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![Markus Elfring](/assets/img/avatar_default.png)
The local variable "rv" is reassigned by a statement at the beginning. Thus omit the explicit initialisation. Signed-off-by: Markus Elfring <elfring@users.sourceforge.net> Signed-off-by: David Teigland <teigland@redhat.com>
719 lines
16 KiB
C
719 lines
16 KiB
C
/******************************************************************************
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*******************************************************************************
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**
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** Copyright (C) 2005-2011 Red Hat, Inc. All rights reserved.
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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 General Public License v.2.
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**
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*******************************************************************************
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******************************************************************************/
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#include "dlm_internal.h"
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#include "lockspace.h"
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#include "member.h"
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#include "recoverd.h"
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#include "recover.h"
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#include "rcom.h"
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#include "config.h"
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#include "lowcomms.h"
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int dlm_slots_version(struct dlm_header *h)
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{
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if ((h->h_version & 0x0000FFFF) < DLM_HEADER_SLOTS)
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return 0;
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return 1;
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}
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void dlm_slot_save(struct dlm_ls *ls, struct dlm_rcom *rc,
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struct dlm_member *memb)
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{
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struct rcom_config *rf = (struct rcom_config *)rc->rc_buf;
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if (!dlm_slots_version(&rc->rc_header))
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return;
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memb->slot = le16_to_cpu(rf->rf_our_slot);
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memb->generation = le32_to_cpu(rf->rf_generation);
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}
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void dlm_slots_copy_out(struct dlm_ls *ls, struct dlm_rcom *rc)
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{
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struct dlm_slot *slot;
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struct rcom_slot *ro;
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int i;
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ro = (struct rcom_slot *)(rc->rc_buf + sizeof(struct rcom_config));
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/* ls_slots array is sparse, but not rcom_slots */
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for (i = 0; i < ls->ls_slots_size; i++) {
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slot = &ls->ls_slots[i];
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if (!slot->nodeid)
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continue;
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ro->ro_nodeid = cpu_to_le32(slot->nodeid);
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ro->ro_slot = cpu_to_le16(slot->slot);
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ro++;
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}
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}
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#define SLOT_DEBUG_LINE 128
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static void log_slots(struct dlm_ls *ls, uint32_t gen, int num_slots,
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struct rcom_slot *ro0, struct dlm_slot *array,
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int array_size)
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{
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char line[SLOT_DEBUG_LINE];
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int len = SLOT_DEBUG_LINE - 1;
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int pos = 0;
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int ret, i;
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memset(line, 0, sizeof(line));
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if (array) {
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for (i = 0; i < array_size; i++) {
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if (!array[i].nodeid)
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continue;
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ret = snprintf(line + pos, len - pos, " %d:%d",
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array[i].slot, array[i].nodeid);
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if (ret >= len - pos)
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break;
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pos += ret;
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}
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} else if (ro0) {
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for (i = 0; i < num_slots; i++) {
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ret = snprintf(line + pos, len - pos, " %d:%d",
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ro0[i].ro_slot, ro0[i].ro_nodeid);
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if (ret >= len - pos)
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break;
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pos += ret;
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}
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}
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log_rinfo(ls, "generation %u slots %d%s", gen, num_slots, line);
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}
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int dlm_slots_copy_in(struct dlm_ls *ls)
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{
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struct dlm_member *memb;
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struct dlm_rcom *rc = ls->ls_recover_buf;
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struct rcom_config *rf = (struct rcom_config *)rc->rc_buf;
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struct rcom_slot *ro0, *ro;
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int our_nodeid = dlm_our_nodeid();
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int i, num_slots;
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uint32_t gen;
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if (!dlm_slots_version(&rc->rc_header))
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return -1;
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gen = le32_to_cpu(rf->rf_generation);
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if (gen <= ls->ls_generation) {
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log_error(ls, "dlm_slots_copy_in gen %u old %u",
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gen, ls->ls_generation);
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}
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ls->ls_generation = gen;
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num_slots = le16_to_cpu(rf->rf_num_slots);
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if (!num_slots)
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return -1;
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ro0 = (struct rcom_slot *)(rc->rc_buf + sizeof(struct rcom_config));
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for (i = 0, ro = ro0; i < num_slots; i++, ro++) {
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ro->ro_nodeid = le32_to_cpu(ro->ro_nodeid);
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ro->ro_slot = le16_to_cpu(ro->ro_slot);
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}
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log_slots(ls, gen, num_slots, ro0, NULL, 0);
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list_for_each_entry(memb, &ls->ls_nodes, list) {
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for (i = 0, ro = ro0; i < num_slots; i++, ro++) {
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if (ro->ro_nodeid != memb->nodeid)
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continue;
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memb->slot = ro->ro_slot;
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memb->slot_prev = memb->slot;
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break;
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}
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if (memb->nodeid == our_nodeid) {
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if (ls->ls_slot && ls->ls_slot != memb->slot) {
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log_error(ls, "dlm_slots_copy_in our slot "
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"changed %d %d", ls->ls_slot,
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memb->slot);
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return -1;
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}
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if (!ls->ls_slot)
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ls->ls_slot = memb->slot;
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}
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if (!memb->slot) {
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log_error(ls, "dlm_slots_copy_in nodeid %d no slot",
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memb->nodeid);
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return -1;
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}
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}
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return 0;
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}
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/* for any nodes that do not support slots, we will not have set memb->slot
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in wait_status_all(), so memb->slot will remain -1, and we will not
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assign slots or set ls_num_slots here */
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int dlm_slots_assign(struct dlm_ls *ls, int *num_slots, int *slots_size,
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struct dlm_slot **slots_out, uint32_t *gen_out)
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{
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struct dlm_member *memb;
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struct dlm_slot *array;
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int our_nodeid = dlm_our_nodeid();
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int array_size, max_slots, i;
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int need = 0;
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int max = 0;
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int num = 0;
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uint32_t gen = 0;
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/* our own memb struct will have slot -1 gen 0 */
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list_for_each_entry(memb, &ls->ls_nodes, list) {
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if (memb->nodeid == our_nodeid) {
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memb->slot = ls->ls_slot;
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memb->generation = ls->ls_generation;
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break;
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}
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}
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list_for_each_entry(memb, &ls->ls_nodes, list) {
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if (memb->generation > gen)
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gen = memb->generation;
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/* node doesn't support slots */
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if (memb->slot == -1)
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return -1;
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/* node needs a slot assigned */
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if (!memb->slot)
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need++;
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/* node has a slot assigned */
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num++;
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if (!max || max < memb->slot)
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max = memb->slot;
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/* sanity check, once slot is assigned it shouldn't change */
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if (memb->slot_prev && memb->slot && memb->slot_prev != memb->slot) {
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log_error(ls, "nodeid %d slot changed %d %d",
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memb->nodeid, memb->slot_prev, memb->slot);
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return -1;
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}
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memb->slot_prev = memb->slot;
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}
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array_size = max + need;
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array = kcalloc(array_size, sizeof(*array), GFP_NOFS);
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if (!array)
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return -ENOMEM;
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num = 0;
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/* fill in slots (offsets) that are used */
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list_for_each_entry(memb, &ls->ls_nodes, list) {
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if (!memb->slot)
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continue;
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if (memb->slot > array_size) {
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log_error(ls, "invalid slot number %d", memb->slot);
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kfree(array);
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return -1;
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}
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array[memb->slot - 1].nodeid = memb->nodeid;
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array[memb->slot - 1].slot = memb->slot;
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num++;
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}
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/* assign new slots from unused offsets */
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list_for_each_entry(memb, &ls->ls_nodes, list) {
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if (memb->slot)
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continue;
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for (i = 0; i < array_size; i++) {
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if (array[i].nodeid)
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continue;
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memb->slot = i + 1;
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memb->slot_prev = memb->slot;
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array[i].nodeid = memb->nodeid;
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array[i].slot = memb->slot;
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num++;
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if (!ls->ls_slot && memb->nodeid == our_nodeid)
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ls->ls_slot = memb->slot;
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break;
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}
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if (!memb->slot) {
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log_error(ls, "no free slot found");
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kfree(array);
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return -1;
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}
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}
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gen++;
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log_slots(ls, gen, num, NULL, array, array_size);
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max_slots = (dlm_config.ci_buffer_size - sizeof(struct dlm_rcom) -
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sizeof(struct rcom_config)) / sizeof(struct rcom_slot);
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if (num > max_slots) {
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log_error(ls, "num_slots %d exceeds max_slots %d",
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num, max_slots);
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kfree(array);
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return -1;
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}
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*gen_out = gen;
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*slots_out = array;
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*slots_size = array_size;
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*num_slots = num;
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return 0;
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}
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static void add_ordered_member(struct dlm_ls *ls, struct dlm_member *new)
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{
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struct dlm_member *memb = NULL;
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struct list_head *tmp;
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struct list_head *newlist = &new->list;
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struct list_head *head = &ls->ls_nodes;
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list_for_each(tmp, head) {
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memb = list_entry(tmp, struct dlm_member, list);
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if (new->nodeid < memb->nodeid)
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break;
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}
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if (!memb)
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list_add_tail(newlist, head);
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else {
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/* FIXME: can use list macro here */
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newlist->prev = tmp->prev;
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newlist->next = tmp;
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tmp->prev->next = newlist;
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tmp->prev = newlist;
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}
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}
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static int dlm_add_member(struct dlm_ls *ls, struct dlm_config_node *node)
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{
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struct dlm_member *memb;
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int error;
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memb = kzalloc(sizeof(*memb), GFP_NOFS);
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if (!memb)
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return -ENOMEM;
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error = dlm_lowcomms_connect_node(node->nodeid);
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if (error < 0) {
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kfree(memb);
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return error;
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}
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memb->nodeid = node->nodeid;
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memb->weight = node->weight;
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memb->comm_seq = node->comm_seq;
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add_ordered_member(ls, memb);
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ls->ls_num_nodes++;
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return 0;
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}
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static struct dlm_member *find_memb(struct list_head *head, int nodeid)
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{
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struct dlm_member *memb;
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list_for_each_entry(memb, head, list) {
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if (memb->nodeid == nodeid)
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return memb;
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}
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return NULL;
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}
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int dlm_is_member(struct dlm_ls *ls, int nodeid)
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{
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if (find_memb(&ls->ls_nodes, nodeid))
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return 1;
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return 0;
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}
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int dlm_is_removed(struct dlm_ls *ls, int nodeid)
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{
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if (find_memb(&ls->ls_nodes_gone, nodeid))
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return 1;
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return 0;
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}
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static void clear_memb_list(struct list_head *head)
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{
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struct dlm_member *memb;
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while (!list_empty(head)) {
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memb = list_entry(head->next, struct dlm_member, list);
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list_del(&memb->list);
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kfree(memb);
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}
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}
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void dlm_clear_members(struct dlm_ls *ls)
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{
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clear_memb_list(&ls->ls_nodes);
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ls->ls_num_nodes = 0;
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}
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void dlm_clear_members_gone(struct dlm_ls *ls)
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{
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clear_memb_list(&ls->ls_nodes_gone);
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}
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static void make_member_array(struct dlm_ls *ls)
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{
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struct dlm_member *memb;
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int i, w, x = 0, total = 0, all_zero = 0, *array;
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kfree(ls->ls_node_array);
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ls->ls_node_array = NULL;
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list_for_each_entry(memb, &ls->ls_nodes, list) {
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if (memb->weight)
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total += memb->weight;
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}
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/* all nodes revert to weight of 1 if all have weight 0 */
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if (!total) {
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total = ls->ls_num_nodes;
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all_zero = 1;
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}
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ls->ls_total_weight = total;
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array = kmalloc_array(total, sizeof(*array), GFP_NOFS);
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if (!array)
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return;
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list_for_each_entry(memb, &ls->ls_nodes, list) {
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if (!all_zero && !memb->weight)
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continue;
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if (all_zero)
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w = 1;
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else
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w = memb->weight;
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DLM_ASSERT(x < total, printk("total %d x %d\n", total, x););
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for (i = 0; i < w; i++)
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array[x++] = memb->nodeid;
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}
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ls->ls_node_array = array;
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}
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/* send a status request to all members just to establish comms connections */
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static int ping_members(struct dlm_ls *ls)
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{
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struct dlm_member *memb;
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int error = 0;
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list_for_each_entry(memb, &ls->ls_nodes, list) {
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error = dlm_recovery_stopped(ls);
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if (error)
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break;
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error = dlm_rcom_status(ls, memb->nodeid, 0);
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if (error)
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break;
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}
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if (error)
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log_rinfo(ls, "ping_members aborted %d last nodeid %d",
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error, ls->ls_recover_nodeid);
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return error;
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}
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static void dlm_lsop_recover_prep(struct dlm_ls *ls)
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{
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if (!ls->ls_ops || !ls->ls_ops->recover_prep)
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return;
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ls->ls_ops->recover_prep(ls->ls_ops_arg);
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}
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static void dlm_lsop_recover_slot(struct dlm_ls *ls, struct dlm_member *memb)
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{
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struct dlm_slot slot;
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uint32_t seq;
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int error;
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if (!ls->ls_ops || !ls->ls_ops->recover_slot)
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return;
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/* if there is no comms connection with this node
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or the present comms connection is newer
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than the one when this member was added, then
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we consider the node to have failed (versus
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being removed due to dlm_release_lockspace) */
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error = dlm_comm_seq(memb->nodeid, &seq);
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if (!error && seq == memb->comm_seq)
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return;
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slot.nodeid = memb->nodeid;
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slot.slot = memb->slot;
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ls->ls_ops->recover_slot(ls->ls_ops_arg, &slot);
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}
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void dlm_lsop_recover_done(struct dlm_ls *ls)
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{
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struct dlm_member *memb;
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struct dlm_slot *slots;
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int i, num;
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|
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if (!ls->ls_ops || !ls->ls_ops->recover_done)
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return;
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num = ls->ls_num_nodes;
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slots = kcalloc(num, sizeof(*slots), GFP_KERNEL);
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if (!slots)
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return;
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i = 0;
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list_for_each_entry(memb, &ls->ls_nodes, list) {
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if (i == num) {
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log_error(ls, "dlm_lsop_recover_done bad num %d", num);
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goto out;
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}
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slots[i].nodeid = memb->nodeid;
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slots[i].slot = memb->slot;
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i++;
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}
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|
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ls->ls_ops->recover_done(ls->ls_ops_arg, slots, num,
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ls->ls_slot, ls->ls_generation);
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out:
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kfree(slots);
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}
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|
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static struct dlm_config_node *find_config_node(struct dlm_recover *rv,
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int nodeid)
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{
|
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int i;
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for (i = 0; i < rv->nodes_count; i++) {
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if (rv->nodes[i].nodeid == nodeid)
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return &rv->nodes[i];
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}
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return NULL;
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}
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|
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int dlm_recover_members(struct dlm_ls *ls, struct dlm_recover *rv, int *neg_out)
|
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{
|
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struct dlm_member *memb, *safe;
|
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struct dlm_config_node *node;
|
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int i, error, neg = 0, low = -1;
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|
|
/* previously removed members that we've not finished removing need to
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count as a negative change so the "neg" recovery steps will happen */
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|
|
list_for_each_entry(memb, &ls->ls_nodes_gone, list) {
|
|
log_rinfo(ls, "prev removed member %d", memb->nodeid);
|
|
neg++;
|
|
}
|
|
|
|
/* move departed members from ls_nodes to ls_nodes_gone */
|
|
|
|
list_for_each_entry_safe(memb, safe, &ls->ls_nodes, list) {
|
|
node = find_config_node(rv, memb->nodeid);
|
|
if (node && !node->new)
|
|
continue;
|
|
|
|
if (!node) {
|
|
log_rinfo(ls, "remove member %d", memb->nodeid);
|
|
} else {
|
|
/* removed and re-added */
|
|
log_rinfo(ls, "remove member %d comm_seq %u %u",
|
|
memb->nodeid, memb->comm_seq, node->comm_seq);
|
|
}
|
|
|
|
neg++;
|
|
list_move(&memb->list, &ls->ls_nodes_gone);
|
|
ls->ls_num_nodes--;
|
|
dlm_lsop_recover_slot(ls, memb);
|
|
}
|
|
|
|
/* add new members to ls_nodes */
|
|
|
|
for (i = 0; i < rv->nodes_count; i++) {
|
|
node = &rv->nodes[i];
|
|
if (dlm_is_member(ls, node->nodeid))
|
|
continue;
|
|
dlm_add_member(ls, node);
|
|
log_rinfo(ls, "add member %d", node->nodeid);
|
|
}
|
|
|
|
list_for_each_entry(memb, &ls->ls_nodes, list) {
|
|
if (low == -1 || memb->nodeid < low)
|
|
low = memb->nodeid;
|
|
}
|
|
ls->ls_low_nodeid = low;
|
|
|
|
make_member_array(ls);
|
|
*neg_out = neg;
|
|
|
|
error = ping_members(ls);
|
|
if (!error || error == -EPROTO) {
|
|
/* new_lockspace() may be waiting to know if the config
|
|
is good or bad */
|
|
ls->ls_members_result = error;
|
|
complete(&ls->ls_members_done);
|
|
}
|
|
|
|
log_rinfo(ls, "dlm_recover_members %d nodes", ls->ls_num_nodes);
|
|
return error;
|
|
}
|
|
|
|
/* Userspace guarantees that dlm_ls_stop() has completed on all nodes before
|
|
dlm_ls_start() is called on any of them to start the new recovery. */
|
|
|
|
int dlm_ls_stop(struct dlm_ls *ls)
|
|
{
|
|
int new;
|
|
|
|
/*
|
|
* Prevent dlm_recv from being in the middle of something when we do
|
|
* the stop. This includes ensuring dlm_recv isn't processing a
|
|
* recovery message (rcom), while dlm_recoverd is aborting and
|
|
* resetting things from an in-progress recovery. i.e. we want
|
|
* dlm_recoverd to abort its recovery without worrying about dlm_recv
|
|
* processing an rcom at the same time. Stopping dlm_recv also makes
|
|
* it easy for dlm_receive_message() to check locking stopped and add a
|
|
* message to the requestqueue without races.
|
|
*/
|
|
|
|
down_write(&ls->ls_recv_active);
|
|
|
|
/*
|
|
* Abort any recovery that's in progress (see RECOVER_STOP,
|
|
* dlm_recovery_stopped()) and tell any other threads running in the
|
|
* dlm to quit any processing (see RUNNING, dlm_locking_stopped()).
|
|
*/
|
|
|
|
spin_lock(&ls->ls_recover_lock);
|
|
set_bit(LSFL_RECOVER_STOP, &ls->ls_flags);
|
|
new = test_and_clear_bit(LSFL_RUNNING, &ls->ls_flags);
|
|
ls->ls_recover_seq++;
|
|
spin_unlock(&ls->ls_recover_lock);
|
|
|
|
/*
|
|
* Let dlm_recv run again, now any normal messages will be saved on the
|
|
* requestqueue for later.
|
|
*/
|
|
|
|
up_write(&ls->ls_recv_active);
|
|
|
|
/*
|
|
* This in_recovery lock does two things:
|
|
* 1) Keeps this function from returning until all threads are out
|
|
* of locking routines and locking is truly stopped.
|
|
* 2) Keeps any new requests from being processed until it's unlocked
|
|
* when recovery is complete.
|
|
*/
|
|
|
|
if (new) {
|
|
set_bit(LSFL_RECOVER_DOWN, &ls->ls_flags);
|
|
wake_up_process(ls->ls_recoverd_task);
|
|
wait_event(ls->ls_recover_lock_wait,
|
|
test_bit(LSFL_RECOVER_LOCK, &ls->ls_flags));
|
|
}
|
|
|
|
/*
|
|
* The recoverd suspend/resume makes sure that dlm_recoverd (if
|
|
* running) has noticed RECOVER_STOP above and quit processing the
|
|
* previous recovery.
|
|
*/
|
|
|
|
dlm_recoverd_suspend(ls);
|
|
|
|
spin_lock(&ls->ls_recover_lock);
|
|
kfree(ls->ls_slots);
|
|
ls->ls_slots = NULL;
|
|
ls->ls_num_slots = 0;
|
|
ls->ls_slots_size = 0;
|
|
ls->ls_recover_status = 0;
|
|
spin_unlock(&ls->ls_recover_lock);
|
|
|
|
dlm_recoverd_resume(ls);
|
|
|
|
if (!ls->ls_recover_begin)
|
|
ls->ls_recover_begin = jiffies;
|
|
|
|
dlm_lsop_recover_prep(ls);
|
|
return 0;
|
|
}
|
|
|
|
int dlm_ls_start(struct dlm_ls *ls)
|
|
{
|
|
struct dlm_recover *rv, *rv_old;
|
|
struct dlm_config_node *nodes;
|
|
int error, count;
|
|
|
|
rv = kzalloc(sizeof(*rv), GFP_NOFS);
|
|
if (!rv)
|
|
return -ENOMEM;
|
|
|
|
error = dlm_config_nodes(ls->ls_name, &nodes, &count);
|
|
if (error < 0)
|
|
goto fail;
|
|
|
|
spin_lock(&ls->ls_recover_lock);
|
|
|
|
/* the lockspace needs to be stopped before it can be started */
|
|
|
|
if (!dlm_locking_stopped(ls)) {
|
|
spin_unlock(&ls->ls_recover_lock);
|
|
log_error(ls, "start ignored: lockspace running");
|
|
error = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
rv->nodes = nodes;
|
|
rv->nodes_count = count;
|
|
rv->seq = ++ls->ls_recover_seq;
|
|
rv_old = ls->ls_recover_args;
|
|
ls->ls_recover_args = rv;
|
|
spin_unlock(&ls->ls_recover_lock);
|
|
|
|
if (rv_old) {
|
|
log_error(ls, "unused recovery %llx %d",
|
|
(unsigned long long)rv_old->seq, rv_old->nodes_count);
|
|
kfree(rv_old->nodes);
|
|
kfree(rv_old);
|
|
}
|
|
|
|
set_bit(LSFL_RECOVER_WORK, &ls->ls_flags);
|
|
wake_up_process(ls->ls_recoverd_task);
|
|
return 0;
|
|
|
|
fail:
|
|
kfree(rv);
|
|
kfree(nodes);
|
|
return error;
|
|
}
|
|
|