diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/ocfs2/cluster/tcp.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/ocfs2/cluster/tcp.c | 2150 |
1 files changed, 0 insertions, 2150 deletions
diff --git a/ANDROID_3.4.5/fs/ocfs2/cluster/tcp.c b/ANDROID_3.4.5/fs/ocfs2/cluster/tcp.c deleted file mode 100644 index 044e7b58..00000000 --- a/ANDROID_3.4.5/fs/ocfs2/cluster/tcp.c +++ /dev/null @@ -1,2150 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * Copyright (C) 2004 Oracle. All rights reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public - * License along with this program; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 021110-1307, USA. - * - * ---- - * - * Callers for this were originally written against a very simple synchronus - * API. This implementation reflects those simple callers. Some day I'm sure - * we'll need to move to a more robust posting/callback mechanism. - * - * Transmit calls pass in kernel virtual addresses and block copying this into - * the socket's tx buffers via a usual blocking sendmsg. They'll block waiting - * for a failed socket to timeout. TX callers can also pass in a poniter to an - * 'int' which gets filled with an errno off the wire in response to the - * message they send. - * - * Handlers for unsolicited messages are registered. Each socket has a page - * that incoming data is copied into. First the header, then the data. - * Handlers are called from only one thread with a reference to this per-socket - * page. This page is destroyed after the handler call, so it can't be - * referenced beyond the call. Handlers may block but are discouraged from - * doing so. - * - * Any framing errors (bad magic, large payload lengths) close a connection. - * - * Our sock_container holds the state we associate with a socket. It's current - * framing state is held there as well as the refcounting we do around when it - * is safe to tear down the socket. The socket is only finally torn down from - * the container when the container loses all of its references -- so as long - * as you hold a ref on the container you can trust that the socket is valid - * for use with kernel socket APIs. - * - * Connections are initiated between a pair of nodes when the node with the - * higher node number gets a heartbeat callback which indicates that the lower - * numbered node has started heartbeating. The lower numbered node is passive - * and only accepts the connection if the higher numbered node is heartbeating. - */ - -#include <linux/kernel.h> -#include <linux/jiffies.h> -#include <linux/slab.h> -#include <linux/idr.h> -#include <linux/kref.h> -#include <linux/net.h> -#include <linux/export.h> -#include <net/tcp.h> - -#include <asm/uaccess.h> - -#include "heartbeat.h" -#include "tcp.h" -#include "nodemanager.h" -#define MLOG_MASK_PREFIX ML_TCP -#include "masklog.h" -#include "quorum.h" - -#include "tcp_internal.h" - -#define SC_NODEF_FMT "node %s (num %u) at %pI4:%u" -#define SC_NODEF_ARGS(sc) sc->sc_node->nd_name, sc->sc_node->nd_num, \ - &sc->sc_node->nd_ipv4_address, \ - ntohs(sc->sc_node->nd_ipv4_port) - -/* - * In the following two log macros, the whitespace after the ',' just - * before ##args is intentional. Otherwise, gcc 2.95 will eat the - * previous token if args expands to nothing. - */ -#define msglog(hdr, fmt, args...) do { \ - typeof(hdr) __hdr = (hdr); \ - mlog(ML_MSG, "[mag %u len %u typ %u stat %d sys_stat %d " \ - "key %08x num %u] " fmt, \ - be16_to_cpu(__hdr->magic), be16_to_cpu(__hdr->data_len), \ - be16_to_cpu(__hdr->msg_type), be32_to_cpu(__hdr->status), \ - be32_to_cpu(__hdr->sys_status), be32_to_cpu(__hdr->key), \ - be32_to_cpu(__hdr->msg_num) , ##args); \ -} while (0) - -#define sclog(sc, fmt, args...) do { \ - typeof(sc) __sc = (sc); \ - mlog(ML_SOCKET, "[sc %p refs %d sock %p node %u page %p " \ - "pg_off %zu] " fmt, __sc, \ - atomic_read(&__sc->sc_kref.refcount), __sc->sc_sock, \ - __sc->sc_node->nd_num, __sc->sc_page, __sc->sc_page_off , \ - ##args); \ -} while (0) - -static DEFINE_RWLOCK(o2net_handler_lock); -static struct rb_root o2net_handler_tree = RB_ROOT; - -static struct o2net_node o2net_nodes[O2NM_MAX_NODES]; - -/* XXX someday we'll need better accounting */ -static struct socket *o2net_listen_sock = NULL; - -/* - * listen work is only queued by the listening socket callbacks on the - * o2net_wq. teardown detaches the callbacks before destroying the workqueue. - * quorum work is queued as sock containers are shutdown.. stop_listening - * tears down all the node's sock containers, preventing future shutdowns - * and queued quroum work, before canceling delayed quorum work and - * destroying the work queue. - */ -static struct workqueue_struct *o2net_wq; -static struct work_struct o2net_listen_work; - -static struct o2hb_callback_func o2net_hb_up, o2net_hb_down; -#define O2NET_HB_PRI 0x1 - -static struct o2net_handshake *o2net_hand; -static struct o2net_msg *o2net_keep_req, *o2net_keep_resp; - -static int o2net_sys_err_translations[O2NET_ERR_MAX] = - {[O2NET_ERR_NONE] = 0, - [O2NET_ERR_NO_HNDLR] = -ENOPROTOOPT, - [O2NET_ERR_OVERFLOW] = -EOVERFLOW, - [O2NET_ERR_DIED] = -EHOSTDOWN,}; - -/* can't quite avoid *all* internal declarations :/ */ -static void o2net_sc_connect_completed(struct work_struct *work); -static void o2net_rx_until_empty(struct work_struct *work); -static void o2net_shutdown_sc(struct work_struct *work); -static void o2net_listen_data_ready(struct sock *sk, int bytes); -static void o2net_sc_send_keep_req(struct work_struct *work); -static void o2net_idle_timer(unsigned long data); -static void o2net_sc_postpone_idle(struct o2net_sock_container *sc); -static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc); - -#ifdef CONFIG_DEBUG_FS -static void o2net_init_nst(struct o2net_send_tracking *nst, u32 msgtype, - u32 msgkey, struct task_struct *task, u8 node) -{ - INIT_LIST_HEAD(&nst->st_net_debug_item); - nst->st_task = task; - nst->st_msg_type = msgtype; - nst->st_msg_key = msgkey; - nst->st_node = node; -} - -static inline void o2net_set_nst_sock_time(struct o2net_send_tracking *nst) -{ - nst->st_sock_time = ktime_get(); -} - -static inline void o2net_set_nst_send_time(struct o2net_send_tracking *nst) -{ - nst->st_send_time = ktime_get(); -} - -static inline void o2net_set_nst_status_time(struct o2net_send_tracking *nst) -{ - nst->st_status_time = ktime_get(); -} - -static inline void o2net_set_nst_sock_container(struct o2net_send_tracking *nst, - struct o2net_sock_container *sc) -{ - nst->st_sc = sc; -} - -static inline void o2net_set_nst_msg_id(struct o2net_send_tracking *nst, - u32 msg_id) -{ - nst->st_id = msg_id; -} - -static inline void o2net_set_sock_timer(struct o2net_sock_container *sc) -{ - sc->sc_tv_timer = ktime_get(); -} - -static inline void o2net_set_data_ready_time(struct o2net_sock_container *sc) -{ - sc->sc_tv_data_ready = ktime_get(); -} - -static inline void o2net_set_advance_start_time(struct o2net_sock_container *sc) -{ - sc->sc_tv_advance_start = ktime_get(); -} - -static inline void o2net_set_advance_stop_time(struct o2net_sock_container *sc) -{ - sc->sc_tv_advance_stop = ktime_get(); -} - -static inline void o2net_set_func_start_time(struct o2net_sock_container *sc) -{ - sc->sc_tv_func_start = ktime_get(); -} - -static inline void o2net_set_func_stop_time(struct o2net_sock_container *sc) -{ - sc->sc_tv_func_stop = ktime_get(); -} - -#else /* CONFIG_DEBUG_FS */ -# define o2net_init_nst(a, b, c, d, e) -# define o2net_set_nst_sock_time(a) -# define o2net_set_nst_send_time(a) -# define o2net_set_nst_status_time(a) -# define o2net_set_nst_sock_container(a, b) -# define o2net_set_nst_msg_id(a, b) -# define o2net_set_sock_timer(a) -# define o2net_set_data_ready_time(a) -# define o2net_set_advance_start_time(a) -# define o2net_set_advance_stop_time(a) -# define o2net_set_func_start_time(a) -# define o2net_set_func_stop_time(a) -#endif /* CONFIG_DEBUG_FS */ - -#ifdef CONFIG_OCFS2_FS_STATS -static ktime_t o2net_get_func_run_time(struct o2net_sock_container *sc) -{ - return ktime_sub(sc->sc_tv_func_stop, sc->sc_tv_func_start); -} - -static void o2net_update_send_stats(struct o2net_send_tracking *nst, - struct o2net_sock_container *sc) -{ - sc->sc_tv_status_total = ktime_add(sc->sc_tv_status_total, - ktime_sub(ktime_get(), - nst->st_status_time)); - sc->sc_tv_send_total = ktime_add(sc->sc_tv_send_total, - ktime_sub(nst->st_status_time, - nst->st_send_time)); - sc->sc_tv_acquiry_total = ktime_add(sc->sc_tv_acquiry_total, - ktime_sub(nst->st_send_time, - nst->st_sock_time)); - sc->sc_send_count++; -} - -static void o2net_update_recv_stats(struct o2net_sock_container *sc) -{ - sc->sc_tv_process_total = ktime_add(sc->sc_tv_process_total, - o2net_get_func_run_time(sc)); - sc->sc_recv_count++; -} - -#else - -# define o2net_update_send_stats(a, b) - -# define o2net_update_recv_stats(sc) - -#endif /* CONFIG_OCFS2_FS_STATS */ - -static inline int o2net_reconnect_delay(void) -{ - return o2nm_single_cluster->cl_reconnect_delay_ms; -} - -static inline int o2net_keepalive_delay(void) -{ - return o2nm_single_cluster->cl_keepalive_delay_ms; -} - -static inline int o2net_idle_timeout(void) -{ - return o2nm_single_cluster->cl_idle_timeout_ms; -} - -static inline int o2net_sys_err_to_errno(enum o2net_system_error err) -{ - int trans; - BUG_ON(err >= O2NET_ERR_MAX); - trans = o2net_sys_err_translations[err]; - - /* Just in case we mess up the translation table above */ - BUG_ON(err != O2NET_ERR_NONE && trans == 0); - return trans; -} - -static struct o2net_node * o2net_nn_from_num(u8 node_num) -{ - BUG_ON(node_num >= ARRAY_SIZE(o2net_nodes)); - return &o2net_nodes[node_num]; -} - -static u8 o2net_num_from_nn(struct o2net_node *nn) -{ - BUG_ON(nn == NULL); - return nn - o2net_nodes; -} - -/* ------------------------------------------------------------ */ - -static int o2net_prep_nsw(struct o2net_node *nn, struct o2net_status_wait *nsw) -{ - int ret = 0; - - do { - if (!idr_pre_get(&nn->nn_status_idr, GFP_ATOMIC)) { - ret = -EAGAIN; - break; - } - spin_lock(&nn->nn_lock); - ret = idr_get_new(&nn->nn_status_idr, nsw, &nsw->ns_id); - if (ret == 0) - list_add_tail(&nsw->ns_node_item, - &nn->nn_status_list); - spin_unlock(&nn->nn_lock); - } while (ret == -EAGAIN); - - if (ret == 0) { - init_waitqueue_head(&nsw->ns_wq); - nsw->ns_sys_status = O2NET_ERR_NONE; - nsw->ns_status = 0; - } - - return ret; -} - -static void o2net_complete_nsw_locked(struct o2net_node *nn, - struct o2net_status_wait *nsw, - enum o2net_system_error sys_status, - s32 status) -{ - assert_spin_locked(&nn->nn_lock); - - if (!list_empty(&nsw->ns_node_item)) { - list_del_init(&nsw->ns_node_item); - nsw->ns_sys_status = sys_status; - nsw->ns_status = status; - idr_remove(&nn->nn_status_idr, nsw->ns_id); - wake_up(&nsw->ns_wq); - } -} - -static void o2net_complete_nsw(struct o2net_node *nn, - struct o2net_status_wait *nsw, - u64 id, enum o2net_system_error sys_status, - s32 status) -{ - spin_lock(&nn->nn_lock); - if (nsw == NULL) { - if (id > INT_MAX) - goto out; - - nsw = idr_find(&nn->nn_status_idr, id); - if (nsw == NULL) - goto out; - } - - o2net_complete_nsw_locked(nn, nsw, sys_status, status); - -out: - spin_unlock(&nn->nn_lock); - return; -} - -static void o2net_complete_nodes_nsw(struct o2net_node *nn) -{ - struct o2net_status_wait *nsw, *tmp; - unsigned int num_kills = 0; - - assert_spin_locked(&nn->nn_lock); - - list_for_each_entry_safe(nsw, tmp, &nn->nn_status_list, ns_node_item) { - o2net_complete_nsw_locked(nn, nsw, O2NET_ERR_DIED, 0); - num_kills++; - } - - mlog(0, "completed %d messages for node %u\n", num_kills, - o2net_num_from_nn(nn)); -} - -static int o2net_nsw_completed(struct o2net_node *nn, - struct o2net_status_wait *nsw) -{ - int completed; - spin_lock(&nn->nn_lock); - completed = list_empty(&nsw->ns_node_item); - spin_unlock(&nn->nn_lock); - return completed; -} - -/* ------------------------------------------------------------ */ - -static void sc_kref_release(struct kref *kref) -{ - struct o2net_sock_container *sc = container_of(kref, - struct o2net_sock_container, sc_kref); - BUG_ON(timer_pending(&sc->sc_idle_timeout)); - - sclog(sc, "releasing\n"); - - if (sc->sc_sock) { - sock_release(sc->sc_sock); - sc->sc_sock = NULL; - } - - o2nm_undepend_item(&sc->sc_node->nd_item); - o2nm_node_put(sc->sc_node); - sc->sc_node = NULL; - - o2net_debug_del_sc(sc); - kfree(sc); -} - -static void sc_put(struct o2net_sock_container *sc) -{ - sclog(sc, "put\n"); - kref_put(&sc->sc_kref, sc_kref_release); -} -static void sc_get(struct o2net_sock_container *sc) -{ - sclog(sc, "get\n"); - kref_get(&sc->sc_kref); -} -static struct o2net_sock_container *sc_alloc(struct o2nm_node *node) -{ - struct o2net_sock_container *sc, *ret = NULL; - struct page *page = NULL; - int status = 0; - - page = alloc_page(GFP_NOFS); - sc = kzalloc(sizeof(*sc), GFP_NOFS); - if (sc == NULL || page == NULL) - goto out; - - kref_init(&sc->sc_kref); - o2nm_node_get(node); - sc->sc_node = node; - - /* pin the node item of the remote node */ - status = o2nm_depend_item(&node->nd_item); - if (status) { - mlog_errno(status); - o2nm_node_put(node); - goto out; - } - INIT_WORK(&sc->sc_connect_work, o2net_sc_connect_completed); - INIT_WORK(&sc->sc_rx_work, o2net_rx_until_empty); - INIT_WORK(&sc->sc_shutdown_work, o2net_shutdown_sc); - INIT_DELAYED_WORK(&sc->sc_keepalive_work, o2net_sc_send_keep_req); - - init_timer(&sc->sc_idle_timeout); - sc->sc_idle_timeout.function = o2net_idle_timer; - sc->sc_idle_timeout.data = (unsigned long)sc; - - sclog(sc, "alloced\n"); - - ret = sc; - sc->sc_page = page; - o2net_debug_add_sc(sc); - sc = NULL; - page = NULL; - -out: - if (page) - __free_page(page); - kfree(sc); - - return ret; -} - -/* ------------------------------------------------------------ */ - -static void o2net_sc_queue_work(struct o2net_sock_container *sc, - struct work_struct *work) -{ - sc_get(sc); - if (!queue_work(o2net_wq, work)) - sc_put(sc); -} -static void o2net_sc_queue_delayed_work(struct o2net_sock_container *sc, - struct delayed_work *work, - int delay) -{ - sc_get(sc); - if (!queue_delayed_work(o2net_wq, work, delay)) - sc_put(sc); -} -static void o2net_sc_cancel_delayed_work(struct o2net_sock_container *sc, - struct delayed_work *work) -{ - if (cancel_delayed_work(work)) - sc_put(sc); -} - -static atomic_t o2net_connected_peers = ATOMIC_INIT(0); - -int o2net_num_connected_peers(void) -{ - return atomic_read(&o2net_connected_peers); -} - -static void o2net_set_nn_state(struct o2net_node *nn, - struct o2net_sock_container *sc, - unsigned valid, int err) -{ - int was_valid = nn->nn_sc_valid; - int was_err = nn->nn_persistent_error; - struct o2net_sock_container *old_sc = nn->nn_sc; - - assert_spin_locked(&nn->nn_lock); - - if (old_sc && !sc) - atomic_dec(&o2net_connected_peers); - else if (!old_sc && sc) - atomic_inc(&o2net_connected_peers); - - /* the node num comparison and single connect/accept path should stop - * an non-null sc from being overwritten with another */ - BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc); - mlog_bug_on_msg(err && valid, "err %d valid %u\n", err, valid); - mlog_bug_on_msg(valid && !sc, "valid %u sc %p\n", valid, sc); - - if (was_valid && !valid && err == 0) - err = -ENOTCONN; - - mlog(ML_CONN, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n", - o2net_num_from_nn(nn), nn->nn_sc, sc, nn->nn_sc_valid, valid, - nn->nn_persistent_error, err); - - nn->nn_sc = sc; - nn->nn_sc_valid = valid ? 1 : 0; - nn->nn_persistent_error = err; - - /* mirrors o2net_tx_can_proceed() */ - if (nn->nn_persistent_error || nn->nn_sc_valid) - wake_up(&nn->nn_sc_wq); - - if (!was_err && nn->nn_persistent_error) { - o2quo_conn_err(o2net_num_from_nn(nn)); - queue_delayed_work(o2net_wq, &nn->nn_still_up, - msecs_to_jiffies(O2NET_QUORUM_DELAY_MS)); - } - - if (was_valid && !valid) { - printk(KERN_NOTICE "o2net: No longer connected to " - SC_NODEF_FMT "\n", SC_NODEF_ARGS(old_sc)); - o2net_complete_nodes_nsw(nn); - } - - if (!was_valid && valid) { - o2quo_conn_up(o2net_num_from_nn(nn)); - cancel_delayed_work(&nn->nn_connect_expired); - printk(KERN_NOTICE "o2net: %s " SC_NODEF_FMT "\n", - o2nm_this_node() > sc->sc_node->nd_num ? - "Connected to" : "Accepted connection from", - SC_NODEF_ARGS(sc)); - } - - /* trigger the connecting worker func as long as we're not valid, - * it will back off if it shouldn't connect. This can be called - * from node config teardown and so needs to be careful about - * the work queue actually being up. */ - if (!valid && o2net_wq) { - unsigned long delay; - /* delay if we're within a RECONNECT_DELAY of the - * last attempt */ - delay = (nn->nn_last_connect_attempt + - msecs_to_jiffies(o2net_reconnect_delay())) - - jiffies; - if (delay > msecs_to_jiffies(o2net_reconnect_delay())) - delay = 0; - mlog(ML_CONN, "queueing conn attempt in %lu jiffies\n", delay); - queue_delayed_work(o2net_wq, &nn->nn_connect_work, delay); - - /* - * Delay the expired work after idle timeout. - * - * We might have lots of failed connection attempts that run - * through here but we only cancel the connect_expired work when - * a connection attempt succeeds. So only the first enqueue of - * the connect_expired work will do anything. The rest will see - * that it's already queued and do nothing. - */ - delay += msecs_to_jiffies(o2net_idle_timeout()); - queue_delayed_work(o2net_wq, &nn->nn_connect_expired, delay); - } - - /* keep track of the nn's sc ref for the caller */ - if ((old_sc == NULL) && sc) - sc_get(sc); - if (old_sc && (old_sc != sc)) { - o2net_sc_queue_work(old_sc, &old_sc->sc_shutdown_work); - sc_put(old_sc); - } -} - -/* see o2net_register_callbacks() */ -static void o2net_data_ready(struct sock *sk, int bytes) -{ - void (*ready)(struct sock *sk, int bytes); - - read_lock(&sk->sk_callback_lock); - if (sk->sk_user_data) { - struct o2net_sock_container *sc = sk->sk_user_data; - sclog(sc, "data_ready hit\n"); - o2net_set_data_ready_time(sc); - o2net_sc_queue_work(sc, &sc->sc_rx_work); - ready = sc->sc_data_ready; - } else { - ready = sk->sk_data_ready; - } - read_unlock(&sk->sk_callback_lock); - - ready(sk, bytes); -} - -/* see o2net_register_callbacks() */ -static void o2net_state_change(struct sock *sk) -{ - void (*state_change)(struct sock *sk); - struct o2net_sock_container *sc; - - read_lock(&sk->sk_callback_lock); - sc = sk->sk_user_data; - if (sc == NULL) { - state_change = sk->sk_state_change; - goto out; - } - - sclog(sc, "state_change to %d\n", sk->sk_state); - - state_change = sc->sc_state_change; - - switch(sk->sk_state) { - /* ignore connecting sockets as they make progress */ - case TCP_SYN_SENT: - case TCP_SYN_RECV: - break; - case TCP_ESTABLISHED: - o2net_sc_queue_work(sc, &sc->sc_connect_work); - break; - default: - printk(KERN_INFO "o2net: Connection to " SC_NODEF_FMT - " shutdown, state %d\n", - SC_NODEF_ARGS(sc), sk->sk_state); - o2net_sc_queue_work(sc, &sc->sc_shutdown_work); - break; - } -out: - read_unlock(&sk->sk_callback_lock); - state_change(sk); -} - -/* - * we register callbacks so we can queue work on events before calling - * the original callbacks. our callbacks our careful to test user_data - * to discover when they've reaced with o2net_unregister_callbacks(). - */ -static void o2net_register_callbacks(struct sock *sk, - struct o2net_sock_container *sc) -{ - write_lock_bh(&sk->sk_callback_lock); - - /* accepted sockets inherit the old listen socket data ready */ - if (sk->sk_data_ready == o2net_listen_data_ready) { - sk->sk_data_ready = sk->sk_user_data; - sk->sk_user_data = NULL; - } - - BUG_ON(sk->sk_user_data != NULL); - sk->sk_user_data = sc; - sc_get(sc); - - sc->sc_data_ready = sk->sk_data_ready; - sc->sc_state_change = sk->sk_state_change; - sk->sk_data_ready = o2net_data_ready; - sk->sk_state_change = o2net_state_change; - - mutex_init(&sc->sc_send_lock); - - write_unlock_bh(&sk->sk_callback_lock); -} - -static int o2net_unregister_callbacks(struct sock *sk, - struct o2net_sock_container *sc) -{ - int ret = 0; - - write_lock_bh(&sk->sk_callback_lock); - if (sk->sk_user_data == sc) { - ret = 1; - sk->sk_user_data = NULL; - sk->sk_data_ready = sc->sc_data_ready; - sk->sk_state_change = sc->sc_state_change; - } - write_unlock_bh(&sk->sk_callback_lock); - - return ret; -} - -/* - * this is a little helper that is called by callers who have seen a problem - * with an sc and want to detach it from the nn if someone already hasn't beat - * them to it. if an error is given then the shutdown will be persistent - * and pending transmits will be canceled. - */ -static void o2net_ensure_shutdown(struct o2net_node *nn, - struct o2net_sock_container *sc, - int err) -{ - spin_lock(&nn->nn_lock); - if (nn->nn_sc == sc) - o2net_set_nn_state(nn, NULL, 0, err); - spin_unlock(&nn->nn_lock); -} - -/* - * This work queue function performs the blocking parts of socket shutdown. A - * few paths lead here. set_nn_state will trigger this callback if it sees an - * sc detached from the nn. state_change will also trigger this callback - * directly when it sees errors. In that case we need to call set_nn_state - * ourselves as state_change couldn't get the nn_lock and call set_nn_state - * itself. - */ -static void o2net_shutdown_sc(struct work_struct *work) -{ - struct o2net_sock_container *sc = - container_of(work, struct o2net_sock_container, - sc_shutdown_work); - struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); - - sclog(sc, "shutting down\n"); - - /* drop the callbacks ref and call shutdown only once */ - if (o2net_unregister_callbacks(sc->sc_sock->sk, sc)) { - /* we shouldn't flush as we're in the thread, the - * races with pending sc work structs are harmless */ - del_timer_sync(&sc->sc_idle_timeout); - o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); - sc_put(sc); - kernel_sock_shutdown(sc->sc_sock, SHUT_RDWR); - } - - /* not fatal so failed connects before the other guy has our - * heartbeat can be retried */ - o2net_ensure_shutdown(nn, sc, 0); - sc_put(sc); -} - -/* ------------------------------------------------------------ */ - -static int o2net_handler_cmp(struct o2net_msg_handler *nmh, u32 msg_type, - u32 key) -{ - int ret = memcmp(&nmh->nh_key, &key, sizeof(key)); - - if (ret == 0) - ret = memcmp(&nmh->nh_msg_type, &msg_type, sizeof(msg_type)); - - return ret; -} - -static struct o2net_msg_handler * -o2net_handler_tree_lookup(u32 msg_type, u32 key, struct rb_node ***ret_p, - struct rb_node **ret_parent) -{ - struct rb_node **p = &o2net_handler_tree.rb_node; - struct rb_node *parent = NULL; - struct o2net_msg_handler *nmh, *ret = NULL; - int cmp; - - while (*p) { - parent = *p; - nmh = rb_entry(parent, struct o2net_msg_handler, nh_node); - cmp = o2net_handler_cmp(nmh, msg_type, key); - - if (cmp < 0) - p = &(*p)->rb_left; - else if (cmp > 0) - p = &(*p)->rb_right; - else { - ret = nmh; - break; - } - } - - if (ret_p != NULL) - *ret_p = p; - if (ret_parent != NULL) - *ret_parent = parent; - - return ret; -} - -static void o2net_handler_kref_release(struct kref *kref) -{ - struct o2net_msg_handler *nmh; - nmh = container_of(kref, struct o2net_msg_handler, nh_kref); - - kfree(nmh); -} - -static void o2net_handler_put(struct o2net_msg_handler *nmh) -{ - kref_put(&nmh->nh_kref, o2net_handler_kref_release); -} - -/* max_len is protection for the handler func. incoming messages won't - * be given to the handler if their payload is longer than the max. */ -int o2net_register_handler(u32 msg_type, u32 key, u32 max_len, - o2net_msg_handler_func *func, void *data, - o2net_post_msg_handler_func *post_func, - struct list_head *unreg_list) -{ - struct o2net_msg_handler *nmh = NULL; - struct rb_node **p, *parent; - int ret = 0; - - if (max_len > O2NET_MAX_PAYLOAD_BYTES) { - mlog(0, "max_len for message handler out of range: %u\n", - max_len); - ret = -EINVAL; - goto out; - } - - if (!msg_type) { - mlog(0, "no message type provided: %u, %p\n", msg_type, func); - ret = -EINVAL; - goto out; - - } - if (!func) { - mlog(0, "no message handler provided: %u, %p\n", - msg_type, func); - ret = -EINVAL; - goto out; - } - - nmh = kzalloc(sizeof(struct o2net_msg_handler), GFP_NOFS); - if (nmh == NULL) { - ret = -ENOMEM; - goto out; - } - - nmh->nh_func = func; - nmh->nh_func_data = data; - nmh->nh_post_func = post_func; - nmh->nh_msg_type = msg_type; - nmh->nh_max_len = max_len; - nmh->nh_key = key; - /* the tree and list get this ref.. they're both removed in - * unregister when this ref is dropped */ - kref_init(&nmh->nh_kref); - INIT_LIST_HEAD(&nmh->nh_unregister_item); - - write_lock(&o2net_handler_lock); - if (o2net_handler_tree_lookup(msg_type, key, &p, &parent)) - ret = -EEXIST; - else { - rb_link_node(&nmh->nh_node, parent, p); - rb_insert_color(&nmh->nh_node, &o2net_handler_tree); - list_add_tail(&nmh->nh_unregister_item, unreg_list); - - mlog(ML_TCP, "registered handler func %p type %u key %08x\n", - func, msg_type, key); - /* we've had some trouble with handlers seemingly vanishing. */ - mlog_bug_on_msg(o2net_handler_tree_lookup(msg_type, key, &p, - &parent) == NULL, - "couldn't find handler we *just* registerd " - "for type %u key %08x\n", msg_type, key); - } - write_unlock(&o2net_handler_lock); - if (ret) - goto out; - -out: - if (ret) - kfree(nmh); - - return ret; -} -EXPORT_SYMBOL_GPL(o2net_register_handler); - -void o2net_unregister_handler_list(struct list_head *list) -{ - struct o2net_msg_handler *nmh, *n; - - write_lock(&o2net_handler_lock); - list_for_each_entry_safe(nmh, n, list, nh_unregister_item) { - mlog(ML_TCP, "unregistering handler func %p type %u key %08x\n", - nmh->nh_func, nmh->nh_msg_type, nmh->nh_key); - rb_erase(&nmh->nh_node, &o2net_handler_tree); - list_del_init(&nmh->nh_unregister_item); - kref_put(&nmh->nh_kref, o2net_handler_kref_release); - } - write_unlock(&o2net_handler_lock); -} -EXPORT_SYMBOL_GPL(o2net_unregister_handler_list); - -static struct o2net_msg_handler *o2net_handler_get(u32 msg_type, u32 key) -{ - struct o2net_msg_handler *nmh; - - read_lock(&o2net_handler_lock); - nmh = o2net_handler_tree_lookup(msg_type, key, NULL, NULL); - if (nmh) - kref_get(&nmh->nh_kref); - read_unlock(&o2net_handler_lock); - - return nmh; -} - -/* ------------------------------------------------------------ */ - -static int o2net_recv_tcp_msg(struct socket *sock, void *data, size_t len) -{ - int ret; - mm_segment_t oldfs; - struct kvec vec = { - .iov_len = len, - .iov_base = data, - }; - struct msghdr msg = { - .msg_iovlen = 1, - .msg_iov = (struct iovec *)&vec, - .msg_flags = MSG_DONTWAIT, - }; - - oldfs = get_fs(); - set_fs(get_ds()); - ret = sock_recvmsg(sock, &msg, len, msg.msg_flags); - set_fs(oldfs); - - return ret; -} - -static int o2net_send_tcp_msg(struct socket *sock, struct kvec *vec, - size_t veclen, size_t total) -{ - int ret; - mm_segment_t oldfs; - struct msghdr msg = { - .msg_iov = (struct iovec *)vec, - .msg_iovlen = veclen, - }; - - if (sock == NULL) { - ret = -EINVAL; - goto out; - } - - oldfs = get_fs(); - set_fs(get_ds()); - ret = sock_sendmsg(sock, &msg, total); - set_fs(oldfs); - if (ret != total) { - mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret, - total); - if (ret >= 0) - ret = -EPIPE; /* should be smarter, I bet */ - goto out; - } - - ret = 0; -out: - if (ret < 0) - mlog(0, "returning error: %d\n", ret); - return ret; -} - -static void o2net_sendpage(struct o2net_sock_container *sc, - void *kmalloced_virt, - size_t size) -{ - struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); - ssize_t ret; - - while (1) { - mutex_lock(&sc->sc_send_lock); - ret = sc->sc_sock->ops->sendpage(sc->sc_sock, - virt_to_page(kmalloced_virt), - (long)kmalloced_virt & ~PAGE_MASK, - size, MSG_DONTWAIT); - mutex_unlock(&sc->sc_send_lock); - if (ret == size) - break; - if (ret == (ssize_t)-EAGAIN) { - mlog(0, "sendpage of size %zu to " SC_NODEF_FMT - " returned EAGAIN\n", size, SC_NODEF_ARGS(sc)); - cond_resched(); - continue; - } - mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT - " failed with %zd\n", size, SC_NODEF_ARGS(sc), ret); - o2net_ensure_shutdown(nn, sc, 0); - break; - } -} - -static void o2net_init_msg(struct o2net_msg *msg, u16 data_len, u16 msg_type, u32 key) -{ - memset(msg, 0, sizeof(struct o2net_msg)); - msg->magic = cpu_to_be16(O2NET_MSG_MAGIC); - msg->data_len = cpu_to_be16(data_len); - msg->msg_type = cpu_to_be16(msg_type); - msg->sys_status = cpu_to_be32(O2NET_ERR_NONE); - msg->status = 0; - msg->key = cpu_to_be32(key); -} - -static int o2net_tx_can_proceed(struct o2net_node *nn, - struct o2net_sock_container **sc_ret, - int *error) -{ - int ret = 0; - - spin_lock(&nn->nn_lock); - if (nn->nn_persistent_error) { - ret = 1; - *sc_ret = NULL; - *error = nn->nn_persistent_error; - } else if (nn->nn_sc_valid) { - kref_get(&nn->nn_sc->sc_kref); - - ret = 1; - *sc_ret = nn->nn_sc; - *error = 0; - } - spin_unlock(&nn->nn_lock); - - return ret; -} - -/* Get a map of all nodes to which this node is currently connected to */ -void o2net_fill_node_map(unsigned long *map, unsigned bytes) -{ - struct o2net_sock_container *sc; - int node, ret; - - BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long))); - - memset(map, 0, bytes); - for (node = 0; node < O2NM_MAX_NODES; ++node) { - o2net_tx_can_proceed(o2net_nn_from_num(node), &sc, &ret); - if (!ret) { - set_bit(node, map); - sc_put(sc); - } - } -} -EXPORT_SYMBOL_GPL(o2net_fill_node_map); - -int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec, - size_t caller_veclen, u8 target_node, int *status) -{ - int ret = 0; - struct o2net_msg *msg = NULL; - size_t veclen, caller_bytes = 0; - struct kvec *vec = NULL; - struct o2net_sock_container *sc = NULL; - struct o2net_node *nn = o2net_nn_from_num(target_node); - struct o2net_status_wait nsw = { - .ns_node_item = LIST_HEAD_INIT(nsw.ns_node_item), - }; - struct o2net_send_tracking nst; - - o2net_init_nst(&nst, msg_type, key, current, target_node); - - if (o2net_wq == NULL) { - mlog(0, "attempt to tx without o2netd running\n"); - ret = -ESRCH; - goto out; - } - - if (caller_veclen == 0) { - mlog(0, "bad kvec array length\n"); - ret = -EINVAL; - goto out; - } - - caller_bytes = iov_length((struct iovec *)caller_vec, caller_veclen); - if (caller_bytes > O2NET_MAX_PAYLOAD_BYTES) { - mlog(0, "total payload len %zu too large\n", caller_bytes); - ret = -EINVAL; - goto out; - } - - if (target_node == o2nm_this_node()) { - ret = -ELOOP; - goto out; - } - - o2net_debug_add_nst(&nst); - - o2net_set_nst_sock_time(&nst); - - wait_event(nn->nn_sc_wq, o2net_tx_can_proceed(nn, &sc, &ret)); - if (ret) - goto out; - - o2net_set_nst_sock_container(&nst, sc); - - veclen = caller_veclen + 1; - vec = kmalloc(sizeof(struct kvec) * veclen, GFP_ATOMIC); - if (vec == NULL) { - mlog(0, "failed to %zu element kvec!\n", veclen); - ret = -ENOMEM; - goto out; - } - - msg = kmalloc(sizeof(struct o2net_msg), GFP_ATOMIC); - if (!msg) { - mlog(0, "failed to allocate a o2net_msg!\n"); - ret = -ENOMEM; - goto out; - } - - o2net_init_msg(msg, caller_bytes, msg_type, key); - - vec[0].iov_len = sizeof(struct o2net_msg); - vec[0].iov_base = msg; - memcpy(&vec[1], caller_vec, caller_veclen * sizeof(struct kvec)); - - ret = o2net_prep_nsw(nn, &nsw); - if (ret) - goto out; - - msg->msg_num = cpu_to_be32(nsw.ns_id); - o2net_set_nst_msg_id(&nst, nsw.ns_id); - - o2net_set_nst_send_time(&nst); - - /* finally, convert the message header to network byte-order - * and send */ - mutex_lock(&sc->sc_send_lock); - ret = o2net_send_tcp_msg(sc->sc_sock, vec, veclen, - sizeof(struct o2net_msg) + caller_bytes); - mutex_unlock(&sc->sc_send_lock); - msglog(msg, "sending returned %d\n", ret); - if (ret < 0) { - mlog(0, "error returned from o2net_send_tcp_msg=%d\n", ret); - goto out; - } - - /* wait on other node's handler */ - o2net_set_nst_status_time(&nst); - wait_event(nsw.ns_wq, o2net_nsw_completed(nn, &nsw)); - - o2net_update_send_stats(&nst, sc); - - /* Note that we avoid overwriting the callers status return - * variable if a system error was reported on the other - * side. Callers beware. */ - ret = o2net_sys_err_to_errno(nsw.ns_sys_status); - if (status && !ret) - *status = nsw.ns_status; - - mlog(0, "woken, returning system status %d, user status %d\n", - ret, nsw.ns_status); -out: - o2net_debug_del_nst(&nst); /* must be before dropping sc and node */ - if (sc) - sc_put(sc); - if (vec) - kfree(vec); - if (msg) - kfree(msg); - o2net_complete_nsw(nn, &nsw, 0, 0, 0); - return ret; -} -EXPORT_SYMBOL_GPL(o2net_send_message_vec); - -int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len, - u8 target_node, int *status) -{ - struct kvec vec = { - .iov_base = data, - .iov_len = len, - }; - return o2net_send_message_vec(msg_type, key, &vec, 1, - target_node, status); -} -EXPORT_SYMBOL_GPL(o2net_send_message); - -static int o2net_send_status_magic(struct socket *sock, struct o2net_msg *hdr, - enum o2net_system_error syserr, int err) -{ - struct kvec vec = { - .iov_base = hdr, - .iov_len = sizeof(struct o2net_msg), - }; - - BUG_ON(syserr >= O2NET_ERR_MAX); - - /* leave other fields intact from the incoming message, msg_num - * in particular */ - hdr->sys_status = cpu_to_be32(syserr); - hdr->status = cpu_to_be32(err); - hdr->magic = cpu_to_be16(O2NET_MSG_STATUS_MAGIC); // twiddle the magic - hdr->data_len = 0; - - msglog(hdr, "about to send status magic %d\n", err); - /* hdr has been in host byteorder this whole time */ - return o2net_send_tcp_msg(sock, &vec, 1, sizeof(struct o2net_msg)); -} - -/* this returns -errno if the header was unknown or too large, etc. - * after this is called the buffer us reused for the next message */ -static int o2net_process_message(struct o2net_sock_container *sc, - struct o2net_msg *hdr) -{ - struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); - int ret = 0, handler_status; - enum o2net_system_error syserr; - struct o2net_msg_handler *nmh = NULL; - void *ret_data = NULL; - - msglog(hdr, "processing message\n"); - - o2net_sc_postpone_idle(sc); - - switch(be16_to_cpu(hdr->magic)) { - case O2NET_MSG_STATUS_MAGIC: - /* special type for returning message status */ - o2net_complete_nsw(nn, NULL, - be32_to_cpu(hdr->msg_num), - be32_to_cpu(hdr->sys_status), - be32_to_cpu(hdr->status)); - goto out; - case O2NET_MSG_KEEP_REQ_MAGIC: - o2net_sendpage(sc, o2net_keep_resp, - sizeof(*o2net_keep_resp)); - goto out; - case O2NET_MSG_KEEP_RESP_MAGIC: - goto out; - case O2NET_MSG_MAGIC: - break; - default: - msglog(hdr, "bad magic\n"); - ret = -EINVAL; - goto out; - break; - } - - /* find a handler for it */ - handler_status = 0; - nmh = o2net_handler_get(be16_to_cpu(hdr->msg_type), - be32_to_cpu(hdr->key)); - if (!nmh) { - mlog(ML_TCP, "couldn't find handler for type %u key %08x\n", - be16_to_cpu(hdr->msg_type), be32_to_cpu(hdr->key)); - syserr = O2NET_ERR_NO_HNDLR; - goto out_respond; - } - - syserr = O2NET_ERR_NONE; - - if (be16_to_cpu(hdr->data_len) > nmh->nh_max_len) - syserr = O2NET_ERR_OVERFLOW; - - if (syserr != O2NET_ERR_NONE) - goto out_respond; - - o2net_set_func_start_time(sc); - sc->sc_msg_key = be32_to_cpu(hdr->key); - sc->sc_msg_type = be16_to_cpu(hdr->msg_type); - handler_status = (nmh->nh_func)(hdr, sizeof(struct o2net_msg) + - be16_to_cpu(hdr->data_len), - nmh->nh_func_data, &ret_data); - o2net_set_func_stop_time(sc); - - o2net_update_recv_stats(sc); - -out_respond: - /* this destroys the hdr, so don't use it after this */ - mutex_lock(&sc->sc_send_lock); - ret = o2net_send_status_magic(sc->sc_sock, hdr, syserr, - handler_status); - mutex_unlock(&sc->sc_send_lock); - hdr = NULL; - mlog(0, "sending handler status %d, syserr %d returned %d\n", - handler_status, syserr, ret); - - if (nmh) { - BUG_ON(ret_data != NULL && nmh->nh_post_func == NULL); - if (nmh->nh_post_func) - (nmh->nh_post_func)(handler_status, nmh->nh_func_data, - ret_data); - } - -out: - if (nmh) - o2net_handler_put(nmh); - return ret; -} - -static int o2net_check_handshake(struct o2net_sock_container *sc) -{ - struct o2net_handshake *hand = page_address(sc->sc_page); - struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); - - if (hand->protocol_version != cpu_to_be64(O2NET_PROTOCOL_VERSION)) { - printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " Advertised net " - "protocol version %llu but %llu is required. " - "Disconnecting.\n", SC_NODEF_ARGS(sc), - (unsigned long long)be64_to_cpu(hand->protocol_version), - O2NET_PROTOCOL_VERSION); - - /* don't bother reconnecting if its the wrong version. */ - o2net_ensure_shutdown(nn, sc, -ENOTCONN); - return -1; - } - - /* - * Ensure timeouts are consistent with other nodes, otherwise - * we can end up with one node thinking that the other must be down, - * but isn't. This can ultimately cause corruption. - */ - if (be32_to_cpu(hand->o2net_idle_timeout_ms) != - o2net_idle_timeout()) { - printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a network " - "idle timeout of %u ms, but we use %u ms locally. " - "Disconnecting.\n", SC_NODEF_ARGS(sc), - be32_to_cpu(hand->o2net_idle_timeout_ms), - o2net_idle_timeout()); - o2net_ensure_shutdown(nn, sc, -ENOTCONN); - return -1; - } - - if (be32_to_cpu(hand->o2net_keepalive_delay_ms) != - o2net_keepalive_delay()) { - printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a keepalive " - "delay of %u ms, but we use %u ms locally. " - "Disconnecting.\n", SC_NODEF_ARGS(sc), - be32_to_cpu(hand->o2net_keepalive_delay_ms), - o2net_keepalive_delay()); - o2net_ensure_shutdown(nn, sc, -ENOTCONN); - return -1; - } - - if (be32_to_cpu(hand->o2hb_heartbeat_timeout_ms) != - O2HB_MAX_WRITE_TIMEOUT_MS) { - printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a heartbeat " - "timeout of %u ms, but we use %u ms locally. " - "Disconnecting.\n", SC_NODEF_ARGS(sc), - be32_to_cpu(hand->o2hb_heartbeat_timeout_ms), - O2HB_MAX_WRITE_TIMEOUT_MS); - o2net_ensure_shutdown(nn, sc, -ENOTCONN); - return -1; - } - - sc->sc_handshake_ok = 1; - - spin_lock(&nn->nn_lock); - /* set valid and queue the idle timers only if it hasn't been - * shut down already */ - if (nn->nn_sc == sc) { - o2net_sc_reset_idle_timer(sc); - atomic_set(&nn->nn_timeout, 0); - o2net_set_nn_state(nn, sc, 1, 0); - } - spin_unlock(&nn->nn_lock); - - /* shift everything up as though it wasn't there */ - sc->sc_page_off -= sizeof(struct o2net_handshake); - if (sc->sc_page_off) - memmove(hand, hand + 1, sc->sc_page_off); - - return 0; -} - -/* this demuxes the queued rx bytes into header or payload bits and calls - * handlers as each full message is read off the socket. it returns -error, - * == 0 eof, or > 0 for progress made.*/ -static int o2net_advance_rx(struct o2net_sock_container *sc) -{ - struct o2net_msg *hdr; - int ret = 0; - void *data; - size_t datalen; - - sclog(sc, "receiving\n"); - o2net_set_advance_start_time(sc); - - if (unlikely(sc->sc_handshake_ok == 0)) { - if(sc->sc_page_off < sizeof(struct o2net_handshake)) { - data = page_address(sc->sc_page) + sc->sc_page_off; - datalen = sizeof(struct o2net_handshake) - sc->sc_page_off; - ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); - if (ret > 0) - sc->sc_page_off += ret; - } - - if (sc->sc_page_off == sizeof(struct o2net_handshake)) { - o2net_check_handshake(sc); - if (unlikely(sc->sc_handshake_ok == 0)) - ret = -EPROTO; - } - goto out; - } - - /* do we need more header? */ - if (sc->sc_page_off < sizeof(struct o2net_msg)) { - data = page_address(sc->sc_page) + sc->sc_page_off; - datalen = sizeof(struct o2net_msg) - sc->sc_page_off; - ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); - if (ret > 0) { - sc->sc_page_off += ret; - /* only swab incoming here.. we can - * only get here once as we cross from - * being under to over */ - if (sc->sc_page_off == sizeof(struct o2net_msg)) { - hdr = page_address(sc->sc_page); - if (be16_to_cpu(hdr->data_len) > - O2NET_MAX_PAYLOAD_BYTES) - ret = -EOVERFLOW; - } - } - if (ret <= 0) - goto out; - } - - if (sc->sc_page_off < sizeof(struct o2net_msg)) { - /* oof, still don't have a header */ - goto out; - } - - /* this was swabbed above when we first read it */ - hdr = page_address(sc->sc_page); - - msglog(hdr, "at page_off %zu\n", sc->sc_page_off); - - /* do we need more payload? */ - if (sc->sc_page_off - sizeof(struct o2net_msg) < be16_to_cpu(hdr->data_len)) { - /* need more payload */ - data = page_address(sc->sc_page) + sc->sc_page_off; - datalen = (sizeof(struct o2net_msg) + be16_to_cpu(hdr->data_len)) - - sc->sc_page_off; - ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); - if (ret > 0) - sc->sc_page_off += ret; - if (ret <= 0) - goto out; - } - - if (sc->sc_page_off - sizeof(struct o2net_msg) == be16_to_cpu(hdr->data_len)) { - /* we can only get here once, the first time we read - * the payload.. so set ret to progress if the handler - * works out. after calling this the message is toast */ - ret = o2net_process_message(sc, hdr); - if (ret == 0) - ret = 1; - sc->sc_page_off = 0; - } - -out: - sclog(sc, "ret = %d\n", ret); - o2net_set_advance_stop_time(sc); - return ret; -} - -/* this work func is triggerd by data ready. it reads until it can read no - * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing - * our work the work struct will be marked and we'll be called again. */ -static void o2net_rx_until_empty(struct work_struct *work) -{ - struct o2net_sock_container *sc = - container_of(work, struct o2net_sock_container, sc_rx_work); - int ret; - - do { - ret = o2net_advance_rx(sc); - } while (ret > 0); - - if (ret <= 0 && ret != -EAGAIN) { - struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); - sclog(sc, "saw error %d, closing\n", ret); - /* not permanent so read failed handshake can retry */ - o2net_ensure_shutdown(nn, sc, 0); - } - - sc_put(sc); -} - -static int o2net_set_nodelay(struct socket *sock) -{ - int ret, val = 1; - mm_segment_t oldfs; - - oldfs = get_fs(); - set_fs(KERNEL_DS); - - /* - * Dear unsuspecting programmer, - * - * Don't use sock_setsockopt() for SOL_TCP. It doesn't check its level - * argument and assumes SOL_SOCKET so, say, your TCP_NODELAY will - * silently turn into SO_DEBUG. - * - * Yours, - * Keeper of hilariously fragile interfaces. - */ - ret = sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY, - (char __user *)&val, sizeof(val)); - - set_fs(oldfs); - return ret; -} - -static void o2net_initialize_handshake(void) -{ - o2net_hand->o2hb_heartbeat_timeout_ms = cpu_to_be32( - O2HB_MAX_WRITE_TIMEOUT_MS); - o2net_hand->o2net_idle_timeout_ms = cpu_to_be32(o2net_idle_timeout()); - o2net_hand->o2net_keepalive_delay_ms = cpu_to_be32( - o2net_keepalive_delay()); - o2net_hand->o2net_reconnect_delay_ms = cpu_to_be32( - o2net_reconnect_delay()); -} - -/* ------------------------------------------------------------ */ - -/* called when a connect completes and after a sock is accepted. the - * rx path will see the response and mark the sc valid */ -static void o2net_sc_connect_completed(struct work_struct *work) -{ - struct o2net_sock_container *sc = - container_of(work, struct o2net_sock_container, - sc_connect_work); - - mlog(ML_MSG, "sc sending handshake with ver %llu id %llx\n", - (unsigned long long)O2NET_PROTOCOL_VERSION, - (unsigned long long)be64_to_cpu(o2net_hand->connector_id)); - - o2net_initialize_handshake(); - o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand)); - sc_put(sc); -} - -/* this is called as a work_struct func. */ -static void o2net_sc_send_keep_req(struct work_struct *work) -{ - struct o2net_sock_container *sc = - container_of(work, struct o2net_sock_container, - sc_keepalive_work.work); - - o2net_sendpage(sc, o2net_keep_req, sizeof(*o2net_keep_req)); - sc_put(sc); -} - -/* socket shutdown does a del_timer_sync against this as it tears down. - * we can't start this timer until we've got to the point in sc buildup - * where shutdown is going to be involved */ -static void o2net_idle_timer(unsigned long data) -{ - struct o2net_sock_container *sc = (struct o2net_sock_container *)data; - struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); -#ifdef CONFIG_DEBUG_FS - unsigned long msecs = ktime_to_ms(ktime_get()) - - ktime_to_ms(sc->sc_tv_timer); -#else - unsigned long msecs = o2net_idle_timeout(); -#endif - - printk(KERN_NOTICE "o2net: Connection to " SC_NODEF_FMT " has been " - "idle for %lu.%lu secs, shutting it down.\n", SC_NODEF_ARGS(sc), - msecs / 1000, msecs % 1000); - - /* - * Initialize the nn_timeout so that the next connection attempt - * will continue in o2net_start_connect. - */ - atomic_set(&nn->nn_timeout, 1); - - o2net_sc_queue_work(sc, &sc->sc_shutdown_work); -} - -static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc) -{ - o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); - o2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work, - msecs_to_jiffies(o2net_keepalive_delay())); - o2net_set_sock_timer(sc); - mod_timer(&sc->sc_idle_timeout, - jiffies + msecs_to_jiffies(o2net_idle_timeout())); -} - -static void o2net_sc_postpone_idle(struct o2net_sock_container *sc) -{ - /* Only push out an existing timer */ - if (timer_pending(&sc->sc_idle_timeout)) - o2net_sc_reset_idle_timer(sc); -} - -/* this work func is kicked whenever a path sets the nn state which doesn't - * have valid set. This includes seeing hb come up, losing a connection, - * having a connect attempt fail, etc. This centralizes the logic which decides - * if a connect attempt should be made or if we should give up and all future - * transmit attempts should fail */ -static void o2net_start_connect(struct work_struct *work) -{ - struct o2net_node *nn = - container_of(work, struct o2net_node, nn_connect_work.work); - struct o2net_sock_container *sc = NULL; - struct o2nm_node *node = NULL, *mynode = NULL; - struct socket *sock = NULL; - struct sockaddr_in myaddr = {0, }, remoteaddr = {0, }; - int ret = 0, stop; - unsigned int timeout; - - /* if we're greater we initiate tx, otherwise we accept */ - if (o2nm_this_node() <= o2net_num_from_nn(nn)) - goto out; - - /* watch for racing with tearing a node down */ - node = o2nm_get_node_by_num(o2net_num_from_nn(nn)); - if (node == NULL) { - ret = 0; - goto out; - } - - mynode = o2nm_get_node_by_num(o2nm_this_node()); - if (mynode == NULL) { - ret = 0; - goto out; - } - - spin_lock(&nn->nn_lock); - /* - * see if we already have one pending or have given up. - * For nn_timeout, it is set when we close the connection - * because of the idle time out. So it means that we have - * at least connected to that node successfully once, - * now try to connect to it again. - */ - timeout = atomic_read(&nn->nn_timeout); - stop = (nn->nn_sc || - (nn->nn_persistent_error && - (nn->nn_persistent_error != -ENOTCONN || timeout == 0))); - spin_unlock(&nn->nn_lock); - if (stop) - goto out; - - nn->nn_last_connect_attempt = jiffies; - - sc = sc_alloc(node); - if (sc == NULL) { - mlog(0, "couldn't allocate sc\n"); - ret = -ENOMEM; - goto out; - } - - ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); - if (ret < 0) { - mlog(0, "can't create socket: %d\n", ret); - goto out; - } - sc->sc_sock = sock; /* freed by sc_kref_release */ - - sock->sk->sk_allocation = GFP_ATOMIC; - - myaddr.sin_family = AF_INET; - myaddr.sin_addr.s_addr = mynode->nd_ipv4_address; - myaddr.sin_port = htons(0); /* any port */ - - ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr, - sizeof(myaddr)); - if (ret) { - mlog(ML_ERROR, "bind failed with %d at address %pI4\n", - ret, &mynode->nd_ipv4_address); - goto out; - } - - ret = o2net_set_nodelay(sc->sc_sock); - if (ret) { - mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); - goto out; - } - - o2net_register_callbacks(sc->sc_sock->sk, sc); - - spin_lock(&nn->nn_lock); - /* handshake completion will set nn->nn_sc_valid */ - o2net_set_nn_state(nn, sc, 0, 0); - spin_unlock(&nn->nn_lock); - - remoteaddr.sin_family = AF_INET; - remoteaddr.sin_addr.s_addr = node->nd_ipv4_address; - remoteaddr.sin_port = node->nd_ipv4_port; - - ret = sc->sc_sock->ops->connect(sc->sc_sock, - (struct sockaddr *)&remoteaddr, - sizeof(remoteaddr), - O_NONBLOCK); - if (ret == -EINPROGRESS) - ret = 0; - -out: - if (ret) { - printk(KERN_NOTICE "o2net: Connect attempt to " SC_NODEF_FMT - " failed with errno %d\n", SC_NODEF_ARGS(sc), ret); - /* 0 err so that another will be queued and attempted - * from set_nn_state */ - if (sc) - o2net_ensure_shutdown(nn, sc, 0); - } - if (sc) - sc_put(sc); - if (node) - o2nm_node_put(node); - if (mynode) - o2nm_node_put(mynode); - - return; -} - -static void o2net_connect_expired(struct work_struct *work) -{ - struct o2net_node *nn = - container_of(work, struct o2net_node, nn_connect_expired.work); - - spin_lock(&nn->nn_lock); - if (!nn->nn_sc_valid) { - printk(KERN_NOTICE "o2net: No connection established with " - "node %u after %u.%u seconds, giving up.\n", - o2net_num_from_nn(nn), - o2net_idle_timeout() / 1000, - o2net_idle_timeout() % 1000); - - o2net_set_nn_state(nn, NULL, 0, -ENOTCONN); - } - spin_unlock(&nn->nn_lock); -} - -static void o2net_still_up(struct work_struct *work) -{ - struct o2net_node *nn = - container_of(work, struct o2net_node, nn_still_up.work); - - o2quo_hb_still_up(o2net_num_from_nn(nn)); -} - -/* ------------------------------------------------------------ */ - -void o2net_disconnect_node(struct o2nm_node *node) -{ - struct o2net_node *nn = o2net_nn_from_num(node->nd_num); - - /* don't reconnect until it's heartbeating again */ - spin_lock(&nn->nn_lock); - atomic_set(&nn->nn_timeout, 0); - o2net_set_nn_state(nn, NULL, 0, -ENOTCONN); - spin_unlock(&nn->nn_lock); - - if (o2net_wq) { - cancel_delayed_work(&nn->nn_connect_expired); - cancel_delayed_work(&nn->nn_connect_work); - cancel_delayed_work(&nn->nn_still_up); - flush_workqueue(o2net_wq); - } -} - -static void o2net_hb_node_down_cb(struct o2nm_node *node, int node_num, - void *data) -{ - o2quo_hb_down(node_num); - - if (!node) - return; - - if (node_num != o2nm_this_node()) - o2net_disconnect_node(node); - - BUG_ON(atomic_read(&o2net_connected_peers) < 0); -} - -static void o2net_hb_node_up_cb(struct o2nm_node *node, int node_num, - void *data) -{ - struct o2net_node *nn = o2net_nn_from_num(node_num); - - o2quo_hb_up(node_num); - - BUG_ON(!node); - - /* ensure an immediate connect attempt */ - nn->nn_last_connect_attempt = jiffies - - (msecs_to_jiffies(o2net_reconnect_delay()) + 1); - - if (node_num != o2nm_this_node()) { - /* believe it or not, accept and node hearbeating testing - * can succeed for this node before we got here.. so - * only use set_nn_state to clear the persistent error - * if that hasn't already happened */ - spin_lock(&nn->nn_lock); - atomic_set(&nn->nn_timeout, 0); - if (nn->nn_persistent_error) - o2net_set_nn_state(nn, NULL, 0, 0); - spin_unlock(&nn->nn_lock); - } -} - -void o2net_unregister_hb_callbacks(void) -{ - o2hb_unregister_callback(NULL, &o2net_hb_up); - o2hb_unregister_callback(NULL, &o2net_hb_down); -} - -int o2net_register_hb_callbacks(void) -{ - int ret; - - o2hb_setup_callback(&o2net_hb_down, O2HB_NODE_DOWN_CB, - o2net_hb_node_down_cb, NULL, O2NET_HB_PRI); - o2hb_setup_callback(&o2net_hb_up, O2HB_NODE_UP_CB, - o2net_hb_node_up_cb, NULL, O2NET_HB_PRI); - - ret = o2hb_register_callback(NULL, &o2net_hb_up); - if (ret == 0) - ret = o2hb_register_callback(NULL, &o2net_hb_down); - - if (ret) - o2net_unregister_hb_callbacks(); - - return ret; -} - -/* ------------------------------------------------------------ */ - -static int o2net_accept_one(struct socket *sock) -{ - int ret, slen; - struct sockaddr_in sin; - struct socket *new_sock = NULL; - struct o2nm_node *node = NULL; - struct o2nm_node *local_node = NULL; - struct o2net_sock_container *sc = NULL; - struct o2net_node *nn; - - BUG_ON(sock == NULL); - ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type, - sock->sk->sk_protocol, &new_sock); - if (ret) - goto out; - - new_sock->type = sock->type; - new_sock->ops = sock->ops; - ret = sock->ops->accept(sock, new_sock, O_NONBLOCK); - if (ret < 0) - goto out; - - new_sock->sk->sk_allocation = GFP_ATOMIC; - - ret = o2net_set_nodelay(new_sock); - if (ret) { - mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); - goto out; - } - - slen = sizeof(sin); - ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin, - &slen, 1); - if (ret < 0) - goto out; - - node = o2nm_get_node_by_ip(sin.sin_addr.s_addr); - if (node == NULL) { - printk(KERN_NOTICE "o2net: Attempt to connect from unknown " - "node at %pI4:%d\n", &sin.sin_addr.s_addr, - ntohs(sin.sin_port)); - ret = -EINVAL; - goto out; - } - - if (o2nm_this_node() >= node->nd_num) { - local_node = o2nm_get_node_by_num(o2nm_this_node()); - printk(KERN_NOTICE "o2net: Unexpected connect attempt seen " - "at node '%s' (%u, %pI4:%d) from node '%s' (%u, " - "%pI4:%d)\n", local_node->nd_name, local_node->nd_num, - &(local_node->nd_ipv4_address), - ntohs(local_node->nd_ipv4_port), node->nd_name, - node->nd_num, &sin.sin_addr.s_addr, ntohs(sin.sin_port)); - ret = -EINVAL; - goto out; - } - - /* this happens all the time when the other node sees our heartbeat - * and tries to connect before we see their heartbeat */ - if (!o2hb_check_node_heartbeating_from_callback(node->nd_num)) { - mlog(ML_CONN, "attempt to connect from node '%s' at " - "%pI4:%d but it isn't heartbeating\n", - node->nd_name, &sin.sin_addr.s_addr, - ntohs(sin.sin_port)); - ret = -EINVAL; - goto out; - } - - nn = o2net_nn_from_num(node->nd_num); - - spin_lock(&nn->nn_lock); - if (nn->nn_sc) - ret = -EBUSY; - else - ret = 0; - spin_unlock(&nn->nn_lock); - if (ret) { - printk(KERN_NOTICE "o2net: Attempt to connect from node '%s' " - "at %pI4:%d but it already has an open connection\n", - node->nd_name, &sin.sin_addr.s_addr, - ntohs(sin.sin_port)); - goto out; - } - - sc = sc_alloc(node); - if (sc == NULL) { - ret = -ENOMEM; - goto out; - } - - sc->sc_sock = new_sock; - new_sock = NULL; - - spin_lock(&nn->nn_lock); - atomic_set(&nn->nn_timeout, 0); - o2net_set_nn_state(nn, sc, 0, 0); - spin_unlock(&nn->nn_lock); - - o2net_register_callbacks(sc->sc_sock->sk, sc); - o2net_sc_queue_work(sc, &sc->sc_rx_work); - - o2net_initialize_handshake(); - o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand)); - -out: - if (new_sock) - sock_release(new_sock); - if (node) - o2nm_node_put(node); - if (local_node) - o2nm_node_put(local_node); - if (sc) - sc_put(sc); - return ret; -} - -static void o2net_accept_many(struct work_struct *work) -{ - struct socket *sock = o2net_listen_sock; - while (o2net_accept_one(sock) == 0) - cond_resched(); -} - -static void o2net_listen_data_ready(struct sock *sk, int bytes) -{ - void (*ready)(struct sock *sk, int bytes); - - read_lock(&sk->sk_callback_lock); - ready = sk->sk_user_data; - if (ready == NULL) { /* check for teardown race */ - ready = sk->sk_data_ready; - goto out; - } - - /* ->sk_data_ready is also called for a newly established child socket - * before it has been accepted and the acceptor has set up their - * data_ready.. we only want to queue listen work for our listening - * socket */ - if (sk->sk_state == TCP_LISTEN) { - mlog(ML_TCP, "bytes: %d\n", bytes); - queue_work(o2net_wq, &o2net_listen_work); - } - -out: - read_unlock(&sk->sk_callback_lock); - ready(sk, bytes); -} - -static int o2net_open_listening_sock(__be32 addr, __be16 port) -{ - struct socket *sock = NULL; - int ret; - struct sockaddr_in sin = { - .sin_family = PF_INET, - .sin_addr = { .s_addr = addr }, - .sin_port = port, - }; - - ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); - if (ret < 0) { - printk(KERN_ERR "o2net: Error %d while creating socket\n", ret); - goto out; - } - - sock->sk->sk_allocation = GFP_ATOMIC; - - write_lock_bh(&sock->sk->sk_callback_lock); - sock->sk->sk_user_data = sock->sk->sk_data_ready; - sock->sk->sk_data_ready = o2net_listen_data_ready; - write_unlock_bh(&sock->sk->sk_callback_lock); - - o2net_listen_sock = sock; - INIT_WORK(&o2net_listen_work, o2net_accept_many); - - sock->sk->sk_reuse = 1; - ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin)); - if (ret < 0) { - printk(KERN_ERR "o2net: Error %d while binding socket at " - "%pI4:%u\n", ret, &addr, ntohs(port)); - goto out; - } - - ret = sock->ops->listen(sock, 64); - if (ret < 0) - printk(KERN_ERR "o2net: Error %d while listening on %pI4:%u\n", - ret, &addr, ntohs(port)); - -out: - if (ret) { - o2net_listen_sock = NULL; - if (sock) - sock_release(sock); - } - return ret; -} - -/* - * called from node manager when we should bring up our network listening - * socket. node manager handles all the serialization to only call this - * once and to match it with o2net_stop_listening(). note, - * o2nm_this_node() doesn't work yet as we're being called while it - * is being set up. - */ -int o2net_start_listening(struct o2nm_node *node) -{ - int ret = 0; - - BUG_ON(o2net_wq != NULL); - BUG_ON(o2net_listen_sock != NULL); - - mlog(ML_KTHREAD, "starting o2net thread...\n"); - o2net_wq = create_singlethread_workqueue("o2net"); - if (o2net_wq == NULL) { - mlog(ML_ERROR, "unable to launch o2net thread\n"); - return -ENOMEM; /* ? */ - } - - ret = o2net_open_listening_sock(node->nd_ipv4_address, - node->nd_ipv4_port); - if (ret) { - destroy_workqueue(o2net_wq); - o2net_wq = NULL; - } else - o2quo_conn_up(node->nd_num); - - return ret; -} - -/* again, o2nm_this_node() doesn't work here as we're involved in - * tearing it down */ -void o2net_stop_listening(struct o2nm_node *node) -{ - struct socket *sock = o2net_listen_sock; - size_t i; - - BUG_ON(o2net_wq == NULL); - BUG_ON(o2net_listen_sock == NULL); - - /* stop the listening socket from generating work */ - write_lock_bh(&sock->sk->sk_callback_lock); - sock->sk->sk_data_ready = sock->sk->sk_user_data; - sock->sk->sk_user_data = NULL; - write_unlock_bh(&sock->sk->sk_callback_lock); - - for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) { - struct o2nm_node *node = o2nm_get_node_by_num(i); - if (node) { - o2net_disconnect_node(node); - o2nm_node_put(node); - } - } - - /* finish all work and tear down the work queue */ - mlog(ML_KTHREAD, "waiting for o2net thread to exit....\n"); - destroy_workqueue(o2net_wq); - o2net_wq = NULL; - - sock_release(o2net_listen_sock); - o2net_listen_sock = NULL; - - o2quo_conn_err(node->nd_num); -} - -/* ------------------------------------------------------------ */ - -int o2net_init(void) -{ - unsigned long i; - - o2quo_init(); - - if (o2net_debugfs_init()) - return -ENOMEM; - - o2net_hand = kzalloc(sizeof(struct o2net_handshake), GFP_KERNEL); - o2net_keep_req = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL); - o2net_keep_resp = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL); - if (!o2net_hand || !o2net_keep_req || !o2net_keep_resp) { - kfree(o2net_hand); - kfree(o2net_keep_req); - kfree(o2net_keep_resp); - return -ENOMEM; - } - - o2net_hand->protocol_version = cpu_to_be64(O2NET_PROTOCOL_VERSION); - o2net_hand->connector_id = cpu_to_be64(1); - - o2net_keep_req->magic = cpu_to_be16(O2NET_MSG_KEEP_REQ_MAGIC); - o2net_keep_resp->magic = cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC); - - for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) { - struct o2net_node *nn = o2net_nn_from_num(i); - - atomic_set(&nn->nn_timeout, 0); - spin_lock_init(&nn->nn_lock); - INIT_DELAYED_WORK(&nn->nn_connect_work, o2net_start_connect); - INIT_DELAYED_WORK(&nn->nn_connect_expired, - o2net_connect_expired); - INIT_DELAYED_WORK(&nn->nn_still_up, o2net_still_up); - /* until we see hb from a node we'll return einval */ - nn->nn_persistent_error = -ENOTCONN; - init_waitqueue_head(&nn->nn_sc_wq); - idr_init(&nn->nn_status_idr); - INIT_LIST_HEAD(&nn->nn_status_list); - } - - return 0; -} - -void o2net_exit(void) -{ - o2quo_exit(); - kfree(o2net_hand); - kfree(o2net_keep_req); - kfree(o2net_keep_resp); - o2net_debugfs_exit(); -} |