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authorVenkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>2011-02-14 03:23:59 +0300
committerEric Van Hensbergen <ericvh@gmail.com>2011-03-15 17:57:35 +0300
commit1fc52481c2b886c445bb167dfd16ee6de6922ef7 (patch)
tree5d854af0b495441e02ef895570e3d8fac4b0a6a3 /net
parentbb2f8a55153ec58e66a496224504ac9be919c8f1 (diff)
downloadlinux-1fc52481c2b886c445bb167dfd16ee6de6922ef7.tar.xz
[net/9p] Write side zerocopy changes for 9P2000.L protocol.
Modify p9_client_write() to check the transport preference and act accordingly. If the preference is P9_TRANS_PREF_PAYLOAD_SEP, send the payload separately instead of putting it directly on PDU. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'net')
-rw-r--r--net/9p/client.c21
1 files changed, 15 insertions, 6 deletions
diff --git a/net/9p/client.c b/net/9p/client.c
index 82079f902f56..412c52e1de74 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1333,12 +1333,21 @@ p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
if (count < rsize)
rsize = count;
- if (data)
- req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
- rsize, data);
- else
- req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
- rsize, udata);
+
+ /* Don't bother zerocopy form small IO (< 1024) */
+ if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
+ P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) {
+ req = p9_client_rpc(clnt, P9_TWRITE, "dqE", fid->fid, offset,
+ rsize, data, udata);
+ } else {
+
+ if (data)
+ req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
+ offset, rsize, data);
+ else
+ req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
+ offset, rsize, udata);
+ }
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;