Matan Ziv-Av wrote:
insmod unionfs.ko
mount -t unionfs -o dirs=/media/mmc1/usr=rw:/usr=ro unionfs /usr

to startup scripts (early enough) before anything opens a file for writing under
/usr.

See here:

http://www.linux-live.org/unionfs/


Would unionfs allow a single file to span two directories/partitions?

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