Date: Mon, 05 Mar 2007 21:37:33 -0700 From: Scott Long <scottl@samsco.org> To: Craig Boston <craig@feniz.gank.org>, freebsd-stable@freebsd.org Subject: Re: umass media size off-by-one? Message-ID: <45ECF00D.3070101@samsco.org> In-Reply-To: <20070306020826.GA18228@nowhere> References: <20070306020826.GA18228@nowhere>
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Craig Boston wrote: > Hi all, I ran into this while trying to use geli to encrypt an external > usb-2 hard drive. It appears that sometimes the media size reported by > umass is one sector too big. For example: > > umass0: Prolific Technology Inc. Mass Storage Device, rev 2.00/1.00, addr 2 > da0 at umass-sim0 bus 0 target 0 lun 0 > da0: <WDC WD18 00JB-00DUA0 65.1> Fixed Direct Access SCSI-0 device > da0: 40.000MB/s transfers > da0: 171705MB (351651889 512 byte sectors: 255H 63S/T 21889C) > > # dd if=/dev/zero of=/dev/da0 oseek=351651888 count=1 > dd: /dev/da0: Input/output error > 1+0 records in > 0+0 records out > 0 bytes transferred in 0.002951 secs (0 bytes/sec) > > # dd if=/dev/zero of=/dev/da0 oseek=351651887 count=1 > 1+0 records in > 1+0 records out > 512 bytes transferred in 0.000982 secs (521360 bytes/sec) > > This is with a "high speed, power 100 mA, config 1, Mass Storage > Device(0x3507), Prolific Technology Inc.(0x067b), rev 1.00" enclosure. > I tested with two USB flash memory devices and those seem to report the > correct size. > > I'm currently rebuilding a kernel with USB_DEBUG to see if it's specific > to a certain protocol and try to figure out if it's a bug in one of them > or if the enclosure is lying. Has anyone run into this before? > > Craig Fixed in 7-CURRENT. Contact Warner Losh to make sure that your device is quirked appropriately. Scott
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