[Bug 17872] New: ext4 does not honour chattr +s attribute

[Bug 17872] New: ext4 does not honour chattr +s attribute

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=17872

           Summary: ext4 does not honour chattr +s attribute
           Product: File System
           Version: 2.5
    Kernel Version: 2.6.34
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@kernel-bugs.osdl.org
        ReportedBy: usedonlytosignup@gmail.com
        Regression: No


According to the man page setting this attribute will cause the files blocks to
be zero'd if it is deleted. It says it does this for ext2 and ext3 and does not
mention ext4, so I've marked it as "enhancement" though I think this is really
a bug.

Because it doesn't zero the blocks.

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[Bug 17872] ext4 does not honour chattr +s attribute

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=17872


Andreas Dilger <adilger.kernelbugzilla@dilger.ca> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |adilger.kernelbugzilla@dilg
                   |                            |er.ca




--- Comment #1 from Andreas Dilger <adilger.kernelbugzilla@dilger.ca>  2010-09-06 02:55:05 ---
Please read the man page carefully:

       When  a  file  with  the  ‘s’ attribute set is deleted, its blocks are
       zeroed and written back to the disk.  Note: please make sure  to  read
       the bugs and limitations section at the end of this document.
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

:
:
BUGS AND LIMITATIONS
       The ‘c’, ’s’,  and ‘u’ attributes are not honored by the ext2 and ext3
                                             ^^^
       filesystems  as  implemented  in  the  current mainline Linux kernels.
       These attributes may be implemented in future versions of the ext2 and
       ext3 filesystems.


I agree it is a bug that the _man_page_ doesn't also mention ext4 as NOT
zeroing out blocks when "+s" is used.

It makes me wonder why these "features" are mentioned in the man page at all,
since it never worked and there is no plan to make it work.  Since this
question comes up on a regular basis, it makes me wonder if it would be better
to just remove mention of these options until they are actually implemented. 
When they ARE implemented, they should list explicitly which filesystems DO
support those features, rather than redirecting to the end of the document.

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[Bug 17872] ext4 does not honour chattr +s attribute

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=17872





--- Comment #2 from Rob Fortune <usedonlytosignup@gmail.com>  2010-09-06 03:12:10 ---
My bad for missing the not. Your comment is spot on, mentioning non-existent
features is pointless. It should be done the way you suggested.

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[Bug 17872] ext4 does not honour chattr +s attribute

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https://bugzilla.kernel.org/show_bug.cgi?id=17872





--- Comment #3 from Rob Fortune <usedonlytosignup@gmail.com>  2010-09-06 03:12:30 ---
Pointless and confusing.

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[Bug 17872] ext4 does not honour chattr +s attribute

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=17872





--- Comment #4 from Rob Fortune <usedonlytosignup@gmail.com>  2010-09-06 03:16:43 ---
And apologies for the spammy third reply but a three to five pass random wipe
before zeroing them would be a much better feature than just zeroing them
anyway.

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[Bug 17872] ext4 does not honour chattr +s attribute

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=17872


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

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




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