https://bugs.kde.org/show_bug.cgi?id=397605
--- Comment #2 from Laurent Bonnans <laurent.bonn...@here.com> ---
I've sent a patch to handle FICLONE correctly. It seems to me that the ioctl
definition in Linux's uapi is misleading because it is set with a write
direction but do not use the argument as a pointer (it is a file descriptor).
Hence the error in the generic ioctl handler.
It can be tested by running this command on a btrfs filesystem (might do it
with another fs, haven't tested):
valgrind cp --reflink=always example.txt example_copy.txt
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