[RFC v6 35/40] sunrpc: Allow to demand-allocate pages to encode into
From: Andreas Gruenbacher <hidden>
Date: 2015-08-04 11:53:33
Also in:
linux-api, linux-fsdevel, linux-nfs, lkml
Subsystem:
kernel nfsd, sunrpc, and lockd servers, networking [general], nfs, sunrpc, and lockd clients, the rest · Maintainers:
Chuck Lever, Jeff Layton, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Trond Myklebust, Anna Schumaker, Linus Torvalds
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@redhat.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
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2.5.0