Date: Fri, 7 Jan 2000 10:01:19 +1100 From: Peter Jeremy <peter.jeremy@alcatel.com.au> To: freebsd-current@FreeBSD.ORG Subject: Re: ATA driver problems Message-ID: <00Jan7.100119est.40323@border.alcanet.com.au> In-Reply-To: <20000106103851.A620@gsmx07.alcatel.com.au>; from peter.jeremy@alcatel.com.au on Thu, Jan 06, 2000 at 10:38:51AM %2B1100 References: <20000106103851.A620@gsmx07.alcatel.com.au>
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On 2000-Jan-06 10:38:51 +1100, I wrote: ["dd if=/dev/rad0c of=/dev/null bs=64k" dies with an error] I did some poking around and found that there are two bugs which conspire together to cause this: 1) diskstrategy() does not detect dscheck() returning EOF, instead passing a zero-length request to the underlying driver. 2) The ata-disk driver doesn't check for (and ignore) zero-length requests, instead passing them onto the disk. See kern/15956 for details and patches. Peter To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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