[PATCH RFC v16 02/11] NFSD: Add client flags, macro and spinlock to support courteous server

[Dai Ngo <dai.ngo@oracle.com>]

Add flags to track a client's lease state after the client fails to
renew its lease. Add macro for courtesy client expire time. Add spinlock
to synchronize access to these flags. Modify alloc_client to initialize
these fields.

Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
---
 fs/nfsd/nfs4state.c | 2 ++
 fs/nfsd/nfsd.h      | 1 +
 fs/nfsd/state.h     | 6 ++++++
 3 files changed, 9 insertions(+)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 234e852fcdfa..a65d59510681 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2009,12 +2009,14 @@ static struct nfs4_client *alloc_client(struct xdr_netobj name)
 	INIT_LIST_HEAD(&clp->cl_delegations);
 	INIT_LIST_HEAD(&clp->cl_lru);
 	INIT_LIST_HEAD(&clp->cl_revoked);
+	INIT_LIST_HEAD(&clp->cl_cs_list);
 #ifdef CONFIG_NFSD_PNFS
 	INIT_LIST_HEAD(&clp->cl_lo_states);
 #endif
 	INIT_LIST_HEAD(&clp->async_copies);
 	spin_lock_init(&clp->async_lock);
 	spin_lock_init(&clp->cl_lock);
+	spin_lock_init(&clp->cl_cs_lock);
 	rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
 	return clp;
 err_no_hashtbl:
diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
index 4fc1fd639527..23996c6ca75e 100644
--- a/fs/nfsd/nfsd.h
+++ b/fs/nfsd/nfsd.h
@@ -336,6 +336,7 @@ void		nfsd_lockd_shutdown(void);
 #define COMPOUND_ERR_SLACK_SPACE	16     /* OP_SETATTR */
 
 #define NFSD_LAUNDROMAT_MINTIMEOUT      1   /* seconds */
+#define	NFSD_COURTESY_CLIENT_TIMEOUT	(24 * 60 * 60)	/* seconds */
 
 /*
  * The following attributes are currently not supported by the NFSv4 server:
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 95457cfd37fc..8cbd3b69a584 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -343,6 +343,9 @@ struct nfs4_client {
 #define NFSD4_CLIENT_RECLAIM_COMPLETE	(3)	/* reclaim_complete done */
 #define NFSD4_CLIENT_CONFIRMED		(4)	/* client is confirmed */
 #define NFSD4_CLIENT_UPCALL_LOCK	(5)	/* upcall serialization */
+#define	NFSD4_CLIENT_COURTESY		(6)
+#define	NFSD4_CLIENT_EXPIRED		(7)
+#define	NFSD4_CLIENT_RECONNECTED	(8)
 #define NFSD4_CLIENT_CB_FLAG_MASK	(1 << NFSD4_CLIENT_CB_UPDATE | \
 					 1 << NFSD4_CLIENT_CB_KILL)
 	unsigned long		cl_flags;
@@ -385,6 +388,9 @@ struct nfs4_client {
 	struct list_head	async_copies;	/* list of async copies */
 	spinlock_t		async_lock;	/* lock for async copies */
 	atomic_t		cl_cb_inflight;	/* Outstanding callbacks */
+
+	spinlock_t		cl_cs_lock;
+	struct list_head	cl_cs_list;
 };
 
 /* struct nfs4_client_reset
-- 
2.9.5