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