Re: [PATCH 6/6] iotests: vmdk: Enable zeroed_grained=on by default

[Eric Blake <eblake@redhat.com>]

On 4/30/20 8:30 AM, Kevin Wolf wrote:
> In order to avoid bitrot in the zero cluster code in VMDK, enable
> zero_grained=on by default for the tests.

Here, you spell it zero_grained=on,

> 
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> ---
>   tests/qemu-iotests/059   | 6 +++---
>   tests/qemu-iotests/check | 3 +++
>   2 files changed, 6 insertions(+), 3 deletions(-)

So you're changing the default for better coverage and speed, but 
ensuring that 59 still covers the (slower) zero_grained=off.  Seems 
reasonable.

Reviewed-by: Eric Blake <eblake@redhat.com>

> +++ b/tests/qemu-iotests/check
> @@ -546,6 +546,9 @@ fi
>   if [ "$IMGFMT" == "luks" ] && ! (echo "$IMGOPTS" | grep "iter-time=" > /dev/null); then
>       IMGOPTS=$(_optstr_add "$IMGOPTS" "iter-time=10")
>   fi
> +if [ "$IMGFMT" == "vmdk" ] && ! (echo "$IMGOPTS" | grep "zeroed_grain=" > /dev/null); then

Here, zeroed_grain=.  Which is it?

> +    IMGOPTS=$(_optstr_add "$IMGOPTS" "zeroed_grain=on")

As a native speaker, my inclination is zero_grained; but I don't know 
the VMDK spec well enough to know if this is something in the spec, or 
just a term that qemu invented.  And since we already have existing 
usage of one spelling, switching the spelling now would require a 
deprecation period and is separate from this patch.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org