diff options
Diffstat (limited to 'drivers/md/dm-cache-policy-internal.h')
| -rw-r--r-- | drivers/md/dm-cache-policy-internal.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/md/dm-cache-policy-internal.h b/drivers/md/dm-cache-policy-internal.h index 776c685167e6..9dc05a52369e 100644 --- a/drivers/md/dm-cache-policy-internal.h +++ b/drivers/md/dm-cache-policy-internal.h @@ -7,6 +7,7 @@ #ifndef DM_CACHE_POLICY_INTERNAL_H #define DM_CACHE_POLICY_INTERNAL_H +#include <linux/vmalloc.h> #include "dm-cache-policy.h" /*----------------------------------------------------------------*/ @@ -107,6 +108,33 @@ static inline int policy_set_config_value(struct dm_cache_policy *p, /*----------------------------------------------------------------*/ /* + * 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, |