for sector %llu found at sector %llu - ignoring.",
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dev_name(dev),
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(unsigned long long)xlate64(lh->sector_xl),
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(unsigned long long)(block_sector + sector));
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continue;
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}
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if (calc_crc(INITIAL_CRC, (uint8_t *)&lh->offset_xl,
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LABEL_SIZE - ((uint8_t *) &lh->offset_xl - (uint8_t *) lh)) != xlate32(lh->crc_xl)) {
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log_very_verbose("Label checksum incorrect on %s - ignoring", dev_name(dev));
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continue;
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}
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if (found)
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continue;
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}
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dm_list_iterate_items(li, &_labellers) {
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if (li->l->ops->can_handle(li->l, (char *) lh, block_sector + sector)) {
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log_very_verbose("%s: %s label detected at sector %llu",
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dev_name(dev), li->name,
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(unsigned long long)(block_sector + sector));
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if (found) {
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log_error("Ignoring additional label on %s at sector %llu",
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dev_name(dev),
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(unsigned long long)(block_sector + sector));
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continue;
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}
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labeller_ret = li->l;
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found = 1;
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memcpy(label_buf, lh, LABEL_SIZE);
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if (label_sector)
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*label_sector = block_sector + sector;
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break;
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}
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}
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}
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return labeller_ret;
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}
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/*
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* Process/parse the headers from the data read from a device.
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* Populates lvmcache with device / mda locations / vgname
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* so that vg_read(vgname) will know which devices/locations
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* to read metadata from.
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*
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* If during processing, headers/metadata are found to be needed
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* beyond the range of the scanned block, then additional reads
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* are performed in the processing functions to get that data.
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*/
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static int _process_block(struct cmd_context *cmd, struct dev_filter *f,
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struct device *dev, struct block *bb,
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uint64_t block_sector, uint64_t start_sector,
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int *is_lvm_device)
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{
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char label_buf[LABEL_SIZE] __attribute__((aligned(8)));
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struct labeller *labeller;
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uint64_t sector = 0;
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int is_duplicate = 0;
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int ret = 0;
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dev->flags &= ~DEV_SCAN_FOUND_LABEL;
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/*
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* The device may have signatures that exclude it from being processed,
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* even if it might look like a PV. Now that the device has been read
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* and data is available in bcache for it, recheck filters, including
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* those that use data. The device needs to be excluded before it
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* begins to be processed as a PV.
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*/
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if (f) {
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if (!f->passes_filter(cmd, f, dev, NULL)) {
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/*
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* If this device was previously scanned (not common)
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* and if it passed filters at that point, lvmcache
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* info may have been saved for it. Now the same
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* device is being scanned again, and it may fail
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* filters this time. If the caller did not clear
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* lvmcache info for this dev before rescanning, do
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* that now. It's unlikely this is actually needed.
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*/
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if (dev->pvid[0]) {
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log_print("Clear pvid and info for filtered dev %s", dev_name(dev));
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lvmcache_del_dev(dev);
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memset(dev->pvid, 0, sizeof(dev->pvid));
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}
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*is_lvm_device = 0;
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goto_out;
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}
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}
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/*
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* Finds the data sector containing the label and copies into label_buf.
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* label_buf: struct label_header + struct pv_header + struct pv_header_extension
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*
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* FIXME: we don't need to copy one sector from bb->data into label_buf,
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* we can just point label_buf at one sector in ld->buf.
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*/
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if (!(labeller = _find_lvm_header(dev, bb->data, BCACHE_BLOCK_SIZE_IN_SECTORS, label_buf, §or, block_sector, start_sector))) {
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/*
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* Non-PVs exit here
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*
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* FIXME: check for PVs with errors that also exit here!
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* i.e. this code cannot distinguish between a non-lvm
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* device an an lvm device with errors.
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*/
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log_very_verbose("%s: No lvm label detected", dev_name(dev));
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/* See comment above */
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if (dev->pvid[0]) {
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log_print("Clear pvid and info for no lvm header %s", dev_name(dev));
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lvmcache_del_dev(dev);
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memset(dev->pvid, 0, sizeof(dev->pvid));
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}
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*is_lvm_device = 0;
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goto out;
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}
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dev->flags |= DEV_SCAN_FOUND_LABEL;
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*is_lvm_device = 1;
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/*
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* This is the point where the scanning code dives into the rest of
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* lvm. ops->read() is _text_read() which reads the pv_header, mda
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* locations, and metadata text. All of the info it finds about the PV
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* and VG is stashed in lvmcache which saves it in the form of
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* info/vginfo structs. That lvmcache info is used later when the
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* command wants to read the VG to do something to it.
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*/
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ret = labeller->ops->read(cmd, labeller, dev, label_buf, sector, &is_duplicate);
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if (!ret) {
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if (is_duplicate) {
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/*
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* _text_read() called lvmcache_add() which found an
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* existing info struct for this PVID but for a
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* different dev. lvmcache_add() did not add an info
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* struct for this dev, but added this dev to the list
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* of duplicate devs.
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*/
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log_debug("label scan found duplicate PVID %s on %s", dev->pvid, dev_name(dev));
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} else {
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/*
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* Leave the info in lvmcache because the device is
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* present and can still be used even if it has
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* metadata that we can't process (we can get metadata
|
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* from another PV/mda.) _text_read only saves mdas
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* with good metadata in lvmcache (this includes old
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* metadata), and if a PV has no mdas with good
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* metadata, then the info for the PV will be in
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* lvmcache with empty info->mdas, and it will behave
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* like a PV with no mdas (a common configuration.)
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*/
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log_warn("WARNING: scan failed to get metadata summary from %s PVID %s", dev_name(dev), dev->pvid);
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}
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}
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out:
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return ret;
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}
|
|
|
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static int _scan_dev_open(struct device *dev)
|
|
{
|
|
struct dm_list *name_list;
|
|
struct dm_str_list *name_sl;
|
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const char *name;
|
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const char *modestr;
|
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struct stat sbuf;
|
|
int retried = 0;
|
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int flags = 0;
|
|
int fd, di;
|
|
|
|
if (!dev)
|
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return 0;
|
|
|
|
if (dev->flags & DEV_IN_BCACHE) {
|
|
/* Shouldn't happen */
|
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log_error("Device open %s has DEV_IN_BCACHE already set", dev_name(dev));
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dev->flags &= ~DEV_IN_BCACHE;
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}
|
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|
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if (dev->bcache_di != -1) {
|
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/* Shouldn't happen */
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log_error("Device open %s already open with di %d fd %d",
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dev_name(dev), dev->bcache_di, dev->bcache_fd);
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return 0;
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}
|
|
|
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/*
|
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* All the names for this device (major:minor) are kept on
|
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* dev->aliases, the first one is the primary/preferred name.
|
|
*/
|
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if (!(name_list = dm_list_first(&dev->aliases))) {
|
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/* Shouldn't happen */
|
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log_error("Device open %s %d:%d has no path names.",
|
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dev_name(dev), (int)MAJOR(dev->dev), (int)MINOR(dev->dev));
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return 0;
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|
}
|
|
name_sl = dm_list_item(name_list, struct dm_str_list);
|
|
name = name_sl->str;
|
|
|
|
flags |= O_DIRECT;
|
|
flags |= O_NOATIME;
|
|
|
|
/*
|
|
* FIXME: udev is a train wreck when we open RDWR and close, so we
|
|
* need to only use RDWR when we actually need to write, and use
|
|
* RDONLY otherwise. Fix, disable or scrap udev nonsense so we can
|
|
* just open with RDWR by default.
|
|
*/
|
|
|
|
if (dev->flags & DEV_BCACHE_EXCL) {
|
|
flags |= O_EXCL;
|
|
flags |= O_RDWR;
|
|
modestr = "rwex";
|
|
} else if (dev->flags & DEV_BCACHE_WRITE) {
|
|
flags |= O_RDWR;
|
|
modestr = "rw";
|
|
} else {
|
|
flags |= O_RDONLY;
|
|
modestr = "ro";
|
|
}
|
|
|
|
retry_open:
|
|
|
|
fd = open(name, flags, 0777);
|
|
|
|
if (fd < 0) {
|
|
if ((errno == EBUSY) && (flags & O_EXCL)) {
|
|
log_error("Can't open %s exclusively. Mounted filesystem?",
|
|
dev_name(dev));
|
|
} else {
|
|
int major, minor;
|
|
|
|
/*
|
|
* Shouldn't happen, if it does, print stat info to help figure
|
|
* out what's wrong.
|
|
*/
|
|
|
|
major = (int)MAJOR(dev->dev);
|
|
minor = (int)MINOR(dev->dev);
|
|
|
|
log_error("Device open %s %d:%d failed errno %d", name, major, minor, errno);
|
|
|
|
if (stat(name, &sbuf)) {
|
|
log_debug_devs("Device open %s %d:%d stat failed errno %d",
|
|
name, major, minor, errno);
|
|
} else if (sbuf.st_rdev != dev->dev) {
|
|
log_debug_devs("Device open %s %d:%d stat %d:%d does not match.",
|
|
name, major, minor,
|
|
(int)MAJOR(sbuf.st_rdev), (int)MINOR(sbuf.st_rdev));
|
|
}
|
|
|
|
if (!retried) {
|
|
/*
|
|
* FIXME: remove this, the theory for this retry is that
|
|
* there may be a udev race that we can sometimes mask by
|
|
* retrying. This is here until we can figure out if it's
|
|
* needed and if so fix the real problem.
|
|
*/
|
|
usleep(5000);
|
|
log_debug_devs("Device open %s retry", dev_name(dev));
|
|
retried = 1;
|
|
goto retry_open;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
dev->flags |= DEV_IN_BCACHE;
|
|
dev->bcache_fd = fd;
|
|
|
|
di = bcache_set_fd(fd);
|
|
|
|
if (di == -1) {
|
|
log_error("Failed to set bcache fd.");
|
|
close(fd);
|
|
dev->bcache_fd = -1;
|
|
return 0;
|
|
}
|
|
|
|
log_debug("open %s %s di %d fd %d", dev_name(dev), modestr, di, fd);
|
|
|
|
dev->bcache_di = di;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _scan_dev_close(struct device *dev)
|
|
{
|
|
if (!(dev->flags & DEV_IN_BCACHE))
|
|
log_error("scan_dev_close %s no DEV_IN_BCACHE set", dev_name(dev));
|
|
|
|
dev->flags &= ~DEV_IN_BCACHE;
|
|
dev->flags &= ~DEV_BCACHE_EXCL;
|
|
dev->flags &= ~DEV_BCACHE_WRITE;
|
|
|
|
if (dev->bcache_di == -1) {
|
|
log_error("scan_dev_close %s already closed", dev_name(dev));
|
|
return 0;
|
|
}
|
|
|
|
bcache_clear_fd(dev->bcache_di);
|
|
|
|
if (close(dev->bcache_fd))
|
|
log_warn("close %s errno %d", dev_name(dev), errno);
|
|
|
|
dev->bcache_fd = -1;
|
|
dev->bcache_di = -1;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void _drop_bad_aliases(struct device *dev)
|
|
{
|
|
struct dm_str_list *strl, *strl2;
|
|
const char *name;
|
|
struct stat sbuf;
|
|
int major = (int)MAJOR(dev->dev);
|
|
int minor = (int)MINOR(dev->dev);
|
|
int bad;
|
|
|
|
dm_list_iterate_items_safe(strl, strl2, &dev->aliases) {
|
|
name = strl->str;
|
|
bad = 0;
|
|
|
|
if (stat(name, &sbuf)) {
|
|
bad = 1;
|
|
log_debug_devs("Device path check %d:%d %s stat failed errno %d",
|
|
major, minor, name, errno);
|
|
} else if (sbuf.st_rdev != dev->dev) {
|
|
bad = 1;
|
|
log_debug_devs("Device path check %d:%d %s stat %d:%d does not match.",
|
|
major, minor, name,
|
|
(int)MAJOR(sbuf.st_rdev), (int)MINOR(sbuf.st_rdev));
|
|
}
|
|
|
|
if (bad) {
|
|
log_debug_devs("Device path check %d:%d dropping path %s.", major, minor, name);
|
|
dev_cache_failed_path(dev, name);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Like bcache_invalidate, only it throws any dirty data away if the
|
|
// write fails.
|
|
static void _invalidate_di(struct bcache *cache, int di)
|
|
{
|
|
if (!bcache_invalidate_di(cache, di))
|
|
bcache_abort_di(cache, di);
|
|
}
|
|
|
|
/*
|
|
* Read or reread label/metadata from selected devs.
|
|
*
|
|
* Reads and looks at label_header, pv_header, pv_header_extension,
|
|
* mda_header, raw_locns, vg metadata from each device.
|
|
*
|
|
* Effect is populating lvmcache with latest info/vginfo (PV/VG) data
|
|
* from the devs. If a scanned device does not have a label_header,
|
|
* its info is removed from lvmcache.
|
|
*/
|
|
|
|
static int _scan_list(struct cmd_context *cmd, struct dev_filter *f,
|
|
struct dm_list *devs, int want_other_devs, int *failed)
|
|
{
|
|
struct dm_list wait_devs;
|
|
struct dm_list done_devs;
|
|
struct dm_list reopen_devs;
|
|
struct device_list *devl, *devl2;
|
|
struct block *bb;
|
|
int retried_open = 0;
|
|
int scan_read_errors = 0;
|
|
int scan_process_errors = 0;
|
|
int scan_failed_count = 0;
|
|
int rem_prefetches;
|
|
int submit_count;
|
|
int is_lvm_device;
|
|
int ret;
|
|
|
|
dm_list_init(&wait_devs);
|
|
dm_list_init(&done_devs);
|
|
dm_list_init(&reopen_devs);
|
|
|
|
log_debug_devs("Scanning %d devices for VG info", dm_list_size(devs));
|
|
|
|
scan_more:
|
|
rem_prefetches = bcache_max_prefetches(scan_bcache);
|
|
submit_count = 0;
|
|
|
|
dm_list_iterate_items_safe(devl, devl2, devs) {
|
|
|
|
/*
|
|
* If we prefetch more devs than blocks in the cache, then the
|
|
* cache will wait for earlier reads to complete, toss the
|
|
* results, and reuse those blocks before we've had a chance to
|
|
* use them. So, prefetch as many as are available, wait for
|
|
* and process them, then repeat.
|
|
*/
|
|
if (!rem_prefetches)
|
|
break;
|
|
|
|
if (!_in_bcache(devl->dev)) {
|
|
if (!_scan_dev_open(devl->dev)) {
|
|
log_debug_devs("Scan failed to open %s.", dev_name(devl->dev));
|
|
dm_list_del(&devl->list);
|
|
dm_list_add(&reopen_devs, &devl->list);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
bcache_prefetch(scan_bcache, devl->dev->bcache_di, 0);
|
|
|
|
rem_prefetches--;
|
|
submit_count++;
|
|
|
|
dm_list_del(&devl->list);
|
|
dm_list_add(&wait_devs, &devl->list);
|
|
}
|
|
|
|
log_debug_devs("Scanning submitted %d reads", submit_count);
|
|
|
|
dm_list_iterate_items_safe(devl, devl2, &wait_devs) {
|
|
bb = NULL;
|
|
is_lvm_device = 0;
|
|
|
|
if (!bcache_get(scan_bcache, devl->dev->bcache_di, 0, 0, &bb)) {
|
|
log_debug_devs("Scan failed to read %s.", dev_name(devl->dev));
|
|
scan_read_errors++;
|
|
scan_failed_count++;
|
|
lvmcache_del_dev(devl->dev);
|
|
} else {
|
|
log_debug_devs("Processing data from device %s %d:%d di %d block %p",
|
|
dev_name(devl->dev),
|
|
(int)MAJOR(devl->dev->dev),
|
|
(int)MINOR(devl->dev->dev),
|
|
devl->dev->bcache_di, (void *)bb);
|
|
|
|
ret = _process_block(cmd, f, devl->dev, bb, 0, 0, &is_lvm_device);
|
|
|
|
if (!ret && is_lvm_device) {
|
|
log_debug_devs("Scan failed to process %s", dev_name(devl->dev));
|
|
scan_process_errors++;
|
|
scan_failed_count++;
|
|
}
|
|
}
|
|
|
|
if (bb)
|
|
bcache_put(bb);
|
|
|
|
/*
|
|
* Keep the bcache block of lvm devices we have processed so
|
|
* that the vg_read phase can reuse it. If bcache failed to
|
|
* read the block, or the device does not belong to lvm, then
|
|
* drop it from bcache. When "want_other_devs" is set, it
|
|
* means the caller wants to scan and keep open non-lvm devs,
|
|
* e.g. to pvcreate them.
|
|
*/
|
|
if (!is_lvm_device && !want_other_devs) {
|
|
_invalidate_di(scan_bcache, devl->dev->bcache_di);
|
|
_scan_dev_close(devl->dev);
|
|
}
|
|
|
|
dm_list_del(&devl->list);
|
|
dm_list_add(&done_devs, &devl->list);
|
|
}
|
|
|
|
if (!dm_list_empty(devs))
|
|
goto scan_more;
|
|
|
|
/*
|
|
* We're done scanning all the devs. If we failed to open any of them
|
|
* the first time through, refresh device paths and retry. We failed
|
|
* to open the devs on the reopen_devs list.
|
|
*
|
|
* FIXME: it's not clear if or why this helps.
|
|
*/
|
|
if (!dm_list_empty(&reopen_devs)) {
|
|
if (retried_open) {
|
|
/* Don't try again. */
|
|
scan_failed_count += dm_list_size(&reopen_devs);
|
|
dm_list_splice(&done_devs, &reopen_devs);
|
|
goto out;
|
|
}
|
|
retried_open = 1;
|
|
|
|
dm_list_iterate_items_safe(devl, devl2, &reopen_devs) {
|
|
_drop_bad_aliases(devl->dev);
|
|
|
|
if (dm_list_empty(&devl->dev->aliases)) {
|
|
log_warn("WARNING: Scan ignoring device %d:%d with no paths.",
|
|
(int)MAJOR(devl->dev->dev),
|
|
(int)MINOR(devl->dev->dev));
|
|
|
|
dm_list_del(&devl->list);
|
|
lvmcache_del_dev(devl->dev);
|
|
scan_failed_count++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This will search the system's /dev for new path names and
|
|
* could help us reopen the device if it finds a new preferred
|
|
* path name for this dev's major:minor. It does that by
|
|
* inserting a new preferred path name on dev->aliases. open
|
|
* uses the first name from that list.
|
|
*/
|
|
log_debug_devs("Scanning refreshing device paths.");
|
|
dev_cache_scan();
|
|
|
|
/* Put devs that failed to open back on the original list to retry. */
|
|
dm_list_splice(devs, &reopen_devs);
|
|
goto scan_more;
|
|
}
|
|
out:
|
|
log_debug_devs("Scanned devices: read errors %d process errors %d failed %d",
|
|
scan_read_errors, scan_process_errors, scan_failed_count);
|
|
|
|
if (failed)
|
|
*failed = scan_failed_count;
|
|
|
|
dm_list_splice(devs, &done_devs);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* We don't know ahead of time if we will find some VG metadata
|
|
* that is larger than the total size of the bcache, which would
|
|
* prevent us from reading/writing the VG since we do not dynamically
|
|
* increase the bcache size when we find it's too small. In these
|
|
* cases the user would need to set io_memory_size to be larger
|
|
* than the max VG metadata size (lvm does not impose any limit on
|
|
* the metadata size.)
|
|
*/
|
|
|
|
#define MIN_BCACHE_BLOCKS 32 /* 4MB (32 * 128KB) */
|
|
#define MAX_BCACHE_BLOCKS 4096 /* 512MB (4096 * 128KB) */
|
|
|
|
static int _setup_bcache(void)
|
|
{
|
|
struct io_engine *ioe = NULL;
|
|
int iomem_kb = io_memory_size();
|
|
int block_size_kb = (BCACHE_BLOCK_SIZE_IN_SECTORS * 512) / 1024;
|
|
int cache_blocks;
|
|
|
|
cache_blocks = iomem_kb / block_size_kb;
|
|
|
|
if (cache_blocks < MIN_BCACHE_BLOCKS)
|
|
cache_blocks = MIN_BCACHE_BLOCKS;
|
|
|
|
if (cache_blocks > MAX_BCACHE_BLOCKS)
|
|
cache_blocks = MAX_BCACHE_BLOCKS;
|
|
|
|
_current_bcache_size_bytes = cache_blocks * BCACHE_BLOCK_SIZE_IN_SECTORS * 512;
|
|
|
|
if (use_aio()) {
|
|
if (!(ioe = create_async_io_engine())) {
|
|
log_warn("Failed to set up async io, using sync io.");
|
|
init_use_aio(0);
|
|
}
|
|
}
|
|
|
|
if (!ioe) {
|
|
if (!(ioe = create_sync_io_engine())) {
|
|
log_error("Failed to set up sync io.");
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (!(scan_bcache = bcache_create(BCACHE_BLOCK_SIZE_IN_SECTORS, cache_blocks, ioe))) {
|
|
log_error("Failed to create bcache with %d cache blocks.", cache_blocks);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* We don't know how many of num_devs will be PVs that we need to
|
|
* keep open, but if it's greater than the soft limit, then we'll
|
|
* need the soft limit raised, so do that before starting.
|
|
*
|
|
* If opens approach the raised soft/hard limit while scanning, then
|
|
* we could also attempt to raise the soft/hard limits during the scan.
|
|
*/
|
|
|
|
#define BASE_FD_COUNT 32 /* Number of open files we want apart from devs */
|
|
|
|
static void _prepare_open_file_limit(struct cmd_context *cmd, unsigned int num_devs)
|
|
{
|
|
#ifdef HAVE_PRLIMIT
|
|
struct rlimit old, new;
|
|
unsigned int want = num_devs + BASE_FD_COUNT;
|
|
int rv;
|
|
|
|
rv = prlimit(0, RLIMIT_NOFILE, NULL, &old);
|
|
if (rv < 0) {
|
|
log_debug("Checking fd limit for num_devs %u failed %d", num_devs, errno);
|
|
return;
|
|
}
|
|
|
|
log_debug("Checking fd limit for num_devs %u want %u soft %lld hard %lld",
|
|
num_devs, want, (long long)old.rlim_cur, (long long)old.rlim_max);
|
|
|
|
/* Current soft limit is enough */
|
|
if (old.rlim_cur > want)
|
|
return;
|
|
|
|
/* Soft limit already raised to max */
|
|
if (old.rlim_cur == old.rlim_max)
|
|
return;
|
|
|
|
/* Raise soft limit up to hard/max limit */
|
|
new.rlim_cur = old.rlim_max;
|
|
new.rlim_max = old.rlim_max;
|
|
|
|
log_debug("Setting fd limit for num_devs %u soft %lld hard %lld",
|
|
num_devs, (long long)new.rlim_cur, (long long)new.rlim_max);
|
|
|
|
rv = prlimit(0, RLIMIT_NOFILE, &new, &old);
|
|
if (rv < 0) {
|
|
if (errno == EPERM)
|
|
log_warn("WARNING: permission error setting open file limit for scanning %u devices.", num_devs);
|
|
else
|
|
log_warn("WARNING: cannot set open file limit for scanning %u devices.", num_devs);
|
|
return;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
int label_scan_for_pvid(struct cmd_context *cmd, char *pvid, struct device **dev_out)
|
|
{
|
|
char buf[LABEL_SIZE] __attribute__((aligned(8)));
|
|
struct dm_list devs;
|
|
struct dev_iter *iter;
|
|
struct device_list *devl, *devl2;
|
|
struct device *dev;
|
|
struct pv_header *pvh;
|
|
int ret = 0;
|
|
|
|
dm_list_init(&devs);
|
|
|
|
dev_cache_scan();
|
|
|
|
if (!(iter = dev_iter_create(cmd->filter, 0))) {
|
|
log_error("Scanning failed to get devices.");
|
|
return 0;
|
|
}
|
|
|
|
log_debug_devs("Filtering devices to scan");
|
|
|
|
while ((dev = dev_iter_get(cmd, iter))) {
|
|
if (!(devl = zalloc(sizeof(*devl))))
|
|
continue;
|
|
devl->dev = dev;
|
|
dm_list_add(&devs, &devl->list);
|
|
};
|
|
dev_iter_destroy(iter);
|
|
|
|
if (!scan_bcache) {
|
|
if (!_setup_bcache())
|
|
goto_out;
|
|
}
|
|
|
|
log_debug_devs("Reading labels for pvid");
|
|
|
|
dm_list_iterate_items(devl, &devs) {
|
|
dev = devl->dev;
|
|
|
|
memset(buf, 0, sizeof(buf));
|
|
|
|
if (!label_scan_open(dev))
|
|
continue;
|
|
|
|
if (!dev_read_bytes(dev, 512, LABEL_SIZE, buf)) {
|
|
_scan_dev_close(dev);
|
|
goto out;
|
|
}
|
|
|
|
pvh = (struct pv_header *)(buf + 32);
|
|
|
|
if (!memcmp(pvh->pv_uuid, pvid, ID_LEN)) {
|
|
*dev_out = devl->dev;
|
|
_scan_dev_close(dev);
|
|
break;
|
|
}
|
|
|
|
_scan_dev_close(dev);
|
|
}
|
|
ret = 1;
|
|
out:
|
|
dm_list_iterate_items_safe(devl, devl2, &devs) {
|
|
dm_list_del(&devl->list);
|
|
free(devl);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Scan devices on the system to discover which are LVM devices.
|
|
* Info about the LVM devices (PVs) is saved in lvmcache in a
|
|
* basic/summary form (info/vginfo structs). The vg_read phase
|
|
* uses this summary info to know which PVs to look at for
|
|
* processing a given VG.
|
|
*/
|
|
|
|
int label_scan(struct cmd_context *cmd)
|
|
{
|
|
struct dm_list all_devs;
|
|
struct dm_list filtered_devs;
|
|
struct dm_list scan_devs;
|
|
struct dm_list hints_list;
|
|
struct dev_iter *iter;
|
|
struct device_list *devl, *devl2;
|
|
struct device *dev;
|
|
uint64_t max_metadata_size_bytes;
|
|
int using_hints;
|
|
int create_hints = 0; /* NEWHINTS_NONE */
|
|
|
|
log_debug_devs("Finding devices to scan");
|
|
|
|
dm_list_init(&all_devs);
|
|
dm_list_init(&filtered_devs);
|
|
dm_list_init(&scan_devs);
|
|
dm_list_init(&hints_list);
|
|
|
|
if (!scan_bcache) {
|
|
if (!_setup_bcache())
|
|
return_0;
|
|
}
|
|
|
|
/*
|
|
* dev_cache_scan() creates a list of devices on the system
|
|
* (saved in in dev-cache) which we can iterate through to
|
|
* search for LVM devs. The dev cache list either comes from
|
|
* looking at dev nodes under /dev, or from udev.
|
|
*/
|
|
dev_cache_scan();
|
|
|
|
/*
|
|
* If we know that there will be md components with an end
|
|
* superblock, then enable the full md filter before label
|
|
* scan begins. FIXME: we could skip the full md check on
|
|
* devs that are not identified as PVs, but then we'd need
|
|
* to do something other than using the standard md filter.
|
|
*/
|
|
if (cmd->md_component_detection && !cmd->use_full_md_check &&
|
|
!strcmp(cmd->md_component_checks, "auto") &&
|
|
dev_cache_has_md_with_end_superblock(cmd->dev_types)) {
|
|
log_debug("Enable full md component check.");
|
|
cmd->use_full_md_check = 1;
|
|
}
|
|
|
|
/*
|
|
* Create a list of all devices in dev-cache (all found on the system.)
|
|
* Do not apply filters and do not read any (the filter arg is NULL).
|
|
* Invalidate bcache data for all devs (there will usually be no bcache
|
|
* data to invalidate.)
|
|
*/
|
|
if (!(iter = dev_iter_create(NULL, 0))) {
|
|
log_error("Scanning failed to get devices.");
|
|
return 0;
|
|
}
|
|
while ((dev = dev_iter_get(cmd, iter))) {
|
|
if (!(devl = zalloc(sizeof(*devl))))
|
|
continue;
|
|
devl->dev = dev;
|
|
dm_list_add(&all_devs, &devl->list);
|
|
|
|
/*
|
|
* label_scan should not generally be called a second time,
|
|
* so this will usually do nothing.
|
|
*/
|
|
label_scan_invalidate(dev);
|
|
};
|
|
dev_iter_destroy(iter);
|
|
|
|
/*
|
|
* Exclude devices that fail nodata filters. (Those filters that can be
|
|
* checked without reading data from the device.)
|
|
*
|
|
* The result of checking nodata filters is saved by the "persistent
|
|
* filter", and this result needs to be cleared (wiped) so that the
|
|
* complete set of filters (including those that require data) can be
|
|
* checked in _process_block, where headers have been read.
|
|
*/
|
|
log_debug_devs("Filtering devices to scan (nodata)");
|
|
|
|
cmd->filter_nodata_only = 1;
|
|
dm_list_iterate_items_safe(devl, devl2, &all_devs) {
|
|
dev = devl->dev;
|
|
if (!cmd->filter->passes_filter(cmd, cmd->filter, dev, NULL)) {
|
|
dm_list_del(&devl->list);
|
|
dm_list_add(&filtered_devs, &devl->list);
|
|
|
|
if (dev->pvid[0]) {
|
|
log_print("Clear pvid and info for filtered dev %s", dev_name(dev));
|
|
lvmcache_del_dev(dev);
|
|
memset(dev->pvid, 0, sizeof(dev->pvid));
|
|
}
|
|
}
|
|
}
|
|
cmd->filter_nodata_only = 0;
|
|
|
|
dm_list_iterate_items(devl, &all_devs)
|
|
cmd->filter->wipe(cmd, cmd->filter, devl->dev, NULL);
|
|
dm_list_iterate_items(devl, &filtered_devs)
|
|
cmd->filter->wipe(cmd, cmd->filter, devl->dev, NULL);
|
|
|
|
/*
|
|
* In some common cases we can avoid scanning all devices
|
|
* by using hints which tell us which devices are PVs, which
|
|
* are the only devices we actually need to scan. Without
|
|
* hints we need to scan all devs to find which are PVs.
|
|
*
|
|
* TODO: if the command is using hints and a single vgname
|
|
* arg, we can also take the vg lock here, prior to scanning.
|
|
* This means we would not need to rescan the PVs in the VG
|
|
* in vg_read (skip lvmcache_label_rescan_vg) after the
|
|
* vg lock is usually taken. (Some commands are already
|
|
* able to avoid rescan in vg_read, but locking early would
|
|
* apply to more cases.)
|
|
*/
|
|
if (!get_hints(cmd, &hints_list, &create_hints, &all_devs, &scan_devs)) {
|
|
dm_list_splice(&scan_devs, &all_devs);
|
|
dm_list_init(&hints_list);
|
|
using_hints = 0;
|
|
} else
|
|
using_hints = 1;
|
|
|
|
/*
|
|
* If the total number of devices exceeds the soft open file
|
|
* limit, then increase the soft limit to the hard/max limit
|
|
* in case the number of PVs in scan_devs (it's only the PVs
|
|
* which we want to keep open) is higher than the current
|
|
* soft limit.
|
|
*/
|
|
_prepare_open_file_limit(cmd, dm_list_size(&scan_devs));
|
|
|
|
/*
|
|
* Do the main scan.
|
|
*/
|
|
_scan_list(cmd, cmd->filter, &scan_devs, 0, NULL);
|
|
|
|
/*
|
|
* Metadata could be larger than total size of bcache, and bcache
|
|
* cannot currently be resized during the command. If this is the
|
|
* case (or within reach), warn that io_memory_size needs to be
|
|
* set larger.
|
|
*
|
|
* Even if bcache out of space did not cause a failure during scan, it
|
|
* may cause a failure during the next vg_read phase or during vg_write.
|
|
*
|
|
* If there was an error during scan, we could recreate bcache here
|
|
* with a larger size and then restart label_scan. But, this does not
|
|
* address the problem of writing new metadata that excedes the bcache
|
|
* size and failing, which would often be hit first, i.e. we'll fail
|
|
* to write new metadata exceding the max size before we have a chance
|
|
* to read any metadata with that size, unless we find an existing vg
|
|
* that has been previously created with the larger size.
|
|
*
|
|
* If the largest metadata is within 1MB of the bcache size, then start
|
|
* warning.
|
|
*/
|
|
max_metadata_size_bytes = lvmcache_max_metadata_size();
|
|
|
|
if (max_metadata_size_bytes + (1024 * 1024) > _current_bcache_size_bytes) {
|
|
/* we want bcache to be 1MB larger than the max metadata seen */
|
|
uint64_t want_size_kb = (max_metadata_size_bytes / 1024) + 1024;
|
|
uint64_t remainder;
|
|
if ((remainder = (want_size_kb % 1024)))
|
|
want_size_kb = want_size_kb + 1024 - remainder;
|
|
|
|
log_warn("WARNING: metadata may not be usable with current io_memory_size %d KiB",
|
|
io_memory_size());
|
|
log_warn("WARNING: increase lvm.conf io_memory_size to at least %llu KiB",
|
|
(unsigned long long)want_size_kb);
|
|
}
|
|
|
|
dm_list_init(&cmd->hints);
|
|
|
|
/*
|
|
* If we're using hints to limit which devs we scanned, verify
|
|
* that those hints were valid, and if not we need to scan the
|
|
* rest of the devs.
|
|
*/
|
|
if (using_hints) {
|
|
if (!validate_hints(cmd, &hints_list)) {
|
|
log_debug("Will scan %d remaining devices", dm_list_size(&all_devs));
|
|
_scan_list(cmd, cmd->filter, &all_devs, 0, NULL);
|
|
free_hints(&hints_list);
|
|
using_hints = 0;
|
|
create_hints = 0;
|
|
} else {
|
|
/* The hints may be used by another device iteration. */
|
|
dm_list_splice(&cmd->hints, &hints_list);
|
|
}
|
|
}
|
|
|
|
dm_list_iterate_items_safe(devl, devl2, &all_devs) {
|
|
dm_list_del(&devl->list);
|
|
free(devl);
|
|
}
|
|
|
|
dm_list_iterate_items_safe(devl, devl2, &scan_devs) {
|
|
dm_list_del(&devl->list);
|
|
free(devl);
|
|
}
|
|
|
|
dm_list_iterate_items_safe(devl, devl2, &filtered_devs) {
|
|
dm_list_del(&devl->list);
|
|
free(devl);
|
|
}
|
|
|
|
/*
|
|
* Look for md components that might have been missed by filter-md
|
|
* during the scan. With the label scanning complete we have metadata
|
|
* available that can sometimes offer a clue that a dev is actually an
|
|
* md component (device name hint, pv size vs dev size). In some of
|
|
* those cases we may want to do a full md check on a dev that has been
|
|
* scanned. This is done before hints are written so that any devs
|
|
* dropped due to being md components will not be included in a new
|
|
* hint file.
|
|
*/
|
|
lvmcache_extra_md_component_checks(cmd);
|
|
|
|
/*
|
|
* If hints were not available/usable, then we scanned all devs,
|
|
* and we now know which are PVs. Save this list of PVs we've
|
|
* identified as hints for the next command to use.
|
|
* (create_hints variable has NEWHINTS_X value which indicates
|
|
* the reason for creating the new hints.)
|
|
*/
|
|
if (create_hints)
|
|
write_hint_file(cmd, create_hints);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Read the header of the disk and if it's a PV
|
|
* save the pvid in dev->pvid.
|
|
*/
|
|
int label_read_pvid(struct device *dev)
|
|
{
|
|
char buf[4096] __attribute__((aligned(8)));
|
|
struct label_header *lh;
|
|
struct pv_header *pvh;
|
|
|
|
memset(buf, 0, sizeof(buf));
|
|
|
|
if (!label_scan_open(dev))
|
|
return_0;
|
|
|
|
/*
|
|
* We could do:
|
|
* dev_read_bytes(dev, 512, LABEL_SIZE, buf);
|
|
* which works, but there's a bcache issue that
|
|
* prevents proper invalidation after that.
|
|
*/
|
|
if (!dev_read_bytes(dev, 0, 4096, buf)) {
|
|
label_scan_invalidate(dev);
|
|
return 0;
|
|
}
|
|
|
|
lh = (struct label_header *)(buf + 512);
|
|
if (memcmp(lh->id, LABEL_ID, sizeof(lh->id))) {
|
|
/* Not an lvm deice */
|
|
label_scan_invalidate(dev);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* wipefs -a just clears the type field, leaving the
|
|
* rest of the label_header intact.
|
|
*/
|
|
if (memcmp(lh->type, LVM2_LABEL, sizeof(lh->type))) {
|
|
/* Not an lvm deice */
|
|
label_scan_invalidate(dev);
|
|
return 0;
|
|
}
|
|
|
|
pvh = (struct pv_header *)(buf + 512 + 32);
|
|
memcpy(dev->pvid, pvh->pv_uuid, ID_LEN);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* label_scan_devs without invalidating data for the devs first,
|
|
* when the caller wants to make use of any bcache data that
|
|
* they may have already read.
|
|
*/
|
|
int label_scan_devs_cached(struct cmd_context *cmd, struct dev_filter *f, struct dm_list *devs)
|
|
{
|
|
if (!scan_bcache)
|
|
return 0;
|
|
|
|
_scan_list(cmd, f, devs, 0, NULL);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Scan and cache lvm data from the listed devices. If a device is already
|
|
* scanned and cached, this replaces the previously cached lvm data for the
|
|
* device. This is called when vg_read() wants to guarantee that it is using
|
|
* the latest data from the devices in the VG (since the scan populated bcache
|
|
* without a lock.)
|
|
*/
|
|
|
|
int label_scan_devs(struct cmd_context *cmd, struct dev_filter *f, struct dm_list *devs)
|
|
{
|
|
struct device_list *devl;
|
|
|
|
if (!scan_bcache) {
|
|
if (!_setup_bcache())
|
|
return 0;
|
|
}
|
|
|
|
dm_list_iterate_items(devl, devs) {
|
|
if (_in_bcache(devl->dev))
|
|
_invalidate_di(scan_bcache, devl->dev->bcache_di);
|
|
}
|
|
|
|
_scan_list(cmd, f, devs, 0, NULL);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int label_scan_devs_rw(struct cmd_context *cmd, struct dev_filter *f, struct dm_list *devs)
|
|
{
|
|
struct device_list *devl;
|
|
|
|
if (!scan_bcache) {
|
|
if (!_setup_bcache())
|
|
return 0;
|
|
}
|
|
|
|
dm_list_iterate_items(devl, devs) {
|
|
if (_in_bcache(devl->dev))
|
|
_invalidate_di(scan_bcache, devl->dev->bcache_di);
|
|
devl->dev->flags |= DEV_BCACHE_WRITE;
|
|
}
|
|
|
|
_scan_list(cmd, f, devs, 0, NULL);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int label_scan_devs_excl(struct cmd_context *cmd, struct dev_filter *f, struct dm_list *devs)
|
|
{
|
|
struct device_list *devl;
|
|
int failed = 0;
|
|
|
|
dm_list_iterate_items(devl, devs) {
|
|
label_scan_invalidate(devl->dev);
|
|
/*
|
|
* With this flag set, _scan_dev_open() done by
|
|
* _scan_list() will do open EXCL
|
|
*/
|
|
devl->dev->flags |= DEV_BCACHE_EXCL;
|
|
devl->dev->flags |= DEV_BCACHE_WRITE;
|
|
}
|
|
|
|
_scan_list(cmd, f, devs, 1, &failed);
|
|
|
|
if (failed)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
void label_scan_invalidate(struct device *dev)
|
|
{
|
|
if (_in_bcache(dev)) {
|
|
_invalidate_di(scan_bcache, dev->bcache_di);
|
|
_scan_dev_close(dev);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If a PV is stacked on an LV, then the LV is kept open
|
|
* in bcache, and needs to be closed so the open fd doesn't
|
|
* interfere with processing the LV.
|
|
*/
|
|
|
|
void label_scan_invalidate_lv(struct cmd_context *cmd, struct logical_volume *lv)
|
|
{
|
|
struct lvinfo lvinfo;
|
|
struct device *dev;
|
|
dev_t devt;
|
|
|
|
if (!lv_info(cmd, lv, 0, &lvinfo, 0, 0))
|
|
return;
|
|
|
|
devt = MKDEV(lvinfo.major, lvinfo.minor);
|
|
if ((dev = dev_cache_get_by_devt(cmd, devt, NULL, NULL)))
|
|
label_scan_invalidate(dev);
|
|
}
|
|
|
|
/*
|
|
* Empty the bcache of all blocks and close all open fds,
|
|
* but keep the bcache set up.
|
|
*/
|
|
|
|
void label_scan_drop(struct cmd_context *cmd)
|
|
{
|
|
struct dev_iter *iter;
|
|
struct device *dev;
|
|
|
|
if (!(iter = dev_iter_create(NULL, 0)))
|
|
return;
|
|
|
|
while ((dev = dev_iter_get(cmd, iter))) {
|
|
cmd->filter->wipe(cmd, cmd->filter, dev, NULL);
|
|
if (_in_bcache(dev))
|
|
_scan_dev_close(dev);
|
|
}
|
|
dev_iter_destroy(iter);
|
|
}
|
|
|
|
/*
|
|
* Close devices that are open because bcache is holding blocks for them.
|
|
* Destroy the bcache.
|
|
*/
|
|
|
|
void label_scan_destroy(struct cmd_context *cmd)
|
|
{
|
|
if (!scan_bcache)
|
|
return;
|
|
|
|
label_scan_drop(cmd);
|
|
|
|
bcache_destroy(scan_bcache);
|
|
scan_bcache = NULL;
|
|
}
|
|
|
|
/*
|
|
* Read (or re-read) and process (or re-process) the data for a device. This
|
|
* will reset (clear and repopulate) the bcache and lvmcache info for this
|
|
* device. There are only a couple odd places that want to reread a specific
|
|
* device, this is not a commonly used function.
|
|
*/
|
|
|
|
int label_scan_dev(struct device *dev)
|
|
{
|
|
struct dm_list one_dev;
|
|
struct device_list *devl;
|
|
int failed = 0;
|
|
|
|
/* scanning is done by list, so make a single item list for this dev */
|
|
if (!(devl = zalloc(sizeof(*devl))))
|
|
return 0;
|
|
devl->dev = dev;
|
|
dm_list_init(&one_dev);
|
|
dm_list_add(&one_dev, &devl->list);
|
|
|
|
label_scan_invalidate(dev);
|
|
|
|
_scan_list(NULL, NULL, &one_dev, 0, &failed);
|
|
|
|
free(devl);
|
|
|
|
if (failed)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
int label_scan_setup_bcache(void)
|
|
{
|
|
if (!scan_bcache) {
|
|
if (!_setup_bcache())
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* This is needed to write to a new non-lvm device.
|
|
* Scanning that dev would not keep it open or in
|
|
* bcache, but to use bcache_write we need the dev
|
|
* to be open so we can use dev->bcache_di to write.
|
|
*/
|
|
|
|
int label_scan_open(struct device *dev)
|
|
{
|
|
if (!_in_bcache(dev))
|
|
return _scan_dev_open(dev);
|
|
return 1;
|
|
}
|
|
|
|
int label_scan_open_excl(struct device *dev)
|
|
{
|
|
if (_in_bcache(dev) && !(dev->flags & DEV_BCACHE_EXCL)) {
|
|
log_debug("close and reopen excl %s", dev_name(dev));
|
|
_invalidate_di(scan_bcache, dev->bcache_di);
|
|
_scan_dev_close(dev);
|
|
}
|
|
dev->flags |= DEV_BCACHE_EXCL;
|
|
dev->flags |= DEV_BCACHE_WRITE;
|
|
return label_scan_open(dev);
|
|
}
|
|
|
|
int label_scan_open_rw(struct device *dev)
|
|
{
|
|
if (_in_bcache(dev) && !(dev->flags & DEV_BCACHE_WRITE)) {
|
|
log_debug("close and reopen rw %s", dev_name(dev));
|
|
_invalidate_di(scan_bcache, dev->bcache_di);
|
|
_scan_dev_close(dev);
|
|
}
|
|
dev->flags |= DEV_BCACHE_WRITE;
|
|
return label_scan_open(dev);
|
|
}
|
|
|
|
int label_scan_reopen_rw(struct device *dev)
|
|
{
|
|
int flags = 0;
|
|
int prev_fd = dev->bcache_fd;
|
|
int fd;
|
|
|
|
if (!(dev->flags & DEV_IN_BCACHE)) {
|
|
if ((dev->bcache_fd != -1) || (dev->bcache_di != -1)) {
|
|
/* shouldn't happen */
|
|
log_debug("Reopen writeable %s uncached fd %d di %d",
|
|
dev_name(dev), dev->bcache_fd, dev->bcache_di);
|
|
return 0;
|
|
}
|
|
dev->flags |= DEV_BCACHE_WRITE;
|
|
return _scan_dev_open(dev);
|
|
}
|
|
|
|
if ((dev->flags & DEV_BCACHE_WRITE))
|
|
return 1;
|
|
|
|
if (dev->bcache_fd == -1) {
|
|
log_error("Failed to open writable %s index %d fd none",
|
|
dev_name(dev), dev->bcache_di);
|
|
return 0;
|
|
}
|
|
if (dev->bcache_di == -1) {
|
|
log_error("Failed to open writeable %s index none fd %d",
|
|
dev_name(dev), dev->bcache_fd);
|
|
return 0;
|
|
}
|
|
|
|
flags |= O_DIRECT;
|
|
flags |= O_NOATIME;
|
|
flags |= O_RDWR;
|
|
|
|
fd = open(dev_name(dev), flags, 0777);
|
|
if (fd < 0) {
|
|
log_error("Failed to open rw %s errno %d di %d fd %d.",
|
|
dev_name(dev), errno, dev->bcache_di, dev->bcache_fd);
|
|
return 0;
|
|
}
|
|
|
|
if (!bcache_change_fd(dev->bcache_di, fd)) {
|
|
log_error("Failed to change to rw fd %s di %d fd %d.",
|
|
dev_name(dev), dev->bcache_di, fd);
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
if (close(dev->bcache_fd))
|
|
log_debug("reopen writeable %s close prev errno %d di %d fd %d.",
|
|
dev_name(dev), errno, dev->bcache_di, dev->bcache_fd);
|
|
|
|
dev->flags |= DEV_IN_BCACHE;
|
|
dev->flags |= DEV_BCACHE_WRITE;
|
|
dev->bcache_fd = fd;
|
|
|
|
log_debug("reopen writable %s di %d prev %d fd %d",
|
|
dev_name(dev), dev->bcache_di, prev_fd, fd);
|
|
|
|
return 1;
|
|
}
|
|
|
|
bool dev_read_bytes(struct device *dev, uint64_t start, size_t len, void *data)
|
|
{
|
|
if (!scan_bcache) {
|
|
/* Should not happen */
|
|
log_error("dev_read bcache not set up %s", dev_name(dev));
|
|
return false;
|
|
}
|
|
|
|
if (dev->bcache_di < 0) {
|
|
/* This is not often needed. */
|
|
if (!label_scan_open(dev)) {
|
|
log_error("Error opening device %s for reading at %llu length %u.",
|
|
dev_name(dev), (unsigned long long)start, (uint32_t)len);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (!bcache_read_bytes(scan_bcache, dev->bcache_di, start, len, data)) {
|
|
log_error("Error reading device %s at %llu length %u.",
|
|
dev_name(dev), (unsigned long long)start, (uint32_t)len);
|
|
label_scan_invalidate(dev);
|
|
return false;
|
|
}
|
|
return true;
|
|
|
|
}
|
|
|
|
bool dev_write_bytes(struct device *dev, uint64_t start, size_t len, void *data)
|
|
{
|
|
if (test_mode())
|
|
return true;
|
|
|
|
if (!scan_bcache) {
|
|
/* Should not happen */
|
|
log_error("dev_write bcache not set up %s", dev_name(dev));
|
|
return false;
|
|
}
|
|
|
|
if (_in_bcache(dev) && !(dev->flags & DEV_BCACHE_WRITE)) {
|
|
/* FIXME: avoid tossing out bcache blocks just to replace fd. */
|
|
log_debug("close and reopen to write %s", dev_name(dev));
|
|
_invalidate_di(scan_bcache, dev->bcache_di);
|
|
_scan_dev_close(dev);
|
|
|
|
dev->flags |= DEV_BCACHE_WRITE;
|
|
label_scan_open(dev);
|
|
}
|
|
|
|
if (dev->bcache_di < 0) {
|
|
/* This is not often needed. */
|
|
dev->flags |= DEV_BCACHE_WRITE;
|
|
if (!label_scan_open(dev)) {
|
|
log_error("Error opening device %s for writing at %llu length %u.",
|
|
dev_name(dev), (unsigned long long)start, (uint32_t)len);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (!bcache_write_bytes(scan_bcache, dev->bcache_di, start, len, data)) {
|
|
log_error("Error writing device %s at %llu length %u.",
|
|
dev_name(dev), (unsigned long long)start, (uint32_t)len);
|
|
dev_unset_last_byte(dev);
|
|
label_scan_invalidate(dev);
|
|
return false;
|
|
}
|
|
|
|
if (!bcache_flush(scan_bcache)) {
|
|
log_error("Error writing device %s at %llu length %u.",
|
|
dev_name(dev), (unsigned long long)start, (uint32_t)len);
|
|
dev_unset_last_byte(dev);
|
|
label_scan_invalidate(dev);
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool dev_invalidate_bytes(struct device *dev, uint64_t start, size_t len)
|
|
{
|
|
return bcache_invalidate_bytes(scan_bcache, dev->bcache_di, start, len);
|
|
}
|
|
|
|
bool dev_write_zeros(struct device *dev, uint64_t start, size_t len)
|
|
{
|
|
return dev_set_bytes(dev, start, len, 0);
|
|
}
|
|
|
|
bool dev_set_bytes(struct device *dev, uint64_t start, size_t len, uint8_t val)
|
|
{
|
|
bool rv;
|
|
|
|
if (test_mode())
|
|
return true;
|
|
|
|
if (!scan_bcache) {
|
|
log_error("dev_set_bytes bcache not set up %s", dev_name(dev));
|
|
return false;
|
|
}
|
|
|
|
if (_in_bcache(dev) && !(dev->flags & DEV_BCACHE_WRITE)) {
|
|
log_debug("close and reopen to write %s", dev_name(dev));
|
|
_invalidate_di(scan_bcache, dev->bcache_di);
|
|
_scan_dev_close(dev);
|
|
/* goes to label_scan_open() since bcache_di < 0 */
|
|
}
|
|
|
|
if (dev->bcache_di == -1) {
|
|
/* This is not often needed. */
|
|
dev->flags |= DEV_BCACHE_WRITE;
|
|
if (!label_scan_open(dev)) {
|
|
log_error("Error opening device %s for writing at %llu length %u.",
|
|
dev_name(dev), (unsigned long long)start, (uint32_t)len);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
dev_set_last_byte(dev, start + len);
|
|
|
|
if (!val)
|
|
rv = bcache_zero_bytes(scan_bcache, dev->bcache_di, start, len);
|
|
else
|
|
rv = bcache_set_bytes(scan_bcache, dev->bcache_di, start, len, val);
|
|
|
|
if (!rv) {
|
|
log_error("Error writing device value %s at %llu length %u.",
|
|
dev_name(dev), (unsigned long long)start, (uint32_t)len);
|
|
goto fail;
|
|
}
|
|
|
|
if (!bcache_flush(scan_bcache)) {
|
|
log_error("Error writing device %s at %llu length %u.",
|
|
dev_name(dev), (unsigned long long)start, (uint32_t)len);
|
|
goto fail;
|
|
}
|
|
|
|
dev_unset_last_byte(dev);
|
|
return true;
|
|
|
|
fail:
|
|
dev_unset_last_byte(dev);
|
|
label_scan_invalidate(dev);
|
|
return false;
|
|
}
|
|
|
|
void dev_set_last_byte(struct device *dev, uint64_t offset)
|
|
{
|
|
unsigned int physical_block_size = 0;
|
|
unsigned int logical_block_size = 0;
|
|
unsigned int bs;
|
|
|
|
if (!dev_get_direct_block_sizes(dev, &physical_block_size, &logical_block_size)) {
|
|
stack;
|
|
return; /* FIXME: error path ? */
|
|
}
|
|
|
|
if ((physical_block_size == 512) && (logical_block_size == 512))
|
|
bs = 512;
|
|
else if ((physical_block_size == 4096) && (logical_block_size == 4096))
|
|
bs = 4096;
|
|
else if ((physical_block_size == 512) || (logical_block_size == 512)) {
|
|
log_debug("Set last byte mixed block sizes physical %u logical %u using 512",
|
|
physical_block_size, logical_block_size);
|
|
bs = 512;
|
|
} else if ((physical_block_size == 4096) || (logical_block_size == 4096)) {
|
|
log_debug("Set last byte mixed block sizes physical %u logical %u using 4096",
|
|
physical_block_size, logical_block_size);
|
|
bs = 4096;
|
|
} else {
|
|
log_debug("Set last byte mixed block sizes physical %u logical %u using 512",
|
|
physical_block_size, logical_block_size);
|
|
bs = 512;
|
|
}
|
|
|
|
bcache_set_last_byte(scan_bcache, dev->bcache_di, offset, bs);
|
|
}
|
|
|
|
void dev_unset_last_byte(struct device *dev)
|
|
{
|
|
bcache_unset_last_byte(scan_bcache, dev->bcache_di);
|
|
}
|