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1a4f13eb6e
lvm2/lib/metadata/mirror.c
Zdenek Kabelac a7404b5b83 debug: stack tracing corrections
2016-11-23 17:55:03 +01:00

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61 KiB
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/*
* Copyright (C) 2003-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2008 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 "toolcontext.h"
#include "segtype.h"
#include "display.h"
#include "archiver.h"
#include "activate.h"
#include "lv_alloc.h"
#include "lvm-string.h"
#include "str_list.h"
#include "locking.h" /* FIXME Should not be used in this file */
#include "defaults.h" /* FIXME: should this be defaults.h? */
/* These are necessary for _write_log_header() */
#include "xlate.h"
#define MIRROR_MAGIC 0x4D695272
#define MIRROR_DISK_VERSION 2
/* These are the flags that represent the mirror failure restoration policies */
#define MIRROR_REMOVE 0
#define MIRROR_ALLOCATE 1
#define MIRROR_ALLOCATE_ANYWHERE 2
/*
* Returns true if the lv is temporary mirror layer for resync
*/
int is_temporary_mirror_layer(const struct logical_volume *lv)
{
if (lv_is_mirror_image(lv) && lv_is_mirrored(lv) && !lv_is_locked(lv))
return 1;
return 0;
}
/*
* Return a temporary LV for resyncing added mirror image.
* Add other mirror legs to lvs list.
*/
struct logical_volume *find_temporary_mirror(const struct logical_volume *lv)
{
struct lv_segment *seg;
if (!lv_is_mirrored(lv))
return NULL;
seg = first_seg(lv);
/* Temporary mirror is always area_num == 0 */
if (seg_type(seg, 0) == AREA_LV &&
is_temporary_mirror_layer(seg_lv(seg, 0)))
return seg_lv(seg, 0);
return NULL;
}
/*
* cluster_mirror_is_available
*
* Check if the proper kernel module and log daemon are running.
* Caller should check for 'vg_is_clustered(lv->vg)' before making
* this call.
*
* Returns: 1 if available, 0 otherwise
*/
int cluster_mirror_is_available(struct cmd_context *cmd)
{
unsigned attr = 0;
const struct segment_type *segtype;
if (!(segtype = get_segtype_from_string(cmd, SEG_TYPE_NAME_MIRROR)))
return_0;
if (!segtype->ops->target_present)
return_0;
if (!segtype->ops->target_present(cmd, NULL, &attr))
return_0;
if (!(attr & MIRROR_LOG_CLUSTERED))
return 0;
return 1;
}
/*
* Returns the number of mirrors of the LV
*/
uint32_t lv_mirror_count(const struct logical_volume *lv)
{
struct lv_segment *seg;
uint32_t s, mirrors;
if (!lv_is_mirrored(lv))
return 1;
seg = first_seg(lv);
/* FIXME: RAID10 only supports 2 copies right now */
if (seg_is_raid10(seg))
return 2;
if (lv_is_pvmove(lv))
return seg->area_count;
mirrors = 0;
for (s = 0; s < seg->area_count; s++) {
if (seg_type(seg, s) != AREA_LV)
continue;
if (is_temporary_mirror_layer(seg_lv(seg, s)))
mirrors += lv_mirror_count(seg_lv(seg, s));
else
mirrors++;
}
return mirrors ? mirrors : 1;
}
struct lv_segment *find_mirror_seg(struct lv_segment *seg)
{
struct lv_segment *mirror_seg;
if (!(mirror_seg = get_only_segment_using_this_lv(seg->lv))) {
log_error("Failed to find mirror_seg for %s", display_lvname(seg->lv));
return NULL;
}
if (!seg_is_mirrored(mirror_seg)) {
log_error("LV %s on %s is not a mirror segments.",
display_lvname(mirror_seg->lv),
display_lvname(seg->lv));
return NULL;
}
return mirror_seg;
}
/*
* Reduce the region size if necessary to ensure
* the volume size is a multiple of the region size.
*
* For internal use only log only in verbose mode
*/
uint32_t adjusted_mirror_region_size(uint32_t extent_size, uint32_t extents,
uint32_t region_size, int internal, int clustered)
{
uint64_t region_max;
uint64_t region_min, region_min_pow2;
region_max = (UINT64_C(1) << (ffs((int)extents) - 1)) * (UINT64_C(1) << (ffs((int)extent_size) - 1));
if (region_max < UINT32_MAX && region_size > region_max) {
region_size = (uint32_t) region_max;
if (!internal)
log_print_unless_silent("Using reduced mirror region size of %"
PRIu32 " sectors.", region_size);
else
log_verbose("Using reduced mirror region size of %"
PRIu32 " sectors.", region_size);
}
#ifdef CMIRROR_REGION_COUNT_LIMIT
if (clustered) {
/*
* The CPG code used by cluster mirrors can only handle a
* payload of < 1MB currently. (This deficiency is tracked by
* http://bugzilla.redhat.com/682771.) The region size for cluster
* mirrors must be restricted in such a way as to limit the
* size of the bitmap to < 512kB, because there are two bitmaps
* which get sent around during checkpointing while a cluster
* mirror starts up. Ergo, the number of regions must not
* exceed 512k * 8. We also need some room for the other
* checkpointing structures as well, so we reduce by another
* factor of two.
*
* This code should be removed when the CPG restriction is
* lifted.
*/
region_min = (uint64_t) extents * extent_size / CMIRROR_REGION_COUNT_LIMIT;
region_min_pow2 = 1;
while (region_min_pow2 < region_min)
region_min_pow2 *= 2;
if (region_size < region_min_pow2) {
if (internal)
log_print_unless_silent("Increasing mirror region size from %"
PRIu32 " to %" PRIu64 " sectors.",
region_size, region_min_pow2);
else
log_verbose("Increasing mirror region size from %"
PRIu32 " to %" PRIu64 " sectors.",
region_size, region_min_pow2);
region_size = region_min_pow2;
}
}
#endif /* CMIRROR_REGION_COUNT_LIMIT */
return region_size;
}
/*
* shift_mirror_images
* @mirrored_seg
* @mimage: The position (index) of the image to move to the end
*
* When dealing with removal of legs, we often move a 'removable leg'
* to the back of the 'areas' array. It is critically important not
* to simply swap it for the last area in the array. This would have
* the affect of reordering the remaining legs - altering position of
* the primary. So, we must shuffle all of the areas in the array
* to maintain their relative position before moving the 'removable
* leg' to the end.
*
* Short illustration of the problem:
* - Mirror consists of legs A, B, C and we want to remove A
* - We swap A and C and then remove A, leaving C, B
* This scenario is problematic in failure cases where A dies, because
* B becomes the primary. If the above happens, we effectively throw
* away any changes made between the time of failure and the time of
* restructuring the mirror.
*
* So, any time we want to move areas to the end to be removed, use
* this function.
*/
int shift_mirror_images(struct lv_segment *mirrored_seg, unsigned mimage)
{
unsigned i;
struct lv_segment_area area;
if (mimage >= mirrored_seg->area_count) {
log_error("Invalid index (%u) of mirror image supplied "
"to shift_mirror_images().", mimage);
return 0;
}
area = mirrored_seg->areas[mimage];
/* Shift remaining images down to fill the hole */
for (i = mimage + 1; i < mirrored_seg->area_count; i++)
mirrored_seg->areas[i-1] = mirrored_seg->areas[i];
/* Place this one at the end */
mirrored_seg->areas[i-1] = area;
return 1;
}
/*
* This function writes a new header to the mirror log header to the lv
*
* Returns: 1 on success, 0 on failure
*/
static int _write_log_header(struct cmd_context *cmd, struct logical_volume *lv)
{
struct device *dev;
char *name;
struct { /* The mirror log header */
uint32_t magic;
uint32_t version;
uint64_t nr_regions;
} log_header;
log_header.magic = xlate32(MIRROR_MAGIC);
log_header.version = xlate32(MIRROR_DISK_VERSION);
log_header.nr_regions = xlate64((uint64_t)-1);
if (!(name = dm_pool_alloc(cmd->mem, PATH_MAX))) {
log_error("Name allocation failed - log header not written (%s).",
display_lvname(lv));
return 0;
}
if (dm_snprintf(name, PATH_MAX, "%s%s/%s", cmd->dev_dir,
lv->vg->name, lv->name) < 0) {
log_error("Name too long - log header not written (%s).",
display_lvname(lv));
return 0;
}
log_verbose("Writing log header to device %s.", display_lvname(lv));
if (!(dev = dev_cache_get(name, NULL))) {
log_error("%s: not found: log header not written.", name);
return 0;
}
if (!dev_open_quiet(dev))
return 0;
if (!dev_write(dev, UINT64_C(0), sizeof(log_header), &log_header)) {
log_error("Failed to write log header to %s.", name);
dev_close_immediate(dev);
return 0;
}
dev_close_immediate(dev);
return 1;
}
/*
* Initialize mirror log contents
*/
static int _init_mirror_log(struct cmd_context *cmd,
struct logical_volume *log_lv, int in_sync,
struct dm_list *tagsl, int remove_on_failure)
{
struct dm_str_list *sl;
uint64_t orig_status = log_lv->status;
int was_active = 0;
if (test_mode()) {
log_verbose("Test mode: Skipping mirror log initialisation.");
return 1;
}
if (!activation() && in_sync) {
log_error("Aborting. Unable to create in-sync mirror log "
"while activation is disabled.");
return 0;
}
/* If the LV is active, deactivate it first. */
if (lv_is_active(log_lv)) {
(void) deactivate_lv(cmd, log_lv);
/*
* FIXME: workaround to fail early
* Ensure that log is really deactivated because deactivate_lv
* on cluster do not fail if there is log_lv with different UUID.
*/
if (lv_is_active(log_lv)) {
log_error("Aborting. Unable to deactivate mirror log.");
goto revert_new_lv;
}
was_active = 1;
}
/* Temporary make it visible for set_lv() */
lv_set_visible(log_lv);
/* Temporary tag mirror log for activation */
dm_list_iterate_items(sl, tagsl)
if (!str_list_add(cmd->mem, &log_lv->tags, sl->str)) {
log_error("Aborting. Unable to tag mirror log.");
goto activate_lv;
}
/* store mirror log on disk(s) */
if (!vg_write(log_lv->vg) || !vg_commit(log_lv->vg))
goto activate_lv;
backup(log_lv->vg);
/* Wait for events following any deactivation before reactivating */
if (!sync_local_dev_names(cmd)) {
log_error("Aborting. Failed to sync local devices before initialising mirror log %s.",
display_lvname(log_lv));
goto revert_new_lv;
}
if (!activate_lv(cmd, log_lv)) {
log_error("Aborting. Failed to activate mirror log.");
goto revert_new_lv;
}
/* Remove the temporary tags */
dm_list_iterate_items(sl, tagsl)
str_list_del(&log_lv->tags, sl->str);
if (activation()) {
if (!wipe_lv(log_lv, (struct wipe_params)
{ .do_zero = 1, .zero_sectors = log_lv->size,
.zero_value = in_sync ? -1 : 0 })) {
log_error("Aborting. Failed to wipe mirror log.");
goto deactivate_and_revert_new_lv;
}
}
if (activation() && !_write_log_header(cmd, log_lv)) {
log_error("Aborting. Failed to write mirror log header.");
goto deactivate_and_revert_new_lv;
}
if (!deactivate_lv(cmd, log_lv)) {
log_error("Aborting. Failed to deactivate mirror log. "
"Manual intervention required.");
return 0;
}
lv_set_hidden(log_lv);
if (was_active && !activate_lv(cmd, log_lv))
return_0;
return 1;
deactivate_and_revert_new_lv:
if (!deactivate_lv(cmd, log_lv)) {
log_error("Unable to deactivate mirror log LV. "
"Manual intervention required.");
return 0;
}
revert_new_lv:
log_lv->status = orig_status;
dm_list_iterate_items(sl, tagsl)
str_list_del(&log_lv->tags, sl->str);
if (remove_on_failure && !lv_remove(log_lv)) {
log_error("Manual intervention may be required to remove "
"abandoned log LV before retrying.");
return 0;
}
if (!vg_write(log_lv->vg) || !vg_commit(log_lv->vg))
log_error("Manual intervention may be required to "
"remove/restore abandoned log LV before retrying.");
else
backup(log_lv->vg);
activate_lv:
if (was_active && !remove_on_failure && !activate_lv(cmd, log_lv))
return_0;
return 0;
}
/*
* Activate an LV similarly (i.e. SH or EX) to a given "model" LV
*/
static int _activate_lv_like_model(struct logical_volume *model,
struct logical_volume *lv)
{
if (lv_is_active_exclusive(model)) {
if (!activate_lv_excl(lv->vg->cmd, lv))
return_0;
} else {
if (!activate_lv(lv->vg->cmd, lv))
return_0;
}
return 1;
}
/*
* Delete independent/orphan LV, it must acquire lock.
*/
static int _delete_lv(struct logical_volume *mirror_lv, struct logical_volume *lv,
int reactivate)
{
struct cmd_context *cmd = mirror_lv->vg->cmd;
struct dm_str_list *sl;
/* Inherit tags - maybe needed for activation */
if (!str_list_match_list(&mirror_lv->tags, &lv->tags, NULL)) {
dm_list_iterate_items(sl, &mirror_lv->tags)
if (!str_list_add(cmd->mem, &lv->tags, sl->str)) {
log_error("Aborting. Unable to tag.");
return 0;
}
if (!vg_write(mirror_lv->vg) ||
!vg_commit(mirror_lv->vg)) {
log_error("Intermediate VG commit for orphan volume failed.");
return 0;
}
}
if (reactivate) {
/* FIXME: the 'model' should be 'mirror_lv' not 'lv', I think. */
if (!_activate_lv_like_model(lv, lv))
return_0;
/* FIXME Is this superfluous now? */
if (!sync_local_dev_names(cmd)) {
log_error("Failed to sync local devices when reactivating %s.",
display_lvname(lv));
return 0;
}
if (!deactivate_lv(cmd, lv))
return_0;
}
if (!lv_remove(lv))
return_0;
return 1;
}
static int _merge_mirror_images(struct logical_volume *lv,
const struct dm_list *mimages)
{
uint32_t addition = dm_list_size(mimages);
struct logical_volume **img_lvs;
struct lv_list *lvl;
int i = 0;
if (!addition)
return 1;
img_lvs = alloca(sizeof(*img_lvs) * addition);
dm_list_iterate_items(lvl, mimages)
img_lvs[i++] = lvl->lv;
return lv_add_mirror_lvs(lv, img_lvs, addition,
MIRROR_IMAGE, first_seg(lv)->region_size);
}
/* Unlink the relationship between the segment and its log_lv */
struct logical_volume *detach_mirror_log(struct lv_segment *mirrored_seg)
{
struct logical_volume *log_lv;
if (!mirrored_seg->log_lv)
return NULL;
log_lv = mirrored_seg->log_lv;
mirrored_seg->log_lv = NULL;
lv_set_visible(log_lv);
log_lv->status &= ~MIRROR_LOG;
if (!remove_seg_from_segs_using_this_lv(log_lv, mirrored_seg))
return_0;
return log_lv;
}
/* Check if mirror image LV is removable with regard to given removable_pvs */
int is_mirror_image_removable(struct logical_volume *mimage_lv, void *baton)
{
struct physical_volume *pv;
struct lv_segment *seg;
int pv_found;
struct pv_list *pvl;
uint32_t s;
struct dm_list *removable_pvs = baton;
if (!baton || dm_list_empty(removable_pvs))
return 1;
dm_list_iterate_items(seg, &mimage_lv->segments) {
for (s = 0; s < seg->area_count; s++) {
if (seg_type(seg, s) != AREA_PV) {
/* FIXME Recurse for AREA_LV? */
/* Structure of seg_lv is unknown.
* Not removing this LV for safety. */
return 0;
}
pv = seg_pv(seg, s);
pv_found = 0;
dm_list_iterate_items(pvl, removable_pvs) {
if (id_equal(&pv->id, &pvl->pv->id)) {
pv_found = 1;
break;
}
if (pvl->pv->dev && pv->dev &&
pv->dev->dev == pvl->pv->dev->dev) {
pv_found = 1;
break;
}
}
if (!pv_found)
return 0;
}
}
return 1;
}
/*
* _move_removable_mimages_to_end
*
* We always detach mimage LVs from the end of the areas array.
* This function will push 'count' mimages to the end of the array
* based on if their PVs are removable.
*
* This is an all or nothing function. Either the user specifies
* enough removable PVs to satisfy count, or they don't specify
* any removable_pvs at all (in which case all PVs in the mirror
* are considered removable).
*/
static int _move_removable_mimages_to_end(struct logical_volume *lv,
uint32_t count,
struct dm_list *removable_pvs)
{
int i;
struct logical_volume *sub_lv;
struct lv_segment *mirrored_seg = first_seg(lv);
if (!removable_pvs)
return 1;
for (i = mirrored_seg->area_count - 1; (i >= 0) && count; i--) {
sub_lv = seg_lv(mirrored_seg, i);
if (!is_temporary_mirror_layer(sub_lv) &&
is_mirror_image_removable(sub_lv, removable_pvs)) {
if (!shift_mirror_images(mirrored_seg, i))
return_0;
count--;
}
}
return !count;
}
static int _mirrored_lv_in_sync(struct logical_volume *lv)
{
dm_percent_t sync_percent;
if (!lv_mirror_percent(lv->vg->cmd, lv, 0, &sync_percent,
NULL)) {
if (lv_is_active_but_not_locally(lv))
log_error("Unable to determine mirror sync status of"
" remotely active LV, %s/%s",
lv->vg->name, lv->name);
else
log_error("Unable to determine mirror "
"sync status of %s/%s.",
lv->vg->name, lv->name);
return 0;
}
return (sync_percent == DM_PERCENT_100) ? 1 : 0;
}
/*
* Split off 'split_count' legs from a mirror
*
* Returns: 0 on error, 1 on success
*/
static int _split_mirror_images(struct logical_volume *lv,
const char *split_name,
uint32_t split_count,
struct dm_list *removable_pvs)
{
uint32_t i;
struct logical_volume *sub_lv = NULL;
struct logical_volume *new_lv = NULL;
struct logical_volume *detached_log_lv = NULL;
struct lv_segment *mirrored_seg = first_seg(lv);
struct dm_list split_images;
struct lv_list *lvl;
struct cmd_context *cmd = lv->vg->cmd;
if (!lv_is_mirrored(lv)) {
log_error("Unable to split non-mirrored LV %s.",
display_lvname(lv));
return 0;
}
if (!split_count) {
log_error(INTERNAL_ERROR "split_count is zero!");
return 0;
}
log_verbose("Detaching %d images from mirror %s.",
split_count, display_lvname(lv));
if (!_move_removable_mimages_to_end(lv, split_count, removable_pvs)) {
/*
* FIXME: Allow incomplete specification of removable PVs?
*
* I am forcing the user to either specify no
* removable PVs or all of them. Should we allow
* them to just specify some - making us pick the rest?
*/
log_error("Insufficient removable PVs given to satisfy request.");
return 0;
}
/*
* Step 1:
* Remove the images from the mirror.
* Make them visible, independent LVs (don't change names yet).
* Track them in a list for later instantiation.
*/
dm_list_init(&split_images);
for (i = 0; i < split_count; i++) {
mirrored_seg->area_count--;
sub_lv = seg_lv(mirrored_seg, mirrored_seg->area_count);
sub_lv->status &= ~MIRROR_IMAGE;
if (!release_lv_segment_area(mirrored_seg, mirrored_seg->area_count, mirrored_seg->area_len))
return_0;
log_very_verbose("LV %s assigned to be split.", display_lvname(sub_lv));
if (!new_lv) {
lv_set_visible(sub_lv);
new_lv = sub_lv;
continue;
}
/* If there is more than one image being split, add to list */
lvl = dm_pool_alloc(lv->vg->vgmem, sizeof(*lvl));
if (!lvl) {
log_error("lv_list alloc failed.");
return 0;
}
lvl->lv = sub_lv;
dm_list_add(&split_images, &lvl->list);
}
new_lv->name = dm_pool_strdup(lv->vg->vgmem, split_name);
if (!new_lv->name) {
log_error("Unable to rename newly split LV");
return 0;
}
if (!dm_list_empty(&split_images)) {
size_t len = strlen(new_lv->name) + 32;
char *layer_name, format[len];
/*
* A number of images have been split and
* a new mirror layer must be formed
*/
if (!insert_layer_for_lv(cmd, new_lv, 0, "_mimage_%d")) {
log_error("Failed to build new mirror, %s.",
display_lvname(new_lv));
return 0;
}
first_seg(new_lv)->region_size = mirrored_seg->region_size;
dm_list_iterate_items(lvl, &split_images) {
sub_lv = lvl->lv;
if (dm_snprintf(format, len, "%s_mimage_%%d",
new_lv->name) < 0) {
log_error("Failed to build new image name for %s.",
display_lvname(new_lv));
return 0;
}
if (!(layer_name = dm_pool_alloc(lv->vg->vgmem, len))) {
log_error("Unable to allocate memory.");
return 0;
}
if (!generate_lv_name(lv->vg, format, layer_name, len)||
sscanf(layer_name, format, &i) != 1) {
log_error("Failed to generate new image names for %s.",
display_lvname(new_lv));
return 0;
}
sub_lv->name = layer_name;
}
if (!_merge_mirror_images(new_lv, &split_images)) {
log_error("Failed to group split images into new mirror.");
return 0;
}
/*
* We don't allow splitting a mirror that is not in-sync,
* so we can bring the newly split mirror up without a
* resync. (It will be a 'core' log mirror after all.)
*/
init_mirror_in_sync(1);
}
sub_lv = NULL;
/*
* If no more mirrors, remove mirror layer.
* The sub_lv is removed entirely later - leaving
* only the top-level (now linear) LV.
*/
if (mirrored_seg->area_count == 1) {
sub_lv = seg_lv(mirrored_seg, 0);
sub_lv->status &= ~MIRROR_IMAGE;
lv_set_visible(sub_lv);
detached_log_lv = detach_mirror_log(mirrored_seg);
if (!remove_layer_from_lv(lv, sub_lv))
return_0;
lv->status &= ~(MIRROR | MIRRORED | LV_NOTSYNCED);
}
/*
* Suspend and resume the mirror - this includes all
* the sub-LVs and soon-to-be-split sub-LVs
*/
if (!lv_update_and_reload(mirrored_seg->lv))
return_0;
/*
* Recycle newly split LV so it is properly renamed.
* Cluster requires the extra deactivate/activate calls.
*/
if (vg_is_clustered(lv->vg) &&
(!deactivate_lv(cmd, new_lv) ||
!_activate_lv_like_model(lv, new_lv))) {
log_error("Failed to rename newly split LV in the kernel");
return 0;
}
if (!suspend_lv(cmd, new_lv) || !resume_lv(cmd, new_lv)) {
log_error("Failed to rename newly split LV in the kernel");
return 0;
}
/* Remove original mirror layer if it has been converted to linear */
if (sub_lv && !_delete_lv(lv, sub_lv, 1))
return_0;
/* Remove the log if it has been converted to linear */
if (detached_log_lv && !_delete_lv(lv, detached_log_lv, 1))
return_0;
return 1;
}
/*
* Remove num_removed images from mirrored_seg
*
* Arguments:
* num_removed: the requested (maximum) number of mirrors to be removed
* removable_pvs: if not NULL and list not empty, only mirrors using PVs
* in this list will be removed
* remove_log: if non-zero, log_lv will be removed
* (even if it's 0, log_lv will be removed if there is no
* mirror remaining after the removal)
* collapse: if non-zero, instead of removing, remove the temporary
* mirror layer and merge mirrors to the original LV.
* removable_pvs should be NULL and num_removed should be
* seg->area_count - 1.
* removed: if non NULL, the number of removed mirror images is set
* as a result
*
* If collapse is non-zero, <removed> is guaranteed to be equal to num_removed.
*
* Return values:
* Failure (0) means something unexpected has happend and
* the caller should abort.
* Even if no mirror was removed (e.g. no LV matches to 'removable_pvs'),
* returns success (1).
*/
static int _remove_mirror_images(struct logical_volume *lv,
uint32_t num_removed,
int (*is_removable)(struct logical_volume *, void *),
void *removable_baton,
unsigned remove_log, unsigned collapse,
uint32_t *removed, int preferred_only)
{
uint32_t m;
int32_t s;
struct logical_volume *sub_lv;
struct logical_volume *detached_log_lv = NULL;
struct logical_volume *temp_layer_lv = NULL;
struct lv_segment *seg, *pvmove_seg, *mirrored_seg = first_seg(lv);
uint32_t old_area_count = mirrored_seg->area_count;
uint32_t new_area_count = mirrored_seg->area_count;
struct lv_list *lvl;
struct dm_list tmp_orphan_lvs;
uint32_t orig_removed = num_removed;
int reactivate;
if (removed)
*removed = 0;
log_very_verbose("Reducing mirror set %s from " FMTu32 " to " FMTu32
" image(s)%s.", display_lvname(lv),
old_area_count, old_area_count - num_removed,
remove_log ? " and no log volume" : "");
if (collapse && (old_area_count - num_removed != 1)) {
log_error("Incompatible parameters to _remove_mirror_images.");
return 0;
}
num_removed = 0;
/* Move removable_pvs to end of array */
for (s = mirrored_seg->area_count - 1;
s >= 0 && old_area_count - new_area_count < orig_removed;
s--) {
sub_lv = seg_lv(mirrored_seg, s);
if (!(is_temporary_mirror_layer(sub_lv) && lv_mirror_count(sub_lv) != 1)) {
if (!is_removable) {
log_error(INTERNAL_ERROR "_remove_mirror_images called incorrectly with is_removable undefined.");
return 0;
}
if (!is_removable(sub_lv, removable_baton))
continue;
/*
* Check if the user is trying to pull the
* primary mirror image when the mirror is
* not in-sync.
*/
if ((s == 0) && !_mirrored_lv_in_sync(lv) &&
!(lv_is_partial(lv))) {
log_error("Unable to remove primary mirror image while mirror volume "
"%s is not in-sync.", display_lvname(lv));
return 0;
}
if (!shift_mirror_images(mirrored_seg, s))
return_0;
--new_area_count;
++num_removed;
}
}
if (!preferred_only)
num_removed = orig_removed;
/*
* If removable_pvs were specified, then they have been shifted
* to the end to ensure they are removed. The remaining balance
* of images left to remove will be taken from the unspecified.
*/
new_area_count = old_area_count - num_removed;
if (num_removed && old_area_count == new_area_count)
return 1;
/* Remove mimage LVs from the segment */
dm_list_init(&tmp_orphan_lvs);
for (m = new_area_count; m < mirrored_seg->area_count; m++) {
seg_lv(mirrored_seg, m)->status &= ~MIRROR_IMAGE;
lv_set_visible(seg_lv(mirrored_seg, m));
if (!(lvl = dm_pool_alloc(lv->vg->cmd->mem, sizeof(*lvl)))) {
log_error("lv_list alloc failed.");
return 0;
}
lvl->lv = seg_lv(mirrored_seg, m);
dm_list_add(&tmp_orphan_lvs, &lvl->list);
if (!release_lv_segment_area(mirrored_seg, m, mirrored_seg->area_len))
return_0;
}
mirrored_seg->area_count = new_area_count;
/* If no more mirrors, remove mirror layer */
/* As an exceptional case, if the lv is temporary layer,
* leave the LV as mirrored and let the lvconvert completion
* to remove the layer. */
if (new_area_count == 1 && !is_temporary_mirror_layer(lv)) {
temp_layer_lv = seg_lv(mirrored_seg, 0);
temp_layer_lv->status &= ~MIRROR_IMAGE;
lv_set_visible(temp_layer_lv);
detached_log_lv = detach_mirror_log(mirrored_seg);
if (!remove_layer_from_lv(lv, temp_layer_lv))
return_0;
if (collapse && !_merge_mirror_images(lv, &tmp_orphan_lvs)) {
log_error("Failed to add mirror images.");
return 0;
}
/*
* No longer a mirror? Even though new_area_count was 1,
* _merge_mirror_images may have resulted into lv being still a
* mirror. Fix up the flags if we only have one image left.
*/
if (lv_mirror_count(lv) == 1)
lv->status &= ~(MIRROR | MIRRORED | LV_NOTSYNCED);
mirrored_seg = first_seg(lv);
if (remove_log && !detached_log_lv)
detached_log_lv = detach_mirror_log(mirrored_seg);
if (lv_is_pvmove(lv))
dm_list_iterate_items(pvmove_seg, &lv->segments)
pvmove_seg->status |= PVMOVE;
} else if (new_area_count == 0) {
log_very_verbose("All mimages of %s are gone.", display_lvname(lv));
/* All mirror images are gone.
* It can happen for vgreduce --removemissing. */
detached_log_lv = detach_mirror_log(mirrored_seg);
lv->status &= ~(MIRROR | MIRRORED | LV_NOTSYNCED);
if (!replace_lv_with_error_segment(lv))
return_0;
} else if (remove_log)
detached_log_lv = detach_mirror_log(mirrored_seg);
/*
* The log may be removed due to repair. If the log
* happens to be a mirrored log, then there is a special
* case we need to consider. One of the images of a
* mirrored log can fail followed shortly afterwards by
* a failure of the second. This means that the top-level
* mirror is waiting for writes to the log to finish, but
* they never will unless the mirrored log can be repaired
* or replaced with an error target. Since both the devices
* have failed, we must replace with error target - it is
* the only way to release the pending writes.
*/
if (detached_log_lv && lv_is_mirrored(detached_log_lv) &&
lv_is_partial(detached_log_lv)) {
seg = first_seg(detached_log_lv);
log_very_verbose("%s being removed due to failures.",
display_lvname(detached_log_lv));
/*
* We are going to replace the mirror with an
* error segment, but before we do, we must remember
* all of the LVs that must be deleted later (i.e.
* the sub-lv's)
*/
for (m = 0; m < seg->area_count; m++) {
if (!(lvl = dm_pool_alloc(lv->vg->cmd->mem,
sizeof(*lvl))))
return_0;
seg_lv(seg, m)->status &= ~MIRROR_IMAGE;
lv_set_visible(seg_lv(seg, m));
lvl->lv = seg_lv(seg, m);
dm_list_add(&tmp_orphan_lvs, &lvl->list);
}
if (!replace_lv_with_error_segment(detached_log_lv)) {
log_error("Failed error target substitution for %s.",
display_lvname(detached_log_lv));
return 0;
}
if (!lv_update_and_reload(detached_log_lv))
return_0;
}
/*
* To successfully remove these unwanted LVs we need to
* remove the LVs from the mirror set, commit that metadata
* then deactivate and remove them fully.
*/
if (!vg_write(mirrored_seg->lv->vg)) {
log_error("intermediate VG write failed.");
return 0;
}
if (!suspend_lv_origin(mirrored_seg->lv->vg->cmd, mirrored_seg->lv)) {
log_error("Failed to lock %s.", display_lvname(mirrored_seg->lv));
vg_revert(mirrored_seg->lv->vg);
return 0;
}
/* FIXME: second suspend should not be needed
* Explicitly suspend temporary LV.
* This balances critical_section_inc() calls with critical_section_dec()
* in resume (both local and cluster) and also properly propagates precommitted
* metadata into dm table on other nodes.
* FIXME: check propagation of suspend with visible flag
*/
if (temp_layer_lv && !suspend_lv(temp_layer_lv->vg->cmd, temp_layer_lv))
log_error("Problem suspending temporary LV %s.", display_lvname(temp_layer_lv));
if (!vg_commit(mirrored_seg->lv->vg)) {
if (!resume_lv(mirrored_seg->lv->vg->cmd, mirrored_seg->lv))
stack;
return_0;
}
log_very_verbose("Updating %s in kernel.", display_lvname(mirrored_seg->lv));
/*
* Avoid having same mirror target loaded twice simultaneously by first
* resuming the removed LV which now contains an error segment.
* As it's now detached from mirrored_seg->lv we must resume it
* explicitly.
*/
if (temp_layer_lv && !resume_lv(temp_layer_lv->vg->cmd, temp_layer_lv)) {
log_error("Problem resuming temporary LV %s.", display_lvname(temp_layer_lv));
return 0;
}
if (!resume_lv_origin(mirrored_seg->lv->vg->cmd, mirrored_seg->lv)) {
log_error("Problem reactivating %s.", display_lvname(mirrored_seg->lv));
return 0;
}
/* Save or delete the 'orphan' LVs */
reactivate = lv_is_active(lv_lock_holder(lv));
if (!collapse) {
dm_list_iterate_items(lvl, &tmp_orphan_lvs)
if (!_delete_lv(lv, lvl->lv, reactivate))
return_0;
}
if (temp_layer_lv && !_delete_lv(lv, temp_layer_lv, reactivate))
return_0;
if (detached_log_lv && !_delete_lv(lv, detached_log_lv, reactivate))
return_0;
/* Mirror with only 1 area is 'in sync'. */
if (new_area_count == 1 && is_temporary_mirror_layer(lv)) {
if (first_seg(lv)->log_lv &&
!_init_mirror_log(lv->vg->cmd, first_seg(lv)->log_lv,
1, &lv->tags, 0)) {
/* As a result, unnecessary sync may run after
* collapsing. But safe.*/
log_error("Failed to initialize log device %s.",
display_lvname(first_seg(lv)->log_lv));
return 0;
}
}
if (removed)
*removed = old_area_count - new_area_count;
log_very_verbose(FMTu32 " image(s) removed from %s.",
old_area_count - new_area_count,
display_lvname(lv));
return 1;
}
/*
* Remove the number of mirror images from the LV
*/
int remove_mirror_images(struct logical_volume *lv, uint32_t num_mirrors,
int (*is_removable)(struct logical_volume *, void *),
void *removable_baton, unsigned remove_log)
{
uint32_t num_removed, removed_once, r;
uint32_t existing_mirrors = lv_mirror_count(lv);
struct logical_volume *next_lv = lv;
int preferred_only = 1;
int retries = 0;
num_removed = existing_mirrors - num_mirrors;
/* num_removed can be 0 if the function is called just to remove log */
do {
if (num_removed < first_seg(next_lv)->area_count)
removed_once = num_removed;
else
removed_once = first_seg(next_lv)->area_count - 1;
if (!_remove_mirror_images(next_lv, removed_once,
is_removable, removable_baton,
remove_log, 0, &r, preferred_only))
return_0;
if (r < removed_once || !removed_once) {
/* Some mirrors are removed from the temporary mirror,
* but the temporary layer still exists.
* Down the stack and retry for remainder. */
next_lv = find_temporary_mirror(next_lv);
if (!next_lv) {
preferred_only = 0;
next_lv = lv;
}
}
num_removed -= r;
/*
* if there are still images to be removed, try again; this is
* required since some temporary layers may have been reduced
* to 1, at which point they are made removable, just like
* normal images
*/
if (!next_lv && !preferred_only && !retries && num_removed) {
++retries;
preferred_only = 1;
}
} while (next_lv && num_removed);
if (num_removed) {
if (num_removed == existing_mirrors - num_mirrors)
log_error("No mirror images found using specified PVs.");
else {
log_error("%u images are removed out of requested %u.",
existing_mirrors - lv_mirror_count(lv),
existing_mirrors - num_mirrors);
}
return 0;
}
return 1;
}
static int _no_removable_images(struct logical_volume *lv __attribute__((unused)),
void *baton __attribute__((unused))) {
return 0;
}
/*
* Collapsing temporary mirror layers.
*
* When mirrors are added to already-mirrored LV, a temporary mirror layer
* is inserted at the top of the stack to reduce resync work.
* The function will remove the intermediate layer and collapse the stack
* as far as mirrors are in-sync.
*
* The function is destructive: to remove intermediate mirror layers,
* VG metadata commits and suspend/resume are necessary.
*/
int collapse_mirrored_lv(struct logical_volume *lv)
{
struct logical_volume *tmp_lv;
struct lv_segment *mirror_seg;
while ((tmp_lv = find_temporary_mirror(lv))) {
mirror_seg = find_mirror_seg(first_seg(tmp_lv));
if (!mirror_seg) {
log_error("Failed to find mirrored LV for %s",
tmp_lv->name);
return 0;
}
if (!_mirrored_lv_in_sync(mirror_seg->lv)) {
log_verbose("Not collapsing %s: out-of-sync",
mirror_seg->lv->name);
return 1;
}
if (!_remove_mirror_images(mirror_seg->lv,
mirror_seg->area_count - 1,
_no_removable_images, NULL, 0, 1, NULL, 0)) {
log_error("Failed to release mirror images");
return 0;
}
}
return 1;
}
#if 0
/* FIXME: reconfigure_mirror_images: remove this code? */
static int _get_mirror_fault_policy(struct cmd_context *cmd __attribute__((unused)),
int log_policy)
{
const char *policy = NULL;
/*
if (log_policy)
policy = find_config_tree_str(cmd, activation_mirror_log_fault_policy_CFG);
else {
policy = find_config_tree_str(cmd, activation_mirror_image_fault_policy_CFG);
if (!policy)
policy = find_config_tree_str(cmd, activation_mirror_device_fault_policy_CFG);
}
*/
if (!strcmp(policy, "remove"))
return MIRROR_REMOVE;
else if (!strcmp(policy, "allocate"))
return MIRROR_ALLOCATE;
else if (!strcmp(policy, "allocate_anywhere"))
return MIRROR_ALLOCATE_ANYWHERE;
if (log_policy)
log_error("Bad activation/mirror_log_fault_policy");
else
log_error("Bad activation/mirror_device_fault_policy");
return MIRROR_REMOVE;
}
static int _get_mirror_log_fault_policy(struct cmd_context *cmd)
{
return _get_mirror_fault_policy(cmd, 1);
}
static int _get_mirror_device_fault_policy(struct cmd_context *cmd)
{
return _get_mirror_fault_policy(cmd, 0);
}
/*
* replace_mirror_images
* @mirrored_seg: segment (which may be linear now) to restore
* @num_mirrors: number of copies we should end up with
* @replace_log: replace log if not present
* @in_sync: was the original mirror in-sync?
*
* in_sync will be set to 0 if new mirror devices are being added
* In other words, it is only useful if the log (and only the log)
* is being restored.
*
* Returns: 0 on failure, 1 on reconfig, -1 if no reconfig done
*/
static int _replace_mirror_images(struct lv_segment *mirrored_seg,
uint32_t num_mirrors,
int log_policy, int in_sync)
{
int r = -1;
struct logical_volume *lv = mirrored_seg->lv;
/* FIXME: Use lvconvert rather than duplicating its code */
if (mirrored_seg->area_count < num_mirrors) {
log_warn("WARNING: Failed to replace mirror device in %s.",
display_lvname(mirrored_seg->lv);
if ((mirrored_seg->area_count > 1) && !mirrored_seg->log_lv)
log_warn("WARNING: Use 'lvconvert -m %d %s --corelog' to replace failed devices.",
num_mirrors - 1, display_lvname(lv));
else
log_warn("WARNING: Use 'lvconvert -m %d %s' to replace failed devices.",
num_mirrors - 1, display_lvname(lv));
r = 0;
/* REMEMBER/FIXME: set in_sync to 0 if a new mirror device was added */
in_sync = 0;
}
/*
* FIXME: right now, we ignore the allocation policy specified to
* allocate the new log.
*/
if ((mirrored_seg->area_count > 1) && !mirrored_seg->log_lv &&
(log_policy != MIRROR_REMOVE)) {
log_warn("WARNING: Failed to replace mirror log device in %s.",
display_lvname(lv));
log_warn("WARNING: Use 'lvconvert -m %d %s' to replace failed devices.",
mirrored_seg->area_count - 1 , display_lvname(lv));
r = 0;
}
return r;
}
int reconfigure_mirror_images(struct lv_segment *mirrored_seg, uint32_t num_mirrors,
struct dm_list *removable_pvs, unsigned remove_log)
{
int r;
int in_sync;
int log_policy, dev_policy;
uint32_t old_num_mirrors = mirrored_seg->area_count;
int had_log = (mirrored_seg->log_lv) ? 1 : 0;
/* was the mirror in-sync before problems? */
in_sync = _mirrored_lv_in_sync(mirrored_seg->lv);
/*
* While we are only removing devices, we can have sync set.
* Setting this is only useful if we are moving to core log
* otherwise the disk log will contain the sync information
*/
init_mirror_in_sync(in_sync);
r = _remove_mirror_images(mirrored_seg->lv, old_num_mirrors - num_mirrors,
is_mirror_image_removable, removable_pvs,
remove_log, 0, NULL, 0);
if (!r)
/* Unable to remove bad devices */
return 0;
log_warn("WARNING: Bad device removed from mirror volume %s.",
display_lvname(mirrored_seg->lv));
log_policy = _get_mirror_log_fault_policy(mirrored_seg->lv->vg->cmd);
dev_policy = _get_mirror_device_fault_policy(mirrored_seg->lv->vg->cmd);
r = _replace_mirror_images(mirrored_seg,
(dev_policy != MIRROR_REMOVE) ?
old_num_mirrors : num_mirrors,
log_policy, in_sync);
if (!r)
/* Failed to replace device(s) */
log_warn("WARNING: Unable to find substitute device for mirror volume %s.",
display_lvname(mirrored_seg->lv));
else if (r > 0)
/* Success in replacing device(s) */
log_warn("WARNING: Mirror volume %s restored - substitute for failed device found.",
display_lvname(mirrored_seg->lv));
else
/* Bad device removed, but not replaced because of policy */
if (mirrored_seg->area_count == 1) {
log_warn("WARNING: Mirror volume %s converted to linear due to device failure.",
display_lvname(mirrored_seg->lv);
} else if (had_log && !mirrored_seg->log_lv) {
log_warn("WARNING: Mirror volume %s disk log removed due to device failure.",
display_lvname(mirrored_seg->lv));
}
/*
* If we made it here, we at least removed the bad device.
* Consider this success.
*/
return 1;
}
#endif
static int _create_mimage_lvs(struct alloc_handle *ah,
uint32_t num_mirrors,
uint32_t stripes,
uint32_t stripe_size,
struct logical_volume *lv,
struct logical_volume **img_lvs,
int log)
{
uint32_t m, first_area;
char *img_name;
size_t len;
len = strlen(lv->name) + 32;
img_name = alloca(len);
if (dm_snprintf(img_name, len, "%s_mimage_%%d", lv->name) < 0) {
log_error("img_name allocation failed. "
"Remove new LV and retry.");
return 0;
}
for (m = 0; m < num_mirrors; m++) {
if (!(img_lvs[m] = lv_create_empty(img_name,
NULL, LVM_READ | LVM_WRITE,
ALLOC_INHERIT, lv->vg))) {
log_error("Aborting. Failed to create mirror image LV. "
"Remove new LV and retry.");
return 0;
}
if (log) {
first_area = m * stripes + (log - 1);
if (!lv_add_log_segment(ah, first_area, img_lvs[m], 0)) {
log_error("Failed to add mirror image segment"
" to %s. Remove new LV and retry.",
img_lvs[m]->name);
return 0;
}
} else {
if (!lv_add_segment(ah, m * stripes, stripes, img_lvs[m],
get_segtype_from_string(lv->vg->cmd, SEG_TYPE_NAME_STRIPED),
stripe_size, 0, 0)) {
log_error("Aborting. Failed to add mirror image segment "
"to %s. Remove new LV and retry.",
img_lvs[m]->name);
return 0;
}
}
}
return 1;
}
/*
* Remove mirrors from each segment.
* 'new_mirrors' is the number of mirrors after the removal. '0' for linear.
* If 'status_mask' is non-zero, the removal happens only when all segments
* has the status bits on.
*/
int remove_mirrors_from_segments(struct logical_volume *lv,
uint32_t new_mirrors, uint64_t status_mask)
{
struct lv_segment *seg;
uint32_t s;
/* Check the segment params are compatible */
dm_list_iterate_items(seg, &lv->segments) {
if (!seg_is_mirrored(seg)) {
log_error("Segment is not mirrored: %s:%" PRIu32,
lv->name, seg->le);
return 0;
} if ((seg->status & status_mask) != status_mask) {
log_error("Segment status does not match: %s:%" PRIu32
" status:0x%" PRIx64 "/0x%" PRIx64, lv->name, seg->le,
seg->status, status_mask);
return 0;
}
}
/* Convert the segments */
dm_list_iterate_items(seg, &lv->segments) {
if (!new_mirrors && seg->extents_copied == seg->area_len) {
if (!move_lv_segment_area(seg, 0, seg, 1))
return_0;
}
for (s = new_mirrors + 1; s < seg->area_count; s++)
if (!release_and_discard_lv_segment_area(seg, s, seg->area_len))
return_0;
seg->area_count = new_mirrors + 1;
if (!new_mirrors)
seg->segtype = get_segtype_from_string(lv->vg->cmd, SEG_TYPE_NAME_STRIPED);
}
return 1;
}
const char *get_pvmove_pvname_from_lv_mirr(const struct logical_volume *lv_mirr)
{
struct lv_segment *seg;
dm_list_iterate_items(seg, &lv_mirr->segments) {
if (!seg_is_mirrored(seg))
continue;
if (seg_type(seg, 0) == AREA_PV)
return dev_name(seg_dev(seg, 0));
if (seg_type(seg, 0) == AREA_LV)
return dev_name(seg_dev(first_seg(seg_lv(seg, 0)), 0));
}
return NULL;
}
/*
* Find first pvmove LV referenced by a segment of an LV.
*/
const struct logical_volume *find_pvmove_lv_in_lv(const struct logical_volume *lv)
{
const struct lv_segment *seg;
uint32_t s;
dm_list_iterate_items(seg, &lv->segments) {
for (s = 0; s < seg->area_count; s++) {
if (seg_type(seg, s) != AREA_LV)
continue;
if (lv_is_pvmove(seg_lv(seg, s)))
return seg_lv(seg, s);
}
}
return NULL;
}
const char *get_pvmove_pvname_from_lv(const struct logical_volume *lv)
{
const struct logical_volume *pvmove_lv;
pvmove_lv = find_pvmove_lv_in_lv(lv);
if (pvmove_lv)
return get_pvmove_pvname_from_lv_mirr(pvmove_lv);
else
return NULL;
}
struct logical_volume *find_pvmove_lv(struct volume_group *vg,
struct device *dev,
uint64_t lv_type)
{
struct lv_list *lvl;
struct logical_volume *lv;
struct lv_segment *seg;
/* Loop through all LVs */
dm_list_iterate_items(lvl, &vg->lvs) {
lv = lvl->lv;
if (!(lv->status & lv_type))
continue;
/*
* If this is an atomic pvmove, the first
* segment will be a mirror containing
* mimages (i.e. AREA_LVs)
*/
if (seg_type(first_seg(lv), 0) == AREA_LV) {
seg = first_seg(lv); /* the mirror segment */
seg = first_seg(seg_lv(seg, 0)); /* mimage_0 segment0 */
if (seg_dev(seg, 0) != dev)
continue;
return lv;
}
/*
* If this is a normal pvmove, check all the segments'
* first areas for the requested device
*/
dm_list_iterate_items(seg, &lv->segments) {
if (seg_type(seg, 0) != AREA_PV)
continue;
if (seg_dev(seg, 0) != dev)
continue;
return lv;
}
}
return NULL;
}
struct dm_list *lvs_using_lv(struct cmd_context *cmd, struct volume_group *vg,
struct logical_volume *lv)
{
struct dm_list *lvs;
struct logical_volume *lv1;
struct lv_list *lvl, *lvl1;
struct lv_segment *seg;
uint32_t s;
if (!(lvs = dm_pool_alloc(cmd->mem, sizeof(*lvs)))) {
log_error("lvs list alloc failed");
return NULL;
}
dm_list_init(lvs);
/* Loop through all LVs except the one supplied */
dm_list_iterate_items(lvl1, &vg->lvs) {
lv1 = lvl1->lv;
if (lv1 == lv)
continue;
/* Find whether any segment points at the supplied LV */
dm_list_iterate_items(seg, &lv1->segments) {
for (s = 0; s < seg->area_count; s++) {
if (seg_type(seg, s) != AREA_LV ||
seg_lv(seg, s) != lv)
continue;
if (!(lvl = dm_pool_alloc(cmd->mem, sizeof(*lvl)))) {
log_error("lv_list alloc failed");
return NULL;
}
lvl->lv = lv1;
dm_list_add(lvs, &lvl->list);
goto next_lv;
}
}
next_lv:
;
}
return lvs;
}
/*
* Fixup mirror pointers after single-pass segment import
*/
int fixup_imported_mirrors(struct volume_group *vg)
{
struct lv_list *lvl;
struct lv_segment *seg;
dm_list_iterate_items(lvl, &vg->lvs) {
dm_list_iterate_items(seg, &lvl->lv->segments) {
if (seg->segtype !=
get_segtype_from_string(vg->cmd, SEG_TYPE_NAME_MIRROR))
continue;
if (seg->log_lv && !add_seg_to_segs_using_this_lv(seg->log_lv, seg))
return_0;
}
}
return 1;
}
static int _add_mirrors_that_preserve_segments(struct logical_volume *lv,
uint32_t flags,
uint32_t mirrors,
uint32_t region_size,
struct dm_list *allocatable_pvs,
alloc_policy_t alloc)
{
struct cmd_context *cmd = lv->vg->cmd;
struct alloc_handle *ah;
const struct segment_type *segtype;
struct dm_list *parallel_areas;
uint32_t adjusted_region_size;
int r = 1;
if (!(parallel_areas = build_parallel_areas_from_lv(lv, 1, 0)))
return_0;
if (!(segtype = get_segtype_from_string(cmd, SEG_TYPE_NAME_MIRROR)))
return_0;
adjusted_region_size = adjusted_mirror_region_size(lv->vg->extent_size,
lv->le_count,
region_size, 1,
vg_is_clustered(lv->vg));
if (!(ah = allocate_extents(lv->vg, NULL, segtype, 1, mirrors, 0, 0,
lv->le_count, allocatable_pvs, alloc, 0,
parallel_areas))) {
log_error("Unable to allocate mirror extents for %s.",
display_lvname(lv));
return 0;
}
if (flags & MIRROR_BY_SEG) {
if (!lv_add_mirror_areas(ah, lv, 0, adjusted_region_size)) {
log_error("Failed to add mirror areas to %s.",
display_lvname(lv));
r = 0;
}
} else if (flags & MIRROR_BY_SEGMENTED_LV) {
if (!lv_add_segmented_mirror_image(ah, lv, 0,
adjusted_region_size)) {
log_error("Failed to add mirror areas to %s.",
display_lvname(lv));
r = 0;
}
} else {
log_error(INTERNAL_ERROR "Unknown mirror flag.");
r = 0;
}
alloc_destroy(ah);
return r;
}
/*
* Add mirrors to "linear" or "mirror" segments
*/
int add_mirrors_to_segments(struct cmd_context *cmd, struct logical_volume *lv,
uint32_t mirrors, uint32_t region_size,
struct dm_list *allocatable_pvs, alloc_policy_t alloc)
{
return _add_mirrors_that_preserve_segments(lv, MIRROR_BY_SEG,
mirrors, region_size,
allocatable_pvs, alloc);
}
/*
* Convert mirror log
*
* FIXME: Can't handle segment-by-segment mirror (like pvmove)
*/
int remove_mirror_log(struct cmd_context *cmd,
struct logical_volume *lv,
struct dm_list *removable_pvs,
int force)
{
dm_percent_t sync_percent;
struct volume_group *vg = lv->vg;
/* Unimplemented features */
if (dm_list_size(&lv->segments) != 1) {
log_error("Multiple-segment mirror is not supported.");
return 0;
}
/* Had disk log, switch to core. */
if (lv_is_active_locally(lv)) {
if (!lv_mirror_percent(cmd, lv, 0, &sync_percent,
NULL)) {
log_error("Unable to determine mirror sync status.");
return 0;
}
} else if (lv_is_active(lv)) {
log_error("Unable to determine sync status of "
"remotely active mirror volume %s.", display_lvname(lv));
return 0;
} else if (vg_is_clustered(vg)) {
log_error("Unable to convert the log of an inactive "
"cluster mirror volume %s.", display_lvname(lv));
return 0;
} else if (force || yes_no_prompt("Full resync required to convert inactive "
"mirror volume %s to core log. "
"Proceed? [y/n]: ", display_lvname(lv)) == 'y')
sync_percent = 0;
else {
log_error("Logical volume %s NOT converted.", display_lvname(lv));
return 0;
}
if (sync_percent == DM_PERCENT_100)
init_mirror_in_sync(1);
else {
/* A full resync will take place */
lv->status &= ~LV_NOTSYNCED;
init_mirror_in_sync(0);
}
if (!remove_mirror_images(lv, lv_mirror_count(lv),
is_mirror_image_removable, removable_pvs, 1U))
return_0;
return 1;
}
static struct logical_volume *_create_mirror_log(struct logical_volume *lv,
struct alloc_handle *ah,
alloc_policy_t alloc,
const char *lv_name,
const char *suffix)
{
struct logical_volume *log_lv;
char *log_name;
size_t len;
len = strlen(lv_name) + 32;
log_name = alloca(len); /* alloca never fails */
if (dm_snprintf(log_name, len, "%s%s", lv_name, suffix) < 0) {
log_error("log_name allocation failed.");
return NULL;
}
if (!(log_lv = lv_create_empty(log_name, NULL,
VISIBLE_LV | LVM_READ | LVM_WRITE,
alloc, lv->vg)))
return_NULL;
if (!lv_add_log_segment(ah, 0, log_lv, MIRROR_LOG))
return_NULL;
return log_lv;
}
/*
* Returns: 1 on success, 0 on error
*/
static int _form_mirror(struct cmd_context *cmd, struct alloc_handle *ah,
struct logical_volume *lv,
uint32_t mirrors, uint32_t stripes,
uint32_t stripe_size, uint32_t region_size, int log)
{
struct logical_volume **img_lvs;
/*
* insert a mirror layer
*/
if (dm_list_size(&lv->segments) != 1 ||
seg_type(first_seg(lv), 0) != AREA_LV)
if (!insert_layer_for_lv(cmd, lv, 0, "_mimage_%d"))
return_0;
/*
* create mirror image LVs
*/
img_lvs = alloca(sizeof(*img_lvs) * mirrors);
if (!_create_mimage_lvs(ah, mirrors, stripes, stripe_size, lv, img_lvs, log))
return_0;
if (!lv_add_mirror_lvs(lv, img_lvs, mirrors,
/* Pass through MIRRORED & LOCKED status flag
* TODO: Any other would be needed ?? */
MIRROR_IMAGE | (lv->status & (MIRRORED | LOCKED)),
region_size)) {
log_error("Aborting. Failed to add mirror segment. "
"Remove new LV and retry.");
return 0;
}
return 1;
}
static struct logical_volume *_set_up_mirror_log(struct cmd_context *cmd,
struct alloc_handle *ah,
struct logical_volume *lv,
uint32_t log_count,
uint32_t region_size,
alloc_policy_t alloc,
int in_sync)
{
struct logical_volume *log_lv;
const char *suffix, *lv_name;
char *tmp_name;
size_t len;
struct lv_segment *seg;
init_mirror_in_sync(in_sync);
/* Mirror log name is lv_name + suffix, determined as the following:
* 1. suffix is:
* o "_mlog" for the original mirror LV.
* o "_mlogtmp_%d" for temporary mirror LV,
* 2. lv_name is:
* o lv->name, if the log is temporary
* o otherwise, the top-level LV name
*/
seg = first_seg(lv);
if (seg_type(seg, 0) == AREA_LV &&
strstr(seg_lv(seg, 0)->name, MIRROR_SYNC_LAYER)) {
lv_name = lv->name;
suffix = "_mlogtmp_%d";
} else if ((lv_name = strstr(lv->name, MIRROR_SYNC_LAYER))) {
len = lv_name - lv->name;
tmp_name = alloca(len + 1);
tmp_name[len] = '\0';
lv_name = strncpy(tmp_name, lv->name, len);
suffix = "_mlog";
} else {
lv_name = lv->name;
suffix = "_mlog";
}
if (!(log_lv = _create_mirror_log(lv, ah, alloc, lv_name, suffix))) {
log_error("Failed to create mirror log.");
return NULL;
}
if ((log_count > 1) &&
!_form_mirror(cmd, ah, log_lv, log_count-1, 1, 0, region_size, 2)) {
log_error("Failed to form mirrored log.");
return NULL;
}
if (!_init_mirror_log(cmd, log_lv, in_sync, &lv->tags, 1)) {
log_error("Failed to initialise mirror log.");
return NULL;
}
return log_lv;
}
int attach_mirror_log(struct lv_segment *seg, struct logical_volume *log_lv)
{
seg->log_lv = log_lv;
log_lv->status |= MIRROR_LOG;
lv_set_hidden(log_lv);
return add_seg_to_segs_using_this_lv(log_lv, seg);
}
int add_mirror_log(struct cmd_context *cmd, struct logical_volume *lv,
uint32_t log_count, uint32_t region_size,
struct dm_list *allocatable_pvs, alloc_policy_t alloc)
{
struct alloc_handle *ah;
const struct segment_type *segtype;
struct dm_list *parallel_areas;
dm_percent_t sync_percent;
int in_sync;
struct logical_volume *log_lv;
unsigned old_log_count;
int r = 0;
if (vg_is_clustered(lv->vg) && (log_count > 1)) {
log_error("Log type, \"mirrored\", is unavailable to cluster mirrors.");
return 0;
}
if (dm_list_size(&lv->segments) != 1) {
log_error("Multiple-segment mirror is not supported.");
return 0;
}
if (lv_is_active_but_not_locally(lv)) {
log_error("Unable to convert the log of a mirror, %s, that is "
"active remotely but not locally.", display_lvname(lv));
return 0;
}
log_lv = first_seg(lv)->log_lv;
old_log_count = (log_lv) ? lv_mirror_count(log_lv) : 0;
if (old_log_count == log_count) {
log_verbose("Mirror %s already has a %s log.", display_lvname(lv),
!log_count ? "core" :
(log_count == 1) ? "disk" : "mirrored");
return 1;
}
if (!(parallel_areas = build_parallel_areas_from_lv(lv, 0, 0)))
return_0;
if (!(segtype = get_segtype_from_string(cmd, SEG_TYPE_NAME_MIRROR)))
return_0;
if (activation() && segtype->ops->target_present &&
!segtype->ops->target_present(cmd, NULL, NULL)) {
log_error("%s: Required device-mapper target(s) not "
"detected in your kernel.", segtype->name);
return 0;
}
/* allocate destination extents */
if (!(ah = allocate_extents(lv->vg, NULL, segtype,
0, 0, log_count - old_log_count, region_size,
lv->le_count, allocatable_pvs,
alloc, 0, parallel_areas))) {
log_error("Unable to allocate extents for mirror log.");
return 0;
}
if (old_log_count) {
/* Converting from disk to mirrored log */
if (!_form_mirror(cmd, ah, log_lv, log_count - 1, 1, 0,
region_size, 1)) {
log_error("Failed to convert mirror log");
return 0;
}
r = 1;
goto out;
}
/* check sync status */
if (mirror_in_sync() ||
(lv_mirror_percent(cmd, lv, 0, &sync_percent, NULL) &&
(sync_percent == DM_PERCENT_100)))
in_sync = 1;
else
in_sync = 0;
if (!(log_lv = _set_up_mirror_log(cmd, ah, lv, log_count,
region_size, alloc, in_sync)))
goto_out;
if (!attach_mirror_log(first_seg(lv), log_lv))
goto_out;
r = 1;
out:
alloc_destroy(ah);
return r;
}
/*
* Convert "linear" LV to "mirror".
*/
int add_mirror_images(struct cmd_context *cmd, struct logical_volume *lv,
uint32_t mirrors, uint32_t stripes,
uint32_t stripe_size, uint32_t region_size,
struct dm_list *allocatable_pvs, alloc_policy_t alloc,
uint32_t log_count)
{
struct alloc_handle *ah;
const struct segment_type *segtype;
struct dm_list *parallel_areas;
struct logical_volume *log_lv = NULL;
/*
* allocate destination extents
*/
if (!(parallel_areas = build_parallel_areas_from_lv(lv, 0, 0)))
return_0;
if (!(segtype = get_segtype_from_string(cmd, SEG_TYPE_NAME_MIRROR)))
return_0;
if (!(ah = allocate_extents(lv->vg, NULL, segtype,
stripes, mirrors, log_count, region_size, lv->le_count,
allocatable_pvs, alloc, 0, parallel_areas))) {
log_error("Unable to allocate extents for mirror(s).");
return 0;
}
/*
* create and initialize mirror log
*/
if (log_count &&
!(log_lv = _set_up_mirror_log(cmd, ah, lv, log_count,
(region_size > lv->vg->extent_size) ?
lv->vg->extent_size : region_size,
alloc, mirror_in_sync()))) {
stack;
goto out_remove_images;
}
/* The log initialization involves vg metadata commit.
So from here on, if failure occurs, the log must be explicitly
removed and the updated vg metadata should be committed. */
if (!_form_mirror(cmd, ah, lv, mirrors, stripes, stripe_size, region_size, 0))
goto out_remove_log;
if (log_count && !attach_mirror_log(first_seg(lv), log_lv))
stack;
alloc_destroy(ah);
return 1;
out_remove_log:
if (log_lv) {
if (!lv_remove(log_lv) ||
!vg_write(log_lv->vg) ||
!vg_commit(log_lv->vg))
log_error("Manual intervention may be required to remove "
"abandoned log LV before retrying.");
else
backup(log_lv->vg);
}
out_remove_images:
alloc_destroy(ah);
return 0;
}
/*
* Generic interface for adding mirror and/or mirror log.
* 'mirror' is the number of mirrors to be added.
* 'pvs' is either allocatable pvs.
*/
int lv_add_mirrors(struct cmd_context *cmd, struct logical_volume *lv,
uint32_t mirrors, uint32_t stripes, uint32_t stripe_size,
uint32_t region_size, uint32_t log_count,
struct dm_list *pvs, alloc_policy_t alloc, uint32_t flags)
{
if (!mirrors && !log_count) {
log_error("No conversion is requested.");
return 0;
}
if (vg_is_clustered(lv->vg)) {
/* FIXME: move this test out of this function */
/* Skip test for pvmove mirrors, it can use local mirror */
if (!lv_is_pvmove(lv) && !lv_is_locked(lv) &&
lv_is_active(lv) &&
!lv_is_active_exclusive_locally(lv) && /* lv_is_active_remotely */
!cluster_mirror_is_available(lv->vg->cmd)) {
log_error("Shared cluster mirrors are not available.");
return 0;
}
/*
* No mirrored logs for cluster mirrors until
* log daemon is multi-threaded.
*/
if (log_count > 1) {
log_error("Log type, \"mirrored\", is unavailable to cluster mirrors.");
return 0;
}
}
/* For corelog mirror, activation code depends on
* the global mirror_in_sync status. As we are adding
* a new mirror, it should be set as 'out-of-sync'
* so that the sync starts. */
/* However, MIRROR_SKIP_INIT_SYNC even overrides it. */
if (flags & MIRROR_SKIP_INIT_SYNC)
init_mirror_in_sync(1);
else if (!log_count)
init_mirror_in_sync(0);
if (flags & MIRROR_BY_SEG) {
if (log_count) {
log_error("Persistent log is not supported on "
"segment-by-segment mirroring.");
return 0;
}
if (stripes > 1) {
log_error("Striped-mirroring is not supported on "
"segment-by-segment mirroring.");
return 0;
}
return _add_mirrors_that_preserve_segments(lv, MIRROR_BY_SEG,
mirrors, region_size,
pvs, alloc);
} else if (flags & MIRROR_BY_SEGMENTED_LV) {
if (stripes > 1) {
log_error("Striped-mirroring is not supported on "
"segment-by-segment mirroring.");
return 0;
}
return _add_mirrors_that_preserve_segments(lv, MIRROR_BY_SEGMENTED_LV,
mirrors, region_size,
pvs, alloc);
} else if (flags & MIRROR_BY_LV) {
if (!mirrors)
return add_mirror_log(cmd, lv, log_count,
region_size, pvs, alloc);
return add_mirror_images(cmd, lv, mirrors,
stripes, stripe_size, region_size,
pvs, alloc, log_count);
}
log_error("Unsupported mirror conversion type.");
return 0;
}
int lv_split_mirror_images(struct logical_volume *lv, const char *split_name,
uint32_t split_count, struct dm_list *removable_pvs)
{
int historical;
if (lv_name_is_used_in_vg(lv->vg, split_name, &historical)) {
log_error("%sLogical Volume \"%s\" already exists in "
"volume group \"%s\".", historical ? "historical " : "",
split_name, lv->vg->name);
return 0;
}
/* Can't split a mirror that is not in-sync... unless force? */
if (!_mirrored_lv_in_sync(lv)) {
log_error("Unable to split mirror %s that is not in-sync.",
display_lvname(lv));
return 0;
}
/*
* FIXME: Generate default name when not supplied.
*
* If we were going to generate a default name, we would
* do it here. Better to wait for a decision on the form
* of the default name when '--track_deltas' (the ability
* to merge a split leg back in and only copy the changes)
* is being implemented. For now, we force the user to
* come up with a name for their LV.
*/
if (!_split_mirror_images(lv, split_name, split_count, removable_pvs))
return_0;
return 1;
}
/*
* Generic interface for removing mirror and/or mirror log.
* 'mirror' is the number of mirrors to be removed.
* 'pvs' is removable pvs.
*/
int lv_remove_mirrors(struct cmd_context *cmd __attribute__((unused)),
struct logical_volume *lv,
uint32_t mirrors, uint32_t log_count,
int (*is_removable)(struct logical_volume *, void *),
void *removable_baton,
uint64_t status_mask)
{
uint32_t new_mirrors;
struct lv_segment *seg;
if (!mirrors && !log_count) {
log_error("No conversion is requested.");
return 0;
}
seg = first_seg(lv);
if (!seg_is_mirrored(seg)) {
log_error("Not a mirror segment.");
return 0;
}
if (lv_mirror_count(lv) <= mirrors) {
log_error("Removing more than existing: %d <= %d.",
seg->area_count, mirrors);
return 0;
}
new_mirrors = lv_mirror_count(lv) - mirrors - 1;
/* MIRROR_BY_LV */
if (seg_type(seg, 0) == AREA_LV &&
lv_is_mirror_image(seg_lv(seg, 0)))
return remove_mirror_images(lv, new_mirrors + 1,
is_removable, removable_baton,
log_count ? 1U : 0);
/* MIRROR_BY_SEG */
if (log_count) {
log_error("Persistent log is not supported on "
"segment-by-segment mirroring.");
return 0;
}
return remove_mirrors_from_segments(lv, new_mirrors, status_mask);
}
int set_mirror_log_count(int *log_count, const char *mirrorlog)
{
if (!strcmp("core", mirrorlog))
*log_count = MIRROR_LOG_CORE;
else if (!strcmp("disk", mirrorlog))
*log_count = MIRROR_LOG_DISK;
else if (!strcmp("mirrored", mirrorlog))
*log_count = MIRROR_LOG_MIRRORED;
else {
log_error("Mirror log type \"%s\" is unknown.", mirrorlog);
return 0;
}
return 1;
}
const char *get_mirror_log_name(int log_count)
{
switch (log_count) {
case MIRROR_LOG_CORE: return "core";
case MIRROR_LOG_DISK: return "disk";
case MIRROR_LOG_MIRRORED: return "mirrored";
default:
log_error(INTERNAL_ERROR "Unknown mirror log count %d.", log_count);
return NULL;
}
}
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