[Qemu-devel] [PATCH 4/5] qmp: add the GUEST_MEDIUM_EJECTED event

[Luiz Capitulino <lcapitulino@redhat.com>]

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 QMP/qmp-events.txt |   21 +++++++++++++++++++++
 block.c            |   15 +++++++++++++++
 monitor.c          |    3 +++
 monitor.h          |    1 +
 4 files changed, 40 insertions(+), 0 deletions(-)

diff --git a/QMP/qmp-events.txt b/QMP/qmp-events.txt
index 06cb404..ab32e62 100644
--- a/QMP/qmp-events.txt
+++ b/QMP/qmp-events.txt
@@ -26,6 +26,27 @@ Example:
 Note: If action is "stop", a STOP event will eventually follow the
 BLOCK_IO_ERROR event.
 
+GUEST_MEDIUM_EJECTED
+--------------------
+
+Emitted when the guest succeeds ejecting a removable medium. If the drive
+has a tray, this is only emitted if the tray opens or closes.
+
+Data:
+
+- "device": device name (json-string)
+- "ejected": true if the tray has been opened or false if it has been closed
+
+Example:
+
+{ "event": "GUEST_MEDIUM_EJECTED",
+    "data": { "device": "ide1-cd1",
+              "ejected": true },
+    "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }
+
+Note: This event does not track all tray changes, as QMP/HMP commands like
+'eject' can also change the tray.
+
 RESET
 -----
 
diff --git a/block.c b/block.c
index 77ace49..7f5b56d 100644
--- a/block.c
+++ b/block.c
@@ -2244,6 +2244,17 @@ int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
     return data.ret;
 }
 
+static void bdrv_emit_qmp_eject_event(BlockDriverState *bs, bool is_ejected)
+{
+    QObject *data;
+
+    data = qobject_from_jsonf("{ 'device': %s, 'ejected': %i }",
+                              bdrv_get_device_name(bs), is_ejected);
+    monitor_protocol_event(QEVENT_GUEST_MEDIUM_EJECTED, data);
+
+    qobject_decref(data);
+}
+
 void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv,
                                BlockQMPEventAction action, int is_read)
 {
@@ -3567,6 +3578,10 @@ 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 && bs->device_name[0]) {
+        bdrv_emit_qmp_eject_event(bs, eject_flag);
+    }
 }
 
 /**
diff --git a/monitor.c b/monitor.c
index aadbdcb..48b1dea 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_GUEST_MEDIUM_EJECTED:
+            event_name = "GUEST_MEDIUM_EJECTED";
+            break;
         default:
             abort();
             break;
diff --git a/monitor.h b/monitor.h
index b72ea07..06be7bb 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_GUEST_MEDIUM_EJECTED,
     QEVENT_MAX,
 } MonitorEvent;
 
-- 
1.7.9.111.gf3fb0.dirty