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/******************************************************************************
*
* Copyright (c) 2009 Citrix Systems, Inc. (Grzegorz Milos)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __BIDIR_HASH_H__
#define __BIDIR_HASH_H__
#include <stdint.h>
#include <string.h>
#include "memshr-priv.h"
typedef struct vbdblk {
uint64_t sec;
uint16_t disk_id;
} vbdblk_t;
#if defined FINGERPRINT_MAP || BLOCK_MAP
#define DEFINE_SINGLE_MAP
#endif
/*******************************************************/
/* Fingerprint map */
/*******************************************************/
#if defined FINGERPRINT_MAP || !defined DEFINE_SINGLE_MAP
#undef BIDIR_NAME_PREFIX
#undef BIDIR_KEY
#undef BIDIR_VALUE
#undef BIDIR_KEY_T
#undef BIDIR_VALUE_T
static uint32_t fgprtshr_fgprt_hash(uint32_t h)
{
return h;
}
static uint32_t fgprtshr_mfn_hash(uint64_t m)
{
return (uint32_t)m;
}
static int fgprtshr_fgprt_cmp(uint32_t h1, uint32_t h2)
{
return (h1 == h2);
}
static int fgprtshr_mfn_cmp(uint32_t m1, uint32_t m2)
{
return (m1 == m2);
}
#define BIDIR_NAME_PREFIX fgprtshr
#define BIDIR_KEY fgprt
#define BIDIR_VALUE mfn
#define BIDIR_KEY_T uint32_t
#define BIDIR_VALUE_T xen_mfn_t
#include "bidir-namedefs.h"
#endif /* FINGERPRINT_MAP */
/*******************************************************/
/* Block<->Memory sharing handles */
/*******************************************************/
#if defined BLOCK_MAP || !defined DEFINE_SINGLE_MAP
#undef BIDIR_NAME_PREFIX
#undef BIDIR_KEY
#undef BIDIR_VALUE
#undef BIDIR_KEY_T
#undef BIDIR_VALUE_T
/* TODO better hashes! */
static inline uint32_t blockshr_block_hash(vbdblk_t block)
{
return (uint32_t)(block.sec) ^ (uint32_t)(block.disk_id);
}
static inline uint32_t blockshr_shrhnd_hash(share_tuple_t shrhnd)
{
return ((uint32_t) shrhnd.handle);
}
static inline int blockshr_block_cmp(vbdblk_t b1, vbdblk_t b2)
{
return (b1.sec == b2.sec) && (b1.disk_id == b2.disk_id);
}
static inline int blockshr_shrhnd_cmp(share_tuple_t h1, share_tuple_t h2)
{
return ( !memcmp(&h1, &h2, sizeof(share_tuple_t)) );
}
#define BIDIR_NAME_PREFIX blockshr
#define BIDIR_KEY block
#define BIDIR_VALUE shrhnd
#define BIDIR_KEY_T vbdblk_t
#define BIDIR_VALUE_T share_tuple_t
#include "bidir-namedefs.h"
#endif /* BLOCK_MAP */
#endif /* __BIDIR_HASH_H__ */
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