PS: the part below was on top of patch from dwmw2; in the mainline the analog
of that sucker is in XFS.

quoted text
> diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
> index 8291591..77ad3a5 100644
> --- a/fs/nfsd/vfs.c
> +++ b/fs/nfsd/vfs.c
> @@ -1832,6 +1832,7 @@ struct buffered_dirent {
>  struct readdir_data {
>  	char		*dirent;
>  	size_t		used;
> +	int		full;
>  };
>  
>  static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen,
> @@ -1842,8 +1843,10 @@ static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen,
>  	unsigned int reclen;
>  
>  	reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64));
> -	if (buf->used + reclen > PAGE_SIZE)
> +	if (buf->used + reclen > PAGE_SIZE) {
> +		buf->full = 1;
>  		return -EINVAL;
> +	}
>  
>  	de->namlen = namlen;
>  	de->offset = offset;
> @@ -1875,9 +1878,13 @@ static int nfsd_buffered_readdir(struct file *file, filldir_t func,
>  		unsigned int reclen;
>  
>  		buf.used = 0;
> +		buf.full = 0;
>  
>  		host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf);
> -		if (host_err)
> +		if (buf.full)
> +			host_err = 0;
> +
> +		if (host_err < 0)
>  			break;
>  
>  		size = buf.used;
--
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