[libvirt] [PATCH] qemu: don't modify domain on failed blockiotune
Jiri Denemark
jdenemar at redhat.com
Fri May 4 21:52:57 UTC 2012
On Fri, May 04, 2012 at 09:52:44 -0600, Eric Blake wrote:
> If you have a qemu build that lacks the blockio tune monitor command,
> then this command:
>
> $ virsh blkdeviotune rhel6u2 hda --total_bytes_sec 1000
> error: Unable to change block I/O throttle
> error: internal error Unexpected error
>
> fails as expected (well, the error message is lousy), but the next
> dumpxml shows that the domain was modified anyway. Worse, that means
> if you save the domain then restore it, the restore will likely fail
> due to throttling being unsupported, even though no throttling should
> even be active because the monitor command failed in the first place.
>
> * src/qemu/qemu_driver.c (qemuDomainSetBlockIoTune): Check for
> error before making modification permanent.
> ---
> src/qemu/qemu_driver.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
ACK
Jirka
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