Linux Audio

Check our new training course

Loading...
v6.2
  1/*
  2 * Copyright (C) 2012 Red Hat. All rights reserved.
  3 *
  4 * This file is released under the GPL.
  5 */
  6
  7#ifndef DM_CACHE_POLICY_INTERNAL_H
  8#define DM_CACHE_POLICY_INTERNAL_H
  9
 10#include <linux/vmalloc.h>
 11#include "dm-cache-policy.h"
 12
 13/*----------------------------------------------------------------*/
 14
 15static inline int policy_lookup(struct dm_cache_policy *p, dm_oblock_t oblock, dm_cblock_t *cblock,
 16				int data_dir, bool fast_copy, bool *background_queued)
 
 
 
 
 17{
 18	return p->lookup(p, oblock, cblock, data_dir, fast_copy, background_queued);
 19}
 20
 21static inline int policy_lookup_with_work(struct dm_cache_policy *p,
 22					  dm_oblock_t oblock, dm_cblock_t *cblock,
 23					  int data_dir, bool fast_copy,
 24					  struct policy_work **work)
 25{
 26	if (!p->lookup_with_work) {
 27		*work = NULL;
 28		return p->lookup(p, oblock, cblock, data_dir, fast_copy, NULL);
 29	}
 30
 31	return p->lookup_with_work(p, oblock, cblock, data_dir, fast_copy, work);
 
 
 
 32}
 33
 34static inline int policy_get_background_work(struct dm_cache_policy *p,
 35					     bool idle, struct policy_work **result)
 36{
 37	return p->get_background_work(p, idle, result);
 
 38}
 39
 40static inline void policy_complete_background_work(struct dm_cache_policy *p,
 41						   struct policy_work *work,
 42						   bool success)
 43{
 44	return p->complete_background_work(p, work, success);
 45}
 46
 47static inline void policy_set_dirty(struct dm_cache_policy *p, dm_cblock_t cblock)
 
 48{
 49	p->set_dirty(p, cblock);
 50}
 51
 52static inline void policy_clear_dirty(struct dm_cache_policy *p, dm_cblock_t cblock)
 
 
 53{
 54	p->clear_dirty(p, cblock);
 55}
 56
 57static inline int policy_load_mapping(struct dm_cache_policy *p,
 58				      dm_oblock_t oblock, dm_cblock_t cblock,
 59				      bool dirty, uint32_t hint, bool hint_valid)
 60{
 61	return p->load_mapping(p, oblock, cblock, dirty, hint, hint_valid);
 62}
 63
 64static inline int policy_invalidate_mapping(struct dm_cache_policy *p,
 65					    dm_cblock_t cblock)
 66{
 67	return p->invalidate_mapping(p, cblock);
 68}
 69
 70static inline uint32_t policy_get_hint(struct dm_cache_policy *p,
 71				       dm_cblock_t cblock)
 72{
 73	return p->get_hint ? p->get_hint(p, cblock) : 0;
 74}
 75
 76static inline dm_cblock_t policy_residency(struct dm_cache_policy *p)
 77{
 78	return p->residency(p);
 79}
 80
 81static inline void policy_tick(struct dm_cache_policy *p, bool can_block)
 82{
 83	if (p->tick)
 84		return p->tick(p, can_block);
 85}
 86
 87static inline int policy_emit_config_values(struct dm_cache_policy *p, char *result,
 88					    unsigned maxlen, ssize_t *sz_ptr)
 89{
 90	ssize_t sz = *sz_ptr;
 91	if (p->emit_config_values)
 92		return p->emit_config_values(p, result, maxlen, sz_ptr);
 93
 94	DMEMIT("0 ");
 95	*sz_ptr = sz;
 96	return 0;
 97}
 98
 99static inline int policy_set_config_value(struct dm_cache_policy *p,
100					  const char *key, const char *value)
101{
102	return p->set_config_value ? p->set_config_value(p, key, value) : -EINVAL;
103}
104
105static inline void policy_allow_migrations(struct dm_cache_policy *p, bool allow)
106{
107	return p->allow_migrations(p, allow);
108}
109
110/*----------------------------------------------------------------*/
111
112/*
113 * Some utility functions commonly used by policies and the core target.
114 */
115static inline size_t bitset_size_in_bytes(unsigned nr_entries)
116{
117	return sizeof(unsigned long) * dm_div_up(nr_entries, BITS_PER_LONG);
118}
119
120static inline unsigned long *alloc_bitset(unsigned nr_entries)
121{
122	size_t s = bitset_size_in_bytes(nr_entries);
123	return vzalloc(s);
124}
125
126static inline void clear_bitset(void *bitset, unsigned nr_entries)
127{
128	size_t s = bitset_size_in_bytes(nr_entries);
129	memset(bitset, 0, s);
130}
131
132static inline void free_bitset(unsigned long *bits)
133{
134	vfree(bits);
135}
136
137/*----------------------------------------------------------------*/
138
139/*
140 * Creates a new cache policy given a policy name, a cache size, an origin size and the block size.
141 */
142struct dm_cache_policy *dm_cache_policy_create(const char *name, dm_cblock_t cache_size,
143					       sector_t origin_size, sector_t block_size);
144
145/*
146 * Destroys the policy.  This drops references to the policy module as well
147 * as calling it's destroy method.  So always use this rather than calling
148 * the policy->destroy method directly.
149 */
150void dm_cache_policy_destroy(struct dm_cache_policy *p);
151
152/*
153 * In case we've forgotten.
154 */
155const char *dm_cache_policy_get_name(struct dm_cache_policy *p);
156
157const unsigned *dm_cache_policy_get_version(struct dm_cache_policy *p);
158
159size_t dm_cache_policy_get_hint_size(struct dm_cache_policy *p);
160
161/*----------------------------------------------------------------*/
162
163#endif /* DM_CACHE_POLICY_INTERNAL_H */
v3.15
  1/*
  2 * Copyright (C) 2012 Red Hat. All rights reserved.
  3 *
  4 * This file is released under the GPL.
  5 */
  6
  7#ifndef DM_CACHE_POLICY_INTERNAL_H
  8#define DM_CACHE_POLICY_INTERNAL_H
  9
 
 10#include "dm-cache-policy.h"
 11
 12/*----------------------------------------------------------------*/
 13
 14/*
 15 * Little inline functions that simplify calling the policy methods.
 16 */
 17static inline int policy_map(struct dm_cache_policy *p, dm_oblock_t oblock,
 18			     bool can_block, bool can_migrate, bool discarded_oblock,
 19			     struct bio *bio, struct policy_result *result)
 20{
 21	return p->map(p, oblock, can_block, can_migrate, discarded_oblock, bio, result);
 22}
 23
 24static inline int policy_lookup(struct dm_cache_policy *p, dm_oblock_t oblock, dm_cblock_t *cblock)
 
 
 
 25{
 26	BUG_ON(!p->lookup);
 27	return p->lookup(p, oblock, cblock);
 28}
 
 29
 30static inline void policy_set_dirty(struct dm_cache_policy *p, dm_oblock_t oblock)
 31{
 32	if (p->set_dirty)
 33		p->set_dirty(p, oblock);
 34}
 35
 36static inline void policy_clear_dirty(struct dm_cache_policy *p, dm_oblock_t oblock)
 
 37{
 38	if (p->clear_dirty)
 39		p->clear_dirty(p, oblock);
 40}
 41
 42static inline int policy_load_mapping(struct dm_cache_policy *p,
 43				      dm_oblock_t oblock, dm_cblock_t cblock,
 44				      uint32_t hint, bool hint_valid)
 45{
 46	return p->load_mapping(p, oblock, cblock, hint, hint_valid);
 47}
 48
 49static inline int policy_walk_mappings(struct dm_cache_policy *p,
 50				      policy_walk_fn fn, void *context)
 51{
 52	return p->walk_mappings ? p->walk_mappings(p, fn, context) : 0;
 53}
 54
 55static inline int policy_writeback_work(struct dm_cache_policy *p,
 56					dm_oblock_t *oblock,
 57					dm_cblock_t *cblock)
 58{
 59	return p->writeback_work ? p->writeback_work(p, oblock, cblock) : -ENOENT;
 60}
 61
 62static inline void policy_remove_mapping(struct dm_cache_policy *p, dm_oblock_t oblock)
 
 
 63{
 64	p->remove_mapping(p, oblock);
 65}
 66
 67static inline int policy_remove_cblock(struct dm_cache_policy *p, dm_cblock_t cblock)
 
 68{
 69	return p->remove_cblock(p, cblock);
 70}
 71
 72static inline void policy_force_mapping(struct dm_cache_policy *p,
 73					dm_oblock_t current_oblock, dm_oblock_t new_oblock)
 74{
 75	return p->force_mapping(p, current_oblock, new_oblock);
 76}
 77
 78static inline dm_cblock_t policy_residency(struct dm_cache_policy *p)
 79{
 80	return p->residency(p);
 81}
 82
 83static inline void policy_tick(struct dm_cache_policy *p)
 84{
 85	if (p->tick)
 86		return p->tick(p);
 87}
 88
 89static inline int policy_emit_config_values(struct dm_cache_policy *p, char *result, unsigned maxlen)
 
 90{
 91	ssize_t sz = 0;
 92	if (p->emit_config_values)
 93		return p->emit_config_values(p, result, maxlen);
 94
 95	DMEMIT("0");
 
 96	return 0;
 97}
 98
 99static inline int policy_set_config_value(struct dm_cache_policy *p,
100					  const char *key, const char *value)
101{
102	return p->set_config_value ? p->set_config_value(p, key, value) : -EINVAL;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
103}
104
105/*----------------------------------------------------------------*/
106
107/*
108 * Creates a new cache policy given a policy name, a cache size, an origin size and the block size.
109 */
110struct dm_cache_policy *dm_cache_policy_create(const char *name, dm_cblock_t cache_size,
111					       sector_t origin_size, sector_t block_size);
112
113/*
114 * Destroys the policy.  This drops references to the policy module as well
115 * as calling it's destroy method.  So always use this rather than calling
116 * the policy->destroy method directly.
117 */
118void dm_cache_policy_destroy(struct dm_cache_policy *p);
119
120/*
121 * In case we've forgotten.
122 */
123const char *dm_cache_policy_get_name(struct dm_cache_policy *p);
124
125const unsigned *dm_cache_policy_get_version(struct dm_cache_policy *p);
126
127size_t dm_cache_policy_get_hint_size(struct dm_cache_policy *p);
128
129/*----------------------------------------------------------------*/
130
131#endif /* DM_CACHE_POLICY_INTERNAL_H */