1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * Copyright (C) 2017 Red Hat. All rights reserved. 3*4882a593Smuzhiyun * 4*4882a593Smuzhiyun * This file is released under the GPL. 5*4882a593Smuzhiyun */ 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun #ifndef DM_CACHE_BACKGROUND_WORK_H 8*4882a593Smuzhiyun #define DM_CACHE_BACKGROUND_WORK_H 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #include <linux/vmalloc.h> 11*4882a593Smuzhiyun #include "dm-cache-policy.h" 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun /*----------------------------------------------------------------*/ 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun struct background_work; 16*4882a593Smuzhiyun struct background_tracker; 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun /* 19*4882a593Smuzhiyun * FIXME: discuss lack of locking in all methods. 20*4882a593Smuzhiyun */ 21*4882a593Smuzhiyun struct background_tracker *btracker_create(unsigned max_work); 22*4882a593Smuzhiyun void btracker_destroy(struct background_tracker *b); 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun unsigned btracker_nr_writebacks_queued(struct background_tracker *b); 25*4882a593Smuzhiyun unsigned btracker_nr_demotions_queued(struct background_tracker *b); 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun /* 28*4882a593Smuzhiyun * returns -EINVAL iff the work is already queued. -ENOMEM if the work 29*4882a593Smuzhiyun * couldn't be queued for another reason. 30*4882a593Smuzhiyun */ 31*4882a593Smuzhiyun int btracker_queue(struct background_tracker *b, 32*4882a593Smuzhiyun struct policy_work *work, 33*4882a593Smuzhiyun struct policy_work **pwork); 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun /* 36*4882a593Smuzhiyun * Returns -ENODATA if there's no work. 37*4882a593Smuzhiyun */ 38*4882a593Smuzhiyun int btracker_issue(struct background_tracker *b, struct policy_work **work); 39*4882a593Smuzhiyun void btracker_complete(struct background_tracker *b, 40*4882a593Smuzhiyun struct policy_work *op); 41*4882a593Smuzhiyun bool btracker_promotion_already_present(struct background_tracker *b, 42*4882a593Smuzhiyun dm_oblock_t oblock); 43*4882a593Smuzhiyun 44*4882a593Smuzhiyun /*----------------------------------------------------------------*/ 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun #endif 47