Return-Path: Received: from mail-wg0-f49.google.com ([74.125.82.49]:33818 "EHLO mail-wg0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030615AbbDXLFt (ORCPT ); Fri, 24 Apr 2015 07:05:49 -0400 From: Andreas Gruenbacher To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org Subject: [RFC v3 41/45] rpc: Allow to demand-allocate pages to encode into Date: Fri, 24 Apr 2015 13:04:38 +0200 Message-Id: <4bf77d045d2bd3494c695229cd0505b7002cc9a2.1429868795.git.agruenba@redhat.com> In-Reply-To: References: In-Reply-To: References: Sender: linux-nfs-owner@vger.kernel.org List-ID: When encoding large, variable-length objects such as acls into xdr_bufs, it is easier to allocate buffer pages on demand rather than computing the required buffer size beforehand. Signed-off-by: Andreas Gruenbacher --- net/sunrpc/xdr.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c index 4439ac4..062951b 100644 --- a/net/sunrpc/xdr.c +++ b/net/sunrpc/xdr.c @@ -537,6 +537,14 @@ static __be32 *xdr_get_next_encode_buffer(struct xdr_stream *xdr, */ xdr->scratch.iov_base = xdr->p; xdr->scratch.iov_len = frag1bytes; + + if (!*xdr->page_ptr) { + struct page *page = alloc_page(GFP_KERNEL); + if (!page) + return ERR_PTR(-ENOMEM); + *xdr->page_ptr = page; + } + p = page_address(*xdr->page_ptr); /* * Note this is where the next encode will start after we've -- 2.1.0