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/*
Copyright (c) 2016, Antonio SJ Musumeci <trapexit@spawn.link>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <string>
#include <vector>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include "config.hpp"
#include "fs_path.hpp"
#include "rwlock.hpp"
#include "ugid.hpp"
using std::string;
using std::vector;
using mergerfs::Policy;
using mergerfs::Category;
static
int
_access(Policy::Func::Search searchFunc,
const vector<string> &srcmounts,
const uint64_t minfreespace,
const char *fusepath,
const int mask)
{
int rv;
string fullpath;
vector<const string*> basepaths;
rv = searchFunc(srcmounts,fusepath,minfreespace,basepaths);
if(rv == -1)
return -errno;
fs::path::make(basepaths[0],fusepath,fullpath);
rv = ::faccessat(AT_FDCWD,fullpath.c_str(),mask,AT_EACCESS);
return ((rv == -1) ? -errno : 0);
}
namespace mergerfs
{
namespace fuse
{
int
access(const char *fusepath,
int mask)
{
const fuse_context *fc = fuse_get_context();
const Config &config = Config::get(fc);
const ugid::Set ugid(fc->uid,fc->gid);
const rwlock::ReadGuard readlock(&config.srcmountslock);
return _access(config.access,
config.srcmounts,
config.minfreespace,
fusepath,
mask);
}
}
}