[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>
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 @@
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 @@
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 =