doubt about VMA struct

["pradeep singh" <2500.pradeep@xxxxxxxxx>]

Hi all,

All questions are related to linux-2.6.20.1.

file linux/mm.h has VMA struct declaration as -

struct vm_area_struct {
  ...

 struct vm_operations_struct *vm_ops;
  ...

}

vma_ops is the pointer to the operations related to this VMA struct
for our process address space(i.e mm_struct) AFAIK.

My question is declaration of the struct vm_operations_struct in the
same file have some interesting members like
  - open
  - close
  - nopage  etc.
since there is an open and a close related to every VMA struct for a
process address space, does this means vm_area_struct for a process's
address space is treated like a file?( in terms with the philosophy of
almost everything is file :) ) .

Does it means accessing a virtual address space for a process is not
allowed if open fails or is not allowed?( suppose i do that
delibarately in my module ).

What if a open succeeds for a vma struct but close fails?

Am i missing something with the concept of "everything is file" ?

Thank you

--psr


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