linux-kernel - Re: [RFC PATCH V2] iomap: add support to track dirty state of sub pages

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Message-ID: <20200821061019.GD31091@infradead.org>
Date:   Fri, 21 Aug 2020 07:10:19 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     "Darrick J. Wong" <darrick.wong@...cle.com>,
        Yu Kuai <yukuai3@...wei.com>, hch@...radead.org,
        david@...morbit.com, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        yi.zhang@...wei.com
Subject: Re: [RFC PATCH V2] iomap: add support to track dirty state of sub
 pages

On Tue, Aug 18, 2020 at 05:50:19PM +0100, Matthew Wilcox wrote:
> Looks like Christoph changed his mind sometime between that message
> and the first commit: 9dc55f1389f9569acf9659e58dd836a9c70df217

No, as Darrick pointed out it was all about the header dependency.

> My THP patches convert the bit array to be per-block rather than
> per-sector, so this is all going to go away soon ;-)

I've asked a while ago, but let me repeat:  Can you split out all the
useful iomap bits that are not directly dependent on the new THP
infrastructure and send them out ASAP?  I'd like to pre-load this
work at least a merge window before the actual THP bits.