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nfs41: Process the RPC call direction

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Reading and storing the RPC direction is a three step process.

1. xs_tcp_read_calldir() reads the RPC direction, but it will not store it
in the XDR buffer since the 'struct rpc_rqst' is not yet available.

2. The 'struct rpc_rqst' is obtained during the TCP_RCV_COPY_DATA state.
This state need not necessarily be preceeded by the TCP_RCV_READ_CALLDIR.
For example, we may be reading a continuation packet to a large reply.
Therefore, we can't simply obtain the 'struct rpc_rqst' during the
TCP_RCV_READ_CALLDIR state and assume it's available during TCP_RCV_COPY_DATA.

This patch adds a new TCP_RCV_READ_CALLDIR flag to indicate the need to
read the RPC direction.  It then uses TCP_RCV_COPY_CALLDIR to indicate the
RPC direction needs to be saved after the 'struct rpc_rqst' has been allocated.

3. The 'struct rpc_rqst' is obtained by the xs_tcp_read_data() helper
functions.  xs_tcp_read_common() then saves the RPC direction in the XDR
buffer if TCP_RCV_COPY_CALLDIR is set.  This will happen when we're reading
the data immediately after the direction was read.  xs_tcp_read_common()
then clears this flag.

[was nfs41: Skip past the RPC call direction]
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: sunrpc: Add RPC direction back into the XDR buffer]
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: sunrpc: Don't skip past the RPC call direction]
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
This commit is contained in:
Ricardo Labiaga 2009-04-01 09:22:54 -04:00 committed by Benny Halevy
parent 18dca02aeb
commit f4a2e418bf
2 changed files with 28 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
net/sunrpc/clnt.c
View File

@ -1390,13 +1390,14 @@ rpc_verify_header(struct rpc_task *task)
}
if ((len -= 3) < 0)
goto out_overflow;
p += 1; /* skip XID */
p += 1; /* skip XID */
if ((n = ntohl(*p++)) != RPC_REPLY) {
dprintk("RPC: %5u %s: not an RPC reply: %x\n",
task->tk_pid, __func__, n);
task->tk_pid, __func__, n);
goto out_garbage;
}
if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
if (--len < 0)
goto out_overflow;

31
net/sunrpc/xprtsock.c
View File

@ -270,12 +270,13 @@ struct sock_xprt {
#define TCP_RCV_COPY_FRAGHDR (1UL << 1)
#define TCP_RCV_COPY_XID (1UL << 2)
#define TCP_RCV_COPY_DATA (1UL << 3)
#define TCP_RCV_COPY_CALLDIR (1UL << 4)
#define TCP_RCV_READ_CALLDIR (1UL << 4)
#define TCP_RCV_COPY_CALLDIR (1UL << 5)
/*
* TCP RPC flags
*/
#define TCP_RPC_REPLY (1UL << 5)
#define TCP_RPC_REPLY (1UL << 6)
static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
{
@ -997,7 +998,7 @@ static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_r
if (used != len)
return;
transport->tcp_flags &= ~TCP_RCV_COPY_XID;
transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
transport->tcp_copied = 4;
dprintk("RPC: reading %s XID %08x\n",
(transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
@ -1026,9 +1027,13 @@ static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
transport->tcp_offset += used;
if (used != len)
return;
transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
transport->tcp_flags |= TCP_RCV_COPY_DATA;
transport->tcp_copied += 4;
/*
* We don't yet have the XDR buffer, so we will write the calldir
* out after we get the buffer from the 'struct rpc_rqst'
*/
if (ntohl(calldir) == RPC_REPLY)
transport->tcp_flags |= TCP_RPC_REPLY;
else
@ -1059,6 +1064,20 @@ static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_rea
}
rcvbuf = &req->rq_private_buf;
if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
/*
* Save the RPC direction in the XDR buffer
*/
__be32 calldir = transport->tcp_flags & TCP_RPC_REPLY ?
htonl(RPC_REPLY) : 0;
memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
&calldir, sizeof(calldir));
transport->tcp_copied += sizeof(calldir);
transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
}
len = desc->count;
if (len > transport->tcp_reclen - transport->tcp_offset) {
struct xdr_skb_reader my_desc;
@ -1156,7 +1175,7 @@ static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, uns
continue;
}
/* Read in the call/reply flag */
if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
xs_tcp_read_calldir(transport, &desc);
continue;
}