问题
I mean, which file and what's the offset into the file?
The page fault handler need to copy 4K bytes from there into the physical RAM.
----------------------EDIT----------------------------
I found out that vm_file in vm_area_struct was just what I was looking for.
回答1:
I found out that vm_file in vm_area_struct was just what I was looking for. – xiaokaoy
来源：https://stackoverflow.com/questions/38850533/how-does-the-page-fault-handler-know-where-to-get-the-4k-bytes