linux-ext4 - Re: [PATCH 6/6] iomap: add a page

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Date:   Wed, 6 Jun 2018 13:37:22 +0200
From:   Andreas Gruenbacher <agruenba@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     linux-xfs@...r.kernel.org, Dan Williams <dan.j.williams@...el.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        cluster-devel <cluster-devel@...hat.com>,
        linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 6/6] iomap: add a page_done callback

On 6 June 2018 at 12:40, Christoph Hellwig <hch@....de> wrote:
> This will be used by gfs2 to attach data to transactions for the journaled
> data mode.  But the concept is generic enough that we might be able to
> use it for other purposes like encryption/integrity post-processing in the
> future.
>
> Based on a patch from Andreas Gruenbacher.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  fs/iomap.c            | 3 +++
>  include/linux/iomap.h | 8 ++++++++
>  2 files changed, 11 insertions(+)
>
> diff --git a/fs/iomap.c b/fs/iomap.c
> index f2a491b98b7c..a7ecdd5ddd17 100644
> --- a/fs/iomap.c
> +++ b/fs/iomap.c
> @@ -201,6 +201,9 @@ iomap_write_end(struct inode *inode, loff_t pos, unsigned len,
>                                 copied, page, NULL);
>         }
>
> +       if (iomap->page_done)
> +               iomap->page_done(inode, pos, copied, page, iomap);
> +
>         if (ret < len)
>                 iomap_write_failed(inode, pos, len);
>         return ret;
> diff --git a/include/linux/iomap.h b/include/linux/iomap.h
> index 69ef622f650e..474e2255ac6e 100644
> --- a/include/linux/iomap.h
> +++ b/include/linux/iomap.h
> @@ -58,6 +58,14 @@ struct iomap {
>                 struct dax_device   *dax_dev;
>                 void                *inline_data;
>         };
> +
> +       /*
> +        * Called when finished processing a page in the mapping returned in
> +        * thus iomap.  At least for now this is only supported in the buffered

"thus" -> "this"

> +        * write path.
> +        */
> +       void (*page_done)(struct inode *inode, loff_t pos, unsigned copied,
> +                       struct page *page, struct iomap *iomap);
>  };
>
>  /*
> --
> 2.14.2
>

Andreas