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139 lines
3.5 KiB
139 lines
3.5 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 <string.h>
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#include "config.hpp"
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#include "errno.hpp"
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#include "fs_base_readlink.hpp"
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#include "fs_base_stat.hpp"
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#include "fs_path.hpp"
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#include "rwlock.hpp"
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#include "symlinkify.hpp"
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#include "ugid.hpp"
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using std::string;
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using std::vector;
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using mergerfs::Policy;
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static
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int
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_readlink_core_standard(const string &fullpath,
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char *buf,
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const size_t size)
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{
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int rv;
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rv = fs::readlink(fullpath,buf,size);
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if(rv == -1)
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return -errno;
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buf[rv] = '\0';
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return 0;
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}
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static
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int
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_readlink_core_symlinkify(const string &fullpath,
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char *buf,
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const size_t size,
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const time_t symlinkify_timeout)
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{
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int rv;
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struct stat st;
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rv = fs::stat(fullpath,st);
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if(rv == -1)
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return -errno;
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if(!symlinkify::can_be_symlink(st,symlinkify_timeout))
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return _readlink_core_standard(fullpath,buf,size);
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strncpy(buf,fullpath.c_str(),size);
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return 0;
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}
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static
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int
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_readlink_core(const string *basepath,
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const char *fusepath,
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char *buf,
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const size_t size,
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const bool symlinkify,
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const time_t symlinkify_timeout)
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{
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string fullpath;
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fs::path::make(basepath,fusepath,fullpath);
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if(symlinkify)
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return _readlink_core_symlinkify(fullpath,buf,size,symlinkify_timeout);
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return _readlink_core_standard(fullpath,buf,size);
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}
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static
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int
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_readlink(Policy::Func::Search searchFunc,
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const Branches &branches_,
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const uint64_t minfreespace,
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const char *fusepath,
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char *buf,
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const size_t size,
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const bool symlinkify,
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const time_t symlinkify_timeout)
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{
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int rv;
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vector<const string*> basepaths;
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rv = searchFunc(branches_,fusepath,minfreespace,basepaths);
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if(rv == -1)
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return -errno;
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return _readlink_core(basepaths[0],fusepath,buf,size,
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symlinkify,symlinkify_timeout);
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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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readlink(const char *fusepath,
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char *buf,
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size_t size)
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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.branches_lock);
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return _readlink(config.readlink,
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config.branches,
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config.minfreespace,
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fusepath,
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buf,
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size,
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config.symlinkify,
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config.symlinkify_timeout);
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}
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}
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}
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