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145 lines
3.9 KiB
145 lines
3.9 KiB
/*
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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 <fuse.h>
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#include <sys/statvfs.h>
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#include <algorithm>
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#include <climits>
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#include <map>
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#include <string>
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#include <vector>
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#include "config.hpp"
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#include "errno.hpp"
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#include "rwlock.hpp"
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#include "success_fail.hpp"
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#include "ugid.hpp"
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using std::string;
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using std::map;
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using std::vector;
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static
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void
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_normalize_statvfs(struct statvfs *fsstat,
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const unsigned long min_bsize,
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const unsigned long min_frsize,
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const unsigned long min_namemax)
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{
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fsstat->f_blocks = (fsblkcnt_t)((fsstat->f_blocks * fsstat->f_frsize) / min_frsize);
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fsstat->f_bfree = (fsblkcnt_t)((fsstat->f_bfree * fsstat->f_frsize) / min_frsize);
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fsstat->f_bavail = (fsblkcnt_t)((fsstat->f_bavail * fsstat->f_frsize) / min_frsize);
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fsstat->f_bsize = min_bsize;
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fsstat->f_frsize = min_frsize;
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fsstat->f_namemax = min_namemax;
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}
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static
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void
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_merge_statvfs(struct statvfs * const out,
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const struct statvfs * const in)
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{
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out->f_blocks += in->f_blocks;
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out->f_bfree += in->f_bfree;
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out->f_bavail += in->f_bavail;
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out->f_files += in->f_files;
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out->f_ffree += in->f_ffree;
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out->f_favail += in->f_favail;
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}
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static
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void
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_statfs_core(const char *srcmount,
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unsigned long &min_bsize,
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unsigned long &min_frsize,
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unsigned long &min_namemax,
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map<dev_t,struct statvfs> &fsstats)
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{
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int rv;
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struct stat st;
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struct statvfs fsstat;
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rv = ::statvfs(srcmount,&fsstat);
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if(STATVFS_FAILED(rv))
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return;
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rv = ::stat(srcmount,&st);
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if(STAT_FAILED(rv))
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return;
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if(min_bsize > fsstat.f_bsize)
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min_bsize = fsstat.f_bsize;
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if(min_frsize > fsstat.f_frsize)
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min_frsize = fsstat.f_frsize;
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if(min_namemax > fsstat.f_namemax)
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min_namemax = fsstat.f_namemax;
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fsstats.insert(std::make_pair(st.st_dev,fsstat));
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}
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static
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int
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_statfs(const vector<string> &srcmounts,
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struct statvfs &fsstat)
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{
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map<dev_t,struct statvfs> fsstats;
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unsigned long min_bsize = ULONG_MAX;
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unsigned long min_frsize = ULONG_MAX;
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unsigned long min_namemax = ULONG_MAX;
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for(size_t i = 0, ei = srcmounts.size(); i < ei; i++)
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{
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_statfs_core(srcmounts[i].c_str(),min_bsize,min_frsize,min_namemax,fsstats);
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}
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map<dev_t,struct statvfs>::iterator iter = fsstats.begin();
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map<dev_t,struct statvfs>::iterator enditer = fsstats.end();
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if(iter != enditer)
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{
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fsstat = iter->second;
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_normalize_statvfs(&fsstat,min_bsize,min_frsize,min_namemax);
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for(++iter; iter != enditer; ++iter)
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{
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_normalize_statvfs(&iter->second,min_bsize,min_frsize,min_namemax);
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_merge_statvfs(&fsstat,&iter->second);
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}
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}
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return 0;
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}
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namespace mergerfs
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{
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namespace fuse
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{
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int
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statfs(const char *fusepath,
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struct statvfs *stat)
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{
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const fuse_context *fc = fuse_get_context();
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const Config &config = Config::get(fc);
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const ugid::Set ugid(fc->uid,fc->gid);
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const rwlock::ReadGuard readlock(&config.srcmountslock);
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return _statfs(config.srcmounts,
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*stat);
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}
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}
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}
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