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Kernel/FileSystem: Add the DevLoopFS filesystem

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Similarly to DevPtsFS, this filesystem is about exposing loop device
nodes easily in /dev/loop, so userspace doesn't need to do anything in
order to use new devices immediately.
This commit is contained in:
Liav A 2024-02-09 15:30:09 +02:00 • committed by Andrew Kaster
parent 11ead5c84f
commit 0d2e4a7e67
6 changed files with 292 additions and 0 deletions
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49
Kernel/FileSystem/DevLoopFS/Inode.h Normal file
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/*
* Copyright (c) 2024, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Types.h>
#include <Kernel/Devices/Loop/LoopDevice.h>
#include <Kernel/FileSystem/DevLoopFS/FileSystem.h>
#include <Kernel/FileSystem/Inode.h>
namespace Kernel {
class DevLoopFSInode final : public Inode {
friend class DevLoopFS;
public:
virtual ~DevLoopFSInode() override;
DevLoopFS& fs() { return static_cast<DevLoopFS&>(Inode::fs()); }
DevLoopFS const& fs() const { return static_cast<DevLoopFS const&>(Inode::fs()); }
private:
DevLoopFSInode(DevLoopFS&, InodeIndex, LoopDevice&);
// NOTE: This constructor is used for the root inode only.
DevLoopFSInode(DevLoopFS&);
// ^Inode
virtual ErrorOr<size_t> read_bytes_locked(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
virtual InodeMetadata metadata() const override;
virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
virtual ErrorOr<void> flush_metadata() override;
virtual ErrorOr<size_t> write_bytes_locked(off_t, size_t, UserOrKernelBuffer const& buffer, OpenFileDescription*) override;
virtual ErrorOr<NonnullRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override;
virtual ErrorOr<void> add_child(Inode&, StringView name, mode_t) override;
virtual ErrorOr<void> remove_child(StringView name) override;
virtual ErrorOr<void> replace_child(StringView name, Inode& child) override;
virtual ErrorOr<void> chmod(mode_t) override;
virtual ErrorOr<void> chown(UserID, GroupID) override;
LockWeakPtr<LoopDevice> m_loop_device;
InodeMetadata m_metadata;
};
}