Re: [RFC PATCH 0/2] a couple of readonly handling fixups

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On Tue, 11 May 2010 11:06:48 -0700
Dan Williams <dan.j.williams@xxxxxxxxx> wrote:

> On Sun, Jan 18, 2009 at 4:07 PM, Neil Brown <neilb@xxxxxxx> wrote:
> > On Thursday January 8, dan.j.williams@xxxxxxxxx wrote:
> >> The BUG_ON(mddev->ro == 1) in md_write_start can be triggered under two
> >> circumstances in recent kernels.  One was reported by Justin Maggard:
> >
> > Hi Dan,
> >  Thanks for following up with this.....
> >
> > (I meant to send this over a week ago, but I've been on vaction
> > in Tasmania and my mobile has no coverage....)
> >
> [..]
> >>       md: set mddev readonly flag on blkdev BLKROSET ioctl
> >
> > This one I'm happy with.  I'll make sure it gets through.
> 
> This slippery bugger seems to have evaded upstream, do you want me to resend?

No thanks, the link below is good enough.
That patch is now in my for-next branch and will go for-linus in
2.6.whatevercomesnext.

I normally stick that sort of thing somewhere in my stack before replying
that "I will make it so".  I guess I failed that time.


> 
> Here is a link for reference:
> http://marc.info/?l=linux-raid&m=123139948817348&w=2
> 
> I have seen another report of the md_write_start() BUG_ON triggering
> so I'm wondering if there are other ways for mddev->ro and
> bdev->bd_part->policy to get out of sync, or if they are just hitting
> the bug that this patch fixes?

Maybe we should just get rid of the BUG_ON?? 
Let's set how it goes once this patch is really in.

Thanks,
NeilBrown

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