mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![Joe Thornber](/assets/img/avatar_default.png)
It's far quicker to always delete the hint array and recreate with dm_array_new() because we avoid the copying caused by mutation. Also simplifies the policy interface, replacing the walk_hints() with the simpler get_hint(). Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
163 lines
4.4 KiB
C
163 lines
4.4 KiB
C
/*
|
|
* 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 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 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, 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;
|
|
}
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
/*
|
|
* 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 */
|