mirror of
git://sourceware.org/git/lvm2.git
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8de912b677
Check we do not combine multiple messages for same LV target and switch to use 'delete_id' to make it clear for what this device_id is being used.
219 lines
5.3 KiB
C
219 lines
5.3 KiB
C
/*
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* Copyright (C) 2011 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "lib.h"
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#include "metadata.h"
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#include "segtype.h"
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#include "lv_alloc.h"
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int attach_pool_metadata_lv(struct lv_segment *seg, struct logical_volume *pool_metadata_lv)
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{
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seg->pool_metadata_lv = pool_metadata_lv;
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pool_metadata_lv->status |= THIN_POOL_METADATA;
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lv_set_hidden(pool_metadata_lv);
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return add_seg_to_segs_using_this_lv(pool_metadata_lv, seg);
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}
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int attach_pool_data_lv(struct lv_segment *seg, struct logical_volume *pool_data_lv)
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{
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if (!set_lv_segment_area_lv(seg, 0, pool_data_lv, 0, THIN_POOL_DATA))
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return_0;
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lv_set_hidden(pool_data_lv);
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return 1;
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}
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int attach_pool_lv(struct lv_segment *seg, struct logical_volume *pool_lv)
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{
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seg->pool_lv = pool_lv;
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seg->lv->status |= THIN_VOLUME;
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return add_seg_to_segs_using_this_lv(pool_lv, seg);
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}
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int detach_pool_lv(struct lv_segment *seg)
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{
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struct lv_thin_message *tmsg;
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struct dm_list *l, *lt;
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if (!lv_is_thin_pool(seg->pool_lv)) {
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log_error(INTERNAL_ERROR "LV %s is not a thin pool",
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seg->pool_lv->name);
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return 0;
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}
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/* Drop any message referencing removed segment */
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dm_list_iterate_safe(l, lt, &first_seg(seg->pool_lv)->thin_messages) {
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tmsg = dm_list_item(l, struct lv_thin_message);
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switch (tmsg->type) {
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case DM_THIN_MESSAGE_CREATE_SNAP:
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case DM_THIN_MESSAGE_CREATE_THIN:
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case DM_THIN_MESSAGE_TRIM:
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if (first_seg(tmsg->u.lv) == seg) {
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log_debug("Discarding message for LV %s.",
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tmsg->u.lv->name);
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dm_list_del(&tmsg->list);
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}
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default:
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break;
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}
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}
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if (!attach_pool_message(first_seg(seg->pool_lv),
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DM_THIN_MESSAGE_DELETE,
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NULL, seg->device_id, 0))
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return_0;
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return remove_seg_from_segs_using_this_lv(seg->pool_lv, seg);
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}
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int attach_pool_message(struct lv_segment *seg, dm_thin_message_t type,
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struct logical_volume *lv, uint32_t delete_id,
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int read_only)
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{
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struct lv_thin_message *tmsg;
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dm_list_iterate_items(tmsg, &seg->thin_messages) {
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if (tmsg->type == type) {
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switch (tmsg->type) {
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case DM_THIN_MESSAGE_CREATE_SNAP:
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case DM_THIN_MESSAGE_CREATE_THIN:
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case DM_THIN_MESSAGE_TRIM:
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if (tmsg->u.lv == lv) {
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log_error("Message referring LV %s already queued for %s.",
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tmsg->u.lv->name, seg->lv->name);
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return 0;
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}
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break;
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case DM_THIN_MESSAGE_DELETE:
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if (tmsg->u.delete_id == delete_id) {
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log_error("Delete of device %u already queued for %s.",
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tmsg->u.delete_id, seg->lv->name);
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return 0;
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}
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break;
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default:
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break;
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}
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}
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}
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if (!(tmsg = dm_pool_alloc(seg->lv->vg->vgmem, sizeof(*tmsg)))) {
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log_error("Failed to allocate memory for message.");
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return 0;
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}
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switch (type) {
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case DM_THIN_MESSAGE_CREATE_SNAP:
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case DM_THIN_MESSAGE_CREATE_THIN:
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case DM_THIN_MESSAGE_TRIM:
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tmsg->u.lv = lv;
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break;
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case DM_THIN_MESSAGE_DELETE:
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tmsg->u.delete_id = delete_id;
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break;
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default:
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log_error(INTERNAL_ERROR "Unsupported message type %d", type);
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return 0;
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}
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tmsg->type = type;
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/* If the 1st message is add in non-read-only mode, modify transaction_id */
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if (!read_only && dm_list_empty(&seg->thin_messages))
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seg->transaction_id++;
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dm_list_add(&seg->thin_messages, &tmsg->list);
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log_debug("Added %s message",
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(type == DM_THIN_MESSAGE_CREATE_SNAP ||
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type == DM_THIN_MESSAGE_CREATE_THIN) ? "create" :
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(type == DM_THIN_MESSAGE_TRIM) ? "trim" :
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(type == DM_THIN_MESSAGE_DELETE) ? "delete" : "unknown");
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return 1;
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}
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int detach_pool_messages(struct lv_segment *seg)
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{
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if (!lv_is_thin_pool(seg->lv)) {
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log_error(INTERNAL_ERROR "LV %s is not a thin pool.",
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seg->lv->name);
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return 0;
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}
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dm_list_init(&seg->thin_messages);
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return 1;
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}
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struct lv_segment *find_pool_seg(const struct lv_segment *seg)
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{
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struct lv_segment *pool_seg;
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pool_seg = get_only_segment_using_this_lv(seg->lv);
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if (!pool_seg) {
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log_error("Failed to find pool_seg for %s", seg->lv->name);
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return NULL;
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}
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if (!seg_is_thin_pool(pool_seg)) {
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log_error("%s on %s is not a pool segment",
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pool_seg->lv->name, seg->lv->name);
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return NULL;
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}
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return pool_seg;
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}
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/*
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* Find a free device_id for given thin_pool segment.
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*
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* \return
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* Free device id, or 0 if free device_id is not found.
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*
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* FIXME: Improve naive search and keep the value cached
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* and updated during VG lifetime (so no const for lv_segment)
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*/
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uint32_t get_free_pool_device_id(struct lv_segment *thin_pool_seg)
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{
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uint32_t dev_id, max_id = 0;
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struct dm_list *h;
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if (!seg_is_thin_pool(thin_pool_seg)) {
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log_error("Segment in %s is not a thin pool segment.",
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thin_pool_seg->lv->name);
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return 0;
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}
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dm_list_iterate(h, &thin_pool_seg->lv->segs_using_this_lv) {
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dev_id = dm_list_item(h, struct seg_list)->seg->device_id;
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if (dev_id > max_id)
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max_id = dev_id;
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}
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if (++max_id >= (1 << 24)) {
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// FIXME: try to find empty holes....
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log_error("Free device_id exhausted...");
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return 0;
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}
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log_debug("Found free pool device_id %u.", max_id);
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return max_id;
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}
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