[Cluster-devel] [PATCH v6 5/9] iomap: Add write_end iomap operation

[Christoph Hellwig <hch@lst.de>]

On Sat, Jun 02, 2018 at 11:57:13AM +0200, Andreas Gruenbacher wrote:
> Add a write_end operation to struct iomap_ops to provide a way of
> overriding the default behavior of iomap_write_end.  This will be used
> for implementing data journaling in gfs2: in the data journaling case,
> pages are written into the journal before being written back to their
> proper on-disk locations.

Please names this page_write_end and make it an optional callout
just for the additional functionality, that is keep the call to
iomap_write_end hardcoded in iomap.c, just call the new method before
it.

> +
> +struct iomap_write_args {
> +	const struct iomap_ops *ops;
> +	struct iov_iter *iter;
> +};

Also I wonder if we should just pass the iomap_ops diretly to the actor
callback.