nfsd: add a v4_end_grace file to /proc/fs/nfsd

Allow a privileged userland process to end the v4 grace period early.
Writing "Y", "y", or "1" to the file will cause the v4 grace period to
be lifted.  The basic idea with this will be to allow the userland
client tracking program to lift the grace period once it knows that no
more clients will be reclaiming state.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index a5fa6909501e..854f0c574ccf 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -545,6 +545,9 @@ extern struct nfs4_client_reclaim *nfs4_client_to_reclaim(const char *name,
                                                         struct nfsd_net *nn);
 extern bool nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn);
 
+/* grace period management */
+void nfsd4_end_grace(struct nfsd_net *nn);
+
 /* nfs4recover operations */
 extern int nfsd4_client_tracking_init(struct net *net);
 extern void nfsd4_client_tracking_exit(struct net *net);