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lvm2/lib/metadata/thin_manip.c
Alasdair G Kergon 701b4a8363 thin: use discards as plural rather than singular
Global change from --discard to --discards, as that feels more natural.
2012-08-07 21:24:41 +01:00

463 lines
12 KiB
C

/*
* Copyright (C) 2011-2012 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lib.h"
#include "activate.h"
#include "locking.h"
#include "metadata.h"
#include "segtype.h"
#include "lv_alloc.h"
#include "archiver.h"
#include "defaults.h"
int attach_pool_metadata_lv(struct lv_segment *pool_seg, struct logical_volume *metadata_lv)
{
pool_seg->metadata_lv = metadata_lv;
metadata_lv->status |= THIN_POOL_METADATA;
lv_set_hidden(metadata_lv);
return add_seg_to_segs_using_this_lv(metadata_lv, pool_seg);
}
int attach_pool_data_lv(struct lv_segment *pool_seg, struct logical_volume *pool_data_lv)
{
if (!set_lv_segment_area_lv(pool_seg, 0, pool_data_lv, 0, THIN_POOL_DATA))
return_0;
lv_set_hidden(pool_data_lv);
return 1;
}
int attach_pool_lv(struct lv_segment *seg, struct logical_volume *pool_lv,
struct logical_volume *origin)
{
seg->pool_lv = pool_lv;
seg->lv->status |= THIN_VOLUME;
seg->origin = origin;
if (origin && !add_seg_to_segs_using_this_lv(origin, seg))
return_0;
return add_seg_to_segs_using_this_lv(pool_lv, seg);
}
int detach_pool_lv(struct lv_segment *seg)
{
struct lv_thin_message *tmsg, *tmp;
struct seg_list *sl, *tsl;
int no_update = 0;
if (!seg->pool_lv || !lv_is_thin_pool(seg->pool_lv)) {
log_error(INTERNAL_ERROR "LV %s is not a thin volume",
seg->lv->name);
return 0;
}
/* Drop any message referencing removed segment */
dm_list_iterate_items_safe(tmsg, tmp, &(first_seg(seg->pool_lv)->thin_messages)) {
switch (tmsg->type) {
case DM_THIN_MESSAGE_CREATE_SNAP:
case DM_THIN_MESSAGE_CREATE_THIN:
if (tmsg->u.lv == seg->lv) {
log_debug("Discarding message for LV %s.",
tmsg->u.lv->name);
dm_list_del(&tmsg->list);
no_update = 1; /* Replacing existing */
}
break;
case DM_THIN_MESSAGE_DELETE:
if (tmsg->u.delete_id == seg->device_id) {
log_error(INTERNAL_ERROR "Trying to delete %u again.",
tmsg->u.delete_id);
return 0;
}
break;
default:
log_error(INTERNAL_ERROR "Unsupported message type %u.", tmsg->type);
break;
}
}
if (!attach_pool_message(first_seg(seg->pool_lv),
DM_THIN_MESSAGE_DELETE,
NULL, seg->device_id, no_update))
return_0;
if (!remove_seg_from_segs_using_this_lv(seg->pool_lv, seg))
return_0;
if (seg->origin &&
!remove_seg_from_segs_using_this_lv(seg->origin, seg))
return_0;
/* If thin origin, remove it from related thin snapshots */
/*
* TODO: map removal of origin as snapshot lvconvert --merge?
* i.e. rename thin snapshot to origin thin origin
*/
dm_list_iterate_items_safe(sl, tsl, &seg->lv->segs_using_this_lv) {
if (!seg_is_thin_volume(sl->seg) ||
(seg->lv != sl->seg->origin))
continue;
if (!remove_seg_from_segs_using_this_lv(seg->lv, sl->seg))
return_0;
/* Thin snapshot is now regular thin volume */
sl->seg->origin = NULL;
}
return 1;
}
int attach_pool_message(struct lv_segment *pool_seg, dm_thin_message_t type,
struct logical_volume *lv, uint32_t delete_id,
int no_update)
{
struct lv_thin_message *tmsg;
if (!seg_is_thin_pool(pool_seg)) {
log_error(INTERNAL_ERROR "LV %s is not pool.", pool_seg->lv->name);
return 0;
}
if (pool_has_message(pool_seg, lv, delete_id)) {
if (lv)
log_error("Message referring LV %s already queued in pool %s.",
lv->name, pool_seg->lv->name);
else
log_error("Delete for device %u already queued in pool %s.",
delete_id, pool_seg->lv->name);
return 0;
}
if (!(tmsg = dm_pool_alloc(pool_seg->lv->vg->vgmem, sizeof(*tmsg)))) {
log_error("Failed to allocate memory for message.");
return 0;
}
switch (type) {
case DM_THIN_MESSAGE_CREATE_SNAP:
case DM_THIN_MESSAGE_CREATE_THIN:
tmsg->u.lv = lv;
break;
case DM_THIN_MESSAGE_DELETE:
tmsg->u.delete_id = delete_id;
break;
default:
log_error(INTERNAL_ERROR "Unsupported message type %u.", type);
return 0;
}
tmsg->type = type;
/* If the 1st message is add in non-read-only mode, modify transaction_id */
if (!no_update && dm_list_empty(&pool_seg->thin_messages))
pool_seg->transaction_id++;
dm_list_add(&pool_seg->thin_messages, &tmsg->list);
log_debug("Added %s message",
(type == DM_THIN_MESSAGE_CREATE_SNAP ||
type == DM_THIN_MESSAGE_CREATE_THIN) ? "create" :
(type == DM_THIN_MESSAGE_DELETE) ? "delete" : "unknown");
return 1;
}
/*
* Check whether pool has some message queued for LV or for device_id
* When LV is NULL and device_id is 0 it just checks for any message.
*/
int pool_has_message(const struct lv_segment *seg,
const struct logical_volume *lv, uint32_t device_id)
{
const struct lv_thin_message *tmsg;
if (!seg_is_thin_pool(seg)) {
log_error(INTERNAL_ERROR "LV %s is not pool.", seg->lv->name);
return 0;
}
if (!lv && !device_id)
return dm_list_empty(&seg->thin_messages);
dm_list_iterate_items(tmsg, &seg->thin_messages) {
switch (tmsg->type) {
case DM_THIN_MESSAGE_CREATE_SNAP:
case DM_THIN_MESSAGE_CREATE_THIN:
if (tmsg->u.lv == lv)
return 1;
break;
case DM_THIN_MESSAGE_DELETE:
if (tmsg->u.delete_id == device_id)
return 1;
break;
default:
break;
}
}
return 0;
}
int pool_below_threshold(const struct lv_segment *pool_seg)
{
percent_t percent;
int threshold = PERCENT_1 *
find_config_tree_int(pool_seg->lv->vg->cmd,
"activation/thin_pool_autoextend_threshold",
DEFAULT_THIN_POOL_AUTOEXTEND_THRESHOLD);
/* Data */
if (!lv_thin_pool_percent(pool_seg->lv, 0, &percent))
return_0;
if (percent >= threshold)
return_0;
/* Metadata */
if (!lv_thin_pool_percent(pool_seg->lv, 1, &percent))
return_0;
if (percent >= threshold)
return_0;
return 1;
}
struct lv_segment *find_pool_seg(const struct lv_segment *seg)
{
struct lv_segment *pool_seg;
pool_seg = get_only_segment_using_this_lv(seg->lv);
if (!pool_seg) {
log_error("Failed to find pool_seg for %s", seg->lv->name);
return NULL;
}
if (!seg_is_thin_pool(pool_seg)) {
log_error("%s on %s is not a pool segment",
pool_seg->lv->name, seg->lv->name);
return NULL;
}
return pool_seg;
}
/*
* Find a free device_id for given thin_pool segment.
*
* \return
* Free device id, or 0 if free device_id is not found.
*
* FIXME: Improve naive search and keep the value cached
* and updated during VG lifetime (so no const for lv_segment)
*/
uint32_t get_free_pool_device_id(struct lv_segment *thin_pool_seg)
{
uint32_t max_id = 0;
struct seg_list *sl;
if (!seg_is_thin_pool(thin_pool_seg)) {
log_error(INTERNAL_ERROR
"Segment in %s is not a thin pool segment.",
thin_pool_seg->lv->name);
return 0;
}
dm_list_iterate_items(sl, &thin_pool_seg->lv->segs_using_this_lv)
if (sl->seg->device_id > max_id)
max_id = sl->seg->device_id;
if (++max_id > DM_THIN_MAX_DEVICE_ID) {
/* FIXME Find empty holes instead of aborting! */
log_error("Cannot find free device_id.");
return 0;
}
log_debug("Found free pool device_id %u.", max_id);
return max_id;
}
// FIXME Rename this fn: it doesn't extend an already-existing pool AFAICT
int extend_pool(struct logical_volume *pool_lv, const struct segment_type *segtype,
struct alloc_handle *ah, uint32_t stripes, uint32_t stripe_size)
{
const struct segment_type *striped;
struct logical_volume *meta_lv, *data_lv;
struct lv_segment *seg;
const size_t len = strlen(pool_lv->name) + 16;
char name[len];
if (pool_lv->le_count) {
/* FIXME move code for manipulation from lv_manip.c */
log_error(INTERNAL_ERROR "Pool %s has already extents.", pool_lv->name);
return 0;
}
/* LV is not yet a pool, so it's extension from lvcreate */
if (!(striped = get_segtype_from_string(pool_lv->vg->cmd, "striped")))
return_0;
if (activation() && segtype->ops->target_present &&
!segtype->ops->target_present(pool_lv->vg->cmd, NULL, NULL)) {
log_error("%s: Required device-mapper target(s) not "
"detected in your kernel.", segtype->name);
return 0;
}
/* Metadata segment */
if (!lv_add_segment(ah, stripes, 1, pool_lv, striped, 1, 0, 0))
return_0;
if (activation()) {
if (!vg_write(pool_lv->vg) || !vg_commit(pool_lv->vg))
return_0;
/*
* If killed here, only the VISIBLE striped pool LV is left
* and user could easily remove it.
*
* FIXME: implement lazy clearing when activation is disabled
*/
/* pool_lv is a new LV so the VG lock protects us */
if (!activate_lv_local(pool_lv->vg->cmd, pool_lv) ||
/* Clear 4KB of metadata device for new thin-pool. */
!set_lv(pool_lv->vg->cmd, pool_lv, UINT64_C(0), 0)) {
log_error("Aborting. Failed to wipe pool metadata %s.",
pool_lv->name);
return 0;
}
if (!deactivate_lv_local(pool_lv->vg->cmd, pool_lv)) {
log_error("Aborting. Could not deactivate pool metadata %s.",
pool_lv->name);
return 0;
}
} else {
log_warn("WARNING: Pool %s is created without initilization.", pool_lv->name);
}
if (dm_snprintf(name, len, "%s_tmeta", pool_lv->name) < 0)
return_0;
if (!(meta_lv = lv_create_empty(name, NULL, LVM_READ | LVM_WRITE,
ALLOC_INHERIT, pool_lv->vg)))
return_0;
if (!move_lv_segments(meta_lv, pool_lv, 0, 0))
return_0;
/* Pool data segment */
if (!lv_add_segment(ah, 0, stripes, pool_lv, striped, stripe_size, 0, 0))
return_0;
if (!(data_lv = insert_layer_for_lv(pool_lv->vg->cmd, pool_lv,
pool_lv->status, "_tdata")))
return_0;
seg = first_seg(pool_lv);
seg->segtype = segtype; /* Set as thin_pool segment */
seg->lv->status |= THIN_POOL;
if (!attach_pool_metadata_lv(seg, meta_lv))
return_0;
/* Drop reference as attach_pool_data_lv() takes it again */
remove_seg_from_segs_using_this_lv(data_lv, seg);
if (!attach_pool_data_lv(seg, data_lv))
return_0;
return 1;
}
int update_pool_lv(struct logical_volume *lv, int activate)
{
int monitored;
if (!lv_is_thin_pool(lv)) {
log_error(INTERNAL_ERROR "Updated LV %s is not pool.", lv->name);
return 0;
}
if (dm_list_empty(&(first_seg(lv)->thin_messages)))
return 1; /* No messages */
if (activate) {
/* If the pool is not active, do activate deactivate */
if (!lv_is_active(lv)) {
monitored = dmeventd_monitor_mode();
init_dmeventd_monitor(DMEVENTD_MONITOR_IGNORE);
if (!activate_lv_excl(lv->vg->cmd, lv))
return_0;
if (!deactivate_lv(lv->vg->cmd, lv))
return_0;
init_dmeventd_monitor(monitored);
}
/*
* Resume active pool to send thin messages.
* origin_only is used to skip check for resumed state
*/
else if (!resume_lv_origin(lv->vg->cmd, lv)) {
log_error("Failed to resume %s.", lv->name);
return 0;
}
}
dm_list_init(&(first_seg(lv)->thin_messages));
if (!vg_write(lv->vg) || !vg_commit(lv->vg))
return_0;
backup(lv->vg);
return 1;
}
int get_pool_discards(const char *str, thin_discards_t *discards)
{
if (!strcasecmp(str, "passdown"))
*discards = THIN_DISCARDS_PASSDOWN;
else if (!strcasecmp(str, "nopassdown"))
*discards = THIN_DISCARDS_NO_PASSDOWN;
else if (!strcasecmp(str, "ignore"))
*discards = THIN_DISCARDS_IGNORE;
else {
log_error("Thin pool discards type %s is unknown.", str);
return 0;
}
return 1;
}
const char *get_pool_discards_name(thin_discards_t discards)
{
switch (discards) {
case THIN_DISCARDS_PASSDOWN:
return "passdown";
case THIN_DISCARDS_NO_PASSDOWN:
return "nopassdown";
case THIN_DISCARDS_IGNORE:
return "ignore";
}
log_error(INTERNAL_ERROR "Uknown discards type encountered.");
return "unknown";
}