[libvirt] [PATCH] Added capability checking for block <iotune> setting.

[Eric Blake]

On 01/18/2012 09:01 AM, Martin Kletzander wrote:
> There was missing capability for blkiotune and thus specifying these
> settings caused libvirt to run qemu with invalid parameters and then
> reporting qemu error instead of the standard libvirt one.
> ---
>  src/qemu/qemu_capabilities.c |    6 ++++++
>  src/qemu/qemu_capabilities.h |    2 ++
>  src/qemu/qemu_command.c      |   13 +++++++++++++
>  tests/qemuxml2argvtest.c     |    2 +-
>  4 files changed, 22 insertions(+), 1 deletions(-)
> 

> @@ -1031,6 +1033,10 @@ qemuCapsComputeCmdFlags(const char *help,
>              qemuCapsSet(flags, QEMU_CAPS_DRIVE_AIO);
>          if (strstr(help, "copy-on-read=on|off"))
>              qemuCapsSet(flags, QEMU_CAPS_DRIVE_COPY_ON_READ);
> +        if (strstr(help, "bps=") && strstr(help, "iops=") &&
> +            strstr(help, "bps_rd=") && strstr(help, "bps_wr=") &&
> +            strstr(help, "iops_rd=") && strstr(help, "iops_wr="))
> +            qemuCapsSet(flags, QEMU_CAPS_DRIVE_IOTUNE);

It should be sufficient to check for just one of these strings, rather
than all 6, since support for all 6 should be added in the same qemu
commit.  Meanwhile, since qemu 1.0 does not support this feature, can
you point to a commit id that will become part of qemu 1.1, and which
actually confirms that this will be in the -help output?

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

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