mirror of
https://github.com/trapexit/mergerfs.git
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0dcca0f1a3
Branches using the default minfreespace held a reference to their owning Impl's _default_minfreespace. After a copy or move the pointer still referenced the source Impl, which could become invalid or diverge after further configuration changes. Switch to a pointer and re-link it to the destination Impl on copy/move. While here, convert set_branch_mode to do an atomic_store of a newly constructed Impl rather than mutating the shared pointer target in place. Readers holding an atomic_load snapshot are no longer affected by a concurrent mode change.
103 lines
2.4 KiB
C++
103 lines
2.4 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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#pragma once
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#include "branch.hpp"
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#include "fs_path.hpp"
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#include "strvec.hpp"
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#include "tofrom_string.hpp"
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#include <atomic>
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#include <cstdint>
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#include <memory>
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#include <string>
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#include <vector>
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#define MINFREESPACE_DEFAULT (4294967295ULL)
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class Branches final : public ToFromString
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{
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public:
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class Impl final : public ToFromString,
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public std::vector<Branch>
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{
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private:
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const u64 *_default_minfreespace;
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public:
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using Ptr = std::shared_ptr<Impl>;
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public:
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Impl(const u64 *default_minfreespace);
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public:
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int from_string(const std::string_view str) final;
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std::string to_string(void) const final;
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public:
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const u64 &minfreespace(void) const;
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void to_paths(StrVec &strvec) const;
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std::vector<fs::path> to_paths() const;
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public:
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Impl& operator=(Impl &impl_);
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Impl& operator=(Impl &&impl_);
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};
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public:
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using Ptr = Branches::Impl::Ptr;
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public:
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u64 minfreespace = MINFREESPACE_DEFAULT;
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private:
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mutable std::shared_ptr<Impl> _impl;
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public:
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Branches()
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: _impl(std::make_shared<Impl>(&minfreespace))
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{
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}
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public:
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int from_string(const std::string_view str) final;
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std::string to_string(void) const final;
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public:
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operator Ptr() const { return std::atomic_load(&_impl); }
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Ptr operator->() const { return std::atomic_load(&_impl); }
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public:
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void find_and_set_mode_ro();
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};
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class SrcMounts : public ToFromString
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{
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public:
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SrcMounts(Branches &b);
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public:
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int from_string(const std::string_view str) final;
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std::string to_string(void) const final;
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private:
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Branches &_branches;
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};
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