[9fans] usb flash drive with ext2

[9fans] usb flash drive with ext2

[Rudolf Sykora]

Hello,

I have a usb flash drive.

[ When plugged into my linux, /var/log/messages gives:

Jan 11 10:28:14 redstar kernel: [  388.588091] usb 1-3: new high speed
USB device using ehci_hcd and address 3
Jan 11 10:28:14 redstar kernel: [  388.743813] usb 1-3: New USB device
found, idVendor=058f, idProduct=6387
Jan 11 10:28:14 redstar kernel: [  388.743826] usb 1-3: New USB device
strings: Mfr=1, Product=2, SerialNumber=3
Jan 11 10:28:14 redstar kernel: [  388.743837] usb 1-3: Product: Mass Storage
Jan 11 10:28:14 redstar kernel: [  388.743844] usb 1-3: Manufacturer: Generic
Jan 11 10:28:14 redstar kernel: [  388.743851] usb 1-3: SerialNumber: ABC01089
Jan 11 10:28:14 redstar kernel: [  388.746708] scsi4 : usb-storage 1-3:1.0
Jan 11 10:28:15 redstar kernel: [  389.749192] scsi 4:0:0:0:
Direct-Access     Generic  Flash Disk       8.07 PQ: 0 ANSI: 2
Jan 11 10:28:15 redstar kernel: [  389.753494] sd 4:0:0:0: Attached
scsi generic sg2 type 0
Jan 11 10:28:15 redstar kernel: [  389.754612] sd 4:0:0:0: [sdb]
8007680 512-byte logical blocks: (4.09 GB/3.81 GiB)
Jan 11 10:28:15 redstar kernel: [  389.755405] sd 4:0:0:0: [sdb] Write
Protect is off
Jan 11 10:28:15 redstar kernel: [  390.388661]  sdb: unknown partition table
Jan 11 10:28:15 redstar kernel: [  390.391887] sd 4:0:0:0: [sdb]
Attached SCSI removable disk
]

It has an ext2 filesystem on itself and can be, in linux, mounted:
mount /dev/sdb mnt
without errors, and works.

What should I do to be able to work with the drive (read/write) in plan9?
(When I plug it into my plan9 machine, I don't see any entry like
/dev/sdUXX, I see 3 entries under /dev/usb/, ep4.0, ep4.1 and ep4.2,
which appear/disappear as I plug/unplug the device. Running usb/disk
claims sth. like 'there is no disk unhandled').

Thank you for suggestions!
Ruda

Re: [9fans] usb flash drive with ext2

[Richard Miller]

> (When I plug it into my plan9 machine, I don't see any entry like
> /dev/sdUXX, I see 3 entries under /dev/usb/, ep4.0, ep4.1 and ep4.2,
> which appear/disappear as I plug/unplug the device. Running usb/disk
> claims sth. like 'there is no disk unhandled').

It appears you have no partition table and an ext2 fs occupying
the whole device.  This should be OK.

Try 'mount -a /srv/usb /dev' and see if /dev/sdUx.y appears.
If yes, try 'ext2srv -f /dev/sdUx.y/data && mount /srv/ext2 /n/linux'
If no, try 'cat /dev/usb/ep4.0/ctl' and see if you get something like:

	enabled control rw speed high maxpkt 64 pollival 0 samplesz 0 hz 0 hub 5 port 6 busy
	storage csp 0x500608 vid 0x058f did 0x6387 Generic 'Mass Storage' ehci

where "storage" means it's been recognised as a mass storage device,
and "busy" means it's already being handled by the usb/disk driver.

Re: [9fans] usb flash drive with ext2

[Rudolf Sykora]

On 11 January 2012 11:06, Richard Miller <9fans@hamnavoe.com> wrote:
> It appears you have no partition table and an ext2 fs occupying
> the whole device.  This should be OK.

Yes, I think the ext2 is really occupying the whole device. This is in
accord with what linux has said.

> Try 'mount -a /srv/usb /dev' and see if /dev/sdUx.y appears.

I will when I back home.

> If yes, try 'ext2srv -f /dev/sdUx.y/data && mount /srv/ext2 /n/linux'
> If no, try 'cat /dev/usb/ep4.0/ctl' and see if you get something like:
>
>        enabled control rw speed high maxpkt 64 pollival 0 samplesz 0 hz 0 hub 5 port 6 busy
>        storage csp 0x500608 vid 0x058f did 0x6387 Generic 'Mass Storage' ehci
>
> where "storage" means it's been recognised as a mass storage device,
> and "busy" means it's already being handled by the usb/disk driver.

This I tried yesterday (cat /dev/usb/ep4.0/ctl), and I saw both 'busy'
and 'storage'.

So perhaps 'mount -a /srv/usb /dev' will help.
Thanks!
Ruda

Re: [9fans] usb flash drive with ext2

[Rudolf Sykora]

On 11 January 2012 11:06, Richard Miller <9fans@hamnavoe.com> wrote:
> Try 'mount -a /srv/usb /dev' and see if /dev/sdUx.y appears.
> If yes, try 'ext2srv -f /dev/sdUx.y/data && mount /srv/ext2 /n/linux'
> If no, try 'cat /dev/usb/ep4.0/ctl' and see if you get something like:

1) Even though I plug in the usb stick, I have to manually run
'usb/disk' so that /dev/usb appears.
2) After 'mount -a /srv/usb /dev' /dev/sdU0.0 appears.
3) 'ext2srv -f /dev/sdU0.0/data && mount /srv/ext2 /n/linux' goes smoothly.
However.
; cd /n/linux
; lc
ls: .: I/O error

Any more help?

Thanks!
Ruda


PS.: 'cat /dev/usb/ep4.0/ctl' gives:
enabled control rw speed full maxpkt 64 pollival 0 samplesz 0 hz 0 hub
1 port 2 busy
storage csp 0x500608 vid 0x058f did 0x6387 Generic 'Mass Storage' uhci

Re: [9fans] usb flash drive with ext2

[Richard Miller]

> 3) 'ext2srv -f /dev/sdU0.0/data && mount /srv/ext2 /n/linux' goes smoothly.
> However.
> ; cd /n/linux
> ; lc
> ls: .: I/O error
>
> Any more help?

Try invoking ext2srv with '-v' to get more diagnostics.
Try 'dd -if /dev/sdU0.0/data -of /dev/null' to see if usb driver
is having trouble reading the device.

Re: [9fans] usb flash drive with ext2

[Rudolf Sykora]

On 12 January 2012 11:07, Richard Miller <9fans@hamnavoe.com> wrote:
>> 3) 'ext2srv -f /dev/sdU0.0/data && mount /srv/ext2 /n/linux' goes smoothly.
>> However.
>> ; cd /n/linux
>> ; lc
>> ls: .: I/O error
>>
>> Any more help?
>
> Try invoking ext2srv with '-v' to get more diagnostics.

ext2srv 220: serving ext2
destroy(fid=302)
attach(fid=302,uname="ruda",aname="",afid="-1")...alloc
"/dev/sdU0.0/data", dev=3...good super block...OK

> Try 'dd -if /dev/sdU0.0/data -of /dev/null' to see if usb driver
> is having trouble reading the device.

0+1 records in
0+1 records out

The last bit is strange, isn't it?
Ruda

Re: [9fans] usb flash drive with ext2

[Richard Miller]

>> Try 'dd -if /dev/sdU0.0/data -of /dev/null' to see if usb driver
>> is having trouble reading the device.
>
> 0+1 records in
> 0+1 records out
>
> The last bit is strange, isn't it?

Try 'cat /dev/sdU0.0/ctl' to see if usb/disk has got the
geometry wrong.

Re: [9fans] usb flash drive with ext2

[Rudolf Sykora]

On 12 January 2012 11:26, Richard Miller <9fans@hamnavoe.com> wrote:
>>> Try 'dd -if /dev/sdU0.0/data -of /dev/null' to see if usb driver
>>> is having trouble reading the device.
>>
>> 0+1 records in
>> 0+1 records out
>>
>> The last bit is strange, isn't it?
>
> Try 'cat /dev/sdU0.0/ctl' to see if usb/disk has got the
> geometry wrong.

/dev/usb/ep4.0 lun 0: inquiry Generic Flash Disk      8.07 geometry 8007680 512

linux' fdisk says:

Command (m for help): p

Disk /dev/sdb: 4099 MB, 4099932160 bytes
127 heads, 62 sectors/track, 1016 cylinders, total 8007680 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xde308271

   Device Boot      Start         End      Blocks   Id  System

Command (m for help):

... so I'd think this is ok ...

Ruda

Re: [9fans] usb flash drive with ext2

[Richard Miller]

> /dev/usb/ep4.0 lun 0: inquiry Generic Flash Disk      8.07 geometry 8007680 512
>
> ... so I'd think this is ok ...

My next step would be to get more diagnostic output from usb/disk.
This is no longer easy with the new monolithic usb driver
architecture.  You can't just start 'usb/disk -d' because the usb/disk
embedded into usb/usbd will have started automatically and seized
control of the device when you plugged it in.

I think you will need to generate a new usbd with the disk driver
configured out (see /sys/src/cmd/usb/usbd/usbdb), then kill the usbd
which is embedded into the kernel and start your new one, before
running usb/disk.

Re: [9fans] usb flash drive with ext2

[Francisco J Ballesteros]

you can enable debug diagnostics for devices by using the usbd ctl file.
I don´t remember which ones are the strings (see the man, probably) but
I remember you can enable debug flags without restarting it.

You could try to locate them and enable debug for that, plug the disk
again, disable
debug for that.

IIRC, that is.

On Thu, Jan 12, 2012 at 12:25 PM, Richard Miller <9fans@hamnavoe.com> wrote:
>> /dev/usb/ep4.0 lun 0: inquiry Generic Flash Disk      8.07 geometry 8007680 512
>>
>> ... so I'd think this is ok ...
>
> My next step would be to get more diagnostic output from usb/disk.
> This is no longer easy with the new monolithic usb driver
> architecture.  You can't just start 'usb/disk -d' because the usb/disk
> embedded into usb/usbd will have started automatically and seized
> control of the device when you plugged it in.
>
> I think you will need to generate a new usbd with the disk driver
> configured out (see /sys/src/cmd/usb/usbd/usbdb), then kill the usbd
> which is embedded into the kernel and start your new one, before
> running usb/disk.
>
>

Re: [9fans] usb flash drive with ext2

[Richard Miller]

> you can enable debug diagnostics for devices by using the usbd ctl file.

Sorry, I wasn't aware of that.  usbd(4) does describe setting
environment variables in plan9.ini to change the arguments for usb
drivers (I wasn't aware of that either), but doesn't mention that you
can also do it dynamically via usbdctl.  For example

  echo diskargs -d >/dev/usbdctl

before plugging in the device (or -dd, -ddd etc for more verbosity).
You may need to study the source of usb/disk to make sense of the
output.