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qemu: use bdrv_flush_all for vm_stop et al 

Reimplement bdrv_flush_all for vm_stop. In contrast to blk_flush_all,
bdrv_flush_all does not have device model restrictions. This allows
us to flush and halt unconditionally without error.

This allows us to do things like migrate when we have a device with
an open tray, but has a node that may need to be flushed, or nodes
that aren't currently attached to any device and need to be flushed.

Specifically, this allows us to migrate when we have a CDROM with
an open tray.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
John Snow 2016-09-22 21:45:51 -04:00 committed by Kevin Wolf
parent 4085f5c7a2
commit 22af08eacf
1 changed files with 2 additions and 2 deletions
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4
cpus.c
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@ -751,7 +751,7 @@ static int do_vm_stop(RunState state)
bdrv_drain_all();
replay_disable_events();
ret = blk_flush_all();
ret = bdrv_flush_all();
return ret;
}
@ -1408,7 +1408,7 @@ int vm_stop_force_state(RunState state)
bdrv_drain_all();
/* Make sure to return an error if the flush in a previous vm_stop()
* failed. */
return blk_flush_all();
return bdrv_flush_all();
}
}