59 lines
1.5 KiB
C++
59 lines
1.5 KiB
C++
#pragma once
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#include <stdint.h>
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// 16 bytes per object/stripe id
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// stripe includes replica number in 4 least significant bits
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struct __attribute__((__packed__)) object_id
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{
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uint64_t inode;
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uint64_t stripe;
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};
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inline uint64_t operator % (const object_id & a, const uint64_t b)
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{
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return ((a.inode % b) * (0x100000000 % b) * (0x100000000 % b) + a.stripe % b) % b;
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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.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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}
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