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f86b671de2
Move away from using the group ID/user ID helpers in the process to allow for us to take advantage of the immutable credentials instead.
72 lines
2.7 KiB
C++
72 lines
2.7 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 <Kernel/Library/NonnullLockRefPtrVector.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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TRY(require_no_promises());
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auto credentials = this->credentials();
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if (!credentials->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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NonnullLockRefPtrVector<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 (auto append_result = vmobjects.try_append(static_cast<Memory::AnonymousVMObject&>(vmobject)); append_result.is_error() && vmobjects.is_empty()) {
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result = append_result.release_error();
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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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NonnullLockRefPtrVector<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 (auto append_result = vmobjects.try_append(static_cast<Memory::InodeVMObject&>(vmobject)); append_result.is_error() && vmobjects.is_empty()) {
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result = append_result.release_error();
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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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