Use a rw_semaphore in dm_target.c rather than a rwlock_t, just to keep
in line with dm.c
--- diff/drivers/md/dm-target.c	2002-11-29 09:44:59.000000000 +0000
+++ source/drivers/md/dm-target.c	2003-01-10 10:10:42.000000000 +0000
@@ -18,7 +18,7 @@
 };
 
 static LIST_HEAD(_targets);
-static rwlock_t _lock = RW_LOCK_UNLOCKED;
+static DECLARE_RWSEM(_lock);
 
 #define DM_MOD_NAME_SIZE 32
 
@@ -41,7 +41,7 @@
 {
 	struct tt_internal *ti;
 
-	read_lock(&_lock);
+	down_read(&_lock);
 	ti = __find_target_type(name);
 
 	if (ti) {
@@ -49,7 +49,7 @@
 			__MOD_INC_USE_COUNT(ti->tt.module);
 		ti->use++;
 	}
-	read_unlock(&_lock);
+	up_read(&_lock);
 
 	return ti;
 }
@@ -84,13 +84,13 @@
 {
 	struct tt_internal *ti = (struct tt_internal *) t;
 
-	read_lock(&_lock);
+	down_read(&_lock);
 	if (--ti->use == 0 && ti->tt.module)
 		__MOD_DEC_USE_COUNT(ti->tt.module);
 
 	if (ti->use < 0)
 		BUG();
-	read_unlock(&_lock);
+	up_read(&_lock);
 
 	return;
 }
@@ -115,13 +115,13 @@
 	if (!ti)
 		return -ENOMEM;
 
-	write_lock(&_lock);
+	down_write(&_lock);
 	if (__find_target_type(t->name))
 		rv = -EEXIST;
 	else
 		list_add(&ti->list, &_targets);
 
-	write_unlock(&_lock);
+	up_write(&_lock);
 	return rv;
 }
 
@@ -129,21 +129,21 @@
 {
 	struct tt_internal *ti;
 
-	write_lock(&_lock);
+	down_write(&_lock);
 	if (!(ti = __find_target_type(t->name))) {
-		write_unlock(&_lock);
+		up_write(&_lock);
 		return -EINVAL;
 	}
 
 	if (ti->use) {
-		write_unlock(&_lock);
+		up_write(&_lock);
 		return -ETXTBSY;
 	}
 
 	list_del(&ti->list);
 	kfree(ti);
 
-	write_unlock(&_lock);
+	up_write(&_lock);
 	return 0;
 }