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

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Message-Id: <201009060255.o862t8rZ004494@demeter1.kernel.org>
Date:	Mon, 6 Sep 2010 02:55:08 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 17872] ext4 does not honour chattr +s attribute

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


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

           What    |Removed                     |Added
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                 CC|                            |adilger.kernelbugzilla@...g
                   |                            |er.ca




--- Comment #1 from Andreas Dilger <adilger.kernelbugzilla@...ger.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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