https://bugs.kde.org/show_bug.cgi?id=440146

            Bug ID: 440146
           Summary: Show unusable disk space reserved for reserved blocks,
                    inode blocks
           Product: partitionmanager
           Version: 21.04.3
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: andr...@stikonas.eu
          Reporter: glifwen...@gmail.com
  Target Milestone: ---

Created attachment 140248
  --> https://bugs.kde.org/attachment.cgi?id=140248&action=edit
Partition properties

SUMMARY
Show unusable disk space reserved for reserved blocks, inode blocks in
partition properties window of KDE Partition Manager for applicable filesystems
like ext4 etc.

On my PC for /dev/sda2 ext4 partition of 867.39 GiB, the reserved block count
is "11368998*4096 bytes= 46567415808 bytes= 43.3693 gibibytes", inode count is
"56852480*256 bytes=14554234880 bytes= 13.5547 gibibytes" which is lot of disk
space.

If above unusable disk space is shown in properties of a specific partition,
then users can know where the disk space is utilized & can atleast modify the
reserved block count, also when reinstalling the OS. New users can find this
feature helpful.

Also the partition properties of /dev/sda2 in KDE Partition Manager shows
available disk space as 68.46 GiB, which includes reserved block usage etc, but
actual usable free disk space is 10.4 GiB. Please see the attached screenshot.
I am not sure everything above is correct.

EXPECTED RESULT
Show disk space utilized by Reserved blocks, Inode blocks, Journal blocks etc.
or show it as filesystem reserved disk space in partition properties of KDE
Partition Manager.

SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.22
KDE Plasma Version: 5.22.3
KDE Frameworks Version: 5.84.0
Qt Version: 5.15.3
Kernel Version: 5.8.0-63-generic (64-bit)
Graphics Platform: X11
Processors: 4 × Intel® Core™ i3-5010U CPU @ 2.10GHz
Memory: 3.8 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 5500

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