From 022cae36551ba805bf82084047945b2901d75f36 Mon Sep 17 00:00:00 2001 From: "Venkateswararao Jujjuri (JV)" Date: Fri, 28 Jan 2011 14:11:13 -0800 Subject: [net/9p] Preparation and helper functions for zero copy This patch prepares p9_fcall structure for zero copy. Added fields send the payload buffer information to the transport layer. In addition it adds a 'private' field for the transport layer to store mapped/pinned page information so that it can be freed/unpinned during req_done. This patch also creates trans_common.[ch] to house helper functions. It adds the following helper functions. p9_release_req_pages - Release pages after the transaction. p9_nr_pages - Return number of pages needed to accomodate the payload. payload_gup - Translates user buffer into kernel pages. Signed-off-by: Venkateswararao Jujjuri Signed-off-by: Eric Van Hensbergen --- net/9p/trans_common.h | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 net/9p/trans_common.h (limited to 'net/9p/trans_common.h') diff --git a/net/9p/trans_common.h b/net/9p/trans_common.h new file mode 100644 index 000000000000..04977e0ad938 --- /dev/null +++ b/net/9p/trans_common.h @@ -0,0 +1,29 @@ +/* + * Copyright IBM Corporation, 2010 + * Author Venkateswararao Jujjuri + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2.1 of the GNU Lesser General Public License + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * + */ + +/** + * struct trans_rpage_info - To store mapped page information in PDU. + * @rp_alloc:Set if this structure is allocd, not a reuse unused space in pdu. + * @rp_nr_pages: Number of mapped pages + * @rp_data: Array of page pointers + */ +struct trans_rpage_info { + u8 rp_alloc; + int rp_nr_pages; + struct page *rp_data[0]; +}; + +void p9_release_req_pages(struct trans_rpage_info *); +int p9_payload_gup(struct p9_req_t *, size_t *, int *, int, u8); +int p9_nr_pages(struct p9_req_t *); -- cgit v1.2.3