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From: Christoph Hellwig on 14 Jun 2010 11:30
On Thu, Jun 10, 2010 at 05:19:53PM +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner(a)redhat.com>
>
> freeze/thaw_bdev are now just trivial wrappers around
> freeze/thaw_super(). Convert all users of the bdev interfaces to use
> the superblock interfaces instead, and remove the bdev interfaces.

This requires exporting get_active_super. Buit if we want to keep suppoting
freezing of unmounted block devices we need to keep the helpers anyway.
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