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lvm2/lib/cache/lvmcache.c
David Teigland be23fae488 lvmcache: set device in label when switching devs V2 
This is an alternative/equivalent to commit
ca67cf84df

The problem (wrong label->dev after a new preferred
duplicate device is chosen) was isolated to the lvmetad
case (non-lvmetad worked fine), and this fixes the problem
by setting the new label->dev in the lvmetad-specific
code rather than in the general lvmcache code.
2015-05-08 17:10:53 -05:00

2330 lines
60 KiB
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/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2011 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 "lvmcache.h"
#include "toolcontext.h"
#include "dev-cache.h"
#include "locking.h"
#include "metadata.h"
#include "memlock.h"
#include "str_list.h"
#include "format-text.h"
#include "format_pool.h"
#include "format1.h"
#include "config.h"
#include "lvmetad.h"
#define CACHE_INVALID 0x00000001
#define CACHE_LOCKED 0x00000002
/* One per device */
struct lvmcache_info {
struct dm_list list; /* Join VG members together */
struct dm_list mdas; /* list head for metadata areas */
struct dm_list das; /* list head for data areas */
struct dm_list bas; /* list head for bootloader areas */
struct lvmcache_vginfo *vginfo; /* NULL == unknown */
struct label *label;
const struct format_type *fmt;
struct device *dev;
uint64_t device_size; /* Bytes */
uint32_t status;
};
/* One per VG */
struct lvmcache_vginfo {
struct dm_list list; /* Join these vginfos together */
struct dm_list infos; /* List head for lvmcache_infos */
const struct format_type *fmt;
char *vgname; /* "" == orphan */
uint32_t status;
char vgid[ID_LEN + 1];
char _padding[7];
struct lvmcache_vginfo *next; /* Another VG with same name? */
char *creation_host;
uint32_t mda_checksum;
size_t mda_size;
size_t vgmetadata_size;
char *vgmetadata; /* Copy of VG metadata as format_text string */
struct dm_config_tree *cft; /* Config tree created from vgmetadata */
/* Lifetime is directly tied to vgmetadata */
struct volume_group *cached_vg;
unsigned holders;
unsigned vg_use_count; /* Counter of vg reusage */
unsigned precommitted; /* Is vgmetadata live or precommitted? */
unsigned cached_vg_invalidated; /* Signal to regenerate cached_vg */
unsigned preferred_duplicates; /* preferred duplicate pvs have been set */
};
static struct dm_hash_table *_pvid_hash = NULL;
static struct dm_hash_table *_vgid_hash = NULL;
static struct dm_hash_table *_vgname_hash = NULL;
static struct dm_hash_table *_lock_hash = NULL;
static DM_LIST_INIT(_vginfos);
static int _scanning_in_progress = 0;
static int _has_scanned = 0;
static int _vgs_locked = 0;
static int _vg_global_lock_held = 0; /* Global lock held when cache wiped? */
static int _found_duplicate_pvs = 0; /* If we never see a duplicate PV we can skip checking for them later. */
int lvmcache_init(void)
{
/*
* FIXME add a proper lvmcache_locking_reset() that
* resets the cache so no previous locks are locked
*/
_vgs_locked = 0;
dm_list_init(&_vginfos);
if (!(_vgname_hash = dm_hash_create(128)))
return 0;
if (!(_vgid_hash = dm_hash_create(128)))
return 0;
if (!(_pvid_hash = dm_hash_create(128)))
return 0;
if (!(_lock_hash = dm_hash_create(128)))
return 0;
/*
* Reinitialising the cache clears the internal record of
* which locks are held. The global lock can be held during
* this operation so its state must be restored afterwards.
*/
if (_vg_global_lock_held) {
lvmcache_lock_vgname(VG_GLOBAL, 0);
_vg_global_lock_held = 0;
}
return 1;
}
/*
* Once PV info has been populated in lvmcache and
* lvmcache has chosen preferred duplicate devices,
* set this flag so that lvmcache will not try to
* compare and choose preferred duplicate devices
* again (which may result in different preferred
* devices.) PV info can be populated in lvmcache
* multiple times, each time causing lvmcache to
* compare the duplicate devices, so we need to
* record that the comparison/preferences have
* already been done, so the preferrences from the
* first time through are not changed.
*
* This is something of a hack to work around the
* fact that the code isn't really designed to
* handle duplicate PVs, and the fact that lvmetad
* has its own way of picking a preferred duplicate
* and lvmcache has another way based on having
* more information than lvmetad does.
*
* If we come up with a better overall method to
* handle duplicate PVs, then this can probably be
* removed.
*
* FIXME: if we want to make lvmetad work with clvmd,
* then this may need to be changed to set
* preferred_duplicates back to 0.
*/
void lvmcache_set_preferred_duplicates(const char *vgid)
{
struct lvmcache_vginfo *vginfo;
if (!(vginfo = lvmcache_vginfo_from_vgid(vgid))) {
stack;
return;
}
vginfo->preferred_duplicates = 1;
}
void lvmcache_seed_infos_from_lvmetad(struct cmd_context *cmd)
{
if (!lvmetad_active() || _has_scanned)
return;
if (!lvmetad_pv_list_to_lvmcache(cmd)) {
stack;
return;
}
_has_scanned = 1;
}
/* Volume Group metadata cache functions */
static void _free_cached_vgmetadata(struct lvmcache_vginfo *vginfo)
{
if (!vginfo || !vginfo->vgmetadata)
return;
dm_free(vginfo->vgmetadata);
vginfo->vgmetadata = NULL;
/* Release also cached config tree */
if (vginfo->cft) {
dm_config_destroy(vginfo->cft);
vginfo->cft = NULL;
}
log_debug_cache("Metadata cache: VG %s wiped.", vginfo->vgname);
release_vg(vginfo->cached_vg);
}
/*
* Cache VG metadata against the vginfo with matching vgid.
*/
static void _store_metadata(struct volume_group *vg, unsigned precommitted)
{
char uuid[64] __attribute__((aligned(8)));
struct lvmcache_vginfo *vginfo;
char *data;
size_t size;
if (!(vginfo = lvmcache_vginfo_from_vgid((const char *)&vg->id))) {
stack;
return;
}
if (!(size = export_vg_to_buffer(vg, &data))) {
stack;
_free_cached_vgmetadata(vginfo);
return;
}
/* Avoid reparsing of the same data string */
if (vginfo->vgmetadata && vginfo->vgmetadata_size == size &&
strcmp(vginfo->vgmetadata, data) == 0)
dm_free(data);
else {
_free_cached_vgmetadata(vginfo);
vginfo->vgmetadata_size = size;
vginfo->vgmetadata = data;
}
vginfo->precommitted = precommitted;
if (!id_write_format((const struct id *)vginfo->vgid, uuid, sizeof(uuid))) {
stack;
return;
}
log_debug_cache("Metadata cache: VG %s (%s) stored (%" PRIsize_t " bytes%s).",
vginfo->vgname, uuid, size,
precommitted ? ", precommitted" : "");
}
static void _update_cache_info_lock_state(struct lvmcache_info *info,
int locked,
int *cached_vgmetadata_valid)
{
int was_locked = (info->status & CACHE_LOCKED) ? 1 : 0;
/*
* Cache becomes invalid whenever lock state changes unless
* exclusive VG_GLOBAL is held (i.e. while scanning).
*/
if (!lvmcache_vgname_is_locked(VG_GLOBAL) && (was_locked != locked)) {
info->status |= CACHE_INVALID;
*cached_vgmetadata_valid = 0;
}
if (locked)
info->status |= CACHE_LOCKED;
else
info->status &= ~CACHE_LOCKED;
}
static void _update_cache_vginfo_lock_state(struct lvmcache_vginfo *vginfo,
int locked)
{
struct lvmcache_info *info;
int cached_vgmetadata_valid = 1;
dm_list_iterate_items(info, &vginfo->infos)
_update_cache_info_lock_state(info, locked,
&cached_vgmetadata_valid);
if (!cached_vgmetadata_valid)
_free_cached_vgmetadata(vginfo);
}
static void _update_cache_lock_state(const char *vgname, int locked)
{
struct lvmcache_vginfo *vginfo;
if (!(vginfo = lvmcache_vginfo_from_vgname(vgname, NULL)))
return;
_update_cache_vginfo_lock_state(vginfo, locked);
}
static void _drop_metadata(const char *vgname, int drop_precommitted)
{
struct lvmcache_vginfo *vginfo;
struct lvmcache_info *info;
if (!(vginfo = lvmcache_vginfo_from_vgname(vgname, NULL)))
return;
/*
* Invalidate cached PV labels.
* If cached precommitted metadata exists that means we
* already invalidated the PV labels (before caching it)
* and we must not do it again.
*/
if (!drop_precommitted && vginfo->precommitted && !vginfo->vgmetadata)
log_error(INTERNAL_ERROR "metadata commit (or revert) missing before "
"dropping metadata from cache.");
if (drop_precommitted || !vginfo->precommitted)
dm_list_iterate_items(info, &vginfo->infos)
info->status |= CACHE_INVALID;
_free_cached_vgmetadata(vginfo);
/* VG revert */
if (drop_precommitted)
vginfo->precommitted = 0;
}
/*
* Remote node uses this to upgrade precommitted metadata to commited state
* when receives vg_commit notification.
* (Note that devices can be suspended here, if so, precommitted metadata are already read.)
*/
void lvmcache_commit_metadata(const char *vgname)
{
struct lvmcache_vginfo *vginfo;
if (!(vginfo = lvmcache_vginfo_from_vgname(vgname, NULL)))
return;
if (vginfo->precommitted) {
log_debug_cache("Precommitted metadata cache: VG %s upgraded to committed.",
vginfo->vgname);
vginfo->precommitted = 0;
}
}
void lvmcache_drop_metadata(const char *vgname, int drop_precommitted)
{
if (lvmcache_vgname_is_locked(VG_GLOBAL) && !vg_write_lock_held())
return;
/* For VG_ORPHANS, we need to invalidate all labels on orphan PVs. */
if (!strcmp(vgname, VG_ORPHANS)) {
_drop_metadata(FMT_TEXT_ORPHAN_VG_NAME, 0);
_drop_metadata(FMT_LVM1_ORPHAN_VG_NAME, 0);
_drop_metadata(FMT_POOL_ORPHAN_VG_NAME, 0);
/* Indicate that PVs could now be missing from the cache */
init_full_scan_done(0);
} else
_drop_metadata(vgname, drop_precommitted);
}
/*
* Ensure vgname2 comes after vgname1 alphabetically.
* Orphan locks come last.
* VG_GLOBAL comes first.
*/
static int _vgname_order_correct(const char *vgname1, const char *vgname2)
{
if (is_global_vg(vgname1))
return 1;
if (is_global_vg(vgname2))
return 0;
if (is_orphan_vg(vgname1))
return 0;
if (is_orphan_vg(vgname2))
return 1;
if (strcmp(vgname1, vgname2) < 0)
return 1;
return 0;
}
/*
* Ensure VG locks are acquired in alphabetical order.
*/
int lvmcache_verify_lock_order(const char *vgname)
{
struct dm_hash_node *n;
const char *vgname2;
if (!_lock_hash)
return_0;
dm_hash_iterate(n, _lock_hash) {
if (!dm_hash_get_data(_lock_hash, n))
return_0;
if (!(vgname2 = dm_hash_get_key(_lock_hash, n))) {
log_error(INTERNAL_ERROR "VG lock %s hits NULL.",
vgname);
return 0;
}
if (!_vgname_order_correct(vgname2, vgname)) {
log_errno(EDEADLK, INTERNAL_ERROR "VG lock %s must "
"be requested before %s, not after.",
vgname, vgname2);
return 0;
}
}
return 1;
}
void lvmcache_lock_vgname(const char *vgname, int read_only __attribute__((unused)))
{
if (!_lock_hash && !lvmcache_init()) {
log_error("Internal cache initialisation failed");
return;
}
if (dm_hash_lookup(_lock_hash, vgname))
log_error(INTERNAL_ERROR "Nested locking attempted on VG %s.",
vgname);
if (!dm_hash_insert(_lock_hash, vgname, (void *) 1))
log_error("Cache locking failure for %s", vgname);
if (strcmp(vgname, VG_GLOBAL)) {
_update_cache_lock_state(vgname, 1);
_vgs_locked++;
}
}
int lvmcache_vgname_is_locked(const char *vgname)
{
if (!_lock_hash)
return 0;
return dm_hash_lookup(_lock_hash, is_orphan_vg(vgname) ? VG_ORPHANS : vgname) ? 1 : 0;
}
void lvmcache_unlock_vgname(const char *vgname)
{
if (!dm_hash_lookup(_lock_hash, vgname))
log_error(INTERNAL_ERROR "Attempt to unlock unlocked VG %s.",
vgname);
if (strcmp(vgname, VG_GLOBAL))
_update_cache_lock_state(vgname, 0);
dm_hash_remove(_lock_hash, vgname);
/* FIXME Do this per-VG */
if (strcmp(vgname, VG_GLOBAL) && !--_vgs_locked)
dev_close_all();
}
int lvmcache_vgs_locked(void)
{
return _vgs_locked;
}
/*
* When lvmcache sees a duplicate PV, this is set.
* process_each_pv() can avoid searching for duplicates
* by checking this and seeing that no duplicate PVs exist.
*/
int lvmcache_found_duplicate_pvs(void)
{
return _found_duplicate_pvs;
}
static void _vginfo_attach_info(struct lvmcache_vginfo *vginfo,
struct lvmcache_info *info)
{
if (!vginfo)
return;
info->vginfo = vginfo;
dm_list_add(&vginfo->infos, &info->list);
}
static void _vginfo_detach_info(struct lvmcache_info *info)
{
if (!dm_list_empty(&info->list)) {
dm_list_del(&info->list);
dm_list_init(&info->list);
}
info->vginfo = NULL;
}
/* If vgid supplied, require a match. */
struct lvmcache_vginfo *lvmcache_vginfo_from_vgname(const char *vgname, const char *vgid)
{
struct lvmcache_vginfo *vginfo;
if (!vgname)
return lvmcache_vginfo_from_vgid(vgid);
if (!_vgname_hash) {
log_debug_cache(INTERNAL_ERROR "Internal cache is no yet initialized.");
return NULL;
}
if (!(vginfo = dm_hash_lookup(_vgname_hash, vgname))) {
log_debug_cache("Metadata cache has no info for vgname: \"%s\"", vgname);
return NULL;
}
if (vgid)
do
if (!strncmp(vgid, vginfo->vgid, ID_LEN))
return vginfo;
while ((vginfo = vginfo->next));
if (!vginfo)
log_debug_cache("Metadata cache has not found vgname \"%s\" with vgid \"%."
DM_TO_STRING(ID_LEN) "s\".", vgname, vgid ? : "");
return vginfo;
}
const struct format_type *lvmcache_fmt_from_vgname(struct cmd_context *cmd,
const char *vgname, const char *vgid,
unsigned revalidate_labels)
{
struct lvmcache_vginfo *vginfo;
struct lvmcache_info *info;
struct label *label;
struct dm_list *devh, *tmp;
struct dm_list devs;
struct device_list *devl;
struct volume_group *vg;
const struct format_type *fmt;
char vgid_found[ID_LEN + 1] __attribute__((aligned(8)));
if (!(vginfo = lvmcache_vginfo_from_vgname(vgname, vgid))) {
if (!lvmetad_active())
return NULL; /* too bad */
/* If we don't have the info but we have lvmetad, we can ask
* there before failing. */
if ((vg = lvmetad_vg_lookup(cmd, vgname, vgid))) {
fmt = vg->fid->fmt;
release_vg(vg);
return fmt;
}
return NULL;
}
/*
* If this function is called repeatedly, only the first one needs to revalidate.
*/
if (!revalidate_labels)
goto out;
/*
* This function is normally called before reading metadata so
* we check cached labels here. Unfortunately vginfo is volatile.
*/
dm_list_init(&devs);
dm_list_iterate_items(info, &vginfo->infos) {
if (!(devl = dm_malloc(sizeof(*devl)))) {
log_error("device_list element allocation failed");
return NULL;
}
devl->dev = info->dev;
dm_list_add(&devs, &devl->list);
}
memcpy(vgid_found, vginfo->vgid, sizeof(vgid_found));
dm_list_iterate_safe(devh, tmp, &devs) {
devl = dm_list_item(devh, struct device_list);
(void) label_read(devl->dev, &label, UINT64_C(0));
dm_list_del(&devl->list);
dm_free(devl);
}
/* If vginfo changed, caller needs to rescan */
if (!(vginfo = lvmcache_vginfo_from_vgname(vgname, vgid_found)) ||
strncmp(vginfo->vgid, vgid_found, ID_LEN))
return NULL;
out:
return vginfo->fmt;
}
struct lvmcache_vginfo *lvmcache_vginfo_from_vgid(const char *vgid)
{
struct lvmcache_vginfo *vginfo;
char id[ID_LEN + 1] __attribute__((aligned(8)));
if (!_vgid_hash || !vgid) {
log_debug_cache(INTERNAL_ERROR "Internal cache cannot lookup vgid.");
return NULL;
}
/* vgid not necessarily NULL-terminated */
strncpy(&id[0], vgid, ID_LEN);
id[ID_LEN] = '\0';
if (!(vginfo = dm_hash_lookup(_vgid_hash, id))) {
log_debug_cache("Metadata cache has no info for vgid \"%s\"", id);
return NULL;
}
return vginfo;
}
const char *lvmcache_vgname_from_vgid(struct dm_pool *mem, const char *vgid)
{
struct lvmcache_vginfo *vginfo;
const char *vgname = NULL;
if ((vginfo = lvmcache_vginfo_from_vgid(vgid)))
vgname = vginfo->vgname;
if (mem && vgname)
return dm_pool_strdup(mem, vgname);
return vgname;
}
static int _info_is_valid(struct lvmcache_info *info)
{
if (info->status & CACHE_INVALID)
return 0;
/*
* The caller must hold the VG lock to manipulate metadata.
* In a cluster, remote nodes sometimes read metadata in the
* knowledge that the controlling node is holding the lock.
* So if the VG appears to be unlocked here, it should be safe
* to use the cached value.
*/
if (info->vginfo && !lvmcache_vgname_is_locked(info->vginfo->vgname))
return 1;
if (!(info->status & CACHE_LOCKED))
return 0;
return 1;
}
static int _vginfo_is_valid(struct lvmcache_vginfo *vginfo)
{
struct lvmcache_info *info;
/* Invalid if any info is invalid */
dm_list_iterate_items(info, &vginfo->infos)
if (!_info_is_valid(info))
return 0;
return 1;
}
/* vginfo is invalid if it does not contain at least one valid info */
static int _vginfo_is_invalid(struct lvmcache_vginfo *vginfo)
{
struct lvmcache_info *info;
dm_list_iterate_items(info, &vginfo->infos)
if (_info_is_valid(info))
return 0;
return 1;
}
/*
* If valid_only is set, data will only be returned if the cached data is
* known still to be valid.
*/
struct lvmcache_info *lvmcache_info_from_pvid(const char *pvid, int valid_only)
{
struct lvmcache_info *info;
char id[ID_LEN + 1] __attribute__((aligned(8)));
if (!_pvid_hash || !pvid)
return NULL;
strncpy(&id[0], pvid, ID_LEN);
id[ID_LEN] = '\0';
if (!(info = dm_hash_lookup(_pvid_hash, id)))
return NULL;
if (valid_only && !_info_is_valid(info))
return NULL;
return info;
}
const char *lvmcache_vgname_from_info(struct lvmcache_info *info)
{
if (info->vginfo)
return info->vginfo->vgname;
return NULL;
}
char *lvmcache_vgname_from_pvid(struct cmd_context *cmd, const char *pvid)
{
struct lvmcache_info *info;
char *vgname;
if (!lvmcache_device_from_pvid(cmd, (const struct id *)pvid, NULL, NULL)) {
log_error("Couldn't find device with uuid %s.", pvid);
return NULL;
}
info = lvmcache_info_from_pvid(pvid, 0);
if (!info)
return_NULL;
if (!(vgname = dm_pool_strdup(cmd->mem, info->vginfo->vgname))) {
log_errno(ENOMEM, "vgname allocation failed");
return NULL;
}
return vgname;
}
static void _rescan_entry(struct lvmcache_info *info)
{
struct label *label;
if (info->status & CACHE_INVALID)
(void) label_read(info->dev, &label, UINT64_C(0));
}
static int _scan_invalid(void)
{
dm_hash_iter(_pvid_hash, (dm_hash_iterate_fn) _rescan_entry);
return 1;
}
int lvmcache_label_scan(struct cmd_context *cmd, int full_scan)
{
struct label *label;
struct dev_iter *iter;
struct device *dev;
struct format_type *fmt;
int r = 0;
if (lvmetad_active())
return 1;
/* Avoid recursion when a PVID can't be found! */
if (_scanning_in_progress)
return 0;
_scanning_in_progress = 1;
if (!_vgname_hash && !lvmcache_init()) {
log_error("Internal cache initialisation failed");
goto out;
}
if (_has_scanned && !full_scan) {
r = _scan_invalid();
goto out;
}
if (full_scan == 2 && (cmd->full_filter && !cmd->full_filter->use_count) && !refresh_filters(cmd))
goto_out;
if (!cmd->full_filter || !(iter = dev_iter_create(cmd->full_filter, (full_scan == 2) ? 1 : 0))) {
log_error("dev_iter creation failed");
goto out;
}
while ((dev = dev_iter_get(iter)))
(void) label_read(dev, &label, UINT64_C(0));
dev_iter_destroy(iter);
_has_scanned = 1;
/* Perform any format-specific scanning e.g. text files */
if (cmd->independent_metadata_areas)
dm_list_iterate_items(fmt, &cmd->formats)
if (fmt->ops->scan && !fmt->ops->scan(fmt, NULL))
goto out;
/*
* If we are a long-lived process, write out the updated persistent
* device cache for the benefit of short-lived processes.
*/
if (full_scan == 2 && cmd->is_long_lived &&
cmd->dump_filter && cmd->full_filter && cmd->full_filter->dump &&
!cmd->full_filter->dump(cmd->full_filter, 0))
stack;
r = 1;
out:
_scanning_in_progress = 0;
return r;
}
struct volume_group *lvmcache_get_vg(struct cmd_context *cmd, const char *vgname,
const char *vgid, unsigned precommitted)
{
struct lvmcache_vginfo *vginfo;
struct volume_group *vg = NULL;
struct format_instance *fid;
struct format_instance_ctx fic;
/*
* We currently do not store precommitted metadata in lvmetad at
* all. This means that any request for precommitted metadata is served
* using the classic scanning mechanics, and read from disk or from
* lvmcache.
*/
if (lvmetad_active() && !precommitted) {
/* Still serve the locally cached VG if available */
if (vgid && (vginfo = lvmcache_vginfo_from_vgid(vgid)) &&
vginfo->vgmetadata && (vg = vginfo->cached_vg))
goto out;
return lvmetad_vg_lookup(cmd, vgname, vgid);
}
if (!vgid || !(vginfo = lvmcache_vginfo_from_vgid(vgid)) || !vginfo->vgmetadata)
return NULL;
if (!_vginfo_is_valid(vginfo))
return NULL;
/*
* Don't return cached data if either:
* (i) precommitted metadata is requested but we don't have it cached
* - caller should read it off disk;
* (ii) live metadata is requested but we have precommitted metadata cached
* and no devices are suspended so caller may read it off disk.
*
* If live metadata is requested but we have precommitted metadata cached
* and devices are suspended, we assume this precommitted metadata has
* already been preloaded and committed so it's OK to return it as live.
* Note that we do not clear the PRECOMMITTED flag.
*/
if ((precommitted && !vginfo->precommitted) ||
(!precommitted && vginfo->precommitted && !critical_section()))
return NULL;
/* Use already-cached VG struct when available */
if ((vg = vginfo->cached_vg) && !vginfo->cached_vg_invalidated)
goto out;
release_vg(vginfo->cached_vg);
fic.type = FMT_INSTANCE_MDAS | FMT_INSTANCE_AUX_MDAS;
fic.context.vg_ref.vg_name = vginfo->vgname;
fic.context.vg_ref.vg_id = vgid;
if (!(fid = vginfo->fmt->ops->create_instance(vginfo->fmt, &fic)))
return_NULL;
/* Build config tree from vgmetadata, if not yet cached */
if (!vginfo->cft &&
!(vginfo->cft =
dm_config_from_string(vginfo->vgmetadata)))
goto_bad;
if (!(vg = import_vg_from_config_tree(vginfo->cft, fid)))
goto_bad;
/* Cache VG struct for reuse */
vginfo->cached_vg = vg;
vginfo->holders = 1;
vginfo->vg_use_count = 0;
vginfo->cached_vg_invalidated = 0;
vg->vginfo = vginfo;
if (!dm_pool_lock(vg->vgmem, detect_internal_vg_cache_corruption()))
goto_bad;
out:
vginfo->holders++;
vginfo->vg_use_count++;
log_debug_cache("Using cached %smetadata for VG %s with %u holder(s).",
vginfo->precommitted ? "pre-committed " : "",
vginfo->vgname, vginfo->holders);
return vg;
bad:
_free_cached_vgmetadata(vginfo);
return NULL;
}
// #if 0
int lvmcache_vginfo_holders_dec_and_test_for_zero(struct lvmcache_vginfo *vginfo)
{
log_debug_cache("VG %s decrementing %d holder(s) at %p.",
vginfo->cached_vg->name, vginfo->holders, vginfo->cached_vg);
if (--vginfo->holders)
return 0;
if (vginfo->vg_use_count > 1)
log_debug_cache("VG %s reused %d times.",
vginfo->cached_vg->name, vginfo->vg_use_count);
/* Debug perform crc check only when it's been used more then once */
if (!dm_pool_unlock(vginfo->cached_vg->vgmem,
detect_internal_vg_cache_corruption() &&
(vginfo->vg_use_count > 1)))
stack;
vginfo->cached_vg->vginfo = NULL;
vginfo->cached_vg = NULL;
return 1;
}
// #endif
int lvmcache_get_vgnameids(struct cmd_context *cmd, int include_internal,
struct dm_list *vgnameids)
{
struct vgnameid_list *vgnl;
struct lvmcache_vginfo *vginfo;
lvmcache_label_scan(cmd, 0);
dm_list_iterate_items(vginfo, &_vginfos) {
if (!include_internal && is_orphan_vg(vginfo->vgname))
continue;
if (!(vgnl = dm_pool_alloc(cmd->mem, sizeof(*vgnl)))) {
log_error("vgnameid_list allocation failed.");
return 0;
}
vgnl->vgid = dm_pool_strdup(cmd->mem, vginfo->vgid);
vgnl->vg_name = dm_pool_strdup(cmd->mem, vginfo->vgname);
if (!vgnl->vgid || !vgnl->vg_name) {
log_error("vgnameid_list member allocation failed.");
return 0;
}
dm_list_add(vgnameids, &vgnl->list);
}
return 1;
}
struct dm_list *lvmcache_get_vgids(struct cmd_context *cmd,
int include_internal)
{
struct dm_list *vgids;
struct lvmcache_vginfo *vginfo;
// TODO plug into lvmetad here automagically?
lvmcache_label_scan(cmd, 0);
if (!(vgids = str_list_create(cmd->mem))) {
log_error("vgids list allocation failed");
return NULL;
}
dm_list_iterate_items(vginfo, &_vginfos) {
if (!include_internal && is_orphan_vg(vginfo->vgname))
continue;
if (!str_list_add(cmd->mem, vgids,
dm_pool_strdup(cmd->mem, vginfo->vgid))) {
log_error("strlist allocation failed");
return NULL;
}
}
return vgids;
}
struct dm_list *lvmcache_get_vgnames(struct cmd_context *cmd,
int include_internal)
{
struct dm_list *vgnames;
struct lvmcache_vginfo *vginfo;
lvmcache_label_scan(cmd, 0);
if (!(vgnames = str_list_create(cmd->mem))) {
log_errno(ENOMEM, "vgnames list allocation failed");
return NULL;
}
dm_list_iterate_items(vginfo, &_vginfos) {
if (!include_internal && is_orphan_vg(vginfo->vgname))
continue;
if (!str_list_add(cmd->mem, vgnames,
dm_pool_strdup(cmd->mem, vginfo->vgname))) {
log_errno(ENOMEM, "strlist allocation failed");
return NULL;
}
}
return vgnames;
}
struct dm_list *lvmcache_get_pvids(struct cmd_context *cmd, const char *vgname,
const char *vgid)
{
struct dm_list *pvids;
struct lvmcache_vginfo *vginfo;
struct lvmcache_info *info;
if (!(pvids = str_list_create(cmd->mem))) {
log_error("pvids list allocation failed");
return NULL;
}
if (!(vginfo = lvmcache_vginfo_from_vgname(vgname, vgid)))
return pvids;
dm_list_iterate_items(info, &vginfo->infos) {
if (!str_list_add(cmd->mem, pvids,
dm_pool_strdup(cmd->mem, info->dev->pvid))) {
log_error("strlist allocation failed");
return NULL;
}
}
return pvids;
}
static struct device *_device_from_pvid(const struct id *pvid,
uint64_t *label_sector)
{
struct lvmcache_info *info;
struct label *label;
if ((info = lvmcache_info_from_pvid((const char *) pvid, 0))) {
if (lvmetad_active()) {
if (info->label && label_sector)
*label_sector = info->label->sector;
return info->dev;
}
if (label_read(info->dev, &label, UINT64_C(0))) {
info = (struct lvmcache_info *) label->info;
if (id_equal(pvid, (struct id *) &info->dev->pvid)) {
if (label_sector)
*label_sector = label->sector;
return info->dev;
}
}
}
return NULL;
}
struct device *lvmcache_device_from_pvid(struct cmd_context *cmd, const struct id *pvid,
unsigned *scan_done_once, uint64_t *label_sector)
{
struct device *dev;
/* Already cached ? */
dev = _device_from_pvid(pvid, label_sector);
if (dev)
return dev;
lvmcache_label_scan(cmd, 0);
/* Try again */
dev = _device_from_pvid(pvid, label_sector);
if (dev)
return dev;
if (critical_section() || (scan_done_once && *scan_done_once))
return NULL;
lvmcache_label_scan(cmd, 2);
if (scan_done_once)
*scan_done_once = 1;
/* Try again */
dev = _device_from_pvid(pvid, label_sector);
if (dev)
return dev;
return NULL;
}
const char *lvmcache_pvid_from_devname(struct cmd_context *cmd,
const char *devname)
{
struct device *dev;
struct label *label;
if (!(dev = dev_cache_get(devname, cmd->filter))) {
log_error("%s: Couldn't find device. Check your filters?",
devname);
return NULL;
}
if (!(label_read(dev, &label, UINT64_C(0))))
return NULL;
return dev->pvid;
}
static int _free_vginfo(struct lvmcache_vginfo *vginfo)
{
struct lvmcache_vginfo *primary_vginfo, *vginfo2;
int r = 1;
_free_cached_vgmetadata(vginfo);
vginfo2 = primary_vginfo = lvmcache_vginfo_from_vgname(vginfo->vgname, NULL);
if (vginfo == primary_vginfo) {
dm_hash_remove(_vgname_hash, vginfo->vgname);
if (vginfo->next && !dm_hash_insert(_vgname_hash, vginfo->vgname,
vginfo->next)) {
log_error("_vgname_hash re-insertion for %s failed",
vginfo->vgname);
r = 0;
}
} else
while (vginfo2) {
if (vginfo2->next == vginfo) {
vginfo2->next = vginfo->next;
break;
}
vginfo2 = vginfo2->next;
}
dm_free(vginfo->vgname);
dm_free(vginfo->creation_host);
if (*vginfo->vgid && _vgid_hash &&
lvmcache_vginfo_from_vgid(vginfo->vgid) == vginfo)
dm_hash_remove(_vgid_hash, vginfo->vgid);
dm_list_del(&vginfo->list);
dm_free(vginfo);
return r;
}
/*
* vginfo must be info->vginfo unless info is NULL
*/
static int _drop_vginfo(struct lvmcache_info *info, struct lvmcache_vginfo *vginfo)
{
if (info)
_vginfo_detach_info(info);
/* vginfo still referenced? */
if (!vginfo || is_orphan_vg(vginfo->vgname) ||
!dm_list_empty(&vginfo->infos))
return 1;
if (!_free_vginfo(vginfo))
return_0;
return 1;
}
void lvmcache_del(struct lvmcache_info *info)
{
if (info->dev->pvid[0] && _pvid_hash)
dm_hash_remove(_pvid_hash, info->dev->pvid);
_drop_vginfo(info, info->vginfo);
info->label->labeller->ops->destroy_label(info->label->labeller,
info->label);
dm_free(info);
return;
}
static int _lvmcache_update_pvid(struct lvmcache_info *info, const char *pvid)
{
/*
* Nothing to do if already stored with same pvid.
*/
if (((dm_hash_lookup(_pvid_hash, pvid)) == info) &&
!strcmp(info->dev->pvid, pvid))
return 1;
if (*info->dev->pvid)
dm_hash_remove(_pvid_hash, info->dev->pvid);
strncpy(info->dev->pvid, pvid, sizeof(info->dev->pvid));
if (!dm_hash_insert(_pvid_hash, pvid, info)) {
log_error("_lvmcache_update: pvid insertion failed: %s", pvid);
return 0;
}
return 1;
}
/*
* vginfo must be info->vginfo unless info is NULL (orphans)
*/
static int _lvmcache_update_vgid(struct lvmcache_info *info,
struct lvmcache_vginfo *vginfo,
const char *vgid)
{
if (!vgid || !vginfo ||
!strncmp(vginfo->vgid, vgid, ID_LEN))
return 1;
if (vginfo && *vginfo->vgid)
dm_hash_remove(_vgid_hash, vginfo->vgid);
if (!vgid) {
/* FIXME: unreachable code path */
log_debug_cache("lvmcache: %s: clearing VGID", info ? dev_name(info->dev) : vginfo->vgname);
return 1;
}
strncpy(vginfo->vgid, vgid, ID_LEN);
vginfo->vgid[ID_LEN] = '\0';
if (!dm_hash_insert(_vgid_hash, vginfo->vgid, vginfo)) {
log_error("_lvmcache_update: vgid hash insertion failed: %s",
vginfo->vgid);
return 0;
}
if (!is_orphan_vg(vginfo->vgname))
log_debug_cache("lvmcache: %s: setting %s VGID to %s",
(info) ? dev_name(info->dev) : "",
vginfo->vgname, vginfo->vgid);
return 1;
}
static int _insert_vginfo(struct lvmcache_vginfo *new_vginfo, const char *vgid,
uint32_t vgstatus, const char *creation_host,
struct lvmcache_vginfo *primary_vginfo)
{
struct lvmcache_vginfo *last_vginfo = primary_vginfo;
char uuid_primary[64] __attribute__((aligned(8)));
char uuid_new[64] __attribute__((aligned(8)));
int use_new = 0;
/* Pre-existing VG takes precedence. Unexported VG takes precedence. */
if (primary_vginfo) {
if (!id_write_format((const struct id *)vgid, uuid_new, sizeof(uuid_new)))
return_0;
if (!id_write_format((const struct id *)&primary_vginfo->vgid, uuid_primary,
sizeof(uuid_primary)))
return_0;
/*
* If Primary not exported, new exported => keep
* Else Primary exported, new not exported => change
* Else Primary has hostname for this machine => keep
* Else Primary has no hostname, new has one => change
* Else New has hostname for this machine => change
* Else Keep primary.
*/
if (!(primary_vginfo->status & EXPORTED_VG) &&
(vgstatus & EXPORTED_VG))
log_warn("WARNING: Duplicate VG name %s: "
"Existing %s takes precedence over "
"exported %s", new_vginfo->vgname,
uuid_primary, uuid_new);
else if ((primary_vginfo->status & EXPORTED_VG) &&
!(vgstatus & EXPORTED_VG)) {
log_warn("WARNING: Duplicate VG name %s: "
"%s takes precedence over exported %s",
new_vginfo->vgname, uuid_new,
uuid_primary);
use_new = 1;
} else if (primary_vginfo->creation_host &&
!strcmp(primary_vginfo->creation_host,
primary_vginfo->fmt->cmd->hostname))
log_warn("WARNING: Duplicate VG name %s: "
"Existing %s (created here) takes precedence "
"over %s", new_vginfo->vgname, uuid_primary,
uuid_new);
else if (!primary_vginfo->creation_host && creation_host) {
log_warn("WARNING: Duplicate VG name %s: "
"%s (with creation_host) takes precedence over %s",
new_vginfo->vgname, uuid_new,
uuid_primary);
use_new = 1;
} else if (creation_host &&
!strcmp(creation_host,
primary_vginfo->fmt->cmd->hostname)) {
log_warn("WARNING: Duplicate VG name %s: "
"%s (created here) takes precedence over %s",
new_vginfo->vgname, uuid_new,
uuid_primary);
use_new = 1;
}
if (!use_new) {
while (last_vginfo->next)
last_vginfo = last_vginfo->next;
last_vginfo->next = new_vginfo;
return 1;
}
dm_hash_remove(_vgname_hash, primary_vginfo->vgname);
}
if (!dm_hash_insert(_vgname_hash, new_vginfo->vgname, new_vginfo)) {
log_error("cache_update: vg hash insertion failed: %s",
new_vginfo->vgname);
return 0;
}
if (primary_vginfo)
new_vginfo->next = primary_vginfo;
return 1;
}
static int _lvmcache_update_vgname(struct lvmcache_info *info,
const char *vgname, const char *vgid,
uint32_t vgstatus, const char *creation_host,
const struct format_type *fmt)
{
struct lvmcache_vginfo *vginfo, *primary_vginfo, *orphan_vginfo;
struct lvmcache_info *info2, *info3;
char mdabuf[32];
// struct lvmcache_vginfo *old_vginfo, *next;
if (!vgname || (info && info->vginfo && !strcmp(info->vginfo->vgname, vgname)))
return 1;
/* Remove existing vginfo entry */
if (info)
_drop_vginfo(info, info->vginfo);
/* Get existing vginfo or create new one */
if (!(vginfo = lvmcache_vginfo_from_vgname(vgname, vgid))) {
/*** FIXME - vginfo ends up duplicated instead of renamed.
// Renaming? This lookup fails.
if ((vginfo = vginfo_from_vgid(vgid))) {
next = vginfo->next;
old_vginfo = vginfo_from_vgname(vginfo->vgname, NULL);
if (old_vginfo == vginfo) {
dm_hash_remove(_vgname_hash, old_vginfo->vgname);
if (old_vginfo->next) {
if (!dm_hash_insert(_vgname_hash, old_vginfo->vgname, old_vginfo->next)) {
log_error("vg hash re-insertion failed: %s",
old_vginfo->vgname);
return 0;
}
}
} else do {
if (old_vginfo->next == vginfo) {
old_vginfo->next = vginfo->next;
break;
}
} while ((old_vginfo = old_vginfo->next));
vginfo->next = NULL;
dm_free(vginfo->vgname);
if (!(vginfo->vgname = dm_strdup(vgname))) {
log_error("cache vgname alloc failed for %s", vgname);
return 0;
}
// Rename so can assume new name does not already exist
if (!dm_hash_insert(_vgname_hash, vginfo->vgname, vginfo->next)) {
log_error("vg hash re-insertion failed: %s",
vginfo->vgname);
return 0;
}
} else {
***/
if (!(vginfo = dm_zalloc(sizeof(*vginfo)))) {
log_error("lvmcache_update_vgname: list alloc failed");
return 0;
}
if (!(vginfo->vgname = dm_strdup(vgname))) {
dm_free(vginfo);
log_error("cache vgname alloc failed for %s", vgname);
return 0;
}
dm_list_init(&vginfo->infos);
/*
* If we're scanning and there's an invalidated entry, remove it.
* Otherwise we risk bogus warnings of duplicate VGs.
*/
while ((primary_vginfo = lvmcache_vginfo_from_vgname(vgname, NULL)) &&
_scanning_in_progress && _vginfo_is_invalid(primary_vginfo)) {
orphan_vginfo = lvmcache_vginfo_from_vgname(primary_vginfo->fmt->orphan_vg_name, NULL);
if (!orphan_vginfo) {
log_error(INTERNAL_ERROR "Orphan vginfo %s lost from cache.",
primary_vginfo->fmt->orphan_vg_name);
dm_free(vginfo->vgname);
dm_free(vginfo);
return 0;
}
dm_list_iterate_items_safe(info2, info3, &primary_vginfo->infos) {
_vginfo_detach_info(info2);
_vginfo_attach_info(orphan_vginfo, info2);
if (info2->mdas.n)
sprintf(mdabuf, " with %u mdas",
dm_list_size(&info2->mdas));
else
mdabuf[0] = '\0';
log_debug_cache("lvmcache: %s: now in VG %s%s%s%s%s",
dev_name(info2->dev),
vgname, orphan_vginfo->vgid[0] ? " (" : "",
orphan_vginfo->vgid[0] ? orphan_vginfo->vgid : "",
orphan_vginfo->vgid[0] ? ")" : "", mdabuf);
}
if (!_drop_vginfo(NULL, primary_vginfo))
return_0;
}
if (!_insert_vginfo(vginfo, vgid, vgstatus, creation_host,
primary_vginfo)) {
dm_free(vginfo->vgname);
dm_free(vginfo);
return 0;
}
/* Ensure orphans appear last on list_iterate */
if (is_orphan_vg(vgname))
dm_list_add(&_vginfos, &vginfo->list);
else
dm_list_add_h(&_vginfos, &vginfo->list);
/***
}
***/
}
if (info)
_vginfo_attach_info(vginfo, info);
else if (!_lvmcache_update_vgid(NULL, vginfo, vgid)) /* Orphans */
return_0;
_update_cache_vginfo_lock_state(vginfo, lvmcache_vgname_is_locked(vgname));
/* FIXME Check consistency of list! */
vginfo->fmt = fmt;
if (info) {
if (info->mdas.n)
sprintf(mdabuf, " with %u mdas", dm_list_size(&info->mdas));
else
mdabuf[0] = '\0';
log_debug_cache("lvmcache: %s: now in VG %s%s%s%s%s",
dev_name(info->dev),
vgname, vginfo->vgid[0] ? " (" : "",
vginfo->vgid[0] ? vginfo->vgid : "",
vginfo->vgid[0] ? ")" : "", mdabuf);
} else
log_debug_cache("lvmcache: initialised VG %s", vgname);
return 1;
}
static int _lvmcache_update_vgstatus(struct lvmcache_info *info, uint32_t vgstatus,
const char *creation_host)
{
if (!info || !info->vginfo)
return 1;
if ((info->vginfo->status & EXPORTED_VG) != (vgstatus & EXPORTED_VG))
log_debug_cache("lvmcache: %s: VG %s %s exported",
dev_name(info->dev), info->vginfo->vgname,
vgstatus & EXPORTED_VG ? "now" : "no longer");
info->vginfo->status = vgstatus;
if (!creation_host)
return 1;
if (info->vginfo->creation_host && !strcmp(creation_host,
info->vginfo->creation_host))
return 1;
if (info->vginfo->creation_host)
dm_free(info->vginfo->creation_host);
if (!(info->vginfo->creation_host = dm_strdup(creation_host))) {
log_error("cache creation host alloc failed for %s",
creation_host);
return 0;
}
log_debug_cache("lvmcache: %s: VG %s: Set creation host to %s.",
dev_name(info->dev), info->vginfo->vgname, creation_host);
return 1;
}
static int _lvmcache_update_vg_mda_info(struct lvmcache_info *info, uint32_t mda_checksum,
size_t mda_size)
{
if (!info || !info->vginfo || !mda_size)
return 1;
if (info->vginfo->mda_checksum == mda_checksum || info->vginfo->mda_size == mda_size)
return 1;
info->vginfo->mda_checksum = mda_checksum;
info->vginfo->mda_size = mda_size;
/* FIXME Add checksum index */
log_debug_cache("lvmcache: %s: VG %s: Stored metadata checksum %" PRIu32 " with size %" PRIsize_t ".",
dev_name(info->dev), info->vginfo->vgname, mda_checksum, mda_size);
return 1;
}
int lvmcache_add_orphan_vginfo(const char *vgname, struct format_type *fmt)
{
if (!_lock_hash && !lvmcache_init()) {
log_error("Internal cache initialisation failed");
return 0;
}
return _lvmcache_update_vgname(NULL, vgname, vgname, 0, "", fmt);
}
int lvmcache_update_vgname_and_id(struct lvmcache_info *info, struct lvmcache_vgsummary *vgsummary)
{
const char *vgname = vgsummary->vgname;
const char *vgid = (char *)&vgsummary->vgid;
if (!vgname && !info->vginfo) {
log_error(INTERNAL_ERROR "NULL vgname handed to cache");
/* FIXME Remove this */
vgname = info->fmt->orphan_vg_name;
vgid = vgname;
}
/* When using lvmetad, the PV could not have become orphaned. */
if (lvmetad_active() && is_orphan_vg(vgname) && info->vginfo)
return 1;
/* If PV without mdas is already in a real VG, don't make it orphan */
if (is_orphan_vg(vgname) && info->vginfo &&
mdas_empty_or_ignored(&info->mdas) &&
!is_orphan_vg(info->vginfo->vgname) && critical_section())
return 1;
/* If making a PV into an orphan, any cached VG metadata may become
* invalid, incorrectly still referencing device structs.
* (Example: pvcreate -ff) */
if (is_orphan_vg(vgname) && info->vginfo && !is_orphan_vg(info->vginfo->vgname))
info->vginfo->cached_vg_invalidated = 1;
/* If moving PV from orphan to real VG, always mark it valid */
if (!is_orphan_vg(vgname))
info->status &= ~CACHE_INVALID;
if (!_lvmcache_update_vgname(info, vgname, vgid, vgsummary->vgstatus,
vgsummary->creation_host, info->fmt) ||
!_lvmcache_update_vgid(info, info->vginfo, vgid) ||
!_lvmcache_update_vgstatus(info, vgsummary->vgstatus, vgsummary->creation_host) ||
!_lvmcache_update_vg_mda_info(info, vgsummary->mda_checksum, vgsummary->mda_size))
return_0;
return 1;
}
int lvmcache_update_vg(struct volume_group *vg, unsigned precommitted)
{
struct pv_list *pvl;
struct lvmcache_info *info;
char pvid_s[ID_LEN + 1] __attribute__((aligned(8)));
struct lvmcache_vgsummary vgsummary = {
.vgname = vg->name,
.vgstatus = vg->status,
.vgid = vg->id
};
pvid_s[sizeof(pvid_s) - 1] = '\0';
dm_list_iterate_items(pvl, &vg->pvs) {
strncpy(pvid_s, (char *) &pvl->pv->id, sizeof(pvid_s) - 1);
/* FIXME Could pvl->pv->dev->pvid ever be different? */
if ((info = lvmcache_info_from_pvid(pvid_s, 0)) &&
!lvmcache_update_vgname_and_id(info, &vgsummary))
return_0;
}
/* store text representation of vg to cache */
if (vg->cmd->current_settings.cache_vgmetadata)
_store_metadata(vg, precommitted);
return 1;
}
/*
* Replace pv->dev with dev so that dev will appear for reporting.
*/
void lvmcache_replace_dev(struct cmd_context *cmd, struct physical_volume *pv,
struct device *dev)
{
struct lvmcache_info *info;
char pvid_s[ID_LEN + 1] __attribute__((aligned(8)));
strncpy(pvid_s, (char *) &pv->id, sizeof(pvid_s) - 1);
pvid_s[sizeof(pvid_s) - 1] = '\0';
if (!(info = lvmcache_info_from_pvid(pvid_s, 0)))
return;
info->dev = dev;
info->label->dev = dev;
pv->dev = dev;
}
/*
* We can see multiple different devices with the
* same pvid, i.e. duplicates.
*
* There may be different reasons for seeing two
* devices with the same pvid:
* - multipath showing two paths to the same thing
* - one device copied to another, e.g. with dd,
* also referred to as cloned devices.
* - a "subsystem" taking a device and creating
* another device of its own that represents the
* underlying device it is using, e.g. using dm
* to create an identity mapping of a PV.
*
* Given duplicate devices, we have to choose one
* of them to be the "preferred" dev, i.e. the one
* that will be referenced in lvmcache, by pv->dev.
* We can keep the existing dev, that's currently
* used in lvmcache, or we can replace the existing
* dev with the new duplicate.
*
* Regardless of which device is preferred, we need
* to print messages explaining which devices were
* found so that a user can sort out for themselves
* what has happened if the preferred device is not
* the one they are interested in.
*
* If a user wants to use the non-preferred device,
* they will need to filter out the device that
* lvm is preferring.
*
* The dev_subsystem calls check if the major number
* of the dev is part of a subsystem like DM/MD/DRBD.
* A dev that's part of a subsystem is preferred over a
* duplicate of that dev that is not part of a
* subsystem.
*
* The has_holders calls check if the device is being
* used by another, and prefers one that's being used.
*
* FIXME: why do we prefer a device without holders
* over a device with holders? We should understand
* the reason for that choice.
*
* FIXME: there may be other reasons to prefer one
* device over another:
*
* . are there other use/open counts we could check
* beyond the holders?
*
* . check if either is bad/usable and prefer
* the good one?
*
* . prefer the one with smaller minor number?
* Might avoid disturbing things due to a new
* transient duplicate?
*/
struct lvmcache_info *lvmcache_add(struct labeller *labeller, const char *pvid,
struct device *dev,
const char *vgname, const char *vgid,
uint32_t vgstatus)
{
const struct format_type *fmt = labeller->fmt;
struct dev_types *dt = fmt->cmd->dev_types;
struct label *label;
struct lvmcache_info *existing, *info;
char pvid_s[ID_LEN + 1] __attribute__((aligned(8)));
struct lvmcache_vgsummary vgsummary = {
.vgname = vgname,
.vgstatus = vgstatus,
};
/* N.B. vgid is not NUL-terminated when called from _text_pv_write */
if (vgid)
strncpy((char *)&vgsummary.vgid, vgid, sizeof(vgsummary.vgid));
if (!_vgname_hash && !lvmcache_init()) {
log_error("Internal cache initialisation failed");
return NULL;
}
strncpy(pvid_s, pvid, sizeof(pvid_s) - 1);
pvid_s[sizeof(pvid_s) - 1] = '\0';
if (!(existing = lvmcache_info_from_pvid(pvid_s, 0)) &&
!(existing = lvmcache_info_from_pvid(dev->pvid, 0))) {
if (!(label = label_create(labeller)))
return_NULL;
if (!(info = dm_zalloc(sizeof(*info)))) {
log_error("lvmcache_info allocation failed");
label_destroy(label);
return NULL;
}
label->info = info;
info->label = label;
dm_list_init(&info->list);
info->dev = dev;
lvmcache_del_mdas(info);
lvmcache_del_das(info);
lvmcache_del_bas(info);
} else {
if (existing->dev != dev) {
int old_in_subsystem = 0;
int new_in_subsystem = 0;
int old_is_dm = 0;
int new_is_dm = 0;
int old_has_holders = 0;
int new_has_holders = 0;
/*
* Here are different devices with the same pvid:
* duplicates. See comment above.
*/
/*
* This flag tells the process_each_pv code to search
* the devices list for duplicates, so that devices
* can be processed together with their duplicates
* (while processing the VG, rather than reporting
* pv->dev under the VG, and its duplicate outside
* the VG context.)
*/
_found_duplicate_pvs = 1;
/*
* The new dev may not have pvid set.
* The process_each_pv code needs to have the pvid
* set in each device to detect that the devices
* are duplicates.
*/
strncpy(dev->pvid, pvid_s, sizeof(dev->pvid));
/*
* Now decide if we are going to ignore the new
* device, or replace the existing/old device in
* lvmcache with the new one.
*/
old_in_subsystem = dev_subsystem_part_major(dt, existing->dev);
new_in_subsystem = dev_subsystem_part_major(dt, dev);
old_is_dm = dm_is_dm_major(MAJOR(existing->dev->dev));
new_is_dm = dm_is_dm_major(MAJOR(dev->dev));
old_has_holders = dm_device_has_holders(MAJOR(existing->dev->dev), MINOR(existing->dev->dev));
new_has_holders = dm_device_has_holders(MAJOR(dev->dev), MINOR(dev->dev));
if (old_has_holders && new_has_holders) {
/*
* This is not a selection of old or new, but
* just a warning to be aware of.
*/
log_warn("WARNING: duplicate PV %s is being used from both devices %s and %s",
pvid_s,
dev_name(existing->dev),
dev_name(dev));
}
if (existing->vginfo->preferred_duplicates) {
/*
* The preferred duplicate devs have already
* been chosen during a previous populating of
* lvmcache, so just use the existing preferences.
*/
log_verbose("Found duplicate PV %s: using existing dev %s",
pvid_s,
dev_name(existing->dev));
return NULL;
}
if (old_in_subsystem && !new_in_subsystem) {
/* Use old, ignore new. */
log_warn("Found duplicate PV %s: using %s not %s",
pvid_s,
dev_name(existing->dev),
dev_name(dev));
log_warn("Using duplicate PV %s from subsystem %s, ignoring %s",
dev_name(existing->dev),
dev_subsystem_name(dt, existing->dev),
dev_name(dev));
return NULL;
} else if (!old_in_subsystem && new_in_subsystem) {
/* Use new, replace old. */
log_warn("Found duplicate PV %s: using %s not %s",
pvid_s,
dev_name(dev),
dev_name(existing->dev));
log_warn("Using duplicate PV %s from subsystem %s, replacing %s",
dev_name(dev),
dev_subsystem_name(dt, dev),
dev_name(existing->dev));
} else if (old_has_holders && !new_has_holders) {
/* Use new, replace old. */
/* FIXME: why choose the one without olders? */
log_warn("Found duplicate PV %s: using %s not %s",
pvid_s,
dev_name(dev),
dev_name(existing->dev));
log_warn("Using duplicate PV %s without holders, replacing %s",
dev_name(dev),
dev_name(existing->dev));
} else if (!old_has_holders && new_has_holders) {
/* Use old, ignore new. */
log_warn("Found duplicate PV %s: using %s not %s",
pvid_s,
dev_name(existing->dev),
dev_name(dev));
log_warn("Using duplicate PV %s without holders, ignoring %s",
dev_name(existing->dev),
dev_name(dev));
return NULL;
} else if (old_is_dm && new_is_dm) {
/* Use new, replace old. */
/* FIXME: why choose the new instead of the old? */
log_warn("Found duplicate PV %s: using %s not %s",
pvid_s,
dev_name(dev),
dev_name(existing->dev));
log_warn("Using duplicate PV %s which is last seen, replacing %s",
dev_name(dev),
dev_name(existing->dev));
} else if (!strcmp(pvid_s, existing->dev->pvid)) {
/* No criteria to use for preferring old or new. */
/* FIXME: why choose the new instead of the old? */
/* FIXME: a transient duplicate would be a reason
* to select the old instead of the new. */
log_warn("Found duplicate PV %s: using %s not %s",
pvid_s,
dev_name(dev),
dev_name(existing->dev));
log_warn("Using duplicate PV %s which is last seen, replacing %s",
dev_name(dev),
dev_name(existing->dev));
}
} else {
/*
* The new dev is the same as the existing dev.
*
* FIXME: Why can't we just return NULL here if the
* device already exists? Things don't seem to work
* if we do that for some reason.
*/
log_verbose("Found same device %s with same pvid %s",
dev_name(existing->dev), pvid_s);
}
/*
* FIXME: when could this ever happen?
* If this does happen, identify when/why here, and
* if not, remove this code.
*/
if (strcmp(pvid_s, existing->dev->pvid)) {
log_warn("Replacing dev %s pvid %s with dev %s pvid %s",
dev_name(existing->dev), existing->dev->pvid,
dev_name(dev), pvid_s);
}
/*
* Switch over to new preferred device.
*/
existing->dev = dev;
info = existing;
/* Has labeller changed? */
if (info->label->labeller != labeller) {
label_destroy(info->label);
if (!(info->label = label_create(labeller)))
/* FIXME leaves info without label! */
return_NULL;
info->label->info = info;
}
label = info->label;
}
info->fmt = labeller->fmt;
info->status |= CACHE_INVALID;
if (!_lvmcache_update_pvid(info, pvid_s)) {
if (!existing) {
dm_free(info);
label_destroy(label);
}
return NULL;
}
if (!lvmcache_update_vgname_and_id(info, &vgsummary)) {
if (!existing) {
dm_hash_remove(_pvid_hash, pvid_s);
strcpy(info->dev->pvid, "");
dm_free(info);
label_destroy(label);
}
return NULL;
}
return info;
}
static void _lvmcache_destroy_entry(struct lvmcache_info *info)
{
_vginfo_detach_info(info);
info->dev->pvid[0] = 0;
label_destroy(info->label);
dm_free(info);
}
static void _lvmcache_destroy_vgnamelist(struct lvmcache_vginfo *vginfo)
{
struct lvmcache_vginfo *next;
do {
next = vginfo->next;
if (!_free_vginfo(vginfo))
stack;
} while ((vginfo = next));
}
static void _lvmcache_destroy_lockname(struct dm_hash_node *n)
{
char *vgname;
if (!dm_hash_get_data(_lock_hash, n))
return;
vgname = dm_hash_get_key(_lock_hash, n);
if (!strcmp(vgname, VG_GLOBAL))
_vg_global_lock_held = 1;
else
log_error(INTERNAL_ERROR "Volume Group %s was not unlocked",
dm_hash_get_key(_lock_hash, n));
}
void lvmcache_destroy(struct cmd_context *cmd, int retain_orphans, int reset)
{
struct dm_hash_node *n;
log_verbose("Wiping internal VG cache");
_has_scanned = 0;
if (_vgid_hash) {
dm_hash_destroy(_vgid_hash);
_vgid_hash = NULL;
}
if (_pvid_hash) {
dm_hash_iter(_pvid_hash, (dm_hash_iterate_fn) _lvmcache_destroy_entry);
dm_hash_destroy(_pvid_hash);
_pvid_hash = NULL;
}
if (_vgname_hash) {
dm_hash_iter(_vgname_hash,
(dm_hash_iterate_fn) _lvmcache_destroy_vgnamelist);
dm_hash_destroy(_vgname_hash);
_vgname_hash = NULL;
}
if (_lock_hash) {
if (reset)
_vg_global_lock_held = 0;
else
dm_hash_iterate(n, _lock_hash)
_lvmcache_destroy_lockname(n);
dm_hash_destroy(_lock_hash);
_lock_hash = NULL;
}
if (!dm_list_empty(&_vginfos))
log_error(INTERNAL_ERROR "_vginfos list should be empty");
dm_list_init(&_vginfos);
if (retain_orphans)
if (!init_lvmcache_orphans(cmd))
stack;
}
int lvmcache_pvid_is_locked(const char *pvid) {
struct lvmcache_info *info;
info = lvmcache_info_from_pvid(pvid, 0);
if (!info || !info->vginfo)
return 0;
return lvmcache_vgname_is_locked(info->vginfo->vgname);
}
int lvmcache_fid_add_mdas(struct lvmcache_info *info, struct format_instance *fid,
const char *id, int id_len)
{
return fid_add_mdas(fid, &info->mdas, id, id_len);
}
int lvmcache_fid_add_mdas_pv(struct lvmcache_info *info, struct format_instance *fid)
{
return lvmcache_fid_add_mdas(info, fid, info->dev->pvid, ID_LEN);
}
int lvmcache_fid_add_mdas_vg(struct lvmcache_vginfo *vginfo, struct format_instance *fid)
{
struct lvmcache_info *info;
dm_list_iterate_items(info, &vginfo->infos) {
if (!lvmcache_fid_add_mdas_pv(info, fid))
return_0;
}
return 1;
}
static int _get_pv_if_in_vg(struct lvmcache_info *info,
struct physical_volume *pv)
{
char vgname[NAME_LEN + 1];
char vgid[ID_LEN + 1];
if (info->vginfo && info->vginfo->vgname &&
!is_orphan_vg(info->vginfo->vgname)) {
/*
* get_pv_from_vg_by_id() may call
* lvmcache_label_scan() and drop cached
* vginfo so make a local copy of string.
*/
(void) dm_strncpy(vgname, info->vginfo->vgname, sizeof(vgname));
memcpy(vgid, info->vginfo->vgid, sizeof(vgid));
if (get_pv_from_vg_by_id(info->fmt, vgname, vgid,
info->dev->pvid, pv))
return 1;
}
return 0;
}
int lvmcache_populate_pv_fields(struct lvmcache_info *info,
struct physical_volume *pv,
int scan_label_only)
{
struct data_area_list *da;
/* Have we already cached vgname? */
if (!scan_label_only && _get_pv_if_in_vg(info, pv))
return 1;
/* Perform full scan (just the first time) and try again */
if (!scan_label_only && !critical_section() && !full_scan_done()) {
lvmcache_label_scan(info->fmt->cmd, 2);
if (_get_pv_if_in_vg(info, pv))
return 1;
}
/* Orphan */
pv->dev = info->dev;
pv->fmt = info->fmt;
pv->size = info->device_size >> SECTOR_SHIFT;
pv->vg_name = FMT_TEXT_ORPHAN_VG_NAME;
memcpy(&pv->id, &info->dev->pvid, sizeof(pv->id));
/* Currently only support exactly one data area */
if (dm_list_size(&info->das) != 1) {
log_error("Must be exactly one data area (found %d) on PV %s",
dm_list_size(&info->das), dev_name(info->dev));
return 0;
}
/* Currently only support one bootloader area at most */
if (dm_list_size(&info->bas) > 1) {
log_error("Must be at most one bootloader area (found %d) on PV %s",
dm_list_size(&info->bas), dev_name(info->dev));
return 0;
}
dm_list_iterate_items(da, &info->das)
pv->pe_start = da->disk_locn.offset >> SECTOR_SHIFT;
dm_list_iterate_items(da, &info->bas) {
pv->ba_start = da->disk_locn.offset >> SECTOR_SHIFT;
pv->ba_size = da->disk_locn.size >> SECTOR_SHIFT;
}
return 1;
}
int lvmcache_check_format(struct lvmcache_info *info, const struct format_type *fmt)
{
if (info->fmt != fmt) {
log_error("PV %s is a different format (seqno %s)",
dev_name(info->dev), info->fmt->name);
return 0;
}
return 1;
}
void lvmcache_del_mdas(struct lvmcache_info *info)
{
if (info->mdas.n)
del_mdas(&info->mdas);
dm_list_init(&info->mdas);
}
void lvmcache_del_das(struct lvmcache_info *info)
{
if (info->das.n)
del_das(&info->das);
dm_list_init(&info->das);
}
void lvmcache_del_bas(struct lvmcache_info *info)
{
if (info->bas.n)
del_bas(&info->bas);
dm_list_init(&info->bas);
}
int lvmcache_add_mda(struct lvmcache_info *info, struct device *dev,
uint64_t start, uint64_t size, unsigned ignored)
{
return add_mda(info->fmt, NULL, &info->mdas, dev, start, size, ignored);
}
int lvmcache_add_da(struct lvmcache_info *info, uint64_t start, uint64_t size)
{
return add_da(NULL, &info->das, start, size);
}
int lvmcache_add_ba(struct lvmcache_info *info, uint64_t start, uint64_t size)
{
return add_ba(NULL, &info->bas, start, size);
}
void lvmcache_update_pv(struct lvmcache_info *info, struct physical_volume *pv,
const struct format_type *fmt)
{
info->device_size = pv->size << SECTOR_SHIFT;
info->fmt = fmt;
}
int lvmcache_update_das(struct lvmcache_info *info, struct physical_volume *pv)
{
struct data_area_list *da;
if (info->das.n) {
if (!pv->pe_start)
dm_list_iterate_items(da, &info->das)
pv->pe_start = da->disk_locn.offset >> SECTOR_SHIFT;
del_das(&info->das);
} else
dm_list_init(&info->das);
if (!add_da(NULL, &info->das, pv->pe_start << SECTOR_SHIFT, 0 /*pv->size << SECTOR_SHIFT*/))
return_0;
return 1;
}
int lvmcache_update_bas(struct lvmcache_info *info, struct physical_volume *pv)
{
struct data_area_list *ba;
if (info->bas.n) {
if (!pv->ba_start && !pv->ba_size)
dm_list_iterate_items(ba, &info->bas) {
pv->ba_start = ba->disk_locn.offset >> SECTOR_SHIFT;
pv->ba_size = ba->disk_locn.size >> SECTOR_SHIFT;
}
del_das(&info->bas);
} else
dm_list_init(&info->bas);
if (!add_ba(NULL, &info->bas, pv->ba_start << SECTOR_SHIFT, pv->ba_size << SECTOR_SHIFT))
return_0;
return 1;
}
int lvmcache_foreach_pv(struct lvmcache_vginfo *vginfo,
int (*fun)(struct lvmcache_info *, void *),
void *baton)
{
struct lvmcache_info *info;
dm_list_iterate_items(info, &vginfo->infos) {
if (!fun(info, baton))
return_0;
}
return 1;
}
int lvmcache_foreach_mda(struct lvmcache_info *info,
int (*fun)(struct metadata_area *, void *),
void *baton)
{
struct metadata_area *mda;
dm_list_iterate_items(mda, &info->mdas) {
if (!fun(mda, baton))
return_0;
}
return 1;
}
unsigned lvmcache_mda_count(struct lvmcache_info *info)
{
return dm_list_size(&info->mdas);
}
int lvmcache_foreach_da(struct lvmcache_info *info,
int (*fun)(struct disk_locn *, void *),
void *baton)
{
struct data_area_list *da;
dm_list_iterate_items(da, &info->das) {
if (!fun(&da->disk_locn, baton))
return_0;
}
return 1;
}
int lvmcache_foreach_ba(struct lvmcache_info *info,
int (*fun)(struct disk_locn *, void *),
void *baton)
{
struct data_area_list *ba;
dm_list_iterate_items(ba, &info->bas) {
if (!fun(&ba->disk_locn, baton))
return_0;
}
return 1;
}
/*
* The lifetime of the label returned is tied to the lifetime of the
* lvmcache_info which is the same as lvmcache itself.
*/
struct label *lvmcache_get_label(struct lvmcache_info *info) {
return info->label;
}
void lvmcache_make_valid(struct lvmcache_info *info) {
info->status &= ~CACHE_INVALID;
}
uint64_t lvmcache_device_size(struct lvmcache_info *info) {
return info->device_size;
}
void lvmcache_set_device_size(struct lvmcache_info *info, uint64_t size) {
info->device_size = size;
}
struct device *lvmcache_device(struct lvmcache_info *info) {
return info->dev;
}
int lvmcache_is_orphan(struct lvmcache_info *info) {
if (!info->vginfo)
return 1; /* FIXME? */
return is_orphan_vg(info->vginfo->vgname);
}
int lvmcache_vgid_is_cached(const char *vgid) {
struct lvmcache_vginfo *vginfo;
if (lvmetad_active())
return 1;
vginfo = lvmcache_vginfo_from_vgid(vgid);
if (!vginfo || !vginfo->vgname)
return 0;
if (is_orphan_vg(vginfo->vgname))
return 0;
return 1;
}
/*
* Return true iff it is impossible to find out from this info alone whether the
* PV in question is or is not an orphan.
*/
int lvmcache_uncertain_ownership(struct lvmcache_info *info) {
return mdas_empty_or_ignored(&info->mdas);
}
uint64_t lvmcache_smallest_mda_size(struct lvmcache_info *info)
{
if (!info)
return UINT64_C(0);
return find_min_mda_size(&info->mdas);
}
const struct format_type *lvmcache_fmt(struct lvmcache_info *info) {
return info->fmt;
}
int lvmcache_lookup_mda(struct lvmcache_vgsummary *vgsummary)
{
struct lvmcache_vginfo *vginfo;
if (!vgsummary->mda_size)
return 0;
/* FIXME Index the checksums */
dm_list_iterate_items(vginfo, &_vginfos) {
if (vgsummary->mda_checksum == vginfo->mda_checksum &&
vgsummary->mda_size == vginfo->mda_size &&
!is_orphan_vg(vginfo->vgname)) {
vgsummary->vgname = vginfo->vgname;
vgsummary->creation_host = vginfo->creation_host;
vgsummary->vgstatus = vginfo->status;
/* vginfo->vgid has 1 extra byte then vgsummary->vgid */
memcpy(&vgsummary->vgid, vginfo->vgid, sizeof(vgsummary->vgid));
return 1;
}
}
return 0;
}
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