linux-ext4 - Re: [PATCH] vfs: freeze filesystems just prior to reboot

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Message-ID: <20170811100230.GC7064@infradead.org>
Date:   Fri, 11 Aug 2017 03:02:30 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     "Darrick J. Wong" <darrick.wong@...cle.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Colin Walters <walters@...bum.org>,
        xfs <linux-xfs@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] vfs: freeze filesystems just prior to reboot

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?