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[net/9p] Preparation and helper functions for zero copy

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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>
This commit is contained in:
Venkateswararao Jujjuri (JV)
2011-01-28 14:11:13 -08:00
committed by Eric Van Hensbergen
parent 6752a1ebd1
commit 022cae3655
5 changed files with 139 additions and 0 deletions
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include/net/9p/9p.h
+8
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@@ -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;
};