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Date: Wed, 24 Nov 2021 08:10:28 +0100 From: Christoph Hellwig <hch@....de> To: Dan Williams <dan.j.williams@...el.com> Cc: Christoph Hellwig <hch@....de>, Mike Snitzer <snitzer@...hat.com>, Ira Weiny <ira.weiny@...el.com>, device-mapper development <dm-devel@...hat.com>, linux-xfs <linux-xfs@...r.kernel.org>, Linux NVDIMM <nvdimm@...ts.linux.dev>, linux-s390 <linux-s390@...r.kernel.org>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, linux-erofs@...ts.ozlabs.org, linux-ext4 <linux-ext4@...r.kernel.org>, virtualization@...ts.linux-foundation.org Subject: Re: [PATCH 22/29] iomap: add a IOMAP_DAX flag On Tue, Nov 23, 2021 at 06:47:10PM -0800, Dan Williams wrote: > On Tue, Nov 9, 2021 at 12:34 AM Christoph Hellwig <hch@....de> wrote: > > > > Add a flag so that the file system can easily detect DAX operations. > > Looks ok, but I would have preferred a quick note about the rationale > here before needing to read other patches to figure that out. The reason is to only apply the DAX partition offsets to actual DAX operations, and not to e.g. fiemap. I'll document that more clearly.
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