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/*
* Copyright (C) 2012 Red Hat. All rights reserved.
*
* This file is released under the GPL.
*/
#ifndef DM_CACHE_POLICY_INTERNAL_H
#define DM_CACHE_POLICY_INTERNAL_H
#include <linux/vmalloc.h>
#include "dm-cache-policy.h"
/*----------------------------------------------------------------*/
static inline int policy_lookup(struct dm_cache_policy *p, dm_oblock_t oblock, dm_cblock_t *cblock,
int data_dir, bool fast_copy, bool *background_queued)
{
return p->lookup(p, oblock, cblock, data_dir, fast_copy, background_queued);
}
static inline int policy_lookup_with_work(struct dm_cache_policy *p,
dm_oblock_t oblock, dm_cblock_t *cblock,
int data_dir, bool fast_copy,
struct policy_work **work)
{
if (!p->lookup_with_work) {
*work = NULL;
return p->lookup(p, oblock, cblock, data_dir, fast_copy, NULL);
}
return p->lookup_with_work(p, oblock, cblock, data_dir, fast_copy, work);
}
static inline int policy_get_background_work(struct dm_cache_policy *p,
bool idle, struct policy_work **result)
{
return p->get_background_work(p, idle, result);
}
static inline void policy_complete_background_work(struct dm_cache_policy *p,
struct policy_work *work,
bool success)
{
return p->complete_background_work(p, work, success);
}
static inline void policy_set_dirty(struct dm_cache_policy *p, dm_cblock_t cblock)
{
p->set_dirty(p, cblock);
}
static inline void policy_clear_dirty(struct dm_cache_policy *p, dm_cblock_t cblock)
{
p->clear_dirty(p, cblock);
}
static inline int policy_load_mapping(struct dm_cache_policy *p,
dm_oblock_t oblock, dm_cblock_t cblock,
bool dirty, uint32_t hint, bool hint_valid)
{
return p->load_mapping(p, oblock, cblock, dirty, hint, hint_valid);
}
static inline int policy_invalidate_mapping(struct dm_cache_policy *p,
dm_cblock_t cblock)
{
return p->invalidate_mapping(p, cblock);
}
static inline uint32_t policy_get_hint(struct dm_cache_policy *p,
dm_cblock_t cblock)
{
return p->get_hint ? p->get_hint(p, cblock) : 0;
}
static inline dm_cblock_t policy_residency(struct dm_cache_policy *p)
{
return p->residency(p);
}
static inline void policy_tick(struct dm_cache_policy *p, bool can_block)
{
if (p->tick)
return p->tick(p, can_block);
}
static inline int policy_emit_config_values(struct dm_cache_policy *p, char *result,
unsigned maxlen, ssize_t *sz_ptr)
{
ssize_t sz = *sz_ptr;
if (p->emit_config_values)
return p->emit_config_values(p, result, maxlen, sz_ptr);
DMEMIT("0 ");
*sz_ptr = sz;
return 0;
}
static inline int policy_set_config_value(struct dm_cache_policy *p,
const char *key, const char *value)
{
return p->set_config_value ? p->set_config_value(p, key, value) : -EINVAL;
}
static inline void policy_allow_migrations(struct dm_cache_policy *p, bool allow)
{
return p->allow_migrations(p, allow);
}
/*----------------------------------------------------------------*/
/*
* Some utility functions commonly used by policies and the core target.
*/
static inline size_t bitset_size_in_bytes(unsigned nr_entries)
{
return sizeof(unsigned long) * dm_div_up(nr_entries, BITS_PER_LONG);
}
static inline unsigned long *alloc_bitset(unsigned nr_entries)
{
size_t s = bitset_size_in_bytes(nr_entries);
return vzalloc(s);
}
static inline void clear_bitset(void *bitset, unsigned nr_entries)
{
size_t s = bitset_size_in_bytes(nr_entries);
memset(bitset, 0, s);
}
static inline void free_bitset(unsigned long *bits)
{
vfree(bits);
}
/*----------------------------------------------------------------*/
/*
* Creates a new cache policy given a policy name, a cache size, an origin size and the block size.
*/
struct dm_cache_policy *dm_cache_policy_create(const char *name, dm_cblock_t cache_size,
sector_t origin_size, sector_t block_size);
/*
* Destroys the policy. This drops references to the policy module as well
* as calling it's destroy method. So always use this rather than calling
* the policy->destroy method directly.
*/
void dm_cache_policy_destroy(struct dm_cache_policy *p);
/*
* In case we've forgotten.
*/
const char *dm_cache_policy_get_name(struct dm_cache_policy *p);
const unsigned *dm_cache_policy_get_version(struct dm_cache_policy *p);
size_t dm_cache_policy_get_hint_size(struct dm_cache_policy *p);
/*----------------------------------------------------------------*/
#endif /* DM_CACHE_POLICY_INTERNAL_H */
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