On 06/07/2015 11:56 PM, Fam Zheng wrote: > If specified as "true", it allows discarding on target sectors where source is > not allocated. > > Signed-off-by: Fam Zheng <f...@redhat.com> > --- > block/mirror.c | 8 ++++++-- > blockdev.c | 5 +++++ > hmp.c | 2 +- > include/block/block_int.h | 2 ++ > qapi/block-core.json | 8 +++++++- > qmp-commands.hx | 3 +++ > 6 files changed, 24 insertions(+), 4 deletions(-) >
> +++ b/qapi/block-core.json > @@ -973,6 +973,11 @@ > # @on-target-error: #optional the action to take on an error on the target, > # default 'report' (no limitations, since this applies to > # a different block device than @device). > +# @unmap: #optional Whether to try to unmap target sectors where source has > +# only zero. If true, and target unallocated sectors will read as > zero, > +# target image sectors will be unmapped; otherwise, zeroes will be > +# written. Both will result in identical contents. > +# Default is true. (Since 2.4) > # Per the other thread on adding 'detect-zeroes', should we instead be using an enum here that describes one of several behaviors without an explosion into multiple knobs? -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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