diff options
Diffstat (limited to 'fs/dlm')
| -rw-r--r-- | fs/dlm/lowcomms.c | 171 |
1 files changed, 92 insertions, 79 deletions
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c index 982314c472c1..609108a83267 100644 --- a/fs/dlm/lowcomms.c +++ b/fs/dlm/lowcomms.c @@ -2,7 +2,7 @@ ******************************************************************************* ** ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. -** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. +** Copyright (C) 2004-2009 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 @@ -48,7 +48,6 @@ #include <net/sock.h> #include <net/tcp.h> #include <linux/pagemap.h> -#include <linux/idr.h> #include <linux/file.h> #include <linux/mutex.h> #include <linux/sctp.h> @@ -61,6 +60,7 @@ #include "config.h" #define NEEDED_RMEM (4*1024*1024) +#define CONN_HASH_SIZE 32 struct cbuf { unsigned int base; @@ -115,6 +115,7 @@ struct connection { int retries; #define MAX_CONNECT_RETRIES 3 int sctp_assoc; + struct hlist_node list; struct connection *othercon; struct work_struct rwork; /* Receive workqueue */ struct work_struct swork; /* Send workqueue */ @@ -139,14 +140,37 @@ static int dlm_local_count; static struct workqueue_struct *recv_workqueue; static struct workqueue_struct *send_workqueue; -static DEFINE_IDR(connections_idr); +static struct hlist_head connection_hash[CONN_HASH_SIZE]; static DEFINE_MUTEX(connections_lock); -static int max_nodeid; static struct kmem_cache *con_cache; static void process_recv_sockets(struct work_struct *work); static void process_send_sockets(struct work_struct *work); + +/* This is deliberately very simple because most clusters have simple + sequential nodeids, so we should be able to go straight to a connection + struct in the array */ +static inline int nodeid_hash(int nodeid) +{ + return nodeid & (CONN_HASH_SIZE-1); +} + +static struct connection *__find_con(int nodeid) +{ + int r; + struct hlist_node *h; + struct connection *con; + + r = nodeid_hash(nodeid); + + hlist_for_each_entry(con, h, &connection_hash[r], list) { + if (con->nodeid == nodeid) + return con; + } + return NULL; +} + /* * If 'allocation' is zero then we don't attempt to create a new * connection structure for this node. @@ -155,31 +179,17 @@ static struct connection *__nodeid2con(int nodeid, gfp_t alloc) { struct connection *con = NULL; int r; - int n; - con = idr_find(&connections_idr, nodeid); + con = __find_con(nodeid); if (con || !alloc) return con; - r = idr_pre_get(&connections_idr, alloc); - if (!r) - return NULL; - con = kmem_cache_zalloc(con_cache, alloc); if (!con) return NULL; - r = idr_get_new_above(&connections_idr, con, nodeid, &n); - if (r) { - kmem_cache_free(con_cache, con); - return NULL; - } - - if (n != nodeid) { - idr_remove(&connections_idr, n); - kmem_cache_free(con_cache, con); - return NULL; - } + r = nodeid_hash(nodeid); + hlist_add_head(&con->list, &connection_hash[r]); con->nodeid = nodeid; mutex_init(&con->sock_mutex); @@ -190,19 +200,30 @@ static struct connection *__nodeid2con(int nodeid, gfp_t alloc) /* Setup action pointers for child sockets */ if (con->nodeid) { - struct connection *zerocon = idr_find(&connections_idr, 0); + struct connection *zerocon = __find_con(0); con->connect_action = zerocon->connect_action; if (!con->rx_action) con->rx_action = zerocon->rx_action; } - if (nodeid > max_nodeid) - max_nodeid = nodeid; - return con; } +/* Loop round all connections */ +static void foreach_conn(void (*conn_func)(struct connection *c)) +{ + int i; + struct hlist_node *h, *n; + struct connection *con; + + for (i = 0; i < CONN_HASH_SIZE; i++) { + hlist_for_each_entry_safe(con, h, n, &connection_hash[i], list){ + conn_func(con); + } + } +} + static struct connection *nodeid2con(int nodeid, gfp_t allocation) { struct connection *con; @@ -218,14 +239,17 @@ static struct connection *nodeid2con(int nodeid, gfp_t allocation) static struct connection *assoc2con(int assoc_id) { int i; + struct hlist_node *h; struct connection *con; mutex_lock(&connections_lock); - for (i=0; i<=max_nodeid; i++) { - con = __nodeid2con(i, 0); - if (con && con->sctp_assoc == assoc_id) { - mutex_unlock(&connections_lock); - return con; + + for (i = 0 ; i < CONN_HASH_SIZE; i++) { + hlist_for_each_entry(con, h, &connection_hash[i], list) { + if (con && con->sctp_assoc == assoc_id) { + mutex_unlock(&connections_lock); + return con; + } } } mutex_unlock(&connections_lock); @@ -376,25 +400,23 @@ static void sctp_send_shutdown(sctp_assoc_t associd) log_print("send EOF to node failed: %d", ret); } +static void sctp_init_failed_foreach(struct connection *con) +{ + con->sctp_assoc = 0; + if (test_and_clear_bit(CF_CONNECT_PENDING, &con->flags)) { + if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) + queue_work(send_workqueue, &con->swork); + } +} + /* INIT failed but we don't know which node... restart INIT on all pending nodes */ static void sctp_init_failed(void) { - int i; - struct connection *con; - mutex_lock(&connections_lock); - for (i=1; i<=max_nodeid; i++) { - con = __nodeid2con(i, 0); - if (!con) - continue; - con->sctp_assoc = 0; - if (test_and_clear_bit(CF_CONNECT_PENDING, &con->flags)) { - if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) { - queue_work(send_workqueue, &con->swork); - } - } - } + + foreach_conn(sctp_init_failed_foreach); + mutex_unlock(&connections_lock); } @@ -1313,13 +1335,10 @@ out_connect: static void clean_one_writequeue(struct connection *con) { - struct list_head *list; - struct list_head *temp; + struct writequeue_entry *e, *safe; spin_lock(&con->writequeue_lock); - list_for_each_safe(list, temp, &con->writequeue) { - struct writequeue_entry *e = - list_entry(list, struct writequeue_entry, list); + list_for_each_entry_safe(e, safe, &con->writequeue, list) { list_del(&e->list); free_entry(e); } @@ -1369,14 +1388,7 @@ static void process_send_sockets(struct work_struct *work) /* Discard all entries on the write queues */ static void clean_writequeues(void) { - int nodeid; - - for (nodeid = 1; nodeid <= max_nodeid; nodeid++) { - struct connection *con = __nodeid2con(nodeid, 0); - - if (con) - clean_one_writequeue(con); - } + foreach_conn(clean_one_writequeue); } static void work_stop(void) @@ -1406,23 +1418,29 @@ static int work_start(void) return 0; } -void dlm_lowcomms_stop(void) +static void stop_conn(struct connection *con) { - int i; - struct connection *con; + con->flags |= 0x0F; + if (con->sock) + con->sock->sk->sk_user_data = NULL; +} +static void free_conn(struct connection *con) +{ + close_connection(con, true); + if (con->othercon) + kmem_cache_free(con_cache, con->othercon); + hlist_del(&con->list); + kmem_cache_free(con_cache, con); +} + +void dlm_lowcomms_stop(void) +{ /* Set all the flags to prevent any socket activity. */ mutex_lock(&connections_lock); - for (i = 0; i <= max_nodeid; i++) { - con = __nodeid2con(i, 0); - if (con) { - con->flags |= 0x0F; - if (con->sock) - con->sock->sk->sk_user_data = NULL; - } - } + foreach_conn(stop_conn); mutex_unlock(&connections_lock); work_stop(); @@ -1430,25 +1448,20 @@ void dlm_lowcomms_stop(void) mutex_lock(&connections_lock); clean_writequeues(); - for (i = 0; i <= max_nodeid; i++) { - con = __nodeid2con(i, 0); - if (con) { - close_connection(con, true); - if (con->othercon) - kmem_cache_free(con_cache, con->othercon); - kmem_cache_free(con_cache, con); - } - } - max_nodeid = 0; + foreach_conn(free_conn); + mutex_unlock(&connections_lock); kmem_cache_destroy(con_cache); - idr_init(&connections_idr); } int dlm_lowcomms_start(void) { int error = -EINVAL; struct connection *con; + int i; + + for (i = 0; i < CONN_HASH_SIZE; i++) + INIT_HLIST_HEAD(&connection_hash[i]); init_local(); if (!dlm_local_count) { |