Re: Magic Number for New File system

[Mike Waychison]

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Bhattiprolu, Ravikumar (Ravikumar) wrote:
> Hi All,
> 
> We are planning to write a new file system for our requirements. Is
> there any standard way to allocate a magic number for this new file
> system?

Have a cat walk across your numpad.  The value is pretty meaningless
other than as a unique identifier for your fstype. See statfs(2) for a
list of known MAGIC numbers.

> Also how to go about writing the new file system?
> 

For a block device backed fs, see fs/minix/* for a simple enough
example.  Another good example for a much simpler fs is fs/ramfs/inode.c

- --
Mike Waychison
Sun Microsystems, Inc.
1 (650) 352-5299 voice
1 (416) 202-8336 voice

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