[PATCH v5 35/39] sunrpc: Add xdr_init_encode_pages
From: Andreas Gruenbacher <hidden>
Date: 2015-07-22 13:03:25
Also in:
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
From: Andreas Gruenbacher <agruenba@redhat.com> Initialize xdr_stream and xdr_buf from a pages array, for encoding into the pages. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> --- include/linux/sunrpc/xdr.h | 2 ++ net/sunrpc/xdr.c | 25 +++++++++++++++++++++++++ 2 files changed, 27 insertions(+)
diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h
index 70c6b92..2c99cff 100644
--- a/include/linux/sunrpc/xdr.h
+++ b/include/linux/sunrpc/xdr.h@@ -214,6 +214,8 @@ typedef void (*kxdreproc_t)(void *rqstp, struct xdr_stream *xdr, void *obj); typedef int (*kxdrdproc_t)(void *rqstp, struct xdr_stream *xdr, void *obj); extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p); +extern void xdr_init_encode_pages(struct xdr_stream *xdr, struct xdr_buf *buf, + struct page **pages, unsigned int len); extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes); extern void xdr_commit_encode(struct xdr_stream *xdr); extern void xdr_truncate_encode(struct xdr_stream *xdr, size_t len);
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index e6a1744..4a4437c 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c@@ -483,6 +483,31 @@ void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p) EXPORT_SYMBOL_GPL(xdr_init_encode); /** + * xdr_init_encode_pages - Initialize a struct xdr_stream for encoding into pages. + * @xdr: pointer to xdr_stream struct + * @buf: pointer to XDR buffer in which to encode data + * @pages: pages array in which to encode + * @page_len: maximum length of @buf + * + * Initialize @xdr and @buf for encoding into the @pages array. If a + * page in @pages is NULL, it will be allocated on demand. + */ +void xdr_init_encode_pages(struct xdr_stream *xdr, struct xdr_buf *buf, + struct page **pages, unsigned int len) +{ + memset(buf, 0, sizeof(*buf)); + buf->pages = pages; + buf->page_len = len; + buf->buflen = len; + + memset(xdr, 0, sizeof(*xdr)); + xdr->buf = buf; + xdr->iov = buf->head; + xdr->page_ptr = pages - 1; +} +EXPORT_SYMBOL_GPL(xdr_init_encode_pages); + +/** * xdr_commit_encode - Ensure all data is written to buffer * @xdr: pointer to xdr_stream *
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2.4.3