linux-kernel - Re: [PATCH AUTOSEL 5.7 244/274] xfs: force writes to delalloc regions to unwritten

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Message-ID: <20200609042758.GQ1334206@magnolia>
Date:   Mon, 8 Jun 2020 21:27:58 -0700
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Christoph Hellwig <hch@....de>,
        Brian Foster <bfoster@...hat.com>, linux-xfs@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.7 244/274] xfs: force writes to delalloc
 regions to unwritten

On Mon, Jun 08, 2020 at 10:10:21PM -0400, Sasha Levin wrote:
> On Mon, Jun 08, 2020 at 06:07:27PM -0700, Darrick J. Wong wrote:
> > On Mon, Jun 08, 2020 at 07:05:37PM -0400, Sasha Levin wrote:
> > > From: "Darrick J. Wong" <darrick.wong@...cle.com>
> > > 
> > > [ Upstream commit a5949d3faedf492fa7863b914da408047ab46eb0 ]
> > > 
> > > When writing to a delalloc region in the data fork, commit the new
> > > allocations (of the da reservation) as unwritten so that the mappings
> > > are only marked written once writeback completes successfully.  This
> > > fixes the problem of stale data exposure if the system goes down during
> > > targeted writeback of a specific region of a file, as tested by
> > > generic/042.
> > > 
> > > Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
> > > Reviewed-by: Christoph Hellwig <hch@....de>
> > > Reviewed-by: Brian Foster <bfoster@...hat.com>
> > > Signed-off-by: Sasha Levin <sashal@...nel.org>
> > 
> > Err, this doesn't have a Fixes: tag attached to it.  Does it pass
> > fstests?  Because it doesn't look like you've pulled in "xfs: don't fail
> > unwritten extent conversion on writeback due to edquot", which is needed
> > to avoid regressing fstests...
> > 
> > ...waitaminute, that whole series lacks Fixes: tags because it wasn't
> > considered a good enough candidate for automatic backport.
> 
> AUTOSEL doesn't look just at the Fixes tag :)
> 
> > Ummm, does the autosel fstests driver turn on quotas? ;)
> 
> Uh, apparently not :/ Is it okay to just enable it across all tests?

It should be at this point.

> While I go fix that up, would you rather drop the series, or pick up
> 1edd2c055dff ("xfs: don't fail unwritten extent conversion on writeback
> due to edquot")?`

Let's drop it for now, please.  There might be a few more tweaks needed
to get that bit just right.

--D

> -- 
> Thanks,
> Sasha