init_waitqueue_head(&ctx->waitq);
struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred){	struct nfs_open_context *ctx;	ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL);	if (ctx != NULL) {		atomic_set(&ctx->count, 1);		ctx->dentry = dget(dentry);		ctx->cred = get_rpccred(cred);		ctx->state = NULL;		ctx->lockowner = current->files;		ctx->error = 0;		init_waitqueue_head(&ctx->waitq);	}	return ctx;}