[Qemu-devel] [PATCH 7/8] QMP: query-status: Add 'io-status' key

[Luiz Capitulino <lcapitulino@redhat.com>]

Contains the last I/O status for the given device. Currently this is
only supported by ide, scsi and virtio block devices.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 block.c         |   15 ++++++++++++++-
 block.h         |    2 +-
 qmp-commands.hx |    6 ++++++
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/block.c b/block.c
index cc0a34e..28df3d8 100644
--- a/block.c
+++ b/block.c
@@ -1720,6 +1720,12 @@ 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;
@@ -1729,15 +1735,16 @@ void bdrv_info(Monitor *mon, QObject **ret_data)
 
     QTAILQ_FOREACH(bs, &bdrv_states, list) {
         QObject *bs_obj;
+        QDict *bs_dict;
 
         bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': 'unknown', "
                                     "'removable': %i, 'locked': %i }",
                                     bs->device_name, bs->removable,
                                     bs->locked);
+        bs_dict = qobject_to_qdict(bs_obj);
 
         if (bs->drv) {
             QObject *obj;
-            QDict *bs_dict = qobject_to_qdict(bs_obj);
 
             obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
                                      "'encrypted': %i }",
@@ -1752,6 +1759,12 @@ void bdrv_info(Monitor *mon, QObject **ret_data)
 
             qdict_put_obj(bs_dict, "inserted", obj);
         }
+
+        if (bs->iostatus_enabled) {
+            qdict_put(bs_dict, "io-status",
+                      qstring_from_str(io_status_name[bs->iostatus]));
+        }
+
         qlist_append_obj(bs_list, bs_obj);
     }
 
diff --git a/block.h b/block.h
index 0dca1bb..0141fe6 100644
--- a/block.h
+++ b/block.h
@@ -51,7 +51,7 @@ typedef enum {
 } BlockMonEventAction;
 
 typedef enum {
-    BDRV_IOS_OK, BDRV_IOS_FAILED, BDRV_IOS_ENOSPC
+    BDRV_IOS_OK, BDRV_IOS_FAILED, BDRV_IOS_ENOSPC, BDRV_IOS_MAX
 } BlockIOStatus;
 
 void bdrv_iostatus_update(BlockDriverState *bs, int error);
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 6b8eb0a..1746b6d 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -1082,6 +1082,9 @@ Each json-object contain the following:
                                 "tftp", "vdi", "vmdk", "vpc", "vvfat"
          - "backing_file": backing file name (json-string, optional)
          - "encrypted": true if encrypted, false otherwise (json-bool)
+- "io-status": last executed I/O operation status, only present if the device
+               supports it (json_string, optional)
+             - Possible values: "ok", "failed", "nospace"
 
 Example:
 
@@ -1089,6 +1092,7 @@ Example:
 <- {
       "return":[
          {
+            "io-status": "ok",
             "device":"ide0-hd0",
             "locked":false,
             "removable":false,
@@ -1101,12 +1105,14 @@ Example:
             "type":"unknown"
          },
          {
+            "io-status": "ok",
             "device":"ide1-cd0",
             "locked":false,
             "removable":true,
             "type":"unknown"
          },
          {
+            "io-status": "ok",
             "device":"floppy0",
             "locked":false,
             "removable":true,
-- 
1.7.6.131.g99019