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authorVenkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>2011-01-28 17:05:59 -0800
committerEric Van Hensbergen <ericvh@gmail.com>2011-03-15 09:57:35 -0500
commitbb2f8a55153ec58e66a496224504ac9be919c8f1 (patch)
tree25a0d7b4d74b42ca6389fa8f4c41c9378ccd75de /net/9p
parent6f69c395cefb26ebba2c9bb725296a3a4a9200ec (diff)
downloadop-kernel-dev-bb2f8a55153ec58e66a496224504ac9be919c8f1.zip
op-kernel-dev-bb2f8a55153ec58e66a496224504ac9be919c8f1.tar.gz
[net/9p] Read side zerocopy changes for 9P2000.L protocol.
Modify p9_client_read() 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/9p')
-rw-r--r--net/9p/client.c26
-rw-r--r--net/9p/protocol.c21
2 files changed, 39 insertions, 8 deletions
diff --git a/net/9p/client.c b/net/9p/client.c
index a848bca..82079f9 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);
diff --git a/net/9p/protocol.c b/net/9p/protocol.c
index 5936c50..7bca242 100644
--- a/net/9p/protocol.c
+++ b/net/9p/protocol.c
@@ -114,6 +114,17 @@ pdu_write_u(struct p9_fcall *pdu, const char __user *udata, size_t size)
return size - len;
}
+static size_t
+pdu_write_urw(struct p9_fcall *pdu, const char *kdata, const char __user *udata,
+ size_t size)
+{
+ BUG_ON(pdu->size > P9_IOHDRSZ);
+ pdu->pubuf = (char __user *)udata;
+ pdu->pkbuf = (char *)kdata;
+ pdu->pbuf_size = size;
+ return 0;
+}
+
/*
b - int8_t
w - int16_t
@@ -445,6 +456,16 @@ p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
errcode = -EFAULT;
}
break;
+ case 'E':{
+ int32_t cnt = va_arg(ap, int32_t);
+ const char *k = va_arg(ap, const void *);
+ const char *u = va_arg(ap, const void *);
+ errcode = p9pdu_writef(pdu, proto_version, "d",
+ cnt);
+ if (!errcode && pdu_write_urw(pdu, k, u, cnt))
+ errcode = -EFAULT;
+ }
+ break;
case 'U':{
int32_t count = va_arg(ap, int32_t);
const char __user *udata =
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