[PATCH] ext3: zero freed blocks
Andreas Dilger
adilger at clusterfs.com
Sat Sep 9 00:26:28 UTC 2006
On Sep 08, 2006 16:10 -0400, Theodore Tso wrote:
> Ideally, this wouldn't be done as a mount-time option, but rather only
> if the secure_delete flag is set on the file. That way you don't do
> it for all files, but just those that need to be zeroed.
Agreed.
> The patch also has the potential danger that the data blocks are
> getting zeroed before the transaction which contains the unlink has
> committed. There is therefore the risk that the system might crash
> after the blocks have been zero'ed, but before transaction has
> committed. In that case, the file will still be there, but some or
> all of its contents will be zero'ed.
That might be considered a feature.
Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.
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