kevans
eaf5615c2e
mdmfs(8): add -k skel option to populate fs from a skeleton ...
mdmfs(8) lacks the ability to populate throwaway memory filesystems from an
existing directory.
This features permits an interesting setup where /var for instance lives on
a device where wear-leveling is something you want to avoid as much as
possible and nonetheless you don't want to lose your logs, ports metadata,
etc. Here are the steps:
1. Copy /var to /var.bak;
2. Mount an mfs into /var using -k /var.bak at startup;
3. Synchronize /var to /var.bak weekly and on shutdown.
Note that this more or less mimics OpenBSD's mount_mfs(8) -P flag.
PR: 146254
Submitted by: jlh (many moons ago)
MFC after: 1 week
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eaf5615c2e