linux-kernel - Re: UBIFS seekdir()/telldir() issue

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Message-ID: <20080602081428.GA30613@duck.suse.cz>
Date:	Mon, 2 Jun 2008 10:14:28 +0200
From:	Jan Kara <jack@...e.cz>
To:	Adrian Hunter <ext-adrian.hunter@...ia.com>
Cc:	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>,
	Christoph Hellwig <hch@...radead.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: UBIFS seekdir()/telldir() issue

On Fri 30-05-08 13:57:45, Adrian Hunter wrote:
> Jan Kara wrote:
>>   The sequence you write above is actually incorrect I think. Noone
>> guarantees that the cookie returned by telldir() is valid after
>> closedir(). What is a bigger (and quite common) problem is, if somebody
>> uses readdir/telldir/seekdir while someone else creates/deletes files in
>> the directory. The standard implies in this case that subsequent
>> readdir should return all the files which were not touched (or all files
>> after position set by seekdir if used...).
>
> Not according to this:
>
> http://www.opengroup.org/onlinepubs/009695399/functions/readdir.html
>
> 	"If a file is removed from or added to the directory after the
> 	most recent call to opendir() or rewinddir(), whether a
> 	subsequent call to readdir() returns an entry for that file
> 	is unspecified."
  This is exactly what I meant. Maybe phrased it wrongly in my email :)

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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