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author | Venkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com> | 2011-01-28 22:11:13 (GMT) |
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committer | Eric Van Hensbergen <ericvh@gmail.com> | 2011-03-15 14:57:34 (GMT) |
commit | 022cae36551ba805bf82084047945b2901d75f36 (patch) | |
tree | 5d8a8ff0eb2102d0449f58ddfcb8907bd3625682 /include | |
parent | 6752a1ebd13f69b9d5ff08914fe29ee2813cbeea (diff) | |
download | linux-fsl-qoriq-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')
-rw-r--r-- | include/net/9p/9p.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h index 071fd7a..7aefa6d 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; }; |