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authorVenkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>2011-01-29 01:11:13 +0300
committerEric Van Hensbergen <ericvh@gmail.com>2011-03-15 17:57:34 +0300
commit022cae36551ba805bf82084047945b2901d75f36 (patch)
tree5d8a8ff0eb2102d0449f58ddfcb8907bd3625682 /include/net/9p
parent6752a1ebd13f69b9d5ff08914fe29ee2813cbeea (diff)
downloadlinux-022cae36551ba805bf82084047945b2901d75f36.tar.xz
[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 <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'include/net/9p')
-rw-r--r--include/net/9p/9p.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h
index 071fd7a8d781..7aefa6d975ac 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;
};