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lvm2/lib/metadata/metadata.c
Milan Broz d396100278 Use readahead of underlying device and not default (smaller) one. 
When we are stacking LV over device, which has for some reason
increased read_ahead (e.g. MD RAID), the read_ahead hint
for libdevmapper is wrong (it is zero).

If the calculated read_ahead hint is zero, patch uses read_ahead of underlying device
(if first segment is PV) when setting DM_READ_AHEAD_MINIMUM_FLAG.

Because we are using dev-cache, it also store this value to cache for future use
(if several LVs are over one PV, BLKRAGET is called only once for underlying device.)

This should fix all the reamining problems with readahead mismatch reported
for DM over MD configurations (and similar cases).
2009-05-20 11:09:49 +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,
struct dm_pool *pvmem,
const char *pv_name,
struct dm_list *mdas,
uint64_t *label_sector,
int warnings, int scan_label_only);
static struct physical_volume *_pv_create(const struct format_type *fmt,
struct device *dev,
struct id *id, uint64_t size,
unsigned long data_alignment,
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 set_pe_align(struct physical_volume *pv, unsigned long data_alignment)
{
if (pv->pe_align)
goto out;
if (data_alignment)
pv->pe_align = data_alignment;
else
pv->pe_align = MAX(65536UL, lvm_getpagesize()) >> SECTOR_SHIFT;
if (!pv->dev)
goto out;
/*
* Align to chunk size of underlying md device if present
*/
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 = vg->vgmem;
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;
/*
* 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, 0UL, 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 dm_pool *pvmem,
struct physical_volume *pv_to,
struct physical_volume *pv_from)
{
memcpy(pv_to, pv_from, sizeof(*pv_to));
if (!(pv_to->vg_name = dm_pool_strdup(pvmem, pv_from->vg_name)))
return_0;
if (!str_list_dup(pvmem, &pv_to->tags, &pv_from->tags))
return_0;
if (!peg_dup(pvmem, &pv_to->segments, &pv_from->segments))
return_0;
return 1;
}
static struct pv_list *_copy_pvl(struct dm_pool *pvmem, struct pv_list *pvl_from)
{
struct pv_list *pvl_to = NULL;
if (!(pvl_to = dm_pool_zalloc(pvmem, sizeof(*pvl_to))))
return_NULL;
if (!(pvl_to->pv = dm_pool_alloc(pvmem, sizeof(*pvl_to->pv))))
goto_bad;
if(!_copy_pv(pvmem, pvl_to->pv, pvl_from->pv))
goto_bad;
return pvl_to;
bad:
dm_pool_free(pvmem, pvl_to);
return NULL;
}
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 r = 0, 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(fmt->cmd->mem, pv, pvl->pv)) {
log_error("internal PV duplication failed");
r = 0;
goto out;
}
r = 1;
goto out;
}
}
out:
vg_release(vg);
return r;
}
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 = vg->vgmem;
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 = vg_visible_lvs(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 = vg_visible_lvs(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;
int consistent = 0;
struct dm_pool *mem;
/* is this vg name already in use ? */
if ((vg = vg_read_internal(cmd, vg_name, NULL, &consistent))) {
log_err("A volume group called '%s' already exists.", vg_name);
vg_release(vg);
return NULL;
}
if (!(mem = dm_pool_create("lvm2 vg_create", VG_MEMPOOL_CHUNK)))
return_NULL;
if (!(vg = dm_pool_zalloc(mem, sizeof(*vg))))
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->vgmem = mem;
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);
dm_list_init(&vg->lvs);
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_destroy(mem);
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
* @data_alignment: requested alignment of data
* @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,
unsigned long data_alignment,
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, data_alignment, 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,
unsigned long data_alignment,
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;
}
if (pv->size < data_alignment) {
log_error("%s: Data alignment must not exceed device size.",
pv_dev_name(pv));
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, data_alignment,
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, cmd->mem, pv_name, NULL, NULL, 1, 0))) {
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, cmd->mem, pv_name, NULL, NULL, 1, 0))) {
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;
dm_list_iterate_items(seg, &lv->segments)
return seg;
return NULL;
}
/* 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 snapshot_count(const struct volume_group *vg)
{
struct lv_list *lvl;
unsigned num_snapshots = 0;
dm_list_iterate_items(lvl, &vg->lvs)
if (lv_is_cow(lvl->lv))
num_snapshots++;
return num_snapshots;
}
unsigned vg_visible_lvs(const struct volume_group *vg)
{
struct lv_list *lvl;
unsigned lv_count = 0;
dm_list_iterate_items(lvl, &vg->lvs) {
if (lv_is_visible(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_visible_lvs(vg_to) + vg_visible_lvs(vg_from))) {
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;
}
/*
* Be sure that all PV devices have cached read ahead in dev-cache
* Currently it takes read_ahead from first PV segment only
*/
static int _lv_read_ahead_single(struct logical_volume *lv, void *data)
{
struct lv_segment *seg = first_seg(lv);
uint32_t seg_read_ahead = 0, *read_ahead = data;
if (seg && seg_type(seg, 0) == AREA_PV)
dev_get_read_ahead(seg_pv(seg, 0)->dev, &seg_read_ahead);
if (seg_read_ahead > *read_ahead)
*read_ahead = seg_read_ahead;
return 1;
}
uint32_t lv_calculate_readhead(const struct logical_volume *lv)
{
uint32_t read_ahead = 0;
if (lv->read_ahead == DM_READ_AHEAD_AUTO)
_lv_postorder((struct logical_volume *)lv, _lv_read_ahead_single, &read_ahead);
log_debug("Calculated readahead of LV %s is %u", lv->name, read_ahead);
return read_ahead;
}
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;
}
/*
* Count all non-snapshot invisible LVs
*/
lv_count = 0;
dm_list_iterate_items(lvl, &vg->lvs) {
if (lvl->lv->status & VISIBLE_LV)
continue;
/* snapshots */
if (lv_is_cow(lvl->lv) || lv_is_origin(lvl->lv))
continue;
/* count other non-snapshot invisible volumes */
lv_count++;
/*
* FIXME: add check for unreferenced invisible LVs
* - snapshot cow & origin
* - mirror log & images
* - mirror conversion volumes (_mimagetmp*)
*/
}
/*
* all volumes = visible LVs + snapshot_cows + invisible LVs
*/
if (((uint32_t) dm_list_size(&vg->lvs)) !=
vg_visible_lvs(vg) + snapshot_count(vg) + lv_count) {
log_error("Internal error: #internal LVs (%u) != #LVs (%"
PRIu32 ") + #snapshots (%" PRIu32 ") + #invisible LVs %u in VG %s",
dm_list_size(&vg->lvs), vg_visible_lvs(vg),
snapshot_count(vg), lv_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;
}
if (vg_max_lv_reached(vg))
stack;
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;
struct dm_pool *mem;
lvmcache_label_scan(cmd, 0);
if (!(vginfo = vginfo_from_vgname(orphan_vgname, NULL)))
return_NULL;
if (!(mem = dm_pool_create("vg_read orphan", VG_MEMPOOL_CHUNK)))
return_NULL;
if (!(vg = dm_pool_zalloc(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->vgmem = mem;
vg->cmd = cmd;
if (!(vg->name = dm_pool_strdup(mem, orphan_vgname))) {
log_error("vg name allocation failed");
goto bad;
}
/* 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");
goto bad;
}
dm_list_iterate_items(info, &vginfo->infos) {
if (!(pv = _pv_read(cmd, mem, dev_name(info->dev), NULL, NULL, 1, 0))) {
continue;
}
if (!(pvl = dm_pool_zalloc(mem, sizeof(*pvl)))) {
log_error("pv_list allocation failed");
goto bad;
}
pvl->pv = pv;
dm_list_add(&vg->pvs, &pvl->list);
vg->pv_count++;
}
return vg;
bad:
dm_pool_destroy(mem);
return NULL;
}
static int _update_pv_list(struct dm_pool *pvmem, 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.
*/
if (!(pvl2 = _copy_pvl(pvmem, pvl))) {
log_error("pv_list allocation for '%s' failed",
pv_dev_name(pvl->pv));
return 0;
}
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;
vg_release(vg);
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) {
vg_release(correct_vg);
correct_vg = vg;
}
}
if (vg != correct_vg)
vg_release(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 {
vg_release(correct_vg);
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);
vg_release(correct_vg);
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(cmd->mem, &all_pvs, correct_vg)) {
vg_release(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(cmd->mem, &all_pvs, vg)) {
vg_release(vg);
vg_release(correct_vg);
return_NULL;
}
if (vg->seqno > correct_vg->seqno) {
vg_release(correct_vg);
correct_vg = vg;
}
}
if (vg != correct_vg)
vg_release(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);
vg_release(correct_vg);
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");
vg_release(correct_vg);
return NULL;
}
if (!vg_commit(correct_vg)) {
log_error("Automatic metadata correction commit "
"failed");
vg_release(correct_vg);
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))) {
vg_release(correct_vg);
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)) {
vg_release(correct_vg);
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.");
vg_release(correct_vg);
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);
vg_release(vg);
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);
vg_release(vg);
return NULL;
}
}
return vg;
}
void vg_release(struct volume_group *vg)
{
if (!vg || !vg->vgmem)
return;
if (vg->vgmem == vg->cmd->mem)
log_error("Internal error: global memory pool used for VG %s",
vg->name);
dm_pool_destroy(vg->vgmem);
}
/* 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 = NULL;
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;
}
vg_release(vg);
}
/* Mustn't scan if memory locked: ensure cache gets pre-populated! */
if (memlock())
goto out;
/* 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");
goto out;
}
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);
goto out;
}
return vg;
}
}
out:
vg_release(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);
goto out;
}
if (!(lvl = find_lv_in_vg_by_lvid(vg, lvid))) {
log_very_verbose("Can't find logical volume id %s", lvid_s);
goto out;
}
return lvl->lv;
out:
vg_release(vg);
return NULL;
}
/**
* 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, int scan_label_only)
{
return _pv_read(cmd, cmd->mem, pv_name, mdas, label_sector, warnings, scan_label_only);
}
/* FIXME Use label functions instead of PV functions */
static struct physical_volume *_pv_read(struct cmd_context *cmd,
struct dm_pool *pvmem,
const char *pv_name,
struct dm_list *mdas,
uint64_t *label_sector,
int warnings, int scan_label_only)
{
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(pvmem, 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,
scan_label_only))) {
log_error("Failed to read existing physical volume '%s'",
pv_name);
return NULL;
}
if (!pv->size)
return NULL;
if (!alloc_pv_segment_whole_pv(pvmem, 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 pv_list *pvl, *pvl_copy;
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_items(pvl, &vg->pvs) {
if (!(pvl_copy = _copy_pvl(cmd->mem, pvl))) {
log_error("PV list allocation failed");
vg_release(vg);
return 0;
}
dm_list_add(results, &pvl_copy->list);
}
vg_release(vg);
}
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_release_vg(cmd, vg, vg_name);
return NULL;
}
if (!vg_check_status(vg, status_flags)) {
unlock_release_vg(cmd, vg, 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)
{
struct dm_pool *vgmem;
if (!vg) {
if (!(vgmem = dm_pool_create("lvm2 vg_handle", VG_MEMPOOL_CHUNK)) ||
!(vg = dm_pool_zalloc(vgmem, sizeof(*vg)))) {
log_error("Error allocating vg handle.");
if (vgmem)
dm_pool_destroy(vgmem);
return_NULL;
}
vg->vgmem = vgmem;
}
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) {
vg_release(vg);
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 = NULL;
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) {
vg_release(vg);
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, cmd->mem, pv_name, &mdas, NULL, 1, 0);
}
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