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https://github.com/trapexit/mergerfs.git
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2b500f194a
Also have special error handling for when branches are invalid and ENOENT would be returned for getattr and readdir so users understand what is going on and the runtime interface can still be used to fix the problem.
149 lines
3.4 KiB
C++
149 lines
3.4 KiB
C++
/*
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Copyright (c) 2018, 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_listxattr.hpp"
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#include "config.hpp"
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#include "errno.hpp"
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#include "fs_llistxattr.hpp"
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#include "ugid.hpp"
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#include "xattr.hpp"
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#include "fuse.h"
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#include <optional>
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#include <string>
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#include <cstring>
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static
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ssize_t
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_listxattr_size(const std::vector<Branch*> &branches_,
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const char *fusepath_)
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{
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ssize_t rv;
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ssize_t size;
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std::string fullpath;
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size = 0;
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for(const auto branch : branches_)
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{
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fullpath = fs::path::make(branch->path,fusepath_);
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rv = fs::llistxattr(fullpath,NULL,0);
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if(rv < 0)
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continue;
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size += rv;
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}
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return rv;
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}
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static
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ssize_t
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_listxattr(const std::vector<Branch*> &branches_,
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const char *fusepath_,
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char *list_,
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size_t size_)
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{
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ssize_t rv;
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ssize_t size;
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std::string fullpath;
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std::optional<ssize_t> err;
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if(size_ == 0)
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return ::_listxattr_size(branches_,fusepath_);
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size = 0;
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err = -ENOENT;
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for(const auto branch : branches_)
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{
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fullpath = fs::path::make(branch->path,fusepath_);
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rv = fs::llistxattr(fullpath,list_,size_);
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if(rv == -ERANGE)
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return -ERANGE;
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if(rv < 0)
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{
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if(!err.has_value())
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err = rv;
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continue;
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}
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err = 0;
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list_ += rv;
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size_ -= rv;
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size += rv;
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}
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if(err < 0)
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return err.value();
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return size;
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}
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static
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int
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_listxattr(const Policy::Search &searchFunc_,
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const Branches &ibranches_,
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const char *fusepath_,
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char *list_,
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const size_t size_)
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{
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int rv;
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std::string fullpath;
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std::vector<Branch*> obranches;
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rv = searchFunc_(ibranches_,fusepath_,obranches);
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if(rv == -1)
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return -errno;
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if(size_ == 0)
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return ::_listxattr_size(obranches,fusepath_);
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return ::_listxattr(obranches,fusepath_,list_,size_);
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}
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int
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FUSE::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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Config::Read cfg;
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if(Config::is_ctrl_file(fusepath_))
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return cfg->keys_listxattr(list_,size_);
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switch(cfg->xattr)
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{
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case XAttr::ENUM::PASSTHROUGH:
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break;
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case XAttr::ENUM::NOATTR:
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return 0;
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case XAttr::ENUM::NOSYS:
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return -ENOSYS;
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}
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const fuse_context *fc = fuse_get_context();
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const ugid::Set ugid(fc->uid,fc->gid);
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return ::_listxattr(cfg->func.listxattr.policy,
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cfg->branches,
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fusepath_,
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list_,
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size_);
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}
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