On Thu, Dec 15, 2011 at 10:26 PM, Mark Lord [off-list ref] wrote:

On 11-12-15 01:38 PM, Robert Hancock wrote:

quoted

On Thu, Dec 15, 2011 at 5:01 AM, Juergen Beisert [off-list ref] wrote:

..

quoted

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As far as I understand the problem of this kind of errors is for the multi
sector write case. The framework does not know what sectors fails, so the
question is: does it repeat the whole multi sector sequence or what else it
does?

The entire request should get retried.

I'm not so sure that is correct.

The Linux IDE stack will not retry the completed sectors
(those which were successfully transfered in multiple-sector blocks).

Not sure what libata does here.

I don't know of any logic in libata that tries to do selective
retries. In many cases we wouldn't know where in the request it failed
in any case. There's no real reason to do this anyway as redoing a bit
of I/O after a device error shouldn't be a big deal.