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dlm: replace idr with hash table for connections
Integer nodeids can be too large for the idr code; use a hash table instead. Signed-off-by: Christine Caulfield <ccaulfie@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Christine Caulfield
David Teigland
parent
2cf12c0bf2
commit
5e9ccc372d
@ -2,7 +2,7 @@
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*******************************************************************************
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**
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** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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** Copyright (C) 2004-2009 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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@ -48,7 +48,6 @@
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#include <net/sock.h>
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#include <net/tcp.h>
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#include <linux/pagemap.h>
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#include <linux/idr.h>
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#include <linux/file.h>
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#include <linux/mutex.h>
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#include <linux/sctp.h>
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@ -61,6 +60,7 @@
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#include "config.h"
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#define NEEDED_RMEM (4*1024*1024)
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#define CONN_HASH_SIZE 32
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struct cbuf {
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unsigned int base;
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@ -115,6 +115,7 @@ struct connection {
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int retries;
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#define MAX_CONNECT_RETRIES 3
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int sctp_assoc;
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struct hlist_node list;
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struct connection *othercon;
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struct work_struct rwork; /* Receive workqueue */
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struct work_struct swork; /* Send workqueue */
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@ -139,14 +140,37 @@ static int dlm_local_count;
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static struct workqueue_struct *recv_workqueue;
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static struct workqueue_struct *send_workqueue;
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static DEFINE_IDR(connections_idr);
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static struct hlist_head connection_hash[CONN_HASH_SIZE];
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static DEFINE_MUTEX(connections_lock);
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static int max_nodeid;
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static struct kmem_cache *con_cache;
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static void process_recv_sockets(struct work_struct *work);
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static void process_send_sockets(struct work_struct *work);
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/* This is deliberately very simple because most clusters have simple
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sequential nodeids, so we should be able to go straight to a connection
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struct in the array */
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static inline int nodeid_hash(int nodeid)
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{
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return nodeid & (CONN_HASH_SIZE-1);
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}
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static struct connection *__find_con(int nodeid)
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{
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int r;
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struct hlist_node *h;
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struct connection *con;
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r = nodeid_hash(nodeid);
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hlist_for_each_entry(con, h, &connection_hash[r], list) {
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if (con->nodeid == nodeid)
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return con;
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}
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return NULL;
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}
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/*
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* If 'allocation' is zero then we don't attempt to create a new
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* connection structure for this node.
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@ -155,31 +179,17 @@ static struct connection *__nodeid2con(int nodeid, gfp_t alloc)
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{
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struct connection *con = NULL;
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int r;
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int n;
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con = idr_find(&connections_idr, nodeid);
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con = __find_con(nodeid);
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if (con || !alloc)
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return con;
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r = idr_pre_get(&connections_idr, alloc);
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if (!r)
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return NULL;
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con = kmem_cache_zalloc(con_cache, alloc);
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if (!con)
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return NULL;
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r = idr_get_new_above(&connections_idr, con, nodeid, &n);
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if (r) {
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kmem_cache_free(con_cache, con);
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return NULL;
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}
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if (n != nodeid) {
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idr_remove(&connections_idr, n);
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kmem_cache_free(con_cache, con);
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return NULL;
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}
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r = nodeid_hash(nodeid);
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hlist_add_head(&con->list, &connection_hash[r]);
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con->nodeid = nodeid;
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mutex_init(&con->sock_mutex);
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@ -190,19 +200,30 @@ static struct connection *__nodeid2con(int nodeid, gfp_t alloc)
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/* Setup action pointers for child sockets */
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if (con->nodeid) {
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struct connection *zerocon = idr_find(&connections_idr, 0);
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struct connection *zerocon = __find_con(0);
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con->connect_action = zerocon->connect_action;
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if (!con->rx_action)
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con->rx_action = zerocon->rx_action;
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}
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if (nodeid > max_nodeid)
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max_nodeid = nodeid;
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return con;
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}
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/* Loop round all connections */
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static void foreach_conn(void (*conn_func)(struct connection *c))
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{
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int i;
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struct hlist_node *h, *n;
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struct connection *con;
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for (i = 0; i < CONN_HASH_SIZE; i++) {
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hlist_for_each_entry_safe(con, h, n, &connection_hash[i], list){
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conn_func(con);
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}
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}
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}
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static struct connection *nodeid2con(int nodeid, gfp_t allocation)
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{
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struct connection *con;
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@ -218,14 +239,17 @@ static struct connection *nodeid2con(int nodeid, gfp_t allocation)
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static struct connection *assoc2con(int assoc_id)
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{
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int i;
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struct hlist_node *h;
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struct connection *con;
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mutex_lock(&connections_lock);
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for (i=0; i<=max_nodeid; i++) {
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con = __nodeid2con(i, 0);
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if (con && con->sctp_assoc == assoc_id) {
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mutex_unlock(&connections_lock);
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return con;
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for (i = 0 ; i < CONN_HASH_SIZE; i++) {
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hlist_for_each_entry(con, h, &connection_hash[i], list) {
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if (con && con->sctp_assoc == assoc_id) {
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mutex_unlock(&connections_lock);
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return con;
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}
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}
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}
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mutex_unlock(&connections_lock);
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@ -376,25 +400,23 @@ static void sctp_send_shutdown(sctp_assoc_t associd)
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log_print("send EOF to node failed: %d", ret);
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}
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static void sctp_init_failed_foreach(struct connection *con)
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{
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con->sctp_assoc = 0;
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if (test_and_clear_bit(CF_CONNECT_PENDING, &con->flags)) {
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if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags))
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queue_work(send_workqueue, &con->swork);
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}
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}
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/* INIT failed but we don't know which node...
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restart INIT on all pending nodes */
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static void sctp_init_failed(void)
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{
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int i;
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struct connection *con;
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mutex_lock(&connections_lock);
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for (i=1; i<=max_nodeid; i++) {
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con = __nodeid2con(i, 0);
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if (!con)
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continue;
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con->sctp_assoc = 0;
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if (test_and_clear_bit(CF_CONNECT_PENDING, &con->flags)) {
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if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) {
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queue_work(send_workqueue, &con->swork);
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}
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}
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}
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foreach_conn(sctp_init_failed_foreach);
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mutex_unlock(&connections_lock);
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}
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@ -1313,13 +1335,10 @@ out_connect:
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static void clean_one_writequeue(struct connection *con)
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{
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struct list_head *list;
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struct list_head *temp;
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struct writequeue_entry *e, *safe;
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spin_lock(&con->writequeue_lock);
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list_for_each_safe(list, temp, &con->writequeue) {
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struct writequeue_entry *e =
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list_entry(list, struct writequeue_entry, list);
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list_for_each_entry_safe(e, safe, &con->writequeue, list) {
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list_del(&e->list);
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free_entry(e);
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}
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@ -1369,14 +1388,7 @@ static void process_send_sockets(struct work_struct *work)
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/* Discard all entries on the write queues */
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static void clean_writequeues(void)
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{
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int nodeid;
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for (nodeid = 1; nodeid <= max_nodeid; nodeid++) {
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struct connection *con = __nodeid2con(nodeid, 0);
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if (con)
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clean_one_writequeue(con);
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}
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foreach_conn(clean_one_writequeue);
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}
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static void work_stop(void)
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@ -1406,23 +1418,29 @@ static int work_start(void)
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return 0;
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}
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static void stop_conn(struct connection *con)
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{
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con->flags |= 0x0F;
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if (con->sock)
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con->sock->sk->sk_user_data = NULL;
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}
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static void free_conn(struct connection *con)
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{
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close_connection(con, true);
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if (con->othercon)
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kmem_cache_free(con_cache, con->othercon);
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hlist_del(&con->list);
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kmem_cache_free(con_cache, con);
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}
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void dlm_lowcomms_stop(void)
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{
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int i;
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struct connection *con;
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/* Set all the flags to prevent any
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socket activity.
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*/
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mutex_lock(&connections_lock);
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for (i = 0; i <= max_nodeid; i++) {
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con = __nodeid2con(i, 0);
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if (con) {
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con->flags |= 0x0F;
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if (con->sock)
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con->sock->sk->sk_user_data = NULL;
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}
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}
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foreach_conn(stop_conn);
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mutex_unlock(&connections_lock);
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work_stop();
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@ -1430,25 +1448,20 @@ void dlm_lowcomms_stop(void)
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mutex_lock(&connections_lock);
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clean_writequeues();
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for (i = 0; i <= max_nodeid; i++) {
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con = __nodeid2con(i, 0);
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if (con) {
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close_connection(con, true);
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if (con->othercon)
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kmem_cache_free(con_cache, con->othercon);
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kmem_cache_free(con_cache, con);
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}
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}
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max_nodeid = 0;
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foreach_conn(free_conn);
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mutex_unlock(&connections_lock);
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kmem_cache_destroy(con_cache);
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idr_init(&connections_idr);
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}
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int dlm_lowcomms_start(void)
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{
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int error = -EINVAL;
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struct connection *con;
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int i;
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for (i = 0; i < CONN_HASH_SIZE; i++)
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INIT_HLIST_HEAD(&connection_hash[i]);
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init_local();
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if (!dlm_local_count) {
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