[net/9p] readdir zerocopy changes for 9P2000.L protocol.

Modify p9_client_readdir() to check the transport preference and act according
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>

1 files changed, 9 insertions, 2 deletions

diff --git a/net/9p/client.c b/net/9p/client.c
index 412c52e1de74..6e07ef494ff2 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1735,7 +1735,14 @@ int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
         if (count < rsize)
                 rsize = count;
 
-        req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, offset, rsize);
+        if ((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
+                        P9_TRANS_PREF_PAYLOAD_SEP) {
+                req = p9_client_rpc(clnt, P9_TREADDIR, "dqF", fid->fid,
+                                offset, rsize, data);
+        } else {
+                req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
+                                offset, rsize);
+        }
         if (IS_ERR(req)) {
                 err = PTR_ERR(req);
                 goto error;
@@ -1749,7 +1756,7 @@ int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
 
         P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
 
-        if (data)
+        if (!req->tc->pbuf_size && data)
                 memmove(data, dataptr, count);
 
         p9_free_req(clnt, req);