Currently, migration will put a BDRV_O_INACTIVE flag on bs's open_flags until another resume being called. In that case, any IO from vm or block jobs will cause a qemu crash with an assert 'assert(!(bs->open_flags & BDRV_O_INACTIVE))' failure in bdrv_co_pwritev function. we hereby disallow block jobs by faking a blocker. Signed-off-by: wangjian161 <wangjian161@huawei.com>
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