linux-kernel - Re: "WRITE SAME failed. Manually zeroing" with 3w-xxxx driver

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Date:	Tue, 30 Apr 2013 09:36:44 +0200
From:	Florian Westphal <fw@...len.de>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>
Cc:	Florian Westphal <fw@...len.de>, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, axboe@...nel.dk,
	adam radford <aradford@...il.com>
Subject: Re: "WRITE SAME failed. Manually zeroing" with 3w-xxxx driver

Martin K. Petersen <martin.petersen@...cle.com> wrote:
> >>>>> "Florian" == Florian Westphal <fw@...len.de> writes:
> 
> Florian> After update to 3.8 dmesg is spammed with: kernel: [
> Florian> 280.272094] 3w-xxxx: scsi8: Unknown scsi opcode: 0x41 kernel: [
> Florian> 280.272107] sd 8:0:0:0: [sda] Unhandled error code kernel: 
> 
> Could you please test the patch below?

Works. Only one WRITE_SAME error at boot, max_write_same_blocks in sysfs
is 0, which wasn't the case before.

> The second question is what it is that's issuing these zeroouts at boot?
> Which filesystem are you using? What's your DM/MD config?

ext4, no DM/MD is used.  I guess the zeroouts are from postgres, but i'm
not sure.

> 3w-xxxx: Create sense buffer for unsupported commands
> 
> Make the driver return appropriate sense data when an unsupported
> operation is queued. This will cause the SCSI layer to stop issuing the
> offending command.
> 
> Reported-by: Florian Westphal <fw@...len.de>
> CC: adam radford <aradford@...il.com>
> Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>

Tested-by: Florian Westphal <fw@...len.de>

Thanks again.
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