linux-kernel - Re: [RFC PATCH V4] iomap: add support to track dirty state of sub pages

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Message-ID: <20200821124424.GQ17456@casper.infradead.org>
Date:   Fri, 21 Aug 2020 13:44:24 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Yu Kuai <yukuai3@...wei.com>
Cc:     hch@...radead.org, darrick.wong@...cle.com, 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 V4] iomap: add support to track dirty state of sub
 pages

On Fri, Aug 21, 2020 at 08:33:06PM +0800, Yu Kuai wrote:
> changes from v3:
>  - add IOMAP_STATE_ARRAY_SIZE
>  - replace set_bit / clear_bit with bitmap_set / bitmap_clear
>  - move iomap_set_page_dirty() out of 'iop->state_lock'
>  - merge iomap_set/clear_range_dirty() and iomap_iop_clear/clear_range_dirty()

I'm still working on the iomap parts of the THP series (fixing up
invalidatepage right now), but here are some of the relevant bits (patch
series to follow)