[Qemu-devel] [PATCH 4/4] qmp: add BLOCK_MEDIUM_EJECT event

[Luiz Capitulino <lcapitulino@redhat.com>]

It's emitted whenever the tray is moved by the guest or by HMP/QMP
commands.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 QMP/qmp-events.txt |   17 +++++++++++++++++
 block.c            |   24 ++++++++++++++++++++++++
 monitor.c          |    3 +++
 monitor.h          |    1 +
 4 files changed, 45 insertions(+), 0 deletions(-)

diff --git a/QMP/qmp-events.txt b/QMP/qmp-events.txt
index 06cb404..c52e7fe 100644
--- a/QMP/qmp-events.txt
+++ b/QMP/qmp-events.txt
@@ -26,6 +26,23 @@ Example:
 Note: If action is "stop", a STOP event will eventually follow the
 BLOCK_IO_ERROR event.
 
+BLOCK_MEDIUM_EJECT
+------------------
+
+It's emitted whenever the tray is moved by the guest or by HMP/QMP
+commands.
+
+Data:
+
+- "device": device name (json-string)
+- "ejected": true if the tray has been opened or false if it has been closed
+
+{ "event": "BLOCK_MEDIUM_EJECT",
+  "data": { "device": "ide1-cd0",
+            "ejected": true
+  },
+  "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }
+
 RESET
 -----
 
diff --git a/block.c b/block.c
index 47f1823..e5e2a5f 100644
--- a/block.c
+++ b/block.c
@@ -970,10 +970,30 @@ void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv,
     qobject_decref(data);
 }
 
+static void bdrv_emit_qmp_eject_event(BlockDriverState *bs, bool ejected)
+{
+    QObject *data;
+
+    data = qobject_from_jsonf("{ 'device': %s, 'ejected': %i }",
+                              bdrv_get_device_name(bs), ejected);
+    monitor_protocol_event(QEVENT_BLOCK_MEDIUM_EJECT, data);
+
+    qobject_decref(data);
+}
+
 static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load)
 {
     if (bs->dev_ops && bs->dev_ops->change_media_cb) {
+        bool tray_was_closed = !bdrv_dev_is_tray_open(bs);
         bs->dev_ops->change_media_cb(bs->dev_opaque, load);
+        if (tray_was_closed) {
+            /* tray open */
+            bdrv_emit_qmp_eject_event(bs, true);
+        }
+        if (load) {
+            /* tray close */
+            bdrv_emit_qmp_eject_event(bs, false);
+        }
     }
 }
 
@@ -3567,6 +3587,10 @@ void bdrv_eject(BlockDriverState *bs, bool eject_flag, bool tray_changed)
     if (drv && drv->bdrv_eject) {
         drv->bdrv_eject(bs, eject_flag);
     }
+
+    if (tray_changed) {
+        bdrv_emit_qmp_eject_event(bs, eject_flag);
+    }
 }
 
 /**
diff --git a/monitor.c b/monitor.c
index aadbdcb..1758f03 100644
--- a/monitor.c
+++ b/monitor.c
@@ -485,6 +485,9 @@ void monitor_protocol_event(MonitorEvent event, QObject *data)
         case QEVENT_BLOCK_JOB_CANCELLED:
             event_name = "BLOCK_JOB_CANCELLED";
             break;
+        case QEVENT_BLOCK_MEDIUM_EJECT:
+             event_name = "BLOCK_MEDIUM_EJECT";
+            break;
         default:
             abort();
             break;
diff --git a/monitor.h b/monitor.h
index b72ea07..a2555e5 100644
--- a/monitor.h
+++ b/monitor.h
@@ -38,6 +38,7 @@ typedef enum MonitorEvent {
     QEVENT_SPICE_DISCONNECTED,
     QEVENT_BLOCK_JOB_COMPLETED,
     QEVENT_BLOCK_JOB_CANCELLED,
+    QEVENT_BLOCK_MEDIUM_EJECT,
     QEVENT_MAX,
 } MonitorEvent;
 
-- 
1.7.9.111.gf3fb0.dirty