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

[pandora-kernel.git] / net / 9p / protocol.c

diff --git a/net/9p/protocol.c b/net/9p/protocol.c
index 7bca242..2ce515b 100644 (file)
--- a/net/9p/protocol.c
+++ b/net/9p/protocol.c
@@ -125,6 +125,15 @@ pdu_write_urw(struct p9_fcall *pdu, const char *kdata, const char __user *udata,
        return 0;
 }
 
+static size_t
+pdu_write_readdir(struct p9_fcall *pdu, const char *kdata, size_t size)
+{
+       BUG_ON(pdu->size > P9_READDIRHDRSZ);
+       pdu->pkbuf = (char *)kdata;
+       pdu->pbuf_size = size;
+       return 0;
+}
+
 /*
        b - int8_t
        w - int16_t
@@ -466,6 +475,15 @@ p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
                                        errcode = -EFAULT;
                         }
                         break;
+               case 'F':{
+                                int32_t cnt = va_arg(ap, int32_t);
+                                const char *k = va_arg(ap, const void *);
+                                errcode = p9pdu_writef(pdu, proto_version, "d",
+                                                cnt);
+                                if (!errcode && pdu_write_readdir(pdu, k, cnt))
+                                       errcode = -EFAULT;
+                        }
+                        break;
                case 'U':{
                                int32_t count = va_arg(ap, int32_t);
                                const char __user *udata =