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From: Ensel Sharon <user@dhp.com>
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Subject: mount_nullfs removes (temporarily) schg flag from dir ... why ?
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If you set schg on a directory, and then make that directory the mount
point of a null_mount, the schg flag goes away.

When you unmount it, it returns.  Why is this ?

Would I see this behavior from mounting anything on that directory, or
just when mounting a null mount on it ?

Thanks.