[Bug 31542] New: ext4 : "No space left on the device" persists even when I deleted more than 40GB of data

[Bug 31542] New: ext4 : "No space left on the device" persists even when I deleted more than 40GB of data

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31542

           Summary: ext4 : "No space left on the device" persists even
                    when I deleted more than 40GB of data
           Product: File System
           Version: 2.5
    Kernel Version: 2.6.37.2
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@kernel-bugs.osdl.org
        ReportedBy: tavvva@volny.cz
        Regression: No


1.) I recently filled my data partition full and got an error dialog, that
there's no space left on the device (Resume, Retry, Skip, Abort, ... don't
remember exactly)
2.) I used different terminal in order to move some of the big files (more than
40GB in total) from the affected partition to a different harddrive. But df was
still showing 0 bytes available.
3.) Even of that I tried to resume the copying mentioned in point 1.) and it
worked ... the copying was finished successfuly. What a magic!
4.) The situation changed after the reboot. I cannot copy new files to the
affected partition anymore even if there must be at least 30GB of space left.

This is what df returns:
-------------------------
Filesystem    1K-blocks    Used        Available    Use%    Mounted on
/dev/md6    1209519868    1175334268    0        100%    /mnt/data

The difference between total and used blocks gives more than 32GB and I'm sure
that yesterday this space was filled with data.

I'm willing to do any non-destructive tests and collect any debug logs You need
in order to find the root cause of this issue.

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[Bug 31542] ext4 : "No space left on the device" persists even when I deleted more than 40GB of data

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31542





--- Comment #1 from Jaromír Cápík <tavvva@volny.cz>  2011-03-20 23:27:10 ---
NOTE : Unfortunately I was performing the mentioned scenario on Mandriva Linux
with the latest Mandriva desktop kernel [2.6.33-7mnb2] (and I know You don't
like non-Vanilla kernels even if they almost don't differ from Vanilla), but I
truly believe, that this problem comes from the mainline and therefore it's
present in the mainline too. 

The issue persists even when I try Vanilla 2.6.37.2 ...

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[Bug 31542] ext4 : "No space left on the device" persists even when I deleted more than 40GB of data

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31542





--- Comment #2 from Jaromír Cápík <tavvva@volny.cz>  2011-03-20 23:39:36 ---
I just discovered, that I get "no space left" messages from user accounts only.
The root account can fill the rest of the space without sign of problems ....

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[Bug 31542] ext4 : "No space left on the device" persists even when I deleted more than 40GB of data

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31542





--- Comment #3 from Jaromír Cápík <tavvva@volny.cz>  2011-03-20 23:43:56 ---
Sorry ... this seems to be a feature I didn't know about ...

-> By default, 5% of the space on a filesystem is reserved for the root user.
This is so that if the filesystem fills up, there's still a little space for
root to come in and clean up the mess. You can change this percentage with the
-m option of tune2fs; do not do this while the filesystem is mounted and read
the manpage very carefully. This is a potentially dangerous operation.

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[Bug 31542] ext4 : "No space left on the device" persists even when I deleted more than 40GB of data

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31542


Jaromír Cápík <tavvva@volny.cz> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID




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[Bug 31542] ext4 : "No space left on the device" persists even when I deleted more than 40GB of data

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31542


Eric Sandeen <sandeen@redhat.com> changed:

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




--- Comment #4 from Eric Sandeen <sandeen@redhat.com>  2011-03-20 23:46:18 ---
That's right, you've run into the reserved-for-root space, which as you noted
above, can be changed...

So CLOSED/NOTABUG I think?

-Eric

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[Bug 31542] ext4 : "No space left on the device" persists even when I deleted more than 40GB of data

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31542


Jaromír Cápík <tavvva@volny.cz> changed:

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




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[Bug 31542] ext4 : "No space left on the device" persists even when I deleted more than 40GB of data

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31542





--- Comment #5 from Jaromír Cápík <tavvva@volny.cz>  2011-03-21 00:05:16 ---
Yep .... I've already resolved/closed.
But ... that points to the unintuitive df output, where the reserved part
should be displayed. At the moment I don't know if that's easily possible, but
I'll check that and create an enhancement ticket if so.

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