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From: Luis Chamberlain <mcgrof@kernel.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: rafael@kernel.org, gregkh@linuxfoundation.org,
	viro@zeniv.linux.org.uk, jack@suse.cz, bvanassche@acm.org,
	jeyu@kernel.org, ebiederm@xmission.com, mchehab@kernel.org,
	keescook@chromium.org, linux-fsdevel@vger.kernel.org,
	kernel@tuxforce.de, kexec@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [RFC v2 6/6] fs: add automatic kernel fs freeze / thaw and remove kthread freezing
Date: Tue, 20 Apr 2021 18:47:03 +0000
Message-ID: <20210420184703.GN4332@42.do-not-panic.com> (raw)
In-Reply-To: <20210420125903.GC3604224@infradead.org>

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

      reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-17  0:10 [RFC v2 0/6] vfs: provide automatic kernel freeze / resume Luis Chamberlain
2021-04-17  0:10 ` [RFC v2 1/6] fs: provide unlocked helper for freeze_super() Luis Chamberlain
2021-04-20 12:03   ` Christoph Hellwig
2021-04-17  0:10 ` [RFC v2 2/6] fs: add frozen sb state helpers Luis Chamberlain
2021-04-17  0:10 ` [RFC v2 3/6] fs: add a helper for thaw_super_locked() which does not unlock Luis Chamberlain
2021-04-17  0:10 ` [RFC v2 4/6] fs: distinguish between user initiated freeze and kernel initiated freeze Luis Chamberlain
2021-04-20 12:46   ` Christoph Hellwig
2021-04-17  0:10 ` [RFC v2 5/6] fs: add iterate_supers_excl() and iterate_supers_reverse_excl() Luis Chamberlain
2021-04-17  0:10 ` [RFC v2 6/6] fs: add automatic kernel fs freeze / thaw and remove kthread freezing Luis Chamberlain
2021-04-20 12:59   ` Christoph Hellwig
2021-04-20 18:47     ` Luis Chamberlain [this message]

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