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https://github.com/SerenityOS/serenity
synced 2026-05-09 00:22:43 +02:00
f6db24dba4
That functionality seems to be too much complicated. We shouldn't overengineer how the copy_mount syscall works, so instead of allowing replacement of the root filesystem, let's make the unshare file descriptor to be configured via a special ioctl call before we initialize a new VFSRootContext object. The special ioctl can either set a new root filesystem for the upcoming VFSRootContext object, or remove it (by passing fd of -1). If there's no specified root filesystem, a new RAMFS instance will be created automatically when invoking the unshare_create syscall. This also simplifies the code in the boot process, hence making it much more readable. It should be noted, that we assumed during pivot_root that the first mountpoint in a context is the root mountpoint, which is probably a fair assumption, but we don't assume this anywhere else in the VFSRootContext code. If this functionality ever comes back, we should ensure that we make some effort to not assume this again.
40 lines
1.4 KiB
C++
40 lines
1.4 KiB
C++
/*
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* Copyright (c) 2026, Liav A. <liavalb@hotmail.co.il>
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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 <Kernel/API/Unshare.h>
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#include <Kernel/FileSystem/File.h>
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#include <Kernel/Locking/MutexProtected.h>
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namespace Kernel {
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class UnsharedResourceFile final : public File {
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public:
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static ErrorOr<NonnullRefPtr<UnsharedResourceFile>> create(UnshareType);
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virtual ~UnsharedResourceFile() override;
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virtual bool can_read(OpenFileDescription const&, u64) const override { return true; }
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virtual bool can_write(OpenFileDescription const&, u64) const override { return true; }
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virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override { return ENOTSUP; }
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virtual ErrorOr<size_t> write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t) override { return ENOTSUP; }
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virtual ErrorOr<void> ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) override;
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virtual ErrorOr<NonnullOwnPtr<KString>> pseudo_path(OpenFileDescription const&) const override;
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virtual StringView class_name() const override { return "UnsharedResourceFile"sv; }
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ErrorOr<unsigned> initialize_resource();
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private:
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virtual bool is_unshared_resource_file() const override { return true; }
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explicit UnsharedResourceFile(UnshareType);
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UnshareType const m_type;
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MutexProtected<RefPtr<FileSystem>> m_root_filesystem;
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};
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}
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