Commit Graph

11 Commits

Author SHA1 Message Date
Benny Halevy
d76829889a nfsd4: keep a reference count on client while in use
Get a refcount on the client on SEQUENCE,
Release the refcount and renew the client when all respective compounds completed.
Do not expire the client by the laundromat while in use.
If the client was expired via another path, free it when the compounds
complete and the refcount reaches 0.

Note that unhash_client_locked must call list_del_init on cl_lru as
it may be called twice for the same client (once from nfs4_laundromat
and then from expire_client)

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2010-05-13 11:58:54 -04:00
Benny Halevy
07cd4909a6 nfsd4: mark_client_expired
Mark the client as expired under the client_lock so it won't be renewed
when an nfsv4.1 session is done, after it was explicitly expired
during processing of the compound.

Do not renew a client mark as expired (in particular, it is not
on the lru list anymore)

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2010-05-13 11:47:22 -04:00
Benny Halevy
46583e2597 nfsd4: introduce nfs4_client.cl_refcount
Currently just initialize the cl_refcount to 1
and decrement in expire_client(), conditionally freeing the
client when the refcount reaches 0.

To be used later by nfsv4.1 compounds to keep the client from
timing out while in use.

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2010-05-13 11:47:03 -04:00
J. Bruce Fields
4b21d0defc nfsd4: allow 4.0 clients to change callback path
The rfc allows a client to change the callback parameters, but we didn't
previously implement it.

Teach the callbacks to rerun themselves (by placing themselves on a
workqueue) when they recognize that their rpc task has been killed and
that the callback connection has changed.

Then we can change the callback connection by setting up a new rpc
client, modifying the nfs4 client to point at it, waiting for any work
in progress to complete, and then shutting down the old client.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2010-04-22 11:34:02 -04:00
J. Bruce Fields
2bf23875f5 nfsd4: rearrange cb data structures
Mainly I just want to separate the arguments used for setting up the tcp
client from the rest.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2010-04-22 11:34:02 -04:00
J. Bruce Fields
b12a05cbdf nfsd4: cl_count is unused
Now that the shutdown sequence guarantees callbacks are shut down before
the client is destroyed, we no longer have a use for cl_count.

We'll probably reinstate a reference count on the client some day, but
it will be held by users other than callbacks.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2010-04-22 11:34:02 -04:00
J. Bruce Fields
b5a1a81e5c nfsd4: don't sleep in lease-break callback
The NFSv4 server's fl_break callback can sleep (dropping the BKL), in
order to allocate a new rpc task to send a recall to the client.

As far as I can tell this doesn't cause any races in the current code,
but the analysis is difficult.  Also, the sleep here may complicate the
move away from the BKL.

So, just schedule some work to do the job for us instead.  The work will
later also prove useful for restarting a call after the callback
information is changed.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2010-04-22 11:34:01 -04:00
J. Bruce Fields
227f98d98d nfsd4: preallocate nfs4_rpc_args
Instead of allocating this small structure, just include it in the
delegation.

The nfsd4_callback structure isn't really necessary yet, but we plan to
add to it all the information necessary to perform a callback.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2010-04-02 16:28:11 -04:00
J. Bruce Fields
7663dacd92 nfsd: remove pointless paths in file headers
The new .h files have paths at the top that are now out of date.  While
we're here, just remove all of those from fs/nfsd; they never served any
purpose.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-12-15 15:01:47 -05:00
J. Bruce Fields
1557aca790 nfsd: move most of nfsfh.h to fs/nfsd
Most of this can be trivially moved to a private header as well.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-12-15 15:01:46 -05:00
Boaz Harrosh
9a74af2133 nfsd: Move private headers to source directory
Lots of include/linux/nfsd/* headers are only used by
nfsd module. Move them to the source directory

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-12-14 18:12:12 -05:00