linux-kernel - Re: [RFC v2 6/6] fs: add automatic kernel fs freeze / thaw and remove kthread freezing

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Message-ID: <20210420184703.GN4332@42.do-not-panic.com>
Date:   Tue, 20 Apr 2021 18:47:03 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     rafael@...nel.org, gregkh@...uxfoundation.org,
        viro@...iv.linux.org.uk, jack@...e.cz, bvanassche@....org,
        jeyu@...nel.org, ebiederm@...ssion.com, mchehab@...nel.org,
        keescook@...omium.org, linux-fsdevel@...r.kernel.org,
        kernel@...force.de, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC v2 6/6] fs: add automatic kernel fs freeze / thaw and
 remove kthread freezing

On Tue, Apr 20, 2021 at 01:59:03PM +0100, Christoph Hellwig wrote:
> > This also removes all the superflous freezer calls on all filesystems
> > as they are no longer needed as the VFS now performs filesystem
> > freezing/thaw if the filesystem has support for it. The filesystem
> > therefore is in charge of properly dealing with quiescing of the
> > filesystem through its callbacks.
> 
> Can you split that out from the main logic change?  Maybe even into one
> patch per file system?

The issue with this is that once you do the changes in pm to
freeze/suspend, if you leave the other changes in for the filesystems
freeze / resume will stall, so all this needs to be an atomic operation
if we want bisectable kernels.

  Luis