![David Teigland](/assets/img/avatar_default.png)
New features: lock timeouts and time warnings. If the DLM_LKF_TIMEOUT flag is set, then the request/conversion will be canceled after waiting the specified number of centiseconds (specified per lock). This feature is only available for locks requested through libdlm (can be enabled for kernel dlm users if there's a use for it.) If the new DLM_LSFL_TIMEWARN flag is set when creating the lockspace, then a warning message will be sent to userspace (using genetlink) after a request/conversion has been waiting for a given number of centiseconds (configurable per node). The time warnings will be used in the future to do deadlock detection in userspace. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
339 lines
7.3 KiB
C
339 lines
7.3 KiB
C
/******************************************************************************
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*******************************************************************************
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**
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** Copyright (C) 2005-2007 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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/*
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* Following called by dlm_recoverd thread
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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, int nodeid)
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{
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struct dlm_member *memb;
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int w;
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memb = kzalloc(sizeof(struct dlm_member), GFP_KERNEL);
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if (!memb)
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return -ENOMEM;
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w = dlm_node_weight(ls->ls_name, nodeid);
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if (w < 0)
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return w;
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memb->nodeid = nodeid;
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memb->weight = w;
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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 void dlm_remove_member(struct dlm_ls *ls, struct dlm_member *memb)
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{
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list_move(&memb->list, &ls->ls_nodes_gone);
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ls->ls_num_nodes--;
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}
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static int dlm_is_member(struct dlm_ls *ls, int nodeid)
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{
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struct dlm_member *memb;
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list_for_each_entry(memb, &ls->ls_nodes, list) {
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if (memb->nodeid == nodeid)
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return 1;
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}
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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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struct dlm_member *memb;
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list_for_each_entry(memb, &ls->ls_nodes_gone, list) {
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if (memb->nodeid == nodeid)
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return 1;
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}
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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(sizeof(int) * total, GFP_KERNEL);
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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);
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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_debug(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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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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int i, error, found, pos = 0, 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) {
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log_debug(ls, "prev removed member %d", memb->nodeid);
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neg++;
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}
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/* move departed members from ls_nodes to ls_nodes_gone */
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list_for_each_entry_safe(memb, safe, &ls->ls_nodes, list) {
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found = 0;
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for (i = 0; i < rv->node_count; i++) {
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if (memb->nodeid == rv->nodeids[i]) {
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found = 1;
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break;
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}
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}
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if (!found) {
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neg++;
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dlm_remove_member(ls, memb);
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log_debug(ls, "remove member %d", memb->nodeid);
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}
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}
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/* add new members to ls_nodes */
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for (i = 0; i < rv->node_count; i++) {
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if (dlm_is_member(ls, rv->nodeids[i]))
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continue;
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dlm_add_member(ls, rv->nodeids[i]);
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pos++;
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log_debug(ls, "add member %d", rv->nodeids[i]);
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}
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list_for_each_entry(memb, &ls->ls_nodes, list) {
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if (low == -1 || memb->nodeid < low)
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low = memb->nodeid;
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}
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ls->ls_low_nodeid = low;
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make_member_array(ls);
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dlm_set_recover_status(ls, DLM_RS_NODES);
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*neg_out = neg;
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error = ping_members(ls);
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if (error)
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goto out;
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error = dlm_recover_members_wait(ls);
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out:
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log_debug(ls, "total members %d error %d", ls->ls_num_nodes, error);
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return error;
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}
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/*
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* Following called from lockspace.c
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*/
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int dlm_ls_stop(struct dlm_ls *ls)
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{
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int new;
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/*
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* A stop cancels any recovery that's in progress (see RECOVERY_STOP,
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* dlm_recovery_stopped()) and prevents any new locks from being
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* processed (see RUNNING, dlm_locking_stopped()).
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*/
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spin_lock(&ls->ls_recover_lock);
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set_bit(LSFL_RECOVERY_STOP, &ls->ls_flags);
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new = test_and_clear_bit(LSFL_RUNNING, &ls->ls_flags);
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ls->ls_recover_seq++;
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spin_unlock(&ls->ls_recover_lock);
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/*
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* This in_recovery lock does two things:
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*
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* 1) Keeps this function from returning until all threads are out
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* of locking routines and locking is truely stopped.
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* 2) Keeps any new requests from being processed until it's unlocked
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* when recovery is complete.
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*/
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if (new)
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down_write(&ls->ls_in_recovery);
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/*
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* The recoverd suspend/resume makes sure that dlm_recoverd (if
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* running) has noticed the clearing of RUNNING above and quit
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* processing the previous recovery. This will be true for all nodes
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* before any nodes start the new recovery.
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*/
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dlm_recoverd_suspend(ls);
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ls->ls_recover_status = 0;
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dlm_recoverd_resume(ls);
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if (!ls->ls_recover_begin)
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ls->ls_recover_begin = jiffies;
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return 0;
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}
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int dlm_ls_start(struct dlm_ls *ls)
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{
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struct dlm_recover *rv = NULL, *rv_old;
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int *ids = NULL;
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int error, count;
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rv = kzalloc(sizeof(struct dlm_recover), GFP_KERNEL);
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if (!rv)
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return -ENOMEM;
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error = count = dlm_nodeid_list(ls->ls_name, &ids);
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if (error <= 0)
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goto fail;
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spin_lock(&ls->ls_recover_lock);
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/* the lockspace needs to be stopped before it can be started */
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if (!dlm_locking_stopped(ls)) {
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spin_unlock(&ls->ls_recover_lock);
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log_error(ls, "start ignored: lockspace running");
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error = -EINVAL;
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goto fail;
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}
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rv->nodeids = ids;
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rv->node_count = count;
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rv->seq = ++ls->ls_recover_seq;
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rv_old = ls->ls_recover_args;
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ls->ls_recover_args = rv;
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spin_unlock(&ls->ls_recover_lock);
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if (rv_old) {
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kfree(rv_old->nodeids);
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kfree(rv_old);
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}
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dlm_recoverd_kick(ls);
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return 0;
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fail:
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kfree(rv);
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kfree(ids);
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return error;
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}
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