blockjob: expose error string via query

When we've reached the concluded state, we need to expose the error
state if applicable. Add the new field.

This should be sufficient for determining if a job completed
successfully or not after concluding; if we want to discriminate
based on how it failed more mechanically, we can always add an
explicit return code enumeration later.

I didn't bother to make it only show up if we are in the concluded
state; I don't think it's necessary.

Cc: qemu-stable@nongnu.org
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

diff --git a/blockjob.c b/blockjob.c
index dfffad921a13efb421d945a9434b91067ad4245c..0b9b336d1928f07ad2d222c031a42359008264cf 100644 (file)
--- a/blockjob.c
+++ b/blockjob.c
@@ -831,6 +831,8 @@ BlockJobInfo *block_job_query(BlockJob *job, Error **errp)
     info->status    = job->status;
     info->auto_finalize = job->auto_finalize;
     info->auto_dismiss  = job->auto_dismiss;
+    info->has_error = job->ret != 0;
+    info->error     = job->ret ? g_strdup(strerror(-job->ret)) : NULL;
     return info;
 }
 

diff --git a/qapi/block-core.json b/qapi/block-core.json
index 21c3470234a7dc85b989a9e4e4474cdd00353428..17ffd44cce3bf25f99d381815bf80eb4010164e4 100644 (file)
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -1172,6 +1172,9 @@
 # @auto-dismiss: Job will dismiss itself when CONCLUDED, moving to the NULL
 #                state and disappearing from the query list. (since 2.12)
 #
+# @error: Error information if the job did not complete successfully.
+#         Not set if the job completed successfully. (since 2.12.1)
+#
 # Since: 1.1
 ##
 { 'struct': 'BlockJobInfo',
@@ -1179,7 +1182,8 @@
            'offset': 'int', 'busy': 'bool', 'paused': 'bool', 'speed': 'int',
            'io-status': 'BlockDeviceIoStatus', 'ready': 'bool',
            'status': 'BlockJobStatus',
-           'auto-finalize': 'bool', 'auto-dismiss': 'bool' } }
+           'auto-finalize': 'bool', 'auto-dismiss': 'bool',
+           '*error': 'str' } }
 
 ##
 # @query-block-jobs: