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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/VM/InodeVMObject.h>
#include <Kernel/VM/MemoryManager.h>
namespace Kernel {
InodeVMObject::InodeVMObject(Inode& inode, size_t size)
: VMObject(size)
, m_inode(inode)
, m_dirty_pages(page_count(), false)
{
}
InodeVMObject::InodeVMObject(const InodeVMObject& other)
: VMObject(other)
, m_inode(other.m_inode)
, m_dirty_pages(page_count(), false)
{
for (size_t i = 0; i < page_count(); ++i)
m_dirty_pages.set(i, other.m_dirty_pages.get(i));
}
InodeVMObject::~InodeVMObject()
{
}
size_t InodeVMObject::amount_clean() const
{
size_t count = 0;
VERIFY(page_count() == m_dirty_pages.size());
for (size_t i = 0; i < page_count(); ++i) {
if (!m_dirty_pages.get(i) && m_physical_pages[i])
++count;
}
return count * PAGE_SIZE;
}
size_t InodeVMObject::amount_dirty() const
{
size_t count = 0;
for (size_t i = 0; i < m_dirty_pages.size(); ++i) {
if (m_dirty_pages.get(i))
++count;
}
return count * PAGE_SIZE;
}
int InodeVMObject::release_all_clean_pages()
{
LOCKER(m_paging_lock);
return release_all_clean_pages_impl();
}
int InodeVMObject::release_all_clean_pages_impl()
{
int count = 0;
InterruptDisabler disabler;
for (size_t i = 0; i < page_count(); ++i) {
if (!m_dirty_pages.get(i) && m_physical_pages[i]) {
m_physical_pages[i] = nullptr;
++count;
}
}
for_each_region([](auto& region) {
region.remap();
});
return count;
}
u32 InodeVMObject::writable_mappings() const
{
u32 count = 0;
const_cast<InodeVMObject&>(*this).for_each_region([&](auto& region) {
if (region.is_writable())
++count;
});
return count;
}
u32 InodeVMObject::executable_mappings() const
{
u32 count = 0;
const_cast<InodeVMObject&>(*this).for_each_region([&](auto& region) {
if (region.is_executable())
++count;
});
return count;
}
}
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