udev & sysfs - differentiating between usb / scsi devices

udev & sysfs - differentiating between usb / scsi devices

[agonz054]

After exploring the /sys file system structure, I have noticed that:
when a USB flash drive is hooked into the system two new objects are
introduced: one is a usb_device and the other is a scsi_disk.

Is there any way to differentiate between SCSI disks? ( i.e. i want two
browse through the scsi_disks present in sysfs and be able to see which
are usb flash drives and which are really scsi disks)

So far I have noticed that for several USB flash memories, the vendor
field/file in sysfs will contain "USB Flash Memory", but this doesn't
seem like a good solution to this problem.

Thanks,

Andy.


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Re: udev & sysfs - differentiating between usb / scsi devices

[Alex Merry]

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On Sunday 19 November 2006 22:37, agonz054@cs.fiu.edu wrote:
> After exploring the /sys file system structure, I have noticed that:
> when a USB flash drive is hooked into the system two new objects are
> introduced: one is a usb_device and the other is a scsi_disk.
>
> Is there any way to differentiate between SCSI disks? ( i.e. i want
> two browse through the scsi_disks present in sysfs and be able to see
> which are usb flash drives and which are really scsi disks)
>
> So far I have noticed that for several USB flash memories, the vendor
> field/file in sysfs will contain "USB Flash Memory", but this doesn't
> seem like a good solution to this problem.

How about looking at the device link?

I have a usb pen drive plugged in that turns up as sda.  
So /sys/block/sda/device links to 
../../devices/pci0000:00/0000:00:03.2/usb3/3-6/3-6:1.0/host0/target0:0:0/0:0:0:0/

Obviously, this is a usb device.

Alex :-)

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