[ceph.git] / ceph / src / spdk / lib / ftl / ftl_addr.h

/*-
 *   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 */
Commit	Line	Data
7c673cae FG	1	/*-
	2	* BSD LICENSE
	3	*
7c673cae FG	4	* Copyright (c) Intel Corporation.
	5	* All rights reserved.
	6	*
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions
	9	* are met:
	10	*
	11	* * Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* * Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in
	15	* the documentation and/or other materials provided with the
	16	* distribution.
	17	* * Neither the name of Intel Corporation nor the names of its
	18	* contributors may be used to endorse or promote products derived
	19	* from this software without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	22	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	23	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	24	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	25	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	26	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	27	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	28	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	29	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	30	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	31	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	32	*/
	33
f67539c2 TL	34	#ifndef FTL_ADDR_H
f67539c2 TL	35	#define FTL_ADDR_H
9f95a23c	36
11fdf7f2	37	#include "spdk/stdinc.h"
7c673cae	38
f67539c2 TL	39	/* Marks address as invalid */
f67539c2 TL	40	#define FTL_ADDR_INVALID (-1)
9f95a23c TL	41	/* Marks LBA as invalid */
	42	#define FTL_LBA_INVALID ((uint64_t)-1)
	43	/* Smallest data unit size */
	44	#define FTL_BLOCK_SIZE 4096
	45
f67539c2	46	/* This structure represents on-disk address. It can have one of the following */
9f95a23c	47	/* formats: */
f67539c2 TL	48	/* - offset inside the disk */
f67539c2 TL	49	/* - cache_offset inside the cache (indicated by the cached flag) */
9f95a23c	50	/* - packed version of the two formats above (can be only used when the */
f67539c2	51	/* offset can be represented in less than 32 bits) */
9f95a23c	52	/* Packed format is used, when possible, to avoid wasting RAM on the L2P table. */
f67539c2	53	struct ftl_addr {
9f95a23c TL	54	union {
9f95a23c TL	55	struct {
f67539c2 TL	56	uint64_t cache_offset : 63;
f67539c2 TL	57	uint64_t cached : 1;
9f95a23c TL	58	};
	59
	60	struct {
	61	union {
	62	struct {
f67539c2 TL	63	uint32_t cache_offset : 31;
f67539c2 TL	64	uint32_t cached : 1;
9f95a23c	65	};
7c673cae	66
f67539c2	67	uint32_t offset;
9f95a23c TL	68	};
	69	uint32_t rsvd;
	70	} pack;
7c673cae	71
f67539c2	72	uint64_t offset;
9f95a23c TL	73	};
9f95a23c TL	74	};
7c673cae	75
f67539c2	76	#endif /* FTL_ADDR_H */