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

[Jason White]

Jim Meyering <address@hidden> wrote:
> Can you rerun that via strace and send the log at least
> to the bug-coreutils list (Cc'd)?
> 
>     strace -o log cp --reflink testfile testfile2

It opens both files and then performs the ioctl() call:
ioctl(4, 0x40049409, 0x3)               = -1 EINVAL (Invalid argument)

> 
> Even better, can you do that using stock upstream coreutils-8.2,
> assuming it still fails?

This may not be necessary. If I run strace on bcp, it turns out that its
ioctl() call encounters the same error:

ioctl(3, 0x40049409, 0x4)               = -1 EINVAL (Invalid argument)
and thus the suggestion that bcp (by behaving like --reflink=auto) is masking
the issue appears to be exactly on point.

cp.log
Description: Text document