Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm:
  dlm: add recovery callbacks
  dlm: add node slots and generation
  dlm: move recovery barrier calls
  dlm: convert rsb list to rb_tree

14 files changed, 873 insertions, 263 deletions

diff --git a/fs/dlm/config.c b/fs/dlm/config.c
index 6cf72fcc0d0..e7e327d43fa 100644
--- a/fs/dlm/config.c
+++ b/fs/dlm/config.c
@@ -2,7 +2,7 @@
 *******************************************************************************
 **
 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
-**  Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
+**  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
 **
 **  This copyrighted material is made available to anyone wishing to use,
 **  modify, copy, or redistribute it subject to the terms and conditions
@@ -17,6 +17,7 @@
 #include <linux/slab.h>
 #include <linux/in.h>
 #include <linux/in6.h>
+#include <linux/dlmconstants.h>
 #include <net/ipv6.h>
 #include <net/sock.h>
 
@@ -36,6 +37,7 @@
 static struct config_group *space_list;
 static struct config_group *comm_list;
 static struct dlm_comm *local_comm;
+static uint32_t dlm_comm_count;
 
 struct dlm_clusters;
 struct dlm_cluster;
@@ -103,6 +105,8 @@ struct dlm_cluster {
 	unsigned int cl_timewarn_cs;
 	unsigned int cl_waitwarn_us;
 	unsigned int cl_new_rsb_count;
+	unsigned int cl_recover_callbacks;
+	char cl_cluster_name[DLM_LOCKSPACE_LEN];
 };
 
 enum {
@@ -118,6 +122,8 @@ enum {
 	CLUSTER_ATTR_TIMEWARN_CS,
 	CLUSTER_ATTR_WAITWARN_US,
 	CLUSTER_ATTR_NEW_RSB_COUNT,
+	CLUSTER_ATTR_RECOVER_CALLBACKS,
+	CLUSTER_ATTR_CLUSTER_NAME,
 };
 
 struct cluster_attribute {
@@ -126,6 +132,27 @@ struct cluster_attribute {
 	ssize_t (*store)(struct dlm_cluster *, const char *, size_t);
 };
 
+static ssize_t cluster_cluster_name_read(struct dlm_cluster *cl, char *buf)
+{
+	return sprintf(buf, "%s\n", cl->cl_cluster_name);
+}
+
+static ssize_t cluster_cluster_name_write(struct dlm_cluster *cl,
+					  const char *buf, size_t len)
+{
+	strncpy(dlm_config.ci_cluster_name, buf, DLM_LOCKSPACE_LEN);
+	strncpy(cl->cl_cluster_name, buf, DLM_LOCKSPACE_LEN);
+	return len;
+}
+
+static struct cluster_attribute cluster_attr_cluster_name = {
+	.attr   = { .ca_owner = THIS_MODULE,
+                    .ca_name = "cluster_name",
+                    .ca_mode = S_IRUGO | S_IWUSR },
+	.show   = cluster_cluster_name_read,
+	.store  = cluster_cluster_name_write,
+};
+
 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
 			   int *info_field, int check_zero,
 			   const char *buf, size_t len)
@@ -171,6 +198,7 @@ CLUSTER_ATTR(protocol, 0);
 CLUSTER_ATTR(timewarn_cs, 1);
 CLUSTER_ATTR(waitwarn_us, 0);
 CLUSTER_ATTR(new_rsb_count, 0);
+CLUSTER_ATTR(recover_callbacks, 0);
 
 static struct configfs_attribute *cluster_attrs[] = {
 	[CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
@@ -185,6 +213,8 @@ static struct configfs_attribute *cluster_attrs[] = {
 	[CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
 	[CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us.attr,
 	[CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count.attr,
+	[CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks.attr,
+	[CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name.attr,
 	NULL,
 };
 
@@ -293,6 +323,7 @@ struct dlm_comms {
 
 struct dlm_comm {
 	struct config_item item;
+	int seq;
 	int nodeid;
 	int local;
 	int addr_count;
@@ -309,6 +340,7 @@ struct dlm_node {
 	int nodeid;
 	int weight;
 	int new;
+	int comm_seq; /* copy of cm->seq when nd->nodeid is set */
 };
 
 static struct configfs_group_operations clusters_ops = {
@@ -455,6 +487,9 @@ static struct config_group *make_cluster(struct config_group *g,
 	cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 	cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
 	cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
+	cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
+	memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
+	       DLM_LOCKSPACE_LEN);
 
 	space_list = &sps->ss_group;
 	comm_list = &cms->cs_group;
@@ -558,6 +593,11 @@ static struct config_item *make_comm(struct config_group *g, const char *name)
 		return ERR_PTR(-ENOMEM);
 
 	config_item_init_type_name(&cm->item, name, &comm_type);
+
+	cm->seq = dlm_comm_count++;
+	if (!cm->seq)
+		cm->seq = dlm_comm_count++;
+
 	cm->nodeid = -1;
 	cm->local = 0;
 	cm->addr_count = 0;
@@ -801,7 +841,10 @@ static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf)
 static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
 				 size_t len)
 {
+	uint32_t seq = 0;
 	nd->nodeid = simple_strtol(buf, NULL, 0);
+	dlm_comm_seq(nd->nodeid, &seq);
+	nd->comm_seq = seq;
 	return len;
 }
 
@@ -908,13 +951,13 @@ static void put_comm(struct dlm_comm *cm)
 }
 
 /* caller must free mem */
-int dlm_nodeid_list(char *lsname, int **ids_out, int *ids_count_out,
-		    int **new_out, int *new_count_out)
+int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
+		     int *count_out)
 {
 	struct dlm_space *sp;
 	struct dlm_node *nd;
-	int i = 0, rv = 0, ids_count = 0, new_count = 0;
-	int *ids, *new;
+	struct dlm_config_node *nodes, *node;
+	int rv, count;
 
 	sp = get_space(lsname);
 	if (!sp)
@@ -927,73 +970,42 @@ int dlm_nodeid_list(char *lsname, int **ids_out, int *ids_count_out,
 		goto out;
 	}
 
-	ids_count = sp->members_count;
+	count = sp->members_count;
 
-	ids = kcalloc(ids_count, sizeof(int), GFP_NOFS);
-	if (!ids) {
+	nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
+	if (!nodes) {
 		rv = -ENOMEM;
 		goto out;
 	}
 
+	node = nodes;
 	list_for_each_entry(nd, &sp->members, list) {
-		ids[i++] = nd->nodeid;
-		if (nd->new)
-			new_count++;
-	}
-
-	if (ids_count != i)
-		printk(KERN_ERR "dlm: bad nodeid count %d %d\n", ids_count, i);
-
-	if (!new_count)
-		goto out_ids;
+		node->nodeid = nd->nodeid;
+		node->weight = nd->weight;
+		node->new = nd->new;
+		node->comm_seq = nd->comm_seq;
+		node++;
 
-	new = kcalloc(new_count, sizeof(int), GFP_NOFS);
-	if (!new) {
-		kfree(ids);
-		rv = -ENOMEM;
-		goto out;
+		nd->new = 0;
 	}
 
-	i = 0;
-	list_for_each_entry(nd, &sp->members, list) {
-		if (nd->new) {
-			new[i++] = nd->nodeid;
-			nd->new = 0;
-		}
-	}
-	*new_count_out = new_count;
-	*new_out = new;
-
- out_ids:
-	*ids_count_out = ids_count;
-	*ids_out = ids;
+	*count_out = count;
+	*nodes_out = nodes;
+	rv = 0;
  out:
 	mutex_unlock(&sp->members_lock);
 	put_space(sp);
 	return rv;
 }
 
-int dlm_node_weight(char *lsname, int nodeid)
+int dlm_comm_seq(int nodeid, uint32_t *seq)
 {
-	struct dlm_space *sp;
-	struct dlm_node *nd;
-	int w = -EEXIST;
-
-	sp = get_space(lsname);
-	if (!sp)
-		goto out;
-
-	mutex_lock(&sp->members_lock);
-	list_for_each_entry(nd, &sp->members, list) {
-		if (nd->nodeid != nodeid)
-			continue;
-		w = nd->weight;
-		break;
-	}
-	mutex_unlock(&sp->members_lock);
-	put_space(sp);
- out:
-	return w;
+	struct dlm_comm *cm = get_comm(nodeid, NULL);
+	if (!cm)
+		return -EEXIST;
+	*seq = cm->seq;
+	put_comm(cm);
+	return 0;
 }
 
 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
@@ -1047,6 +1059,8 @@ int dlm_our_addr(struct sockaddr_storage *addr, int num)
 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
 #define DEFAULT_WAITWARN_US	   0
 #define DEFAULT_NEW_RSB_COUNT    128
+#define DEFAULT_RECOVER_CALLBACKS  0
+#define DEFAULT_CLUSTER_NAME      ""
 
 struct dlm_config_info dlm_config = {
 	.ci_tcp_port = DEFAULT_TCP_PORT,
@@ -1060,6 +1074,8 @@ struct dlm_config_info dlm_config = {
 	.ci_protocol = DEFAULT_PROTOCOL,
 	.ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
 	.ci_waitwarn_us = DEFAULT_WAITWARN_US,
-	.ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT
+	.ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
+	.ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
+	.ci_cluster_name = DEFAULT_CLUSTER_NAME
 };
 
diff --git a/fs/dlm/config.h b/fs/dlm/config.h
index 3099d0dd26c..9f5e3663bb0 100644
--- a/fs/dlm/config.h
+++ b/fs/dlm/config.h
@@ -2,7 +2,7 @@
 *******************************************************************************
 **
 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
-**  Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
+**  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
 **
 **  This copyrighted material is made available to anyone wishing to use,
 **  modify, copy, or redistribute it subject to the terms and conditions
@@ -14,6 +14,13 @@
 #ifndef __CONFIG_DOT_H__
 #define __CONFIG_DOT_H__
 
+struct dlm_config_node {
+	int nodeid;
+	int weight;
+	int new;
+	uint32_t comm_seq;
+};
+
 #define DLM_MAX_ADDR_COUNT 3
 
 struct dlm_config_info {
@@ -29,15 +36,17 @@ struct dlm_config_info {
 	int ci_timewarn_cs;
 	int ci_waitwarn_us;
 	int ci_new_rsb_count;
+	int ci_recover_callbacks;
+	char ci_cluster_name[DLM_LOCKSPACE_LEN];
 };
 
 extern struct dlm_config_info dlm_config;
 
 int dlm_config_init(void);
 void dlm_config_exit(void);
-int dlm_node_weight(char *lsname, int nodeid);
-int dlm_nodeid_list(char *lsname, int **ids_out, int *ids_count_out,
-		    int **new_out, int *new_count_out);
+int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
+		     int *count_out);
+int dlm_comm_seq(int nodeid, uint32_t *seq);
 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr);
 int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid);
 int dlm_our_nodeid(void);
diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index 59779237e2b..3dca2b39e83 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -393,6 +393,7 @@ static const struct seq_operations format3_seq_ops;
 
 static void *table_seq_start(struct seq_file *seq, loff_t *pos)
 {
+	struct rb_node *node;
 	struct dlm_ls *ls = seq->private;
 	struct rsbtbl_iter *ri;
 	struct dlm_rsb *r;
@@ -418,9 +419,10 @@ static void *table_seq_start(struct seq_file *seq, loff_t *pos)
 		ri->format = 3;
 
 	spin_lock(&ls->ls_rsbtbl[bucket].lock);
-	if (!list_empty(&ls->ls_rsbtbl[bucket].list)) {
-		list_for_each_entry(r, &ls->ls_rsbtbl[bucket].list,
-				    res_hashchain) {
+	if (!RB_EMPTY_ROOT(&ls->ls_rsbtbl[bucket].keep)) {
+		for (node = rb_first(&ls->ls_rsbtbl[bucket].keep); node;
+		     node = rb_next(node)) {
+			r = rb_entry(node, struct dlm_rsb, res_hashnode);
 			if (!entry--) {
 				dlm_hold_rsb(r);
 				ri->rsb = r;
@@ -449,9 +451,9 @@ static void *table_seq_start(struct seq_file *seq, loff_t *pos)
 		}
 
 		spin_lock(&ls->ls_rsbtbl[bucket].lock);
-		if (!list_empty(&ls->ls_rsbtbl[bucket].list)) {
-			r = list_first_entry(&ls->ls_rsbtbl[bucket].list,
-					     struct dlm_rsb, res_hashchain);
+		if (!RB_EMPTY_ROOT(&ls->ls_rsbtbl[bucket].keep)) {
+			node = rb_first(&ls->ls_rsbtbl[bucket].keep);
+			r = rb_entry(node, struct dlm_rsb, res_hashnode);
 			dlm_hold_rsb(r);
 			ri->rsb = r;
 			ri->bucket = bucket;
@@ -467,7 +469,7 @@ static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos)
 {
 	struct dlm_ls *ls = seq->private;
 	struct rsbtbl_iter *ri = iter_ptr;
-	struct list_head *next;
+	struct rb_node *next;
 	struct dlm_rsb *r, *rp;
 	loff_t n = *pos;
 	unsigned bucket;
@@ -480,10 +482,10 @@ static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos)
 
 	spin_lock(&ls->ls_rsbtbl[bucket].lock);
 	rp = ri->rsb;
-	next = rp->res_hashchain.next;
+	next = rb_next(&rp->res_hashnode);
 
-	if (next != &ls->ls_rsbtbl[bucket].list) {
-		r = list_entry(next, struct dlm_rsb, res_hashchain);
+	if (next) {
+		r = rb_entry(next, struct dlm_rsb, res_hashnode);
 		dlm_hold_rsb(r);
 		ri->rsb = r;
 		spin_unlock(&ls->ls_rsbtbl[bucket].lock);
@@ -511,9 +513,9 @@ static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos)
 		}
 
 		spin_lock(&ls->ls_rsbtbl[bucket].lock);
-		if (!list_empty(&ls->ls_rsbtbl[bucket].list)) {
-			r = list_first_entry(&ls->ls_rsbtbl[bucket].list,
-					     struct dlm_rsb, res_hashchain);
+		if (!RB_EMPTY_ROOT(&ls->ls_rsbtbl[bucket].keep)) {
+			next = rb_first(&ls->ls_rsbtbl[bucket].keep);
+			r = rb_entry(next, struct dlm_rsb, res_hashnode);
 			dlm_hold_rsb(r);
 			ri->rsb = r;
 			ri->bucket = bucket;
diff --git a/fs/dlm/dir.c b/fs/dlm/dir.c
index 7b84c1dbc82..83641574b01 100644
--- a/fs/dlm/dir.c
+++ b/fs/dlm/dir.c
@@ -290,7 +290,6 @@ int dlm_recover_directory(struct dlm_ls *ls)
 
  out_status:
 	error = 0;
-	dlm_set_recover_status(ls, DLM_RS_DIR);
 	log_debug(ls, "dlm_recover_directory %d entries", count);
  out_free:
 	kfree(last_name);
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index fe2860c0244..3a564d197e9 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -2,7 +2,7 @@
 *******************************************************************************
 **
 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
-**  Copyright (C) 2004-2010 Red Hat, Inc.  All rights reserved.
+**  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
 **
 **  This copyrighted material is made available to anyone wishing to use,
 **  modify, copy, or redistribute it subject to the terms and conditions
@@ -103,8 +103,8 @@ struct dlm_dirtable {
 };
 
 struct dlm_rsbtable {
-	struct list_head	list;
-	struct list_head	toss;
+	struct rb_root		keep;
+	struct rb_root		toss;
 	spinlock_t		lock;
 };
 
@@ -117,6 +117,10 @@ struct dlm_member {
 	struct list_head	list;
 	int			nodeid;
 	int			weight;
+	int			slot;
+	int			slot_prev;
+	int			comm_seq;
+	uint32_t		generation;
 };
 
 /*
@@ -125,10 +129,8 @@ struct dlm_member {
 
 struct dlm_recover {
 	struct list_head	list;
-	int			*nodeids;   /* nodeids of all members */
-	int			node_count;
-	int			*new;       /* nodeids of new members */
-	int			new_count;
+	struct dlm_config_node	*nodes;
+	int			nodes_count;
 	uint64_t		seq;
 };
 
@@ -285,7 +287,10 @@ struct dlm_rsb {
 	unsigned long		res_toss_time;
 	uint32_t		res_first_lkid;
 	struct list_head	res_lookup;	/* lkbs waiting on first */
-	struct list_head	res_hashchain;	/* rsbtbl */
+	union {
+		struct list_head	res_hashchain;
+		struct rb_node		res_hashnode;	/* rsbtbl */
+	};
 	struct list_head	res_grantqueue;
 	struct list_head	res_convertqueue;
 	struct list_head	res_waitqueue;
@@ -334,7 +339,9 @@ static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
 /* dlm_header is first element of all structs sent between nodes */
 
 #define DLM_HEADER_MAJOR	0x00030000
-#define DLM_HEADER_MINOR	0x00000000
+#define DLM_HEADER_MINOR	0x00000001
+
+#define DLM_HEADER_SLOTS	0x00000001
 
 #define DLM_MSG			1
 #define DLM_RCOM		2
@@ -422,10 +429,34 @@ union dlm_packet {
 	struct dlm_rcom		rcom;
 };
 
+#define DLM_RSF_NEED_SLOTS	0x00000001
+
+/* RCOM_STATUS data */
+struct rcom_status {
+	__le32			rs_flags;
+	__le32			rs_unused1;
+	__le64			rs_unused2;
+};
+
+/* RCOM_STATUS_REPLY data */
 struct rcom_config {
 	__le32			rf_lvblen;
 	__le32			rf_lsflags;
-	__le64			rf_unused;
+
+	/* DLM_HEADER_SLOTS adds: */
+	__le32			rf_flags;
+	__le16			rf_our_slot;
+	__le16			rf_num_slots;
+	__le32			rf_generation;
+	__le32			rf_unused1;
+	__le64			rf_unused2;
+};
+
+struct rcom_slot {
+	__le32			ro_nodeid;
+	__le16			ro_slot;
+	__le16			ro_unused1;
+	__le64			ro_unused2;
 };
 
 struct rcom_lock {
@@ -452,6 +483,7 @@ struct dlm_ls {
 	struct list_head	ls_list;	/* list of lockspaces */
 	dlm_lockspace_t		*ls_local_handle;
 	uint32_t		ls_global_id;	/* global unique lockspace ID */
+	uint32_t		ls_generation;
 	uint32_t		ls_exflags;
 	int			ls_lvblen;
 	int			ls_count;	/* refcount of processes in
@@ -490,6 +522,11 @@ struct dlm_ls {
 	int			ls_total_weight;
 	int			*ls_node_array;
 
+	int			ls_slot;
+	int			ls_num_slots;
+	int			ls_slots_size;
+	struct dlm_slot		*ls_slots;
+
 	struct dlm_rsb		ls_stub_rsb;	/* for returning errors */
 	struct dlm_lkb		ls_stub_lkb;	/* for returning errors */
 	struct dlm_message	ls_stub_ms;	/* for faking a reply */
@@ -537,6 +574,9 @@ struct dlm_ls {
 	struct list_head	ls_root_list;	/* root resources */
 	struct rw_semaphore	ls_root_sem;	/* protect root_list */
 
+	const struct dlm_lockspace_ops *ls_ops;
+	void			*ls_ops_arg;
+
 	int			ls_namelen;
 	char			ls_name[1];
 };
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 83b5e32514e..d47183043c5 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -56,6 +56,7 @@
    L: receive_xxxx_reply()     <-  R: send_xxxx_reply()
 */
 #include <linux/types.h>
+#include <linux/rbtree.h>
 #include <linux/slab.h>
 #include "dlm_internal.h"
 #include <linux/dlm_device.h>
@@ -380,6 +381,8 @@ static int get_rsb_struct(struct dlm_ls *ls, char *name, int len,
 
 	r = list_first_entry(&ls->ls_new_rsb, struct dlm_rsb, res_hashchain);
 	list_del(&r->res_hashchain);
+	/* Convert the empty list_head to a NULL rb_node for tree usage: */
+	memset(&r->res_hashnode, 0, sizeof(struct rb_node));
 	ls->ls_new_rsb_count--;
 	spin_unlock(&ls->ls_new_rsb_spin);
 
@@ -388,7 +391,6 @@ static int get_rsb_struct(struct dlm_ls *ls, char *name, int len,
 	memcpy(r->res_name, name, len);
 	mutex_init(&r->res_mutex);
 
-	INIT_LIST_HEAD(&r->res_hashchain);
 	INIT_LIST_HEAD(&r->res_lookup);
 	INIT_LIST_HEAD(&r->res_grantqueue);
 	INIT_LIST_HEAD(&r->res_convertqueue);
@@ -400,14 +402,31 @@ static int get_rsb_struct(struct dlm_ls *ls, char *name, int len,
 	return 0;
 }
 
-static int search_rsb_list(struct list_head *head, char *name, int len,
+static int rsb_cmp(struct dlm_rsb *r, const char *name, int nlen)
+{
+	char maxname[DLM_RESNAME_MAXLEN];
+
+	memset(maxname, 0, DLM_RESNAME_MAXLEN);
+	memcpy(maxname, name, nlen);
+	return memcmp(r->res_name, maxname, DLM_RESNAME_MAXLEN);
+}
+
+static int search_rsb_tree(struct rb_root *tree, char *name, int len,
 			   unsigned int flags, struct dlm_rsb **r_ret)
 {
+	struct rb_node *node = tree->rb_node;
 	struct dlm_rsb *r;
 	int error = 0;
-
-	list_for_each_entry(r, head, res_hashchain) {
-		if (len == r->res_length && !memcmp(name, r->res_name, len))
+	int rc;
+
+	while (node) {
+		r = rb_entry(node, struct dlm_rsb, res_hashnode);
+		rc = rsb_cmp(r, name, len);
+		if (rc < 0)
+			node = node->rb_left;
+		else if (rc > 0)
+			node = node->rb_right;
+		else
 			goto found;
 	}
 	*r_ret = NULL;
@@ -420,22 +439,54 @@ static int search_rsb_list(struct list_head *head, char *name, int len,
 	return error;
 }
 
+static int rsb_insert(struct dlm_rsb *rsb, struct rb_root *tree)
+{
+	struct rb_node **newn = &tree->rb_node;
+	struct rb_node *parent = NULL;
+	int rc;
+
+	while (*newn) {
+		struct dlm_rsb *cur = rb_entry(*newn, struct dlm_rsb,
+					       res_hashnode);
+
+		parent = *newn;
+		rc = rsb_cmp(cur, rsb->res_name, rsb->res_length);
+		if (rc < 0)
+			newn = &parent->rb_left;
+		else if (rc > 0)
+			newn = &parent->rb_right;
+		else {
+			log_print("rsb_insert match");
+			dlm_dump_rsb(rsb);
+			dlm_dump_rsb(cur);
+			return -EEXIST;
+		}
+	}
+
+	rb_link_node(&rsb->res_hashnode, parent, newn);
+	rb_insert_color(&rsb->res_hashnode, tree);
+	return 0;
+}
+
 static int _search_rsb(struct dlm_ls *ls, char *name, int len, int b,
 		       unsigned int flags, struct dlm_rsb **r_ret)
 {
 	struct dlm_rsb *r;
 	int error;
 
-	error = search_rsb_list(&ls->ls_rsbtbl[b].list, name, len, flags, &r);
+	error = search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, flags, &r);
 	if (!error) {
 		kref_get(&r->res_ref);
 		goto out;
 	}
-	error = search_rsb_list(&ls->ls_rsbtbl[b].toss, name, len, flags, &r);
+	error = search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, flags, &r);
 	if (error)
 		goto out;
 
-	list_move(&r->res_hashchain, &ls->ls_rsbtbl[b].list);
+	rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss);
+	error = rsb_insert(r, &ls->ls_rsbtbl[b].keep);
+	if (error)
+		return error;
 
 	if (dlm_no_directory(ls))
 		goto out;
@@ -527,8 +578,7 @@ static int find_rsb(struct dlm_ls *ls, char *name, int namelen,
 			nodeid = 0;
 		r->res_nodeid = nodeid;
 	}
-	list_add(&r->res_hashchain, &ls->ls_rsbtbl[bucket].list);
-	error = 0;
+	error = rsb_insert(r, &ls->ls_rsbtbl[bucket].keep);
  out_unlock:
 	spin_unlock(&ls->ls_rsbtbl[bucket].lock);
  out:
@@ -556,7 +606,8 @@ static void toss_rsb(struct kref *kref)
 
 	DLM_ASSERT(list_empty(&r->res_root_list), dlm_print_rsb(r););
 	kref_init(&r->res_ref);
-	list_move(&r->res_hashchain, &ls->ls_rsbtbl[r->res_bucket].toss);
+	rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[r->res_bucket].keep);
+	rsb_insert(r, &ls->ls_rsbtbl[r->res_bucket].toss);
 	r->res_toss_time = jiffies;
 	if (r->res_lvbptr) {
 		dlm_free_lvb(r->res_lvbptr);
@@ -1082,19 +1133,19 @@ static void dir_remove(struct dlm_rsb *r)
 				     r->res_name, r->res_length);
 }
 
-/* FIXME: shouldn't this be able to exit as soon as one non-due rsb is
-   found since they are in order of newest to oldest? */
+/* FIXME: make this more efficient */
 
 static int shrink_bucket(struct dlm_ls *ls, int b)
 {
+	struct rb_node *n;
 	struct dlm_rsb *r;
 	int count = 0, found;
 
 	for (;;) {
 		found = 0;
 		spin_lock(&ls->ls_rsbtbl[b].lock);
-		list_for_each_entry_reverse(r, &ls->ls_rsbtbl[b].toss,
-					    res_hashchain) {
+		for (n = rb_first(&ls->ls_rsbtbl[b].toss); n; n = rb_next(n)) {
+			r = rb_entry(n, struct dlm_rsb, res_hashnode);
 			if (!time_after_eq(jiffies, r->res_toss_time +
 					   dlm_config.ci_toss_secs * HZ))
 				continue;
@@ -1108,7 +1159,7 @@ static int shrink_bucket(struct dlm_ls *ls, int b)
 		}
 
 		if (kref_put(&r->res_ref, kill_rsb)) {
-			list_del(&r->res_hashchain);
+			rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss);
 			spin_unlock(&ls->ls_rsbtbl[b].lock);
 
 			if (is_master(r))
@@ -4441,10 +4492,12 @@ int dlm_purge_locks(struct dlm_ls *ls)
 
 static struct dlm_rsb *find_purged_rsb(struct dlm_ls *ls, int bucket)
 {
+	struct rb_node *n;
 	struct dlm_rsb *r, *r_ret = NULL;
 
 	spin_lock(&ls->ls_rsbtbl[bucket].lock);
-	list_for_each_entry(r, &ls->ls_rsbtbl[bucket].list, res_hashchain) {
+	for (n = rb_first(&ls->ls_rsbtbl[bucket].keep); n; n = rb_next(n)) {
+		r = rb_entry(n, struct dlm_rsb, res_hashnode);
 		if (!rsb_flag(r, RSB_LOCKS_PURGED))
 			continue;
 		hold_rsb(r);
diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c
index a1d8f1af144..a1ea25face8 100644
--- a/fs/dlm/lockspace.c
+++ b/fs/dlm/lockspace.c
@@ -2,7 +2,7 @@
 *******************************************************************************
 **
 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
-**  Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
+**  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
 **
 **  This copyrighted material is made available to anyone wishing to use,
 **  modify, copy, or redistribute it subject to the terms and conditions
@@ -386,12 +386,15 @@ static void threads_stop(void)
 	dlm_lowcomms_stop();
 }
 
-static int new_lockspace(const char *name, int namelen, void **lockspace,
-			 uint32_t flags, int lvblen)
+static int new_lockspace(const char *name, const char *cluster,
+			 uint32_t flags, int lvblen,
+			 const struct dlm_lockspace_ops *ops, void *ops_arg,
+			 int *ops_result, dlm_lockspace_t **lockspace)
 {
 	struct dlm_ls *ls;
 	int i, size, error;
 	int do_unreg = 0;
+	int namelen = strlen(name);
 
 	if (namelen > DLM_LOCKSPACE_LEN)
 		return -EINVAL;
@@ -403,8 +406,24 @@ static int new_lockspace(const char *name, int namelen, void **lockspace,
 		return -EINVAL;
 
 	if (!dlm_user_daemon_available()) {
-		module_put(THIS_MODULE);
-		return -EUNATCH;
+		log_print("dlm user daemon not available");
+		error = -EUNATCH;
+		goto out;
+	}
+
+	if (ops && ops_result) {
+	       	if (!dlm_config.ci_recover_callbacks)
+			*ops_result = -EOPNOTSUPP;
+		else
+			*ops_result = 0;
+	}
+
+	if (dlm_config.ci_recover_callbacks && cluster &&
+	    strncmp(cluster, dlm_config.ci_cluster_name, DLM_LOCKSPACE_LEN)) {
+		log_print("dlm cluster name %s mismatch %s",
+			  dlm_config.ci_cluster_name, cluster);
+		error = -EBADR;
+		goto out;
 	}
 
 	error = 0;
@@ -442,6 +461,11 @@ static int new_lockspace(const char *name, int namelen, void **lockspace,
 	ls->ls_flags = 0;
 	ls->ls_scan_time = jiffies;
 
+	if (ops && dlm_config.ci_recover_callbacks) {
+		ls->ls_ops = ops;
+		ls->ls_ops_arg = ops_arg;
+	}
+
 	if (flags & DLM_LSFL_TIMEWARN)
 		set_bit(LSFL_TIMEWARN, &ls->ls_flags);
 
@@ -457,8 +481,8 @@ static int new_lockspace(const char *name, int namelen, void **lockspace,
 	if (!ls->ls_rsbtbl)
 		goto out_lsfree;
 	for (i = 0; i < size; i++) {
-		INIT_LIST_HEAD(&ls->ls_rsbtbl[i].list);
-		INIT_LIST_HEAD(&ls->ls_rsbtbl[i].toss);
+		ls->ls_rsbtbl[i].keep.rb_node = NULL;
+		ls->ls_rsbtbl[i].toss.rb_node = NULL;
 		spin_lock_init(&ls->ls_rsbtbl[i].lock);
 	}
 
@@ -525,6 +549,11 @@ static int new_lockspace(const char *name, int namelen, void **lockspace,
 	if (!ls->ls_recover_buf)
 		goto out_dirfree;
 
+	ls->ls_slot = 0;
+	ls->ls_num_slots = 0;
+	ls->ls_slots_size = 0;
+	ls->ls_slots = NULL;
+
 	INIT_LIST_HEAD(&ls->ls_recover_list);
 	spin_lock_init(&ls->ls_recover_list_lock);
 	ls->ls_recover_list_count = 0;
@@ -614,8 +643,10 @@ static int new_lockspace(const char *name, int namelen, void **lockspace,
 	return error;
 }
 
-int dlm_new_lockspace(const char *name, int namelen, void **lockspace,
-		      uint32_t flags, int lvblen)
+int dlm_new_lockspace(const char *name, const char *cluster,
+		      uint32_t flags, int lvblen,
+		      const struct dlm_lockspace_ops *ops, void *ops_arg,
+		      int *ops_result, dlm_lockspace_t **lockspace)
 {
 	int error = 0;
 
@@ -625,7 +656,8 @@ int dlm_new_lockspace(const char *name, int namelen, void **lockspace,
 	if (error)
 		goto out;
 
-	error = new_lockspace(name, namelen, lockspace, flags, lvblen);
+	error = new_lockspace(name, cluster, flags, lvblen, ops, ops_arg,
+			      ops_result, lockspace);
 	if (!error)
 		ls_count++;
 	if (error > 0)
@@ -685,7 +717,7 @@ static int lockspace_busy(struct dlm_ls *ls, int force)
 static int release_lockspace(struct dlm_ls *ls, int force)
 {
 	struct dlm_rsb *rsb;
-	struct list_head *head;
+	struct rb_node *n;
 	int i, busy, rv;
 
 	busy = lockspace_busy(ls, force);
@@ -746,20 +778,15 @@ static int release_lockspace(struct dlm_ls *ls, int force)
 	 */
 
 	for (i = 0; i < ls->ls_rsbtbl_size; i++) {
-		head = &ls->ls_rsbtbl[i].list;
-		while (!list_empty(head)) {
-			rsb = list_entry(head->next, struct dlm_rsb,
-					 res_hashchain);
-
-			list_del(&rsb->res_hashchain);
+		while ((n = rb_first(&ls->ls_rsbtbl[i].keep))) {
+			rsb = rb_entry(n, struct dlm_rsb, res_hashnode);
+			rb_erase(n, &ls->ls_rsbtbl[i].keep);
 			dlm_free_rsb(rsb);
 		}
 
-		head = &ls->ls_rsbtbl[i].toss;
-		while (!list_empty(head)) {
-			rsb = list_entry(head->next, struct dlm_rsb,
-					 res_hashchain);
-			list_del(&rsb->res_hashchain);
+		while ((n = rb_first(&ls->ls_rsbtbl[i].toss))) {
+			rsb = rb_entry(n, struct dlm_rsb, res_hashnode);
+			rb_erase(n, &ls->ls_rsbtbl[i].toss);
 			dlm_free_rsb(rsb);
 		}
 	}
diff --git a/fs/dlm/member.c b/fs/dlm/member.c
index b12532e553f..862640a36d5 100644
--- a/fs/dlm/member.c
+++ b/fs/dlm/member.c
@@ -1,7 +1,7 @@
 /******************************************************************************
 *******************************************************************************
 **
-**  Copyright (C) 2005-2009 Red Hat, Inc.  All rights reserved.
+**  Copyright (C) 2005-2011 Red Hat, Inc.  All rights reserved.
 **
 **  This copyrighted material is made available to anyone wishing to use,
 **  modify, copy, or redistribute it subject to the terms and conditions
@@ -19,6 +19,280 @@
 #include "config.h"
 #include "lowcomms.h"
 
+int dlm_slots_version(struct dlm_header *h)
+{
+	if ((h->h_version & 0x0000FFFF) < DLM_HEADER_SLOTS)
+		return 0;
+	return 1;
+}
+
+void dlm_slot_save(struct dlm_ls *ls, struct dlm_rcom *rc,
+		   struct dlm_member *memb)
+{
+	struct rcom_config *rf = (struct rcom_config *)rc->rc_buf;
+
+	if (!dlm_slots_version(&rc->rc_header))
+		return;
+
+	memb->slot = le16_to_cpu(rf->rf_our_slot);
+	memb->generation = le32_to_cpu(rf->rf_generation);
+}
+
+void dlm_slots_copy_out(struct dlm_ls *ls, struct dlm_rcom *rc)
+{
+	struct dlm_slot *slot;
+	struct rcom_slot *ro;
+	int i;
+
+	ro = (struct rcom_slot *)(rc->rc_buf + sizeof(struct rcom_config));
+
+	/* ls_slots array is sparse, but not rcom_slots */
+
+	for (i = 0; i < ls->ls_slots_size; i++) {
+		slot = &ls->ls_slots[i];
+		if (!slot->nodeid)
+			continue;
+		ro->ro_nodeid = cpu_to_le32(slot->nodeid);
+		ro->ro_slot = cpu_to_le16(slot->slot);
+		ro++;
+	}
+}
+
+#define SLOT_DEBUG_LINE 128
+
+static void log_debug_slots(struct dlm_ls *ls, uint32_t gen, int num_slots,
+			    struct rcom_slot *ro0, struct dlm_slot *array,
+			    int array_size)
+{
+	char line[SLOT_DEBUG_LINE];
+	int len = SLOT_DEBUG_LINE - 1;
+	int pos = 0;
+	int ret, i;
+
+	if (!dlm_config.ci_log_debug)
+		return;
+
+	memset(line, 0, sizeof(line));
+
+	if (array) {
+		for (i = 0; i < array_size; i++) {
+			if (!array[i].nodeid)
+				continue;
+
+			ret = snprintf(line + pos, len - pos, " %d:%d",
+				       array[i].slot, array[i].nodeid);
+			if (ret >= len - pos)
+				break;
+			pos += ret;
+		}
+	} else if (ro0) {
+		for (i = 0; i < num_slots; i++) {
+			ret = snprintf(line + pos, len - pos, " %d:%d",
+				       ro0[i].ro_slot, ro0[i].ro_nodeid);
+			if (ret >= len - pos)
+				break;
+			pos += ret;
+		}
+	}
+
+	log_debug(ls, "generation %u slots %d%s", gen, num_slots, line);
+}
+
+int dlm_slots_copy_in(struct dlm_ls *ls)
+{
+	struct dlm_member *memb;
+	struct dlm_rcom *rc = ls->ls_recover_buf;
+	struct rcom_config *rf = (struct rcom_config *)rc->rc_buf;
+	struct rcom_slot *ro0, *ro;
+	int our_nodeid = dlm_our_nodeid();