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

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm:
  dlm: linux/{dlm,dlm_device}.h: cleanup for userspace
  dlm: common max length definitions
  dlm: move plock code from gfs2
  dlm: recover nodes that are removed and re-added
  dlm: save master info after failed no-queue request
  dlm: make dlm_print_rsb() static
  dlm: match signedness between dlm_config_info and cluster_set

10 files changed, 526 insertions, 23 deletions

diff --git a/fs/dlm/Makefile b/fs/dlm/Makefile
index d248e60..ca1c912 100644
--- a/fs/dlm/Makefile
+++ b/fs/dlm/Makefile
@@ -10,6 +10,7 @@ dlm-y :=			ast.o \
 				midcomms.o \
 				netlink.o \
 				lowcomms.o \
+				plock.o \
 				rcom.o \
 				recover.o \
 				recoverd.o \
diff --git a/fs/dlm/config.c b/fs/dlm/config.c
index c3ad1df..eac23bd 100644
--- a/fs/dlm/config.c
+++ b/fs/dlm/config.c
@@ -114,7 +114,7 @@ struct cluster_attribute {
 };
 
 static ssize_t cluster_set(struct cluster *cl, unsigned int *cl_field,
-			   unsigned int *info_field, int check_zero,
+			   int *info_field, int check_zero,
 			   const char *buf, size_t len)
 {
 	unsigned int x;
@@ -284,6 +284,7 @@ struct node {
 	struct list_head list; /* space->members */
 	int nodeid;
 	int weight;
+	int new;
 };
 
 static struct configfs_group_operations clusters_ops = {
@@ -565,6 +566,7 @@ static struct config_item *make_node(struct config_group *g, const char *name)
 	config_item_init_type_name(&nd->item, name, &node_type);
 	nd->nodeid = -1;
 	nd->weight = 1;  /* default weight of 1 if none is set */
+	nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 
 	mutex_lock(&sp->members_lock);
 	list_add(&nd->list, &sp->members);
@@ -805,12 +807,13 @@ static void put_comm(struct comm *cm)
 }
 
 /* caller must free mem */
-int dlm_nodeid_list(char *lsname, int **ids_out)
+int dlm_nodeid_list(char *lsname, int **ids_out, int *ids_count_out,
+		    int **new_out, int *new_count_out)
 {
 	struct space *sp;
 	struct node *nd;
-	int i = 0, rv = 0;
-	int *ids;
+	int i = 0, rv = 0, ids_count = 0, new_count = 0;
+	int *ids, *new;
 
 	sp = get_space(lsname);
 	if (!sp)
@@ -818,23 +821,50 @@ int dlm_nodeid_list(char *lsname, int **ids_out)
 
 	mutex_lock(&sp->members_lock);
 	if (!sp->members_count) {
-		rv = 0;
+		rv = -EINVAL;
+		printk(KERN_ERR "dlm: zero members_count\n");
 		goto out;
 	}
 
-	ids = kcalloc(sp->members_count, sizeof(int), GFP_KERNEL);
+	ids_count = sp->members_count;
+
+	ids = kcalloc(ids_count, sizeof(int), GFP_KERNEL);
 	if (!ids) {
 		rv = -ENOMEM;
 		goto out;
 	}
 
-	rv = sp->members_count;
-	list_for_each_entry(nd, &sp->members, list)
+	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;
+
+	new = kcalloc(new_count, sizeof(int), GFP_KERNEL);
+	if (!new) {
+		kfree(ids);
+		rv = -ENOMEM;
+		goto out;
+	}
 
-	if (rv != i)
-		printk("bad nodeid count %d %d\n", rv, i);
+	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;
  out:
 	mutex_unlock(&sp->members_lock);
diff --git a/fs/dlm/config.h b/fs/dlm/config.h
index a3170fe..4f1d6fc 100644
--- a/fs/dlm/config.h
+++ b/fs/dlm/config.h
@@ -35,7 +35,8 @@ 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 dlm_nodeid_list(char *lsname, int **ids_out, int *ids_count_out,
+		    int **new_out, int *new_count_out);
 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/dlm_internal.h b/fs/dlm/dlm_internal.h
index 7a8824f4..5a7ac33 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -42,8 +42,6 @@
 #include <linux/dlm.h>
 #include "config.h"
 
-#define DLM_LOCKSPACE_LEN	64
-
 /* Size of the temp buffer midcomms allocates on the stack.
    We try to make this large enough so most messages fit.
    FIXME: should sctp make this unnecessary? */
@@ -132,8 +130,10 @@ struct dlm_member {
 
 struct dlm_recover {
 	struct list_head	list;
-	int			*nodeids;
+	int			*nodeids;   /* nodeids of all members */
 	int			node_count;
+	int			*new;       /* nodeids of new members */
+	int			new_count;
 	uint64_t		seq;
 };
 
@@ -579,6 +579,8 @@ static inline int dlm_no_directory(struct dlm_ls *ls)
 int dlm_netlink_init(void);
 void dlm_netlink_exit(void);
 void dlm_timeout_warn(struct dlm_lkb *lkb);
+int dlm_plock_init(void);
+void dlm_plock_exit(void);
 
 #ifdef CONFIG_DLM_DEBUG
 int dlm_register_debugfs(void);
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 8f250ac..2d3d102 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -165,7 +165,7 @@ void dlm_print_lkb(struct dlm_lkb *lkb)
 	       lkb->lkb_grmode, lkb->lkb_wait_type, lkb->lkb_ast_type);
 }
 
-void dlm_print_rsb(struct dlm_rsb *r)
+static void dlm_print_rsb(struct dlm_rsb *r)
 {
 	printk(KERN_ERR "rsb: nodeid %d flags %lx first %x rlc %d name %s\n",
 	       r->res_nodeid, r->res_flags, r->res_first_lkid,
@@ -1956,8 +1956,7 @@ static void confirm_master(struct dlm_rsb *r, int error)
 			list_del_init(&lkb->lkb_rsb_lookup);
 			r->res_first_lkid = lkb->lkb_id;
 			_request_lock(r, lkb);
-		} else
-			r->res_nodeid = -1;
+		}
 		break;
 
 	default:
diff --git a/fs/dlm/lock.h b/fs/dlm/lock.h
index 05d9c82..88e93c8 100644
--- a/fs/dlm/lock.h
+++ b/fs/dlm/lock.h
@@ -13,7 +13,6 @@
 #ifndef __LOCK_DOT_H__
 #define __LOCK_DOT_H__
 
-void dlm_print_rsb(struct dlm_rsb *r);
 void dlm_dump_rsb(struct dlm_rsb *r);
 void dlm_print_lkb(struct dlm_lkb *lkb);
 void dlm_receive_message_saved(struct dlm_ls *ls, struct dlm_message *ms);
diff --git a/fs/dlm/main.c b/fs/dlm/main.c
index 58487fb..b80e0aa 100644
--- a/fs/dlm/main.c
+++ b/fs/dlm/main.c
@@ -46,10 +46,16 @@ static int __init init_dlm(void)
 	if (error)
 		goto out_user;
 
+	error = dlm_plock_init();
+	if (error)
+		goto out_netlink;
+
 	printk("DLM (built %s %s) installed\n", __DATE__, __TIME__);
 
 	return 0;
 
+ out_netlink:
+	dlm_netlink_exit();
  out_user:
 	dlm_user_exit();
  out_debug:
@@ -66,6 +72,7 @@ static int __init init_dlm(void)
 
 static void __exit exit_dlm(void)
 {
+	dlm_plock_exit();
 	dlm_netlink_exit();
 	dlm_user_exit();
 	dlm_config_exit();
diff --git a/fs/dlm/member.c b/fs/dlm/member.c
index fa17f5a..26133f0 100644
--- a/fs/dlm/member.c
+++ b/fs/dlm/member.c
@@ -210,6 +210,23 @@ int dlm_recover_members(struct dlm_ls *ls, struct dlm_recover *rv, int *neg_out)
 		}
 	}
 
+	/* Add an entry to ls_nodes_gone for members that were removed and
+	   then added again, so that previous state for these nodes will be
+	   cleared during recovery. */
+
+	for (i = 0; i < rv->new_count; i++) {
+		if (!dlm_is_member(ls, rv->new[i]))
+			continue;
+		log_debug(ls, "new nodeid %d is a re-added member", rv->new[i]);
+
+		memb = kzalloc(sizeof(struct dlm_member), GFP_KERNEL);
+		if (!memb)
+			return -ENOMEM;
+		memb->nodeid = rv->new[i];
+		list_add_tail(&memb->list, &ls->ls_nodes_gone);
+		neg++;
+	}
+
 	/* add new members to ls_nodes */
 
 	for (i = 0; i < rv->node_count; i++) {
@@ -314,15 +331,16 @@ int dlm_ls_stop(struct dlm_ls *ls)
 int dlm_ls_start(struct dlm_ls *ls)
 {
 	struct dlm_recover *rv = NULL, *rv_old;
-	int *ids = NULL;
-	int error, count;
+	int *ids = NULL, *new = NULL;
+	int error, ids_count = 0, new_count = 0;
 
 	rv = kzalloc(sizeof(struct dlm_recover), GFP_KERNEL);
 	if (!rv)
 		return -ENOMEM;
 
-	error = count = dlm_nodeid_list(ls->ls_name, &ids);
-	if (error <= 0)
+	error = dlm_nodeid_list(ls->ls_name, &ids, &ids_count,
+				&new, &new_count);
+	if (error < 0)
 		goto fail;
 
 	spin_lock(&ls->ls_recover_lock);
@@ -337,14 +355,19 @@ int dlm_ls_start(struct dlm_ls *ls)
 	}
 
 	rv->nodeids = ids;
-	rv->node_count = count;
+	rv->node_count = ids_count;
+	rv->new = new;
+	rv->new_count = new_count;
 	rv->seq = ++ls->ls_recover_seq;
 	rv_old = ls->ls_recover_args;
 	ls->ls_recover_args = rv;
 	spin_unlock(&ls->ls_recover_lock);
 
 	if (rv_old) {
+		log_error(ls, "unused recovery %llx %d",
+			  (unsigned long long)rv_old->seq, rv_old->node_count);
 		kfree(rv_old->nodeids);
+		kfree(rv_old->new);
 		kfree(rv_old);
 	}
 
@@ -354,6 +377,7 @@ int dlm_ls_start(struct dlm_ls *ls)
  fail:
 	kfree(rv);
 	kfree(ids);
+	kfree(new);
 	return error;
 }
 
diff --git a/fs/dlm/plock.c b/fs/dlm/plock.c
new file mode 100644
index 0000000..d6d6e37
--- /dev/null
+++ b/fs/dlm/plock.c
@@ -0,0 +1,439 @@
+/*
+ * Copyright (C) 2005-2008 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
+ * of the GNU General Public License version 2.
+ */
+
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/poll.h>
+#include <linux/dlm.h>
+#include <linux/dlm_plock.h>
+
+#include "dlm_internal.h"
+#include "lockspace.h"
+
+static spinlock_t ops_lock;
+static struct list_head send_list;
+static struct list_head recv_list;
+static wait_queue_head_t send_wq;
+static wait_queue_head_t recv_wq;
+
+struct plock_op {
+	struct list_head list;
+	int done;
+	struct dlm_plock_info info;
+};
+
+struct plock_xop {
+	struct plock_op xop;
+	void *callback;
+	void *fl;
+	void *file;
+	struct file_lock flc;
+};
+
+
+static inline void set_version(struct dlm_plock_info *info)
+{
+	info->version[0] = DLM_PLOCK_VERSION_MAJOR;
+	info->version[1] = DLM_PLOCK_VERSION_MINOR;
+	info->version[2] = DLM_PLOCK_VERSION_PATCH;
+}
+
+static int check_version(struct dlm_plock_info *info)
+{
+	if ((DLM_PLOCK_VERSION_MAJOR != info->version[0]) ||
+	    (DLM_PLOCK_VERSION_MINOR < info->version[1])) {
+		log_print("plock device version mismatch: "
+			  "kernel (%u.%u.%u), user (%u.%u.%u)",
+			  DLM_PLOCK_VERSION_MAJOR,
+			  DLM_PLOCK_VERSION_MINOR,
+			  DLM_PLOCK_VERSION_PATCH,
+			  info->version[0],
+			  info->version[1],
+			  info->version[2]);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static void send_op(struct plock_op *op)
+{
+	set_version(&op->info);
+	INIT_LIST_HEAD(&op->list);
+	spin_lock(&ops_lock);
+	list_add_tail(&op->list, &send_list);
+	spin_unlock(&ops_lock);
+	wake_up(&send_wq);
+}
+
+int dlm_posix_lock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
+		   int cmd, struct file_lock *fl)
+{
+	struct dlm_ls *ls;
+	struct plock_op *op;
+	struct plock_xop *xop;
+	int rv;
+
+	ls = dlm_find_lockspace_local(lockspace);
+	if (!ls)
+		return -EINVAL;
+
+	xop = kzalloc(sizeof(*xop), GFP_KERNEL);
+	if (!xop) {
+		rv = -ENOMEM;
+		goto out;
+	}
+
+	op = &xop->xop;
+	op->info.optype		= DLM_PLOCK_OP_LOCK;
+	op->info.pid		= fl->fl_pid;
+	op->info.ex		= (fl->fl_type == F_WRLCK);
+	op->info.wait		= IS_SETLKW(cmd);
+	op->info.fsid		= ls->ls_global_id;
+	op->info.number		= number;
+	op->info.start		= fl->fl_start;
+	op->info.end		= fl->fl_end;
+	if (fl->fl_lmops && fl->fl_lmops->fl_grant) {
+		/* fl_owner is lockd which doesn't distinguish
+		   processes on the nfs client */
+		op->info.owner	= (__u64) fl->fl_pid;
+		xop->callback	= fl->fl_lmops->fl_grant;
+		locks_init_lock(&xop->flc);
+		locks_copy_lock(&xop->flc, fl);
+		xop->fl		= fl;
+		xop->file	= file;
+	} else {
+		op->info.owner	= (__u64)(long) fl->fl_owner;
+		xop->callback	= NULL;
+	}
+
+	send_op(op);
+
+	if (xop->callback == NULL)
+		wait_event(recv_wq, (op->done != 0));
+	else {
+		rv = -EINPROGRESS;
+		goto out;
+	}
+
+	spin_lock(&ops_lock);
+	if (!list_empty(&op->list)) {
+		log_error(ls, "dlm_posix_lock: op on list %llx",
+			  (unsigned long long)number);
+		list_del(&op->list);
+	}
+	spin_unlock(&ops_lock);
+
+	rv = op->info.rv;
+
+	if (!rv) {
+		if (posix_lock_file_wait(file, fl) < 0)
+			log_error(ls, "dlm_posix_lock: vfs lock error %llx",
+				  (unsigned long long)number);
+	}
+
+	kfree(xop);
+out:
+	dlm_put_lockspace(ls);
+	return rv;
+}
+EXPORT_SYMBOL_GPL(dlm_posix_lock);
+
+/* Returns failure iff a succesful lock operation should be canceled */
+static int dlm_plock_callback(struct plock_op *op)
+{
+	struct file *file;
+	struct file_lock *fl;
+	struct file_lock *flc;
+	int (*notify)(void *, void *, int) = NULL;
+	struct plock_xop *xop = (struct plock_xop *)op;
+	int rv = 0;
+
+	spin_lock(&ops_lock);
+	if (!list_empty(&op->list)) {
+		log_print("dlm_plock_callback: op on list %llx",
+			  (unsigned long long)op->info.number);
+		list_del(&op->list);
+	}
+	spin_unlock(&ops_lock);
+
+	/* check if the following 2 are still valid or make a copy */
+	file = xop->file;
+	flc = &xop->flc;
+	fl = xop->fl;
+	notify = xop->callback;
+
+	if (op->info.rv) {
+		notify(flc, NULL, op->info.rv);
+		goto out;
+	}
+
+	/* got fs lock; bookkeep locally as well: */
+	flc->fl_flags &= ~FL_SLEEP;
+	if (posix_lock_file(file, flc, NULL)) {
+		/*
+		 * This can only happen in the case of kmalloc() failure.
+		 * The filesystem's own lock is the authoritative lock,
+		 * so a failure to get the lock locally is not a disaster.
+		 * As long as the fs cannot reliably cancel locks (especially
+		 * in a low-memory situation), we're better off ignoring
+		 * this failure than trying to recover.
+		 */
+		log_print("dlm_plock_callback: vfs lock error %llx file %p fl %p",
+			  (unsigned long long)op->info.number, file, fl);
+	}
+
+	rv = notify(flc, NULL, 0);
+	if (rv) {
+		/* XXX: We need to cancel the fs lock here: */
+		log_print("dlm_plock_callback: lock granted after lock request "
+			  "failed; dangling lock!\n");
+		goto out;
+	}
+
+out:
+	kfree(xop);
+	return rv;
+}
+
+int dlm_posix_unlock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
+		     struct file_lock *fl)
+{
+	struct dlm_ls *ls;
+	struct plock_op *op;
+	int rv;
+
+	ls = dlm_find_lockspace_local(lockspace);
+	if (!ls)
+		return -EINVAL;
+
+	op = kzalloc(sizeof(*op), GFP_KERNEL);
+	if (!op) {
+		rv = -ENOMEM;
+		goto out;
+	}
+
+	if (posix_lock_file_wait(file, fl) < 0)
+		log_error(ls, "dlm_posix_unlock: vfs unlock error %llx",
+			  (unsigned long long)number);
+
+	op->info.optype		= DLM_PLOCK_OP_UNLOCK;
+	op->info.pid		= fl->fl_pid;
+	op->info.fsid		= ls->ls_global_id;
+	op->info.number		= number;
+	op->info.start		= fl->fl_start;
+	op->info.end		= fl->fl_end;
+	if (fl->fl_lmops && fl->fl_lmops->fl_grant)
+		op->info.owner	= (__u64) fl->fl_pid;
+	else
+		op->info.owner	= (__u64)(long) fl->fl_owner;
+
+	send_op(op);
+	wait_event(recv_wq, (op->done != 0));
+
+	spin_lock(&ops_lock);
+	if (!list_empty(&op->list)) {
+		log_error(ls, "dlm_posix_unlock: op on list %llx",
+			  (unsigned long long)number);
+		list_del(&op->list);
+	}
+	spin_unlock(&ops_lock);
+
+	rv = op->info.rv;
+
+	if (rv == -ENOENT)
+		rv = 0;
+
+	kfree(op);
+out:
+	dlm_put_lockspace(ls);
+	return rv;
+}
+EXPORT_SYMBOL_GPL(dlm_posix_unlock);
+
+int dlm_posix_get(dlm_lockspace_t *lockspace, u64 number, struct file *file,
+		  struct file_lock *fl)
+{
+	struct dlm_ls *ls;
+	struct plock_op *op;
+	int rv;
+
+	ls = dlm_find_lockspace_local(lockspace);
+	if (!ls)
+		return -EINVAL;
+
+	op = kzalloc(sizeof(*op), GFP_KERNEL);
+	if (!op) {
+		rv = -ENOMEM;
+		goto out;
+	}
+
+	op->info.optype		= DLM_PLOCK_OP_GET;
+	op->info.pid		= fl->fl_pid;
+	op->info.ex		= (fl->fl_type == F_WRLCK);
+	op->info.fsid		= ls->ls_global_id;
+	op->info.number		= number;
+	op->info.start		= fl->fl_start;
+	op->info.end		= fl->fl_end;
+	if (fl->fl_lmops && fl->fl_lmops->fl_grant)
+		op->info.owner	= (__u64) fl->fl_pid;
+	else
+		op->info.owner	= (__u64)(long) fl->fl_owner;
+
+	send_op(op);
+	wait_event(recv_wq, (op->done != 0));
+
+	spin_lock(&ops_lock);
+	if (!list_empty(&op->list)) {
+		log_error(ls, "dlm_posix_get: op on list %llx",
+			  (unsigned long long)number);
+		list_del(&op->list);
+	}
+	spin_unlock(&ops_lock);
+
+	/* info.rv from userspace is 1 for conflict, 0 for no-conflict,
+	   -ENOENT if there are no locks on the file */
+
+	rv = op->info.rv;
+
+	fl->fl_type = F_UNLCK;
+	if (rv == -ENOENT)
+		rv = 0;
+	else if (rv > 0) {
+		fl->fl_type = (op->info.ex) ? F_WRLCK : F_RDLCK;
+		fl->fl_pid = op->info.pid;
+		fl->fl_start = op->info.start;
+		fl->fl_end = op->info.end;
+		rv = 0;
+	}
+
+	kfree(op);
+out:
+	dlm_put_lockspace(ls);
+	return rv;
+}
+EXPORT_SYMBOL_GPL(dlm_posix_get);
+
+/* a read copies out one plock request from the send list */
+static ssize_t dev_read(struct file *file, char __user *u, size_t count,
+			loff_t *ppos)
+{
+	struct dlm_plock_info info;
+	struct plock_op *op = NULL;
+
+	if (count < sizeof(info))
+		return -EINVAL;
+
+	spin_lock(&ops_lock);
+	if (!list_empty(&send_list)) {
+		op = list_entry(send_list.next, struct plock_op, list);
+		list_move(&op->list, &recv_list);
+		memcpy(&info, &op->info, sizeof(info));
+	}
+	spin_unlock(&ops_lock);
+
+	if (!op)
+		return -EAGAIN;
+
+	if (copy_to_user(u, &info, sizeof(info)))
+		return -EFAULT;
+	return sizeof(info);
+}
+
+/* a write copies in one plock result that should match a plock_op
+   on the recv list */
+static ssize_t dev_write(struct file *file, const char __user *u, size_t count,
+			 loff_t *ppos)
+{
+	struct dlm_plock_info info;
+	struct plock_op *op;
+	int found = 0;
+
+	if (count != sizeof(info))
+		return -EINVAL;
+
+	if (copy_from_user(&info, u, sizeof(info)))
+		return -EFAULT;
+
+	if (check_version(&info))
+		return -EINVAL;
+
+	spin_lock(&ops_lock);
+	list_for_each_entry(op, &recv_list, list) {
+		if (op->info.fsid == info.fsid && op->info.number == info.number &&
+		    op->info.owner == info.owner) {
+			list_del_init(&op->list);
+			found = 1;
+			op->done = 1;
+			memcpy(&op->info, &info, sizeof(info));
+			break;
+		}
+	}
+	spin_unlock(&ops_lock);
+
+	if (found) {
+		struct plock_xop *xop;
+		xop = (struct plock_xop *)op;
+		if (xop->callback)
+			count = dlm_plock_callback(op);
+		else
+			wake_up(&recv_wq);
+	} else
+		log_print("dev_write no op %x %llx", info.fsid,
+			  (unsigned long long)info.number);
+	return count;
+}
+
+static unsigned int dev_poll(struct file *file, poll_table *wait)
+{
+	unsigned int mask = 0;
+
+	poll_wait(file, &send_wq, wait);
+
+	spin_lock(&ops_lock);
+	if (!list_empty(&send_list))
+		mask = POLLIN | POLLRDNORM;
+	spin_unlock(&ops_lock);
+
+	return mask;
+}
+
+static const struct file_operations dev_fops = {
+	.read    = dev_read,
+	.write   = dev_write,
+	.poll    = dev_poll,
+	.owner   = THIS_MODULE
+};
+
+static struct miscdevice plock_dev_misc = {
+	.minor = MISC_DYNAMIC_MINOR,
+	.name = DLM_PLOCK_MISC_NAME,
+	.fops = &dev_fops
+};
+
+int dlm_plock_init(void)
+{
+	int rv;
+
+	spin_lock_init(&ops_lock);
+	INIT_LIST_HEAD(&send_list);
+	INIT_LIST_HEAD(&recv_list);
+	init_waitqueue_head(&send_wq);
+	init_waitqueue_head(&recv_wq);
+
+	rv = misc_register(&plock_dev_misc);
+	if (rv)
+		log_print("dlm_plock_init: misc_register failed %d", rv);
+	return rv;
+}
+
+void dlm_plock_exit(void)
+{
+	if (misc_deregister(&plock_dev_misc) < 0)
+		log_print("dlm_plock_exit: misc_deregister failed");
+}
+
diff --git a/fs/dlm/recoverd.c b/fs/dlm/recoverd.c
index 997f953..fd677c8 100644
--- a/fs/dlm/recoverd.c
+++ b/fs/dlm/recoverd.c
@@ -257,6 +257,7 @@ static void do_ls_recovery(struct dlm_ls *ls)
 	if (rv) {
 		ls_recover(ls, rv);
 		kfree(rv->nodeids);
+		kfree(rv->new);
 		kfree(rv);
 	}
 }