linux-kernel - Re: [PATCH 14/16] blkcg: don't allow or retain configuration of missing devices

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Message-ID: <20120124163431.GA421@google.com>
Date:	Tue, 24 Jan 2012 08:34:31 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	axboe@...nel.dk, ctalbott@...gle.com, rni@...gle.com,
	linux-kernel@...r.kernel.org, Kay Sievers <kay.sievers@...y.org>
Subject: Re: [PATCH 14/16] blkcg: don't allow or retain configuration of
 missing devices

On Tue, Jan 24, 2012 at 11:32:24AM -0500, Vivek Goyal wrote:
> > Yeap, there is.  Nice catch.  blkg_lookup_create() should be testing
> > blk_queue_bypass() instead of blk_queue_dead() and parse_and_set
> > should probably retry after a bit.  Will update.
> 
> So now group creation fails if queue is in bypass mode. So a per device
> rule setting will fail both for cfq and throttling logic while device
> is still around. So a user is supposed to retry? How would a user know 
> that elevator switch is happening and he should retry and till when should
> he retry.

Ummm... I'm working on the second patch which makes parse_and_set do
return restart_syscall().

-- 
tejun
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