代码拉取完成，页面将自动刷新
This commit revert following three patches:
Before commit 8551c3543624 ("block: remove the bd_openers checks in
blk_drop_partitions"), if block device is opened already, rescan will fail
by checking bd_openers. And the commit remove such checking because
checking bd_openers is not logical, for example, if block device is
opened by someone else, rescan will always fail.
However, after the commit, we meet a problem that rescan a block device
with a mounted filesystem(ext4) will cause data lost. Since that mount
ext4 will set bd_super, fix the problem by checking bd_super instead of
bd_openers.
Noted that some filesystem(for example, ext4/xfs log device, btrfs) doesn't
set bd_super, such problem still exists.
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