QMP: query-status: Add 'io-status' key

Contains the I/O status for the given device. The key is only present
if the device supports it and the VM is configured to stop on errors.

Please, check the documentation being added in this commit for more
information.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/block.c b/block.c
index 92ec2c3b4e..40621b1acb 100644
--- a/block.c
+++ b/block.c
@@ -1893,6 +1893,12 @@ void bdrv_info_print(Monitor *mon, const QObject *data)
     qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon);
 }
 
+static const char *const io_status_name[BDRV_IOS_MAX] = {
+    [BDRV_IOS_OK] = "ok",
+    [BDRV_IOS_FAILED] = "failed",
+    [BDRV_IOS_ENOSPC] = "nospace",
+};
+
 void bdrv_info(Monitor *mon, QObject **ret_data)
 {
     QList *bs_list;
@@ -1915,6 +1921,12 @@ void bdrv_info(Monitor *mon, QObject **ret_data)
             qdict_put(bs_dict, "tray-open",
                       qbool_from_int(bdrv_dev_is_tray_open(bs)));
         }
+
+        if (bdrv_iostatus_is_enabled(bs)) {
+            qdict_put(bs_dict, "io-status",
+                      qstring_from_str(io_status_name[bs->iostatus]));
+        }
+
         if (bs->drv) {
             QObject *obj;