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-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 82079f902f5..412c52e1de7 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;