Ethan Yonker 7e94158684 Support both old and new mkfs.f2fs ...

Easiest way I could find to determine if we have the old or the
new mkfs.f2fs version is to pipe the usage output to grep and
grep the output for "reserved" and redirect the output to a file.
If the file has any data in it, then we must have the old
mkfs.f2fs that uses -r.

Change-Id: I7f1ed88b577a3f9827a98f0868d8f82e4e4886ac

2019-03-22 08:18:24 -05:00

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