NFS: Make nfs_commit_alloc() extern

We need to use nfs_commit_alloc() in fs/nfs/direct.c.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 6c130a6..423f202b 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -410,6 +410,11 @@
 extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
 extern void nfs_writedata_release(void *);
 
+#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
+struct nfs_write_data *nfs_commit_alloc(unsigned int pagecount);
+void nfs_commit_free(struct nfs_write_data *p);
+#endif
+
 /*
  * Try to write back everything synchronously (but check the
  * return value!)