How does the page fault handler know where to get the 4K bytes?

Question

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.

Answer 1

I found out that vm_file in vm_area_struct was just what I was looking for. – xiaokaoy