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

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Message-ID: <20091124203944.GD16662@quack.suse.cz>
Date:	Tue, 24 Nov 2009 21:39:44 +0100
From:	Jan Kara <jack@...e.cz>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Jan Kara <jack@...e.cz>, Boaz Harrosh <bharrosh@...asas.com>,
	tmhikaru@...il.com,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>,
	Jens Axboe <axboe@...nel.dk>,
	SCSI development list <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 Tue 24-11-09 15:13:01, Alan Stern wrote:
> On Tue, 24 Nov 2009, Jan Kara wrote:
> 
> >   After digging in block layer code, it's as we suspected:
> > In case of host error DID_ERROR (which is our case), scsi request is
> > retried iff it is not a FAILFAST request which is set if bio is doing
> > readahead... So this is explained and everything behaves as it should.
> > Thanks everybody involved :).
> 
> Okay, very good.  There remains the question of the disturbing error
> messages in the system log.  Should they be supressed for FAILFAST
> requests?
  I think it's useful they are there because ultimately, something really
went wrong and you should better investigate. BTW, "end_request: I/O error"
messages are in the log even for requests where we retried and succeeded...

								Honza
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