locks: give lm_break a return value

Christoph suggests:

   "Add a return value to lm_break so that the lock manager can tell the
    core code "you can delete this lease right now".  That gets rid of
    the games with the timeout which require all kinds of race avoidance
    code in the users."

Do that here and have the nfsd lease break routine use it when it detects
that there was a race between setting up the lease and it being broken.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index f419f718e447..ed4e1897099c 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -872,7 +872,7 @@ struct lock_manager_operations {
 	void (*lm_put_owner)(struct file_lock *);
 	void (*lm_notify)(struct file_lock *);	/* unblock callback */
 	int (*lm_grant)(struct file_lock *, int);
-	void (*lm_break)(struct file_lock *);
+	bool (*lm_break)(struct file_lock *);
 	int (*lm_change)(struct file_lock **, int, struct list_head *);
 	void (*lm_setup)(struct file_lock *, void **);
 };