[PATCH] OCFS2: The Second Oracle Cluster Filesystem

The OCFS2 file system module.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>

1 files changed, 378 insertions, 0 deletions

diff --git a/fs/ocfs2/heartbeat.c b/fs/ocfs2/heartbeat.c
new file mode 100644
index 0000000..0bbd22f
--- /dev/null
+++ b/fs/ocfs2/heartbeat.c
@@ -0,0 +1,378 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * heartbeat.c
+ *
+ * Register ourselves with the heartbaet service, keep our node maps
+ * up to date, and fire off recovery when needed.
+ *
+ * Copyright (C) 2002, 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.
+ */
+
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/highmem.h>
+#include <linux/kmod.h>
+
+#include <cluster/heartbeat.h>
+#include <cluster/nodemanager.h>
+
+#include <dlm/dlmapi.h>
+
+#define MLOG_MASK_PREFIX ML_SUPER
+#include <cluster/masklog.h>
+
+#include "ocfs2.h"
+
+#include "alloc.h"
+#include "heartbeat.h"
+#include "inode.h"
+#include "journal.h"
+#include "vote.h"
+
+#include "buffer_head_io.h"
+
+#define OCFS2_HB_NODE_DOWN_PRI     (0x0000002)
+#define OCFS2_HB_NODE_UP_PRI	   OCFS2_HB_NODE_DOWN_PRI
+
+static inline void __ocfs2_node_map_set_bit(struct ocfs2_node_map *map,
+					    int bit);
+static inline void __ocfs2_node_map_clear_bit(struct ocfs2_node_map *map,
+					      int bit);
+static inline int __ocfs2_node_map_is_empty(struct ocfs2_node_map *map);
+static void __ocfs2_node_map_dup(struct ocfs2_node_map *target,
+				 struct ocfs2_node_map *from);
+static void __ocfs2_node_map_set(struct ocfs2_node_map *target,
+				 struct ocfs2_node_map *from);
+
+void ocfs2_init_node_maps(struct ocfs2_super *osb)
+{
+	spin_lock_init(&osb->node_map_lock);
+	ocfs2_node_map_init(&osb->mounted_map);
+	ocfs2_node_map_init(&osb->recovery_map);
+	ocfs2_node_map_init(&osb->umount_map);
+}
+
+static void ocfs2_do_node_down(int node_num,
+			       struct ocfs2_super *osb)
+{
+	BUG_ON(osb->node_num == node_num);
+
+	mlog(0, "ocfs2: node down event for %d\n", node_num);
+
+	if (!osb->dlm) {
+		/*
+		 * No DLM means we're not even ready to participate yet.
+		 * We check the slots after the DLM comes up, so we will
+		 * notice the node death then.  We can safely ignore it
+		 * here.
+		 */
+		return;
+	}
+
+	if (ocfs2_node_map_test_bit(osb, &osb->umount_map, node_num)) {
+		/* If a node is in the umount map, then we've been
+		 * expecting him to go down and we know ahead of time
+		 * that recovery is not necessary. */
+		ocfs2_node_map_clear_bit(osb, &osb->umount_map, node_num);
+		return;
+	}
+
+	ocfs2_recovery_thread(osb, node_num);
+
+	ocfs2_remove_node_from_vote_queues(osb, node_num);
+}
+
+static void ocfs2_hb_node_down_cb(struct o2nm_node *node,
+				  int node_num,
+				  void *data)
+{
+	ocfs2_do_node_down(node_num, (struct ocfs2_super *) data);
+}
+
+/* Called from the dlm when it's about to evict a node. We may also
+ * get a heartbeat callback later. */
+static void ocfs2_dlm_eviction_cb(int node_num,
+				  void *data)
+{
+	struct ocfs2_super *osb = (struct ocfs2_super *) data;
+	struct super_block *sb = osb->sb;
+
+	mlog(ML_NOTICE, "device (%u,%u): dlm has evicted node %d\n",
+	     MAJOR(sb->s_dev), MINOR(sb->s_dev), node_num);
+
+	ocfs2_do_node_down(node_num, osb);
+}
+
+static void ocfs2_hb_node_up_cb(struct o2nm_node *node,
+				int node_num,
+				void *data)
+{
+	struct ocfs2_super *osb = data;
+
+	BUG_ON(osb->node_num == node_num);
+
+	mlog(0, "node up event for %d\n", node_num);
+	ocfs2_node_map_clear_bit(osb, &osb->umount_map, node_num);
+}
+
+void ocfs2_setup_hb_callbacks(struct ocfs2_super *osb)
+{
+	o2hb_setup_callback(&osb->osb_hb_down, O2HB_NODE_DOWN_CB,
+			    ocfs2_hb_node_down_cb, osb,
+			    OCFS2_HB_NODE_DOWN_PRI);
+
+	o2hb_setup_callback(&osb->osb_hb_up, O2HB_NODE_UP_CB,
+			    ocfs2_hb_node_up_cb, osb, OCFS2_HB_NODE_UP_PRI);
+
+	/* Not exactly a heartbeat callback, but leads to essentially
+	 * the same path so we set it up here. */
+	dlm_setup_eviction_cb(&osb->osb_eviction_cb,
+			      ocfs2_dlm_eviction_cb,
+			      osb);
+}
+
+/* Most functions here are just stubs for now... */
+int ocfs2_register_hb_callbacks(struct ocfs2_super *osb)
+{
+	int status;
+
+	status = o2hb_register_callback(&osb->osb_hb_down);
+	if (status < 0) {
+		mlog_errno(status);
+		goto bail;
+	}
+
+	status = o2hb_register_callback(&osb->osb_hb_up);
+	if (status < 0)
+		mlog_errno(status);
+
+bail:
+	return status;
+}
+
+void ocfs2_clear_hb_callbacks(struct ocfs2_super *osb)
+{
+	int status;
+
+	status = o2hb_unregister_callback(&osb->osb_hb_down);
+	if (status < 0)
+		mlog_errno(status);
+
+	status = o2hb_unregister_callback(&osb->osb_hb_up);
+	if (status < 0)
+		mlog_errno(status);
+}
+
+void ocfs2_stop_heartbeat(struct ocfs2_super *osb)
+{
+	int ret;
+	char *argv[5], *envp[3];
+
+	if (!osb->uuid_str) {
+		/* This can happen if we don't get far enough in mount... */
+		mlog(0, "No UUID with which to stop heartbeat!\n\n");
+		return;
+	}
+
+	argv[0] = (char *)o2nm_get_hb_ctl_path();
+	argv[1] = "-K";
+	argv[2] = "-u";
+	argv[3] = osb->uuid_str;
+	argv[4] = NULL;
+
+	mlog(0, "Run: %s %s %s %s\n", argv[0], argv[1], argv[2], argv[3]);
+
+	/* minimal command environment taken from cpu_run_sbin_hotplug */
+	envp[0] = "HOME=/";
+	envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
+	envp[2] = NULL;
+
+	ret = call_usermodehelper(argv[0], argv, envp, 1);
+	if (ret < 0)
+		mlog_errno(ret);
+}
+
+/* special case -1 for now
+ * TODO: should *really* make sure the calling func never passes -1!!  */
+void ocfs2_node_map_init(struct ocfs2_node_map *map)
+{
+	map->num_nodes = OCFS2_NODE_MAP_MAX_NODES;
+	memset(map->map, 0, BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES) *
+	       sizeof(unsigned long));
+}
+
+static inline void __ocfs2_node_map_set_bit(struct ocfs2_node_map *map,
+					    int bit)
+{
+	set_bit(bit, map->map);
+}
+
+void ocfs2_node_map_set_bit(struct ocfs2_super *osb,
+			    struct ocfs2_node_map *map,
+			    int bit)
+{
+	if (bit==-1)
+		return;
+	BUG_ON(bit >= map->num_nodes);
+	spin_lock(&osb->node_map_lock);
+	__ocfs2_node_map_set_bit(map, bit);
+	spin_unlock(&osb->node_map_lock);
+}
+
+static inline void __ocfs2_node_map_clear_bit(struct ocfs2_node_map *map,
+					      int bit)
+{
+	clear_bit(bit, map->map);
+}
+
+void ocfs2_node_map_clear_bit(struct ocfs2_super *osb,
+			      struct ocfs2_node_map *map,
+			      int bit)
+{
+	if (bit==-1)
+		return;
+	BUG_ON(bit >= map->num_nodes);
+	spin_lock(&osb->node_map_lock);
+	__ocfs2_node_map_clear_bit(map, bit);
+	spin_unlock(&osb->node_map_lock);
+}
+
+int ocfs2_node_map_test_bit(struct ocfs2_super *osb,
+			    struct ocfs2_node_map *map,
+			    int bit)
+{
+	int ret;
+	if (bit >= map->num_nodes) {
+		mlog(ML_ERROR, "bit=%d map->num_nodes=%d\n", bit, map->num_nodes);
+		BUG();
+	}
+	spin_lock(&osb->node_map_lock);
+	ret = test_bit(bit, map->map);
+	spin_unlock(&osb->node_map_lock);
+	return ret;
+}
+
+static inline int __ocfs2_node_map_is_empty(struct ocfs2_node_map *map)
+{
+	int bit;
+	bit = find_next_bit(map->map, map->num_nodes, 0);
+	if (bit < map->num_nodes)
+		return 0;
+	return 1;
+}
+
+int ocfs2_node_map_is_empty(struct ocfs2_super *osb,
+			    struct ocfs2_node_map *map)
+{
+	int ret;
+	BUG_ON(map->num_nodes == 0);
+	spin_lock(&osb->node_map_lock);
+	ret = __ocfs2_node_map_is_empty(map);
+	spin_unlock(&osb->node_map_lock);
+	return ret;
+}
+
+static void __ocfs2_node_map_dup(struct ocfs2_node_map *target,
+				 struct ocfs2_node_map *from)
+{
+	BUG_ON(from->num_nodes == 0);
+	ocfs2_node_map_init(target);
+	__ocfs2_node_map_set(target, from);
+}
+
+/* returns 1 if bit is the only bit set in target, 0 otherwise */
+int ocfs2_node_map_is_only(struct ocfs2_super *osb,
+			   struct ocfs2_node_map *target,
+			   int bit)
+{
+	struct ocfs2_node_map temp;
+	int ret;
+
+	spin_lock(&osb->node_map_lock);
+	__ocfs2_node_map_dup(&temp, target);
+	__ocfs2_node_map_clear_bit(&temp, bit);
+	ret = __ocfs2_node_map_is_empty(&temp);
+	spin_unlock(&osb->node_map_lock);
+
+	return ret;
+}
+
+static void __ocfs2_node_map_set(struct ocfs2_node_map *target,
+				 struct ocfs2_node_map *from)
+{
+	int num_longs, i;
+
+	BUG_ON(target->num_nodes != from->num_nodes);
+	BUG_ON(target->num_nodes == 0);
+
+	num_longs = BITS_TO_LONGS(target->num_nodes);
+	for (i = 0; i < num_longs; i++)
+		target->map[i] = from->map[i];
+}
+
+/* Returns whether the recovery bit was actually set - it may not be
+ * if a node is still marked as needing recovery */
+int ocfs2_recovery_map_set(struct ocfs2_super *osb,
+			   int num)
+{
+	int set = 0;
+
+	spin_lock(&osb->node_map_lock);
+
+	__ocfs2_node_map_clear_bit(&osb->mounted_map, num);
+
+	if (!test_bit(num, osb->recovery_map.map)) {
+	    __ocfs2_node_map_set_bit(&osb->recovery_map, num);
+	    set = 1;
+	}
+
+	spin_unlock(&osb->node_map_lock);
+
+	return set;
+}
+
+void ocfs2_recovery_map_clear(struct ocfs2_super *osb,
+			      int num)
+{
+	ocfs2_node_map_clear_bit(osb, &osb->recovery_map, num);
+}
+
+int ocfs2_node_map_iterate(struct ocfs2_super *osb,
+			   struct ocfs2_node_map *map,
+			   int idx)
+{
+	int i = idx;
+
+	idx = O2NM_INVALID_NODE_NUM;
+	spin_lock(&osb->node_map_lock);
+	if ((i != O2NM_INVALID_NODE_NUM) &&
+	    (i >= 0) &&
+	    (i < map->num_nodes)) {
+		while(i < map->num_nodes) {
+			if (test_bit(i, map->map)) {
+				idx = i;
+				break;
+			}
+			i++;
+		}
+	}
+	spin_unlock(&osb->node_map_lock);
+	return idx;
+}