[PATCH 0/5 -tip] umount_begin BKL pushdown

[Alessio Igor Bogani]

Push the BKL acquisition from vfs to every specific filesystems
with hope that it can be eliminated in a second moment.

The first 4 patches add BKL lock into umount_begin() functions (for
the filesystems that have this handler). The last one remove
lock_kernel()/unlock_kernel() from fs/namespace.c (the only point
that invoke umount_begin() funtcions).
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