linux-ext4 - [Bug 92271] Provide a way to really delete files, please

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Message-ID: <bug-92271-13602-i0VFjOm8ME@https.bugzilla.kernel.org/>
Date:	Thu, 29 Jan 2015 21:20:00 +0000
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 92271] Provide a way to really delete files, please

https://bugzilla.kernel.org/show_bug.cgi?id=92271

Eric Sandeen <sandeen@...hat.com> changed:

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

--- Comment #6 from Eric Sandeen <sandeen@...hat.com> ---
As long as you don't truncate the file first, overwriting an existing ext4 file
will indeed overwrite the existing blocks allocated to that file.  Ext4 is not
a copy on write filesystem.

FWIW, recent kernels and recent util-linux also have "fstrim --secure" to issue
a secure discard post-deletion.

-Eric

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