From: Pavel Machek <pavel@ucw.cz>
To: Ric Wheeler <rwheeler@redhat.com>
Cc: Artem Bityutskiy <dedekind@yandex.ru>,
Artem Bityutskiy <Artem.Bityutskiy@nokia.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: replace() system call needed (was Re: EXT4-ish "fixes" in UBIFS)
Date: Tue, 31 Mar 2009 00:11:52 +0200 [thread overview]
Message-ID: <20090330221152.GD17800@elf.ucw.cz> (raw)
In-Reply-To: <49D0FF1E.3010804@redhat.com>
Hi!
>> My proposal is
>>
>> rename() stays.
>>
>> replace(src, bar) is rename that ensures that bar will contain valid
>> data after powerfail.
>>
>
> Surely the only way to "insure" this is to spin up the drive, write the
> meta-data and data back and make sure that it is not held in volatile
> write cache?
Well, no. "will contain valid data" but may contain _old_ valid data.
So the way to do that would be "wait until you have to spin disk up
anyway or until timeout, then write data first, then do rename".
AFAICT that's semantics gnome (etc) wants.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2009-03-30 22:12 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-27 12:48 EXT4-ish "fixes" in UBIFS Artem Bityutskiy
2009-03-28 1:22 ` Kyungmin Park
2009-03-29 12:31 ` Artem Bityutskiy
2009-03-29 12:54 ` Artem Bityutskiy
2009-03-29 12:26 ` replace() system call needed (was Re: EXT4-ish "fixes" in UBIFS) Pavel Machek
2009-03-29 12:42 ` Artem Bityutskiy
2009-03-29 12:50 ` Pavel Machek
2009-03-29 13:00 ` Artem Bityutskiy
2009-03-29 13:02 ` Pavel Machek
2009-03-29 13:07 ` Artem Bityutskiy
2009-03-29 13:22 ` Andreas T.Auer
2009-03-29 13:55 ` Artem Bityutskiy
2009-03-29 13:40 ` Pavel Machek
2009-03-29 13:57 ` Artem Bityutskiy
2009-03-29 14:00 ` Pavel Machek
2009-03-30 17:19 ` Ric Wheeler
2009-03-30 22:11 ` Pavel Machek [this message]
2009-03-29 13:01 ` Andreas T.Auer
2009-03-29 13:06 ` Artem Bityutskiy
2009-03-30 15:58 ` Diego Calleja
2009-04-03 0:09 ` EXT4-ish "fixes" in UBIFS Christian Kujau
2009-04-03 0:24 ` Trenton D. Adams
2009-04-03 0:28 ` Trenton D. Adams
2009-04-03 0:38 ` Christian Kujau
2009-04-03 0:54 ` Trenton D. Adams
2009-04-03 0:54 ` Trenton D. Adams
2009-04-03 0:59 ` Trenton D. Adams
2009-04-03 1:55 ` David Rees
2009-04-03 2:05 ` Trenton D. Adams
2009-04-03 2:19 ` David Rees
2009-04-03 2:28 ` Trenton D. Adams
2009-04-03 2:58 ` David Rees
2009-04-03 3:13 ` Trenton D. Adams
2009-04-03 3:14 ` Trenton D. Adams
2009-04-03 5:02 ` Theodore Tso
2009-04-03 5:15 ` Trenton D. Adams
2009-04-03 6:30 ` Theodore Tso
2009-04-03 18:53 ` Chris Adams
2009-04-03 18:05 ` David Rees
2009-04-09 20:17 ` Pavel Machek
2009-04-03 2:26 ` Trenton D. Adams
2009-04-03 2:05 ` Theodore Tso
2009-04-03 2:45 ` Christian Kujau
2009-04-03 2:49 ` Trenton D. Adams
2009-04-03 6:53 ` Artem Bityutskiy
[not found] <ckjPq-2Dl-15@gated-at.bofh.it>
[not found] ` <cl2jy-65z-1@gated-at.bofh.it>
[not found] ` <cl2CZ-6q2-21@gated-at.bofh.it>
[not found] ` <cl2N9-6Bj-9@gated-at.bofh.it>
2009-03-31 21:27 ` replace() system call needed (was Re: EXT4-ish "fixes" in UBIFS) Bodo Eggert
2009-04-01 0:06 ` Theodore Tso
2009-04-01 20:52 ` Pavel Machek
2009-04-01 22:58 ` Bodo Eggert
[not found] <cmFiD-8uc-9@gated-at.bofh.it>
[not found] ` <cmFss-ft-15@gated-at.bofh.it>
[not found] ` <cmFsu-ft-23@gated-at.bofh.it>
[not found] ` <cmGRt-2hq-7@gated-at.bofh.it>
[not found] ` <cmH1b-2K0-11@gated-at.bofh.it>
[not found] ` <cmHkz-3d3-5@gated-at.bofh.it>
[not found] ` <cmHkA-3d3-7@gated-at.bofh.it>
[not found] ` <cmHND-3Oz-5@gated-at.bofh.it>
[not found] ` <cmJPm-7hd-5@gated-at.bofh.it>
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