[PATCH] shm fs v2 against 2.3.41

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Hi Folks,

Here is my newest version of shm over a filesystem:

Changes to the previous versio:

- It does not try to autodetect the path any more. Per default it
  expects to be mounted at /var/shm. If you mount it somewhere else,
  put the new path into /proc/sys/kernel/shmpath
- No more /proc/sys/kernel/{shmall,shmmni}. Use mount options
  nr_blocks and nr_pages. You can change these parameters with remount.
- You can set the initial mode of the directory with mount option 'mode'.
- It frees all objects on umount.

I tested the shm fs heavily on 2.3.40+some patches to make smp and
page_cache stable. It survived one day swap test.

Greetings
          Christoph

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