mirror of
https://github.com/trapexit/mergerfs.git
synced 2026-10-26 19:01:56 -04:00
0c17492c78
Previously most FUSE ops took a reference to the live cfg.branches object. With atomic_load now producing a shared_ptr snapshot, pass it by value: the op works against a single stable view of the configuration for its whole lifetime, immune to concurrent reconfiguration. Also bail out with -ENOENT when the policy returns an empty branch set rather than dereferencing branches[0]. This was reachable if a policy rejected every branch (e.g. everything readonly while looking for a writable target). Covers access, chmod, chown, create, getattr, getxattr, ioctl, link, listxattr, mkdir, mknod, open, readdir (cor/cosr), readlink, removexattr, rename, rmdir, setxattr, statfs, statx, symlink, truncate, unlink, utimens. While here, in _getattr only dereference st_->st_mode when lstat succeeded (it is otherwise uninitialized).
118 lines
2.8 KiB
C++
118 lines
2.8 KiB
C++
/*
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ISC License
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Copyright (c) 2026, 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_chmod.hpp"
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#include "config.hpp"
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#include "errno.hpp"
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#include "fs_lchmod.hpp"
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#include "fs_path.hpp"
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#include "policy_rv.hpp"
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#include "fuse.h"
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#include <cstring>
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#include <string>
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static
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void
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_chmod_loop_core(const std::string &basepath_,
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const fs::path &fusepath_,
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const mode_t mode_,
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PolicyRV *prv_)
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{
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int rv;
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fs::path fullpath;
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fullpath = basepath_ / fusepath_;
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rv = fs::lchmod(fullpath,mode_);
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prv_->insert(rv,basepath_);
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}
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static
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void
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_chmod_loop(const std::vector<Branch*> &branches_,
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const fs::path &fusepath_,
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const mode_t mode_,
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PolicyRV *prv_)
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{
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for(auto &branch : branches_)
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{
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::_chmod_loop_core(branch->path,fusepath_,mode_,prv_);
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}
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}
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static
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int
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_chmod(const Policy::Action &actionFunc_,
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const Policy::Search &searchFunc_,
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const Branches::Ptr branches_,
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const fs::path &fusepath_,
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const mode_t mode_)
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{
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int rv;
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PolicyRV prv;
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std::vector<Branch*> branches;
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rv = actionFunc_(branches_,fusepath_,branches);
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if(rv < 0)
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return rv;
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if(branches.empty())
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return -ENOENT;
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::_chmod_loop(branches,fusepath_,mode_,&prv);
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if(prv.errors.empty())
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return 0;
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if(prv.successes.empty())
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return prv.errors[0].rv;
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branches.clear();
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rv = searchFunc_(branches_,fusepath_,branches);
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if(rv < 0)
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return rv;
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if(branches.empty())
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return -ENOENT;
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return prv.get_error(branches[0]->path);
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}
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static
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int
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_chmod(const fs::path &fusepath_,
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const mode_t mode_)
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{
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return ::_chmod(cfg.func.chmod.policy,
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cfg.func.getattr.policy,
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cfg.branches,
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fusepath_,
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mode_);
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}
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int
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FUSE::chmod(const fuse_req_ctx_t *ctx_,
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const char *fusepath_,
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mode_t mode_)
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{
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const fs::path fusepath{fusepath_};
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return ::_chmod(fusepath,mode_);
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}
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