FILEMAP_FAULT(9)                    Memory Management in Linux                   FILEMAP_FAULT(9)



NAME
       filemap_fault - read in file data for page fault handling

SYNOPSIS
       int filemap_fault(struct vm_area_struct * vma, struct vm_fault * vmf);

ARGUMENTS
       vma
           vma in which the fault was taken

       vmf
           struct vm_fault containing details of the fault

DESCRIPTION
       filemap_fault 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.

       vma->vm_mm->mmap_sem must be held on entry.

       If our return value has VM_FAULT_RETRY set, it's because lock_page_or_retry returned 0.
       The mmap_sem has usually been released in this case. See __lock_page_or_retry for the
       exception.

       If our return value does not have VM_FAULT_RETRY set, the mmap_sem has not been released.

       We never return with VM_FAULT_RETRY and a bit from VM_FAULT_ERROR set.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                          FILEMAP_FAULT(9)