linux-kernel - Re: 2.a.30-rc7: fat filesystem misdetected as amiga

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Date:	Mon, 25 May 2009 17:08:12 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Michael S. Tsirkin" <mst@...hat.com>
cc:	Kay Sievers <kay.sievers@...y.org>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>
Subject: Re: 2.a.30-rc7: fat filesystem misdetected as amiga

On Mon, 25 May 2009, Michael S. Tsirkin wrote:

> > So apparently this is a bug in the device; it doesn't respond correctly
> > to the first READ command.  But since it does respond correctly to 
> > later commands, everything works okay thereafter.  You ought to be able 
> > to recover from the error by running
> > 
> > 	blockdev --rereadpt /dev/sdb
> > 
> > manually.
> 
> Yes, this helps.
> Would it make sense for kernel to retry automatically?
> Why doesn't it?

I don't know the details in this case.  Most likely the error code 
(Logical Block Address Out of Range) is interpreted as a fatal 
non-retryable error.  For other sorts of errors, the kernel does retry.

> > As far as I can tell, this has nothing to do with any user programs in 
> > the distribution.  It appears to be entirely the device's fault.
> > 
> > Alan Stern
> 
> BTW, any idea how come I later get errors apparently from amiga fs?

Not a clue.  Unless it was some odd side effect of the partition code 
trying to interpret an uninitialized buffer.

Alan Stern

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