On 6 June 2018 at 12:40, Christoph Hellwig <hch@xxxxxx> 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@xxxxxx>
> ---
> 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
