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1c916ec5ff
lvm2/lib/metadata/merge.c
Heinz Mauelshagen 3da5cdc5dc Fix typo
2017-05-24 13:47:45 +02:00

886 lines
26 KiB
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/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2017 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "lib.h"
#include <defaults.h>
#include "metadata.h"
#include "lv_alloc.h"
#include "pv_alloc.h"
#include "str_list.h"
#include "segtype.h"
/*
* Attempt to merge two adjacent segments.
* Currently only supports striped segments on AREA_PV.
* Returns success if successful, in which case 'first'
* gets adjusted to contain both areas.
*/
static int _merge(struct lv_segment *first, struct lv_segment *second)
{
if (!first || !second || first->segtype != second->segtype ||
!first->segtype->ops->merge_segments)
return 0;
return first->segtype->ops->merge_segments(first, second);
}
int lv_merge_segments(struct logical_volume *lv)
{
struct dm_list *segh, *t;
struct lv_segment *seg, *current, *prev = NULL;
/*
* Don't interfere with pvmoves as they rely upon two LVs
* having a matching segment structure.
*/
if (lv_is_locked(lv) || lv_is_pvmove(lv))
return 1;
if (lv_is_mirror_image(lv) &&
(seg = get_only_segment_using_this_lv(lv)) &&
(lv_is_locked(seg->lv) || lv_is_pvmove(seg->lv)))
return 1;
dm_list_iterate_safe(segh, t, &lv->segments) {
current = dm_list_item(segh, struct lv_segment);
if (_merge(prev, current))
dm_list_del(&current->list);
else
prev = current;
}
return 1;
}
#define ERROR_MAX 100
#define inc_error_count \
if (error_count++ > ERROR_MAX) \
goto out
#define seg_error(msg) { \
log_error("LV %s, segment %u invalid: %s for %s segment.", \
seg->lv->name, seg_count, (msg), lvseg_name(seg)); \
if ((*error_count)++ > ERROR_MAX) \
return; \
}
/*
* RAID segment property checks.
*
* Checks in here shall catch any
* bogus segment structure setup.
*/
#define raid_seg_error(msg) { \
log_error("LV %s invalid: %s for %s segment", \
seg->lv->name, (msg), lvseg_name(seg)); \
if ((*error_count)++ > ERROR_MAX) \
return; \
}
#define raid_seg_error_val(msg, val) { \
log_error("LV %s invalid: %s (is %u) for %s segment", \
seg->lv->name, (msg), (val), lvseg_name(seg)); \
if ((*error_count)++ > ERROR_MAX) \
return; \
}
/* Check raid0 segment properties in @seg */
static void _check_raid0_seg(struct lv_segment *seg, int *error_count)
{
if (seg_is_raid0_meta(seg) &&
!seg->meta_areas)
raid_seg_error("no meta areas");
if (!seg_is_raid0_meta(seg) &&
seg->meta_areas)
raid_seg_error("meta areas");
if (!seg->stripe_size)
raid_seg_error("zero stripe size");
if (!is_power_of_2(seg->stripe_size))
raid_seg_error_val("non power of 2 stripe size", seg->stripe_size);
if (seg->region_size)
raid_seg_error_val("non-zero region_size", seg->region_size);
if (seg->writebehind)
raid_seg_error_val("non-zero write behind", seg->writebehind);
if (seg->min_recovery_rate)
raid_seg_error_val("non-zero min recovery rate", seg->min_recovery_rate);
if (seg->max_recovery_rate)
raid_seg_error_val("non-zero max recovery rate", seg->max_recovery_rate);
}
/* Check RAID @seg for non-zero, power of 2 region size and min recovery rate <= max */
static void _check_raid_region_recovery(struct lv_segment *seg, int *error_count)
{
if (!seg->region_size)
raid_seg_error("zero region_size");
if (!is_power_of_2(seg->region_size))
raid_seg_error_val("non power of 2 region size", seg->region_size);
/* min/max recovery rate may be zero but min may not be larger than max if set */
if (seg->max_recovery_rate &&
seg->min_recovery_rate > seg->max_recovery_rate)
raid_seg_error_val("min recovery larger than max recovery", seg->min_recovery_rate);
}
/* Check raid1 segment properties in @seg */
static void _check_raid1_seg(struct lv_segment *seg, int *error_count)
{
if (!seg->meta_areas)
raid_seg_error("no meta areas");
if (seg->stripe_size)
raid_seg_error_val("non-zero stripe size", seg->stripe_size);
_check_raid_region_recovery(seg, error_count);
}
/* Check raid4/5/6/10 segment properties in @seg */
static void _check_raid45610_seg(struct lv_segment *seg, int *error_count)
{
/* Checks applying to any raid4/5/6/10 */
/*
* Allow raid4 + raid5_n to get activated w/o metadata.
*
* This is mandatory during conversion between them,
* because switching the dedicated parity SubLVs
* beginning <-> end changes the roles of all SubLVs
* which the kernel would reject.
*/
if (!(seg_is_raid4(seg) || seg_is_raid5_n(seg)) && !seg->meta_areas)
raid_seg_error("no meta areas");
if (!seg->stripe_size)
raid_seg_error("zero stripe size");
if (!is_power_of_2(seg->stripe_size))
raid_seg_error_val("non power of 2 stripe size", seg->stripe_size);
_check_raid_region_recovery(seg, error_count);
/* END: checks applying to any raid4/5/6/10 */
/* Specific checks per raid level */
if (seg_is_raid4(seg) ||
seg_is_any_raid5(seg)) {
/*
* To allow for takeover between the MD raid1 and
* raid4/5 personalities, exactly 2 areas (i.e. DataLVs)
* can be mirrored by all raid1, raid4 and raid5 personalities.
* Hence allow a minimum of 2 areas.
*/
if (seg->area_count < 2)
raid_seg_error_val("minimum 2 areas required", seg->area_count);
} else if (seg_is_any_raid6(seg)) {
/*
* FIXME: MD raid6 supports a minimum of 4 areas.
* LVM requests a minimum of 5 due to easier
* processing of SubLVs to replace.
*
* Once that obstacle got removed, allow for a minimum of 4.
*/
if (seg->area_count < 5)
raid_seg_error_val("minimum 5 areas required", seg->area_count);
} else if (seg_is_raid10(seg)) {
/*
* FIXME: raid10 area_count minimum has to change to 2 once we
* support data_copies and odd numbers of stripes
*/
if (seg->area_count < 4)
raid_seg_error_val("minimum 4 areas required", seg->area_count);
if (seg->writebehind)
raid_seg_error_val("non-zero writebehind", seg->writebehind);
}
}
/* Check any non-RAID segment struct members in @seg and increment @error_count for any bogus ones */
static void _check_non_raid_seg_members(struct lv_segment *seg, int *error_count)
{
if (seg->origin) /* snap and thin */
raid_seg_error("non-zero origin LV");
if (seg->cow) /* snap */
raid_seg_error("non-zero cow LV");
if (!dm_list_empty(&seg->origin_list)) /* snap */
raid_seg_error("non-zero origin_list");
/* replicator members (deprecated) */
if (seg->replicator)
raid_seg_error("non-zero replicator");
if (seg->rlog_lv)
raid_seg_error("non-zero rlog LV");
if (seg->rlog_type)
raid_seg_error("non-zero rlog type");
if (seg->rdevice_index_highest)
raid_seg_error("non-zero rdevice_index_highests");
if (seg->rsite_index_highest)
raid_seg_error("non-zero rsite_index_highests");
/* .... more members? */
}
/*
* Check RAID segment struct members of @seg for acceptable
* properties and increment @error_count for any bogus ones.
*/
static void _check_raid_seg(struct lv_segment *seg, int *error_count)
{
uint32_t area_len, s;
/* General checks applying to all RAIDs */
if (!seg->area_count)
raid_seg_error("zero area count");
if (!seg->areas)
raid_seg_error("zero areas");
if (seg->extents_copied > seg->len)
raid_seg_error_val("extents_copied too large", seg->extents_copied);
/* Default < 10, change once raid1 split shift and rename SubLVs works! */
if (seg_is_raid1(seg)) {
if (seg->area_count > DEFAULT_RAID1_MAX_IMAGES) {
log_error("LV %s invalid: maximum supported areas %u (is %u) for %s segment",
seg->lv->name, DEFAULT_RAID1_MAX_IMAGES, seg->area_count, lvseg_name(seg));
if ((*error_count)++ > ERROR_MAX)
return;
}
} else if (seg->area_count > DEFAULT_RAID_MAX_IMAGES) {
log_error("LV %s invalid: maximum supported areas %u (is %u) for %s segment",
seg->lv->name, DEFAULT_RAID_MAX_IMAGES, seg->area_count, lvseg_name(seg));
if ((*error_count)++ > ERROR_MAX)
return;
}
/* FIXME: should we check any non-RAID segment struct members at all? */
_check_non_raid_seg_members(seg, error_count);
/* Check for any DataLV flaws like non-existing ones or size variations */
for (area_len = s = 0; s < seg->area_count; s++) {
if (seg_type(seg, s) != AREA_LV)
raid_seg_error("no DataLV");
if (!lv_is_raid_image(seg_lv(seg, s)))
raid_seg_error("DataLV without RAID image flag");
if (area_len &&
area_len != seg_lv(seg, s)->le_count) {
raid_seg_error_val("DataLV size variations",
seg_lv(seg, s)->le_count);
} else
area_len = seg_lv(seg, s)->le_count;
}
/* Check for any MetaLV flaws like non-existing ones or size variations */
if (seg->meta_areas)
for (area_len = s = 0; s < seg->area_count; s++) {
if (seg_metatype(seg, s) != AREA_LV) {
raid_seg_error("no MetaLV");
continue;
}
if (!lv_is_raid_metadata(seg_metalv(seg, s)))
raid_seg_error("MetaLV without RAID metadata flag");
if (area_len &&
area_len != seg_metalv(seg, s)->le_count) {
raid_seg_error_val("MetaLV size variations",
seg_metalv(seg, s)->le_count);
} else
area_len = seg_metalv(seg, s)->le_count;
}
/* END: general checks applying to all RAIDs */
/* Specific segment type checks from here on */
if (seg_is_any_raid0(seg))
_check_raid0_seg(seg, error_count);
else if (seg_is_raid1(seg))
_check_raid1_seg(seg, error_count);
else if (seg_is_raid4(seg) ||
seg_is_any_raid5(seg) ||
seg_is_any_raid6(seg) ||
seg_is_raid10(seg))
_check_raid45610_seg(seg, error_count);
else
raid_seg_error("bogus RAID segment type");
}
/* END: RAID segment property checks. */
static void _check_lv_segment(struct logical_volume *lv, struct lv_segment *seg,
unsigned seg_count, int *error_count)
{
struct lv_segment *seg2;
if (lv_is_mirror_image(lv) &&
(!(seg2 = find_mirror_seg(seg)) || !seg_is_mirrored(seg2)))
seg_error("mirror image is not mirrored");
if (seg_is_cache(seg)) {
if (!lv_is_cache(lv))
seg_error("is not flagged as cache LV");
if (!seg->pool_lv) {
seg_error("is missing cache pool LV");
} else if (!lv_is_cache_pool(seg->pool_lv))
seg_error("is not referencing cache pool LV");
} else { /* !cache */
if (seg->cleaner_policy)
seg_error("sets cleaner_policy");
}
if (seg_is_cache_pool(seg)) {
if (!dm_list_empty(&seg->lv->segs_using_this_lv)) {
switch (seg->cache_metadata_format) {
case CACHE_METADATA_FORMAT_2:
case CACHE_METADATA_FORMAT_1:
break;
default:
seg_error("has invalid cache metadata format");
}
switch (seg->cache_mode) {
case CACHE_MODE_WRITETHROUGH:
case CACHE_MODE_WRITEBACK:
case CACHE_MODE_PASSTHROUGH:
break;
default:
seg_error("has invalid cache's feature flag")
}
if (!seg->policy_name)
seg_error("is missing cache policy name");
}
if (!validate_cache_chunk_size(lv->vg->cmd, seg->chunk_size))
seg_error("has invalid chunk size.");
if (seg->lv->status & LV_METADATA_FORMAT) {
if (seg->cache_metadata_format != CACHE_METADATA_FORMAT_2)
seg_error("sets METADATA_FORMAT flag");
} else if (seg->cache_metadata_format == CACHE_METADATA_FORMAT_2)
seg_error("is missing METADATA_FORMAT flag");
} else { /* !cache_pool */
if (seg->cache_metadata_format)
seg_error("sets cache metadata format");
if (seg->cache_mode)
seg_error("sets cache mode");
if (seg->policy_name)
seg_error("sets policy name");
if (seg->policy_settings)
seg_error("sets policy settings");
if (seg->lv->status & LV_METADATA_FORMAT)
seg_error("sets METADATA_FORMAT flag");
}
if (!seg_can_error_when_full(seg) && lv_is_error_when_full(lv))
seg_error("does not support flag ERROR_WHEN_FULL.");
if (seg_is_mirrored(seg)) {
/* Check mirror log - which is attached to the mirrored seg */
if (seg->log_lv) {
if (!lv_is_mirror_log(seg->log_lv))
seg_error("log LV is not a mirror log");
if (!(seg2 = first_seg(seg->log_lv)) || (find_mirror_seg(seg2) != seg))
seg_error("log LV does not point back to mirror segment");
}
} else { /* !mirrored */
if (seg->log_lv) {
if (lv_is_raid_image(lv))
seg_error("log LV is not a mirror log or a RAID image");
}
}
if (seg_is_raid(seg))
_check_raid_seg(seg, error_count);
if (seg_is_pool(seg)) {
if ((seg->area_count != 1) || (seg_type(seg, 0) != AREA_LV)) {
seg_error("is missing a pool data LV");
} else if (!(seg2 = first_seg(seg_lv(seg, 0))) || (find_pool_seg(seg2) != seg))
seg_error("data LV does not refer back to pool LV");
if (!seg->metadata_lv) {
seg_error("is missing a pool metadata LV");
} else if (!(seg2 = first_seg(seg->metadata_lv)) || (find_pool_seg(seg2) != seg))
seg_error("metadata LV does not refer back to pool LV");
} else { /* !thin_pool && !cache_pool */
if (seg->metadata_lv)
seg_error("must not have pool metadata LV set");
}
if (seg_is_thin_pool(seg)) {
if (!lv_is_thin_pool(lv))
seg_error("is not flagged as thin pool LV");
if (lv_is_thin_volume(lv))
seg_error("is a thin volume that must not contain thin pool segment");
if (!validate_thin_pool_chunk_size(lv->vg->cmd, seg->chunk_size))
seg_error("has invalid chunk size.");
if (seg->zero_new_blocks != THIN_ZERO_YES &&
seg->zero_new_blocks != THIN_ZERO_NO)
seg_error("zero_new_blocks is invalid");
} else { /* !thin_pool */
if (seg->zero_new_blocks != THIN_ZERO_UNSELECTED)
seg_error("sets zero_new_blocks");
if (seg->discards != THIN_DISCARDS_UNSELECTED)
seg_error("sets discards");
if (!dm_list_empty(&seg->thin_messages))
seg_error("sets thin_messages list");
}
if (seg_is_thin_volume(seg)) {
if (!lv_is_thin_volume(lv))
seg_error("is not flagged as thin volume LV");
if (lv_is_thin_pool(lv))
seg_error("is a thin pool that must not contain thin volume segment");
if (!seg->pool_lv) {
seg_error("is missing thin pool LV");
} else if (!lv_is_thin_pool(seg->pool_lv))
seg_error("is not referencing thin pool LV");
if (seg->device_id > DM_THIN_MAX_DEVICE_ID)
seg_error("has too large device id");
if (seg->external_lv &&
!lv_is_external_origin(seg->external_lv))
seg_error("external LV is not flagged as a external origin LV");
if (seg->merge_lv) {
if (!lv_is_thin_volume(seg->merge_lv))
seg_error("merge LV is not flagged as a thin LV");
if (!lv_is_merging_origin(seg->merge_lv))
seg_error("merge LV is not flagged as merging");
}
} else { /* !thin */
if (seg->device_id)
seg_error("sets device_id");
if (seg->external_lv)
seg_error("sets external LV");
if (seg->merge_lv)
seg_error("sets merge LV");
if (seg->indirect_origin)
seg_error("sets indirect_origin LV");
}
/* Some multi-seg vars excluded here */
if (!seg_is_cache(seg) &&
!seg_is_thin_volume(seg)) {
if (seg->pool_lv)
seg_error("sets pool LV");
}
if (!seg_is_pool(seg) &&
/* FIXME: format_pool/import_export.c _add_linear_seg() sets chunk_size */
!seg_is_linear(seg) &&
!seg_is_snapshot(seg)) {
if (seg->chunk_size)
seg_error("sets chunk_size");
}
if (!seg_is_thin_pool(seg) &&
!seg_is_thin_volume(seg)) {
if (seg->transaction_id)
seg_error("sets transaction_id");
}
if (!seg_unknown(seg)) {
if (seg->segtype_private)
seg_error("set segtype_private");
}
}
/*
* Verify that an LV's segments are consecutive, complete and don't overlap.
*/
int check_lv_segments(struct logical_volume *lv, int complete_vg)
{
struct lv_segment *seg, *seg2;
uint32_t le = 0;
unsigned seg_count = 0, seg_found, external_lv_found = 0;
uint32_t data_rimage_count, s;
struct seg_list *sl;
struct glv_list *glvl;
int error_count = 0;
struct replicator_site *rsite;
struct replicator_device *rdev;
dm_list_iterate_items(seg, &lv->segments) {
seg_count++;
if (seg->lv != lv) {
log_error("LV %s invalid: segment %u is referencing different LV.",
lv->name, seg_count);
inc_error_count;
}
if (seg->le != le) {
log_error("LV %s invalid: segment %u should begin at "
"LE %" PRIu32 " (found %" PRIu32 ").",
lv->name, seg_count, le, seg->le);
inc_error_count;
}
data_rimage_count = seg->area_count - seg->segtype->parity_devs;
/* FIXME: raid varies seg->area_len? */
if (seg->len != seg->area_len &&
seg->len != seg->area_len * data_rimage_count) {
log_error("LV %s: segment %u with len=%u "
" has inconsistent area_len %u",
lv->name, seg_count, seg->len, seg->area_len);
inc_error_count;
}
if (seg_is_snapshot(seg)) {
if (seg->cow && seg->cow == seg->origin) {
log_error("LV %s: segment %u has same LV %s for "
"both origin and snapshot",
lv->name, seg_count, seg->cow->name);
inc_error_count;
}
}
if (seg_is_replicator(seg) && !check_replicator_segment(seg))
inc_error_count;
if (complete_vg)
_check_lv_segment(lv, seg, seg_count, &error_count);
for (s = 0; s < seg->area_count; s++) {
if (seg_type(seg, s) == AREA_UNASSIGNED) {
log_error("LV %s: segment %u has unassigned "
"area %u.",
lv->name, seg_count, s);
inc_error_count;
} else if (seg_type(seg, s) == AREA_PV) {
if (!seg_pvseg(seg, s) ||
seg_pvseg(seg, s)->lvseg != seg ||
seg_pvseg(seg, s)->lv_area != s) {
log_error("LV %s: segment %u has "
"inconsistent PV area %u",
lv->name, seg_count, s);
inc_error_count;
}
} else {
if (!seg_lv(seg, s) ||
seg_lv(seg, s)->vg != lv->vg ||
seg_lv(seg, s) == lv) {
log_error("LV %s: segment %u has "
"inconsistent LV area %u",
lv->name, seg_count, s);
inc_error_count;
}
if (complete_vg && seg_lv(seg, s) &&
lv_is_mirror_image(seg_lv(seg, s)) &&
(!(seg2 = find_seg_by_le(seg_lv(seg, s),
seg_le(seg, s))) ||
find_mirror_seg(seg2) != seg)) {
log_error("LV %s: segment %u mirror "
"image %u missing mirror ptr",
lv->name, seg_count, s);
inc_error_count;
}
/* FIXME I don't think this ever holds?
if (seg_le(seg, s) != le) {
log_error("LV %s: segment %u has "
"inconsistent LV area %u "
"size",
lv->name, seg_count, s);
inc_error_count;
}
*/
seg_found = 0;
dm_list_iterate_items(sl, &seg_lv(seg, s)->segs_using_this_lv)
if (sl->seg == seg)
seg_found++;
if (!seg_found) {
log_error("LV %s segment %u uses LV %s,"
" but missing ptr from %s to %s",
lv->name, seg_count,
seg_lv(seg, s)->name,
seg_lv(seg, s)->name, lv->name);
inc_error_count;
} else if (seg_found > 1) {
log_error("LV %s has duplicated links "
"to LV %s segment %u",
seg_lv(seg, s)->name,
lv->name, seg_count);
inc_error_count;
}
}
if (complete_vg &&
seg_is_mirrored(seg) && !seg_is_raid(seg) &&
seg_type(seg, s) == AREA_LV &&
seg_lv(seg, s)->le_count != seg->area_len) {
log_error("LV %s: mirrored LV segment %u has "
"wrong size %u (should be %u).",
lv->name, s, seg_lv(seg, s)->le_count,
seg->area_len);
inc_error_count;
}
}
le += seg->len;
}
if (le != lv->le_count) {
log_error("LV %s: inconsistent LE count %u != %u",
lv->name, le, lv->le_count);
inc_error_count;
}
dm_list_iterate_items(sl, &lv->segs_using_this_lv) {
seg = sl->seg;
seg_found = 0;
for (s = 0; s < seg->area_count; s++) {
if (seg_type(seg, s) != AREA_LV)
continue;
if (lv == seg_lv(seg, s))
seg_found++;
if (seg->meta_areas && seg_is_raid_with_meta(seg) && (lv == seg_metalv(seg, s)))
seg_found++;
}
if (seg_is_replicator_dev(seg)) {
dm_list_iterate_items(rsite, &seg->replicator->rsites) {
dm_list_iterate_items(rdev, &rsite->rdevices) {
if (lv == rdev->lv || lv == rdev->slog)
seg_found++;
}
}
if (lv == seg->replicator)
seg_found++;
}
if (seg_is_replicator(seg) && lv == seg->rlog_lv)
seg_found++;
if (seg->log_lv == lv)
seg_found++;
if (seg->metadata_lv == lv || seg->pool_lv == lv)
seg_found++;
if (seg_is_thin_volume(seg) && (seg->origin == lv || seg->external_lv == lv))
seg_found++;
if (!seg_found) {
log_error("LV %s is used by LV %s:%" PRIu32 "-%" PRIu32
", but missing ptr from %s to %s",
lv->name, seg->lv->name, seg->le,
seg->le + seg->len - 1,
seg->lv->name, lv->name);
inc_error_count;
} else if (seg_found != sl->count) {
log_error("Reference count mismatch: LV %s has %u "
"links to LV %s:%" PRIu32 "-%" PRIu32
", which has %u links",
lv->name, sl->count, seg->lv->name, seg->le,
seg->le + seg->len - 1, seg_found);
inc_error_count;
}
seg_found = 0;
dm_list_iterate_items(seg2, &seg->lv->segments)
if (seg == seg2) {
seg_found++;
break;
}
if (!seg_found) {
log_error("LV segment %s:%" PRIu32 "-%" PRIu32
" is incorrectly listed as being used by LV %s",
seg->lv->name, seg->le, seg->le + seg->len - 1,
lv->name);
inc_error_count;
}
/* Validation of external origin counter */
if (seg->external_lv == lv)
external_lv_found++;
}
dm_list_iterate_items(glvl, &lv->indirect_glvs) {
if (glvl->glv->is_historical) {
if (glvl->glv->historical->indirect_origin != lv->this_glv) {
log_error("LV %s is indirectly used by historical LV %s"
"but that historical LV does not point back to LV %s",
lv->name, glvl->glv->historical->name, lv->name);
inc_error_count;
}
} else {
if (!(seg = first_seg(glvl->glv->live)) ||
seg->indirect_origin != lv->this_glv) {
log_error("LV %s is indirectly used by LV %s"
"but that LV does not point back to LV %s",
lv->name, glvl->glv->live->name, lv->name);
inc_error_count;
}
}
}
/* Check LV flags match first segment type */
if (complete_vg) {
if ((seg_count != 1) &&
(lv_is_cache(lv) ||
lv_is_cache_pool(lv) ||
lv_is_raid(lv) ||
lv_is_snapshot(lv) ||
lv_is_thin_pool(lv) ||
lv_is_thin_volume(lv))) {
log_error("LV %s must have exactly one segment.",
lv->name);
inc_error_count;
}
if (lv_is_pool_data(lv) &&
(!(seg2 = first_seg(lv)) || !(seg2 = find_pool_seg(seg2)) ||
seg2->area_count != 1 || seg_type(seg2, 0) != AREA_LV ||
seg_lv(seg2, 0) != lv)) {
log_error("LV %s: segment 1 pool data LV does not point back to same LV",
lv->name);
inc_error_count;
}
if (lv_is_thin_pool_metadata(lv) && !strstr(lv->name, "_tmeta")) {
log_error("LV %s: thin pool metadata LV does not use _tmeta.",
lv->name);
inc_error_count;
} else if (lv_is_cache_pool_metadata(lv) && !strstr(lv->name, "_cmeta")) {
log_error("LV %s: cache pool metadata LV does not use _cmeta.",
lv->name);
inc_error_count;
}
if (lv_is_external_origin(lv)) {
if (lv->external_count != external_lv_found) {
log_error("LV %s: external origin count does not match.",
lv->name);
inc_error_count;
}
if (lv->status & LVM_WRITE) {
log_error("LV %s: external origin cant't be writable.",
lv->name);
inc_error_count;
}
}
}
out:
return !error_count;
}
/*
* Split the supplied segment at the supplied logical extent
* NB Use LE numbering that works across stripes PV1: 0,2,4 PV2: 1,3,5 etc.
*/
static int _lv_split_segment(struct logical_volume *lv, struct lv_segment *seg,
uint32_t le)
{
struct lv_segment *split_seg;
uint32_t s;
uint32_t offset = le - seg->le;
uint32_t area_offset;
if (!seg_can_split(seg)) {
log_error("Unable to split the %s segment at LE %" PRIu32
" in LV %s", lvseg_name(seg), le, lv->name);
return 0;
}
/* Clone the existing segment */
if (!(split_seg = alloc_lv_segment(seg->segtype,
seg->lv, seg->le, seg->len, seg->reshape_len,
seg->status, seg->stripe_size,
seg->log_lv,
seg->area_count, seg->area_len, seg->data_copies,
seg->chunk_size, seg->region_size,
seg->extents_copied, seg->pvmove_source_seg))) {
log_error("Couldn't allocate cloned LV segment.");
return 0;
}
if (!str_list_dup(lv->vg->vgmem, &split_seg->tags, &seg->tags)) {
log_error("LV segment tags duplication failed");
return 0;
}
/* In case of a striped segment, the offset has to be / stripes */
area_offset = offset;
if (seg_is_striped(seg))
area_offset /= seg->area_count;
split_seg->area_len -= area_offset;
seg->area_len = area_offset;
split_seg->len -= offset;
seg->len = offset;
split_seg->le = seg->le + seg->len;
/* Adjust the PV mapping */
for (s = 0; s < seg->area_count; s++) {
seg_type(split_seg, s) = seg_type(seg, s);
/* Split area at the offset */
switch (seg_type(seg, s)) {
case AREA_LV:
if (!set_lv_segment_area_lv(split_seg, s, seg_lv(seg, s),
seg_le(seg, s) + seg->area_len, 0))
return_0;
log_debug_alloc("Split %s:%u[%u] at %u: %s LE %u", lv->name,
seg->le, s, le, seg_lv(seg, s)->name,
seg_le(split_seg, s));
break;
case AREA_PV:
if (!(seg_pvseg(split_seg, s) =
assign_peg_to_lvseg(seg_pv(seg, s),
seg_pe(seg, s) +
seg->area_len,
seg_pvseg(seg, s)->len -
seg->area_len,
split_seg, s)))
return_0;
log_debug_alloc("Split %s:%u[%u] at %u: %s PE %u", lv->name,
seg->le, s, le,
dev_name(seg_dev(seg, s)),
seg_pe(split_seg, s));
break;
case AREA_UNASSIGNED:
log_error("Unassigned area %u found in segment", s);
return 0;
}
}
/* Add split off segment to the list _after_ the original one */
dm_list_add_h(&seg->list, &split_seg->list);
return 1;
}
/*
* Ensure there's a segment boundary at the given logical extent
*/
int lv_split_segment(struct logical_volume *lv, uint32_t le)
{
struct lv_segment *seg;
if (!(seg = find_seg_by_le(lv, le))) {
log_error("Segment with extent %" PRIu32 " in LV %s not found",
le, lv->name);
return 0;
}
/* This is a segment start already */
if (le == seg->le)
return 1;
if (!_lv_split_segment(lv, seg, le))
return_0;
if (!vg_validate(lv->vg))
return_0;
return 1;
}
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