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

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Date:	Wed, 04 Feb 2015 14:07:46 +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 13:50 schrieb Alexander Holler:
> 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).

Maybe I should mention that I've tried it with bug reports instead 
patches before. Beeing aware that I might be unable to write perfect 
patches with the resources I'm able or willing to spend.

I just needed some days until the one for ext4 was closed, leaving no 
hope that it might become fixed without trying it myself.

Alexander Holler

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