| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 |