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https://github.com/LadybirdBrowser/ladybird.git
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30861daa93
Before this change, we had File::mmap() which did all the work of setting up a VMObject, and then creating a Region in the current process's address space. This patch simplifies the interface by removing the region part. Files now only have to return a suitable VMObject from vmobject_for_mmap(), and then sys$mmap() itself will take care of actually mapping it into the address space. This fixes an issue where we'd try to block on I/O (for inode metadata lookup) while holding the address space spinlock. It also reduces time spent holding the address space lock.
57 lines
2.0 KiB
C++
57 lines
2.0 KiB
C++
/*
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* Copyright (c) 2018-2022, 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 <Kernel/FileSystem/File.h>
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namespace Kernel {
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class Inode;
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class InodeFile final : public File {
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public:
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static ErrorOr<NonnullLockRefPtr<InodeFile>> create(NonnullLockRefPtr<Inode>&& inode)
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{
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auto file = adopt_lock_ref_if_nonnull(new (nothrow) InodeFile(move(inode)));
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if (!file)
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return ENOMEM;
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return file.release_nonnull();
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}
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virtual ~InodeFile() override;
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Inode const& inode() const { return *m_inode; }
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Inode& inode() { return *m_inode; }
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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;
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virtual ErrorOr<size_t> write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t) override;
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virtual ErrorOr<void> ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) override;
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virtual ErrorOr<NonnullLockRefPtr<Memory::VMObject>> vmobject_for_mmap(Process&, Memory::VirtualRange const&, u64& offset, bool shared) override;
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virtual ErrorOr<struct stat> stat() const override { return inode().metadata().stat(); }
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virtual ErrorOr<NonnullOwnPtr<KString>> pseudo_path(OpenFileDescription const&) const override;
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virtual ErrorOr<void> truncate(u64) override;
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virtual ErrorOr<void> sync() override;
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virtual ErrorOr<void> chown(Credentials const&, OpenFileDescription&, UserID, GroupID) override;
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virtual ErrorOr<void> chmod(Credentials const&, OpenFileDescription&, mode_t) override;
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virtual StringView class_name() const override { return "InodeFile"sv; }
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virtual bool is_seekable() const override { return true; }
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virtual bool is_inode() const override { return true; }
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private:
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explicit InodeFile(NonnullLockRefPtr<Inode>&&);
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NonnullLockRefPtr<Inode> m_inode;
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};
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}
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