diff options
Diffstat (limited to 'net/9p/client.c')
| -rw-r--r-- | net/9p/client.c | 26 |
1 files changed, 18 insertions, 8 deletions
diff --git a/net/9p/client.c b/net/9p/client.c index a848bca9fbff..82079f902f56 100644 --- a/net/9p/client.c +++ b/net/9p/client.c @@ -1270,7 +1270,15 @@ p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, if (count < rsize) rsize = count; - req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize); + /* 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_TREAD, "dqE", fid->fid, offset, + rsize, data, udata); + } else { + req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, + rsize); + } if (IS_ERR(req)) { err = PTR_ERR(req); goto error; @@ -1284,13 +1292,15 @@ p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count); - if (data) { - memmove(data, dataptr, count); - } else { - err = copy_to_user(udata, dataptr, count); - if (err) { - err = -EFAULT; - goto free_and_error; + if (!req->tc->pbuf_size) { + if (data) { + memmove(data, dataptr, count); + } else { + err = copy_to_user(udata, dataptr, count); + if (err) { + err = -EFAULT; + goto free_and_error; + } } } p9_free_req(clnt, req); |