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authorTrond Myklebust <Trond.Myklebust@netapp.com>2006-06-09 09:34:21 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2006-06-09 09:34:21 -0400
commit8b23ea7bedb8b45a5bb56745fa3ff11018acf04e (patch)
treeb312b3d0d9e27704792fd7dfcd9bc041b1122bef /net/sunrpc/xdr.c
parent51d8fa6a109589d522c18a8e9bf3fb167a91b1bc (diff)
downloadop-kernel-dev-8b23ea7bedb8b45a5bb56745fa3ff11018acf04e.zip
op-kernel-dev-8b23ea7bedb8b45a5bb56745fa3ff11018acf04e.tar.gz
RPC: Allow struc xdr_stream to read the page section of an xdr_buf
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc/xdr.c')
-rw-r--r--net/sunrpc/xdr.c28
1 files changed, 26 insertions, 2 deletions
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index ca4bfa5..49174f0 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -568,8 +568,7 @@ EXPORT_SYMBOL(xdr_inline_decode);
*
* Moves data beyond the current pointer position from the XDR head[] buffer
* into the page list. Any data that lies beyond current position + "len"
- * bytes is moved into the XDR tail[]. The current pointer is then
- * repositioned at the beginning of the XDR tail.
+ * bytes is moved into the XDR tail[].
*/
void xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
{
@@ -606,6 +605,31 @@ void xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
}
EXPORT_SYMBOL(xdr_read_pages);
+/**
+ * xdr_enter_page - decode data from the XDR page
+ * @xdr: pointer to xdr_stream struct
+ * @len: number of bytes of page data
+ *
+ * Moves data beyond the current pointer position from the XDR head[] buffer
+ * into the page list. Any data that lies beyond current position + "len"
+ * bytes is moved into the XDR tail[]. The current pointer is then
+ * repositioned at the beginning of the first XDR page.
+ */
+void xdr_enter_page(struct xdr_stream *xdr, unsigned int len)
+{
+ char * kaddr = page_address(xdr->buf->pages[0]);
+ xdr_read_pages(xdr, len);
+ /*
+ * Position current pointer at beginning of tail, and
+ * set remaining message length.
+ */
+ if (len > PAGE_CACHE_SIZE - xdr->buf->page_base)
+ len = PAGE_CACHE_SIZE - xdr->buf->page_base;
+ xdr->p = (uint32_t *)(kaddr + xdr->buf->page_base);
+ xdr->end = (uint32_t *)((char *)xdr->p + len);
+}
+EXPORT_SYMBOL(xdr_enter_page);
+
static struct kvec empty_iov = {.iov_base = NULL, .iov_len = 0};
void
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