linux-ext4 - [Bug 15420] New: EXT4_USE_FOR_EXT23 causes wrong free space calculation on ext2 and ext3

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Date:	Mon, 1 Mar 2010 18:18:34 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 15420] New: EXT4_USE_FOR_EXT23 causes wrong free space
 calculation on ext2 and ext3

http://bugzilla.kernel.org/show_bug.cgi?id=15420

           Summary: EXT4_USE_FOR_EXT23 causes wrong free space calculation
                    on ext2 and ext3
           Product: File System
           Version: 2.5
    Kernel Version: 2.6.33
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@...nel-bugs.osdl.org
        ReportedBy: thomas@...hlinux.org
        Regression: No


When enabling the EXT4_USE_FOR_EXT23 option in 2.6.33. The free space
calculation on ext2 and ext3 becomes incorrect. Steps to reproduce:

1) Create ext2 or ext3 file system with mkfs
2) Mount it on a kernel with EXT4_USE_FOR_EXT23 enabled
3) Launch "watch -n1 df -h /path/to/mountpoint" in another terminal
4) Download a file with wget

The "used space" on the ext2/3 will now increase by about 500MB per second.
Once you stop the download and type "sync" (or wait for a while), the values
shown for free/used space return to expected values. This is always
reproducible.

We can reproduce this on x86_32 and x86_64 with the Arch Linux distribution
kernel, as well as my own personal Core2-optimized 64 Bit kernel.

.config x86_32:
http://repos.archlinux.org/wsvn/packages/kernel26/trunk/config?rev=70484
.config x86_64:
http://repos.archlinux.org/wsvn/packages/kernel26/trunk/config.x86_64?rev=70484

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