Commit cf1f08ca authored by Anna Schumaker's avatar Anna Schumaker
Browse files

SUNRPC: Implement a xdr_page_pos() function 



I'll need this for READ_PLUS to help figure out the offset where page
data is stored at, but it might also be useful for other things.

Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent f7d61ee4

include/linux/sunrpc/xdr.h

+1 −0
Original line number Diff line number Diff line
@@ -240,6 +240,7 @@ extern int xdr_restrict_buflen(struct xdr_stream *xdr, int newbuflen); 
extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages,

		unsigned int base, unsigned int len);

extern unsigned int xdr_stream_pos(const struct xdr_stream *xdr);

extern unsigned int xdr_page_pos(const struct xdr_stream *xdr);

extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf,

			    __be32 *p, struct rpc_rqst *rqst);

extern void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,

net/sunrpc/xdr.c

+13 −0
Original line number Diff line number Diff line
@@ -505,6 +505,19 @@ unsigned int xdr_stream_pos(const struct xdr_stream *xdr) 
}

EXPORT_SYMBOL_GPL(xdr_stream_pos);



/**

 * xdr_page_pos - Return the current offset from the start of the xdr pages

 * @xdr: pointer to struct xdr_stream

 */

unsigned int xdr_page_pos(const struct xdr_stream *xdr)

{

	unsigned int pos = xdr_stream_pos(xdr);



	WARN_ON(pos < xdr->buf->head[0].iov_len);

	return pos - xdr->buf->head[0].iov_len;

}

EXPORT_SYMBOL_GPL(xdr_page_pos);



/**

 * xdr_init_encode - Initialize a struct xdr_stream for sending data.

 * @xdr: pointer to xdr_stream struct