mirror of https://github.com/trapexit/mergerfs.git
Antonio SJ Musumeci
3 weeks ago
2 changed files with 0 additions and 212 deletions
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/*
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ISC License |
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Copyright (c) 2026, Antonio SJ Musumeci <trapexit@spawn.link> |
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Permission to use, copy, modify, and/or distribute this software for any |
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purpose with or without fee is hereby granted, provided that the above |
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copyright notice and this permission notice appear in all copies. |
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include "policy_cache.hpp"
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#include "mutex.hpp"
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#include <cstdlib>
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#include <map>
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#include <string>
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#include <time.h>
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using std::map; |
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using std::string; |
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static const uint64_t DEFAULT_TIMEOUT = 0; |
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namespace l |
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{ |
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static |
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uint64_t |
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get_time(void) |
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{ |
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uint64_t rv; |
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rv = ::time(NULL); |
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return rv; |
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} |
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} |
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PolicyCache::Value::Value() |
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: time(0), |
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paths() |
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{ |
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} |
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PolicyCache::PolicyCache(void) |
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: timeout(DEFAULT_TIMEOUT) |
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{ |
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mutex_init(&_lock); |
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} |
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void |
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PolicyCache::erase(const char *fusepath_) |
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{ |
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if(timeout == 0) |
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return; |
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mutex_lock(&_lock); |
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_cache.erase(fusepath_); |
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mutex_unlock(&_lock); |
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} |
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void |
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PolicyCache::cleanup(const int prob_) |
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{ |
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uint64_t now; |
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map<string,Value>::iterator i; |
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if(timeout == 0) |
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return; |
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if(rand() % prob_) |
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return; |
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now = l::get_time(); |
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mutex_lock(&_lock); |
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i = _cache.begin(); |
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while(i != _cache.end()) |
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{ |
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if((now - i->second.time) >= timeout) |
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_cache.erase(i++); |
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else |
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++i; |
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} |
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mutex_unlock(&_lock); |
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} |
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void |
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PolicyCache::clear(void) |
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{ |
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mutex_lock(&_lock); |
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_cache.clear(); |
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mutex_unlock(&_lock); |
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} |
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int |
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PolicyCache::operator()(const Policy::Search &policy_, |
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const Branches &branches_, |
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const char *fusepath_, |
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std::vector<Branch*> &paths_) |
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{ |
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int rv; |
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Value *v; |
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uint64_t now; |
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if(timeout == 0) |
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return policy_(branches_,fusepath_,paths_); |
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now = l::get_time(); |
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mutex_lock(&_lock); |
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v = &_cache[fusepath_]; |
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if((now - v->time) >= timeout) |
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{ |
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mutex_unlock(&_lock); |
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rv = policy_(branches_,fusepath_,paths_); |
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if(rv == -1) |
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return -1; |
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mutex_lock(&_lock); |
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v->time = now; |
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v->paths = paths_; |
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} |
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else |
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{ |
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paths_ = v->paths; |
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} |
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mutex_unlock(&_lock); |
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return 0; |
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} |
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@ -1,61 +0,0 @@ |
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/*
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ISC License |
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Copyright (c) 2026, Antonio SJ Musumeci <trapexit@spawn.link> |
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|
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Permission to use, copy, modify, and/or distribute this software for any |
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purpose with or without fee is hereby granted, provided that the above |
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copyright notice and this permission notice appear in all copies. |
|
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|
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
|
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
|
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
|
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
|
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#pragma once
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#include "policy.hpp"
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#include <cstdint>
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#include <string>
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#include <map>
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#include <pthread.h>
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class PolicyCache |
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{ |
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public: |
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struct Value |
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{ |
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Value(); |
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uint64_t time; |
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std::vector<Branch*> paths; |
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}; |
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public: |
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PolicyCache(void); |
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public: |
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void erase(const char *fusepath); |
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void cleanup(const int prob = 1); |
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void clear(void); |
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public: |
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int operator()(const Policy::Search &policy, |
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const Branches &branches, |
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const char *fusepath, |
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std::vector<Branch*> &paths); |
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public: |
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uint64_t timeout; |
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private: |
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pthread_mutex_t _lock; |
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std::map<std::string,Value> _cache; |
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}; |
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