linux-kernel - [PATCH v10 40/46] sunrpc: Allow to demand-allocate pages to encode into

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Message-Id: <1444604337-17651-41-git-send-email-andreas.gruenbacher@gmail.com>
Date:	Mon, 12 Oct 2015 00:58:51 +0200
From:	Andreas Gruenbacher <andreas.gruenbacher@...il.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>,
	"Theodore Ts'o" <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Jeff Layton <jlayton@...chiereds.net>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Anna Schumaker <anna.schumaker@...app.com>,
	Dave Chinner <david@...morbit.com>, linux-ext4@...r.kernel.org,
	xfs@....sgi.com, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-cifs@...r.kernel.org, linux-api@...r.kernel.org
Cc:	Andreas Gruenbacher <agruenba@...hat.com>
Subject: [PATCH v10 40/46] sunrpc: Allow to demand-allocate pages to encode into

From: Andreas Gruenbacher <agruenba@...hat.com>

When encoding large, variable-length objects such as acls into xdr_bufs,
it is easier to allocate buffer pages on demand rather than precomputing
the required buffer size.

Signed-off-by: Andreas Gruenbacher <agruenba@...hat.com>
---
 net/sunrpc/xdr.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index 4439ac4..63c1c36 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -537,6 +537,15 @@ 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_NOFS);
+
+		if (!page)
+			return NULL;
+		*xdr->page_ptr = page;
+	}
+
 	p = page_address(*xdr->page_ptr);
 	/*
 	 * Note this is where the next encode will start after we've
-- 
2.5.0

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