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https://github.com/SerenityOS/serenity
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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
72 lines
2.5 KiB
C++
72 lines
2.5 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/NonnullRefPtrVector.h>
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#include <Kernel/Memory/AnonymousVMObject.h>
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#include <Kernel/Memory/InodeVMObject.h>
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#include <Kernel/Memory/MemoryManager.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$purge(int mode)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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REQUIRE_NO_PROMISES;
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if (!is_superuser())
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return EPERM;
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size_t purged_page_count = 0;
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if (mode & PURGE_ALL_VOLATILE) {
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NonnullRefPtrVector<Memory::AnonymousVMObject> vmobjects;
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{
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ErrorOr<void> result;
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Memory::MemoryManager::for_each_vmobject([&](auto& vmobject) {
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if (vmobject.is_anonymous()) {
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// In the event that the append fails, only attempt to continue
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// the purge if we have already appended something successfully.
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if (!vmobjects.try_append(static_cast<Memory::AnonymousVMObject&>(vmobject)) && vmobjects.is_empty()) {
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result = ENOMEM;
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return IterationDecision::Break;
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}
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}
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return IterationDecision::Continue;
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});
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if (result.is_error())
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return result.release_error();
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}
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for (auto& vmobject : vmobjects) {
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purged_page_count += vmobject.purge();
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}
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}
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if (mode & PURGE_ALL_CLEAN_INODE) {
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NonnullRefPtrVector<Memory::InodeVMObject> vmobjects;
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{
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ErrorOr<void> result;
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Memory::MemoryManager::for_each_vmobject([&](auto& vmobject) {
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if (vmobject.is_inode()) {
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// In the event that the append fails, only attempt to continue
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// the purge if we have already appended something successfully.
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if (!vmobjects.try_append(static_cast<Memory::InodeVMObject&>(vmobject)) && vmobjects.is_empty()) {
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result = ENOMEM;
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return IterationDecision::Break;
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}
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}
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return IterationDecision::Continue;
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});
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if (result.is_error())
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return result.release_error();
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}
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for (auto& vmobject : vmobjects) {
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purged_page_count += vmobject.release_all_clean_pages();
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}
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}
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return purged_page_count;
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}
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}
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