linux-ext4 - Re: Weird I/O errors with USB hard drive not remounting filesystem readonly

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Message-ID: <20091123160914.GG15679@duck.suse.cz>
Date:	Mon, 23 Nov 2009 17:09:14 +0100
From:	Jan Kara <jack@...e.cz>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Jan Kara <jack@...e.cz>, tmhikaru@...il.com,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	Jens Axboe <axboe@...nel.dk>, linux-scsi@...r.kernel.org,
	linux-ext4@...r.kernel.org
Subject: Re: Weird I/O errors with USB hard drive not remounting filesystem
 readonly

On Mon 23-11-09 10:06:03, Alan Stern wrote:
> On Mon, 23 Nov 2009, Jan Kara wrote:
> 
> >   Yeah, from what you write, it looks like USB enclosure is at fault (or it
> > could still be your USB controller but I doubt it).  It's still a bit
> > bothering that the error reported by the drive was not properly propagated
> > up to VFS. Either it's some block layer retry/ignore magic that I missed or
> > we ignore errors from block layer in some place.
> 
> Is there any interest in tracking this down?  It's not hard to find out
> what low-level errors are being reported and to generate them on demand
> with an emulated USB disk drive.
  Well, if you could provide me with the patch, I could try to track down
why the errors aren't propagated... It would be interesting because if it's
not some retry logic in block layer, it's a bug in VFS ;).

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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