2 * Common code for control of lockd and nfsv4 grace periods.
5 #include <linux/module.h>
6 #include <linux/lockd/bind.h>
7 #include <net/net_namespace.h>
11 static DEFINE_SPINLOCK(grace_lock
);
15 * @lm: who this grace period is for
17 * A grace period is a period during which locks should not be given
18 * out. Currently grace periods are only enforced by the two lock
19 * managers (lockd and nfsd), using the locks_in_grace() function to
20 * check when they are in a grace period.
22 * This function is called to start a grace period.
24 void locks_start_grace(struct net
*net
, struct lock_manager
*lm
)
26 struct lockd_net
*ln
= net_generic(net
, lockd_net_id
);
28 spin_lock(&grace_lock
);
29 list_add(&lm
->list
, &ln
->grace_list
);
30 spin_unlock(&grace_lock
);
32 EXPORT_SYMBOL_GPL(locks_start_grace
);
36 * @lm: who this grace period is for
38 * Call this function to state that the given lock manager is ready to
39 * resume regular locking. The grace period will not end until all lock
40 * managers that called locks_start_grace() also call locks_end_grace().
41 * Note that callers count on it being safe to call this more than once,
42 * and the second call should be a no-op.
44 void locks_end_grace(struct lock_manager
*lm
)
46 spin_lock(&grace_lock
);
47 list_del_init(&lm
->list
);
48 spin_unlock(&grace_lock
);
50 EXPORT_SYMBOL_GPL(locks_end_grace
);
55 * Lock managers call this function to determine when it is OK for them
56 * to answer ordinary lock requests, and when they should accept only
59 int locks_in_grace(struct net
*net
)
61 struct lockd_net
*ln
= net_generic(net
, lockd_net_id
);
63 return !list_empty(&ln
->grace_list
);
65 EXPORT_SYMBOL_GPL(locks_in_grace
);
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