Re: [PATCH 0/11] Per-bdi writeback flusher threads v9

From: Jens Axboe
Date: Thu May 28 2009 - 18:27:31 EST

On Thu, May 28 2009, Peter Zijlstra wrote:
> On Thu, 2009-05-28 at 17:19 +0300, Artem Bityutskiy wrote:
> > Artem Bityutskiy wrote:
> > > question is - should it? 'bdi_register()' a block device,
> > > but we do not have one.
> >
> > Sorry, wanted to say: 'bdi_register()' registers a block
> > device.
> BDI stands for backing device info and is not related to block devices
> other than that block devices can also be (ok, always are) backing
> devices.
> If you want to do writeback, you need a backing device to write to. The
> BDI is the device abstraction for writeback.

Precisely. Apparently ubifs doesn't register its backing device. I fixed
a similar issue in btrfs, I'll do an audit of the file systems and fix
that up.

Jens Axboe

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