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| author |   Chuck Lever <chuck.lever@oracle.com> | 2007-02-06 18:26:11 -0500 |
|---|---|---|
| committer |   Trond Myklebust <Trond.Myklebust@netapp.com> | 2007-02-12 22:40:45 -0800 |
| commit | 43d78ef2ba5bec26d0315859e8324bfc0be23766 (patch) | |
| tree | 6ea576e0a20a11745c7a45b2a15dd855a45b655a /include | |
| parent | NFS: Don't use ClearPageUptodate() when writeback fails (diff) | |
| download | linux-dev-43d78ef2ba5bec26d0315859e8324bfc0be23766.tar.xz linux-dev-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 'include')
| -rw-r--r-- | include/linux/sunrpc/clnt.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h index a1be89deb3af..c7a78eef2b4f 100644 --- a/include/linux/sunrpc/clnt.h +++ b/include/linux/sunrpc/clnt.h @@ -40,6 +40,7 @@ struct rpc_clnt { unsigned int cl_softrtry : 1,/* soft timeouts */ cl_intr : 1,/* interruptible */ + cl_discrtry : 1,/* disconnect before retry */ cl_autobind : 1,/* use getport() */ cl_oneshot : 1,/* dispose after use */ cl_dead : 1;/* abandoned */ @@ -111,6 +112,7 @@ struct rpc_create_args { #define RPC_CLNT_CREATE_ONESHOT (1UL << 3) #define RPC_CLNT_CREATE_NONPRIVPORT (1UL << 4) #define RPC_CLNT_CREATE_NOPING (1UL << 5) +#define RPC_CLNT_CREATE_DISCRTRY (1UL << 6) struct rpc_clnt *rpc_create(struct rpc_create_args *args); struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *, |