mirror of
https://github.com/RGBCube/serenity
synced 2025-07-27 21:07:34 +00:00
Kernel: Split VMObject into two classes: Anonymous- and InodeVMObject
InodeVMObject is a VMObject with an underlying Inode in the filesystem. AnonymousVMObject has no Inode. I'm happy that InodeVMObject::inode() can now return Inode& instead of VMObject::inode() return Inode*. :^)
This commit is contained in:
parent
cb2d572a14
commit
6bdb81ad87
16 changed files with 286 additions and 200 deletions
41
Kernel/VM/AnonymousVMObject.cpp
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41
Kernel/VM/AnonymousVMObject.cpp
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@ -0,0 +1,41 @@
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#include <Kernel/VM/AnonymousVMObject.h>
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#include <Kernel/VM/PhysicalPage.h>
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NonnullRefPtr<AnonymousVMObject> AnonymousVMObject::create_with_size(size_t size)
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{
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size = ceil_div(size, PAGE_SIZE) * PAGE_SIZE;
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return adopt(*new AnonymousVMObject(size));
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}
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NonnullRefPtr<AnonymousVMObject> AnonymousVMObject::create_for_physical_range(PhysicalAddress paddr, size_t size)
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{
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size = ceil_div(size, PAGE_SIZE) * PAGE_SIZE;
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return adopt(*new AnonymousVMObject(paddr, size));
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}
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AnonymousVMObject::AnonymousVMObject(size_t size)
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: VMObject(size, ShouldFillPhysicalPages::Yes)
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{
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}
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AnonymousVMObject::AnonymousVMObject(PhysicalAddress paddr, size_t size)
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: VMObject(size, ShouldFillPhysicalPages::No)
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{
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for (size_t i = 0; i < size; i += PAGE_SIZE)
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m_physical_pages.append(PhysicalPage::create(paddr.offset(i), false, false));
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ASSERT(m_physical_pages.size() == page_count());
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}
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AnonymousVMObject::AnonymousVMObject(const AnonymousVMObject& other)
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: VMObject(other)
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{
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}
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AnonymousVMObject::~AnonymousVMObject()
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{
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}
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NonnullRefPtr<VMObject> AnonymousVMObject::clone()
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{
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return adopt(*new AnonymousVMObject(*this));
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}
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24
Kernel/VM/AnonymousVMObject.h
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24
Kernel/VM/AnonymousVMObject.h
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@ -0,0 +1,24 @@
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#pragma once
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#include <Kernel/VM/PhysicalAddress.h>
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#include <Kernel/VM/VMObject.h>
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class AnonymousVMObject final : public VMObject {
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public:
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virtual ~AnonymousVMObject() override;
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static NonnullRefPtr<AnonymousVMObject> create_with_size(size_t);
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static NonnullRefPtr<AnonymousVMObject> create_for_physical_range(PhysicalAddress, size_t);
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virtual NonnullRefPtr<VMObject> clone() override;
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private:
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explicit AnonymousVMObject(size_t);
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explicit AnonymousVMObject(const AnonymousVMObject&);
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AnonymousVMObject(PhysicalAddress, size_t);
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AnonymousVMObject& operator=(const AnonymousVMObject&) = delete;
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AnonymousVMObject& operator=(AnonymousVMObject&&) = delete;
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AnonymousVMObject(AnonymousVMObject&&) = delete;
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virtual bool is_anonymous() const override { return true; }
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};
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131
Kernel/VM/InodeVMObject.cpp
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131
Kernel/VM/InodeVMObject.cpp
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@ -0,0 +1,131 @@
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#include <Kernel/FileSystem/Inode.h>
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#include <Kernel/VM/InodeVMObject.h>
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#include <Kernel/VM/MemoryManager.h>
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#include <Kernel/VM/Region.h>
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NonnullRefPtr<InodeVMObject> InodeVMObject::create_with_inode(Inode& inode)
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{
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InterruptDisabler disabler;
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if (inode.vmo())
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return *inode.vmo();
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auto vmo = adopt(*new InodeVMObject(inode));
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vmo->inode().set_vmo(*vmo);
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return vmo;
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}
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NonnullRefPtr<VMObject> InodeVMObject::clone()
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{
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return adopt(*new InodeVMObject(*this));
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}
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InodeVMObject::InodeVMObject(Inode& inode)
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: VMObject(ceil_div(inode.size(), PAGE_SIZE) * PAGE_SIZE, ShouldFillPhysicalPages::Yes)
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, m_inode(inode)
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{
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}
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InodeVMObject::InodeVMObject(const InodeVMObject& other)
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: VMObject(other)
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, m_inode(other.m_inode)
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{
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}
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InodeVMObject::~InodeVMObject()
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{
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ASSERT(inode().vmo() == this);
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}
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void InodeVMObject::inode_size_changed(Badge<Inode>, size_t old_size, size_t new_size)
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{
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dbgprintf("VMObject::inode_size_changed: {%u:%u} %u -> %u\n",
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m_inode->fsid(), m_inode->index(),
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old_size, new_size);
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InterruptDisabler disabler;
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auto old_page_count = page_count();
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m_size = new_size;
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if (page_count() > old_page_count) {
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// Add null pages and let the fault handler page these in when that day comes.
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for (auto i = old_page_count; i < page_count(); ++i)
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m_physical_pages.append(nullptr);
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} else {
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// Prune the no-longer valid pages. I'm not sure this is actually correct behavior.
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for (auto i = page_count(); i < old_page_count; ++i)
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m_physical_pages.take_last();
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}
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// FIXME: Consolidate with inode_contents_changed() so we only do a single walk.
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for_each_region([](Region& region) {
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ASSERT(region.page_directory());
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MM.remap_region(*region.page_directory(), region);
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});
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}
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void InodeVMObject::inode_contents_changed(Badge<Inode>, off_t offset, ssize_t size, const u8* data)
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{
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(void)size;
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(void)data;
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InterruptDisabler disabler;
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ASSERT(offset >= 0);
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// FIXME: Only invalidate the parts that actually changed.
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for (auto& physical_page : m_physical_pages)
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physical_page = nullptr;
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#if 0
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size_t current_offset = offset;
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size_t remaining_bytes = size;
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const u8* data_ptr = data;
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auto to_page_index = [] (size_t offset) -> size_t {
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return offset / PAGE_SIZE;
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};
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if (current_offset & PAGE_MASK) {
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size_t page_index = to_page_index(current_offset);
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size_t bytes_to_copy = min(size, PAGE_SIZE - (current_offset & PAGE_MASK));
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if (m_physical_pages[page_index]) {
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auto* ptr = MM.quickmap_page(*m_physical_pages[page_index]);
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memcpy(ptr, data_ptr, bytes_to_copy);
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MM.unquickmap_page();
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}
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current_offset += bytes_to_copy;
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data += bytes_to_copy;
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remaining_bytes -= bytes_to_copy;
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}
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for (size_t page_index = to_page_index(current_offset); page_index < m_physical_pages.size(); ++page_index) {
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size_t bytes_to_copy = PAGE_SIZE - (current_offset & PAGE_MASK);
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if (m_physical_pages[page_index]) {
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auto* ptr = MM.quickmap_page(*m_physical_pages[page_index]);
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memcpy(ptr, data_ptr, bytes_to_copy);
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MM.unquickmap_page();
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}
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current_offset += bytes_to_copy;
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data += bytes_to_copy;
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}
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#endif
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// FIXME: Consolidate with inode_size_changed() so we only do a single walk.
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for_each_region([](Region& region) {
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ASSERT(region.page_directory());
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MM.remap_region(*region.page_directory(), region);
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});
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}
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template<typename Callback>
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void VMObject::for_each_region(Callback callback)
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{
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// FIXME: Figure out a better data structure so we don't have to walk every single region every time an inode changes.
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// Perhaps VMObject could have a Vector<Region*> with all of his mappers?
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for (auto* region : MM.m_user_regions) {
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if (®ion->vmo() == this)
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callback(*region);
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}
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for (auto* region : MM.m_kernel_regions) {
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if (®ion->vmo() == this)
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callback(*region);
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}
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}
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30
Kernel/VM/InodeVMObject.h
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30
Kernel/VM/InodeVMObject.h
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@ -0,0 +1,30 @@
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#pragma once
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#include <Kernel/UnixTypes.h>
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#include <Kernel/VM/VMObject.h>
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class InodeVMObject final : public VMObject {
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public:
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virtual ~InodeVMObject() override;
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static NonnullRefPtr<InodeVMObject> create_with_inode(Inode&);
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virtual NonnullRefPtr<VMObject> clone() override;
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Inode& inode() { return *m_inode; }
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const Inode& inode() const { return *m_inode; }
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void inode_contents_changed(Badge<Inode>, off_t, ssize_t, const u8*);
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void inode_size_changed(Badge<Inode>, size_t old_size, size_t new_size);
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private:
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explicit InodeVMObject(Inode&);
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explicit InodeVMObject(const InodeVMObject&);
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InodeVMObject& operator=(const InodeVMObject&) = delete;
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InodeVMObject& operator=(InodeVMObject&&) = delete;
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InodeVMObject(InodeVMObject&&) = delete;
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virtual bool is_inode() const override { return true; }
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NonnullRefPtr<Inode> m_inode;
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};
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@ -6,6 +6,8 @@
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#include <Kernel/Arch/i386/CPU.h>
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#include <Kernel/FileSystem/Inode.h>
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#include <Kernel/Multiboot.h>
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#include <Kernel/VM/AnonymousVMObject.h>
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#include <Kernel/VM/InodeVMObject.h>
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#include <Kernel/VM/MemoryManager.h>
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//#define MM_DEBUG
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{
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ASSERT(region.page_directory());
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auto& vmo = region.vmo();
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ASSERT(!vmo.is_anonymous());
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ASSERT(vmo.inode());
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ASSERT(vmo.is_inode());
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auto& vmo_page = vmo.physical_pages()[region.first_page_index() + page_index_in_region];
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auto& inode_vmobject = static_cast<InodeVMObject&>(vmo);
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auto& vmo_page = inode_vmobject.physical_pages()[region.first_page_index() + page_index_in_region];
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InterruptFlagSaver saver;
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@ -374,8 +377,8 @@ bool MemoryManager::page_in_from_inode(Region& region, unsigned page_index_in_re
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#endif
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sti();
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u8 page_buffer[PAGE_SIZE];
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auto& inode = *vmo.inode();
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auto nread = inode.read_bytes(vmo.inode_offset() + ((region.first_page_index() + page_index_in_region) * PAGE_SIZE), PAGE_SIZE, page_buffer, nullptr);
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auto& inode = inode_vmobject.inode();
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auto nread = inode.read_bytes((region.first_page_index() + page_index_in_region) * PAGE_SIZE, PAGE_SIZE, page_buffer, nullptr);
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if (nread < 0) {
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kprintf("MM: page_in_from_inode had error (%d) while reading!\n", nread);
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return false;
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@ -435,7 +438,7 @@ PageFaultResponse MemoryManager::handle_page_fault(const PageFault& fault)
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}
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auto page_index_in_region = region->page_index_from_address(fault.vaddr());
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if (fault.type() == PageFault::Type::PageNotPresent) {
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if (region->vmo().inode()) {
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if (region->vmo().is_inode()) {
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#ifdef PAGE_FAULT_DEBUG
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dbgprintf("NP(inode) fault in Region{%p}[%u]\n", region, page_index_in_region);
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#endif
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@ -1,13 +1,14 @@
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#include <Kernel/FileSystem/Inode.h>
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#include <Kernel/Process.h>
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#include <Kernel/Thread.h>
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#include <Kernel/VM/AnonymousVMObject.h>
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#include <Kernel/VM/InodeVMObject.h>
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#include <Kernel/VM/MemoryManager.h>
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#include <Kernel/VM/Region.h>
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#include <Kernel/VM/VMObject.h>
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Region::Region(const Range& range, const String& name, u8 access, bool cow)
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: m_range(range)
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, m_vmo(VMObject::create_anonymous(size()))
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, m_vmo(AnonymousVMObject::create_with_size(size()))
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, m_name(name)
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, m_access(access)
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, m_cow_map(Bitmap::create(m_vmo->page_count(), cow))
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@ -17,7 +18,7 @@ Region::Region(const Range& range, const String& name, u8 access, bool cow)
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Region::Region(const Range& range, RefPtr<Inode>&& inode, const String& name, u8 access, bool cow)
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: m_range(range)
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, m_vmo(VMObject::create_file_backed(move(inode)))
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, m_vmo(InodeVMObject::create_with_inode(*inode))
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, m_name(name)
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, m_access(access)
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, m_cow_map(Bitmap::create(m_vmo->page_count(), cow))
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@ -48,8 +49,7 @@ Region::~Region()
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bool Region::page_in()
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{
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ASSERT(m_page_directory);
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ASSERT(!vmo().is_anonymous());
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ASSERT(vmo().inode());
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ASSERT(vmo().is_inode());
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#ifdef MM_DEBUG
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dbgprintf("MM: page_in %u pages\n", page_count());
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#endif
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@ -3,166 +3,22 @@
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#include <Kernel/VM/MemoryManager.h>
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#include <Kernel/VM/VMObject.h>
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NonnullRefPtr<VMObject> VMObject::create_file_backed(RefPtr<Inode>&& inode)
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{
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InterruptDisabler disabler;
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if (inode->vmo())
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return *inode->vmo();
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auto vmo = adopt(*new VMObject(move(inode)));
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vmo->inode()->set_vmo(*vmo);
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return vmo;
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}
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NonnullRefPtr<VMObject> VMObject::create_anonymous(size_t size)
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{
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size = ceil_div(size, PAGE_SIZE) * PAGE_SIZE;
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return adopt(*new VMObject(size));
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}
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NonnullRefPtr<VMObject> VMObject::create_for_physical_range(PhysicalAddress paddr, size_t size)
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{
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size = ceil_div(size, PAGE_SIZE) * PAGE_SIZE;
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return adopt(*new VMObject(paddr, size));
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}
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NonnullRefPtr<VMObject> VMObject::clone()
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{
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return adopt(*new VMObject(*this));
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}
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VMObject::VMObject(VMObject& other)
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: m_inode_offset(other.m_inode_offset)
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, m_size(other.m_size)
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, m_inode(other.m_inode)
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VMObject::VMObject(const VMObject& other)
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: m_size(other.m_size)
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, m_physical_pages(other.m_physical_pages)
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{
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MM.register_vmo(*this);
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}
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VMObject::VMObject(size_t size)
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VMObject::VMObject(size_t size, ShouldFillPhysicalPages should_fill_physical_pages)
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: m_size(size)
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{
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MM.register_vmo(*this);
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m_physical_pages.resize(page_count());
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}
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VMObject::VMObject(PhysicalAddress paddr, size_t size)
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: m_size(size)
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{
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MM.register_vmo(*this);
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for (size_t i = 0; i < size; i += PAGE_SIZE) {
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m_physical_pages.append(PhysicalPage::create(paddr.offset(i), false, false));
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}
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ASSERT(m_physical_pages.size() == page_count());
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}
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VMObject::VMObject(RefPtr<Inode>&& inode)
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: m_inode(move(inode))
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{
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ASSERT(m_inode);
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m_size = ceil_div(m_inode->size(), PAGE_SIZE) * PAGE_SIZE;
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m_physical_pages.resize(page_count());
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MM.register_vmo(*this);
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if (should_fill_physical_pages == ShouldFillPhysicalPages::Yes)
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m_physical_pages.resize(page_count());
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}
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VMObject::~VMObject()
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{
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if (m_inode)
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ASSERT(m_inode->vmo() == this);
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MM.unregister_vmo(*this);
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}
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template<typename Callback>
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void VMObject::for_each_region(Callback callback)
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{
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// FIXME: Figure out a better data structure so we don't have to walk every single region every time an inode changes.
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// Perhaps VMObject could have a Vector<Region*> with all of his mappers?
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for (auto* region : MM.m_user_regions) {
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if (®ion->vmo() == this)
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callback(*region);
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}
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for (auto* region : MM.m_kernel_regions) {
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if (®ion->vmo() == this)
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callback(*region);
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}
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}
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void VMObject::inode_size_changed(Badge<Inode>, size_t old_size, size_t new_size)
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{
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dbgprintf("VMObject::inode_size_changed: {%u:%u} %u -> %u\n",
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m_inode->fsid(), m_inode->index(),
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old_size, new_size);
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InterruptDisabler disabler;
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auto old_page_count = page_count();
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m_size = new_size;
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if (page_count() > old_page_count) {
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// Add null pages and let the fault handler page these in when that day comes.
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for (auto i = old_page_count; i < page_count(); ++i)
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m_physical_pages.append(nullptr);
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} else {
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// Prune the no-longer valid pages. I'm not sure this is actually correct behavior.
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for (auto i = page_count(); i < old_page_count; ++i)
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m_physical_pages.take_last();
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}
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// FIXME: Consolidate with inode_contents_changed() so we only do a single walk.
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for_each_region([](Region& region) {
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ASSERT(region.page_directory());
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MM.remap_region(*region.page_directory(), region);
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});
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}
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|
||||
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);
|
||||
});
|
||||
}
|
||||
|
|
|
@ -1,14 +1,10 @@
|
|||
#pragma once
|
||||
|
||||
#include <AK/AKString.h>
|
||||
#include <AK/Badge.h>
|
||||
#include <AK/RefPtr.h>
|
||||
#include <AK/RefCounted.h>
|
||||
#include <AK/RefPtr.h>
|
||||
#include <AK/Vector.h>
|
||||
#include <AK/Weakable.h>
|
||||
#include <Kernel/Lock.h>
|
||||
#include <Kernel/UnixTypes.h>
|
||||
#include <Kernel/VM/PhysicalAddress.h>
|
||||
|
||||
class Inode;
|
||||
class PhysicalPage;
|
||||
|
@ -18,39 +14,37 @@ class VMObject : public RefCounted<VMObject>
|
|||
friend class MemoryManager;
|
||||
|
||||
public:
|
||||
static NonnullRefPtr<VMObject> create_file_backed(RefPtr<Inode>&&);
|
||||
static NonnullRefPtr<VMObject> create_anonymous(size_t);
|
||||
static NonnullRefPtr<VMObject> create_for_physical_range(PhysicalAddress, size_t);
|
||||
NonnullRefPtr<VMObject> clone();
|
||||
virtual ~VMObject();
|
||||
|
||||
~VMObject();
|
||||
bool is_anonymous() const { return !m_inode; }
|
||||
virtual NonnullRefPtr<VMObject> clone() = 0;
|
||||
|
||||
Inode* inode() { return m_inode.ptr(); }
|
||||
const Inode* inode() const { return m_inode.ptr(); }
|
||||
size_t inode_offset() const { return m_inode_offset; }
|
||||
virtual bool is_anonymous() const { return false; }
|
||||
virtual bool is_inode() const { return false; }
|
||||
|
||||
int page_count() const { return m_size / PAGE_SIZE; }
|
||||
const Vector<RefPtr<PhysicalPage>>& physical_pages() const { return m_physical_pages; }
|
||||
Vector<RefPtr<PhysicalPage>>& physical_pages() { return m_physical_pages; }
|
||||
|
||||
void inode_contents_changed(Badge<Inode>, off_t, ssize_t, const u8*);
|
||||
void inode_size_changed(Badge<Inode>, size_t old_size, size_t new_size);
|
||||
|
||||
size_t size() const { return m_size; }
|
||||
|
||||
private:
|
||||
VMObject(RefPtr<Inode>&&);
|
||||
explicit VMObject(VMObject&);
|
||||
explicit VMObject(size_t);
|
||||
VMObject(PhysicalAddress, size_t);
|
||||
protected:
|
||||
enum ShouldFillPhysicalPages {
|
||||
No = 0,
|
||||
Yes
|
||||
};
|
||||
VMObject(size_t, ShouldFillPhysicalPages);
|
||||
explicit VMObject(const VMObject&);
|
||||
|
||||
template<typename Callback>
|
||||
void for_each_region(Callback);
|
||||
|
||||
off_t m_inode_offset { 0 };
|
||||
size_t m_size { 0 };
|
||||
RefPtr<Inode> m_inode;
|
||||
Vector<RefPtr<PhysicalPage>> m_physical_pages;
|
||||
|
||||
private:
|
||||
VMObject& operator=(const VMObject&) = delete;
|
||||
VMObject& operator=(VMObject&&) = delete;
|
||||
VMObject(VMObject&&) = delete;
|
||||
|
||||
Lock m_paging_lock { "VMObject" };
|
||||
};
|
||||
|
|
Loading…
Add table
Add a link
Reference in a new issue