linux-kernel - Re: WARNING: at fs/block_dev.c:5 when removing LV on removed device

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Date:	Mon, 22 Jun 2015 13:55:41 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Christoph Hellwig <hch@....de>, Mike Snitzer <snitzer@...hat.com>,
	dm-devel@...hat.com, Andi Kleen <andi@...stfloor.org>,
	linux-kernel@...r.kernel.org
Subject: Re: WARNING: at fs/block_dev.c:5 when removing LV on removed device

On Mon, Jun 22, 2015 at 01:52:55PM -0400, Tejun Heo wrote:
> Hello,
> 
> On Mon, Jun 22, 2015 at 01:46:48PM -0400, Vivek Goyal wrote:
> > Subject: fs/block_dev.c: Warn on inode writeback failure instead of WARN_ON()
> > 
> > If a block device is hot removed and later last reference to devices
> > is put, we try to writeback the dirty inode. But device is gone and
> > that writeback fails.
> > 
> > Currently we do a WARN_ON() which does not seem to be the right thing.
> > Convert it to a ratelimited kernel warning.
> 
> Yeah, looks good to me.  Just one nit.
> 
> ...
> > +		if (write_inode_now(inode, true)) {
> > +			char name[BDEVNAME_SIZE] = "";
> > +			pr_warn_ratelimited("VFS: Dirty inode writeback failed for block device %s.\n", bdevname(bdev, name));
> 
> This wasn't reported before either but maybe we wanna report the errno
> too?  Also, don't we usually break the line for parameters?
> 
> 	pr_..("long format string going over 80 col...\n",
> 	      param0, param1, ...);

Hi Tejun, 

Will do. I have been doing some go programming in docker recently and this
has been a side effect of that. :-) Will format it correctly.

Thanks
Vivek
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