[Qemu-devel] [PATCH v2 2/2] blockjob: use blk_new_pinned in block_job_create

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

child_role job already has .stay_at_node=true, so on bdrv_replace_node
operation these child are unchanged. Make block job blk behave in same
manner, to avoid inconsistent intermediate graph states and workarounds
like in mirror.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 block/mirror.c | 6 +-----
 blockjob.c     | 2 +-
 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/block/mirror.c b/block/mirror.c
index f8bdb5b21b..23443116e4 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -713,12 +713,8 @@ static int mirror_exit_common(Job *job)
                             &error_abort);
     bdrv_replace_node(mirror_top_bs, backing_bs(mirror_top_bs), &error_abort);
 
-    /* We just changed the BDS the job BB refers to (with either or both of the
-     * bdrv_replace_node() calls), so switch the BB back so the cleanup does
-     * the right thing. We don't need any permissions any more now. */
-    blk_remove_bs(bjob->blk);
+    /* We don't need any permissions any more now. */
     blk_set_perm(bjob->blk, 0, BLK_PERM_ALL, &error_abort);
-    blk_insert_bs(bjob->blk, mirror_top_bs, &error_abort);
 
     bs_opaque->job = NULL;
 
diff --git a/blockjob.c b/blockjob.c
index 931d675c0c..f5c8d31491 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -398,7 +398,7 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
         job_id = bdrv_get_device_name(bs);
     }
 
-    blk = blk_new(bdrv_get_aio_context(bs), perm, shared_perm);
+    blk = blk_new_pinned(bdrv_get_aio_context(bs), perm, shared_perm);
     ret = blk_insert_bs(blk, bs, errp);
     if (ret < 0) {
         blk_unref(blk);
-- 
2.18.0