/* * Copyright (C) 2017 Red Hat. All rights reserved. * * This file is released under the GPL. */ #ifndef DM_CACHE_BACKGROUND_WORK_H #define DM_CACHE_BACKGROUND_WORK_H #include <linux/vmalloc.h> #include "dm-cache-policy.h" /*----------------------------------------------------------------*/ struct background_work; struct background_tracker; /* * FIXME: discuss lack of locking in all methods. */ struct background_tracker *btracker_create(unsigned max_work); void btracker_destroy(struct background_tracker *b); unsigned btracker_nr_writebacks_queued(struct background_tracker *b); unsigned btracker_nr_demotions_queued(struct background_tracker *b); /* * returns -EINVAL iff the work is already queued. -ENOMEM if the work * couldn't be queued for another reason. */ int btracker_queue(struct background_tracker *b, struct policy_work *work, struct policy_work **pwork); /* * Returns -ENODATA if there's no work. */ int btracker_issue(struct background_tracker *b, struct policy_work **work); void btracker_complete(struct background_tracker *b, struct policy_work *op); bool btracker_promotion_already_present(struct background_tracker *b, dm_oblock_t oblock); /*----------------------------------------------------------------*/ #endif