blockjob: drop BlockJob.blk field

It's unused now (except for permission handling)[*]. The only reasonable
user of it was block-stream job, recently updated to use own blk. And
other block jobs prefer to use own source node related objects.

So, the arguments of dropping the field are:

 - block jobs prefer not to use it
 - block jobs usually has more then one node to operate on, and better
   to operate symmetrically (for example has both source and target
   blk's in specific block-job state structure)

*: BlockJob.blk is used to keep some permissions. We simply move
permissions to block-job child created in block_job_create() together
with blk.

In mirror, we just should not care anymore about restoring state of
blk. Most probably this code could be dropped long ago, after dropping
bs->job pointer. Now it finally goes away together with BlockJob.blk
itself.

iotest 141 output is updated, as "bdrv_has_blk(bs)" check in
qmp_blockdev_del() doesn't fail (we don't have blk now). Still, new
error message looks even better.

In iotest 283 we need to add a job id, otherwise "Invalid job ID"
happens now earlier than permission check (as permissions moved from
blk to block-job node).

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Nikita Lapshin <nikita.lapshin@virtuozzo.com>

1 files changed, 0 insertions, 7 deletions

diff --git a/block/mirror.c b/block/mirror.c
index efec2c7674..959e3dfbd6 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -771,13 +771,6 @@ static int mirror_exit_common(Job *job)
     block_job_remove_all_bdrv(bjob);
     bdrv_replace_node(mirror_top_bs, mirror_top_bs->backing->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);
-    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;
 
     bdrv_drained_end(src);