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Re: [Qemu-devel] [PATCH for-2.9 1/5] rbd: Clean up runtime_opts

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH for-2.9 1/5] rbd: Clean up runtime_opts
Date: Thu, 23 Mar 2017 09:03:37 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0

On 03/23/2017 05:55 AM, Markus Armbruster wrote:
> runtime_opts is used for three different purposes:
> * qemu_rbd_open() uses it to accept options it recognizes, such as
>   "pool" and "image".  Other .bdrv_open() methods do it similarly.
> * qemu_rbd_open() accepts additional list-valued options
>   auth-supported and server, with the help of qemu_rbd_array_opts().
>   The list elements are again dictionaries.  qemu_rbd_array_opts()
>   uses runtime_opts to accept their members.  Thus, runtime_opts
>   contains recognized sub-sub-options "auth", "host", "port" in
>   addition to recognized options.  No other block driver does that.
> * qemu_rbd_create() uses it to converts the QDict produced by


>   qemu_rbd_parse_filename() to QemuOpts.  No other block driver does
>   that.  The keys produced by qemu_rbd_parse_filename() are "pool",
>   "image", "snapshot", "conf", "user" and "keyvalue-pairs".
>   qemu_rbd_open() accepts these, so no additional ones here.
> This is a confusing mess.  Dates back to commit 0f9d252.  First step

That commit is unreleased, so we are still free to improve it before 2.9
is finalized.

> to clean it up is documenting runtime_opts.desc[]:
> * Reorder entries to match the QAPI schema, like we do in other block
>   drivers.
> * Document why the schema's "server" and "auth-supported" aren't in
>   .desc[].
> * Document why "keyvalue-pairs", "host", "port" and "auth" are in
>   .desc[], but not the schema.
> * Delete "filename", because none of the three users actually uses it.
> Signed-off-by: Markus Armbruster <address@hidden>
> ---
>  block/rbd.c | 39 ++++++++++++++++++++++++---------------
>  1 file changed, 24 insertions(+), 15 deletions(-)

Reviewed-by: Eric Blake <address@hidden>

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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