linux-kernel - Re: [PATCH] f2fs: fix fdatasync

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Date:   Wed, 16 Nov 2016 18:30:04 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, chao@...nel.org
Subject: Re: [PATCH] f2fs: fix fdatasync

Hi Chao,

On Thu, Nov 17, 2016 at 09:13:03AM +0800, Chao Yu wrote:
> On 2016/11/16 20:15, Christoph Hellwig wrote:
> > On Wed, Nov 16, 2016 at 08:12:11PM +0800, Chao Yu wrote:
> >> For below two cases, we can't guarantee data consistence:
> >>
> >> a)
> >> 1. xfs_io "pwrite 0 4195328" "fsync"
> >> 2. xfs_io "pwrite 4195328 1024" "fdatasync"
> >> 3. godown
> >> 4. umount & mount
> >> --> isize we updated before fdatasync won't be recovered
> >>
> >> b)
> >> 1. xfs_io "pwrite -S 0xcc 0 4202496" "fsync"
> >> 2. xfs_io "fpunch 4194304 4096" "fdatasync"
> >> 3. godown
> >> 4. umount & mount
> >> --> dnode we punched before fdatasync won't be recovered
> > 
> > Can you please add testcases for these to xfstests?
> 
> It's OK, will do.

Let me take a look at this for a while.
It seems there are another test cases as well in terms of this issue.

Thanks,

> 
> > 
> > .
> >