[PATCH] OCFS2: The Second Oracle Cluster Filesystem
Node messaging via tcp. Used by the dlm and the file system for point to point communication between nodes. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com> Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
This commit is contained in:
Zach Brown
Joel Becker
parent
a7f6a5fb4b
commit
98211489d4
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/* -*- mode: c; c-basic-offset: 8; -*-
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*
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* Copyright (C) 2005 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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||||
* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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/* This quorum hack is only here until we transition to some more rational
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* approach that is driven from userspace. Honest. No foolin'.
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*
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* Imagine two nodes lose network connectivity to each other but they're still
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* up and operating in every other way. Presumably a network timeout indicates
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* that a node is broken and should be recovered. They can't both recover each
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* other and both carry on without serialising their access to the file system.
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* They need to decide who is authoritative. Now extend that problem to
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* arbitrary groups of nodes losing connectivity between each other.
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*
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* So we declare that a node which has given up on connecting to a majority
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* of nodes who are still heartbeating will fence itself.
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*
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* There are huge opportunities for races here. After we give up on a node's
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* connection we need to wait long enough to give heartbeat an opportunity
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* to declare the node as truly dead. We also need to be careful with the
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* race between when we see a node start heartbeating and when we connect
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* to it.
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*
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* So nodes that are in this transtion put a hold on the quorum decision
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* with a counter. As they fall out of this transition they drop the count
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* and if they're the last, they fire off the decision.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include "heartbeat.h"
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#include "nodemanager.h"
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#define MLOG_MASK_PREFIX ML_QUORUM
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#include "masklog.h"
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#include "quorum.h"
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static struct o2quo_state {
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spinlock_t qs_lock;
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struct work_struct qs_work;
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int qs_pending;
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int qs_heartbeating;
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unsigned long qs_hb_bm[BITS_TO_LONGS(O2NM_MAX_NODES)];
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int qs_connected;
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unsigned long qs_conn_bm[BITS_TO_LONGS(O2NM_MAX_NODES)];
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int qs_holds;
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unsigned long qs_hold_bm[BITS_TO_LONGS(O2NM_MAX_NODES)];
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} o2quo_state;
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/* this is horribly heavy-handed. It should instead flip the file
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* system RO and call some userspace script. */
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static void o2quo_fence_self(void)
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{
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/* panic spins with interrupts enabled. with preempt
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* threads can still schedule, etc, etc */
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o2hb_stop_all_regions();
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panic("ocfs2 is very sorry to be fencing this system by panicing\n");
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}
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/* Indicate that a timeout occured on a hearbeat region write. The
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* other nodes in the cluster may consider us dead at that time so we
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* want to "fence" ourselves so that we don't scribble on the disk
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* after they think they've recovered us. This can't solve all
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* problems related to writeout after recovery but this hack can at
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* least close some of those gaps. When we have real fencing, this can
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* go away as our node would be fenced externally before other nodes
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* begin recovery. */
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void o2quo_disk_timeout(void)
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{
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o2quo_fence_self();
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}
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static void o2quo_make_decision(void *arg)
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{
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int quorum;
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int lowest_hb, lowest_reachable = 0, fence = 0;
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struct o2quo_state *qs = &o2quo_state;
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spin_lock(&qs->qs_lock);
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lowest_hb = find_first_bit(qs->qs_hb_bm, O2NM_MAX_NODES);
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if (lowest_hb != O2NM_MAX_NODES)
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lowest_reachable = test_bit(lowest_hb, qs->qs_conn_bm);
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mlog(0, "heartbeating: %d, connected: %d, "
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"lowest: %d (%sreachable)\n", qs->qs_heartbeating,
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qs->qs_connected, lowest_hb, lowest_reachable ? "" : "un");
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if (!test_bit(o2nm_this_node(), qs->qs_hb_bm) ||
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qs->qs_heartbeating == 1)
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goto out;
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if (qs->qs_heartbeating & 1) {
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/* the odd numbered cluster case is straight forward --
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* if we can't talk to the majority we're hosed */
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quorum = (qs->qs_heartbeating + 1)/2;
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if (qs->qs_connected < quorum) {
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mlog(ML_ERROR, "fencing this node because it is "
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"only connected to %u nodes and %u is needed "
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"to make a quorum out of %u heartbeating nodes\n",
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qs->qs_connected, quorum,
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qs->qs_heartbeating);
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fence = 1;
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}
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} else {
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/* the even numbered cluster adds the possibility of each half
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* of the cluster being able to talk amongst themselves.. in
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* that case we're hosed if we can't talk to the group that has
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* the lowest numbered node */
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quorum = qs->qs_heartbeating / 2;
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if (qs->qs_connected < quorum) {
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mlog(ML_ERROR, "fencing this node because it is "
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"only connected to %u nodes and %u is needed "
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"to make a quorum out of %u heartbeating nodes\n",
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qs->qs_connected, quorum,
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qs->qs_heartbeating);
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fence = 1;
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}
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else if ((qs->qs_connected == quorum) &&
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!lowest_reachable) {
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mlog(ML_ERROR, "fencing this node because it is "
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"connected to a half-quorum of %u out of %u "
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"nodes which doesn't include the lowest active "
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"node %u\n", quorum, qs->qs_heartbeating,
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lowest_hb);
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fence = 1;
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}
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}
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out:
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spin_unlock(&qs->qs_lock);
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if (fence)
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o2quo_fence_self();
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}
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static void o2quo_set_hold(struct o2quo_state *qs, u8 node)
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{
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assert_spin_locked(&qs->qs_lock);
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if (!test_and_set_bit(node, qs->qs_hold_bm)) {
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qs->qs_holds++;
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mlog_bug_on_msg(qs->qs_holds == O2NM_MAX_NODES,
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"node %u\n", node);
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mlog(0, "node %u, %d total\n", node, qs->qs_holds);
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}
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}
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static void o2quo_clear_hold(struct o2quo_state *qs, u8 node)
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{
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assert_spin_locked(&qs->qs_lock);
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if (test_and_clear_bit(node, qs->qs_hold_bm)) {
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mlog(0, "node %u, %d total\n", node, qs->qs_holds - 1);
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if (--qs->qs_holds == 0) {
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if (qs->qs_pending) {
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qs->qs_pending = 0;
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schedule_work(&qs->qs_work);
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}
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}
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mlog_bug_on_msg(qs->qs_holds < 0, "node %u, holds %d\n",
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node, qs->qs_holds);
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}
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}
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/* as a node comes up we delay the quorum decision until we know the fate of
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* the connection. the hold will be droped in conn_up or hb_down. it might be
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* perpetuated by con_err until hb_down. if we already have a conn, we might
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* be dropping a hold that conn_up got. */
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void o2quo_hb_up(u8 node)
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{
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struct o2quo_state *qs = &o2quo_state;
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spin_lock(&qs->qs_lock);
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qs->qs_heartbeating++;
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mlog_bug_on_msg(qs->qs_heartbeating == O2NM_MAX_NODES,
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"node %u\n", node);
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mlog_bug_on_msg(test_bit(node, qs->qs_hb_bm), "node %u\n", node);
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set_bit(node, qs->qs_hb_bm);
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mlog(0, "node %u, %d total\n", node, qs->qs_heartbeating);
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if (!test_bit(node, qs->qs_conn_bm))
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o2quo_set_hold(qs, node);
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else
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o2quo_clear_hold(qs, node);
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spin_unlock(&qs->qs_lock);
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}
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/* hb going down releases any holds we might have had due to this node from
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* conn_up, conn_err, or hb_up */
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void o2quo_hb_down(u8 node)
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{
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struct o2quo_state *qs = &o2quo_state;
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spin_lock(&qs->qs_lock);
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qs->qs_heartbeating--;
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mlog_bug_on_msg(qs->qs_heartbeating < 0,
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"node %u, %d heartbeating\n",
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node, qs->qs_heartbeating);
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mlog_bug_on_msg(!test_bit(node, qs->qs_hb_bm), "node %u\n", node);
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clear_bit(node, qs->qs_hb_bm);
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mlog(0, "node %u, %d total\n", node, qs->qs_heartbeating);
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o2quo_clear_hold(qs, node);
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spin_unlock(&qs->qs_lock);
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}
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/* this tells us that we've decided that the node is still heartbeating
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* even though we've lost it's conn. it must only be called after conn_err
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* and indicates that we must now make a quorum decision in the future,
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* though we might be doing so after waiting for holds to drain. Here
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* we'll be dropping the hold from conn_err. */
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void o2quo_hb_still_up(u8 node)
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{
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struct o2quo_state *qs = &o2quo_state;
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spin_lock(&qs->qs_lock);
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mlog(0, "node %u\n", node);
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qs->qs_pending = 1;
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o2quo_clear_hold(qs, node);
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spin_unlock(&qs->qs_lock);
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}
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/* This is analagous to hb_up. as a node's connection comes up we delay the
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* quorum decision until we see it heartbeating. the hold will be droped in
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* hb_up or hb_down. it might be perpetuated by con_err until hb_down. if
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* it's already heartbeating we we might be dropping a hold that conn_up got.
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* */
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void o2quo_conn_up(u8 node)
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{
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struct o2quo_state *qs = &o2quo_state;
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spin_lock(&qs->qs_lock);
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qs->qs_connected++;
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mlog_bug_on_msg(qs->qs_connected == O2NM_MAX_NODES,
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"node %u\n", node);
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mlog_bug_on_msg(test_bit(node, qs->qs_conn_bm), "node %u\n", node);
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set_bit(node, qs->qs_conn_bm);
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mlog(0, "node %u, %d total\n", node, qs->qs_connected);
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if (!test_bit(node, qs->qs_hb_bm))
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o2quo_set_hold(qs, node);
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else
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o2quo_clear_hold(qs, node);
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spin_unlock(&qs->qs_lock);
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}
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/* we've decided that we won't ever be connecting to the node again. if it's
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* still heartbeating we grab a hold that will delay decisions until either the
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* node stops heartbeating from hb_down or the caller decides that the node is
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* still up and calls still_up */
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void o2quo_conn_err(u8 node)
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{
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struct o2quo_state *qs = &o2quo_state;
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spin_lock(&qs->qs_lock);
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if (test_bit(node, qs->qs_conn_bm)) {
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qs->qs_connected--;
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mlog_bug_on_msg(qs->qs_connected < 0,
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"node %u, connected %d\n",
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node, qs->qs_connected);
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clear_bit(node, qs->qs_conn_bm);
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}
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mlog(0, "node %u, %d total\n", node, qs->qs_connected);
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if (test_bit(node, qs->qs_hb_bm))
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o2quo_set_hold(qs, node);
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spin_unlock(&qs->qs_lock);
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}
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void o2quo_init(void)
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{
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struct o2quo_state *qs = &o2quo_state;
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spin_lock_init(&qs->qs_lock);
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INIT_WORK(&qs->qs_work, o2quo_make_decision, NULL);
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}
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void o2quo_exit(void)
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{
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flush_scheduled_work();
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}
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@ -0,0 +1,36 @@
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/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* Copyright (C) 2005 Oracle. All rights reserved.
|
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*
|
||||
* 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,
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* Boston, MA 021110-1307, USA.
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*
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*/
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#ifndef O2CLUSTER_QUORUM_H
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#define O2CLUSTER_QUORUM_H
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void o2quo_init(void);
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void o2quo_exit(void);
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void o2quo_hb_up(u8 node);
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void o2quo_hb_down(u8 node);
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void o2quo_hb_still_up(u8 node);
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void o2quo_conn_up(u8 node);
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void o2quo_conn_err(u8 node);
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void o2quo_disk_timeout(void);
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#endif /* O2CLUSTER_QUORUM_H */
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@ -0,0 +1,124 @@
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/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* sys.c
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*
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* OCFS2 cluster sysfs interface
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*
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* Copyright (C) 2005 Oracle. All rights reserved.
|
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*
|
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* 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,
|
||||
* version 2 of the License.
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/kobject.h>
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#include <linux/sysfs.h>
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#include "ocfs2_nodemanager.h"
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#include "masklog.h"
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#include "sys.h"
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struct o2cb_attribute {
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struct attribute attr;
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ssize_t (*show)(char *buf);
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ssize_t (*store)(const char *buf, size_t count);
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||||
};
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||||
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#define O2CB_ATTR(_name, _mode, _show, _store) \
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struct o2cb_attribute o2cb_attr_##_name = __ATTR(_name, _mode, _show, _store)
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#define to_o2cb_subsys(k) container_of(to_kset(k), struct subsystem, kset)
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#define to_o2cb_attr(_attr) container_of(_attr, struct o2cb_attribute, attr)
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||||
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||||
static ssize_t o2cb_interface_revision_show(char *buf)
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||||
{
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||||
return snprintf(buf, PAGE_SIZE, "%u\n", O2NM_API_VERSION);
|
||||
}
|
||||
|
||||
O2CB_ATTR(interface_revision, S_IFREG | S_IRUGO, o2cb_interface_revision_show, NULL);
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static struct attribute *o2cb_attrs[] = {
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&o2cb_attr_interface_revision.attr,
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NULL,
|
||||
};
|
||||
|
||||
static ssize_t
|
||||
o2cb_show(struct kobject * kobj, struct attribute * attr, char * buffer);
|
||||
static ssize_t
|
||||
o2cb_store(struct kobject * kobj, struct attribute * attr,
|
||||
const char * buffer, size_t count);
|
||||
static struct sysfs_ops o2cb_sysfs_ops = {
|
||||
.show = o2cb_show,
|
||||
.store = o2cb_store,
|
||||
};
|
||||
|
||||
static struct kobj_type o2cb_subsys_type = {
|
||||
.default_attrs = o2cb_attrs,
|
||||
.sysfs_ops = &o2cb_sysfs_ops,
|
||||
};
|
||||
|
||||
/* gives us o2cb_subsys */
|
||||
decl_subsys(o2cb, NULL, NULL);
|
||||
|
||||
static ssize_t
|
||||
o2cb_show(struct kobject * kobj, struct attribute * attr, char * buffer)
|
||||
{
|
||||
struct o2cb_attribute *o2cb_attr = to_o2cb_attr(attr);
|
||||
struct subsystem *sbs = to_o2cb_subsys(kobj);
|
||||
|
||||
BUG_ON(sbs != &o2cb_subsys);
|
||||
|
||||
if (o2cb_attr->show)
|
||||
return o2cb_attr->show(buffer);
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
static ssize_t
|
||||
o2cb_store(struct kobject * kobj, struct attribute * attr,
|
||||
const char * buffer, size_t count)
|
||||
{
|
||||
struct o2cb_attribute *o2cb_attr = to_o2cb_attr(attr);
|
||||
struct subsystem *sbs = to_o2cb_subsys(kobj);
|
||||
|
||||
BUG_ON(sbs != &o2cb_subsys);
|
||||
|
||||
if (o2cb_attr->store)
|
||||
return o2cb_attr->store(buffer, count);
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
void o2cb_sys_shutdown(void)
|
||||
{
|
||||
mlog_sys_shutdown();
|
||||
subsystem_unregister(&o2cb_subsys);
|
||||
}
|
||||
|
||||
int o2cb_sys_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
o2cb_subsys.kset.kobj.ktype = &o2cb_subsys_type;
|
||||
ret = subsystem_register(&o2cb_subsys);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = mlog_sys_init(&o2cb_subsys);
|
||||
if (ret)
|
||||
subsystem_unregister(&o2cb_subsys);
|
||||
return ret;
|
||||
}
|
||||
|
|
@ -0,0 +1,33 @@
|
|||
/* -*- mode: c; c-basic-offset: 8; -*-
|
||||
* vim: noexpandtab sw=8 ts=8 sts=0:
|
||||
*
|
||||
* sys.h
|
||||
*
|
||||
* Function prototypes for o2cb sysfs interface
|
||||
*
|
||||
* Copyright (C) 2005 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,
|
||||
* version 2 of the License.
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef O2CLUSTER_SYS_H
|
||||
#define O2CLUSTER_SYS_H
|
||||
|
||||
void o2cb_sys_shutdown(void);
|
||||
int o2cb_sys_init(void);
|
||||
|
||||
#endif /* O2CLUSTER_SYS_H */
|
||||
File diff suppressed because it is too large
Load Diff
|
|
@ -0,0 +1,113 @@
|
|||
/* -*- mode: c; c-basic-offset: 8; -*-
|
||||
* vim: noexpandtab sw=8 ts=8 sts=0:
|
||||
*
|
||||
* tcp.h
|
||||
*
|
||||
* Function prototypes
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef O2CLUSTER_TCP_H
|
||||
#define O2CLUSTER_TCP_H
|
||||
|
||||
#include <linux/socket.h>
|
||||
#ifdef __KERNEL__
|
||||
#include <net/sock.h>
|
||||
#include <linux/tcp.h>
|
||||
#else
|
||||
#include <sys/socket.h>
|
||||
#endif
|
||||
#include <linux/inet.h>
|
||||
#include <linux/in.h>
|
||||
|
||||
struct o2net_msg
|
||||
{
|
||||
__be16 magic;
|
||||
__be16 data_len;
|
||||
__be16 msg_type;
|
||||
__be16 pad1;
|
||||
__be32 sys_status;
|
||||
__be32 status;
|
||||
__be32 key;
|
||||
__be32 msg_num;
|
||||
__u8 buf[0];
|
||||
};
|
||||
|
||||
typedef int (o2net_msg_handler_func)(struct o2net_msg *msg, u32 len, void *data);
|
||||
|
||||
#define O2NET_MAX_PAYLOAD_BYTES (4096 - sizeof(struct o2net_msg))
|
||||
|
||||
/* TODO: figure this out.... */
|
||||
static inline int o2net_link_down(int err, struct socket *sock)
|
||||
{
|
||||
if (sock) {
|
||||
if (sock->sk->sk_state != TCP_ESTABLISHED &&
|
||||
sock->sk->sk_state != TCP_CLOSE_WAIT)
|
||||
return 1;
|
||||
}
|
||||
|
||||
if (err >= 0)
|
||||
return 0;
|
||||
switch (err) {
|
||||
/* ????????????????????????? */
|
||||
case -ERESTARTSYS:
|
||||
case -EBADF:
|
||||
/* When the server has died, an ICMP port unreachable
|
||||
* message prompts ECONNREFUSED. */
|
||||
case -ECONNREFUSED:
|
||||
case -ENOTCONN:
|
||||
case -ECONNRESET:
|
||||
case -EPIPE:
|
||||
return 1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
enum {
|
||||
O2NET_DRIVER_UNINITED,
|
||||
O2NET_DRIVER_READY,
|
||||
};
|
||||
|
||||
int o2net_init_tcp_sock(struct inode *inode);
|
||||
int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len,
|
||||
u8 target_node, int *status);
|
||||
int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *vec,
|
||||
size_t veclen, u8 target_node, int *status);
|
||||
int o2net_broadcast_message(u32 msg_type, u32 key, void *data, u32 len,
|
||||
struct inode *group);
|
||||
|
||||
int o2net_register_handler(u32 msg_type, u32 key, u32 max_len,
|
||||
o2net_msg_handler_func *func, void *data,
|
||||
struct list_head *unreg_list);
|
||||
void o2net_unregister_handler_list(struct list_head *list);
|
||||
|
||||
struct o2nm_node;
|
||||
int o2net_register_hb_callbacks(void);
|
||||
void o2net_unregister_hb_callbacks(void);
|
||||
int o2net_start_listening(struct o2nm_node *node);
|
||||
void o2net_stop_listening(struct o2nm_node *node);
|
||||
void o2net_disconnect_node(struct o2nm_node *node);
|
||||
|
||||
int o2net_init(void);
|
||||
void o2net_exit(void);
|
||||
int o2net_proc_init(struct proc_dir_entry *parent);
|
||||
void o2net_proc_exit(struct proc_dir_entry *parent);
|
||||
|
||||
#endif /* O2CLUSTER_TCP_H */
|
||||
|
|
@ -0,0 +1,174 @@
|
|||
/* -*- mode: c; c-basic-offset: 8; -*-
|
||||
* vim: noexpandtab sw=8 ts=8 sts=0:
|
||||
*
|
||||
* Copyright (C) 2005 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.
|
||||
*/
|
||||
|
||||
#ifndef O2CLUSTER_TCP_INTERNAL_H
|
||||
#define O2CLUSTER_TCP_INTERNAL_H
|
||||
|
||||
#define O2NET_MSG_MAGIC ((u16)0xfa55)
|
||||
#define O2NET_MSG_STATUS_MAGIC ((u16)0xfa56)
|
||||
#define O2NET_MSG_KEEP_REQ_MAGIC ((u16)0xfa57)
|
||||
#define O2NET_MSG_KEEP_RESP_MAGIC ((u16)0xfa58)
|
||||
|
||||
/* same as hb delay, we're waiting for another node to recognize our hb */
|
||||
#define O2NET_RECONNECT_DELAY_MS O2HB_REGION_TIMEOUT_MS
|
||||
|
||||
/* we're delaying our quorum decision so that heartbeat will have timed
|
||||
* out truly dead nodes by the time we come around to making decisions
|
||||
* on their number */
|
||||
#define O2NET_QUORUM_DELAY_MS ((o2hb_dead_threshold + 2) * O2HB_REGION_TIMEOUT_MS)
|
||||
|
||||
#define O2NET_KEEPALIVE_DELAY_SECS 5
|
||||
#define O2NET_IDLE_TIMEOUT_SECS 10
|
||||
|
||||
/*
|
||||
* This version number represents quite a lot, unfortunately. It not
|
||||
* only represents the raw network message protocol on the wire but also
|
||||
* locking semantics of the file system using the protocol. It should
|
||||
* be somewhere else, I'm sure, but right now it isn't.
|
||||
*
|
||||
* New in version 2:
|
||||
* - full 64 bit i_size in the metadata lock lvbs
|
||||
* - introduction of "rw" lock and pushing meta/data locking down
|
||||
*/
|
||||
#define O2NET_PROTOCOL_VERSION 2ULL
|
||||
struct o2net_handshake {
|
||||
__be64 protocol_version;
|
||||
__be64 connector_id;
|
||||
};
|
||||
|
||||
struct o2net_node {
|
||||
/* this is never called from int/bh */
|
||||
spinlock_t nn_lock;
|
||||
|
||||
/* set the moment an sc is allocated and a connect is started */
|
||||
struct o2net_sock_container *nn_sc;
|
||||
/* _valid is only set after the handshake passes and tx can happen */
|
||||
unsigned nn_sc_valid:1;
|
||||
/* if this is set tx just returns it */
|
||||
int nn_persistent_error;
|
||||
|
||||
/* threads waiting for an sc to arrive wait on the wq for generation
|
||||
* to increase. it is increased when a connecting socket succeeds
|
||||
* or fails or when an accepted socket is attached. */
|
||||
wait_queue_head_t nn_sc_wq;
|
||||
|
||||
struct idr nn_status_idr;
|
||||
struct list_head nn_status_list;
|
||||
|
||||
/* connects are attempted from when heartbeat comes up until either hb
|
||||
* goes down, the node is unconfigured, no connect attempts succeed
|
||||
* before O2NET_CONN_IDLE_DELAY, or a connect succeeds. connect_work
|
||||
* is queued from set_nn_state both from hb up and from itself if a
|
||||
* connect attempt fails and so can be self-arming. shutdown is
|
||||
* careful to first mark the nn such that no connects will be attempted
|
||||
* before canceling delayed connect work and flushing the queue. */
|
||||
struct work_struct nn_connect_work;
|
||||
unsigned long nn_last_connect_attempt;
|
||||
|
||||
/* this is queued as nodes come up and is canceled when a connection is
|
||||
* established. this expiring gives up on the node and errors out
|
||||
* transmits */
|
||||
struct work_struct nn_connect_expired;
|
||||
|
||||
/* after we give up on a socket we wait a while before deciding
|
||||
* that it is still heartbeating and that we should do some
|
||||
* quorum work */
|
||||
struct work_struct nn_still_up;
|
||||
};
|
||||
|
||||
struct o2net_sock_container {
|
||||
struct kref sc_kref;
|
||||
/* the next two are vaild for the life time of the sc */
|
||||
struct socket *sc_sock;
|
||||
struct o2nm_node *sc_node;
|
||||
|
||||
/* all of these sc work structs hold refs on the sc while they are
|
||||
* queued. they should not be able to ref a freed sc. the teardown
|
||||
* race is with o2net_wq destruction in o2net_stop_listening() */
|
||||
|
||||
/* rx and connect work are generated from socket callbacks. sc
|
||||
* shutdown removes the callbacks and then flushes the work queue */
|
||||
struct work_struct sc_rx_work;
|
||||
struct work_struct sc_connect_work;
|
||||
/* shutdown work is triggered in two ways. the simple way is
|
||||
* for a code path calls ensure_shutdown which gets a lock, removes
|
||||
* the sc from the nn, and queues the work. in this case the
|
||||
* work is single-shot. the work is also queued from a sock
|
||||
* callback, though, and in this case the work will find the sc
|
||||
* still on the nn and will call ensure_shutdown itself.. this
|
||||
* ends up triggering the shutdown work again, though nothing
|
||||
* will be done in that second iteration. so work queue teardown
|
||||
* has to be careful to remove the sc from the nn before waiting
|
||||
* on the work queue so that the shutdown work doesn't remove the
|
||||
* sc and rearm itself.
|
||||
*/
|
||||
struct work_struct sc_shutdown_work;
|
||||
|
||||
struct timer_list sc_idle_timeout;
|
||||
struct work_struct sc_keepalive_work;
|
||||
|
||||
unsigned sc_handshake_ok:1;
|
||||
|
||||
struct page *sc_page;
|
||||
size_t sc_page_off;
|
||||
|
||||
/* original handlers for the sockets */
|
||||
void (*sc_state_change)(struct sock *sk);
|
||||
void (*sc_data_ready)(struct sock *sk, int bytes);
|
||||
|
||||
struct timeval sc_tv_timer;
|
||||
struct timeval sc_tv_data_ready;
|
||||
struct timeval sc_tv_advance_start;
|
||||
struct timeval sc_tv_advance_stop;
|
||||
struct timeval sc_tv_func_start;
|
||||
struct timeval sc_tv_func_stop;
|
||||
u32 sc_msg_key;
|
||||
u16 sc_msg_type;
|
||||
};
|
||||
|
||||
struct o2net_msg_handler {
|
||||
struct rb_node nh_node;
|
||||
u32 nh_max_len;
|
||||
u32 nh_msg_type;
|
||||
u32 nh_key;
|
||||
o2net_msg_handler_func *nh_func;
|
||||
o2net_msg_handler_func *nh_func_data;
|
||||
struct kref nh_kref;
|
||||
struct list_head nh_unregister_item;
|
||||
};
|
||||
|
||||
enum o2net_system_error {
|
||||
O2NET_ERR_NONE = 0,
|
||||
O2NET_ERR_NO_HNDLR,
|
||||
O2NET_ERR_OVERFLOW,
|
||||
O2NET_ERR_DIED,
|
||||
O2NET_ERR_MAX
|
||||
};
|
||||
|
||||
struct o2net_status_wait {
|
||||
enum o2net_system_error ns_sys_status;
|
||||
s32 ns_status;
|
||||
int ns_id;
|
||||
wait_queue_head_t ns_wq;
|
||||
struct list_head ns_node_item;
|
||||
};
|
||||
|
||||
#endif /* O2CLUSTER_TCP_INTERNAL_H */
|
||||
Loading…
Reference in New Issue