1 /* 2 * Copyright (C) 2017 Red Hat. All rights reserved. 3 * 4 * This file is released under the GPL. 5 */ 6 7 #ifndef DM_CACHE_BACKGROUND_WORK_H 8 #define DM_CACHE_BACKGROUND_WORK_H 9 10 #include <linux/vmalloc.h> 11 #include "dm-cache-policy.h" 12 13 /*----------------------------------------------------------------*/ 14 15 struct background_work; 16 struct background_tracker; 17 18 /* 19 * FIXME: discuss lack of locking in all methods. 20 */ 21 struct background_tracker *btracker_create(unsigned max_work); 22 void btracker_destroy(struct background_tracker *b); 23 24 unsigned btracker_nr_writebacks_queued(struct background_tracker *b); 25 unsigned btracker_nr_demotions_queued(struct background_tracker *b); 26 27 /* 28 * returns -EINVAL iff the work is already queued. -ENOMEM if the work 29 * couldn't be queued for another reason. 30 */ 31 int btracker_queue(struct background_tracker *b, 32 struct policy_work *work, 33 struct policy_work **pwork); 34 35 /* 36 * Returns -ENODATA if there's no work. 37 */ 38 int btracker_issue(struct background_tracker *b, struct policy_work **work); 39 void btracker_complete(struct background_tracker *b, 40 struct policy_work *op); 41 bool btracker_promotion_already_present(struct background_tracker *b, 42 dm_oblock_t oblock); 43 44 /*----------------------------------------------------------------*/ 45 46 #endif 47