diff options
Diffstat (limited to 'drivers/md/dm-cache-background-tracker.h')
| -rw-r--r-- | drivers/md/dm-cache-background-tracker.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/md/dm-cache-background-tracker.h b/drivers/md/dm-cache-background-tracker.h new file mode 100644 index 000000000..27ab90dbc --- /dev/null +++ b/drivers/md/dm-cache-background-tracker.h @@ -0,0 +1,46 @@ +/* + * 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 |