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Date: Fri, 11 Aug 2017 03:02:30 -0700
From: Christoph Hellwig <hch@infradead.org>
To: "Darrick J. Wong" <darrick.wong@oracle.com>
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Subject: Re: [PATCH] vfs: freeze filesystems just prior to reboot
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On Sat, Aug 05, 2017 at 08:45:28AM -0700, Darrick J. Wong wrote:
> FSCHECKPOINT?  Since that's your requirement anyway...
> 
> "Ensures that all filesystem metadata (which may be in a journal
> somewhere) has been checkpointed back to disk." ?

What about a file system that is entirely log structured and just
garbage collects some times?