[PATCH 3/9] qapi/block: Add BLOCK_IO_DELAY event

[Hanna Czenczek <hreitz@redhat.com>]

This event will be emitted when a disk operation takes longer than a
pre-defined threshold (as set on the block device).

Signed-off-by: Hanna Czenczek <hreitz@redhat.com>
---
 qapi/block.json | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/qapi/block.json b/qapi/block.json
index 456118eb0b4..1cdaffd5520 100644
--- a/qapi/block.json
+++ b/qapi/block.json
@@ -625,3 +625,33 @@
 ##
 { 'enum': 'IoAccountingOperation',
   'data': [ 'read', 'write', 'flush', 'zone-append', 'unmap' ] }
+
+##
+# @BLOCK_IO_DELAY:
+#
+# Emitted when a disk operation takes longer than the pre-defined
+# threshold (as set via the delay-alert-ms property on the block
+# device).
+#
+# Note that delays deliberately incurred by throttling do count
+# towards the operation duration.
+#
+# @qom-path: path to the device object in the QOM tree
+#
+# @operation: I/O operation
+#
+# @duration: Ongoing duration of the operation (in seconds)
+#
+# @offset: Request offset in the guest disk (in bytes), if available
+#
+# @bytes: Request length
+#
+# Since: 11.2
+##
+{ 'event': 'BLOCK_IO_DELAY',
+  'data': {
+      'qom-path': 'str',
+      'operation': 'IoAccountingOperation',
+      'duration': 'number',
+      '*offset': 'uint64',
+      'bytes': 'uint64' } }
-- 
2.55.0