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authorTrond Myklebust <Trond.Myklebust@netapp.com>2012-06-21 17:05:37 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-06-28 17:20:43 -0400
commitc337d3655ce85e12c7c476cb81406521926cacd2 (patch)
tree2d0f0caa7b4f2b3d366ac7a37fc4d2f82b7706c7
parentbfeea1dc1c9238f9e5a17a265489ecd0d19f66bb (diff)
downloadlinux-c337d3655ce85e12c7c476cb81406521926cacd2.tar.bz2
SUNRPC: xdr_read_pages should return the amount of XDR encoded page data
Callers of xdr_read_pages() will want to know exactly how much XDR data is encoded in the pages after the data realignment. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
-rw-r--r--include/linux/sunrpc/xdr.h2
-rw-r--r--net/sunrpc/xdr.c9
2 files changed, 7 insertions, 4 deletions
diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h
index f1e7f884d1c3..2489bce1fb88 100644
--- a/include/linux/sunrpc/xdr.h
+++ b/include/linux/sunrpc/xdr.h
@@ -223,7 +223,7 @@ extern void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,
struct page **pages, unsigned int len);
extern void xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen);
extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
-extern void xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
+extern unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
extern int xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index 5643feb6c645..80d518644cf8 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -745,8 +745,10 @@ EXPORT_SYMBOL_GPL(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[].
+ *
+ * Returns the number of XDR encoded bytes now contained in the pages
*/
-void xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
+unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
{
struct xdr_buf *buf = xdr->buf;
struct kvec *iov;
@@ -756,7 +758,7 @@ void xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
int padding;
if (xdr->nwords == 0)
- return;
+ return 0;
if (nwords > xdr->nwords) {
nwords = xdr->nwords;
len = nwords << 2;
@@ -787,6 +789,7 @@ void xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
xdr->end = (__be32 *)((char *)iov->iov_base + end);
xdr->page_ptr = NULL;
xdr->nwords = XDR_QUADLEN(end - padding);
+ return len;
}
EXPORT_SYMBOL_GPL(xdr_read_pages);
@@ -802,7 +805,7 @@ EXPORT_SYMBOL_GPL(xdr_read_pages);
*/
void xdr_enter_page(struct xdr_stream *xdr, unsigned int len)
{
- xdr_read_pages(xdr, len);
+ len = xdr_read_pages(xdr, len);
/*
* Position current pointer at beginning of tail, and
* set remaining message length.