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dm cache: pull out some bitset utility functions for reuse

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Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber
2015-05-15 15:22:02 +01:00
committed by Mike Snitzer
parent 20f6814b94
commit 451b9e0071
2 changed files with 28 additions and 24 deletions
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28
drivers/md/dm-cache-policy-internal.h
View File

@@ -7,6 +7,7 @@
#ifndef DM_CACHE_POLICY_INTERNAL_H #ifndef DM_CACHE_POLICY_INTERNAL_H
#define DM_CACHE_POLICY_INTERNAL_H #define DM_CACHE_POLICY_INTERNAL_H
#include <linux/vmalloc.h>
#include "dm-cache-policy.h" #include "dm-cache-policy.h"
/*----------------------------------------------------------------*/ /*----------------------------------------------------------------*/
@@ -106,6 +107,33 @@ 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. * Creates a new cache policy given a policy name, a cache size, an origin size and the block size.
*/ */

24
drivers/md/dm-cache-target.c
View File

@@ -111,30 +111,6 @@ static void iot_io_end(struct io_tracker *iot, sector_t len)
/*----------------------------------------------------------------*/ /*----------------------------------------------------------------*/
static size_t bitset_size_in_bytes(unsigned nr_entries)
{
return sizeof(unsigned long) * dm_div_up(nr_entries, BITS_PER_LONG);
}
static unsigned long *alloc_bitset(unsigned nr_entries)
{
size_t s = bitset_size_in_bytes(nr_entries);
return vzalloc(s);
}
static void clear_bitset(void *bitset, unsigned nr_entries)
{
size_t s = bitset_size_in_bytes(nr_entries);
memset(bitset, 0, s);
}
static void free_bitset(unsigned long *bits)
{
vfree(bits);
}
/*----------------------------------------------------------------*/
/* /*
* There are a couple of places where we let a bio run, but want to do some * There are a couple of places where we let a bio run, but want to do some
* work before calling its endio function. We do this by temporarily * work before calling its endio function. We do this by temporarily