kernel/linux.git/include/linux/sunrpc/sched.h, branch linux-2.6.34.y

NLM: Don't hang forever on NLM unlock requests

2012-08-17T19:35:41+00:00

commit 0b760113a3a155269a3fba93a409c640031dd68f upstream. If the NLM daemon is killed on the NFS server, we can currently end up hanging forever on an 'unlock' request, instead of aborting. Basically, if the rpcbind request fails, or the server keeps returning garbage, we really want to quit instead of retrying. Tested-by: Vasily Averin Signed-off-by: Trond Myklebust [PG: struct rpc_task in sched.h slightly different layout vs. v3.0] Signed-off-by: Paul Gortmaker

rpc: add a new priority in RPC task

2009-12-15T18:53:54+00:00

Signed-off-by: Alexandros Batsakis Signed-off-by: Trond Myklebust

rpc: add rpc_queue_empty function

2009-12-15T18:51:17+00:00

Signed-off-by: Alexandros Batsakis Signed-off-by: Trond Myklebust

SUNRPC: Allow RPCs to fail quickly if the server is unreachable

2009-12-03T20:58:56+00:00

The kernel sometimes makes RPC calls to services that aren't running. Because the kernel's RPC client always assumes the hard retry semantic when reconnecting a connection-oriented RPC transport, the underlying reconnect logic takes a long while to time out, even though the remote may have responded immediately with ECONNREFUSED. In certain cases, like upcalls to our local rpcbind daemon, or for NFS mount requests, we'd like the kernel to fail immediately if the remote service isn't reachable. This allows another transport to be tried immediately, or the pending request can be abandoned quickly. Introduce a per-request flag which controls how call_transmit_status() behaves when request transmission fails because the server cannot be reached. We don't want soft connection semantics to apply to other errors. The default case of the switch statement in call_transmit_status() no longer falls through; the fall through code is copied to the default case, and a "break;" is added. The transport's connection re-establishment timeout is also ignored for such requests. We want the request to fail immediately, so the reconnect delay is skipped. Additionally, we don't want a connect failure here to further increase the reconnect timeout value, since this request will not be retried. Signed-off-by: Chuck Lever Signed-off-by: Trond Myklebust

nfs41: Add backchannel processing support to RPC state machine

2009-06-17T21:11:24+00:00

Adds rpc_run_bc_task() which is called by the NFS callback service to process backchannel requests. It performs similar work to rpc_run_task() though "schedules" the backchannel task to be executed starting at the call_trasmit state in the RPC state machine. It also introduces some miscellaneous updates to the argument validation, call_transmit, and transport cleanup functions to take into account that there are now forechannel and backchannel tasks. Backchannel requests do not carry an RPC message structure, since the payload has already been XDR encoded using the existing NFSv4 callback mechanism. Introduce a new transmit state for the client to reply on to backchannel requests. This new state simply reserves the transport and issues the reply. In case of a connection related error, disconnects the transport and drops the reply. It requires the forechannel to re-establish the connection and the server to retransmit the request, as stated in NFSv4.1 section 2.9.2 "Client and Server Transport Behavior". Note: There is no need to loop attempting to reserve the transport. If EAGAIN is returned by xprt_prepare_transmit(), return with tk_status == 0, setting tk_action to call_bc_transmit. rpc_execute() will invoke it again after the task is taken off the sleep queue. [nfs41: rpc_run_bc_task() need not be exported outside RPC module] [nfs41: New call_bc_transmit RPC state] Signed-off-by: Ricardo Labiaga Signed-off-by: Benny Halevy [nfs41: Backchannel: No need to loop in call_bc_transmit()] Signed-off-by: Andy Adamson Signed-off-by: Ricardo Labiaga Signed-off-by: Benny Halevy [rpc_count_iostats incorrectly exits early] Signed-off-by: Ricardo Labiaga Signed-off-by: Benny Halevy [Convert rpc_reply_expected() to inline function] [Remove unnecessary BUG_ON()] [Rename variable] Signed-off-by: Ricardo Labiaga Signed-off-by: Benny Halevy

nfs41: sunrpc: Export the call prepare state for session reset

2009-06-17T19:25:07+00:00

Signed-off-by: Andy Adamson Signed-off-by: Benny Halevy Signed-off-by: Trond Myklebust

rpc: minor cleanup of scheduler callback code

2008-07-09T16:09:14+00:00

Try to make the comment here a little more clear and concise. Also, this macro definition seems unnecessary. Signed-off-by: J. Bruce Fields Signed-off-by: Trond Myklebust

SUNRPC: Remove now-redundant RCU-safe rpc_task free path

2008-02-29T07:26:28+00:00

Now that we've tightened up the locking rules for RPC queue wakeups, we can remove the RCU-safe kfree calls... Signed-off-by: Trond Myklebust

SUNRPC: Eliminate the now-redundant rpc_start_wakeup()

2008-02-29T07:26:25+00:00

Signed-off-by: Trond Myklebust

SUNRPC: Switch tasks to using the rpc_waitqueue's timer function

2008-02-29T07:26:21+00:00

Signed-off-by: Trond Myklebust