1b29d4986SJoe Thornber /* 2b29d4986SJoe Thornber * Copyright (C) 2017 Red Hat. All rights reserved. 3b29d4986SJoe Thornber * 4b29d4986SJoe Thornber * This file is released under the GPL. 5b29d4986SJoe Thornber */ 6b29d4986SJoe Thornber 7b29d4986SJoe Thornber #ifndef DM_CACHE_BACKGROUND_WORK_H 8b29d4986SJoe Thornber #define DM_CACHE_BACKGROUND_WORK_H 9b29d4986SJoe Thornber 10b29d4986SJoe Thornber #include <linux/vmalloc.h> 11b29d4986SJoe Thornber #include "dm-cache-policy.h" 12b29d4986SJoe Thornber 13b29d4986SJoe Thornber /*----------------------------------------------------------------*/ 14b29d4986SJoe Thornber 15b29d4986SJoe Thornber struct background_work; 16b29d4986SJoe Thornber struct background_tracker; 17b29d4986SJoe Thornber 18b29d4986SJoe Thornber /* 19b29d4986SJoe Thornber * FIXME: discuss lack of locking in all methods. 20b29d4986SJoe Thornber */ 21b29d4986SJoe Thornber struct background_tracker *btracker_create(unsigned max_work); 22b29d4986SJoe Thornber void btracker_destroy(struct background_tracker *b); 23b29d4986SJoe Thornber 24b29d4986SJoe Thornber unsigned btracker_nr_writebacks_queued(struct background_tracker *b); 25b29d4986SJoe Thornber unsigned btracker_nr_demotions_queued(struct background_tracker *b); 26b29d4986SJoe Thornber 27b29d4986SJoe Thornber /* 28b29d4986SJoe Thornber * returns -EINVAL iff the work is already queued. -ENOMEM if the work 29b29d4986SJoe Thornber * couldn't be queued for another reason. 30b29d4986SJoe Thornber */ 31b29d4986SJoe Thornber int btracker_queue(struct background_tracker *b, 32b29d4986SJoe Thornber struct policy_work *work, 33b29d4986SJoe Thornber struct policy_work **pwork); 34b29d4986SJoe Thornber 35b29d4986SJoe Thornber /* 36b29d4986SJoe Thornber * Returns -ENODATA if there's no work. 37b29d4986SJoe Thornber */ 38b29d4986SJoe Thornber int btracker_issue(struct background_tracker *b, struct policy_work **work); 39b29d4986SJoe Thornber void btracker_complete(struct background_tracker *b, 40b29d4986SJoe Thornber struct policy_work *op); 41b29d4986SJoe Thornber bool btracker_promotion_already_present(struct background_tracker *b, 42b29d4986SJoe Thornber dm_oblock_t oblock); 43b29d4986SJoe Thornber 44b29d4986SJoe Thornber /*----------------------------------------------------------------*/ 45b29d4986SJoe Thornber 46b29d4986SJoe Thornber #endif 47