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/******************************************************************************
*******************************************************************************
**
** Copyright (C) 2005-2011 Red Hat, Inc. All rights reserved.
**
** 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 General Public License v.2.
**
*******************************************************************************
******************************************************************************/
#include "dlm_internal.h"
#include "lockspace.h"
#include "member.h"
#include "recoverd.h"
#include "recover.h"
#include "rcom.h"
#include "config.h"
#include "lowcomms.h"
int dlm_slots_version(struct dlm_header *h)
{
if ((h->h_version & 0x0000FFFF) < DLM_HEADER_SLOTS)
return 0;
return 1;
}
void dlm_slot_save(struct dlm_ls *ls, struct dlm_rcom *rc,
struct dlm_member *memb)
{
struct rcom_config *rf = (struct rcom_config *)rc->rc_buf;
if (!dlm_slots_version(&rc->rc_header))
return;
memb->slot = le16_to_cpu(rf->rf_our_slot);
memb->generation = le32_to_cpu(rf->rf_generation);
}
void dlm_slots_copy_out(struct dlm_ls *ls, struct dlm_rcom *rc)
{
struct dlm_slot *slot;
struct rcom_slot *ro;
int i;
ro = (struct rcom_slot *)(rc->rc_buf + sizeof(struct rcom_config));
/* ls_slots array is sparse, but not rcom_slots */
for (i = 0; i < ls->ls_slots_size; i++) {
slot = &ls->ls_slots[i];
if (!slot->nodeid)
continue;
ro->ro_nodeid = cpu_to_le32(slot->nodeid);
ro->ro_slot = cpu_to_le16(slot->slot);
ro++;
}
}
#define SLOT_DEBUG_LINE 128
static void log_debug_slots(struct dlm_ls *ls, uint32_t gen, int num_slots,
struct rcom_slot *ro0, struct dlm_slot *array,
int array_size)
{
char line[SLOT_DEBUG_LINE];
int len = SLOT_DEBUG_LINE - 1;
int pos = 0;
int ret, i;
if (!dlm_config.ci_log_debug)
return;
memset(line, 0, sizeof(line));
if (array) {
for (i = 0; i < array_size; i++) {
if (!array[i].nodeid)
continue;
ret = snprintf(line + pos, len - pos, " %d:%d",
array[i].slot, array[i].nodeid);
if (ret >= len - pos)
break;
pos += ret;
}
} else if (ro0) {
for (i = 0; i < num_slots; i++) {
ret = snprintf(line + pos, len - pos, " %d:%d",
ro0[i].ro_slot, ro0[i].ro_nodeid);
if (ret >= len - pos)
break;
pos += ret;
}
}
log_debug(ls, "generation %u slots %d%s", gen, num_slots, line);
}
int dlm_slots_copy_in(struct dlm_ls *ls)
{
struct dlm_member *memb;
struct dlm_rcom *rc = ls->ls_recover_buf;
struct rcom_config *rf = (struct rcom_config *)rc->rc_buf;
struct rcom_slot *ro0, *ro;
int our_nodeid = dlm_our_nodeid();
int i, num_slots;
uint32_t gen;
if (!dlm_slots_version(&rc->rc_header))
return -1;
gen = le32_to_cpu(rf->rf_generation);
if (gen <= ls->ls_generation) {
log_error(ls, "dlm_slots_copy_in gen %u old %u",
gen, ls->ls_generation);
}
ls->ls_generation = gen;
num_slots = le16_to_cpu(rf->rf_num_slots);
if (!num_slots)
return -1;
ro0 = (struct rcom_slot *)(rc->rc_buf + sizeof(struct rcom_config));
for (i = 0, ro = ro0; i < num_slots; i++, ro++) {
ro->ro_nodeid = le32_to_cpu(ro->ro_nodeid);
ro->ro_slot = le16_to_cpu(ro->ro_slot);
}
log_debug_slots(ls, gen, num_slots, ro0, NULL, 0);
list_for_each_entry(memb, &ls->ls_nodes, list) {
for (i = 0, ro = ro0; i < num_slots; i++, ro++) {
if (ro->ro_nodeid != memb->nodeid)
continue;
memb->slot = ro->ro_slot;
memb->slot_prev = memb->slot;
break;
}
if (memb->nodeid == our_nodeid) {
if (ls->ls_slot && ls->ls_slot != memb->slot) {
log_error(ls, "dlm_slots_copy_in our slot "
"changed %d %d", ls->ls_slot,
memb->slot);
return -1;
}
if (!ls->ls_slot)
ls->ls_slot = memb->slot;
}
if (!memb->slot) {
log_error(ls, "dlm_slots_copy_in nodeid %d no slot",
memb->nodeid);
return -1;
}
}
return 0;
}
/* for any nodes that do not support slots, we will not have set memb->slot
in wait_status_all(), so memb->slot will remain -1, and we will not
assign slots or set ls_num_slots here */
int dlm_slots_assign(struct dlm_ls *ls, int *num_slots, int *slots_size,
struct dlm_slot **slots_out, uint32_t *gen_out)
{
struct dlm_member *memb;
struct dlm_slot *array;
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