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/*-
* Copyright (c) 2008-2011 Varnish Software AS
* All rights reserved.
*
* Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
*/
/*
*
* Overall layout:
*
* struct smp_ident; Identification and geometry
* sha256[...] checksum of same
*
* struct smp_sign;
* banspace_1; First ban-space
* sha256[...] checksum of same
*
* struct smp_sign;
* banspace_2; Second ban-space
* sha256[...] checksum of same
*
* struct smp_sign;
* struct smp_segment_1[N]; First Segment table
* sha256[...] checksum of same
*
* struct smp_sign;
* struct smp_segment_2[N]; Second Segment table
* sha256[...] checksum of same
*
* N segments {
* struct smp_sign;
* struct smp_object[M] Objects in segment
* sha256[...] checksum of same
* objspace
* }
*
*/
/*
* The identblock is located in the first sector of the storage space.
* This is written once and not subsequently modified in normal operation.
* It is immediately followed by a SHA256sum of the structure, as stored.
*/
struct smp_ident {
char ident[32]; /* Human readable ident
* so people and programs
* can tell what the file
* or device contains.
*/
uint32_t byte_order; /* 0x12345678 */
uint32_t size; /* sizeof(struct smp_ident) */
uint32_t major_version;
uint32_t unique;
uint32_t align; /* alignment in silo */
uint32_t granularity; /* smallest ... in bytes */
uint64_t mediasize; /* ... in bytes */
uint64_t stuff[6]; /* pointers to stuff */
#define SMP_BAN1_STUFF 0
#define SMP_BAN2_STUFF 1
#define SMP_SEG1_STUFF 2
#define SMP_SEG2_STUFF 3
#define SMP_SPC_STUFF 4
#define SMP_END_STUFF 5
};
/*
* The size of smp_ident should be fixed and constant across all platforms.
* We enforce that with the following #define and an assert in smp_init()
*/
#define SMP_IDENT_SIZE 112
#define SMP_IDENT_STRING "Varnish Persistent Storage Silo"
/*
* This is used to sign various bits on the disk.
*/
struct smp_sign {
char ident[8];
uint32_t unique;
uint64_t mapped;
uint64_t length; /* NB: Must be last */
};
#define SMP_SIGN_SPACE (sizeof(struct smp_sign) + SHA256_LEN)
/*
* A segment pointer.
*/
struct smp_segptr {
uint64_t offset; /* rel to silo */
uint64_t length; /* rel to offset */
uint64_t objlist; /* rel to silo */
uint32_t lobjlist; /* len of objlist */
};
/*
* An object descriptor
*
* A positive ttl is obj.ttl with obj.grace being NAN
* A negative ttl is - (obj.ttl + obj.grace)
*/
struct smp_object {
uint8_t hash[32]; /* really: DIGEST_LEN */
double ttl;
double ban;
uint64_t ptr; /* rel to silo */
};
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