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    Subject[PATCH v8 36/41] sunrpc: Add xdr_init_encode_pages
    Date
    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 63c1c36..f97b96b 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 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
    + * @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
    *
    --
    2.4.3


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