linux-kernel - Re: [PATCH 1/5] WIP: Add syscall unlinkat

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Message-ID: <54D21586.3030302@ahsoftware.de>
Date:	Wed, 04 Feb 2015 13:50:14 +0100
From:	Alexander Holler <holler@...oftware.de>
To:	Lukáš Czerner <lczerner@...hat.com>
CC:	Al Viro <viro@...IV.linux.org.uk>, Theodore Ts'o <tytso@....edu>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] WIP: Add syscall unlinkat_s (currently x86* only)

Am 04.02.2015 um 13:42 schrieb Alexander Holler:
> Am 04.02.2015 um 13:22 schrieb Alexander Holler:
>> Am 04.02.2015 um 13:07 schrieb Lukáš Czerner:
>>
>>> The fact is that the current patches are useless for anything other
>>> than proof-of-concept. Now you know more that needs to be done or
>>
>> That's wrong. The patches already work. If you delete a file which isn't
>> in use by something else, the current contents will be wiped on
>> traditional harddrives. I assume that already fulfills more than 50% of
>> use cases of ordinary people.
>>
>>> thought about, but if you're not willing to do the work, then please
>>> stop complaining about "high towers". I am not a maintainer and I
>>> thinks that the feedback you've got is entirely reasonable. Take it
>>> as you will.
>>>
>>> One more thing, can I ask you what were your expectations when
>>> posting those patches ?
>>
>> I've posted them for other users which are happy with what I've
>> explained above. Besides requesting an API which makes such a simple
>> solution, in contrast to the the 's' bit, possible.
>
> To be more precise: How do you add something like EXT2_IOC_[SG[ETFLAGS
> to vfat or one of the dozens other filesystems which don't know about
> linux-specific flags? I don't see a way to do that, so there's only
> unlinkat() left.

Or to be give an actual use case, mount a (v)fat formatted usb-stick, 
-hdd or mmc, delete a file with the patches I offered, unmount it, try 
to find the contents of the deleted file at device-level (e.g. by 
grepping the partition).

Alexander Holler

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