263 	struct dm_deferred_set *ds;  member
278 	struct dm_deferred_set *ds;  in dm_deferred_set_create()  local
280 	ds = kmalloc(sizeof(*ds), GFP_KERNEL);  in dm_deferred_set_create()
281 	if (!ds)  in dm_deferred_set_create()
284 	spin_lock_init(&ds->lock);  in dm_deferred_set_create()
285 	ds->current_entry = 0;  in dm_deferred_set_create()
286 	ds->sweeper = 0;  in dm_deferred_set_create()
288 		ds->entries[i].ds = ds;  in dm_deferred_set_create()
289 		ds->entries[i].count = 0;  in dm_deferred_set_create()
290 		INIT_LIST_HEAD(&ds->entries[i].work_items);  in dm_deferred_set_create()
293 	return ds;  in dm_deferred_set_create()
297 void dm_deferred_set_destroy(struct dm_deferred_set *ds)  in dm_deferred_set_destroy()  argument
299 	kfree(ds);  in dm_deferred_set_destroy()
303 struct dm_deferred_entry *dm_deferred_entry_inc(struct dm_deferred_set *ds)  in dm_deferred_entry_inc()  argument
308 	spin_lock_irqsave(&ds->lock, flags);  in dm_deferred_entry_inc()
309 	entry = ds->entries + ds->current_entry;  in dm_deferred_entry_inc()
311 	spin_unlock_irqrestore(&ds->lock, flags);  in dm_deferred_entry_inc()
322 static void __sweep(struct dm_deferred_set *ds, struct list_head *head)  in __sweep()  argument
324 	while ((ds->sweeper != ds->current_entry) &&  in __sweep()
325 	       !ds->entries[ds->sweeper].count) {  in __sweep()
326 		list_splice_init(&ds->entries[ds->sweeper].work_items, head);  in __sweep()
327 		ds->sweeper = ds_next(ds->sweeper);  in __sweep()
330 	if ((ds->sweeper == ds->current_entry) && !ds->entries[ds->sweeper].count)  in __sweep()
331 		list_splice_init(&ds->entries[ds->sweeper].work_items, head);  in __sweep()
338 	spin_lock_irqsave(&entry->ds->lock, flags);  in dm_deferred_entry_dec()
341 	__sweep(entry->ds, head);  in dm_deferred_entry_dec()
342 	spin_unlock_irqrestore(&entry->ds->lock, flags);  in dm_deferred_entry_dec()
349 int dm_deferred_set_add_work(struct dm_deferred_set *ds, struct list_head *work)  in dm_deferred_set_add_work()  argument
355 	spin_lock_irqsave(&ds->lock, flags);  in dm_deferred_set_add_work()
356 	if ((ds->sweeper == ds->current_entry) &&  in dm_deferred_set_add_work()
357 	    !ds->entries[ds->current_entry].count)  in dm_deferred_set_add_work()
360 		list_add(work, &ds->entries[ds->current_entry].work_items);  in dm_deferred_set_add_work()
361 		next_entry = ds_next(ds->current_entry);  in dm_deferred_set_add_work()
362 		if (!ds->entries[next_entry].count)  in dm_deferred_set_add_work()
363 			ds->current_entry = next_entry;  in dm_deferred_set_add_work()
365 	spin_unlock_irqrestore(&ds->lock, flags);  in dm_deferred_set_add_work()