Re: [PATCH] bcache: don't attach backing with duplicate UUID

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Hello Mike

I send the email from my personal mailbox(110950397@xxxxxx), it may be fail,
so I resend this email from my office mailbox again. bellow is the mail
context I send previous.

====================================================

I am Tang Junhui(tang.junhui@xxxxxxxxxx), This email comes from my
personal mailbox, since I am not in office today.

> > From: Tang Junhui <tang.junhui@xxxxxxxxxx>
> > 
> > Hello, Mike
> > 
> > This patch looks good, but has some conflicts with this patch:
> > bcache: fix for data collapse after re-attaching an attached device
> > https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?id=73ac105be390c1de42a2f21643c9778a5e002930
> > Could you modify your fix base on the previous patch?

> That doesn't make sense.  This patch was generated from a current tree
> where it's applied on top of that: (It's based on next when it should
> really be based on Linus's tree, but it doesn't matter for patch
> application because there's no changes in next right now to bcache that
> aren't in Linus's tree).

Originally, I did not mean merger conflicts, but the 
code logical conflicts, since the previous patch add a new input parameter
set_uuid in bch_cached_dev_attach(), and if set_uuid is not NULL,
we use set_uuid as cache set uuid, otherwise, we use dc->sb.set_uuid as
the cache set uuid.

But now, I read your patch again, and realize that you did not use 
dc->sb.set_uuid, but use dc->sb.uuid to judge whether the device is a
duplicate backend device, so it's OK for me.

> May I add your reviewed-by so I can send this (and your fix) upstream?
Reviewed-by: Tang Junhui <tang.junhui@xxxxxxxxxx>

Thanks 
Tang Junhui

Thanks
Tang Junhui
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