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I would like to create a virtual device from a directory i.e. you know, there's these cloud storage providers like dropbox and co and they generally have a software client and then give you access to files saved with them in a certain directory in your home directory. Now I would like to, instead being able to access the files in a directory, I would like to be able to mount it anywhere and access the files like as if they were on a device. How can I create a virtual device like this using mknod

edit 1: I would like to mount multiple of these devices together in one directory using mhddfs (http://romanrm.ru/en/mhddfs) if possible

edit 2: I am trying it out with Ubuntu One and Dropbox and I have created ~/virtcld in my home and "mounted" both cloud directories like this: mhddfs ~/Dropbox/ ~/Ubuntu\ One/ ~/virtcld/ -o allow_other then I have created a bunch of test files in my virtualcd like time dd if=/dev/zero of=test13.bin bs=1024 count=1000000 but once my Dropbbox is filled up, the files do not start to upload to the ubuntu One directory instead...

  • Can you try expanding your question? I don't understand what you're trying to do? I'm with you on the Dropbox cloud part, not getting the reason you want to use mknod for anything? The directories that Dropbox exposes to you; you can export that directory using something like Samba or NFS to other systems if that's your angle. – slm Sep 24 '13 at 1:43
  • @slm, please see edit above – cerr Sep 24 '13 at 16:29
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There's a FUSE plugin for Dropbox and many other services. I don't see how mknod relates.

  • please see edit above – cerr Sep 24 '13 at 16:30
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Given you're trying to make use of mhddfs to create a virtual directory of other directories it seems like you should be able to just provide the paths to Dropbox folders as arguments to it.

This is an example from the URL above:

$ mhddfs /mnt/hdd1,/mnt/hdd2,/mnt/hdd3 /mnt/virtual -o allow_other

These directories are the mounted devices, not the actual HDD's (/dev/sda1, etc.). So I would think something like this would do:

$ mhddfs /path/to/Dropbox1 /path/to/Dropbox2 /mnt/virtDropbox -o allow_other

UPDATE #1

In doing additional research I do not think you'll be able to use Dropbox with mhddfs. Dropbox apparently needs the filesystem to support the ability to provide hardlinks which mhddfs seems not to.

excerpt Using Dropbox With Your Seedbox To Download Torrents

[Why you need this step: If you try to install Dropbox the prescribed way (http://wiki.dropbox.com/TipsAndTricks/TextBasedLinuxInstall) it will fail. This is because your home directory on BigSB is mounted with mhddfs. mhddfs doesn't support hard links, which Dropbox needs.]

The same thing is echoed here in the Dropbox Forums - Problems installing on Linux

However, I was able to get this working after realizing that my server provider had mounted /home with mhddfs file system (which does not support hard links) After accessing the underlying drive I was able to extract the tarball and run dropbox just fine

  • please see edit 2 above... any more suggestions? – cerr Sep 24 '13 at 22:42

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