filesystem differentiation

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given different harddisk partition, does anyone knows how to
differentiate one partition from another?

at the kernel source level, which is the constant/variable for this?

Is it EXT3_XATTR_MAGIC?   (but EXT2_XATTR_MAGIC have the same value as
ext3, so betw the two they are not distinguisable?)
(or REISERFS_XATTR_MAGIC etc)   So I supposed if I were to create my
new filesystem, then just create a new /random value from this?

-- 
Regards,
Peter Teoh

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