Some places, I see people say, that nilfs is a copy-on-write filesystem.
But when I try to copy a file inside nilfs, using reflinks, this happens:
$ cp --reflink=always README.txt README2.txt
cp: failed to clone 'README2.txt' from 'README.txt': Operation not supported
Normal copying works fine:
$ cp --reflink=never README.txt README2.txt
So it looks like nilfs doesn't support copy-on-write, where you can copy
a file
without using extra space. E.g. copying a 5 GB file won't take 5 GB of
free space.
Is this a bug or just a missing feature, that could be implemented in
the future?
