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block: Remove subtree drains

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Subtree drains are not used any more. Remove them.

After this, BdrvChildClass.attach/detach() don't poll any more.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20221118174110.55183-11-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2022-11-18 18:41:05 +01:00
parent 92140b9f3f
commit 299403aeda
6 changed files with 44 additions and 389 deletions
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include/block/block_int-common.h
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@ -1184,7 +1184,6 @@ struct BlockDriverState {
/* Accessed with atomic ops. */
int quiesce_counter;
int recursive_quiesce_counter;
unsigned int write_gen; /* Current data generation */