qapi: copy-on-read filter: add 'bottom' option
Add an option to limit copy-on-read operations to specified sub-chain
of backing-chain, to make copy-on-read filter useful for block-stream
job.
Suggested-by: Max Reitz <mreitz@redhat.com>
Suggested-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
[vsementsov: change subject, modified to freeze the chain,
do some fixes]
Message-Id: <20201216061703.70908-6-vsementsov@virtuozzo.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
diff --git a/qapi/block-core.json b/qapi/block-core.json
index b55732d..65167eb 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -3959,6 +3959,24 @@
'data': { 'throttle-group': 'str',
'file' : 'BlockdevRef'
} }
+
+##
+# @BlockdevOptionsCor:
+#
+# Driver specific block device options for the copy-on-read driver.
+#
+# @bottom: The name of a non-filter node (allocation-bearing layer) that
+# limits the COR operations in the backing chain (inclusive), so
+# that no data below this node will be copied by this filter.
+# If option is absent, the limit is not applied, so that data
+# from all backing layers may be copied.
+#
+# Since: 6.0
+##
+{ 'struct': 'BlockdevOptionsCor',
+ 'base': 'BlockdevOptionsGenericFormat',
+ 'data': { '*bottom': 'str' } }
+
##
# @BlockdevOptions:
#
@@ -4011,7 +4029,7 @@
'bochs': 'BlockdevOptionsGenericFormat',
'cloop': 'BlockdevOptionsGenericFormat',
'compress': 'BlockdevOptionsGenericFormat',
- 'copy-on-read':'BlockdevOptionsGenericFormat',
+ 'copy-on-read':'BlockdevOptionsCor',
'dmg': 'BlockdevOptionsGenericFormat',
'file': 'BlockdevOptionsFile',
'ftp': 'BlockdevOptionsCurlFtp',
