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I think the main reason it didn't take off until recently was because the kernel namespacing[0] work wasn't complete. Then, even when user namespacing was mostly complete, XFS still wasn't compatible until 3.12 [1].

[0] http://lwn.net/Articles/531114/

[1] http://www.phoronix.com/scan.php?page=news_item&px=MTQ1Nzc

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Early implementations were quite buggy; I tried it in 2010 after a presentation at linux.conf.au and found that the tools simply segfaulted with monotonous regularity on a then up-to-date environment. It's made significant strides since then, obviously.

Ah good point. That might explain it.

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