I was just thinking of a similar "feature request": one of the things I'm doing
is hosting vm's. I build a base vm with standard setup in a dedicated
filesystem, then when I need a new instance "zfs clone" and voila! ready to
start tweaking for the needs of the new instance, using a fraction of the
space. Until update time. It still saves space, but it would be nice if there
were a way to identify the common blocks. I realize it's a double whammy
because vms just look like big monolithic files to the base filesystem, whereas
normally you might simply look for identical files to map together (though the
regular clone mechanism seems to be block based), but something to think about
in the "nice to haves"...
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