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[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>
This commit is contained in:
Venkateswararao Jujjuri (JV) 2011-02-13 16:23:59 -08:00 committed by Eric Van Hensbergen
parent bb2f8a5515
commit 1fc52481c2
1 changed files with 15 additions and 6 deletions
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21
net/9p/client.c
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@ -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;