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d3e282c9d8
lvm2/lib/metadata/metadata.c
Dave Wysochanski 4631e58782 Rename get_vgs() to get_vgnames() and clarify related error messages. 
get_vgs() really returns a list of vgnames.  In the future we will use
get_vgs() to return a list of vg structures, similar to get_pvs().
2009-02-03 16:19:25 +00:00

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/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lib.h"
#include "device.h"
#include "metadata.h"
#include "toolcontext.h"
#include "lvm-string.h"
#include "lvm-file.h"
#include "lvmcache.h"
#include "memlock.h"
#include "str_list.h"
#include "pv_alloc.h"
#include "activate.h"
#include "display.h"
#include "locking.h"
#include "archiver.h"
#include "defaults.h"
#include <sys/param.h>
/*
* FIXME: Check for valid handle before dereferencing field or log error?
*/
#define pv_field(handle, field) \
(((const struct physical_volume *)(handle))->field)
static struct physical_volume *_pv_read(struct cmd_context *cmd,
const char *pv_name,
struct dm_list *mdas,
uint64_t *label_sector,
int warnings);
static struct physical_volume *_pv_create(const struct format_type *fmt,
struct device *dev,
struct id *id, uint64_t size,
uint64_t pe_start,
uint32_t existing_extent_count,
uint32_t existing_extent_size,
int pvmetadatacopies,
uint64_t pvmetadatasize, struct dm_list *mdas);
static int _pv_write(struct cmd_context *cmd __attribute((unused)),
struct physical_volume *pv,
struct dm_list *mdas, int64_t label_sector);
static struct physical_volume *_find_pv_by_name(struct cmd_context *cmd,
const char *pv_name);
static struct pv_list *_find_pv_in_vg(const struct volume_group *vg,
const char *pv_name);
static struct physical_volume *_find_pv_in_vg_by_uuid(const struct volume_group *vg,
const struct id *id);
unsigned long pe_align(struct physical_volume *pv)
{
if (pv->pe_align)
goto out;
pv->pe_align = MAX(65536UL, lvm_getpagesize()) >> SECTOR_SHIFT;
/*
* Align to chunk size of underlying md device if present
*/
if (!pv->dev)
goto out;
if (find_config_tree_bool(pv->fmt->cmd, "devices/md_chunk_alignment",
DEFAULT_MD_CHUNK_ALIGNMENT))
pv->pe_align = MAX(pv->pe_align,
dev_md_chunk_size(pv->fmt->cmd->sysfs_dir,
pv->dev));
log_very_verbose("%s: Setting PE alignment to %lu sectors.",
dev_name(pv->dev), pv->pe_align);
out:
return pv->pe_align;
}
/**
* add_pv_to_vg - Add a physical volume to a volume group
* @vg - volume group to add to
* @pv_name - name of the pv (to be removed)
* @pv - physical volume to add to volume group
*
* Returns:
* 0 - failure
* 1 - success
* FIXME: remove pv_name - obtain safely from pv
*/
int add_pv_to_vg(struct volume_group *vg, const char *pv_name,
struct physical_volume *pv)
{
struct pv_list *pvl;
struct format_instance *fid = vg->fid;
struct dm_pool *mem = fid->fmt->cmd->mem;
log_verbose("Adding physical volume '%s' to volume group '%s'",
pv_name, vg->name);
if (!(pvl = dm_pool_zalloc(mem, sizeof(*pvl)))) {
log_error("pv_list allocation for '%s' failed", pv_name);
return 0;
}
if (!is_orphan_vg(pv->vg_name)) {
log_error("Physical volume '%s' is already in volume group "
"'%s'", pv_name, pv->vg_name);
return 0;
}
if (pv->fmt != fid->fmt) {
log_error("Physical volume %s is of different format type (%s)",
pv_name, pv->fmt->name);
return 0;
}
/* Ensure PV doesn't depend on another PV already in the VG */
if (pv_uses_vg(pv, vg)) {
log_error("Physical volume %s might be constructed from same "
"volume group %s", pv_name, vg->name);
return 0;
}
if (!(pv->vg_name = dm_pool_strdup(mem, vg->name))) {
log_error("vg->name allocation failed for '%s'", pv_name);
return 0;
}
memcpy(&pv->vgid, &vg->id, sizeof(vg->id));
/* Units of 512-byte sectors */
pv->pe_size = vg->extent_size;
/* FIXME Do proper rounding-up alignment? */
/* Reserved space for label; this holds 0 for PVs created by LVM1 */
if (pv->pe_start < pe_align(pv))
pv->pe_start = pe_align(pv);
/*
* pe_count must always be calculated by pv_setup
*/
pv->pe_alloc_count = 0;
if (!fid->fmt->ops->pv_setup(fid->fmt, UINT64_C(0), 0,
vg->extent_size, 0, UINT64_C(0),
&fid->metadata_areas, pv, vg)) {
log_error("Format-specific setup of physical volume '%s' "
"failed.", pv_name);
return 0;
}
if (_find_pv_in_vg(vg, pv_name)) {
log_error("Physical volume '%s' listed more than once.",
pv_name);
return 0;
}
if (vg->pv_count && (vg->pv_count == vg->max_pv)) {
log_error("No space for '%s' - volume group '%s' "
"holds max %d physical volume(s).", pv_name,
vg->name, vg->max_pv);
return 0;
}
if (!alloc_pv_segment_whole_pv(mem, pv))
return_0;
pvl->pv = pv;
dm_list_add(&vg->pvs, &pvl->list);
if ((uint64_t) vg->extent_count + pv->pe_count > UINT32_MAX) {
log_error("Unable to add %s to %s: new extent count (%"
PRIu64 ") exceeds limit (%" PRIu32 ").",
pv_name, vg->name,
(uint64_t) vg->extent_count + pv->pe_count,
UINT32_MAX);
return 0;
}
vg->pv_count++;
vg->extent_count += pv->pe_count;
vg->free_count += pv->pe_count;
return 1;
}
static int _copy_pv(struct physical_volume *pv_to,
struct physical_volume *pv_from)
{
memcpy(pv_to, pv_from, sizeof(*pv_to));
if (!str_list_dup(pv_to->fmt->cmd->mem, &pv_to->tags, &pv_from->tags)) {
log_error("PV tags duplication failed");
return 0;
}
if (!peg_dup(pv_to->fmt->cmd->mem, &pv_to->segments,
&pv_from->segments))
return_0;
return 1;
}
int get_pv_from_vg_by_id(const struct format_type *fmt, const char *vg_name,
const char *vgid, const char *pvid,
struct physical_volume *pv)
{
struct volume_group *vg;
struct pv_list *pvl;
int consistent = 0;
if (!(vg = vg_read_internal(fmt->cmd, vg_name, vgid, &consistent))) {
log_error("get_pv_from_vg_by_id: vg_read_internal failed to read VG %s",
vg_name);
return 0;
}
if (!consistent)
log_warn("WARNING: Volume group %s is not consistent",
vg_name);
dm_list_iterate_items(pvl, &vg->pvs) {
if (id_equal(&pvl->pv->id, (const struct id *) pvid)) {
if (!_copy_pv(pv, pvl->pv))
return_0;
return 1;
}
}
return 0;
}
static int validate_new_vg_name(struct cmd_context *cmd, const char *vg_name)
{
char vg_path[PATH_MAX];
if (!validate_name(vg_name))
return_0;
snprintf(vg_path, PATH_MAX, "%s%s", cmd->dev_dir, vg_name);
if (path_exists(vg_path)) {
log_error("%s: already exists in filesystem", vg_path);
return 0;
}
return 1;
}
int validate_vg_rename_params(struct cmd_context *cmd,
const char *vg_name_old,
const char *vg_name_new)
{
unsigned length;
char *dev_dir;
dev_dir = cmd->dev_dir;
length = strlen(dev_dir);
/* Check sanity of new name */
if (strlen(vg_name_new) > NAME_LEN - length - 2) {
log_error("New volume group path exceeds maximum length "
"of %d!", NAME_LEN - length - 2);
return 0;
}
if (!validate_new_vg_name(cmd, vg_name_new)) {
log_error("New volume group name \"%s\" is invalid",
vg_name_new);
return 0;
}
if (!strcmp(vg_name_old, vg_name_new)) {
log_error("Old and new volume group names must differ");
return 0;
}
return 1;
}
int vg_rename(struct cmd_context *cmd, struct volume_group *vg,
const char *new_name)
{
struct dm_pool *mem = cmd->mem;
struct pv_list *pvl;
if (!(vg->name = dm_pool_strdup(mem, new_name))) {
log_error("vg->name allocation failed for '%s'", new_name);
return 0;
}
dm_list_iterate_items(pvl, &vg->pvs) {
if (!(pvl->pv->vg_name = dm_pool_strdup(mem, new_name))) {
log_error("pv->vg_name allocation failed for '%s'",
pv_dev_name(pvl->pv));
return 0;
}
}
return 1;
}
static int remove_lvs_in_vg(struct cmd_context *cmd,
struct volume_group *vg,
force_t force)
{
struct dm_list *lst;
struct lv_list *lvl;
while ((lst = dm_list_first(&vg->lvs))) {
lvl = dm_list_item(lst, struct lv_list);
if (!lv_remove_with_dependencies(cmd, lvl->lv, force))
return 0;
}
return 1;
}
/* FIXME: remove redundant vg_name */
int vg_remove_single(struct cmd_context *cmd, const char *vg_name,
struct volume_group *vg, int consistent,
force_t force __attribute((unused)))
{
struct physical_volume *pv;
struct pv_list *pvl;
unsigned lv_count;
int ret = 1;
if (!vg || !consistent || vg_missing_pv_count(vg)) {
log_error("Volume group \"%s\" not found, is inconsistent "
"or has PVs missing.", vg_name);
log_error("Consider vgreduce --removemissing if metadata "
"is inconsistent.");
return 0;
}
if (!vg_check_status(vg, EXPORTED_VG))
return 0;
lv_count = displayable_lvs_in_vg(vg);
if (lv_count) {
if ((force == PROMPT) &&
(yes_no_prompt("Do you really want to remove volume "
"group \"%s\" containing %u "
"logical volumes? [y/n]: ",
vg_name, lv_count) == 'n')) {
log_print("Volume group \"%s\" not removed", vg_name);
return 0;
}
if (!remove_lvs_in_vg(cmd, vg, force))
return 0;
}
lv_count = displayable_lvs_in_vg(vg);
if (lv_count) {
log_error("Volume group \"%s\" still contains %u "
"logical volume(s)", vg_name, lv_count);
return 0;
}
if (!archive(vg))
return 0;
if (!vg_remove(vg)) {
log_error("vg_remove %s failed", vg_name);
return 0;
}
/* init physical volumes */
dm_list_iterate_items(pvl, &vg->pvs) {
pv = pvl->pv;
log_verbose("Removing physical volume \"%s\" from "
"volume group \"%s\"", pv_dev_name(pv), vg_name);
pv->vg_name = vg->fid->fmt->orphan_vg_name;
pv->status = ALLOCATABLE_PV;
if (!dev_get_size(pv_dev(pv), &pv->size)) {
log_error("%s: Couldn't get size.", pv_dev_name(pv));
ret = 0;
continue;
}
/* FIXME Write to same sector label was read from */
if (!pv_write(cmd, pv, NULL, INT64_C(-1))) {
log_error("Failed to remove physical volume \"%s\""
" from volume group \"%s\"",
pv_dev_name(pv), vg_name);
ret = 0;
}
}
backup_remove(cmd, vg_name);
if (ret)
log_print("Volume group \"%s\" successfully removed", vg_name);
else
log_error("Volume group \"%s\" not properly removed", vg_name);
return ret;
}
int vg_extend(struct volume_group *vg, int pv_count, char **pv_names)
{
int i;
struct physical_volume *pv;
/* attach each pv */
for (i = 0; i < pv_count; i++) {
if (!(pv = pv_by_path(vg->fid->fmt->cmd, pv_names[i]))) {
log_error("%s not identified as an existing "
"physical volume", pv_names[i]);
goto bad;
}
if (!add_pv_to_vg(vg, pv_names[i], pv))
goto bad;
}
/* FIXME Decide whether to initialise and add new mdahs to format instance */
return 1;
bad:
log_error("Unable to add physical volume '%s' to "
"volume group '%s'.", pv_names[i], vg->name);
return 0;
}
const char *strip_dir(const char *vg_name, const char *dev_dir)
{
size_t len = strlen(dev_dir);
if (!strncmp(vg_name, dev_dir, len))
vg_name += len;
return vg_name;
}
/*
* Validate parameters to vg_create() before calling.
* FIXME: Move inside vg_create library function.
* FIXME: Change vgcreate_params struct to individual gets/sets
*/
int validate_vg_create_params(struct cmd_context *cmd,
struct vgcreate_params *vp)
{
if (!validate_new_vg_name(cmd, vp->vg_name)) {
log_error("New volume group name \"%s\" is invalid",
vp->vg_name);
return 1;
}
if (vp->alloc == ALLOC_INHERIT) {
log_error("Volume Group allocation policy cannot inherit "
"from anything");
return 1;
}
if (!vp->extent_size) {
log_error("Physical extent size may not be zero");
return 1;
}
if (!(cmd->fmt->features & FMT_UNLIMITED_VOLS)) {
if (!vp->max_lv)
vp->max_lv = 255;
if (!vp->max_pv)
vp->max_pv = 255;
if (vp->max_lv > 255 || vp->max_pv > 255) {
log_error("Number of volumes may not exceed 255");
return 1;
}
}
return 0;
}
struct volume_group *vg_create(struct cmd_context *cmd, const char *vg_name,
uint32_t extent_size, uint32_t max_pv,
uint32_t max_lv, alloc_policy_t alloc,
int pv_count, char **pv_names)
{
struct volume_group *vg;
struct dm_pool *mem = cmd->mem;
int consistent = 0;
if (!(vg = dm_pool_zalloc(mem, sizeof(*vg))))
return_NULL;
/* is this vg name already in use ? */
if (vg_read_internal(cmd, vg_name, NULL, &consistent)) {
log_err("A volume group called '%s' already exists.", vg_name);
goto bad;
}
if (!id_create(&vg->id)) {
log_err("Couldn't create uuid for volume group '%s'.", vg_name);
goto bad;
}
/* Strip dev_dir if present */
vg_name = strip_dir(vg_name, cmd->dev_dir);
vg->cmd = cmd;
if (!(vg->name = dm_pool_strdup(mem, vg_name)))
goto_bad;
vg->seqno = 0;
vg->status = (RESIZEABLE_VG | LVM_READ | LVM_WRITE);
if (!(vg->system_id = dm_pool_alloc(mem, NAME_LEN)))
goto_bad;
*vg->system_id = '\0';
vg->extent_size = extent_size;
vg->extent_count = 0;
vg->free_count = 0;
vg->max_lv = max_lv;
vg->max_pv = max_pv;
vg->alloc = alloc;
vg->pv_count = 0;
dm_list_init(&vg->pvs);
vg->lv_count = 0;
dm_list_init(&vg->lvs);
vg->snapshot_count = 0;
dm_list_init(&vg->tags);
if (!(vg->fid = cmd->fmt->ops->create_instance(cmd->fmt, vg_name,
NULL, NULL))) {
log_error("Failed to create format instance");
goto bad;
}
if (vg->fid->fmt->ops->vg_setup &&
!vg->fid->fmt->ops->vg_setup(vg->fid, vg)) {
log_error("Format specific setup of volume group '%s' failed.",
vg_name);
goto bad;
}
/* attach the pv's */
if (!vg_extend(vg, pv_count, pv_names))
goto_bad;
return vg;
bad:
dm_pool_free(mem, vg);
return NULL;
}
static int _recalc_extents(uint32_t *extents, const char *desc1,
const char *desc2, uint32_t old_size,
uint32_t new_size)
{
uint64_t size = (uint64_t) old_size * (*extents);
if (size % new_size) {
log_error("New size %" PRIu64 " for %s%s not an exact number "
"of new extents.", size, desc1, desc2);
return 0;
}
size /= new_size;
if (size > UINT32_MAX) {
log_error("New extent count %" PRIu64 " for %s%s exceeds "
"32 bits.", size, desc1, desc2);
return 0;
}
*extents = (uint32_t) size;
return 1;
}
int vg_change_pesize(struct cmd_context *cmd __attribute((unused)),
struct volume_group *vg, uint32_t new_size)
{
uint32_t old_size = vg->extent_size;
struct pv_list *pvl;
struct lv_list *lvl;
struct physical_volume *pv;
struct logical_volume *lv;
struct lv_segment *seg;
struct pv_segment *pvseg;
uint32_t s;
vg->extent_size = new_size;
if (vg->fid->fmt->ops->vg_setup &&
!vg->fid->fmt->ops->vg_setup(vg->fid, vg))
return_0;
if (!_recalc_extents(&vg->extent_count, vg->name, "", old_size,
new_size))
return_0;
if (!_recalc_extents(&vg->free_count, vg->name, " free space",
old_size, new_size))
return_0;
/* foreach PV */
dm_list_iterate_items(pvl, &vg->pvs) {
pv = pvl->pv;
pv->pe_size = new_size;
if (!_recalc_extents(&pv->pe_count, pv_dev_name(pv), "",
old_size, new_size))
return_0;
if (!_recalc_extents(&pv->pe_alloc_count, pv_dev_name(pv),
" allocated space", old_size, new_size))
return_0;
/* foreach free PV Segment */
dm_list_iterate_items(pvseg, &pv->segments) {
if (pvseg_is_allocated(pvseg))
continue;
if (!_recalc_extents(&pvseg->pe, pv_dev_name(pv),
" PV segment start", old_size,
new_size))
return_0;
if (!_recalc_extents(&pvseg->len, pv_dev_name(pv),
" PV segment length", old_size,
new_size))
return_0;
}
}
/* foreach LV */
dm_list_iterate_items(lvl, &vg->lvs) {
lv = lvl->lv;
if (!_recalc_extents(&lv->le_count, lv->name, "", old_size,
new_size))
return_0;
dm_list_iterate_items(seg, &lv->segments) {
if (!_recalc_extents(&seg->le, lv->name,
" segment start", old_size,
new_size))
return_0;
if (!_recalc_extents(&seg->len, lv->name,
" segment length", old_size,
new_size))
return_0;
if (!_recalc_extents(&seg->area_len, lv->name,
" area length", old_size,
new_size))
return_0;
if (!_recalc_extents(&seg->extents_copied, lv->name,
" extents moved", old_size,
new_size))
return_0;
/* foreach area */
for (s = 0; s < seg->area_count; s++) {
switch (seg_type(seg, s)) {
case AREA_PV:
if (!_recalc_extents
(&seg_pe(seg, s),
lv->name,
" pvseg start", old_size,
new_size))
return_0;
if (!_recalc_extents
(&seg_pvseg(seg, s)->len,
lv->name,
" pvseg length", old_size,
new_size))
return_0;
break;
case AREA_LV:
if (!_recalc_extents
(&seg_le(seg, s), lv->name,
" area start", old_size,
new_size))
return_0;
break;
case AREA_UNASSIGNED:
log_error("Unassigned area %u found in "
"segment", s);
return 0;
}
}
}
}
return 1;
}
/*
* Separate metadata areas after splitting a VG.
* Also accepts orphan VG as destination (for vgreduce).
*/
int vg_split_mdas(struct cmd_context *cmd __attribute((unused)),
struct volume_group *vg_from, struct volume_group *vg_to)
{
struct metadata_area *mda, *mda2;
struct dm_list *mdas_from, *mdas_to;
int common_mda = 0;
mdas_from = &vg_from->fid->metadata_areas;
mdas_to = &vg_to->fid->metadata_areas;
dm_list_iterate_items_safe(mda, mda2, mdas_from) {
if (!mda->ops->mda_in_vg) {
common_mda = 1;
continue;
}
if (!mda->ops->mda_in_vg(vg_from->fid, vg_from, mda)) {
if (is_orphan_vg(vg_to->name))
dm_list_del(&mda->list);
else
dm_list_move(mdas_to, &mda->list);
}
}
if (dm_list_empty(mdas_from) ||
(!is_orphan_vg(vg_to->name) && dm_list_empty(mdas_to)))
return common_mda;
return 1;
}
/**
* pv_create - initialize a physical volume for use with a volume group
* @fmt: format type
* @dev: PV device to initialize
* @id: PV UUID to use for initialization
* @size: size of the PV in sectors
* @pe_start: physical extent start
* @existing_extent_count
* @existing_extent_size
* @pvmetadatacopies
* @pvmetadatasize
* @mdas
*
* Returns:
* PV handle - physical volume initialized successfully
* NULL - invalid parameter or problem initializing the physical volume
*
* Note:
* FIXME - liblvm todo - tidy up arguments for external use (fmt, mdas, etc)
*/
pv_t *pv_create(const struct cmd_context *cmd,
struct device *dev,
struct id *id, uint64_t size,
uint64_t pe_start,
uint32_t existing_extent_count,
uint32_t existing_extent_size,
int pvmetadatacopies,
uint64_t pvmetadatasize, struct dm_list *mdas)
{
return _pv_create(cmd->fmt, dev, id, size, pe_start,
existing_extent_count,
existing_extent_size,
pvmetadatacopies,
pvmetadatasize, mdas);
}
static void _free_pv(struct dm_pool *mem, struct physical_volume *pv)
{
dm_pool_free(mem, pv);
}
static struct physical_volume *_alloc_pv(struct dm_pool *mem, struct device *dev)
{
struct physical_volume *pv = dm_pool_zalloc(mem, sizeof(*pv));
if (!pv)
return_NULL;
if (!(pv->vg_name = dm_pool_zalloc(mem, NAME_LEN))) {
dm_pool_free(mem, pv);
return NULL;
}
pv->pe_size = 0;
pv->pe_start = 0;
pv->pe_count = 0;
pv->pe_alloc_count = 0;
pv->pe_align = 0;
pv->fmt = NULL;
pv->dev = dev;
pv->status = ALLOCATABLE_PV;
dm_list_init(&pv->tags);
dm_list_init(&pv->segments);
return pv;
}
/* Sizes in sectors */
static struct physical_volume *_pv_create(const struct format_type *fmt,
struct device *dev,
struct id *id, uint64_t size,
uint64_t pe_start,
uint32_t existing_extent_count,
uint32_t existing_extent_size,
int pvmetadatacopies,
uint64_t pvmetadatasize, struct dm_list *mdas)
{
struct dm_pool *mem = fmt->cmd->mem;
struct physical_volume *pv = _alloc_pv(mem, dev);
if (!pv)
return NULL;
if (id)
memcpy(&pv->id, id, sizeof(*id));
else if (!id_create(&pv->id)) {
log_error("Failed to create random uuid for %s.",
dev_name(dev));
goto bad;
}
if (!dev_get_size(pv->dev, &pv->size)) {
log_error("%s: Couldn't get size.", pv_dev_name(pv));
goto bad;
}
if (size) {
if (size > pv->size)
log_warn("WARNING: %s: Overriding real size. "
"You could lose data.", pv_dev_name(pv));
log_verbose("%s: Pretending size is %" PRIu64 " sectors.",
pv_dev_name(pv), size);
pv->size = size;
}
if (pv->size < PV_MIN_SIZE) {
log_error("%s: Size must exceed minimum of %ld sectors.",
pv_dev_name(pv), PV_MIN_SIZE);
goto bad;
}
pv->fmt = fmt;
pv->vg_name = fmt->orphan_vg_name;
if (!fmt->ops->pv_setup(fmt, pe_start, existing_extent_count,
existing_extent_size,
pvmetadatacopies, pvmetadatasize, mdas,
pv, NULL)) {
log_error("%s: Format-specific setup of physical volume "
"failed.", pv_dev_name(pv));
goto bad;
}
return pv;
bad:
_free_pv(mem, pv);
return NULL;
}
/* FIXME: liblvm todo - make into function that returns handle */
struct pv_list *find_pv_in_vg(const struct volume_group *vg,
const char *pv_name)
{
return _find_pv_in_vg(vg, pv_name);
}
static struct pv_list *_find_pv_in_vg(const struct volume_group *vg,
const char *pv_name)
{
struct pv_list *pvl;
dm_list_iterate_items(pvl, &vg->pvs)
if (pvl->pv->dev == dev_cache_get(pv_name, vg->cmd->filter))
return pvl;
return NULL;
}
struct pv_list *find_pv_in_pv_list(const struct dm_list *pl,
const struct physical_volume *pv)
{
struct pv_list *pvl;
dm_list_iterate_items(pvl, pl)
if (pvl->pv == pv)
return pvl;
return NULL;
}
int pv_is_in_vg(struct volume_group *vg, struct physical_volume *pv)
{
struct pv_list *pvl;
dm_list_iterate_items(pvl, &vg->pvs)
if (pv == pvl->pv)
return 1;
return 0;
}
/**
* find_pv_in_vg_by_uuid - Find PV in VG by PV UUID
* @vg: volume group to search
* @id: UUID of the PV to match
*
* Returns:
* PV handle - if UUID of PV found in VG
* NULL - invalid parameter or UUID of PV not found in VG
*
* Note
* FIXME - liblvm todo - make into function that takes VG handle
*/
pv_t *find_pv_in_vg_by_uuid(const struct volume_group *vg,
const struct id *id)
{
return _find_pv_in_vg_by_uuid(vg, id);
}
static struct physical_volume *_find_pv_in_vg_by_uuid(const struct volume_group *vg,
const struct id *id)
{
struct pv_list *pvl;
dm_list_iterate_items(pvl, &vg->pvs)
if (id_equal(&pvl->pv->id, id))
return pvl->pv;
return NULL;
}
struct lv_list *find_lv_in_vg(const struct volume_group *vg,
const char *lv_name)
{
struct lv_list *lvl;
const char *ptr;
/* Use last component */
if ((ptr = strrchr(lv_name, '/')))
ptr++;
else
ptr = lv_name;
dm_list_iterate_items(lvl, &vg->lvs)
if (!strcmp(lvl->lv->name, ptr))
return lvl;
return NULL;
}
struct lv_list *find_lv_in_lv_list(const struct dm_list *ll,
const struct logical_volume *lv)
{
struct lv_list *lvl;
dm_list_iterate_items(lvl, ll)
if (lvl->lv == lv)
return lvl;
return NULL;
}
struct lv_list *find_lv_in_vg_by_lvid(struct volume_group *vg,
const union lvid *lvid)
{
struct lv_list *lvl;
dm_list_iterate_items(lvl, &vg->lvs)
if (!strncmp(lvl->lv->lvid.s, lvid->s, sizeof(*lvid)))
return lvl;
return NULL;
}
struct logical_volume *find_lv(const struct volume_group *vg,
const char *lv_name)
{
struct lv_list *lvl = find_lv_in_vg(vg, lv_name);
return lvl ? lvl->lv : NULL;
}
struct physical_volume *find_pv(struct volume_group *vg, struct device *dev)
{
struct pv_list *pvl;
dm_list_iterate_items(pvl, &vg->pvs)
if (dev == pvl->pv->dev)
return pvl->pv;
return NULL;
}
/* FIXME: liblvm todo - make into function that returns handle */
struct physical_volume *find_pv_by_name(struct cmd_context *cmd,
const char *pv_name)
{
return _find_pv_by_name(cmd, pv_name);
}
static struct physical_volume *_find_pv_by_name(struct cmd_context *cmd,
const char *pv_name)
{
struct physical_volume *pv;
if (!(pv = _pv_read(cmd, pv_name, NULL, NULL, 1))) {
log_error("Physical volume %s not found", pv_name);
return NULL;
}
if (is_orphan_vg(pv->vg_name)) {
/* If a PV has no MDAs - need to search all VGs for it */
if (!scan_vgs_for_pvs(cmd))
return_NULL;
if (!(pv = _pv_read(cmd, pv_name, NULL, NULL, 1))) {
log_error("Physical volume %s not found", pv_name);
return NULL;
}
}
if (is_orphan_vg(pv->vg_name)) {
log_error("Physical volume %s not in a volume group", pv_name);
return NULL;
}
return pv;
}
/* Find segment at a given logical extent in an LV */
struct lv_segment *find_seg_by_le(const struct logical_volume *lv, uint32_t le)
{
struct lv_segment *seg;
dm_list_iterate_items(seg, &lv->segments)
if (le >= seg->le && le < seg->le + seg->len)
return seg;
return NULL;
}
struct lv_segment *first_seg(const struct logical_volume *lv)
{
struct lv_segment *seg = NULL;
dm_list_iterate_items(seg, &lv->segments)
break;
return seg;
}
/* Find segment at a given physical extent in a PV */
struct pv_segment *find_peg_by_pe(const struct physical_volume *pv, uint32_t pe)
{
struct pv_segment *peg;
dm_list_iterate_items(peg, &pv->segments)
if (pe >= peg->pe && pe < peg->pe + peg->len)
return peg;
return NULL;
}
int vg_remove(struct volume_group *vg)
{
struct metadata_area *mda;
/* FIXME Improve recovery situation? */
/* Remove each copy of the metadata */
dm_list_iterate_items(mda, &vg->fid->metadata_areas) {
if (mda->ops->vg_remove &&
!mda->ops->vg_remove(vg->fid, vg, mda))
return_0;
}
return 1;
}
unsigned displayable_lvs_in_vg(const struct volume_group *vg)
{
struct lv_list *lvl;
unsigned lv_count = 0;
dm_list_iterate_items(lvl, &vg->lvs)
if (lv_is_displayable(lvl->lv))
lv_count++;
return lv_count;
}
/*
* Determine whether two vgs are compatible for merging.
*/
int vgs_are_compatible(struct cmd_context *cmd __attribute((unused)),
struct volume_group *vg_from,
struct volume_group *vg_to)
{
struct lv_list *lvl1, *lvl2;
struct pv_list *pvl;
char *name1, *name2;
if (lvs_in_vg_activated(vg_from)) {
log_error("Logical volumes in \"%s\" must be inactive",
vg_from->name);
return 0;
}
/* Check compatibility */
if (vg_to->extent_size != vg_from->extent_size) {
log_error("Extent sizes differ: %d (%s) and %d (%s)",
vg_to->extent_size, vg_to->name,
vg_from->extent_size, vg_from->name);
return 0;
}
if (vg_to->max_pv &&
(vg_to->max_pv < vg_to->pv_count + vg_from->pv_count)) {
log_error("Maximum number of physical volumes (%d) exceeded "
" for \"%s\" and \"%s\"", vg_to->max_pv, vg_to->name,
vg_from->name);
return 0;
}
if (vg_to->max_lv &&
(vg_to->max_lv < vg_to->lv_count + vg_from->lv_count)) {
log_error("Maximum number of logical volumes (%d) exceeded "
" for \"%s\" and \"%s\"", vg_to->max_lv, vg_to->name,
vg_from->name);
return 0;
}
/* Metadata types must be the same */
if (vg_to->fid->fmt != vg_from->fid->fmt) {
log_error("Metadata types differ for \"%s\" and \"%s\"",
vg_to->name, vg_from->name);
return 0;
}
/* Clustering attribute must be the same */
if (vg_is_clustered(vg_to) != vg_is_clustered(vg_from)) {
log_error("Clustered attribute differs for \"%s\" and \"%s\"",
vg_to->name, vg_from->name);
return 0;
}
/* Check no conflicts with LV names */
dm_list_iterate_items(lvl1, &vg_to->lvs) {
name1 = lvl1->lv->name;
dm_list_iterate_items(lvl2, &vg_from->lvs) {
name2 = lvl2->lv->name;
if (!strcmp(name1, name2)) {
log_error("Duplicate logical volume "
"name \"%s\" "
"in \"%s\" and \"%s\"",
name1, vg_to->name, vg_from->name);
return 0;
}
}
}
/* Check no PVs are constructed from either VG */
dm_list_iterate_items(pvl, &vg_to->pvs) {
if (pv_uses_vg(pvl->pv, vg_from)) {
log_error("Physical volume %s might be constructed "
"from same volume group %s.",
pv_dev_name(pvl->pv), vg_from->name);
return 0;
}
}
dm_list_iterate_items(pvl, &vg_from->pvs) {
if (pv_uses_vg(pvl->pv, vg_to)) {
log_error("Physical volume %s might be constructed "
"from same volume group %s.",
pv_dev_name(pvl->pv), vg_to->name);
return 0;
}
}
return 1;
}
struct _lv_postorder_baton {
int (*fn)(struct logical_volume *lv, void *data);
void *data;
};
static int _lv_postorder_visit(struct logical_volume *,
int (*fn)(struct logical_volume *lv, void *data),
void *data);
static int _lv_postorder_level(struct logical_volume *lv, void *data)
{
struct _lv_postorder_baton *baton = data;
if (lv->status & POSTORDER_OPEN_FLAG)
return 1; // a data structure loop has closed...
lv->status |= POSTORDER_OPEN_FLAG;
int r =_lv_postorder_visit(lv, baton->fn, baton->data);
lv->status &= ~POSTORDER_OPEN_FLAG;
lv->status |= POSTORDER_FLAG;
return r;
};
static int _lv_each_dependency(struct logical_volume *lv,
int (*fn)(struct logical_volume *lv, void *data),
void *data)
{
int i, s;
struct lv_segment *lvseg;
struct logical_volume *deps[] = {
lv->snapshot ? lv->snapshot->origin : 0,
lv->snapshot ? lv->snapshot->cow : 0 };
for (i = 0; i < sizeof(deps) / sizeof(*deps); ++i) {
if (deps[i] && !fn(deps[i], data))
return_0;
}
dm_list_iterate_items(lvseg, &lv->segments) {
if (lvseg->log_lv && !fn(lvseg->log_lv, data))
return_0;
for (s = 0; s < lvseg->area_count; ++s) {
if (seg_type(lvseg, s) == AREA_LV && !fn(seg_lv(lvseg,s), data))
return_0;
}
}
return 1;
}
static int _lv_postorder_cleanup(struct logical_volume *lv, void *data)
{
if (!(lv->status & POSTORDER_FLAG))
return 1;
lv->status &= ~POSTORDER_FLAG;
if (!_lv_each_dependency(lv, _lv_postorder_cleanup, data))
return_0;
return 1;
}
static int _lv_postorder_visit(struct logical_volume *lv,
int (*fn)(struct logical_volume *lv, void *data),
void *data)
{
struct _lv_postorder_baton baton;
int r;
if (lv->status & POSTORDER_FLAG)
return 1;
baton.fn = fn;
baton.data = data;
r = _lv_each_dependency(lv, _lv_postorder_level, &baton);
if (r) {
r = fn(lv, data);
log_verbose("visited %s", lv->name);
}
return r;
}
/*
* This will walk the LV dependency graph in depth-first order and in the
* postorder, call a callback function "fn". The void *data is passed along all
* the calls. The callback may return zero to indicate an error and terminate
* the depth-first walk. The error is propagated to return value of
* _lv_postorder.
*/
static int _lv_postorder(struct logical_volume *lv,
int (*fn)(struct logical_volume *lv, void *data),
void *data)
{
int r;
r = _lv_postorder_visit(lv, fn, data);
_lv_postorder_cleanup(lv, 0);
return r;
}
struct _lv_mark_if_partial_baton {
int partial;
};
static int _lv_mark_if_partial_collect(struct logical_volume *lv, void *data)
{
struct _lv_mark_if_partial_baton *baton = data;
if (lv->status & PARTIAL_LV)
baton->partial = 1;
return 1;
}
static int _lv_mark_if_partial_single(struct logical_volume *lv, void *data)
{
int s;
struct _lv_mark_if_partial_baton baton;
struct lv_segment *lvseg;
dm_list_iterate_items(lvseg, &lv->segments) {
for (s = 0; s < lvseg->area_count; ++s) {
if (seg_type(lvseg, s) == AREA_PV) {
if (seg_pv(lvseg, s)->status & MISSING_PV)
lv->status |= PARTIAL_LV;
}
}
}
baton.partial = 0;
_lv_each_dependency(lv, _lv_mark_if_partial_collect, &baton);
if (baton.partial)
lv->status |= PARTIAL_LV;
return 1;
}
static int _lv_mark_if_partial(struct logical_volume *lv)
{
return _lv_postorder(lv, _lv_mark_if_partial_single, NULL);
}
/*
* Mark LVs with missing PVs using PARTIAL_LV status flag. The flag is
* propagated transitively, so LVs referencing other LVs are marked
* partial as well, if any of their referenced LVs are marked partial.
*/
static int _vg_mark_partial_lvs(struct volume_group *vg)
{
struct logical_volume *lv;
struct lv_list *lvl;
dm_list_iterate_items(lvl, &vg->lvs) {
lv = lvl->lv;
if (!_lv_mark_if_partial(lv))
return_0;
}
return 1;
}
int vg_validate(struct volume_group *vg)
{
struct pv_list *pvl, *pvl2;
struct lv_list *lvl, *lvl2;
char uuid[64] __attribute((aligned(8)));
int r = 1;
uint32_t lv_count;
/* FIXME Also check there's no data/metadata overlap */
dm_list_iterate_items(pvl, &vg->pvs) {
dm_list_iterate_items(pvl2, &vg->pvs) {
if (pvl == pvl2)
break;
if (id_equal(&pvl->pv->id,
&pvl2->pv->id)) {
if (!id_write_format(&pvl->pv->id, uuid,
sizeof(uuid)))
stack;
log_error("Internal error: Duplicate PV id "
"%s detected for %s in %s.",
uuid, pv_dev_name(pvl->pv),
vg->name);
r = 0;
}
}
if (strcmp(pvl->pv->vg_name, vg->name)) {
log_error("Internal error: VG name for PV %s is corrupted",
pv_dev_name(pvl->pv));
r = 0;
}
}
if (!check_pv_segments(vg)) {
log_error("Internal error: PV segments corrupted in %s.",
vg->name);
r = 0;
}
if ((lv_count = (uint32_t) dm_list_size(&vg->lvs)) !=
vg->lv_count + 2 * vg->snapshot_count) {
log_error("Internal error: #internal LVs (%u) != #LVs (%"
PRIu32 ") + 2 * #snapshots (%" PRIu32 ") in VG %s",
dm_list_size(&vg->lvs), vg->lv_count,
vg->snapshot_count, vg->name);
r = 0;
}
dm_list_iterate_items(lvl, &vg->lvs) {
dm_list_iterate_items(lvl2, &vg->lvs) {
if (lvl == lvl2)
break;
if (!strcmp(lvl->lv->name, lvl2->lv->name)) {
log_error("Internal error: Duplicate LV name "
"%s detected in %s.", lvl->lv->name,
vg->name);
r = 0;
}
if (id_equal(&lvl->lv->lvid.id[1],
&lvl2->lv->lvid.id[1])) {
if (!id_write_format(&lvl->lv->lvid.id[1], uuid,
sizeof(uuid)))
stack;
log_error("Internal error: Duplicate LV id "
"%s detected for %s and %s in %s.",
uuid, lvl->lv->name, lvl2->lv->name,
vg->name);
r = 0;
}
}
}
dm_list_iterate_items(lvl, &vg->lvs) {
if (!check_lv_segments(lvl->lv, 1)) {
log_error("Internal error: LV segments corrupted in %s.",
lvl->lv->name);
r = 0;
}
}
if (!(vg->fid->fmt->features & FMT_UNLIMITED_VOLS) &&
(!vg->max_lv || !vg->max_pv)) {
log_error("Internal error: Volume group %s has limited PV/LV count"
" but limit is not set.", vg->name);
r = 0;
}
return r;
}
/*
* After vg_write() returns success,
* caller MUST call either vg_commit() or vg_revert()
*/
int vg_write(struct volume_group *vg)
{
struct dm_list *mdah;
struct metadata_area *mda;
if (!vg_validate(vg))
return_0;
if (vg->status & PARTIAL_VG) {
log_error("Cannot update partial volume group %s.", vg->name);
return 0;
}
if (vg_missing_pv_count(vg) && !vg->cmd->handles_missing_pvs) {
log_error("Cannot update volume group %s while physical "
"volumes are missing.", vg->name);
return 0;
}
if (dm_list_empty(&vg->fid->metadata_areas)) {
log_error("Aborting vg_write: No metadata areas to write to!");
return 0;
}
if (!drop_cached_metadata(vg)) {
log_error("Unable to drop cached metadata for VG %s.", vg->name);
return 0;
}
vg->seqno++;
/* Write to each copy of the metadata area */
dm_list_iterate_items(mda, &vg->fid->metadata_areas) {
if (!mda->ops->vg_write) {
log_error("Format does not support writing volume"
"group metadata areas");
/* Revert */
dm_list_uniterate(mdah, &vg->fid->metadata_areas, &mda->list) {
mda = dm_list_item(mdah, struct metadata_area);
if (mda->ops->vg_revert &&
!mda->ops->vg_revert(vg->fid, vg, mda)) {
stack;
}
}
return 0;
}
if (!mda->ops->vg_write(vg->fid, vg, mda)) {
stack;
/* Revert */
dm_list_uniterate(mdah, &vg->fid->metadata_areas, &mda->list) {
mda = dm_list_item(mdah, struct metadata_area);
if (mda->ops->vg_revert &&
!mda->ops->vg_revert(vg->fid, vg, mda)) {
stack;
}
}
return 0;
}
}
/* Now pre-commit each copy of the new metadata */
dm_list_iterate_items(mda, &vg->fid->metadata_areas) {
if (mda->ops->vg_precommit &&
!mda->ops->vg_precommit(vg->fid, vg, mda)) {
stack;
/* Revert */
dm_list_iterate_items(mda, &vg->fid->metadata_areas) {
if (mda->ops->vg_revert &&
!mda->ops->vg_revert(vg->fid, vg, mda)) {
stack;
}
}
return 0;
}
}
return 1;
}
/* Commit pending changes */
int vg_commit(struct volume_group *vg)
{
struct metadata_area *mda;
int cache_updated = 0;
int failed = 0;
if (!vgname_is_locked(vg->name)) {
log_error("Internal error: Attempt to write new VG metadata "
"without locking %s", vg->name);
return cache_updated;
}
/* Commit to each copy of the metadata area */
dm_list_iterate_items(mda, &vg->fid->metadata_areas) {
failed = 0;
if (mda->ops->vg_commit &&
!mda->ops->vg_commit(vg->fid, vg, mda)) {
stack;
failed = 1;
}
/* Update cache first time we succeed */
if (!failed && !cache_updated) {
lvmcache_update_vg(vg, 0);
cache_updated = 1;
}
}
/* If update failed, remove any cached precommitted metadata. */
if (!cache_updated && !drop_cached_metadata(vg))
log_error("Attempt to drop cached metadata failed "
"after commit for VG %s.", vg->name);
/* If at least one mda commit succeeded, it was committed */
return cache_updated;
}
/* Don't commit any pending changes */
int vg_revert(struct volume_group *vg)
{
struct metadata_area *mda;
dm_list_iterate_items(mda, &vg->fid->metadata_areas) {
if (mda->ops->vg_revert &&
!mda->ops->vg_revert(vg->fid, vg, mda)) {
stack;
}
}
if (!drop_cached_metadata(vg))
log_error("Attempt to drop cached metadata failed "
"after reverted update for VG %s.", vg->name);
return 1;
}
/* Make orphan PVs look like a VG */
static struct volume_group *_vg_read_orphans(struct cmd_context *cmd,
const char *orphan_vgname)
{
struct lvmcache_vginfo *vginfo;
struct lvmcache_info *info;
struct pv_list *pvl;
struct volume_group *vg;
struct physical_volume *pv;
lvmcache_label_scan(cmd, 0);
if (!(vginfo = vginfo_from_vgname(orphan_vgname, NULL)))
return_NULL;
if (!(vg = dm_pool_zalloc(cmd->mem, sizeof(*vg)))) {
log_error("vg allocation failed");
return NULL;
}
dm_list_init(&vg->pvs);
dm_list_init(&vg->lvs);
dm_list_init(&vg->tags);
vg->cmd = cmd;
if (!(vg->name = dm_pool_strdup(cmd->mem, orphan_vgname))) {
log_error("vg name allocation failed");
return NULL;
}
/* create format instance with appropriate metadata area */
if (!(vg->fid = vginfo->fmt->ops->create_instance(vginfo->fmt,
orphan_vgname, NULL,
NULL))) {
log_error("Failed to create format instance");
dm_pool_free(cmd->mem, vg);
return NULL;
}
dm_list_iterate_items(info, &vginfo->infos) {
if (!(pv = _pv_read(cmd, dev_name(info->dev), NULL, NULL, 1))) {
continue;
}
if (!(pvl = dm_pool_zalloc(cmd->mem, sizeof(*pvl)))) {
log_error("pv_list allocation failed");
return NULL;
}
pvl->pv = pv;
dm_list_add(&vg->pvs, &pvl->list);
vg->pv_count++;
}
return vg;
}
static int _update_pv_list(struct dm_list *all_pvs, struct volume_group *vg)
{
struct pv_list *pvl, *pvl2;
dm_list_iterate_items(pvl, &vg->pvs) {
dm_list_iterate_items(pvl2, all_pvs) {
if (pvl->pv->dev == pvl2->pv->dev)
goto next_pv;
}
/* PV is not on list so add it. Note that we don't copy it. */
if (!(pvl2 = dm_pool_zalloc(vg->cmd->mem, sizeof(*pvl2)))) {
log_error("pv_list allocation for '%s' failed",
pv_dev_name(pvl->pv));
return 0;
}
pvl2->pv = pvl->pv;
dm_list_add(all_pvs, &pvl2->list);
next_pv:
;
}
return 1;
}
int vg_missing_pv_count(const vg_t *vg)
{
int ret = 0;
struct pv_list *pvl;
dm_list_iterate_items(pvl, &vg->pvs) {
if (pvl->pv->status & MISSING_PV)
++ ret;
}
return ret;
}
/* Caller sets consistent to 1 if it's safe for vg_read_internal to correct
* inconsistent metadata on disk (i.e. the VG write lock is held).
* This guarantees only consistent metadata is returned.
* If consistent is 0, caller must check whether consistent == 1 on return
* and take appropriate action if it isn't (e.g. abort; get write lock
* and call vg_read_internal again).
*
* If precommitted is set, use precommitted metadata if present.
*
* Either of vgname or vgid may be NULL.
*/
static struct volume_group *_vg_read(struct cmd_context *cmd,
const char *vgname,
const char *vgid,
int *consistent, unsigned precommitted)
{
struct format_instance *fid;
const struct format_type *fmt;
struct volume_group *vg, *correct_vg = NULL;
struct metadata_area *mda;
struct lvmcache_info *info;
int inconsistent = 0;
int inconsistent_vgid = 0;
int inconsistent_pvs = 0;
unsigned use_precommitted = precommitted;
struct dm_list *pvids;
struct pv_list *pvl, *pvl2;
struct dm_list all_pvs;
char uuid[64] __attribute((aligned(8)));
if (is_orphan_vg(vgname)) {
if (use_precommitted) {
log_error("Internal error: vg_read_internal requires vgname "
"with pre-commit.");
return NULL;
}
*consistent = 1;
return _vg_read_orphans(cmd, vgname);
}
if ((correct_vg = lvmcache_get_vg(vgid, precommitted))) {
if (vg_missing_pv_count(correct_vg)) {
log_verbose("There are %d physical volumes missing.",
vg_missing_pv_count(correct_vg));
_vg_mark_partial_lvs(correct_vg);
}
*consistent = 1;
return correct_vg;
}
/* Find the vgname in the cache */
/* If it's not there we must do full scan to be completely sure */
if (!(fmt = fmt_from_vgname(vgname, vgid))) {
lvmcache_label_scan(cmd, 0);
if (!(fmt = fmt_from_vgname(vgname, vgid))) {
if (memlock())
return_NULL;
lvmcache_label_scan(cmd, 2);
if (!(fmt = fmt_from_vgname(vgname, vgid)))
return_NULL;
}
}
/* Now determine the correct vgname if none was supplied */
if (!vgname && !(vgname = vgname_from_vgid(cmd->mem, vgid)))
return_NULL;
if (use_precommitted && !(fmt->features & FMT_PRECOMMIT))
use_precommitted = 0;
/* create format instance with appropriate metadata area */
if (!(fid = fmt->ops->create_instance(fmt, vgname, vgid, NULL))) {
log_error("Failed to create format instance");
return NULL;
}
/* Store pvids for later so we can check if any are missing */
if (!(pvids = lvmcache_get_pvids(cmd, vgname, vgid)))
return_NULL;
/* Ensure contents of all metadata areas match - else do recovery */
dm_list_iterate_items(mda, &fid->metadata_areas) {
if ((use_precommitted &&
!(vg = mda->ops->vg_read_precommit(fid, vgname, mda))) ||
(!use_precommitted &&
!(vg = mda->ops->vg_read(fid, vgname, mda)))) {
inconsistent = 1;
continue;
}
if (!correct_vg) {
correct_vg = vg;
continue;
}
/* FIXME Also ensure contents same - checksum compare? */
if (correct_vg->seqno != vg->seqno) {
inconsistent = 1;
if (vg->seqno > correct_vg->seqno)
correct_vg = vg;
}
}
/* Ensure every PV in the VG was in the cache */
if (correct_vg) {
/*
* If the VG has PVs without mdas, they may still be
* orphans in the cache: update the cache state here.
*/
if (!inconsistent &&
dm_list_size(&correct_vg->pvs) > dm_list_size(pvids)) {
dm_list_iterate_items(pvl, &correct_vg->pvs) {
if (!pvl->pv->dev) {
inconsistent_pvs = 1;
break;
}
if (str_list_match_item(pvids, pvl->pv->dev->pvid))
continue;
/*
* PV not marked as belonging to this VG in cache.
* Check it's an orphan without metadata area.
*/
if (!(info = info_from_pvid(pvl->pv->dev->pvid, 1)) ||
!info->vginfo || !is_orphan_vg(info->vginfo->vgname) ||
dm_list_size(&info->mdas)) {
inconsistent_pvs = 1;
break;
}
}
/* If the check passed, let's update VG and recalculate pvids */
if (!inconsistent_pvs) {
log_debug("Updating cache for PVs without mdas "
"in VG %s.", vgname);
lvmcache_update_vg(correct_vg, use_precommitted);
if (!(pvids = lvmcache_get_pvids(cmd, vgname, vgid)))
return_NULL;
}
}
if (dm_list_size(&correct_vg->pvs) != dm_list_size(pvids)
+ vg_missing_pv_count(correct_vg)) {
log_debug("Cached VG %s had incorrect PV list",
vgname);
if (memlock())
inconsistent = 1;
else
correct_vg = NULL;
} else dm_list_iterate_items(pvl, &correct_vg->pvs) {
if (pvl->pv->status & MISSING_PV)
continue;
if (!str_list_match_item(pvids, pvl->pv->dev->pvid)) {
log_debug("Cached VG %s had incorrect PV list",
vgname);
correct_vg = NULL;
break;
}
}
}
dm_list_init(&all_pvs);
/* Failed to find VG where we expected it - full scan and retry */
if (!correct_vg) {
inconsistent = 0;
if (memlock())
return_NULL;
lvmcache_label_scan(cmd, 2);
if (!(fmt = fmt_from_vgname(vgname, vgid)))
return_NULL;
if (precommitted && !(fmt->features & FMT_PRECOMMIT))
use_precommitted = 0;
/* create format instance with appropriate metadata area */
if (!(fid = fmt->ops->create_instance(fmt, vgname, vgid, NULL))) {
log_error("Failed to create format instance");
return NULL;
}
/* Ensure contents of all metadata areas match - else recover */
dm_list_iterate_items(mda, &fid->metadata_areas) {
if ((use_precommitted &&
!(vg = mda->ops->vg_read_precommit(fid, vgname,
mda))) ||
(!use_precommitted &&
!(vg = mda->ops->vg_read(fid, vgname, mda)))) {
inconsistent = 1;
continue;
}
if (!correct_vg) {
correct_vg = vg;
if (!_update_pv_list(&all_pvs, correct_vg))
return_NULL;
continue;
}
if (strncmp((char *)vg->id.uuid,
(char *)correct_vg->id.uuid, ID_LEN)) {
inconsistent = 1;
inconsistent_vgid = 1;
}
/* FIXME Also ensure contents same - checksums same? */
if (correct_vg->seqno != vg->seqno) {
inconsistent = 1;
if (!_update_pv_list(&all_pvs, vg))
return_NULL;
if (vg->seqno > correct_vg->seqno)
correct_vg = vg;
}
}
/* Give up looking */
if (!correct_vg)
return_NULL;
}
lvmcache_update_vg(correct_vg, use_precommitted);
if (inconsistent) {
/* FIXME Test should be if we're *using* precommitted metadata not if we were searching for it */
if (use_precommitted) {
log_error("Inconsistent pre-commit metadata copies "
"for volume group %s", vgname);
return NULL;
}
if (!*consistent)
return correct_vg;
/* Don't touch if vgids didn't match */
if (inconsistent_vgid) {
log_error("Inconsistent metadata UUIDs found for "
"volume group %s", vgname);
*consistent = 0;
return correct_vg;
}
log_warn("WARNING: Inconsistent metadata found for VG %s - updating "
"to use version %u", vgname, correct_vg->seqno);
if (!vg_write(correct_vg)) {
log_error("Automatic metadata correction failed");
return NULL;
}
if (!vg_commit(correct_vg)) {
log_error("Automatic metadata correction commit "
"failed");
return NULL;
}
dm_list_iterate_items(pvl, &all_pvs) {
dm_list_iterate_items(pvl2, &correct_vg->pvs) {
if (pvl->pv->dev == pvl2->pv->dev)
goto next_pv;
}
if (!id_write_format(&pvl->pv->id, uuid, sizeof(uuid)))
return_NULL;
log_error("Removing PV %s (%s) that no longer belongs to VG %s",
pv_dev_name(pvl->pv), uuid, correct_vg->name);
if (!pv_write_orphan(cmd, pvl->pv))
return_NULL;
next_pv:
;
}
}
if (vg_missing_pv_count(correct_vg)) {
log_verbose("There are %d physical volumes missing.",
vg_missing_pv_count(correct_vg));
_vg_mark_partial_lvs(correct_vg);
}
if ((correct_vg->status & PVMOVE) && !pvmove_mode()) {
log_error("WARNING: Interrupted pvmove detected in "
"volume group %s", correct_vg->name);
log_error("Please restore the metadata by running "
"vgcfgrestore.");
return NULL;
}
*consistent = 1;
return correct_vg;
}
struct volume_group *vg_read_internal(struct cmd_context *cmd, const char *vgname,
const char *vgid, int *consistent)
{
struct volume_group *vg;
struct lv_list *lvl;
if (!(vg = _vg_read(cmd, vgname, vgid, consistent, 0)))
return NULL;
if (!check_pv_segments(vg)) {
log_error("Internal error: PV segments corrupted in %s.",
vg->name);
return NULL;
}
dm_list_iterate_items(lvl, &vg->lvs) {
if (!check_lv_segments(lvl->lv, 1)) {
log_error("Internal error: LV segments corrupted in %s.",
lvl->lv->name);
return NULL;
}
}
return vg;
}
/* This is only called by lv_from_lvid, which is only called from
* activate.c so we know the appropriate VG lock is already held and
* the vg_read_internal is therefore safe.
*/
static struct volume_group *_vg_read_by_vgid(struct cmd_context *cmd,
const char *vgid,
unsigned precommitted)
{
const char *vgname;
struct dm_list *vgnames;
struct volume_group *vg;
struct lvmcache_vginfo *vginfo;
struct str_list *strl;
int consistent = 0;
/* Is corresponding vgname already cached? */
if ((vginfo = vginfo_from_vgid(vgid)) &&
vginfo->vgname && !is_orphan_vg(vginfo->vgname)) {
if ((vg = _vg_read(cmd, NULL, vgid,
&consistent, precommitted)) &&
!strncmp((char *)vg->id.uuid, vgid, ID_LEN)) {
if (!consistent) {
log_error("Volume group %s metadata is "
"inconsistent", vg->name);
}
return vg;
}
}
/* Mustn't scan if memory locked: ensure cache gets pre-populated! */
if (memlock())
return NULL;
/* FIXME Need a genuine read by ID here - don't vg_read_internal by name! */
/* FIXME Disabled vgrenames while active for now because we aren't
* allowed to do a full scan here any more. */
// The slow way - full scan required to cope with vgrename
if (!(vgnames = get_vgnames(cmd, 2))) {
log_error("vg_read_by_vgid: get_vgnames failed");
return NULL;
}
dm_list_iterate_items(strl, vgnames) {
vgname = strl->str;
if (!vgname || is_orphan_vg(vgname))
continue; // FIXME Unnecessary?
consistent = 0;
if ((vg = _vg_read(cmd, vgname, vgid, &consistent,
precommitted)) &&
!strncmp((char *)vg->id.uuid, vgid, ID_LEN)) {
if (!consistent) {
log_error("Volume group %s metadata is "
"inconsistent", vgname);
return NULL;
}
return vg;
}
}
return NULL;
}
/* Only called by activate.c */
struct logical_volume *lv_from_lvid(struct cmd_context *cmd, const char *lvid_s,
unsigned precommitted)
{
struct lv_list *lvl;
struct volume_group *vg;
const union lvid *lvid;
lvid = (const union lvid *) lvid_s;
log_very_verbose("Finding volume group for uuid %s", lvid_s);
if (!(vg = _vg_read_by_vgid(cmd, (char *)lvid->id[0].uuid, precommitted))) {
log_error("Volume group for uuid not found: %s", lvid_s);
return NULL;
}
log_verbose("Found volume group \"%s\"", vg->name);
if (vg->status & EXPORTED_VG) {
log_error("Volume group \"%s\" is exported", vg->name);
return NULL;
}
if (!(lvl = find_lv_in_vg_by_lvid(vg, lvid))) {
log_very_verbose("Can't find logical volume id %s", lvid_s);
return NULL;
}
return lvl->lv;
}
/**
* pv_read - read and return a handle to a physical volume
* @cmd: LVM command initiating the pv_read
* @pv_name: full device name of the PV, including the path
* @mdas: list of metadata areas of the PV
* @label_sector: sector number where the PV label is stored on @pv_name
* @warnings:
*
* Returns:
* PV handle - valid pv_name and successful read of the PV, or
* NULL - invalid parameter or error in reading the PV
*
* Note:
* FIXME - liblvm todo - make into function that returns handle
*/
struct physical_volume *pv_read(struct cmd_context *cmd, const char *pv_name,
struct dm_list *mdas, uint64_t *label_sector,
int warnings)
{
return _pv_read(cmd, pv_name, mdas, label_sector, warnings);
}
/* FIXME Use label functions instead of PV functions */
static struct physical_volume *_pv_read(struct cmd_context *cmd,
const char *pv_name,
struct dm_list *mdas,
uint64_t *label_sector,
int warnings)
{
struct physical_volume *pv;
struct label *label;
struct lvmcache_info *info;
struct device *dev;
if (!(dev = dev_cache_get(pv_name, cmd->filter)))
return_NULL;
if (!(label_read(dev, &label, UINT64_C(0)))) {
if (warnings)
log_error("No physical volume label read from %s",
pv_name);
return NULL;
}
info = (struct lvmcache_info *) label->info;
if (label_sector && *label_sector)
*label_sector = label->sector;
if (!(pv = dm_pool_zalloc(cmd->mem, sizeof(*pv)))) {
log_error("pv allocation for '%s' failed", pv_name);
return NULL;
}
dm_list_init(&pv->tags);
dm_list_init(&pv->segments);
/* FIXME Move more common code up here */
if (!(info->fmt->ops->pv_read(info->fmt, pv_name, pv, mdas))) {
log_error("Failed to read existing physical volume '%s'",
pv_name);
return NULL;
}
if (!pv->size)
return NULL;
if (!alloc_pv_segment_whole_pv(cmd->mem, pv))
return_NULL;
return pv;
}
/* May return empty list */
struct dm_list *get_vgnames(struct cmd_context *cmd, int full_scan)
{
return lvmcache_get_vgnames(cmd, full_scan);
}
struct dm_list *get_vgids(struct cmd_context *cmd, int full_scan)
{
return lvmcache_get_vgids(cmd, full_scan);
}
static int _get_pvs(struct cmd_context *cmd, struct dm_list **pvslist)
{
struct str_list *strl;
struct dm_list * uninitialized_var(results);
const char *vgname, *vgid;
struct dm_list *pvh, *tmp;
struct dm_list *vgids;
struct volume_group *vg;
int consistent = 0;
int old_pvmove;
lvmcache_label_scan(cmd, 0);
if (pvslist) {
if (!(results = dm_pool_alloc(cmd->mem, sizeof(*results)))) {
log_error("PV list allocation failed");
return 0;
}
dm_list_init(results);
}
/* Get list of VGs */
if (!(vgids = get_vgids(cmd, 0))) {
log_error("get_pvs: get_vgids failed");
return 0;
}
/* Read every VG to ensure cache consistency */
/* Orphan VG is last on list */
old_pvmove = pvmove_mode();
init_pvmove(1);
dm_list_iterate_items(strl, vgids) {
vgid = strl->str;
if (!vgid)
continue; /* FIXME Unnecessary? */
consistent = 0;
if (!(vgname = vgname_from_vgid(NULL, vgid))) {
stack;
continue;
}
if (!(vg = vg_read_internal(cmd, vgname, vgid, &consistent))) {
stack;
continue;
}
if (!consistent)
log_warn("WARNING: Volume Group %s is not consistent",
vgname);
/* Move PVs onto results list */
if (pvslist)
dm_list_iterate_safe(pvh, tmp, &vg->pvs)
dm_list_add(results, pvh);
}
init_pvmove(old_pvmove);
if (pvslist)
*pvslist = results;
else
dm_pool_free(cmd->mem, vgids);
return 1;
}
struct dm_list *get_pvs(struct cmd_context *cmd)
{
struct dm_list *results;
if (!_get_pvs(cmd, &results))
return NULL;
return results;
}
int scan_vgs_for_pvs(struct cmd_context *cmd)
{
return _get_pvs(cmd, NULL);
}
/* FIXME: liblvm todo - make into function that takes handle */
int pv_write(struct cmd_context *cmd __attribute((unused)),
struct physical_volume *pv,
struct dm_list *mdas, int64_t label_sector)
{
return _pv_write(cmd, pv, mdas, label_sector);
}
static int _pv_write(struct cmd_context *cmd __attribute((unused)),
struct physical_volume *pv,
struct dm_list *mdas, int64_t label_sector)
{
if (!pv->fmt->ops->pv_write) {
log_error("Format does not support writing physical volumes");
return 0;
}
if (!is_orphan_vg(pv->vg_name) || pv->pe_alloc_count) {
log_error("Assertion failed: can't _pv_write non-orphan PV "
"(in VG %s)", pv->vg_name);
return 0;
}
if (!pv->fmt->ops->pv_write(pv->fmt, pv, mdas, label_sector))
return_0;
return 1;
}
int pv_write_orphan(struct cmd_context *cmd, struct physical_volume *pv)
{
const char *old_vg_name = pv->vg_name;
pv->vg_name = cmd->fmt->orphan_vg_name;
pv->status = ALLOCATABLE_PV;
pv->pe_alloc_count = 0;
if (!dev_get_size(pv->dev, &pv->size)) {
log_error("%s: Couldn't get size.", pv_dev_name(pv));
return 0;
}
if (!_pv_write(cmd, pv, NULL, INT64_C(-1))) {
log_error("Failed to clear metadata from physical "
"volume \"%s\" after removal from \"%s\"",
pv_dev_name(pv), old_vg_name);
return 0;
}
return 1;
}
/**
* is_orphan_vg - Determine whether a vg_name is an orphan
* @vg_name: pointer to the vg_name
*/
int is_orphan_vg(const char *vg_name)
{
return (vg_name && vg_name[0] == ORPHAN_PREFIX[0]) ? 1 : 0;
}
/**
* is_orphan - Determine whether a pv is an orphan based on its vg_name
* @pv: handle to the physical volume
*/
int is_orphan(const pv_t *pv)
{
return is_orphan_vg(pv_field(pv, vg_name));
}
/**
* is_pv - Determine whether a pv is a real pv or dummy one
* @pv: handle to device
*/
int is_pv(pv_t *pv)
{
return (pv_field(pv, vg_name) ? 1 : 0);
}
/*
* Returns:
* 0 - fail
* 1 - success
*/
int pv_analyze(struct cmd_context *cmd, const char *pv_name,
uint64_t label_sector)
{
struct label *label;
struct device *dev;
struct metadata_area *mda;
struct lvmcache_info *info;
dev = dev_cache_get(pv_name, cmd->filter);
if (!dev) {
log_error("Device %s not found (or ignored by filtering).",
pv_name);
return 0;
}
/*
* First, scan for LVM labels.
*/
if (!label_read(dev, &label, label_sector)) {
log_error("Could not find LVM label on %s",
pv_name);
return 0;
}
log_print("Found label on %s, sector %"PRIu64", type=%s",
pv_name, label->sector, label->type);
/*
* Next, loop through metadata areas
*/
info = label->info;
dm_list_iterate_items(mda, &info->mdas)
mda->ops->pv_analyze_mda(info->fmt, mda);
return 1;
}
/*
* Performs a set of checks against a VG according to bits set in status
* and returns FAILED_* bits for those that aren't acceptable.
*
* FIXME Remove the unnecessary duplicate definitions and return bits directly.
*/
static uint32_t _vg_bad_status_bits(const struct volume_group *vg,
uint32_t status)
{
uint32_t failure = 0;
if ((status & CLUSTERED) &&
(vg_is_clustered(vg)) && !locking_is_clustered() &&
!lockingfailed()) {
log_error("Skipping clustered volume group %s", vg->name);
/* Return because other flags are considered undefined. */
return FAILED_CLUSTERED;
}
if ((status & EXPORTED_VG) &&
(vg->status & EXPORTED_VG)) {
log_error("Volume group %s is exported", vg->name);
failure |= FAILED_EXPORTED;
}
if ((status & LVM_WRITE) &&
!(vg->status & LVM_WRITE)) {
log_error("Volume group %s is read-only", vg->name);
failure |= FAILED_READ_ONLY;
}
if ((status & RESIZEABLE_VG) &&
!(vg->status & RESIZEABLE_VG)) {
log_error("Volume group %s is not resizeable.", vg->name);
failure |= FAILED_RESIZEABLE;
}
return failure;
}
/**
* vg_check_status - check volume group status flags and log error
* @vg - volume group to check status flags
* @status - specific status flags to check (e.g. EXPORTED_VG)
*/
int vg_check_status(const struct volume_group *vg, uint32_t status)
{
return !_vg_bad_status_bits(vg, status);
}
/*
* vg_lock_and_read - consolidate vg locking, reading, and status flag checking
*
* Returns:
* NULL - failure
* non-NULL - success; volume group handle
*/
vg_t *vg_lock_and_read(struct cmd_context *cmd, const char *vg_name,
const char *vgid,
uint32_t lock_flags, uint32_t status_flags,
uint32_t misc_flags)
{
struct volume_group *vg;
int consistent = 1;
if (!(misc_flags & CORRECT_INCONSISTENT))
consistent = 0;
if (!validate_name(vg_name)) {
log_error("Volume group name %s has invalid characters",
vg_name);
return NULL;
}
if (!lock_vol(cmd, vg_name, lock_flags)) {
log_error("Can't get lock for %s", vg_name);
return NULL;
}
if (!(vg = vg_read_internal(cmd, vg_name, vgid, &consistent)) ||
((misc_flags & FAIL_INCONSISTENT) && !consistent)) {
log_error("Volume group \"%s\" not found", vg_name);
unlock_vg(cmd, vg_name);
return NULL;
}
if (!vg_check_status(vg, status_flags)) {
unlock_vg(cmd, vg_name);
return NULL;
}
return vg;
}
/*
* Create a (vg_t) volume group handle from a struct volume_group pointer and a
* possible failure code or zero for success.
*/
static vg_t *_vg_make_handle(struct cmd_context *cmd,
struct volume_group *vg,
uint32_t failure)
{
if (!vg && !(vg = dm_pool_zalloc(cmd->mem, sizeof(*vg)))) {
log_error("Error allocating vg handle.");
return_NULL;
}
vg->read_status = failure;
return (vg_t *)vg;
}
static vg_t *_recover_vg(struct cmd_context *cmd, const char *lock_name,
const char *vg_name, const char *vgid,
uint32_t lock_flags)
{
int consistent = 1;
struct volume_group *vg;
lock_flags &= ~LCK_TYPE_MASK;
lock_flags |= LCK_WRITE;
unlock_vg(cmd, lock_name);
dev_close_all();
if (!lock_vol(cmd, lock_name, lock_flags))
return_NULL;
if (!(vg = vg_read_internal(cmd, vg_name, vgid, &consistent)))
return_NULL;
if (!consistent)
return_NULL;
return (vg_t *)vg;
}
/*
* Consolidated locking, reading, and status flag checking.
*
* If the metadata is inconsistent, setting READ_ALLOW_INCONSISTENT in
* misc_flags will return it with FAILED_INCONSISTENT set instead of
* giving you nothing.
*
* Use vg_read_error(vg) to determine the result. Nonzero means there were
* problems reading the volume group.
* Zero value means that the VG is open and appropriate locks are held.
*/
static vg_t *_vg_lock_and_read(struct cmd_context *cmd, const char *vg_name,
const char *vgid, uint32_t lock_flags,
uint32_t status_flags, uint32_t misc_flags)
{
struct volume_group *vg = 0;
const char *lock_name;
int consistent = 1;
int consistent_in;
uint32_t failure = 0;
int already_locked;
if (misc_flags & READ_ALLOW_INCONSISTENT || !(lock_flags & LCK_WRITE))
consistent = 0;
if (!validate_name(vg_name) && !is_orphan_vg(vg_name)) {
log_error("Volume group name %s has invalid characters",
vg_name);
return NULL;
}
lock_name = is_orphan_vg(vg_name) ? VG_ORPHANS : vg_name;
already_locked = vgname_is_locked(lock_name);
if (!already_locked && !lock_vol(cmd, lock_name, lock_flags)) {
log_error("Can't get lock for %s", vg_name);
return _vg_make_handle(cmd, vg, FAILED_LOCKING);
}
if (is_orphan_vg(vg_name))
status_flags &= ~LVM_WRITE;
if (misc_flags & READ_CHECK_EXISTENCE)
consistent = 0;
consistent_in = consistent;
/* If consistent == 1, we get NULL here if correction fails. */
if (!(vg = vg_read_internal(cmd, vg_name, vgid, &consistent))) {
if (consistent_in && !consistent) {
log_error("Volume group \"%s\" inconsistent.", vg_name);
failure |= FAILED_INCONSISTENT;
goto_bad;
}
if (!(misc_flags & READ_CHECK_EXISTENCE))
log_error("Volume group \"%s\" not found", vg_name);
else
failure |= READ_CHECK_EXISTENCE;
failure |= FAILED_NOTFOUND;
goto_bad;
}
if (vg_is_clustered(vg) && !locking_is_clustered()) {
log_error("Skipping clustered volume group %s", vg->name);
failure |= FAILED_CLUSTERED;
goto_bad;
}
/* consistent == 0 when VG is not found, but failed == FAILED_NOTFOUND */
if (!consistent && !failure)
if (!(vg = _recover_vg(cmd, lock_name, vg_name, vgid, lock_flags))) {
log_error("Recovery of volume group \"%s\" failed.",
vg_name);
failure |= FAILED_INCONSISTENT;
goto_bad;
}
failure |= _vg_bad_status_bits(vg, status_flags & ~CLUSTERED);
if (failure)
goto_bad;
return _vg_make_handle(cmd, vg, failure);
bad:
if (failure != (FAILED_NOTFOUND | READ_CHECK_EXISTENCE) &&
!(misc_flags & LOCK_KEEP) && !already_locked)
unlock_vg(cmd, lock_name);
return _vg_make_handle(cmd, vg, failure);
}
/*
* vg_read: High-level volume group metadata read function.
*
* vg_read_error() must be used on any handle returned to check for errors.
*
* - metadata inconsistent and automatic correction failed: FAILED_INCONSISTENT
* - VG is read-only: FAILED_READ_ONLY
* - VG is EXPORTED, unless flags has READ_ALLOW_EXPORTED: FAILED_EXPORTED
* - VG is not RESIZEABLE, unless flags has ALLOW_NONRESIZEABLE:
* FAILED_RESIZEABLE
* - locking failed: FAILED_LOCKING
*
* On failures, all locks are released, unless LOCK_KEEP has been supplied.
*
* Volume groups are opened read-only unless flags contains READ_FOR_UPDATE.
*
* Checking for VG existence:
*
* If READ_CHECK_EXISTENCE is set in flags, if the VG exists, a non-NULL struct
* volume_group will be returned every time, but if it has INCONSISTENT_VG set,
* the other fields will be uninitialized. You must check for INCONSISTENT_VG
* if passing READ_CHECK_EXISTENCE. You also must not use it if it has
* INCONSISTENT_VG set.
*
* FIXME: We want vg_read to attempt automatic recovery after acquiring a
* temporary write lock: if that fails, we bail out as usual, with failed &
* FAILED_INCONSISTENT. If it works, we are good to go. Code that's been in
* toollib just set lock_flags to LCK_VG_WRITE and called vg_read_internal with
* *consistent = 1.
*/
vg_t *vg_read(struct cmd_context *cmd, const char *vg_name,
const char *vgid, uint32_t flags)
{
uint32_t status = CLUSTERED;
uint32_t lock_flags = LCK_VG_READ;
if (flags & READ_FOR_UPDATE) {
status |= EXPORTED_VG | LVM_WRITE;
lock_flags = LCK_VG_WRITE;
}
if (flags & READ_ALLOW_EXPORTED)
status &= ~EXPORTED_VG;
if (flags & READ_REQUIRE_RESIZEABLE)
status |= RESIZEABLE_VG;
if (flags & LOCK_NONBLOCKING)
lock_flags |= LCK_NONBLOCK;
return _vg_lock_and_read(cmd, vg_name, vgid, lock_flags, status, flags);
}
/*
* A high-level volume group metadata reading function. Open a volume group for
* later update (this means the user code can change the metadata and later
* request the new metadata to be written and committed).
*/
vg_t *vg_read_for_update(struct cmd_context *cmd, const char *vg_name,
const char *vgid, uint32_t flags)
{
return vg_read(cmd, vg_name, vgid, flags | READ_FOR_UPDATE);
}
/*
* Test the validity of a VG handle returned by vg_read() or vg_read_for_update().
*
* If READ_CHECK_EXISTENCE was supplied the non-existence of the volume group
* is not considered an error.
*
* !vg_read_error() && vg_might_exist() => valid handle to VG.
* vg_read_error() && vg_might_exist() => handle invalid, but VG might
* exist but cannot be read.
* !vg_read_error() && !vg_might_exist() => the VG does not exist
* vg_read_error() && !vg_might_exist() is impossible.
*/
uint32_t vg_read_error(vg_t *vg_handle)
{
if (!vg_handle)
return FAILED_ALLOCATION;
if (vg_handle->read_status & READ_CHECK_EXISTENCE)
return vg_handle->read_status &
~(READ_CHECK_EXISTENCE | FAILED_NOTFOUND);
return vg_handle->read_status;
}
/*
* Returns true if the volume group already exists.
* If unsure, it will return true. It might exist but the read failed
* for some other reason.
*/
uint32_t vg_might_exist(vg_t *vg_handle)
{
if (!vg_handle)
return 1;
if (vg_handle->read_status == (FAILED_NOTFOUND | READ_CHECK_EXISTENCE))
return 0;
return 1;
}
/*
* Gets/Sets for external LVM library
*/
struct id pv_id(const pv_t *pv)
{
return pv_field(pv, id);
}
const struct format_type *pv_format_type(const pv_t *pv)
{
return pv_field(pv, fmt);
}
struct id pv_vgid(const pv_t *pv)
{
return pv_field(pv, vgid);
}
struct device *pv_dev(const pv_t *pv)
{
return pv_field(pv, dev);
}
const char *pv_vg_name(const pv_t *pv)
{
return pv_field(pv, vg_name);
}
const char *pv_dev_name(const pv_t *pv)
{
return dev_name(pv_dev(pv));
}
uint64_t pv_size(const pv_t *pv)
{
return pv_field(pv, size);
}
uint32_t pv_status(const pv_t *pv)
{
return pv_field(pv, status);
}
uint32_t pv_pe_size(const pv_t *pv)
{
return pv_field(pv, pe_size);
}
uint64_t pv_pe_start(const pv_t *pv)
{
return pv_field(pv, pe_start);
}
uint32_t pv_pe_count(const pv_t *pv)
{
return pv_field(pv, pe_count);
}
uint32_t pv_pe_alloc_count(const pv_t *pv)
{
return pv_field(pv, pe_alloc_count);
}
uint32_t vg_status(const vg_t *vg)
{
return vg->status;
}
/**
* pv_by_path - Given a device path return a PV handle if it is a PV
* @cmd - handle to the LVM command instance
* @pv_name - device path to read for the PV
*
* Returns:
* NULL - device path does not contain a valid PV
* non-NULL - PV handle corresponding to device path
*
* FIXME: merge with find_pv_by_name ?
*/
pv_t *pv_by_path(struct cmd_context *cmd, const char *pv_name)
{
struct dm_list mdas;
dm_list_init(&mdas);
return _pv_read(cmd, pv_name, &mdas, NULL, 1);
}
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