Re: ext3 and undeletion

H. Peter Anvin
2002-02-26T16:55:51Z

Followup to: <20020226164036.GG4393@matchmail.com>
By author: Mike Fedyk <mfedyk@matchmail.com>
In newsgroup: linux.dev.kernel
>
> Uhh, no.
>
> You have a configurable size for the undelete dirs and you delete a file.
> Now, that file gets moved to $mountpoint/.undelete. The daemon gets
> notified through a socket, and it can check to see if it needs to delete any
> older deleted files to make sure .undelete doesn't get bigger than
> configured.
>
> We're only scanning the dirs upon daemon startup (reminds me of
> quota... ;), and all other daemon actions are triggered by unlink() writing
> to a socket. The worst thing that can happen is not seeing your free space
> immediately, but a few seconds later.
>

Hence race condition. Also, the solution to hard-reserve space seems
to fundamentally defeat the purpose (IMO).

-hpa
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