[Qemu-devel] [PATCH 7/8] qmp: add query-block-jobs

[Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>]

Add query-block-jobs, which shows the progress of ongoing block device
operations.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
---
 blockdev.c      |   46 ++++++++++++++++++++++++++++++++++++++++++++++
 blockdev.h      |    2 ++
 monitor.c       |   16 ++++++++++++++++
 qmp-commands.hx |   32 ++++++++++++++++++++++++++++++++
 4 files changed, 96 insertions(+), 0 deletions(-)

diff --git a/blockdev.c b/blockdev.c
index 5ad7d3b..6d78597 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -919,3 +919,49 @@ int do_block_job_cancel(Monitor *mon, const QDict *params,
     block_job_cancel(job, do_block_job_cancel_cb, cancel_data);
     return 0;
 }
+
+static void monitor_print_block_jobs_one(QObject *info, void *opaque)
+{
+    QDict *stream = qobject_to_qdict(info);
+    Monitor *mon = opaque;
+
+    /* TODO libvirt searches for "Streaming device" but this might be a
+     * non-stream job */
+    monitor_printf(mon, "Streaming device %s: Completed %" PRId64 " of %"
+                   PRId64 " bytes, speed limit %" PRId64 " bytes/s\n",
+                   qdict_get_str(stream, "device"),
+                   qdict_get_int(stream, "offset"),
+                   qdict_get_int(stream, "len"),
+                   qdict_get_int(stream, "speed"));
+}
+
+void monitor_print_block_jobs(Monitor *mon, const QObject *data)
+{
+    QList *list = qobject_to_qlist(data);
+
+    assert(list);
+
+    if (qlist_empty(list)) {
+        monitor_printf(mon, "No active jobs\n");
+        return;
+    }
+
+    qlist_iter(list, monitor_print_block_jobs_one, mon);
+}
+
+static void do_info_block_jobs_one(void *opaque, BlockDriverState *bs)
+{
+    QList *list = opaque;
+    BlockJob *job = bs->job;
+
+    if (job) {
+        qlist_append_obj(list, qobject_from_block_job(job));
+    }
+}
+
+void do_info_block_jobs(Monitor *mon, QObject **ret_data)
+{
+    QList *list = qlist_new();
+    bdrv_iterate(do_info_block_jobs_one, list);
+    *ret_data = QOBJECT(list);
+}
diff --git a/blockdev.h b/blockdev.h
index 7d3db30..9bfc33d 100644
--- a/blockdev.h
+++ b/blockdev.h
@@ -71,5 +71,7 @@ int do_block_job_set_speed(Monitor *mon, const QDict *qdict,
                            QObject **ret_data);
 int do_block_job_cancel(Monitor *mon, const QDict *params,
                         MonitorCompletion *cb, void *opaque);
+void monitor_print_block_jobs(Monitor *mon, const QObject *data);
+void do_info_block_jobs(Monitor *mon, QObject **ret_data);
 
 #endif
diff --git a/monitor.c b/monitor.c
index 38addcf..ad878af 100644
--- a/monitor.c
+++ b/monitor.c
@@ -2786,6 +2786,14 @@ static const mon_cmd_t info_cmds[] = {
         .mhandler.info_new = bdrv_info_stats,
     },
     {
+        .name       = "block-jobs",
+        .args_type  = "",
+        .params     = "",
+        .help       = "show progress of ongoing block device operations",
+        .user_print = monitor_print_block_jobs,
+        .mhandler.info_new = do_info_block_jobs,
+    },
+    {
         .name       = "registers",
         .args_type  = "",
         .params     = "",
@@ -3080,6 +3088,14 @@ static const mon_cmd_t qmp_query_cmds[] = {
         .mhandler.info_new = bdrv_info_stats,
     },
     {
+        .name       = "block-jobs",
+        .args_type  = "",
+        .params     = "",
+        .help       = "show progress of ongoing block device operations",
+        .user_print = monitor_print_block_jobs,
+        .mhandler.info_new = do_info_block_jobs,
+    },
+    {
         .name       = "cpus",
         .args_type  = "",
         .params     = "",
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 741c2f8..6e8207b 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -2089,3 +2089,35 @@ Example:
 
 EQMP
 
+SQMP
+
+query-block-jobs
+----------------
+
+Show progress of ongoing block device operations.
+
+Return a json-array of all block device operations.  If no operation is active
+then return an empty array.  Each operation is a json-object with the following
+data:
+
+- type:     job type ("stream" for image streaming, json-string)
+- device:   device name (json-string)
+- len:      maximum progress value (json-int)
+- offset:   current progress value (json-int)
+- speed:    rate limit, bytes per second (json-int)
+
+Progress can be observed as offset increases and it reaches len when the
+operation completes.  Offset and len have undefined units but can be used to
+calculate a percentage indicating the progress that has been made.
+
+Example:
+
+-> { "execute": "query-block-jobs" }
+<- { "return":[
+      { "type": "stream", "device": "virtio0",
+        "len": 10737418240, "offset": 709632,
+        "speed": 0 }
+   ]
+ }
+
+EQMP
-- 
1.7.7