tree 9f1fcee1c9dc22515d335c69db0f01e5eb9f4bb1
parent fcb6d9c6b719b633e9b98d26d8a7937209e8bf21
author Bryan Schumaker <bjschuma@netapp.com> 1348687552 -0400
committer Trond Myklebust <Trond.Myklebust@netapp.com> 1349129845 -0700

NFS: Remove bad delegations during open recovery

I put the client into an open recovery loop by:
	Client: Open file
		read half
	Server: Expire client (echo 0 > /sys/kernel/debug/nfsd/forget_clients)
	Client: Drop vm cache (echo 3 > /proc/sys/vm/drop_caches)
		finish reading file

This causes a loop because the client never updates the nfs4_state after
discovering that the delegation is invalid.  This means it will keep
trying to read using the bad delegation rather than attempting to re-open
the file.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
CC: stable@vger.kernel.org [3.4+]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>