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

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Message-ID: <20090525212325.GD6856@redhat.com>
Date:	Tue, 26 May 2009 00:23:25 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Alan Stern <stern@...land.harvard.edu>
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, May 25, 2009 at 05:08:12PM -0400, Alan Stern wrote:
> 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.

Who would know? The scsi crowd?

> > > 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

-- 
MST
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