Re: Yet another Seagate quirk for unusual_uas.h

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On Sun, Sep 17, 2017 at 7:02 PM, Kris Lindgren <kris.lindgren@xxxxxxxxx> wrote:
> On Sun, Sep 17, 2017 at 3:41 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
>> Please use Reply-To-All so that your message gets sent to the mailing
>> and not just to me.
>>
>> Also, please don't top-post.
>>
>> On Sun, 17 Sep 2017, Kris Lindgren wrote:
>>
>>> Sorry, Let me be more specific and answer your questions.
>>>
>>> Without any changes, I plugin the drive, it will fail with sector 0
>>> errors on any action that attempts to write against it.  Such as
>>> formating the volume, creating a folder, touching a file, ect ect.
>>> Unloading usb_storage and reloading it with:
>>> quirks=0bc2:3332:uw causes the drive to function without any issues.
>>> Trying just quirks=0bc2:3332:u or quirks=0bc2:3332:t (as some other
>>> people reported for other seagate explansions drives) still cause
>>> sector 0 errors to show up.
>>
>> What happens with quirks=0bc2:3332:w (leave out the u)?
>> And can you provide the output from lsusb -v for this device?
>
> The drive actually mounts and works fine.  I was able to write 10GB to
> it successfully at an average speed of ~133.9MB/s.
>
> # lsusb -v
>
> Bus 002 Device 011: ID 0bc2:3332 Seagate RSS LLC
> Device Descriptor:
>   bLength                18
>   bDescriptorType         1
>   bcdUSB               3.00
>   bDeviceClass            0 (Defined at Interface level)
>   bDeviceSubClass         0
>   bDeviceProtocol         0
>   bMaxPacketSize0         9
>   idVendor           0x0bc2 Seagate RSS LLC
>   idProduct          0x3332
>   bcdDevice            0.12
>   iManufacturer           1 Seagate
>   iProduct                2 External
>   iSerial                 3 2GHP5NM9
>   bNumConfigurations      1
>   Configuration Descriptor:
>     bLength                 9
>     bDescriptorType         2
>     wTotalLength           44
>     bNumInterfaces          1
>     bConfigurationValue     1
>     iConfiguration          0
>     bmAttributes         0xc0
>       Self Powered
>     MaxPower               24mA
>     Interface Descriptor:
>       bLength                 9
>       bDescriptorType         4
>       bInterfaceNumber        0
>       bAlternateSetting       0
>       bNumEndpoints           2
>       bInterfaceClass         8 Mass Storage
>       bInterfaceSubClass      6 SCSI
>       bInterfaceProtocol     80 Bulk (Zip)
>       iInterface              0
>       Endpoint Descriptor:
>         bLength                 7
>         bDescriptorType         5
>         bEndpointAddress     0x81  EP 1 IN
>         bmAttributes            2
>           Transfer Type            Bulk
>           Synch Type               None
>           Usage Type               Data
>         wMaxPacketSize     0x0400  1x 0 bytes
>         bInterval               0
>         UNRECOGNIZED:  06 30 0f 00 00 00
>       Endpoint Descriptor:
>         bLength                 7
>         bDescriptorType         5
>         bEndpointAddress     0x02  EP 2 OUT
>         bmAttributes            2
>           Transfer Type            Bulk
>           Synch Type               None
>           Usage Type               Data
>         wMaxPacketSize     0x0400  1x 0 bytes
>         bInterval               0
>         UNRECOGNIZED:  06 30 0f 00 00 00
> Device Status:     0x000d
>   Self Powered
>   Test Mode
>
> Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> Device Descriptor:
>   bLength                18
>   bDescriptorType         1
>   bcdUSB               3.00
>   bDeviceClass            9 Hub
>   bDeviceSubClass         0 Unused
>   bDeviceProtocol         3
>   bMaxPacketSize0         9
>   idVendor           0x1d6b Linux Foundation
>   idProduct          0x0003 3.0 root hub
>   bcdDevice            4.02
>   iManufacturer           3 Linux 4.2.8 xhci-hcd
>   iProduct                2 xHCI Host Controller
>   iSerial                 1 0000:00:14.0
>   bNumConfigurations      1
>   Configuration Descriptor:
>     bLength                 9
>     bDescriptorType         2
>     wTotalLength           31
>     bNumInterfaces          1
>     bConfigurationValue     1
>     iConfiguration          0
>     bmAttributes         0xe0
>       Self Powered
>       Remote Wakeup
>     MaxPower                0mA
>     Interface Descriptor:
>       bLength                 9
>       bDescriptorType         4
>       bInterfaceNumber        0
>       bAlternateSetting       0
>       bNumEndpoints           1
>       bInterfaceClass         9 Hub
>       bInterfaceSubClass      0 Unused
>       bInterfaceProtocol      0 Full speed (or root) hub
>       iInterface              0
>       Endpoint Descriptor:
>         bLength                 7
>         bDescriptorType         5
>         bEndpointAddress     0x81  EP 1 IN
>         bmAttributes            3
>           Transfer Type            Interrupt
>           Synch Type               None
>           Usage Type               Data
>         wMaxPacketSize     0x0004  1x 4 bytes
>         bInterval              12
>         UNRECOGNIZED:  06 30 00 00 02 00
> can't get hub descriptor: Broken pipe
> Device Status:     0x0001
>   Self Powered
>
> Bus 001 Device 002: ID 1005:b155 Apacer Technology, Inc.
> Device Descriptor:
>   bLength                18
>   bDescriptorType         1
>   bcdUSB               2.00
>   bDeviceClass            0 (Defined at Interface level)
>   bDeviceSubClass         0
>   bDeviceProtocol         0
>   bMaxPacketSize0        64
>   idVendor           0x1005 Apacer Technology, Inc.
>   idProduct          0xb155
>   bcdDevice            1.00
>   iManufacturer           1
>   iProduct                2 USB DISK MODULE
>   iSerial                 3 190074BAA75C7223
>   bNumConfigurations      1
>   Configuration Descriptor:
>     bLength                 9
>     bDescriptorType         2
>     wTotalLength           32
>     bNumInterfaces          1
>     bConfigurationValue     1
>     iConfiguration          0
>     bmAttributes         0x80
>       (Bus Powered)
>     MaxPower              300mA
>     Interface Descriptor:
>       bLength                 9
>       bDescriptorType         4
>       bInterfaceNumber        0
>       bAlternateSetting       0
>       bNumEndpoints           2
>       bInterfaceClass         8 Mass Storage
>       bInterfaceSubClass      6 SCSI
>       bInterfaceProtocol     80 Bulk (Zip)
>       iInterface              0
>       Endpoint Descriptor:
>         bLength                 7
>         bDescriptorType         5
>         bEndpointAddress     0x81  EP 1 IN
>         bmAttributes            2
>           Transfer Type            Bulk
>           Synch Type               None
>           Usage Type               Data
>         wMaxPacketSize     0x0200  1x 512 bytes
>         bInterval               0
>       Endpoint Descriptor:
>         bLength                 7
>         bDescriptorType         5
>         bEndpointAddress     0x02  EP 2 OUT
>         bmAttributes            2
>           Transfer Type            Bulk
>           Synch Type               None
>           Usage Type               Data
>         wMaxPacketSize     0x0200  1x 512 bytes
>         bInterval               0
> Device Qualifier (for other device speed):
>   bLength                10
>   bDescriptorType         6
>   bcdUSB               2.00
>   bDeviceClass            0 (Defined at Interface level)
>   bDeviceSubClass         0
>   bDeviceProtocol         0
>   bMaxPacketSize0        64
>   bNumConfigurations      1
> Device Status:     0x0000
>   (Bus Powered)
>
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Device Descriptor:
>   bLength                18
>   bDescriptorType         1
>   bcdUSB               2.00
>   bDeviceClass            9 Hub
>   bDeviceSubClass         0 Unused
>   bDeviceProtocol         1 Single TT
>   bMaxPacketSize0        64
>   idVendor           0x1d6b Linux Foundation
>   idProduct          0x0002 2.0 root hub
>   bcdDevice            4.02
>   iManufacturer           3 Linux 4.2.8 xhci-hcd
>   iProduct                2 xHCI Host Controller
>   iSerial                 1 0000:00:14.0
>   bNumConfigurations      1
>   Configuration Descriptor:
>     bLength                 9
>     bDescriptorType         2
>     wTotalLength           25
>     bNumInterfaces          1
>     bConfigurationValue     1
>     iConfiguration          0
>     bmAttributes         0xe0
>       Self Powered
>       Remote Wakeup
>     MaxPower                0mA
>     Interface Descriptor:
>       bLength                 9
>       bDescriptorType         4
>       bInterfaceNumber        0
>       bAlternateSetting       0
>       bNumEndpoints           1
>       bInterfaceClass         9 Hub
>       bInterfaceSubClass      0 Unused
>       bInterfaceProtocol      0 Full speed (or root) hub
>       iInterface              0
>       Endpoint Descriptor:
>         bLength                 7
>         bDescriptorType         5
>         bEndpointAddress     0x81  EP 1 IN
>         bmAttributes            3
>           Transfer Type            Interrupt
>           Synch Type               None
>           Usage Type               Data
>         wMaxPacketSize     0x0004  1x 4 bytes
>         bInterval              12
> Hub Descriptor:
>   bLength               9
>   bDescriptorType      41
>   nNbrPorts             7
>   wHubCharacteristic 0x000a
>     No power switching (usb 1.0)
>     Per-port overcurrent protection
>     TT think time 8 FS bits
>   bPwrOn2PwrGood       10 * 2 milli seconds
>   bHubContrCurrent      0 milli Ampere
>   DeviceRemovable    0xd8
>   PortPwrCtrlMask    0xff
>  Hub Port Status:
>    Port 1: 0000.0100 power
>    Port 2: 0000.0100 power
>    Port 3: 0000.0100 power
>    Port 4: 0000.0100 power
>    Port 5: 0000.0503 highspeed power enable connect
>    Port 6: 0000.0100 power
>    Port 7: 0000.0100 power
> Device Status:     0x0001
>   Self Powered
>
>
>>
>>> Re: running kernel 4.2.8 - This device is specifically a qnap NAS - I
>>> am not yet familiar enough with their firmware/busybox install to
>>> attempt custom compiling a different kernel and booting a headless
>>> system.  As such I do not currently have an easy way to rebuild the
>>> nas onto a newer kernel to test the latest.  I asked about unusual_uas
>>> - because I have seen other Seagate devices that needed to populated
>>> in there to work correctly.  Thus I had assumed that is what needed to
>>> do here.
>>
>> What happens if you plug the disk drive into a regular Linux desktop
>> computer?  Remember, if an unusual_uas.h entry is added, it will affect
>> those machines too.
>
> I will need to get back to you on this.  All of my other machines
> running linux, only have usb2.0 hubs.  They are also haven't been used
> in some time and are running older versions of Ubuntu.

I upgraded a machine to the latest Ubuntu LTS distro - which is using
the 4.4 kernel

When plugging in the drive without any modification, the drive fails to mount.
Dmesg output:
[  378.353553] usb 2-1.3: new high-speed USB device number 3 using ehci-pci
[  378.489981] usb 2-1.3: New USB device found, idVendor=0bc2, idProduct=3332
[  378.489985] usb 2-1.3: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[  378.489987] usb 2-1.3: Product: External
[  378.489989] usb 2-1.3: Manufacturer: Seagate
[  378.489990] usb 2-1.3: SerialNumber: 2GHP5NM9
[  378.650153] usb-storage 2-1.3:1.0: USB Mass Storage device detected
[  378.650267] scsi host6: usb-storage 2-1.3:1.0
[  378.650359] usbcore: registered new interface driver usb-storage
[  378.684653] usbcore: registered new interface driver uas
[  379.651163] scsi 6:0:0:0: Direct-Access     Seagate  External
  SG12 PQ: 0 ANSI: 4
[  379.651892] sd 6:0:0:0: Attached scsi generic sg2 type 0
[  379.652324] sd 6:0:0:0: [sdb] 3907029164 512-byte logical blocks:
(2.00 TB/1.82 TiB)
[  379.653077] sd 6:0:0:0: [sdb] Write Protect is off
[  379.653081] sd 6:0:0:0: [sdb] Mode Sense: 1c 00 00 00
[  379.654529] sd 6:0:0:0: [sdb] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[  379.723781]  sdb: sdb1
[  379.726584] sd 6:0:0:0: [sdb] Attached SCSI disk
[  379.907727] sd 6:0:0:0: [sdb] tag#0 FAILED Result:
hostbyte=DID_ERROR driverbyte=DRIVER_SENSE
[  379.907737] sd 6:0:0:0: [sdb] tag#0 Sense Key : Hardware Error
[current] [descriptor]
[  379.907741] sd 6:0:0:0: [sdb] tag#0 Add. Sense: No additional sense
information
[  379.907747] sd 6:0:0:0: [sdb] tag#0 CDB: ATA command pass
through(16) 85 06 20 00 00 00 00 00 00 00 00 00 00 00 e5 00
[  380.008600] sd 6:0:0:0: [sdb] tag#0 FAILED Result:
hostbyte=DID_ERROR driverbyte=DRIVER_SENSE
[  380.008608] sd 6:0:0:0: [sdb] tag#0 Sense Key : Hardware Error
[current] [descriptor]
[  380.008611] sd 6:0:0:0: [sdb] tag#0 Add. Sense: No additional sense
information
[  380.008616] sd 6:0:0:0: [sdb] tag#0 CDB: ATA command pass
through(12)/Blank a1 06 20 da 00 00 4f c2 00 b0 00 00
[  380.426654] sd 6:0:0:0: [sdb] tag#0 FAILED Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
[  380.426662] sd 6:0:0:0: [sdb] tag#0 Sense Key : Illegal Request [current]
[  380.426666] sd 6:0:0:0: [sdb] tag#0 Add. Sense: Invalid field in cdb
[  380.426670] sd 6:0:0:0: [sdb] tag#0 CDB: Synchronize Cache(10) 35
00 00 00 00 00 00 00 00 00
[  380.426677] blk_update_request: critical target error, dev sdb, sector 0
[  380.426692] JBD2: recovery failed
[  380.426698] EXT4-fs (sdb1): error loading journal

kernel version is:  4.4.0-93-generic

I am working on upgrading to the latest release - which should give a
4.10 kernel

>
>>
>> Alan Stern
>>
>>> On Sun, Sep 17, 2017 at 11:39 AM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
>>> > On Sat, 16 Sep 2017, Kris Lindgren wrote:
>>> >
>>> >> Hello all,
>>> >>
>>> >> I have a Seagate External HDD PN: 9sean2-500 that works fine on USB2.0
>>> >> ports (and older kernels) however when connected to usb3.0 port on
>>> >> newer kernels, the drive fails any write access.
>>> >
>>> > This bug report seems to be a little confused.  (Or maybe I'm the one
>>> > who's confused...)
>>> >
>>> >> dmesg
>>> >> [ 7232.155430] usb 1-1: new high-speed USB device number 3 using xhci_hcd
>>> >> [ 7232.366548] usb-storage 1-1:1.0: USB Mass Storage device detected
>>> >> [ 7232.372833] scsi host6: usb-storage 1-1:1.0
>>> >
>>> > Why do you want to change unusual_uas.h, given that the device uses the
>>> > usb_storage driver and not the uas driver?
>>> >
>>> >> [ 7232.407777] [usb.001.003]
>>> >> /sys/devices/pci0000:00/0000:00:14.0/usb1/1-1 added. (MTP mode)
>>> >> [ 7233.378161] Check proc_name[usb-storage].
>>> >> [ 7233.382213] scsi 6:0:0:0: Direct-Access     Seagate  External
>>> >>   SG12 PQ: 0 ANSI: 4
>>> >> [ 7233.391359] Check proc_name[usb-storage].
>>> >> [ 7233.395405] Check proc_name[usb-storage].
>>> >> [ 7233.399446] Check proc_name[usb-storage].
>>> >> [ 7233.403597] Check proc_name[usb-storage].
>>> >> [ 7233.407925] sd 6:0:0:0: [sdc] 3907029164 512-byte logical blocks:
>>> >> (2.00 TB/1.81 TiB)
>>> >> [ 7233.408284] Check proc_name[usb-storage].
>>> >> [ 7233.409122] sd 6:0:0:0: Attached scsi generic sg2 type 0
>>> >> [ 7233.425138] Check proc_name[usb-storage].
>>> >> [ 7233.429258] sd 6:0:0:0: [sdc] Write Protect is off
>>> >> [ 7233.434082] sd 6:0:0:0: [sdc] Mode Sense: 1c 00 00 00
>>> >> [ 7233.434725] sd 6:0:0:0: [sdc] Write cache: enabled, read cache:
>>> >> enabled, doesn't support DPO or FUA
>>> >> [ 7233.509519]  sdc: sdc1
>>> >> [ 7233.514748] sd 6:0:0:0: [sdc] Attached SCSI disk
>>> >> [ 7233.519392] Check proc_name[usb-storage].
>>> >> [ 7234.604324] blk_update_request: critical target error, dev sdc, sector 0
>>> >> [ 7234.634329] blk_update_request: critical target error, dev sdc, sector 0
>>> >> [ 7234.648551] blk_update_request: critical target error, dev sdc, sector 0
>>> >> [ 7234.666908] blk_update_request: critical target error, dev sdc, sector 0
>>> >> [ 7234.680716] blk_update_request: critical target error, dev sdc, sector 0
>>> >> [ 7234.696723] blk_update_request: critical target error, dev sdc, sector 0
>>> >> [ 7234.709937] blk_update_request: critical target error, dev sdc, sector 0
>>> >> [ 7234.725250] blk_update_request: critical target error, dev sdc, sector 0
>>> >> [ 7234.739041] blk_update_request: critical target error, dev sdc, sector 0
>>> >> [ 7234.894452] JBD2: recovery failed
>>> >>
>>> >> lsusb:
>>> >> # lsusb
>>> >> Bus 002 Device 011: ID 0bc2:3332 Seagate RSS LLC
>>> >> Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
>>> >> Bus 001 Device 002: ID 1005:b155 Apacer Technology, Inc.
>>> >> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>>> >>
>>> >> uname:
>>> >> # uname -a
>>> >> Linux NAS 4.2.8 #1 SMP Fri Sep 1 01:08:22 CST 2017 x86_64 GNU/Linux
>>> >
>>> > Why aren't you using an up-to-date kernel version, such as 4.13?  A lot
>>> > of bugs have been fixed since 4.2 was released.
>>> >
>>> >> I did some looking around and based upon a suse article I unloaded the
>>> >> usb_storage and reloaded it with:
>>> >> insmod /lib/modules/misc/usb-storage.ko quirks=0bc2:3332:uw
>>> >>
>>> >> I also tried: quirks=0bc2:3332:u, quirks=0bc2:3332:t and both of those
>>> >> still resulted in sector 0 errors.
>>> >
>>> > The u flag means not to use the uas driver, which the system wasn't
>>> > doing anyway.  The w flag means to skip testing whether the drive is
>>> > write-protected, which doesn't seem to be relevant in your case
>>> > (judging by the log messages).  The t flag means to disallow ATA
>>> > commands, and it used only by the uas driver (not by usb-storage).  So
>>> > it isn't relevant in your case either.
>>> >
>>> >> Since then the drive works without any issues:
>>> >
>>> > This contradicts what you just said about these quirk flags resulting
>>> > in sector 0 errors.
>>> >
>>> >> dmesg:
>>> >> 87955.810319] usbcore: deregistering interface driver usb-storage
>>> >> [87955.817949] Check proc_name[usb-storage].
>>> >> [87955.836434] Check proc_name[usb-storage].
>>> >> [88077.114724] usb-storage 1-5:1.0: USB Mass Storage device detected
>>> >> [88077.121004] scsi host7: usb-storage 1-5:1.0
>>> >> [88077.125558] usbcore: registered new interface driver usb-storage
>>> >> [88078.125454] Check proc_name[usb-storage].
>>> >> [88078.129499] scsi 7:0:0:0: Direct-Access              USB DISK
>>> >> MODULE  PMAP PQ: 0 ANSI: 0 CCS
>>> >> [88078.139018] Check proc_name[usb-storage].
>>> >> [88078.143076] Check proc_name[usb-storage].
>>> >> [88078.147121] Check proc_name[usb-storage].
>>> >> [88078.151230] Check proc_name[usb-storage].
>>> >> [88078.155366] Check proc_name[usb-storage].
>>> >> [88078.155800] sd 7:0:0:0: [sdb] 1007616 512-byte logical blocks: (515
>>> >> MB/492 MiB)
>>> >> [88078.159485] sd 7:0:0:0: [sdb] Write Protect is off
>>> >> [88078.159490] sd 7:0:0:0: [sdb] Mode Sense: 23 00 00 00
>>> >> [88078.166791] sd 7:0:0:0: [sdb] No Caching mode page found
>>> >> [88078.166794] sd 7:0:0:0: [sdb] Assuming drive cache: write through
>>> >> [88078.183745] sd 7:0:0:0: Attached scsi generic sg1 type 0
>>> >> [88078.184349]  sdb: sdb1 sdb2 sdb3 sdb4 < sdb5 sdb6 >
>>> >> [88078.196597] Check proc_name[usb-storage].
>>> >> [88078.207147] sd 7:0:0:0: [sdb] Attached SCSI removable disk
>>> >> [88078.215229] Check proc_name[usb-storage].
>>> >> [88176.094207] xhci_hcd 0000:00:14.0: Command completion event does
>>> >> not match command
>>> >> [88176.101804] xhci_hcd 0000:00:14.0: Timeout while waiting for setup
>>> >> device command
>>> >> [88181.326070] xhci_hcd 0000:00:14.0: Timeout while waiting for setup
>>> >> device command
>>> >> [88181.534044] usb 2-1: device not accepting address 9, error -62
>>> >> [88183.336151] usb 2-1: new SuperSpeed USB device number 11 using xhci_hcd
>>> >> [88183.357090] usb-storage 2-1:1.0: USB Mass Storage device detected
>>> >> [88183.363355] usb-storage 2-1:1.0: Quirks match for vid 0bc2 pid 3332: 800200
>>> >> [88183.370500] scsi host8: usb-storage 2-1:1.0
>>> >> [88183.666134] [usb.002.011]
>>> >> /sys/devices/pci0000:00/0000:00:14.0/usb2/2-1 added. (MTP mode)
>>> >> [88184.375643] Check proc_name[usb-storage].
>>> >> [88184.379689] scsi 8:0:0:0: Direct-Access     Seagate  External
>>> >>   SG12 PQ: 0 ANSI: 4
>>> >> [88184.387937] Check proc_name[usb-storage].
>>> >> [88184.391992] Check proc_name[usb-storage].
>>> >> [88184.396033] Check proc_name[usb-storage].
>>> >> [88184.400153] Check proc_name[usb-storage].
>>> >> [88184.404274] Check proc_name[usb-storage].
>>> >> [88184.408454] sd 8:0:0:0: Attached scsi generic sg2 type 0
>>> >> [88184.415358] sd 8:0:0:0: [sdc] 3907029164 512-byte logical blocks:
>>> >> (2.00 TB/1.81 TiB)
>>> >> [88184.423138] sd 8:0:0:0: [sdc] Assuming Write Enabled
>>> >> [88184.428183] sd 8:0:0:0: [sdc] Assuming drive cache: write through
>>> >> [88184.434391] Check proc_name[usb-storage].
>>> >> [88184.501083]  sdc: sdc1
>>> >> [88184.505346] sd 8:0:0:0: [sdc] Attached SCSI disk
>>> >> [88184.510108] Check proc_name[usb-storage].
>>> >> [88185.285582] ufsd: "mount" (sdc1): is mounted as NTFS at 2017-09-16 09:22:29
>>> >> [88187.705544] flashcache flashcache_ioctl 21297
>>> >> [88187.713636] flashcache flashcache_ioctl 21297
>>> >> [88265.766096] flashcache flashcache_ioctl 21297
>>> >> [88265.771943] flashcache flashcache_ioctl 21297
>>> >> [88270.738679] ufsd: "umount" (sdc1): is unmounted at 2017-09-16 09:23:54
>>> >> [88272.804359] flashcache flashcache_ioctl 21297
>>> >> [88272.809101] flashcache flashcache_ioctl 21297
>>> >> [88280.727432] ext4_init_reserve_inode_table0: sdc1, 0
>>> >> [88280.732722] ext4_init_reserve_inode_table2: sdc1, 14905, 14905, 1907839, 4096
>>> >> [88280.742043] EXT4-fs (sdc1): mounted filesystem with ordered data
>>> >> mode. Opts: usrjquota=aquota.user,jqfmt=vfsv0,user_xattr,data=ordered,delalloc,noacl
>>> >> [88281.726223] EXT4-fs (device sdc1): ext4lazyinit start (start from
>>> >> 0, total 14905)
>>> >> [88282.800045] flashcache flashcache_ioctl 21297
>>> >> [88282.804821] flashcache flashcache_ioctl 21297
>>> >> [88287.456613] flashcache flashcache_ioctl 21297
>>> >> [88287.461512] flashcache flashcache_ioctl 21297
>>> >> [88360.898993] EXT4-fs (device sdc1): ext4lazyinit finish
>>> >>
>>> >> I am currently sustaining 100+ MB/s writes to the drive with those
>>> >> quirks flags added without any other changes.
>>> >
>>> > Which quirk flags?  You listed several possibilities, and none of them
>>> > seemed appropriate.
>>> >
>>> >> I looked at drivers/usb/storage/unusual_uas.h for my kernel (4.2.8)
>>> >> and the latest master.  It does not appear that this device is
>>> >> specifically called out as having an unusual uas, other very close
>>> >> Seagate drives do appear in that list.  What do you need from me to
>>> >> get this added?
>>> >
>>> > Exactly what do you want to add?
>>> >
>>> > Alan Stern
>>> >
>>>
>>
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