mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-21 02:08:12 +03:00
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.
34 lines
785 B
C++
34 lines
785 B
C++
/*
|
|
* Copyright (c) 2021-2022, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <Kernel/FileSystem/AnonymousFile.h>
|
|
#include <Kernel/Memory/AnonymousVMObject.h>
|
|
#include <Kernel/Process.h>
|
|
|
|
namespace Kernel {
|
|
|
|
AnonymousFile::AnonymousFile(NonnullLockRefPtr<Memory::AnonymousVMObject> vmobject)
|
|
: m_vmobject(move(vmobject))
|
|
{
|
|
}
|
|
|
|
AnonymousFile::~AnonymousFile() = default;
|
|
|
|
ErrorOr<NonnullLockRefPtr<Memory::VMObject>> AnonymousFile::vmobject_for_mmap(Process&, Memory::VirtualRange const&, u64& offset, bool)
|
|
{
|
|
if (offset != 0)
|
|
return EINVAL;
|
|
|
|
return m_vmobject;
|
|
}
|
|
|
|
ErrorOr<NonnullOwnPtr<KString>> AnonymousFile::pseudo_path(OpenFileDescription const&) const
|
|
{
|
|
return KString::try_create(":anonymous-file:"sv);
|
|
}
|
|
|
|
}
|