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qmp: Add optional bool "unmap" to drive-mirror

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If specified as "true", it allows discarding on target sectors where source is
not allocated.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Fam Zheng 2015-06-08 13:56:08 +08:00 • committed by Stefan Hajnoczi
parent ba3f0e2545
commit 0fc9f8ea28
6 changed files with 24 additions and 4 deletions
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3
qmp-commands.hx
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@ -1503,6 +1503,7 @@ EQMP
.args_type = "sync:s,device:B,target:s,speed:i?,mode:s?,format:s?,"
"node-name:s?,replaces:s?,"
"on-source-error:s?,on-target-error:s?,"
"unmap:b?,"
"granularity:i?,buf-size:i?",
.mhandler.cmd_new = qmp_marshal_input_drive_mirror,
},
@ -1542,6 +1543,8 @@ Arguments:
(BlockdevOnError, default 'report')
- "on-target-error": the action to take on an error on the target
(BlockdevOnError, default 'report')
- "unmap": whether the target sectors should be discarded where source has only
zeroes. (json-bool, optional, default true)
The default value of the granularity is the image cluster size clamped
between 4096 and 65536, if the image format defines one. If the format