Probably a stupid question:

Why can I

 mount_union -b /src /usr/src

but can NOT

 mount_union -b /src /home/src

?  I get "mount_union: Operation not supported" from the second command.

Both /home and /usr are local FFS partitions.  The only difference I can
see is that /home has userquota enabled while /usr hasn't.  /src is NFS
mounted from another machine (yeah, lack of disk space).

  -jm

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