tree 41632f7d033a791e1925a84f14488efcb9c0dd83
parent 7146851376861fe55c7a48ac8fc1354a5fff6cd0
author Ricardo Labiaga <Ricardo.Labiaga@netapp.com> 1238592178 -0400
committer Benny Halevy <bhalevy@panasas.com> 1245269173 -0700

nfs41: client callback structures

Adds new list of rpc_xprt structures, and a readers/writers lock to
protect the list.  The list is used to preallocate resources for
the backchannel during backchannel requests.  Callbacks are not
expected to cause significant latency, so only one callback will
be allowed at this time.

It also adds a pointer to the NFS callback service so that
requests can be directed to it for processing.

New callback members added to svc_serv. The NFSv4.1 callback service will
sleep on the svc_serv->svc_cb_waitq until new callback requests arrive.
The request will be queued in svc_serv->svc_cb_list. This patch adds this
list, the sleep queue and spinlock to svc_serv.

[nfs41: NFSv4.1 callback support]
Signed-off-by: Ricardo Labiaga <ricardo.labiaga@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>