mirror of https://github.com/trapexit/mergerfs.git
144 lines
2.8 KiB
C++
144 lines
2.8 KiB
C++
/*
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ISC License
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Copyright (c) 2016, 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 "fs_statvfs.hpp"
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#include "statvfs_util.hpp"
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#include <cstdint>
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#include <map>
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#include <string>
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#include <pthread.h>
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#include <sys/statvfs.h>
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#include <time.h>
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struct Element
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{
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uint64_t time;
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struct statvfs st;
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};
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typedef std::map<std::string,Element> statvfs_cache;
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static uint64_t g_timeout = 0;
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static statvfs_cache g_cache;
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static pthread_mutex_t g_cache_lock = PTHREAD_MUTEX_INITIALIZER;
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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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namespace fs
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{
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uint64_t
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statvfs_cache_timeout(void)
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{
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return g_timeout;
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}
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void
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statvfs_cache_timeout(const uint64_t timeout_)
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{
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g_timeout = timeout_;
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}
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int
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statvfs_cache(const char *path_,
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struct statvfs *st_)
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{
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int rv;
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Element *e;
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uint64_t now;
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if(g_timeout == 0)
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return fs::statvfs(path_,st_);
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rv = 0;
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now = l::get_time();
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pthread_mutex_lock(&g_cache_lock);
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e = &g_cache[path_];
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if((now - e->time) > g_timeout)
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{
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e->time = now;
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rv = fs::statvfs(path_,&e->st);
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}
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*st_ = e->st;
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pthread_mutex_unlock(&g_cache_lock);
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return rv;
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}
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int
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statvfs_cache_readonly(const std::string &path_,
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bool *readonly_)
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{
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int rv;
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struct statvfs st;
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rv = fs::statvfs_cache(path_.c_str(),&st);
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if(rv == 0)
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*readonly_ = StatVFS::readonly(st);
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return rv;
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}
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int
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statvfs_cache_spaceavail(const std::string &path_,
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uint64_t *spaceavail_)
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{
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int rv;
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struct statvfs st;
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rv = fs::statvfs_cache(path_.c_str(),&st);
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if(rv == 0)
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*spaceavail_ = StatVFS::spaceavail(st);
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return rv;
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}
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int
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statvfs_cache_spaceused(const std::string &path_,
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uint64_t *spaceused_)
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{
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int rv;
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struct statvfs st;
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rv = fs::statvfs_cache(path_.c_str(),&st);
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if(rv == 0)
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*spaceused_ = StatVFS::spaceused(st);
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return rv;
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}
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}
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