From: Pat LaVarre <p.lavarre@ieee.org>
To: dougg@torque.net
Cc: linux-scsi@vger.kernel.org
Subject: Re: zero block writes
Date: 20 Oct 2003 16:46:46 -0600 [thread overview]
Message-ID: <1066690005.2814.14.camel@patehci2> (raw)
In-Reply-To: <3F8C79F0.6070105@torque.net>
> > $ sg_dd of=/dev/sg0 if=/dev/null bs=2k count=1
> > 0+0 records in
> > 0+0 records out
> > $
> >
> > cdb trace tells me this sg utils idiom assaults the device with a zero
> > block write, specifically:
> > ...
> > usb-storage: Command WRITE_10 (10 bytes)
> > usb-storage: 2a 00 00 00 00 00 00 00 00 00
> > ...
>
> A new beta (1.05) should be out tomorrow that fixes this
> (I just put one up about 1 hour ago).
Looks good, thank you. Again I tried contrasting:
sg_dd of=/dev/sg0 if=/dev/zero bs=2k count=1
sg_dd of=/dev/sg0 if=/dev/null bs=2k count=1
I'm pleased to report the sg3_utils-1.05.tar.gz I fetched today passes
cdb's thru drivers/usb/storage/usb.usb_stor_show_command only from
/dev/zero, not from /dev/null.
Pat LaVarre
next prev parent reply other threads:[~2003-10-20 22:46 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-14 19:48 zero block writes Pat LaVarre
2003-10-14 22:34 ` Douglas Gilbert
2003-10-14 23:18 ` Pat LaVarre
2003-10-20 17:55 ` Pat LaVarre
2003-10-20 22:46 ` Pat LaVarre [this message]
2003-10-14 22:43 ` Pat LaVarre
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