From: Hans Reiser <reiser@namesys.com>
To: Andrew Morton <akpm@osdl.org>
Cc: reiserfs-list@namesys.com, linux-kernel@vger.kernel.org
Subject: Re: precise characterization of ext3 atomicity
Date: Thu, 04 Sep 2003 19:59:50 +0400 [thread overview]
Message-ID: <3F576176.3010202@namesys.com> (raw)
In-Reply-To: <20030904085537.78c251b3.akpm@osdl.org>
Andrew Morton wrote:
>Hans Reiser <reiser@namesys.com> wrote:
>
>
>>Is it correct to say of ext3 that it guarantees and only guarantees
>>atomicity of writes that do not cross page boundaries?
>>
>>
>
>Yes.
>
>
>
>> By contrast, ext3 only guarantees the atomicity of a single write
>>that does not span a page boundary, and it guarantees that its internal
>>metadata will not be corrupted even if your applications data is
>>corrupted after the crash.
>>
>>
>
>Not sure that I understand this. In data=writeback mode, metadata
>integrity is preserved but data writes may be lost. In data=journal and
>data=ordered modes the data and the metadata which refers to it are always
>in sync on-disk.
>
>
>
>
>
Perhaps the following is correct?
By contrast, ext3 in data=journal and data=ordered modes only guarantees the atomicity of a single write
that does not span a page boundary, and it guarantees that its internal
metadata will not be corrupted even if your application's data is
corrupted after the crash (due to the application spreading what should be committed atomically across more than one block).
--
Hans
next prev parent reply other threads:[~2003-09-04 15:59 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-04 14:20 precise characterization of ext3 atomicity Hans Reiser
2003-09-04 15:55 ` Andrew Morton
2003-09-04 15:59 ` Hans Reiser [this message]
2003-09-04 16:12 ` Andrew Morton
2003-09-04 16:25 ` Hans Reiser
2003-09-04 18:15 ` Mike Fedyk
2003-09-04 16:05 ` Antonio Vargas
2003-09-04 18:37 ` Hans Reiser
2003-09-04 19:12 ` Mike Fedyk
2003-09-04 21:03 ` Hans Reiser
2003-09-04 19:28 ` Andreas Dilger
2003-09-04 21:32 ` Hans Reiser
2003-09-04 22:03 ` Andreas Dilger
2003-09-05 13:47 ` Chris Mason
2003-09-09 13:09 ` Pavel Machek
2003-09-09 19:21 ` Gábor Lénárt
2003-09-09 19:43 ` Mike Fedyk
2003-09-04 20:16 ` Daniel Phillips
2003-09-04 20:10 ` Andrew Morton
2003-09-04 21:08 ` Daniel Phillips
2003-09-04 21:39 ` Hans Reiser
2003-09-04 21:59 ` Daniel Phillips
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