linux-ext4 - Re: [PATCH] iomap: iomap_bmap should accept unwritten maps

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Date:   Tue, 25 Aug 2020 12:21:59 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Yuxuan Shui <yshuiv7@...il.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, tytso@....edu, adilger.kernel@...ger.ca
Subject: Re: [PATCH] iomap: iomap_bmap should accept unwritten maps

On Tue, Aug 25, 2020 at 11:40:34AM +0100, Yuxuan Shui wrote:
> Hi,
> 
> On Tue, Aug 25, 2020 at 11:20 AM Christoph Hellwig <hch@...radead.org> wrote:
> >
> > On Tue, Aug 25, 2020 at 10:26:14AM +0100, Yuxuan Shui wrote:
> > > Hi,
> > >
> > > Do we actually want to fix this bug or not? There are a number of
> > > people actually seeing this bug.
> >
> > bmap should not succeed for unwritten extents.
> 
> Why not? Unwritten extents are still allocated extents.

Because you can't read from or write to them.