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#include <Kernel/FileSystem/FileSystem.h>
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/VM/VMObject.h>
NonnullRefPtr<VMObject> VMObject::create_file_backed(RefPtr<Inode>&& inode)
{
InterruptDisabler disabler;
if (inode->vmo())
return *inode->vmo();
auto vmo = adopt(*new VMObject(move(inode)));
vmo->inode()->set_vmo(*vmo);
return vmo;
}
NonnullRefPtr<VMObject> VMObject::create_anonymous(size_t size)
{
size = ceil_div(size, PAGE_SIZE) * PAGE_SIZE;
return adopt(*new VMObject(size));
}
NonnullRefPtr<VMObject> VMObject::create_for_physical_range(PhysicalAddress paddr, size_t size)
{
size = ceil_div(size, PAGE_SIZE) * PAGE_SIZE;
auto vmo = adopt(*new VMObject(paddr, size));
vmo->m_allow_cpu_caching = false;
return vmo;
}
NonnullRefPtr<VMObject> VMObject::clone()
{
return adopt(*new VMObject(*this));
}
VMObject::VMObject(VMObject& other)
: m_name(other.m_name)
, m_inode_offset(other.m_inode_offset)
, m_size(other.m_size)
, m_inode(other.m_inode)
, m_physical_pages(other.m_physical_pages)
{
MM.register_vmo(*this);
}
VMObject::VMObject(size_t size)
: m_size(size)
{
MM.register_vmo(*this);
m_physical_pages.resize(page_count());
}
VMObject::VMObject(PhysicalAddress paddr, size_t size)
: m_size(size)
{
MM.register_vmo(*this);
for (size_t i = 0; i < size; i += PAGE_SIZE) {
m_physical_pages.append(PhysicalPage::create(paddr.offset(i), false, false));
}
ASSERT(m_physical_pages.size() == page_count());
}
VMObject::VMObject(RefPtr<Inode>&& inode)
: m_inode(move(inode))
{
ASSERT(m_inode);
m_size = ceil_div(m_inode->size(), PAGE_SIZE) * PAGE_SIZE;
m_physical_pages.resize(page_count());
MM.register_vmo(*this);
}
VMObject::~VMObject()
{
if (m_inode)
ASSERT(m_inode->vmo() == this);
MM.unregister_vmo(*this);
}
template<typename Callback>
void VMObject::for_each_region(Callback callback)
{
// FIXME: Figure out a better data structure so we don't have to walk every single region every time an inode changes.
// Perhaps VMObject could have a Vector<Region*> with all of his mappers?
for (auto* region : MM.m_user_regions) {
if (®ion->vmo() == this)
callback(*region);
}
for (auto* region : MM.m_kernel_regions) {
if (®ion->vmo() == this)
callback(*region);
}
}
void VMObject::inode_size_changed(Badge<Inode>, size_t old_size, size_t new_size)
{
dbgprintf("VMObject::inode_size_changed: {%u:%u} %u -> %u\n",
m_inode->fsid(), m_inode->index(),
old_size, new_size);
InterruptDisabler disabler;
auto old_page_count = page_count();
m_size = new_size;
if (page_count() > old_page_count) {
// Add null pages and let the fault handler page these in when that day comes.
for (auto i = old_page_count; i < page_count(); ++i)
m_physical_pages.append(nullptr);
} else {
// Prune the no-longer valid pages. I'm not sure this is actually correct behavior.
for (auto i = page_count(); i < old_page_count; ++i)
m_physical_pages.take_last();
}
// FIXME: Consolidate with inode_contents_changed() so we only do a single walk.
for_each_region([](Region& region) {
ASSERT(region.page_directory());
MM.remap_region(*region.page_directory(), region);
});
}
void VMObject::inode_contents_changed(Badge<Inode>, off_t offset, ssize_t size, const u8* data)
{
(void)size;
(void)data;
InterruptDisabler disabler;
ASSERT(offset >= 0);
// FIXME: Only invalidate the parts that actually changed.
for (auto& physical_page : m_physical_pages)
physical_page = nullptr;
#if 0
size_t current_offset = offset;
size_t remaining_bytes = size;
const u8* data_ptr = data;
auto to_page_index = [] (size_t offset) -> size_t {
return offset / PAGE_SIZE;
};
if (current_offset & PAGE_MASK) {
size_t page_index = to_page_index(current_offset);
size_t bytes_to_copy = min(size, PAGE_SIZE - (current_offset & PAGE_MASK));
if (m_physical_pages[page_index]) {
auto* ptr = MM.quickmap_page(*m_physical_pages[page_index]);
memcpy(ptr, data_ptr, bytes_to_copy);
MM.unquickmap_page();
}
current_offset += bytes_to_copy;
data += bytes_to_copy;
remaining_bytes -= bytes_to_copy;
}
for (size_t page_index = to_page_index(current_offset); page_index < m_physical_pages.size(); ++page_index) {
size_t bytes_to_copy = PAGE_SIZE - (current_offset & PAGE_MASK);
if (m_physical_pages[page_index]) {
auto* ptr = MM.quickmap_page(*m_physical_pages[page_index]);
memcpy(ptr, data_ptr, bytes_to_copy);
MM.unquickmap_page();
}
current_offset += bytes_to_copy;
data += bytes_to_copy;
}
#endif
// FIXME: Consolidate with inode_size_changed() so we only do a single walk.
for_each_region([](Region& region) {
ASSERT(region.page_directory());
MM.remap_region(*region.page_directory(), region);
});
}
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