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Re: [Qemu-block] [PATCH 6/9] file-posix: Forbid trying to change unsuppo

From: Alberto Garcia
Subject: Re: [Qemu-block] [PATCH 6/9] file-posix: Forbid trying to change unsupported options during reopen
Date: Wed, 29 Aug 2018 14:33:08 +0200
User-agent: Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1 (i586-pc-linux-gnu)

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).


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