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132 lines
3.6 KiB
132 lines
3.6 KiB
/*
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The MIT License (MIT)
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Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#include <fuse.h>
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#include <string>
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#include <vector>
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#include <sys/types.h>
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#include <errno.h>
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#include <string.h>
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#include "buildvector.hpp"
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#include "category.hpp"
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#include "config.hpp"
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#include "fs_path.hpp"
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#include "rwlock.hpp"
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#include "ugid.hpp"
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#include "xattr.hpp"
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using std::string;
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using std::vector;
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using namespace mergerfs;
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static
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int
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_listxattr_controlfile(char *list,
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const size_t size)
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{
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string xattrs;
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const vector<string> strs =
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buildvector<string>
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("user.mergerfs.srcmounts")
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("user.mergerfs.minfreespace")
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("user.mergerfs.moveonenospc")
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("user.mergerfs.policies")
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("user.mergerfs.version");
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xattrs.reserve(1024);
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for(size_t i = 0; i < strs.size(); i++)
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xattrs += (strs[i] + '\0');
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for(size_t i = Category::Enum::BEGIN; i < Category::Enum::END; i++)
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xattrs += ("user.mergerfs.category." + (std::string)*Category::categories[i] + '\0');
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for(size_t i = FuseFunc::Enum::BEGIN; i < FuseFunc::Enum::END; i++)
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xattrs += ("user.mergerfs.func." + (std::string)*FuseFunc::fusefuncs[i] + '\0');
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if(size == 0)
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return xattrs.size();
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if(size < xattrs.size())
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return -ERANGE;
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memcpy(list,xattrs.c_str(),xattrs.size());
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return xattrs.size();
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}
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static
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int
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_listxattr(Policy::Func::Search searchFunc,
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const vector<string> &srcmounts,
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const size_t minfreespace,
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const string &fusepath,
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char *list,
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const size_t size)
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{
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#ifndef WITHOUT_XATTR
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int rv;
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vector<string> path;
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rv = searchFunc(srcmounts,fusepath,minfreespace,path);
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if(rv == -1)
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return -errno;
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fs::path::append(path[0],fusepath);
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rv = ::llistxattr(path[0].c_str(),list,size);
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return ((rv == -1) ? -errno : rv);
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#else
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return -ENOTSUP;
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#endif
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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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listxattr(const char *fusepath,
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char *list,
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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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if(fusepath == config.controlfile)
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return _listxattr_controlfile(list,size);
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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 _listxattr(config.listxattr,
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config.srcmounts,
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config.minfreespace,
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fusepath,
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list,
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size);
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}
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}
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}
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