linux-ext4 - [Bug 53741] New: Used block count in df output

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Message-ID: <bug-53741-13602@https.bugzilla.kernel.org/>
Date:	Wed, 13 Feb 2013 05:15:23 +0000 (UTC)
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 53741] New: Used block count in df output

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@...nel-bugs.osdl.org
        ReportedBy: mujeeb.adil@...il.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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