[PATCH] lockd: replace semaphore, sleep_on

[Thomas Gleixner <tglx@linutronix.de>]

Use wait_event, completion instead of the obsolete sleep_on functions
and the abused semaphore

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
---

 2.6.9-bk-041020-thomas/fs/lockd/clntlock.c |   12 +++++++-----
 2.6.9-bk-041020-thomas/fs/lockd/svc.c      |   23
+++++++++++++----------
 2 files changed, 20 insertions(+), 15 deletions(-)

diff -puN fs/lockd/svc.c~lockd fs/lockd/svc.c
--- 2.6.9-bk-041020/fs/lockd/svc.c~lockd	2004-10-20 15:56:52.000000000
+0200
+++ 2.6.9-bk-041020-thomas/fs/lockd/svc.c	2004-10-20 15:56:52.000000000
+0200
@@ -46,7 +46,7 @@ static pid_t			nlmsvc_pid;
 int				nlmsvc_grace_period;
 unsigned long			nlmsvc_timeout;
 
-static DECLARE_MUTEX_LOCKED(lockd_start);
+static DECLARE_WAIT_QUEUE_HEAD(lockd_start);
 static DECLARE_WAIT_QUEUE_HEAD(lockd_exit);
 
 /*
@@ -109,7 +109,7 @@ lockd(struct svc_rqst *rqstp)
 	 * Let our maker know we're running.
 	 */
 	nlmsvc_pid = current->pid;
-	up(&lockd_start);
+	wake_up(&lockd_start);
 
 	daemonize("lockd");
 
@@ -258,8 +258,15 @@ lockd_up(void)
 			"lockd_up: create thread failed, error=%d\n", error);
 		goto destroy_and_out;
 	}
-	down(&lockd_start);
-
+	/*
+	 * Wait for the lockd process to start, but since we're holding
+	 * the lockd semaphore, we can't wait around forever ...
+	 */
+	if (wait_event_interruptible_timeout(lockd_start,
+					nlmsvc_pid != 0, HZ) <= 0) {
+		printk(KERN_WARNING
+			"lockd_down: lockd failed to start\n");
+	}
 	/*
 	 * Note: svc_serv structures have an initial use count of 1,
 	 * so we exit through here on both success and failure.
@@ -298,16 +305,12 @@ lockd_down(void)
 	 * Wait for the lockd process to exit, but since we're holding
 	 * the lockd semaphore, we can't wait around forever ...
 	 */
-	clear_thread_flag(TIF_SIGPENDING);
-	interruptible_sleep_on_timeout(&lockd_exit, HZ);
-	if (nlmsvc_pid) {
+	if (wait_event_interruptible_timeout(lockd_exit,
+					nlmsvc_pid == 0, HZ) <= 0) {
 		printk(KERN_WARNING 
 			"lockd_down: lockd failed to exit, clearing pid\n");
 		nlmsvc_pid = 0;
 	}
-	spin_lock_irq(&current->sighand->siglock);
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
 out:
 	up(&nlmsvc_sema);
 }
diff -puN fs/lockd/clntlock.c~lockd fs/lockd/clntlock.c
--- 2.6.9-bk-041020/fs/lockd/clntlock.c~lockd	2004-10-20
15:56:52.000000000 +0200
+++ 2.6.9-bk-041020-thomas/fs/lockd/clntlock.c	2004-10-20
15:56:52.000000000 +0200
@@ -6,6 +6,7 @@
  * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
  */
 
+#include <linux/completion.h>
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/time.h>
@@ -32,7 +33,7 @@ static int			reclaimer(void *ptr);
  */
 struct nlm_wait {
 	struct nlm_wait *	b_next;		/* linked list */
-	wait_queue_head_t	b_wait;		/* where to wait on */
+	struct completion	b_wait;		/* where to wait on */
 	struct nlm_host *	b_host;
 	struct file_lock *	b_lock;		/* local file lock */
 	unsigned short		b_reclaim;	/* got to reclaim lock */
@@ -53,7 +54,7 @@ nlmclnt_block(struct nlm_host *host, str
 
 	block.b_host   = host;
 	block.b_lock   = fl;
-	init_waitqueue_head(&block.b_wait);
+	init_completion(&block.b_wait);
 	block.b_status = NLM_LCK_BLOCKED;
 	block.b_next   = nlm_blocked;
 	nlm_blocked    = &block;
@@ -69,7 +70,8 @@ nlmclnt_block(struct nlm_host *host, str
 	 * a 1 minute timeout would do. See the comment before
 	 * nlmclnt_lock for an explanation.
 	 */
-	sleep_on_timeout(&block.b_wait, 30*HZ);
+
+	wait_for_completion_timeout(&block.b_wait, 30*HZ);
 
 	for (head = &nlm_blocked; *head; head = &(*head)->b_next) {
 		if (*head == &block) {
@@ -118,7 +120,7 @@ nlmclnt_grant(struct nlm_lock *lock)
 	 * wake up the caller.
 	 */
 	block->b_status = NLM_LCK_GRANTED;
-	wake_up(&block->b_wait);
+	complete(&block->b_wait);
 
 	return nlm_granted;
 }
@@ -233,7 +235,7 @@ restart:
 	for (block = nlm_blocked; block; block = block->b_next) {
 		if (block->b_host == host) {
 			block->b_status = NLM_LCK_DENIED_GRACE_PERIOD;
-			wake_up(&block->b_wait);
+			complete(&block->b_wait);
 		}
 	}
 
_