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130 lines
4.0 KiB
C++
130 lines
4.0 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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/String.h>
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#include <Kernel/FileSystem/InodeIdentifier.h>
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#include <Kernel/KResult.h>
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#include <Kernel/Lock.h>
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#include <Kernel/UnixTypes.h>
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namespace Kernel {
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static const u32 mepoch = 476763780;
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class Inode;
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class FileDescription;
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class LocalSocket;
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class VMObject;
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class FS : public RefCounted<FS> {
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friend class Inode;
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public:
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virtual ~FS();
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unsigned fsid() const { return m_fsid; }
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static FS* 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 const char* class_name() const = 0;
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virtual InodeIdentifier 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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// FIXME: This data structure is very clunky and unpleasant. Replace it with something nicer.
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struct DirectoryEntry {
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DirectoryEntry(const char* name, InodeIdentifier, u8 file_type);
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DirectoryEntry(const char* name, size_t name_length, InodeIdentifier, u8 file_type);
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char name[256];
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size_t name_length { 0 };
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InodeIdentifier inode;
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u8 file_type { 0 };
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};
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virtual KResultOr<NonnullRefPtr<Inode>> create_inode(InodeIdentifier parent_id, const String& name, mode_t, off_t size, dev_t, uid_t, gid_t) = 0;
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virtual KResult create_directory(InodeIdentifier parent_inode, const String& name, mode_t, uid_t, gid_t) = 0;
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virtual RefPtr<Inode> get_inode(InodeIdentifier) const = 0;
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virtual void flush_writes() {}
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int block_size() const { return m_block_size; }
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virtual bool is_disk_backed() const { return false; }
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protected:
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FS();
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void set_block_size(int);
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mutable Lock m_lock { "FS" };
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private:
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unsigned m_fsid { 0 };
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int m_block_size { 0 };
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bool m_readonly { false };
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};
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inline FS* InodeIdentifier::fs()
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{
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return FS::from_fsid(m_fsid);
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}
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inline const FS* InodeIdentifier::fs() const
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{
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return FS::from_fsid(m_fsid);
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}
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inline bool InodeIdentifier::is_root_inode() const
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{
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return (*this) == fs()->root_inode();
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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()); }
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};
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}
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