Hi,

How is the synchronization between ufs_unmount and other ufs
vnode ops achieved? That is, if an unmount is in progress, in what
layer do vnode ops start getting redirected to the root vnode's
file system instead of the now-being-unmounted file system?

Also, if one or more vnode ops are in progress, what makes
unmount wait (provided it is not a forced unmount) for this activity
to drain?

Thanks.
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