mount_mfs(8) on FreeBSD
The text 270d968bec9e, as FreeBSD 12.0-RELEASE shipped it.
configure and mount an in-memory file system using the md(4) driver or the tmpfs(5) filesystem
Flags it lists
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-D -
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-a -
-b -
-c -
-d -
-e -
-f -
-i -
-l -
-m -
-n -
-o -
-p -
-s -
-t -
-v -
-w