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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"
/*----------------------------------------------------------------*/
/*
* Little inline functions that simplify calling the policy methods.
*/
static inline int policy_map(struct dm_cache_policy *p, dm_oblock_t oblock,
bool can_block, bool can_migrate, bool discarded_oblock,
struct bio *bio, struct policy_locker *locker,
struct policy_result *result)
{
return p->map(p, oblock, can_block, can_migrate, discarded_oblock, bio, locker, result);
}
static inline int policy_lookup(struct dm_cache_policy *p, dm_oblock_t oblock, dm_cblock_t *cblock)
{
BUG_ON(!p->lookup);
return p->lookup(p, oblock, cblock);
}
static inline void policy_set_dirty(struct dm_cache_policy *p, dm_oblock_t oblock)
{
if (p->set_dirty)
p->set_dirty(p, oblock);
}
static inline void policy_clear_dirty(struct dm_cache_policy *p, dm_oblock_t oblock)
{
if (p->clear_dirty)
p->clear_dirty(p, oblock);
}
static inline int policy_load_mapping(struct dm_cache_policy *p,
dm_oblock_t oblock, dm_cblock_t cblock,
uint32_t hint, bool hint_valid)
{
return p->load_mapping(p, oblock, cblock, hint, hint_valid);
}
static inline int policy_walk_mappings(struct dm_cache_policy *p,
policy_walk_fn fn, void *context)
{
return p->walk_mappings ? p->walk_mappings(p, fn, context) : 0;
}
static inline int policy_writeback_work(struct dm_cache_policy *p,
dm_oblock_t *oblock,
dm_cblock_t *cblock,
bool critical_only)
{
return p->writeback_work ? p->writeback_work(p, oblock, cblock, critical_only) : -ENOENT;
}
static inline void policy_remove_mapping(struct dm_cache_policy *p, dm_oblock_t oblock)
{
p->remove_mapping(p, oblock);
}
static inline int policy_remove_cblock(struct dm_cache_policy *p, dm_cblock_t cblock)
{
return p->remove_cblock(p, cblock);
}
static inline void policy_force_mapping(struct dm_cache_policy *p,
dm_oblock_t current_oblock, dm_oblock_t new_oblock)
{
return p->force_mapping(p, current_oblock, new_oblock);
}
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)
{
if (p->tick)
return p->tick(p);
}
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;
}
/*----------------------------------------------------------------*/
/*
* 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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