Hi all,

On my embedded ARM platform I try to set up an USB "device" which contains the file/folder structure of an UPnP Server.
A USB host (e.g. the Windows PC) should be able to view the contents of the UPnP Server.

To accomplish this I tried the following:

- I successfully use FUSE+DJMount to mount an Upnp-Server to a userspace directory (/tmp/upnp).
- I successfully load the Kernel Module "g_file_storage.ko" with e.g. "file=/dev/sda1" to set up a USB device (with die filesystem of a USB stick, connected to the ARM dev. board).

BUT: When I try to load the Kernel Module "g_file_storage.ko" with my userspace directory "file=/tmp/upnp" it comes to the following error message:

insmod: cannot insert '../g_file_storage.ko': Is a directory (-1): Is a directory
modprobe: failed to load module g_file_storage

In the documentation of the Kernelmodule g_file_storage it says that only block devices or single files (partitions) can be loaded. So this explains why modprobe fails!

Now I'm looking for a way to either mount my "tmp/upnp" directory to a /dev/xyz device or to configure the Kernel module "g_file_storage" to support userspace directories...
Or, can my FUSE file system be found in the /dev tree?

I hope you can point me in the right direction,

Thanks in advance,
Robert

It took me a while to figure out your situation, but I think I've got it now. You're trying to make your Linux host into a giant thumb drive, right? Since the USB Gadget API binds the USB to a block device, and your Fuse filesystem is really a 'fake' filesystem, there is no block device to which the USB Gadget can bind. Sounds to me like you're hooped, unless you convert your Fuse filesystem to a bona fide block device running in kernel space. Too bad; it would have been a nice way to accomplish your objective.
--- rod.

Hi thNbomr,

thanks for your answer, you got my situation completely right!
Since there are a lot of applications which use FUSE as virtual Filesystem I thought it would be a good approach to connect it to the USB Gadget API!

As you got my situation right, can you think of another solution to my problems?

I can't believe that there is no FUSE to /dev "wrapper" ...

Thanks,
Robert

no more answers? thx.

Sorry, I just don't see your approach working. A filesystem is not a block device. Maybe somewhere out there is a "Block Device in User Space" package. If not, here's your chance for fame and glory. :-)
--- rod.

HI，Robert：

Now，I have the same problems with you? Didn't you fix it?
Thanks!