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filesystem driver -- how to prevent remount?

Writing a file system driver. Would like to prevent multiple mounts over the same mountpoint. Prior to 2.5 the dentry structure had a d_covers field that pointed at the mountpoint. You could check that against the requested mountpoint to see if it was already in use.

I would rather not test the path of the device being mounted, because it could possibly be mounted elsewhere, I want to test the mountpoint so it is not overloaded with multiple mounts.

How do you do this without the now missing d_covers field?

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