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Commit 451b9e00 authored by Joe Thornber's avatar Joe Thornber Committed by Mike Snitzer
Browse files

dm cache: pull out some bitset utility functions for reuse 



Signed-off-by: default avatarJoe Thornber <ejt@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent 20f6814b

drivers/md/dm-cache-policy-internal.h

+28 −0
Original line number Diff line number Diff line
@@ -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"



/*----------------------------------------------------------------*/
@@ -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.

 */

drivers/md/dm-cache-target.c

+0 −24
Original line number Diff line number Diff line
@@ -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

 * work before calling its endio function.  We do this by temporarily