| From | Andreas Gruenbacher <> | Subject | [PATCH v5 34/39] sunrpc: Allow to demand-allocate pages to encode into | Date | Wed, 22 Jul 2015 15:03:24 +0200 |
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From: Andreas Gruenbacher <agruenba@redhat.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@redhat.com> --- net/sunrpc/xdr.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c index 4439ac4..e6a1744 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_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 -- 2.4.3
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