linux-kernel - Re: replace() system call needed (was Re: EXT4-ish "fixes" in UBIFS)

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Message-ID: <49CF761E.3030500@ursus.ath.cx>
Date:	Sun, 29 Mar 2009 15:22:38 +0200
From:	"Andreas T.Auer" <andreas.t.auer_lkml_73537@...us.ath.cx>
To:	Artem.Bityutskiy@...ia.com
CC:	Pavel Machek <pavel@....cz>, Artem Bityutskiy <dedekind@...dex.ru>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: replace() system call needed (was Re: EXT4-ish "fixes" in UBIFS)



On 29.03.2009 15:07 Artem Bityutskiy wrote:
> Pavel Machek wrote:
>>
>> Does not fsync. If someone wants to make sure one of the files is on
>> the disk, he should use replace(). [On non-linux systems, replace()
>> should be implemented as fsync/rename in libc or something.]
>
As a user I will avoid using any fs, which requires the tons of
applications to be changed for a reasonable amount of data safety.
> I would be happy with these rules. But the fact is, application
> people just refuse to add fsync before rename.
Because it slows down the performance.
> They say that the
> FS has to do this. 
They say that FS should not write metadata for non-existing data and
even overwrite "clean" metadata with "dirty" metadata. It is up to the
fs to decide, whether fsync is needed to achieve this.


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