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| author | Chuck Lever <chuck.lever@oracle.com> | 2007-02-07 00:26:11 +0100 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2007-02-13 07:40:45 +0100 |
| commit | 43d78ef2ba5bec26d0315859e8324bfc0be23766 (patch) | |
| tree | 6ea576e0a20a11745c7a45b2a15dd855a45b655a /net/sunrpc | |
| parent | NFS: Don't use ClearPageUptodate() when writeback fails (diff) | |
| download | linux-43d78ef2ba5bec26d0315859e8324bfc0be23766.tar.xz linux-43d78ef2ba5bec26d0315859e8324bfc0be23766.zip | |
NFS: disconnect before retrying NFSv4 requests over TCP
RFC3530 section 3.1.1 states an NFSv4 client MUST NOT send a request
twice on the same connection unless it is the NULL procedure. Section
3.1.1 suggests that the client should disconnect and reconnect if it
wants to retry a request.
Implement this by adding an rpc_clnt flag that an ULP can use to
specify that the underlying transport should be disconnected on a
major timeout. The NFSv4 client asserts this new flag, and requests
no retries after a minor retransmit timeout.
Note that disconnecting on a retransmit is in general not safe to do
if the RPC client does not reuse the TCP port number when reconnecting.
See http://bugzilla.linux-nfs.org/show_bug.cgi?id=6
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc')
| -rw-r--r-- | net/sunrpc/clnt.c | 2 | ||||
| -rw-r--r-- | net/sunrpc/xprt.c | 10 |
2 files changed, 12 insertions, 0 deletions
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index 393e70aee181..c21aa0a7f770 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -249,6 +249,8 @@ struct rpc_clnt *rpc_create(struct rpc_create_args *args) clnt->cl_autobind = 1; if (args->flags & RPC_CLNT_CREATE_ONESHOT) clnt->cl_oneshot = 1; + if (args->flags & RPC_CLNT_CREATE_DISCRTRY) + clnt->cl_discrtry = 1; return clnt; } diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c index cf59f7d315d0..1975139b26e7 100644 --- a/net/sunrpc/xprt.c +++ b/net/sunrpc/xprt.c @@ -735,6 +735,16 @@ void xprt_transmit(struct rpc_task *task) xprt_reset_majortimeo(req); /* Turn off autodisconnect */ del_singleshot_timer_sync(&xprt->timer); + } else { + /* If all request bytes have been sent, + * then we must be retransmitting this one */ + if (!req->rq_bytes_sent) { + if (task->tk_client->cl_discrtry) { + xprt_disconnect(xprt); + task->tk_status = -ENOTCONN; + return; + } + } } } else if (!req->rq_bytes_sent) return; |