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https://github.com/SerenityOS/serenity
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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.
54 lines
1.1 KiB
C++
54 lines
1.1 KiB
C++
/*
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* Copyright (c) 2018-2020, 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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#include <AK/StringView.h>
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#include <AK/Userspace.h>
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#include <Kernel/FileSystem/File.h>
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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File::File() = default;
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File::~File() = default;
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ErrorOr<NonnullLockRefPtr<OpenFileDescription>> File::open(int options)
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{
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auto description = OpenFileDescription::try_create(*this);
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if (!description.is_error()) {
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description.value()->set_rw_mode(options);
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description.value()->set_file_flags(options);
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}
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return description;
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}
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ErrorOr<void> File::close()
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{
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return {};
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}
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ErrorOr<void> File::ioctl(OpenFileDescription&, unsigned, Userspace<void*>)
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{
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return ENOTTY;
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}
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ErrorOr<NonnullLockRefPtr<Memory::VMObject>> File::vmobject_for_mmap(Process&, Memory::VirtualRange const&, u64&, bool)
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{
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return ENODEV;
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}
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ErrorOr<void> File::attach(OpenFileDescription&)
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{
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m_attach_count++;
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return {};
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}
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void File::detach(OpenFileDescription&)
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{
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m_attach_count--;
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}
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}
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