From 4f15e2b1f4f3a56e46201714b39436c32218d547 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Wed, 22 Jun 2005 17:16:31 +0000
Subject: [PATCH] [PATCH] NLM: cleanup for blocked locks.

 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---
 fs/lockd/clntlock.c | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/fs/lockd/clntlock.c b/fs/lockd/clntlock.c
index ef7103b8c5bd..44adb84183b6 100644
--- a/fs/lockd/clntlock.c
+++ b/fs/lockd/clntlock.c
@@ -31,7 +31,7 @@ static int			reclaimer(void *ptr);
  * This is the representation of a blocked client lock.
  */
 struct nlm_wait {
-	struct nlm_wait *	b_next;		/* linked list */
+	struct list_head	b_list;		/* linked list */
 	wait_queue_head_t	b_wait;		/* where to wait on */
 	struct nlm_host *	b_host;
 	struct file_lock *	b_lock;		/* local file lock */
@@ -39,7 +39,7 @@ struct nlm_wait {
 	u32			b_status;	/* grant callback status */
 };
 
-static struct nlm_wait *	nlm_blocked;
+static LIST_HEAD(nlm_blocked);
 
 /*
  * Block on a lock
@@ -55,8 +55,7 @@ nlmclnt_block(struct nlm_host *host, struct file_lock *fl, u32 *statp)
 	block.b_lock   = fl;
 	init_waitqueue_head(&block.b_wait);
 	block.b_status = NLM_LCK_BLOCKED;
-	block.b_next   = nlm_blocked;
-	nlm_blocked    = &block;
+	list_add(&block.b_list, &nlm_blocked);
 
 	/* Remember pseudo nsm state */
 	pstate = host->h_state;
@@ -71,12 +70,7 @@ nlmclnt_block(struct nlm_host *host, struct file_lock *fl, u32 *statp)
 	 */
 	sleep_on_timeout(&block.b_wait, 30*HZ);
 
-	for (head = &nlm_blocked; *head; head = &(*head)->b_next) {
-		if (*head == &block) {
-			*head = block.b_next;
-			break;
-		}
-	}
+	list_del(&block.b_list);
 
 	if (!signalled()) {
 		*statp = block.b_status;
@@ -105,7 +99,7 @@ nlmclnt_grant(struct nlm_lock *lock)
 	 * Look up blocked request based on arguments. 
 	 * Warning: must not use cookie to match it!
 	 */
-	for (block = nlm_blocked; block; block = block->b_next) {
+	list_for_each_entry(block, &nlm_blocked, b_list) {
 		if (nlm_compare_locks(block->b_lock, &lock->fl))
 			break;
 	}
@@ -230,7 +224,7 @@ restart:
 	host->h_reclaiming = 0;
 
 	/* Now, wake up all processes that sleep on a blocked lock */
-	for (block = nlm_blocked; block; block = block->b_next) {
+	list_for_each_entry(block, &nlm_blocked, b_list) {
 		if (block->b_host == host) {
 			block->b_status = NLM_LCK_DENIED_GRACE_PERIOD;
 			wake_up(&block->b_wait);