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H A D | snapshot.c | 3432a192 Tue Oct 21 08:38:01 GMT 2014 Zhang Haoyu <zhanghy@sangfor.com> snapshot: add bdrv_drain_all() to bdrv_snapshot_delete() to avoid concurrency problem
If there are still pending i/o while deleting snapshot, because deleting snapshot is done in non-coroutine context, and the pending i/o read/write (bdrv_co_do_rw) is done in coroutine context, so it's possible to cause concurrency problem between above two operations. Add bdrv_drain_all() to bdrv_snapshot_delete() to avoid this problem.
Signed-off-by: Zhang Haoyu <zhanghy@sangfor.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 201410211637596311287@sangfor.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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