From: Stefan Hajnoczi <stefanha@redhat.com>
To: Sam Li <faithilikerun@gmail.com>
Cc: qemu-devel@nongnu.org, "Michael S. Tsirkin" <mst@redhat.com>,
Hanna Reitz <hreitz@redhat.com>, Kevin Wolf <kwolf@redhat.com>,
cassel@kernel.org, dlemoal@kernel.org, qemu-block@nongnu.org,
dmitry.fomichev@wdc.com, Markus Armbruster <armbru@redhat.com>,
Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>,
Eric Blake <eblake@redhat.com>
Subject: Re: [PATCH v12 3/5] virtio-blk: do not merge writes across a zone boundary
Date: Wed, 24 Jun 2026 15:21:25 -0400 [thread overview]
Message-ID: <20260624192125.GG109308@fedora> (raw)
In-Reply-To: <20260623184830.373232-4-faithilikerun@gmail.com>
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On Tue, Jun 23, 2026 at 08:48:28PM +0200, Sam Li wrote:
> virtio_blk_submit_multireq() fuses adjacent in-zone writes into a
> single request. On a zoned backend, a merged zone append request
> that straddles a zone boundary is rejected by the device because
> each write must stay within a single zone.
>
> Add a bail condition to the merge coalescer: if combining the
> candidate request into the current batch would cross a zone
> boundary, flush the current batch and start a new one.
>
> Signed-off-by: Sam Li <faithilikerun@gmail.com>
> ---
> block/block-backend.c | 11 +++++++++++
> hw/block/virtio-blk.c | 22 +++++++++++++++++++++-
> include/system/block-backend-io.h | 1 +
> 3 files changed, 33 insertions(+), 1 deletion(-)
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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next prev parent reply other threads:[~2026-06-24 19:22 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-23 18:48 [PATCH v12 0/5] Add full zoned storage emulation to the qcow2 driver Sam Li
2026-06-23 18:48 ` [PATCH v12 1/5] docs/qcow2: add the zoned format feature Sam Li
2026-06-23 18:48 ` [PATCH v12 2/5] qcow2: add configurations for zoned format extension Sam Li
2026-06-23 18:48 ` [PATCH v12 3/5] virtio-blk: do not merge writes across a zone boundary Sam Li
2026-06-24 19:21 ` Stefan Hajnoczi [this message]
2026-06-23 18:48 ` [PATCH v12 4/5] qcow2: add zoned emulation capability Sam Li
2026-06-23 18:48 ` [PATCH v12 5/5] iotests: test the zoned format feature for qcow2 file Sam Li
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