RPC: Allow struc xdr_stream to read the page section of an xdr_buf (8b23ea7b) · Commits · e / devices / android_kernel_teracube_2e

include/linux/sunrpc/xdr.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -194,6 +194,7 @@ extern void xdr_write_pages(struct xdr_stream xdr, struct page *pages,
		extern void xdr_init_decode(struct xdr_stream xdr, struct xdr_buf buf, uint32_t *p);
		extern uint32_t xdr_inline_decode(struct xdr_stream xdr, size_t nbytes);
		extern void xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
		extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);

		#endif /* __KERNEL__ */

+26 −2

Original line number	Diff line number	Diff line
		@@ -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