Re: Bug#561225: coreutils: cp --reflink fails with Btrfs file system

[Pádraig Brady]

On 15/12/09 13:00, Jim Meyering wrote:
> Jason White wrote:
> > Package: coreutils
> > Version: 8.0-2
> >
> > address@hidden:~$ touch testfile
> > address@hidden:~$ cp --reflink testfile testfile2
> > cp: failed to clone `testfile2': Invalid argument
> >
> > I am running kernel 2.6.32 with a Btrfs root file system under KVM, x86-64
> > architecture.
> >
> > It was suggested on the Btrfs mailing list that I test file cloning by running
> > the bcp demonstration script provided as part of btrfs-progs (available from
> > a Btrfs Git repository). In my test, bcp was able to clone a file,
> > suggesting that this may be a Coreutils bug rather than a kernel issue.

Note the bcp python script silently falls back to a standard copy,
so may be hiding the issue. Note you can get that behaviour with cp like:

cp --reflink=auto testfile testfile2

cheers,
Pádraig.