getting a disk structure given a device name

[Julian Elischer]

On 7/30/15 11:22 PM, Pokala, Ravi wrote:
>> Date: Wed, 29 Jul 2015 23:31:03 +0000
>> From: Raviprakash Darbha <rdarbha at juniper.net>
>> To: "freebsd-hackers at freebsd.org" <freebsd-hackers at freebsd.org>
>> Cc: Steve Kiernan <stevek at juniper.net>, Simon Gerraty
>> 	<sjg at juniper.net>
>> Subject: getting a disk structure given a device name
>> Message-ID: <F8ED1BDC-D8DA-458B-A652-B125183F27CB at juniper.net>
>> Content-Type: text/plain; charset="us-ascii"
>>
>> Hello All
>>
>> I am trying to write a filter driver for the ata block on freebsd 6.2 to
>> simulate failed reads and writes.

6.2!!!??
I thought I was in trouble being stuck on 8.0!

> We originally did something like that at Panasas, but by hacking ata(4)
> and ad(4) directly. :-P Later on, we created a GEOM class to do error
> injection. Currently, I prefer using the WRITE_UNCORRECTABLE48 command, to
> tell the drive to actually return errors on subsequent reads. That has the
> benefit of being indistinguishable from an actual read failure - the drive
> spends the time to do error recovery, and sends the actual error code back.
>
> -Ravi
>
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