linux-kernel - Re: [dm-devel] [PATCH 0/6] dax poison recovery with RWF_RECOVERY

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Message-ID: <YYOYCMqc5kOoRvcE@infradead.org>
Date:   Thu, 4 Nov 2021 01:21:28 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Jane Chu <jane.chu@...cle.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        "Darrick J. Wong" <djwong@...nel.org>,
        "david@...morbit.com" <david@...morbit.com>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "vishal.l.verma@...el.com" <vishal.l.verma@...el.com>,
        "dave.jiang@...el.com" <dave.jiang@...el.com>,
        "agk@...hat.com" <agk@...hat.com>,
        "snitzer@...hat.com" <snitzer@...hat.com>,
        "dm-devel@...hat.com" <dm-devel@...hat.com>,
        "ira.weiny@...el.com" <ira.weiny@...el.com>,
        "willy@...radead.org" <willy@...radead.org>,
        "vgoyal@...hat.com" <vgoyal@...hat.com>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "nvdimm@...ts.linux.dev" <nvdimm@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-xfs@...r.kernel.org" <linux-xfs@...r.kernel.org>
Subject: Re: [dm-devel] [PATCH 0/6] dax poison recovery with
 RWF_RECOVERY_DATA flag

On Wed, Nov 03, 2021 at 06:09:57PM +0000, Jane Chu wrote:
> This is clearer, I've looked at your 'dax-devirtualize' patch which 
> removes pmem_copy_to/from_iter, and as you mentioned before,
> a separate API for poison-clearing is needed. So how about I go ahead
> rebase my earlier patch
>  
> https://lore.kernel.org/lkml/20210914233132.3680546-2-jane.chu@oracle.com/
> on 'dax-devirtualize', provide dm support for clear-poison?
> That way, the non-dax 99% of the pwrite use-cases aren't impacted at all
> and we resolve the urgent pmem poison-clearing issue?

FYI, I really do like the in-kernel interface in that series.  And
now that we discussed all the effects I also think that automatically
doing the clear on EIO is a good idea.

I'll go back to the series and will reply with a few nitpicks.