1 files changed, 13 insertions, 64 deletions

diff --git a/sys/dev/filemon/filemon_lock.c b/sys/dev/filemon/filemon_lock.c
index 6e836d1..a0347000 100644
--- a/sys/dev/filemon/filemon_lock.c
+++ b/sys/dev/filemon/filemon_lock.c
@@ -1,5 +1,6 @@
 /*-
  * Copyright (c) 2009-2011, Juniper Networks, Inc.
+ * Copyright (c) 2015, EMC Corp.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -27,96 +28,44 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-static void
+static __inline void
 filemon_filemon_lock(struct filemon *filemon)
 {
-	mtx_lock(&filemon->mtx);
 
-	while (filemon->locker != NULL && filemon->locker != curthread)
-		cv_wait(&filemon->cv, &filemon->mtx);
-
-	filemon->locker = curthread;
-
-	mtx_unlock(&filemon->mtx);
+	sx_xlock(&filemon->lock);
 }
 
-static void
+static __inline void
 filemon_filemon_unlock(struct filemon *filemon)
 {
-	mtx_lock(&filemon->mtx);
-
-	if (filemon->locker == curthread)
-		filemon->locker = NULL;
-
-	/* Wake up threads waiting. */
-	cv_broadcast(&filemon->cv);
 
-	mtx_unlock(&filemon->mtx);
+	sx_xunlock(&filemon->lock);
 }
 
-static void
+static __inline void
 filemon_lock_read(void)
 {
-	mtx_lock(&access_mtx);
-
-	while (access_owner != NULL || access_requester != NULL)
-		cv_wait(&access_cv, &access_mtx);
-
-	n_readers++;
-
-	/* Wake up threads waiting. */
-	cv_broadcast(&access_cv);
 
-	mtx_unlock(&access_mtx);
+	sx_slock(&access_lock);
 }
 
-static void
+static __inline void
 filemon_unlock_read(void)
 {
-	mtx_lock(&access_mtx);
 
-	if (n_readers > 0)
-		n_readers--;
-
-	/* Wake up a thread waiting. */
-	cv_broadcast(&access_cv);
-
-	mtx_unlock(&access_mtx);
+	sx_sunlock(&access_lock);
 }
 
-static void
+static __inline void
 filemon_lock_write(void)
 {
-	mtx_lock(&access_mtx);
-
-	while (access_owner != curthread) {
-		if (access_owner == NULL &&
-		    (access_requester == NULL ||
-		    access_requester == curthread)) {
-			access_owner = curthread;
-			access_requester = NULL;
-		} else {
-			if (access_requester == NULL)
-				access_requester = curthread;
 
-			cv_wait(&access_cv, &access_mtx);
-		}
-	}
-
-	mtx_unlock(&access_mtx);
+	sx_xlock(&access_lock);
 }
 
-static void
+static __inline void
 filemon_unlock_write(void)
 {
-	mtx_lock(&access_mtx);
-
-	/* Sanity check that the current thread actually has the write lock. */
-	if (access_owner == curthread)
-		access_owner = NULL;
-
-	/* Wake up a thread waiting. */
-	cv_broadcast(&access_cv);
 
-	mtx_unlock(&access_mtx);
+	sx_xunlock(&access_lock);
 }