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block: bdrv_append(): don't consume reference

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We have too much comments for this feature. It seems better just don't
do it. Most of real users (tests don't count) have to create additional
reference.

Drop also comment in external_snapshot_prepare:
 - bdrv_append doesn't "remove" old bs in common sense, it sounds
   strange
 - the fact that bdrv_append can fail is obvious from the context
 - the fact that we must rollback all changes in transaction abort is
   known (it's the direct role of abort)

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20210428151804.439460-5-vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2021-04-28 18:17:32 +03:00 • committed by Kevin Wolf
parent 397f7cc0c2
commit ae9d441706
7 changed files with 8 additions and 31 deletions
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4
blockdev.c
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@ -1576,10 +1576,6 @@ static void external_snapshot_prepare(BlkActionState *common,
goto out;
}
/* This removes our old bs and adds the new bs. This is an operation that
* can fail, so we need to do it in .prepare; undoing it for abort is
* always possible. */
bdrv_ref(state->new_bs);
ret = bdrv_append(state->new_bs, state->old_bs, errp);
if (ret < 0) {
goto out;