Re: [PATCH 2/2] nbd/server: Allow users to adjust handshake limit in QMP

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On 11.02.25 00:46, Eric Blake wrote:
On Thu, Feb 06, 2025 at 10:20:09AM +0300, Vladimir Sementsov-Ogievskiy wrote:
---
   qapi/block-export.json         | 10 ++++++++++
   include/block/nbd.h            |  6 +++---

[..]

@@ -52,6 +57,10 @@
   #
   # @addr: Address on which to listen.
   #
+# @handshake-max-secs: Time limit, in seconds, at which a client that
+#     has not completed the negotiation handshake will be disconnected,
+#     or 0 for no limit (since 10.0; default: 10).
+#

Hmm. [not about the series], shouldn't we finally deprecate older interface?

By older interface, you are asking about the QMP command
'nbd-server-start' as compared to struct NbdServerOptions.  But the
struct is not directly present in any QMP commands; rather, it only
appears to be used by qemu-storage-daemon as one of its command line
options that needs to set up an NBD server with a JSON-like syntax
that has less nesting than QMP nbd-server-start.  blockdev-nbd.c has
two functions [nbd_server_start_options(NbdServerOPtions *arg...)  and
qmp_nbd_server_start(args...)] that both unpack their slightly
different forms and pass them as parameters to nbd_server_start() that
is then agnostic to whether the older QMP command or newer q-s-d CLI
option was specified.

It looks like libvirt is still using QMP nbd-server-start.  If we were
to start the deprecation process for qemu 10.0, what would the new
command look like?  What would everyone be required to use by qemu
10.2?


Oh you are right, I was inattentive.

So, probably thing to be deprecated is actually SocketAddressLegacy, which is the only difference.

And why just not move common part of the structures to common base? I'll send a patch with a try.

--
Best regards,
Vladimir



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