This patch series is for the release 3.4.
It is reported by Kuwamura that blktap has been broken on ia64.
But I think it is broken also on x86.

The change set of 863:464a925d73f1 broken blktap because
guest_user_pages() assumes vma->vm_private_data is arrays
of struct page*.
This patch series fixes it by not keeping vma in struct tap_blkif.
Anyway it isn't allowed to keep the pointer to vma without holding
the semaphore, mmap_sem. So this patch makes it get mm_struct and
use find_vma() to find necessary vma.

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