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