filemap_nopage9
Read in file data for page fault handling
Usage
struct page * filemap_nopage(struct vm_area_struct * area, unsigned long address, int * type);
Arguments
area
the applicable vm_area
address
target address to read in
type
returned with VM_FAULT_{MINOR,MAJOR} if not NULL
Overview
filemap_nopage is invoked via the vma operations vector for a mapped memory region to read in file data during a page fault.
The goto's are kind of ugly, but this streamlines the normal case of having it in the page cache, and handles the special cases reasonably without having a lot of duplicated code.