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lvm2/lib/metadata/merge.c
Alasdair G Kergon 8c872852cd metadata: Tidy merge.c
2016-05-24 00:57:48 +01:00

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/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2016 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 "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
/*
* 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;
uint32_t area_multiplier, s;
struct seg_list *sl;
struct glv_list *glvl;
int error_count = 0;
struct replicator_site *rsite;
struct replicator_device *rdev;
/* Check LV flags match first segment type */
if (complete_vg) {
if (lv_is_thin_volume(lv)) {
if (dm_list_size(&lv->segments) != 1) {
log_error("LV %s is thin volume without exactly one segment.",
lv->name);
inc_error_count;
} else if (!seg_is_thin_volume(first_seg(lv))) {
log_error("LV %s is thin volume without first thin volume segment.",
lv->name);
inc_error_count;
}
}
if (lv_is_thin_pool(lv)) {
if (dm_list_size(&lv->segments) != 1) {
log_error("LV %s is thin pool volume without exactly one segment.",
lv->name);
inc_error_count;
} else if (!seg_is_thin_pool(first_seg(lv))) {
log_error("LV %s is thin pool without first thin pool 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_pool_metadata(lv)) {
if (!(seg2 = first_seg(lv)) || !(seg2 = find_pool_seg(seg2)) ||
seg2->metadata_lv != lv) {
log_error("LV %s: segment 1 pool metadata 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;
}
}
}
dm_list_iterate_items(seg, &lv->segments) {
seg_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;
}
area_multiplier = segtype_is_striped(seg->segtype) ?
seg->area_count : 1;
if (seg->area_len * area_multiplier != seg->len) {
log_error("LV %s: segment %u has inconsistent "
"area_len %u",
lv->name, seg_count, seg->area_len);
inc_error_count;
}
if (lv_is_error_when_full(lv) &&
!seg_can_error_when_full(seg)) {
log_error("LV %s: segment %u (%s) does not support flag "
"ERROR_WHEN_FULL.", lv->name, seg_count, seg->segtype->name);
inc_error_count;
}
if (complete_vg && seg->log_lv &&
!seg_is_mirrored(seg) && !(seg->status & RAID_IMAGE)) {
log_error("LV %s: segment %u log LV %s is not a "
"mirror log or a RAID image",
lv->name, seg_count, seg->log_lv->name);
inc_error_count;
}
/*
* Check mirror log - which is attached to the mirrored seg
*/
if (complete_vg && seg->log_lv && seg_is_mirrored(seg)) {
if (!lv_is_mirror_log(seg->log_lv)) {
log_error("LV %s: segment %u log LV %s is not "
"a mirror log",
lv->name, seg_count, seg->log_lv->name);
inc_error_count;
}
if (!(seg2 = first_seg(seg->log_lv)) ||
find_mirror_seg(seg2) != seg) {
log_error("LV %s: segment %u log LV does not "
"point back to mirror segment",
lv->name, seg_count);
inc_error_count;
}
}
if (complete_vg && seg->status & MIRROR_IMAGE) {
if (!find_mirror_seg(seg) ||
!seg_is_mirrored(find_mirror_seg(seg))) {
log_error("LV %s: segment %u mirror image "
"is not mirrored",
lv->name, seg_count);
inc_error_count;
}
}
/* Check the various thin segment types */
if (complete_vg) {
if (seg_is_thin_pool(seg)) {
if (!lv_is_thin_pool(lv)) {
log_error("LV %s is missing thin pool flag for segment %u",
lv->name, seg_count);
inc_error_count;
}
if (lv_is_thin_volume(lv)) {
log_error("LV %s is a thin volume that must not contain thin pool segment %u",
lv->name, seg_count);
inc_error_count;
}
}
if (seg_is_cache_pool(seg) &&
!dm_list_empty(&seg->lv->segs_using_this_lv)) {
switch (seg->cache_mode) {
case CACHE_MODE_WRITETHROUGH:
case CACHE_MODE_WRITEBACK:
case CACHE_MODE_PASSTHROUGH:
break;
default:
log_error("LV %s has invalid cache's feature flag.",
lv->name);
inc_error_count;
}
if (!seg->policy_name) {
log_error("LV %s is missing cache policy name.", lv->name);
inc_error_count;
}
}
if (seg_is_pool(seg)) {
if (seg->area_count != 1 ||
seg_type(seg, 0) != AREA_LV) {
log_error("LV %s: %s segment %u is missing a pool data LV",
lv->name, seg->segtype->name, seg_count);
inc_error_count;
} else if (!(seg2 = first_seg(seg_lv(seg, 0))) || find_pool_seg(seg2) != seg) {
log_error("LV %s: %s segment %u data LV does not refer back to pool LV",
lv->name, seg->segtype->name, seg_count);
inc_error_count;
}
if (!seg->metadata_lv) {
log_error("LV %s: %s segment %u is missing a pool metadata LV",
lv->name, seg->segtype->name, seg_count);
inc_error_count;
} else if (!(seg2 = first_seg(seg->metadata_lv)) ||
find_pool_seg(seg2) != seg) {
log_error("LV %s: %s segment %u metadata LV does not refer back to pool LV",
lv->name, seg->segtype->name, seg_count);
inc_error_count;
}
if (!validate_pool_chunk_size(lv->vg->cmd, seg->segtype, seg->chunk_size)) {
log_error("LV %s: %s segment %u has invalid chunk size %u.",
lv->name, seg->segtype->name, seg_count, seg->chunk_size);
inc_error_count;
}
} else {
if (seg->metadata_lv) {
log_error("LV %s: segment %u must not have pool metadata LV set",
lv->name, seg_count);
inc_error_count;
}
}
if (seg_is_thin_volume(seg)) {
if (!lv_is_thin_volume(lv)) {
log_error("LV %s is missing thin volume flag for segment %u",
lv->name, seg_count);
inc_error_count;
}
if (lv_is_thin_pool(lv)) {
log_error("LV %s is a thin pool that must not contain thin volume segment %u",
lv->name, seg_count);
inc_error_count;
}
if (!seg->pool_lv) {
log_error("LV %s: segment %u is missing thin pool LV",
lv->name, seg_count);
inc_error_count;
} else if (!lv_is_thin_pool(seg->pool_lv)) {
log_error("LV %s: thin volume segment %u pool LV is not flagged as a pool LV",
lv->name, seg_count);
inc_error_count;
}
if (seg->device_id > DM_THIN_MAX_DEVICE_ID) {
log_error("LV %s: thin volume segment %u has too large device id %u",
lv->name, seg_count, seg->device_id);
inc_error_count;
}
if (seg->external_lv && (seg->external_lv->status & LVM_WRITE)) {
log_error("LV %s: external origin %s is writable.",
lv->name, seg->external_lv->name);
inc_error_count;
}
if (seg->merge_lv) {
if (!lv_is_thin_volume(seg->merge_lv)) {
log_error("LV %s: thin volume segment %u merging LV %s is not flagged as a thin LV",
lv->name, seg_count, seg->merge_lv->name);
inc_error_count;
}
if (!lv_is_merging_origin(seg->merge_lv)) {
log_error("LV %s: merging LV %s is not flagged as merging.",
lv->name, seg->merge_lv->name);
inc_error_count;
}
}
} else if (seg_is_cache(seg)) {
if (!lv_is_cache(lv)) {
log_error("LV %s is missing cache flag for segment %u",
lv->name, seg_count);
inc_error_count;
}
if (!seg->pool_lv) {
log_error("LV %s: segment %u is missing cache_pool LV",
lv->name, seg_count);
inc_error_count;
}
} else {
if (seg->pool_lv) {
log_error("LV %s: segment %u must not have pool LV set",
lv->name, seg_count);
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;
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;
}
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_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;
}
}
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;
}
}
}
if (le != lv->le_count) {
log_error("LV %s: inconsistent LE count %u != %u",
lv->name, le, lv->le_count);
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->status, seg->stripe_size,
seg->log_lv,
seg->area_count, seg->area_len,
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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