lockd: move lockd's grace period handling into its own module

Currently, all of the grace period handling is part of lockd. Eventually
though we'd like to be able to build v4-only servers, at which point
we'll need to put all of this elsewhere.

Move the code itself into fs/nfs_common and have it build a grace.ko
module. Then, rejigger the Kconfig options so that both nfsd and lockd
enable it automatically.

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

1 files changed, 0 insertions, 65 deletions

diff --git a/fs/lockd/grace.c b/fs/lockd/grace.c
deleted file mode 100644
index 6d1ee7204c88..000000000000
--- a/fs/lockd/grace.c
+++ /dev/null
@@ -1,65 +0,0 @@
-/*
- * Common code for control of lockd and nfsv4 grace periods.
- */
-
-#include <linux/module.h>
-#include <linux/lockd/bind.h>
-#include <net/net_namespace.h>
-
-#include "netns.h"
-
-static DEFINE_SPINLOCK(grace_lock);
-
-/**
- * locks_start_grace
- * @lm: who this grace period is for
- *
- * A grace period is a period during which locks should not be given
- * out.  Currently grace periods are only enforced by the two lock
- * managers (lockd and nfsd), using the locks_in_grace() function to
- * check when they are in a grace period.
- *
- * This function is called to start a grace period.
- */
-void locks_start_grace(struct net *net, struct lock_manager *lm)
-{
-	struct lockd_net *ln = net_generic(net, lockd_net_id);
-
-	spin_lock(&grace_lock);
-	list_add(&lm->list, &ln->grace_list);
-	spin_unlock(&grace_lock);
-}
-EXPORT_SYMBOL_GPL(locks_start_grace);
-
-/**
- * locks_end_grace
- * @lm: who this grace period is for
- *
- * Call this function to state that the given lock manager is ready to
- * resume regular locking.  The grace period will not end until all lock
- * managers that called locks_start_grace() also call locks_end_grace().
- * Note that callers count on it being safe to call this more than once,
- * and the second call should be a no-op.
- */
-void locks_end_grace(struct lock_manager *lm)
-{
-	spin_lock(&grace_lock);
-	list_del_init(&lm->list);
-	spin_unlock(&grace_lock);
-}
-EXPORT_SYMBOL_GPL(locks_end_grace);
-
-/**
- * locks_in_grace
- *
- * Lock managers call this function to determine when it is OK for them
- * to answer ordinary lock requests, and when they should accept only
- * lock reclaims.
- */
-int locks_in_grace(struct net *net)
-{
-	struct lockd_net *ln = net_generic(net, lockd_net_id);
-
-	return !list_empty(&ln->grace_list);
-}
-EXPORT_SYMBOL_GPL(locks_in_grace);