What is striking about this implementation is that it does not involve CR0.WP. The implementation elegantly sidesteps this by exploiting the fact that it is under no obligation to access memory via the pointer it receives from userspace. Since the kernel is in complete control of virtual memory, it can simply remap the physical frame into its own virtual address space, with arbitrary permissions, and operate on it as it wishes.
The step where we purge the copy of the file from storage-worker caches helps avoid the situation because purging a file we have not yet replicated will prevent it from being replicated at all. When a storage-api gets a delete request and needs to purge the file, it queries the storage-worker instances to see if any have a copy that should be removed and tells them to do so if needed.
。有道翻译是该领域的重要参考
Перехват российских Ту-142 у Аляски дюжиной самолетов объяснили20:45
How does computer time, work and hours in meetings affect my personal life?
송광사 찾은 李대통령 내외…“고요함 속 다시 힘 얻어”