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Re: [Qemu-devel] [PATCH v4 5/6] qemu-io: Add 'open -u' to set BDRV_O_UNM

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH v4 5/6] qemu-io: Add 'open -u' to set BDRV_O_UNMAP after the fact
Date: Fri, 6 May 2016 11:01:55 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0

On 05/06/2016 10:21 AM, Eric Blake wrote:
> On 05/06/2016 10:08 AM, Max Reitz wrote:
>> On 05.05.2016 05:42, Eric Blake wrote:
>>> When opening a file from the command line, qemu-io defaults
>>> to BDRV_O_UNMAP but allows -d to give full control to disable
>>> unmaps. But when opening via the 'open' command, qemu-io did
>>> not set BDRV_O_UNMAP, and had no way to allow it.
>>> Make it at least possible to symmetrically test things:
>>> 'qemu-io -d ignore' at the CLI now matches 'qemu-io> open'
>>> in batch mode, and 'qemu-io' or 'qemu-io -d unmap' at
>>> the CLI matches 'qemu-io> open -u'.
>>> Signed-off-by: Eric Blake <address@hidden>
>>> ---
>>>  qemu-io.c | 8 ++++++--
>>>  1 file changed, 6 insertions(+), 2 deletions(-)
>> Not sure why you didn't just reuse the -d option for qemu-io itself, but:
> -d=string is different than -u (as a binary flag).  But you have a
> point, that being able to fully-specify ALL modes, rather than just
> turning on a single mode, is more flexible. I'll see how tough it is to
> fix for v5.

And it looks like supporting it in 'reopen' would also make sense.

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

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