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101 lines
2.6 KiB
C++
101 lines
2.6 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <AK/StringView.h>
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#include <Kernel/FileSystem/InodeIdentifier.h>
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#include <Kernel/Forward.h>
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#include <Kernel/KResult.h>
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#include <Kernel/Mutex.h>
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#include <Kernel/UnixTypes.h>
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#include <Kernel/UserOrKernelBuffer.h>
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namespace Kernel {
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static constexpr u32 mepoch = 476763780;
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class FileSystem : public RefCounted<FileSystem> {
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friend class Inode;
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public:
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virtual ~FileSystem();
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unsigned fsid() const { return m_fsid; }
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static FileSystem* from_fsid(u32);
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static void sync();
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static void lock_all();
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virtual bool initialize() = 0;
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virtual StringView class_name() const = 0;
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virtual NonnullRefPtr<Inode> root_inode() const = 0;
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virtual bool supports_watchers() const { return false; }
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bool is_readonly() const { return m_readonly; }
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virtual unsigned total_block_count() const { return 0; }
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virtual unsigned free_block_count() const { return 0; }
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virtual unsigned total_inode_count() const { return 0; }
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virtual unsigned free_inode_count() const { return 0; }
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virtual KResult prepare_to_unmount() const { return KSuccess; }
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struct DirectoryEntryView {
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DirectoryEntryView(const StringView& name, InodeIdentifier, u8 file_type);
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StringView name;
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InodeIdentifier inode;
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u8 file_type { 0 };
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};
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virtual void flush_writes() { }
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u64 block_size() const { return m_block_size; }
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size_t fragment_size() const { return m_fragment_size; }
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virtual bool is_file_backed() const { return false; }
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// Converts file types that are used internally by the filesystem to DT_* types
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virtual u8 internal_file_type_to_directory_entry_type(const DirectoryEntryView& entry) const { return entry.file_type; }
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protected:
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FileSystem();
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void set_block_size(u64 size) { m_block_size = size; }
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void set_fragment_size(size_t size) { m_fragment_size = size; }
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mutable Mutex m_lock { "FS" };
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private:
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unsigned m_fsid { 0 };
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u64 m_block_size { 0 };
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size_t m_fragment_size { 0 };
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bool m_readonly { false };
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};
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inline FileSystem* InodeIdentifier::fs()
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{
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return FileSystem::from_fsid(m_fsid);
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}
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inline const FileSystem* InodeIdentifier::fs() const
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{
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return FileSystem::from_fsid(m_fsid);
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}
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}
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namespace AK {
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template<>
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struct Traits<Kernel::InodeIdentifier> : public GenericTraits<Kernel::InodeIdentifier> {
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static unsigned hash(const Kernel::InodeIdentifier& inode) { return pair_int_hash(inode.fsid(), inode.index().value()); }
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};
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}
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