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 --- include/net/9p/9p.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'include/net/9p') diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h index 071fd7a8d78..7aefa6d975a 100644 --- a/include/net/9p/9p.h +++ b/include/net/9p/9p.h @@ -689,6 +689,10 @@ struct p9_rwstat { * @tag: transaction id of the request * @offset: used by marshalling routines to track currentposition in buffer * @capacity: used by marshalling routines to track total capacity + * @pubuf: Payload user buffer given by the caller + * @pubuf: Payload kernel buffer given by the caller + * @pbuf_size: pubuf/pkbuf(only one will be !NULL) size to be read/write. + * @private: For transport layer's use. * @sdata: payload * * &p9_fcall represents the structure for all 9P RPC @@ -705,6 +709,10 @@ struct p9_fcall { size_t offset; size_t capacity; + char __user *pubuf; + char *pkbuf; + size_t pbuf_size; + void *private; uint8_t *sdata; }; -- cgit v1.2.3-70-g09d2