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Re: [Qemu-block] [PATCH 6/9] file-posix: Forbid trying to change unsuppo
From: |
Max Reitz |
Subject: |
Re: [Qemu-block] [PATCH 6/9] file-posix: Forbid trying to change unsupported options during reopen |
Date: |
Wed, 29 Aug 2018 14:59:59 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 |
On 2018-08-29 14:33, Alberto Garcia wrote:
> On Wed 29 Aug 2018 01:33:13 PM CEST, Max Reitz wrote:
>> On 2018-08-26 16:09, Alberto Garcia wrote:
>>> The file-posix code is used for the "file", "host_device" and
>>> "host_cdrom" drivers, and it allows reopening images. However the only
>>> option that is actually processed is "x-check-cache-dropped", and
>>> changes in all other options (e.g. "filename") are silently ignored:
>>>
>>> (qemu) qemu-io virtio0 "reopen -o file.filename=no-such-file"
>>>
>>> While we could allow changing some of the other options, let's keep
>>> things as they are for now but return an error if the user tries to
>>> change any of them.
>>>
>>> Signed-off-by: Alberto Garcia <address@hidden>
>>> ---
>>> block/file-posix.c | 9 +++++++--
>>> 1 file changed, 7 insertions(+), 2 deletions(-)
>>
>> Looks OK, but the same question from the last patch arises. If
>> unspecified options mean using the default, shouldn't the user have to
>> re-specify all mandatory options, so at least @filename in this case?
>
> This is the old (existing) reopen command, which takes the current
> options and applies the user-specified changes on top. In this one we
> can leave options out because the old values are kept.
>
> It's in the new QMP blockdev-reopen command (not in this series yet)
> that you need to specify all options (among other things because it
> takes a BlockdevOptions struct, so there's no choice not to specify the
> mandatory ones).
Hmm... OK. I thought we'd just change the current reopen command. But
that's OK, then.
Max
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