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lvm2/lib/format_text/text_label.c
Zdenek Kabelac c451d7925d cleanup: correcting some log_print
Correcting to log_print_unless_silent(),
so -qq can do some work.
2023-05-06 20:38:49 +02:00

686 lines
19 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 "base/memory/zalloc.h"
#include "lib/misc/lib.h"
#include "lib/format_text/format-text.h"
#include "layout.h"
#include "lib/label/label.h"
#include "lib/mm/xlate.h"
#include "lib/cache/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 (!memcmp(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 */
memcpy(label->type, LVM2_LABEL, sizeof(label->type));
memcpy(lh->type, LVM2_LABEL, sizeof(lh->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 " FMTu64 " 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 = 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);
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);
}
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,
struct metadata_area **mda_new)
{
struct metadata_area *mdal, *mda;
struct mda_lists *mda_lists = (struct mda_lists *) fmt->private;
struct mda_context *mdac, *mdac2;
if (!mem) {
if (!(mdal = malloc(sizeof(struct metadata_area)))) {
log_error("struct mda_list allocation failed");
return 0;
}
if (!(mdac = malloc(sizeof(struct mda_context)))) {
log_error("struct mda_context allocation failed");
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);
if (mda_new)
*mda_new = mdal;
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);
free(mda->metadata_locn);
dm_list_del(&mda->list);
free(mda);
}
}
static int _text_initialise_label(struct labeller *l __attribute__((unused)),
struct label *label)
{
memcpy(label->type, LVM2_LABEL, sizeof(label->type));
return 1;
}
static int _read_mda_header_and_metadata(const struct format_type *fmt,
struct metadata_area *mda,
struct lvmcache_vgsummary *vgsummary,
uint32_t *bad_fields)
{
struct mda_context *mdac = (struct mda_context *) mda->metadata_locn;
struct mda_header *mdah;
int retries = 0;
retry:
if (!(mdah = raw_read_mda_header(fmt, &mdac->area, (mda->mda_num == 1), 0, bad_fields))) {
log_warn("WARNING: bad metadata header on %s at %llu.",
dev_name(mdac->area.dev),
(unsigned long long)mdac->area.start);
mda->header_start = mdac->area.start;
*bad_fields |= BAD_MDA_HEADER;
return 0;
}
mda->header_start = mdah->start;
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 " FMTu64,
dev_name(mdac->area.dev),
mdac->area.start);
vgsummary->mda_ignored = 1;
return 1;
}
if (!read_metadata_location_summary(fmt, mda, mdah, mda_is_primary(mda), &mdac->area,
vgsummary, &mdac->free_sectors)) {
if (vgsummary->zero_offset)
return 1;
/*
* This code is used by label_scan to get a summary of the
* VG metadata that will be properly read later by vg_read.
* The initial read of this device during label_scan
* populates bcache with the first 128K of data from the
* device. That block of data contains the mda_header
* (at 4k) but will often not include the metadata text,
* which is often located further into the metadata area
* (beyond the 128K block saved in bcache.)
* So read_metadata_location_summary will usually get the
* mda_header from bcache which was read initially, and
* then it will often need to do a new disk read to get
* the actual metadata text that the mda_header points to.
* Since there is no locking around label_scan, it's
* possible (but very rare) that the entire metadata area
* can be rewritten by other commands between the time that
* this command read the mda_header and the time that it
* reads the metadata text. This means the expected metadata
* text isn't found, and an error is returned here.
* To handle this, invalidate all data in bcache for this
* device and reread the mda_header and metadata text back to
* back, so inconsistency is less likely (without locking
* there's no guarantee, e.g. if the command is blocked
* somehow between the two reads.)
*/
if (!retries) {
log_print_unless_silent("Retrying metadata scan.");
retries++;
dev_invalidate(mdac->area.dev);
goto retry;
}
log_warn("WARNING: bad metadata text on %s in mda%d",
dev_name(mdac->area.dev), mda->mda_num);
*bad_fields |= BAD_MDA_TEXT;
return 0;
}
return 1;
}
/*
* Used by label_scan to get a summary of the VG that exists on this PV. This
* summary is stored in lvmcache vginfo/info/info->mdas and is used later by
* vg_read which needs to know which PVs to read for a given VG name, and where
* the metadata is at for those PVs.
*/
static int _text_read(struct cmd_context *cmd, struct labeller *labeller, struct device *dev, void *label_buf,
uint64_t label_sector, int *is_duplicate)
{
struct lvmcache_vgsummary vgsummary;
char pvid[ID_LEN + 1] __attribute__((aligned(8))) = { 0 };
char vgid[ID_LEN + 1] __attribute__((aligned(8))) = { 0 };
struct lvmcache_info *info;
const struct format_type *fmt = labeller->fmt;
struct label_header *lh = (struct label_header *) label_buf;
struct pv_header *pvhdr;
struct pv_header_extension *pvhdr_ext;
struct metadata_area *mda = NULL;
struct metadata_area *mda1 = NULL;
struct metadata_area *mda2 = NULL;
struct disk_locn *dlocn_xl;
uint64_t offset;
uint32_t ext_version;
uint32_t bad_fields;
int mda_count = 0;
int good_mda_count = 0;
int bad_mda_count = 0;
int rv1, rv2;
/*
* PV header base
*/
pvhdr = (struct pv_header *) ((char *) label_buf + xlate32(lh->offset_xl));
memcpy(pvid, &pvhdr->pv_uuid, ID_LEN);
strncpy(vgid, FMT_TEXT_ORPHAN_VG_NAME, ID_LEN);
/*
* FIXME: stop adding the device to lvmcache initially as an orphan
* (and then moving it later) and instead just add it when we know the
* VG.
*
* If another device with this same PVID has already been seen,
* lvmcache_add will put this device in the duplicates list in lvmcache
* and return NULL. At the end of label_scan, the duplicate devs are
* compared, and if another dev is preferred for this PV, then the
* existing dev is removed from lvmcache and _text_read is called again
* for this dev, and lvmcache_add will add it.
*
* Other reasons for lvmcache_add to return NULL are internal errors.
*/
if (!(info = lvmcache_add(cmd, labeller, pvid, dev, label_sector,
vgid,
vgid, 0, is_duplicate)))
return_0;
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++;
}
dlocn_xl++;
/* Metadata areas */
while ((offset = xlate64(dlocn_xl->offset))) {
/*
* This just calls add_mda() above, replacing info with info->mdas.
*/
lvmcache_add_mda(info, dev, offset, xlate64(dlocn_xl->size), 0, &mda);
dlocn_xl++;
mda_count++;
if (mda_count == 1) {
mda1 = mda;
mda1->mda_num = 1;
}
else if (mda_count == 2) {
mda2 = mda;
mda2->mda_num = 2;
}
}
dlocn_xl++;
/*
* PV header extension
*/
pvhdr_ext = (struct pv_header_extension *) ((char *) dlocn_xl);
if (!(ext_version = xlate32(pvhdr_ext->version)))
goto scan_mdas;
if (ext_version != PV_HEADER_EXTENSION_VSN)
log_debug_metadata("Found pv_header_extension version " FMTu32 " on %s",
ext_version, dev_name(dev));
/* 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++;
}
scan_mdas:
if (!mda_count) {
log_debug_metadata("Scanning %s found no mdas.", dev_name(dev));
return 1;
}
/*
* Track which devs have bad metadata so repair can find them (even if
* this dev also has good metadata that we are able to use).
*
* When bad metadata is seen, the unusable mda struct is removed from
* lvmcache info->mdas. This means that vg_read and vg_write will skip
* the bad mda not try to read or write the bad metadata. The bad mdas
* are saved in a separate bad_mdas list in lvmcache so that repair can
* find them to repair.
*/
if (mda1) {
log_debug_metadata("Scanning %s mda1 summary.", dev_name(dev));
memset(&vgsummary, 0, sizeof(vgsummary));
dm_list_init(&vgsummary.pvsummaries);
bad_fields = 0;
vgsummary.mda_num = 1;
rv1 = _read_mda_header_and_metadata(fmt, mda1, &vgsummary, &bad_fields);
if (rv1 && !vgsummary.zero_offset && !vgsummary.mda_ignored) {
if (!lvmcache_update_vgname_and_id(cmd, info, &vgsummary)) {
/* I believe this is only an internal error. */
dm_list_del(&mda1->list);
/* Are there other cases besides mismatch and internal error? */
if (vgsummary.mismatch) {
log_warn("WARNING: Scanning %s mda1 found mismatch with other metadata.", dev_name(dev));
bad_fields |= BAD_MDA_MISMATCH;
} else {
log_warn("WARNING: Scanning %s mda1 failed to save internal summary.", dev_name(dev));
bad_fields |= BAD_MDA_INTERNAL;
}
mda1->bad_fields = bad_fields;
lvmcache_save_bad_mda(info, mda1);
mda1 = NULL;
bad_mda_count++;
} else {
/* The normal success path */
log_debug("Found metadata seqno %u in mda1 on %s", vgsummary.seqno, dev_name(dev));
good_mda_count++;
}
}
if (!rv1) {
/*
* Remove the bad mda from normal mda list so it's not
* used by vg_read/vg_write, but keep track of it in
* lvmcache for repair.
*/
log_warn("WARNING: scanning %s mda1 failed to read metadata summary.", dev_name(dev));
log_warn("WARNING: repair VG metadata on %s with vgck --updatemetadata.", dev_name(dev));
dm_list_del(&mda1->list);
mda1->bad_fields = bad_fields;
lvmcache_save_bad_mda(info, mda1);
mda1 = NULL;
bad_mda_count++;
}
}
if (mda2) {
log_debug_metadata("Scanning %s mda2 summary.", dev_name(dev));
memset(&vgsummary, 0, sizeof(vgsummary));
dm_list_init(&vgsummary.pvsummaries);
bad_fields = 0;
vgsummary.mda_num = 2;
rv2 = _read_mda_header_and_metadata(fmt, mda2, &vgsummary, &bad_fields);
if (rv2 && !vgsummary.zero_offset && !vgsummary.mda_ignored) {
if (!lvmcache_update_vgname_and_id(cmd, info, &vgsummary)) {
dm_list_del(&mda2->list);
/* Are there other cases besides mismatch and internal error? */
if (vgsummary.mismatch) {
log_warn("WARNING: Scanning %s mda2 found mismatch with other metadata.", dev_name(dev));
bad_fields |= BAD_MDA_MISMATCH;
} else {
log_warn("WARNING: Scanning %s mda2 failed to save internal summary.", dev_name(dev));
bad_fields |= BAD_MDA_INTERNAL;
}
mda2->bad_fields = bad_fields;
lvmcache_save_bad_mda(info, mda2);
mda2 = NULL;
bad_mda_count++;
} else {
/* The normal success path */
log_debug("Found metadata seqno %u in mda2 on %s", vgsummary.seqno, dev_name(dev));
good_mda_count++;
}
}
if (!rv2) {
/*
* Remove the bad mda from normal mda list so it's not
* used by vg_read/vg_write, but keep track of it in
* lvmcache for repair.
*/
log_warn("WARNING: scanning %s mda2 failed to read metadata summary.", dev_name(dev));
log_warn("WARNING: repair VG metadata on %s with vgck --updatemetadata.", dev_name(dev));
dm_list_del(&mda2->list);
mda2->bad_fields = bad_fields;
lvmcache_save_bad_mda(info, mda2);
mda2 = NULL;
bad_mda_count++;
}
}
if (good_mda_count)
return 1;
if (bad_mda_count)
return 0;
/* no metadata in the mdas */
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)
{
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 = zalloc(sizeof(*l)))) {
log_error("Couldn't allocate labeller object.");
return NULL;
}
l->ops = &_text_ops;
l->fmt = fmt;
return l;
}