[dolphin] [Bug 479107] New: Dolphin does not Copy-on-Write ???? on Btrfs filesystems

[Landon Carbenia]

https://bugs.kde.org/show_bug.cgi?id=479107

            Bug ID: 479107
           Summary: Dolphin does not Copy-on-Write ???? on Btrfs
                    filesystems
    Classification: Applications
           Product: dolphin
           Version: 23.08.4
          Platform: Manjaro
                OS: Linux
            Status: REPORTED
          Severity: task
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: landon.carbenia at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
On a copy-on-write filesystem like Btrfs, Dolphin duplicates the entire file(s)
on disk instead of just copying.

STEPS TO REPRODUCE
1. In Dolphin, copy a large directory to another location within the same Btrfs
filesystem.
2. Observe that it's taking an unacceptably long time and a lot of disk space &
throughput. Cancel the operation.
3. In a terminal, use cp to do the same copy operation.
4. Observe that it took all of four seconds, and used negligible extra
diskspace and throughput.

OBSERVED RESULT
Dolphin is wasting time and disk space.

EXPECTED RESULT
A copy-on-write filesystem is actually copy-on-write.

SOFTWARE/OS VERSIONS
Linux Version: 6.6.8-MANJARO (64-bit)
Manjaro Version: 23.1.1
KDE Plasma Version: 5.27.10
KDE Frameworks Version: 5.113.0
Qt Version: 5.15.11
Graphics Platform: X11

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