Identify tasks which mmap'ed file

[W. Michael Petullo]

Within the kernel and given a struct file *, is it possible to enumerate
the tasks which have mmap/MAP_SHARED'ed the file? I have tried to use
find_get_pages/rmap_walk on the file's f_mapping field, but this does
not seem to work. I find the mapping's first page with find_get_pages,
but rmap_walk does not seem to find any vma's as rmap_walk never calls
the callback function I pass in.

Thank you,

-- 
Mike

:wq