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/*-
* BSD LICENSE
*
* Copyright (c) Intel Corporation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef FTL_ADDR_H
#define FTL_ADDR_H
#include "spdk/stdinc.h"
/* Marks address as invalid */
#define FTL_ADDR_INVALID (-1)
/* Marks LBA as invalid */
#define FTL_LBA_INVALID ((uint64_t)-1)
/* Smallest data unit size */
#define FTL_BLOCK_SIZE 4096
/* This structure represents on-disk address. It can have one of the following */
/* formats: */
/* - offset inside the disk */
/* - cache_offset inside the cache (indicated by the cached flag) */
/* - packed version of the two formats above (can be only used when the */
/* offset can be represented in less than 32 bits) */
/* Packed format is used, when possible, to avoid wasting RAM on the L2P table. */
struct ftl_addr {
union {
struct {
uint64_t cache_offset : 63;
uint64_t cached : 1;
};
struct {
union {
struct {
uint32_t cache_offset : 31;
uint32_t cached : 1;
};
uint32_t offset;
};
uint32_t rsvd;
} pack;
uint64_t offset;
};
};
#endif /* FTL_ADDR_H */
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