[PATCH vfs-2.6:for-next] Push BKL down into ->remount_fs() v2

[Alessio Igor Bogani]

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

Changes from previous version:

Removed useless BKL from some filesystems which don't require it.

Reduced BKL acquisition as short as possible.

Signed-off-by: Alessio Igor Bogani <abogani@xxxxxxxxxx>
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