tree 7affe8e1108373906eefcea00498df088b6dfccb
parent ece0de633c4d9106c39ea9f0db1638c42ead2541
author Andy Adamson <andros@netapp.com> 1294279474 +0000
committer Trond Myklebust <Trond.Myklebust@netapp.com> 1294343185 -0500

NFS add session back channel draining

Currently session draining only drains the fore channel.
The back channel processing must also be drained.

Use the back channel highest_slot_used to indicate that a callback is being
processed by the callback thread.  Move the session complete to be per channel.

When the session is draininig, wait for any current back channel processing
to complete and stop all new back channel processing by returning NFS4ERR_DELAY
to the back channel client.

Drain the back channel, then the fore channel.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>