[Bug 53741] New: Used block count in df output

[Bug 53741] New: Used block count in df output

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=53741

               URL: http://marc.info/?l=linux-ext4&m=136021915127138&w=2
           Summary: Used block count in df output
           Product: File System
           Version: 2.5
    Kernel Version: 2.6.32
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: low
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@kernel-bugs.osdl.org
        ReportedBy: mujeeb.adil@gmail.com
        Regression: No


I have an observation on EXT4 filesystem. I created filesystem of size
1TB, 4TB, and 7TB and then checked the output of df command.

df command showed the number of 1KB blocks used. The result was:
1TB: 204056
4TB: 198680
7TB: 181784

I performed the same on XFS and the result was:
1TB: 32928
4TB: 32928
7TB: 33024

EXT4 result shows with increasing filesystem size, the number of used
blocks decreased. This looks odd.

>From the linux-ext4 mailing list discussion
(http://marc.info/?l=linux-ext4&m=136021915127138&w=2), it seems to be a bug in
df reporting.

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[Bug 53741] Used block count in df output

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=53741


Eric Sandeen <sandeen@redhat.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sandeen@redhat.com




--- Comment #1 from Eric Sandeen <sandeen@redhat.com>  2013-02-13 05:21:01 ---
Specifically, I think this is a problem with the overhead calculations done in
the default "bsddf" freespace reporting, which tries to not count the
fundamental filesystem metadata blocks as "used".  With mount -o minixdf, which
is the straightforward "report all blocks used as used" mode, the df output
makes sense.

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[Bug 53741] Used block count in df output

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=53741

Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |alan@lxorguk.ukuu.org.uk
         Resolution|---                         |INVALID

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[Bug 53741] Used block count in df output

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=53741

Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

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