hmp: add parameters device and -v for info block

With these parameters, user can choose the information to be showed,
to avoid message flood in the monitor.

Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

2 files changed, 20 insertions, 12 deletions

diff --git a/hmp.c b/hmp.c
index 4fc3bfef74..494a9aa459 100644
--- a/hmp.c
+++ b/hmp.c
@@ -280,10 +280,15 @@ void hmp_info_block(Monitor *mon, const QDict *qdict)
 {
     BlockInfoList *block_list, *info;
     ImageInfo *image_info;
+    const char *device = qdict_get_try_str(qdict, "device");
+    bool verbose = qdict_get_try_bool(qdict, "verbose", 0);
 
     block_list = qmp_query_block(NULL);
 
     for (info = block_list; info; info = info->next) {
+        if (device && strcmp(device, info->value->device)) {
+            continue;
+        }
         monitor_printf(mon, "%s: removable=%d",
                        info->value->device, info->value->removable);
 
@@ -322,15 +327,17 @@ void hmp_info_block(Monitor *mon, const QDict *qdict)
                             info->value->inserted->iops_rd,
                             info->value->inserted->iops_wr);
 
-            monitor_printf(mon, " images:\n");
-            image_info = info->value->inserted->image;
-            while (1) {
-                bdrv_image_info_dump((fprintf_function)monitor_printf, mon,
-                                     image_info);
-                if (image_info->has_backing_image) {
-                    image_info = image_info->backing_image;
-                } else {
-                    break;
+            if (verbose) {
+                monitor_printf(mon, " images:\n");
+                image_info = info->value->inserted->image;
+                while (1) {
+                        bdrv_image_info_dump((fprintf_function)monitor_printf,
+                                             mon, image_info);
+                    if (image_info->has_backing_image) {
+                        image_info = image_info->backing_image;
+                    } else {
+                        break;
+                    }
                 }
             }
         } else {
diff --git a/monitor.c b/monitor.c
index 9d279b81cf..017411fcb0 100644
--- a/monitor.c
+++ b/monitor.c
@@ -2472,9 +2472,10 @@ static mon_cmd_t info_cmds[] = {
     },
     {
         .name       = "block",
-        .args_type  = "",
-        .params     = "",
-        .help       = "show the block devices",
+        .args_type  = "verbose:-v,device:B?",
+        .params     = "[-v] [device]",
+        .help       = "show info of one block device or all block devices "
+                      "(and details of images with -v option)",
         .mhandler.cmd = hmp_info_block,
     },
     {