linux-kernel - Re: [PATCH 10/12] iomap: warn on inline maps in iomap_writepage

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Date:   Wed, 16 Oct 2019 09:08:28 +1100
From:   Dave Chinner <david@...morbit.com>
To:     Christoph Hellwig <hch@....de>
Cc:     "Darrick J . Wong" <darrick.wong@...cle.com>,
        Damien Le Moal <Damien.LeMoal@....com>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/12] iomap: warn on inline maps in iomap_writepage_map

On Tue, Oct 15, 2019 at 05:43:43PM +0200, Christoph Hellwig wrote:
> And inline mapping should never mark the page dirty and thus never end up
> in writepages.  Add a check for that condition and warn if it happens.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>
> Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
> ---
>  fs/iomap/buffered-io.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
> index 00af08006cd3..76e72576f307 100644
> --- a/fs/iomap/buffered-io.c
> +++ b/fs/iomap/buffered-io.c
> @@ -1421,6 +1421,8 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc,
>  		error = wpc->ops->map_blocks(wpc, inode, file_offset);
>  		if (error)
>  			break;
> +		if (WARN_ON_ONCE(wpc->iomap.type == IOMAP_INLINE))
> +			continue;
>  		if (wpc->iomap.type == IOMAP_HOLE)
>  			continue;
>  		iomap_add_to_ioend(inode, file_offset, page, iop, wpc, wbc,

looks fine.

Reviewed-by: Dave Chinner <dchinner@...hat.com>
-- 
Dave Chinner
david@...morbit.com