From: Dave Jones <davej@redhat.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: Dave Chinner <david@fromorbit.com>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH] loop: Make explicit loop device destruction lazy
Date: Fri, 28 Sep 2012 10:38:44 -0400 [thread overview]
Message-ID: <20120928143844.GA1454@redhat.com> (raw)
In-Reply-To: <506562CE.2070500@kernel.dk>
On Fri, Sep 28, 2012 at 10:41:50AM +0200, Jens Axboe wrote:
> > Turns out that blkid is running simultaneously with losetup -d, and
> > so it sees an elevated reference count and returns EBUSY. But why
> > is blkid running? It's obvious, isn't it? udev has decided to try
> > and find out what is on the block device as a result of a creation
> > notification. And it is racing with mkfs, so might still be scanning
> > the device when mkfs finishes and we try to tear it down.
> >
> I hear that %^#@#! blkid behavior, it is such a pain in the neck. I
> don't know how many times I've had to explain that behaviour to people
> who run write testing with tracing, wonder wtf there are reads in the
> trace.
Could this problem explain this bug too ? https://bugzilla.redhat.com/show_bug.cgi?id=853674
Dave
next prev parent reply other threads:[~2012-09-28 14:38 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-28 6:09 [PATCH] loop: Make explicit loop device destruction lazy Dave Chinner
2012-09-28 8:41 ` Jens Axboe
2012-09-28 14:38 ` Dave Jones [this message]
2012-09-29 5:51 ` Jens Axboe
2012-09-28 15:02 ` Jeff Moyer
2012-09-29 5:50 ` Jens Axboe
2012-10-01 14:00 ` Jeff Moyer
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