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ffs: fix newly introduced LOR between mntfs vnode lock and topology lock
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Authored by kib on Nov 16 2021, 5:35 PM.
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Details

Summary
The mntfs vnode lock should be before topology, as established in
ffs_mountfs().  Extend the locked region in ffs_unmount().

Reported by:    markj

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Repository
rG FreeBSD src repository
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