2 * Common code for control of lockd and nfsv4 grace periods.
5 #include <linux/module.h>
6 #include <linux/lockd/bind.h>
8 static LIST_HEAD(grace_list
);
9 static DEFINE_SPINLOCK(grace_lock
);
13 * @lm: who this grace period is for
15 * A grace period is a period during which locks should not be given
16 * out. Currently grace periods are only enforced by the two lock
17 * managers (lockd and nfsd), using the locks_in_grace() function to
18 * check when they are in a grace period.
20 * This function is called to start a grace period.
22 void locks_start_grace(struct lock_manager
*lm
)
24 spin_lock(&grace_lock
);
25 list_add(&lm
->list
, &grace_list
);
26 spin_unlock(&grace_lock
);
28 EXPORT_SYMBOL_GPL(locks_start_grace
);
32 * @lm: who this grace period is for
34 * Call this function to state that the given lock manager is ready to
35 * resume regular locking. The grace period will not end until all lock
36 * managers that called locks_start_grace() also call locks_end_grace().
37 * Note that callers count on it being safe to call this more than once,
38 * and the second call should be a no-op.
40 void locks_end_grace(struct lock_manager
*lm
)
42 spin_lock(&grace_lock
);
43 list_del_init(&lm
->list
);
44 spin_unlock(&grace_lock
);
46 EXPORT_SYMBOL_GPL(locks_end_grace
);
51 * Lock managers call this function to determine when it is OK for them
52 * to answer ordinary lock requests, and when they should accept only
55 int locks_in_grace(void)
57 return !list_empty(&grace_list
);
59 EXPORT_SYMBOL_GPL(locks_in_grace
);
This page took 0.031019 seconds and 5 git commands to generate.