From: Paolo Bonzini <pbonz...@redhat.com> Draining is not necessary, I/O can happen as soon as the commit coroutine yields. Draining can be necessary before reopening the file for read/write, or while modifying the backing file chain, but that is done separately in bdrv_reopen_multiple or bdrv_close; this particular bdrv_drain_all does nothing for that.
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com> Reviewed-by: Fam Zheng <f...@redhat.com> Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com> Message-id: 1432822903-25821-1-git-send-email-pbonz...@redhat.com Signed-off-by: Jeff Cody <jc...@redhat.com> --- blockdev.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/blockdev.c b/blockdev.c index 7fee519..50421c8 100644 --- a/blockdev.c +++ b/blockdev.c @@ -2380,9 +2380,6 @@ void qmp_block_commit(const char *device, aio_context = bdrv_get_aio_context(bs); aio_context_acquire(aio_context); - /* drain all i/o before commits */ - bdrv_drain_all(); - if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { goto out; } -- 1.9.3