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Kernel: Don't rewrite the whole file on sys$msync
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259f78545a
commit
c7b90fa7d3
3 changed files with 10 additions and 4 deletions
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@ -35,11 +35,13 @@ SharedInodeVMObject::SharedInodeVMObject(SharedInodeVMObject const& other)
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{
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}
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ErrorOr<void> SharedInodeVMObject::sync()
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ErrorOr<void> SharedInodeVMObject::sync(off_t offset_in_pages, size_t pages)
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{
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SpinlockLocker locker(m_lock);
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for (size_t page_index = 0; page_index < page_count(); ++page_index) {
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size_t highest_page_to_flush = min(page_count(), offset_in_pages + pages);
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for (size_t page_index = offset_in_pages; page_index < highest_page_to_flush; ++page_index) {
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auto& physical_page = m_physical_pages[page_index];
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if (!physical_page)
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continue;
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@ -18,7 +18,7 @@ public:
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static ErrorOr<NonnullRefPtr<SharedInodeVMObject>> try_create_with_inode(Inode&);
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virtual ErrorOr<NonnullRefPtr<VMObject>> try_clone() override;
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ErrorOr<void> sync();
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ErrorOr<void> sync(off_t offset_in_pages = 0, size_t pages = -1);
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private:
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virtual bool is_shared_inode() const override { return true; }
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@ -616,8 +616,12 @@ ErrorOr<FlatPtr> Process::sys$msync(Userspace<void*> address, size_t size, int f
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if (!vmobject.is_shared_inode())
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return 0;
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off_t offset = region->offset_in_vmobject() + address.ptr() - region->range().base().get();
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auto& inode_vmobject = static_cast<Memory::SharedInodeVMObject&>(vmobject);
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TRY(inode_vmobject.sync());
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// FIXME: Handle MS_ASYNC
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TRY(inode_vmobject.sync(offset / PAGE_SIZE, size / PAGE_SIZE));
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// FIXME: Handle MS_INVALIDATE
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// FIXME: If msync() causes any write to a file, the file's st_ctime and st_mtime fields shall be marked for update.
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return 0;
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}
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