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