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Message-ID: <9c638d96-d2b4-cf19-d7e8-4ef93549bd79@godking.net>
Date: Thu, 17 May 2018 01:15:04 -0700
From: Alexander Kappner <agk@...king.net>
To: Alan Stern <stern@...land.harvard.edu>
Cc: gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
usb-storage@...ts.one-eyed-alien.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb-storage: Add quirks to make G-Technology "G-Drive"
work
Hi Alan,
thanks for reviewing. (This is my first contribution that touches
usb-storage, so please bear with me.)
> That's kind of weird. Does the drive work under Windows in UAS mode?
On the Windows 10 VM that I just spun up for testing this, access to the
drive uses "usbstor.inf" (rather than "uaspstor.sys"). So I believe the
answer is no.
> If so, why are the WRITE(16) commands failing under Linux?
I don't know exactly why they're failing, but another entry in the
unusual_uas.h shows another SimpleTech device (only with a slightly
different product ID) needing the same UAS quirk (see
https://bugzilla.redhat.com/show_bug.cgi?id=1124119). So my guess is those
drives are just buggy.
> That doesn't quite make sense. Since you prevent the uas driver from
> binding to this device, it will end up using usb-storage no matter how
> the kernel was built. Therefore the second quirk flag has to go into
> unusual_devs.h no matter what.
Yes that's what I was trying to get at. So even though the UAS flag would
conceptually belong into unusual_uas, I'm putting both into unusual_devs to
avoid having to create two separate entries for the same device.
> You don't describe the second quirk flag at all. Are you sure it is
> needed?
Yes. Without this flag, the device keeps throwing similar errors on
usb-storage. That's the same result I get on a host that doesn't have UAS
compiled in. Here's a dmesg:
[ 2.183472] usb 3-1: New USB device found, idVendor=4971, idProduct=8024, bcdDevice=24.03
[ 2.184285] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 2.184980] usb 3-1: Product: G-DRIVE
[ 2.185447] usb 3-1: Manufacturer: HGST
[ 2.185829] usb 3-1: SerialNumber: AA015010004C
[ 2.195509] usb-storage 3-1:1.0: USB Mass Storage device detected
[ 2.198668] Floppy drive(s): fd0 is 2.88M AMI BIOS
[ 2.202981] scsi host2: usb-storage 3-1:1.0
...
[ 3.233085] scsi 2:0:0:0: Direct-Access G-DRIVE 2403 PQ: 0 ANSI: 6
[ 3.234514] sd 2:0:0:0: Attached scsi generic sg1 type 0
[ 3.235465] sd 2:0:0:0: [sda] Very big device. Trying to use READ CAPACITY(16).
[ 3.236847] sd 2:0:0:0: [sda] 7814037168 512-byte logical blocks: (4.00 TB/3.64 TiB)
[ 3.237794] sd 2:0:0:0: [sda] 4096-byte physical blocks
[ 3.241255] sd 2:0:0:0: [sda] Write Protect is off
[ 3.242096] sd 2:0:0:0: [sda] Mode Sense: 47 00 10 08
[ 3.243595] sd 2:0:0:0: [sda] Write cache: enabled, read cache: enabled, supports DPO and FUA
[ 3.257893] sda: sda1 sda9
[ 3.261402] sd 2:0:0:0: [sda] Attached SCSI disk
...
[ 92.433428] sd 2:0:0:0: [sda] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 92.434759] sd 2:0:0:0: [sda] tag#0 Sense Key : Illegal Request [current]
[ 92.435637] sd 2:0:0:0: [sda] tag#0 Add. Sense: Invalid field in cdb
[ 92.436401] sd 2:0:0:0: [sda] tag#0 CDB: Write(16) 8a 08 00 00 00 00 00 00 00 00 00 00 00 08 00 00
[ 92.437493] print_req_error: critical target error, dev sda, sector 0
[ 92.438211] Buffer I/O error on dev sda, logical block 0, lost sync page write
[ 92.516692] EXT4-fs (sda): mounted filesystem with ordered data mode. Opts: (null)
[ 101.449311] sd 2:0:0:0: [sda] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 101.450598] sd 2:0:0:0: [sda] tag#0 Sense Key : Illegal Request [current]
[ 101.451401] sd 2:0:0:0: [sda] tag#0 Add. Sense: Invalid field in cdb
[ 101.452041] sd 2:0:0:0: [sda] tag#0 CDB: Write(16) 8a 08 00 00 00 00 e8 c4 00 18 00 00 00 08 00 00
[ 101.452906] print_req_error: critical target error, dev sda, sector 3905159192
[ 101.453593] print_req_error: critical target error, dev sda, sector 3905159192
[ 101.454889] Aborting journal on device sda-8.
[ 101.457103] sd 2:0:0:0: [sda] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 101.457988] sd 2:0:0:0: [sda] tag#0 Sense Key : Illegal Request [current]
[ 101.458637] sd 2:0:0:0: [sda] tag#0 Add. Sense: Invalid field in cdb
[ 101.459250] sd 2:0:0:0: [sda] tag#0 CDB: Write(16) 8a 08 00 00 00 00 e8 c4 00 00 00 00 00 08 00 00
Source code comments describe this as a known problem (scsiglue.c:182):
/*
* Some devices don't like MODE SENSE with page=0x3f,
* which is the command used for checking if a device
* is write-protected. Now that we tell the sd driver
* to do a 192-byte transfer with this command the
* majority of devices work fine, but a few still can't
* handle it. The sd driver will simply assume those
* devices are write-enabled.
*/
if (us->fflags & US_FL_NO_WP_DETECT)
sdev->skip_ms_page_3f = 1;
--agk
On 05/16/2018 01:55 PM, Alan Stern wrote:
> On Wed, 16 May 2018, Alexander Kappner wrote:
>
>> The "G-Drive" (sold by G-Technology) external USB 3.0 drive
>> hangs on write access under UAS:
>>
>> [ 136.079121] sd 15:0:0:0: [sdi] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
>> [ 136.079144] sd 15:0:0:0: [sdi] tag#0 Sense Key : Illegal Request [current]
>> [ 136.079152] sd 15:0:0:0: [sdi] tag#0 Add. Sense: Invalid field in cdb
>> [ 136.079176] sd 15:0:0:0: [sdi] tag#0 CDB: Write(16) 8a 08 00 00 00 00 00 00 00 00 00 00 00 08 00 00
>> [ 136.079180] print_req_error: critical target error, dev sdi, sector 0
>> [ 136.079183] Buffer I/O error on dev sdi, logical block 0, lost sync page write
>> [ 136.173148] EXT4-fs (sdi): mounted filesystem with ordered data mode. Opts: (null)
>> [ 140.583998] sd 15:0:0:0: [sdi] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
>> [ 140.584010] sd 15:0:0:0: [sdi] tag#0 Sense Key : Illegal Request [current]
>> [ 140.584016] sd 15:0:0:0: [sdi] tag#0 Add. Sense: Invalid field in cdb
>> [ 140.584022] sd 15:0:0:0: [sdi] tag#0 CDB: Write(16) 8a 08 00 00 00 00 e8 c4 00 18 00 00 00 08 00 00
>> [ 140.584025] print_req_error: critical target error, dev sdi, sector 3905159192
>> [ 140.584044] print_req_error: critical target error, dev sdi, sector 3905159192
>> [ 140.584052] Aborting journal on device sdi-8.
>
> That's kind of weird. Does the drive work under Windows in UAS mode?
> If so, why are the WRITE(16) commands failing under Linux?
>
>> The proposed patch adds compatibility quirks. Because the drive requires two
>> quirks (one to disable UAS, and another to work with usb-storage), adding this
>> under unusual_devs.h and not unusual_uas.h so kernels compiled without UAS
>> receive the quirk.
>
> That doesn't quite make sense. Since you prevent the uas driver from
> binding to this device, it will end up using usb-storage no matter how
> the kernel was built. Therefore the second quirk flag has to go into
> unusual_devs.h no matter what.
>
>> With the patch, the drive works reliably
>> (tested on NEC Corporation uPD720200 USB 3.0 host controller).
>
> You don't describe the second quirk flag at all. Are you sure it is
> needed?
>
>> Signed-off-by: Alexander Kappner <agk@...king.net>
>> ---
>> drivers/usb/storage/unusual_devs.h | 8 ++++++++
>> 1 file changed, 8 insertions(+)
>>
>> diff --git a/drivers/usb/storage/unusual_devs.h b/drivers/usb/storage/unusual_devs.h
>> index 747d3a9..b8661a1 100644
>> --- a/drivers/usb/storage/unusual_devs.h
>> +++ b/drivers/usb/storage/unusual_devs.h
>> @@ -2321,6 +2321,15 @@ UNUSUAL_DEV( 0x4146, 0xba01, 0x0100, 0x0100,
>> "Micro Mini 1GB",
>> USB_SC_DEVICE, USB_PR_DEVICE, NULL, US_FL_NOT_LOCKABLE ),
>>
>> +/* "G-DRIVE" external HDD hangs on write without these.
>> + * Reported-by: Alexander Kappner <agk@...king.net>
>> + */
>> +UNUSUAL_DEV(0x4971, 0x8024, 0x0000, 0x9999,
>> + "SimpleTech",
>> + "External HDD",
>> + USB_SC_DEVICE, USB_PR_DEVICE, NULL,
>> + US_FL_IGNORE_UAS | US_FL_NO_WP_DETECT),
>> +
>> /*
>> * Nick Bowler <nbowler@...iptictech.com>
>> * SCSI stack spams (otherwise harmless) error messages.
>>
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