freebsd-dev/sys/miscfs/union/README
Peter Wemm 5e5861b9c6 Import 4.4BSD-Lite2 onto the vendor branch, note that in the kernel, all
files are off the vendor branch, so this should not change anything.

A "U" marker generally means that the file was not changed in between
the 4.4Lite and Lite-2 releases, and does not need a merge.  "C" generally
means that there was a change.
[two new auxillary files in miscfs/union]
1996-03-11 19:29:25 +00:00

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If you plan on using union mounts, then you should consider replacing
three files in "libc/gen" in the C library with the files in "libc"
in this directory. The replacement version of opendir() automatically
removes duplicate names when a union stack is encountered. The other
two files do special handling of whiteouts. You will then need to
rebuild the C library and all commands.
@(#)README 8.2 (Berkeley) 11/4/94