Re: [PATCH v6 00/15] block: fix the zone write granularity and the zone append limit

[Niklas Cassel <cassel@kernel.org>]

On Tue, Oct 27, 2026 at 04:41:14PM -0400, Stefan Hajnoczi wrote:
> On Mon, Sep 21, 2026 at 04:28:02PM +0200, Niklas Cassel wrote:
> > Hello Stefan, Kevin, and everyone else,
> > 
> > This series fixes how QEMU reports and enforces the two constraints that a
> > zoned device places on a write to a sequential zone: the write granularity,
> > and the largest zone append that it accepts. It also fixes two bugs in the
> > zone append emulation in file-posix, one of which a guest can reach.
> > 
> > Most of it is preparation for Sam Li's zoned qcow2 series. The first two
> > patches are taken directly from there, as they are unrelated to qcow2.
> > 
> > Changes since v5:
> > -Picked up Stefan's Reviewed-by tags that he gave when reviewing v4.
> >  Patches that have changed significantly since v4 have had tags dropped
> >  (i.e. they will have neither Damien's nor Stefan's Reviewed-by tags).
> > 
> > Niklas Cassel (13):
> >   block: add a helper for the index of the zone an offset falls in
> >   block: add a helper to check if a zone is conventional
> >   hw/block: derive the zone write granularity from the block sizes
> >   virtio-blk: check the write granularity of writes to sequential zones
> >   hw/block: reject a zoned device that the block sizes cannot address
> >   block: reject zone appends that are not a multiple of the sector size
> >   block: reject a zone append that is larger than a zone
> >   file-posix: remove the zone append write granularity check
> >   virtio-blk: add a max-append-sectors property
> >   block: remove BlockLimits.max_append_sectors
> >   file-posix: reject a zone append past the device capacity
> >   file-posix: reject a zone append to a full or conventional zone
> >   block: do not use CoroutineIOCompletion to hold a return value
> > 
> > Sam Li (2):
> >   block: widen BlockLimits.zone_size to uint64_t
> >   virtio-blk: do not merge requests across a zone boundary
> > 
> >  block/block-backend.c             |  11 +++
> >  block/file-posix.c                |  59 +++++++-----
> >  block/io.c                        |  79 ++++++++++++----
> >  hw/block/block.c                  |  68 ++++++++++++++
> >  hw/block/virtio-blk.c             | 146 ++++++++++++++++++++++++++----
> >  include/block/block-io.h          |  14 +++
> >  include/block/block_int-common.h  |  19 +++-
> >  include/hw/block/block.h          |  14 +++
> >  include/hw/virtio/virtio-blk.h    |   1 +
> >  include/system/block-backend-io.h |   1 +
> >  10 files changed, 349 insertions(+), 63 deletions(-)
> > 
> > 
> > base-commit: 3b5d71cc3652fa7f5ecc449f05dae3ead2b718d7
> > -- 
> > 2.55.0
> > 
> 
> Thanks, applied to my block tree:
> https://gitlab.com/stefanha/qemu/commits/block

Thank you Stefan!


Kind regards,
Niklas