91 lines
2.6 KiB
C++
91 lines
2.6 KiB
C++
// Copyright (c) Vitaliy Filippov, 2019+
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// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
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#pragma once
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#include <stdint.h>
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#include <functional>
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#define POOL_SCHEME_REPLICATED 1
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#define POOL_SCHEME_XOR 2
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#define POOL_SCHEME_EC 3
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#define POOL_ID_MAX 0x10000
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#define POOL_ID_BITS 16
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#define INODE_POOL(inode) (pool_id_t)((inode) >> (64 - POOL_ID_BITS))
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#define INODE_NO_POOL(inode) (inode_t)((inode) & (((uint64_t)1 << (64-POOL_ID_BITS)) - 1))
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#define INODE_WITH_POOL(pool_id, inode) (((inode_t)(pool_id) << (64-POOL_ID_BITS)) | INODE_NO_POOL(inode))
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typedef uint64_t inode_t;
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// Pool ID is 16 bits long
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typedef uint32_t pool_id_t;
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// 16 bytes per object/stripe id
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// stripe = (start of the parity stripe + peer role)
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// i.e. for example (256KB + one of 0,1,2)
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struct __attribute__((__packed__)) object_id
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{
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inode_t inode;
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uint64_t stripe;
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};
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inline bool operator == (const object_id & a, const object_id & b)
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{
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return a.inode == b.inode && a.stripe == b.stripe;
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}
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inline bool operator != (const object_id & a, const object_id & b)
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{
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return a.inode != b.inode || a.stripe != b.stripe;
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}
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inline bool operator < (const object_id & a, const object_id & b)
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{
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return a.inode < b.inode || a.inode == b.inode && a.stripe < b.stripe;
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}
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// 56 = 24 + 32 bytes per dirty entry in memory (obj_ver_id => dirty_entry)
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struct __attribute__((__packed__)) obj_ver_id
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{
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object_id oid;
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uint64_t version;
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};
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inline bool operator == (const obj_ver_id & a, const obj_ver_id & b)
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{
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return a.oid == b.oid && a.version == b.version;
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}
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inline bool operator < (const obj_ver_id & a, const obj_ver_id & b)
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{
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return a.oid < b.oid || a.oid == b.oid && a.version < b.version;
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}
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namespace std
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{
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template<> struct hash<object_id>
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{
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inline size_t operator()(const object_id &s) const
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{
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size_t seed = 0;
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// Copy-pasted from spp::hash_combine()
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seed ^= (s.inode + 0xc6a4a7935bd1e995 + (seed << 6) + (seed >> 2));
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seed ^= (s.stripe + 0xc6a4a7935bd1e995 + (seed << 6) + (seed >> 2));
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return seed;
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}
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};
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template<> struct hash<obj_ver_id>
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{
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inline size_t operator()(const obj_ver_id &s) const
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{
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size_t seed = 0;
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// Copy-pasted from spp::hash_combine()
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seed ^= (s.oid.inode + 0xc6a4a7935bd1e995 + (seed << 6) + (seed >> 2));
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seed ^= (s.oid.stripe + 0xc6a4a7935bd1e995 + (seed << 6) + (seed >> 2));
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seed ^= (s.version + 0xc6a4a7935bd1e995 + (seed << 6) + (seed >> 2));
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return seed;
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}
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};
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}
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