Re: [PATCH v2] file-posix: fix zone write granularity assignment for zoned block devices

[Niklas Cassel <cassel@kernel.org>]

On Tue, Aug 11, 2026 at 03:32:36PM +0200, Niklas Cassel wrote:
> In the ZBC and ZAC specifications, the requirement is that the write
> granularity matches the physical block size.
> 
> However, in the ZNS specification, the requirement is simply that the
> write granularity matches the logical block size.
> 
> See:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a805a4fa4fa376bbc145762bb8b09caa2fa8af48
> 
> In Linux, there is a zone_write_granularity sysfs property which abstracts
> this away, so let's make use of it.
> 
> Currently, it is theoretically possible that QEMU presents an inflated
> write granularity for NVMe devices where the physical block size is larger
> than the logical block size.
> 
> Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
> Fixes: a3c41f06d5a8 ("file-posix: add tracking of the zone write pointers")
> Signed-off-by: Niklas Cassel <cassel@kernel.org>
> ---

Stefan,

Since you already have another zoned storage fix for file-posix.c queued:
https://gitlab.com/stefanha/qemu/-/commits/block-next

Could you perhaps queue this one as well?


Kind regards,
Niklas