diff options
Diffstat (limited to 'drivers/md/dm-cache-policy-internal.h')
| -rw-r--r-- | drivers/md/dm-cache-policy-internal.h | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/drivers/md/dm-cache-policy-internal.h b/drivers/md/dm-cache-policy-internal.h new file mode 100644 index 000000000..56f0a23f6 --- /dev/null +++ b/drivers/md/dm-cache-policy-internal.h @@ -0,0 +1,163 @@ +/* + * 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" + +/*----------------------------------------------------------------*/ + +static inline int policy_lookup(struct dm_cache_policy *p, dm_oblock_t oblock, dm_cblock_t *cblock, + int data_dir, bool fast_copy, bool *background_queued) +{ + return p->lookup(p, oblock, cblock, data_dir, fast_copy, background_queued); +} + +static inline int policy_lookup_with_work(struct dm_cache_policy *p, + dm_oblock_t oblock, dm_cblock_t *cblock, + int data_dir, bool fast_copy, + struct policy_work **work) +{ + if (!p->lookup_with_work) { + *work = NULL; + return p->lookup(p, oblock, cblock, data_dir, fast_copy, NULL); + } + + return p->lookup_with_work(p, oblock, cblock, data_dir, fast_copy, work); +} + +static inline int policy_get_background_work(struct dm_cache_policy *p, + bool idle, struct policy_work **result) +{ + return p->get_background_work(p, idle, result); +} + +static inline void policy_complete_background_work(struct dm_cache_policy *p, + struct policy_work *work, + bool success) +{ + return p->complete_background_work(p, work, success); +} + +static inline void policy_set_dirty(struct dm_cache_policy *p, dm_cblock_t cblock) +{ + p->set_dirty(p, cblock); +} + +static inline void policy_clear_dirty(struct dm_cache_policy *p, dm_cblock_t cblock) +{ + p->clear_dirty(p, cblock); +} + +static inline int policy_load_mapping(struct dm_cache_policy *p, + dm_oblock_t oblock, dm_cblock_t cblock, + bool dirty, uint32_t hint, bool hint_valid) +{ + return p->load_mapping(p, oblock, cblock, dirty, hint, hint_valid); +} + +static inline int policy_invalidate_mapping(struct dm_cache_policy *p, + dm_cblock_t cblock) +{ + return p->invalidate_mapping(p, cblock); +} + +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 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; +} + +static inline void policy_allow_migrations(struct dm_cache_policy *p, bool allow) +{ + return p->allow_migrations(p, allow); +} + +/*----------------------------------------------------------------*/ + +/* + * 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 */ |