Re: [RFC PATCH] f2fs: preserve direct write semantics when buffering is forced

[Jaegeuk Kim]

On 03/20, Christoph Hellwig wrote:
> On Mon, Feb 20, 2023 at 01:20:04PM +0100, Hans Holmberg wrote:
> > A) Supporting proper direct writes for zoned block devices would
> > be the best, but it is currently not supported (probably for
> > a good but non-obvious reason). Would it be feasible to
> > implement proper direct IO?
> 
> I don't think why not.  In many ways direct writes to zoned devices
> should be easier than non-direct writes.
> 
> Any comments from the maintainers why the direct I/O writes to zoned
> devices are disabled?  I could not find anything helpful in the comments
> or commit logs.

The direct IO wants to overwrite the data on the same block address, while
zoned device does not support it?