NFS: Fix a few more clear_bit() instances that need release semantics

All these bits are being used as bit locks.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/nfs4state.c

@@ -1194,10 +1194,7 @@ static int nfs4_run_state_manager(void *);
 
 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
 {
-	smp_mb__before_atomic();
-	clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
-	smp_mb__after_atomic();
-	wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
+	clear_and_wake_up_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
 	rpc_wake_up(&clp->cl_rpcwaitq);
 }
 

fs/nfs/pagelist.c

@@ -271,8 +271,7 @@ nfs_page_set_headlock(struct nfs_page *req)
 void
 nfs_page_clear_headlock(struct nfs_page *req)
 {
-	smp_mb__before_atomic();
-	clear_bit(PG_HEADLOCK, &req->wb_flags);
+	clear_bit_unlock(PG_HEADLOCK, &req->wb_flags);
 	smp_mb__after_atomic();
 	if (!test_bit(PG_CONTENDED1, &req->wb_flags))
 		return;
@@ -525,12 +524,7 @@ nfs_create_subreq(struct nfs_page *req,
  */
 void nfs_unlock_request(struct nfs_page *req)
 {
-	if (!NFS_WBACK_BUSY(req)) {
-		printk(KERN_ERR "NFS: Invalid unlock attempted\n");
-		BUG();
-	}
-	smp_mb__before_atomic();
-	clear_bit(PG_BUSY, &req->wb_flags);
+	clear_bit_unlock(PG_BUSY, &req->wb_flags);
 	smp_mb__after_atomic();
 	if (!test_bit(PG_CONTENDED2, &req->wb_flags))
 		return;