[Qemu-block] [PATCH v2 12/15] blockjob: Add 'id' parameter to 'block-job-pause'

[Alberto Garcia]

This patch allows the 'block-job-pause' command to identify the
job by either its ID or its device name. The latter becomes now
optional since the ID alone is enough to identify the job.

The HMP 'block_job_pause' command remains unchanged.

Signed-off-by: Alberto Garcia <address@hidden>
Reviewed-by: Max Reitz <address@hidden>
---
 blockdev.c           | 7 +++++--
 hmp.c                | 2 +-
 qapi/block-core.json | 9 +++++++--
 qmp-commands.hx      | 2 +-
 4 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/blockdev.c b/blockdev.c
index 3a0b22a..348eaef 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -3805,10 +3805,13 @@ out:
     aio_context_release(aio_context);
 }
 
-void qmp_block_job_pause(const char *device, Error **errp)
+void qmp_block_job_pause(bool has_id, const char *id,
+                         bool has_device, const char *device, Error **errp)
 {
     AioContext *aio_context;
-    BlockJob *job = find_block_job(NULL, device, &aio_context, errp);
+    BlockJob *job = find_block_job(has_id ? id : NULL,
+                                   has_device ? device : NULL,
+                                   &aio_context, errp);
 
     if (!job || job->user_paused) {
         return;
diff --git a/hmp.c b/hmp.c
index ed5a125..1f04129 100644
--- a/hmp.c
+++ b/hmp.c
@@ -1519,7 +1519,7 @@ void hmp_block_job_pause(Monitor *mon, const QDict *qdict)
     Error *error = NULL;
     const char *device = qdict_get_str(qdict, "device");
 
-    qmp_block_job_pause(device, &error);
+    qmp_block_job_pause(false, NULL, true, device, &error);
 
     hmp_handle_error(mon, &error);
 }
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 38dd3f2..0eaf531 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -1537,14 +1537,19 @@
 # the operation is actually paused.  Cancelling a paused job automatically
 # resumes it.
 #
-# @device: the device name
+# The job must be identified with the @id or @device parameters, but
+# only one of them must be set.
+#
+# @id: #optional the job identifier. (Since 2.7)
+#
+# @device: #optional the device name
 #
 # Returns: Nothing on success
 #          If no background operation is active on this device, DeviceNotActive
 #
 # Since: 1.3
 ##
-{ 'command': 'block-job-pause', 'data': { 'device': 'str' } }
+{ 'command': 'block-job-pause', 'data': { '*id': 'str', '*device': 'str' } }
 
 ##
 # @block-job-resume:
diff --git a/qmp-commands.hx b/qmp-commands.hx
index c7d207a..bd7f749 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -1322,7 +1322,7 @@ EQMP
     },
     {
         .name       = "block-job-pause",
-        .args_type  = "device:B",
+        .args_type  = "id:s?,device:B?",
         .mhandler.cmd_new = qmp_marshal_block_job_pause,
     },
     {
-- 
2.8.1