[PATCH] nvme: zns: limit max_zone_append by max_segments

[Christoph Hellwig]

On Mon, Jul 31, 2023 at 11:12:43PM +0900, Damien Le Moal wrote:
> max zone append sectors limit indicates the maximum size of a zone append BIO
> that can be built without ever needing splitting.
> 
> So if we fix the zns limit, zonefs does not really need a fix, eventhough the
> code would be a little weird as-is.

You still need to fix splitting due to I/O layout and not just size.

E.g. if your do a writev() with two non-page aligned buffers (you'll
probably need a arm64 or power box to trigger it), you need to split
the bio even if it trivially fits into the size limit.  Similar for
things like max_segment_size.