15 May
2013
15 May
'13
noon
On 05/14/2013 02:44 PM, Osier Yang wrote:
QEMU introduced "discard" option for drive since commit a9384aff53,
<...> @var{discard} is one of "ignore" (or "off") or "unmap" (or "on") and controls whether @dfn{discard} (also known as @dfn{trim} or @dfn{unmap}) requests are ignored or passed to the filesystem. Some machine types may not support discard requests. </...>
This patch exposes the support in libvirt.
QEMU supported "discard" for "-drive" since v1.5.0-rc0:
% git tag --contains a9384aff53 contains v1.5.0-rc0 v1.5.0-rc1
So this only detects the capability bit using virQEMUCapsProbeQMPCommandLine.
ACK, Martin