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b29d4986 JT |
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 |