block_job_error_action() needs to know if reading from the top node or
writing to the base node failed so that it can set the right 'operation'
in the BLOCK_JOB_ERROR QMP event.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20200214200812.28180-6-kwolf@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/commit.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/block/commit.c b/block/commit.c
index 2992a1012f..8e672799af 100644
--- a/block/commit.c
+++ b/block/commit.c
@@ -143,6 +143,7 @@ static int coroutine_fn commit_run(Job *job, Error **errp)
 
     for (offset = 0; offset < len; offset += n) {
         bool copy;
+        bool error_in_source = true;
 
         /* Note that even when no rate limit is applied we need to yield
          * with no pending I/O here so that bdrv_drain_all() returns.
@@ -162,11 +163,15 @@ static int coroutine_fn commit_run(Job *job, Error **errp)
             ret = blk_co_pread(s->top, offset, n, buf, 0);
             if (ret >= 0) {
                 ret = blk_co_pwrite(s->base, offset, n, buf, 0);
+                if (ret < 0) {
+                    error_in_source = false;
+                }
             }
         }
         if (ret < 0) {
             BlockErrorAction action =
-                block_job_error_action(&s->common, s->on_error, false, -ret);
+                block_job_error_action(&s->common, s->on_error,
+                                       error_in_source, -ret);
             if (action == BLOCK_ERROR_ACTION_REPORT) {
                 goto out;
             } else {
-- 
2.20.1