From: Pavel Machek <pavel@suse.cz>
To: jim owens <jowens@hp.com>
Cc: linux-fsdevel@vger.kernel.org, Dave Chinner <david@fromorbit.com>,
Theodore Tso <tytso@mit.edu>,
Arjan van de Ven <arjan@infradead.org>,
Miklos Szeredi <miklos@szeredi.hu>,
hch@infradead.org, t-sato@yk.jp.nec.com,
akpm@linux-foundation.org, viro@ZenIV.linux.org.uk,
linux-ext4@vger.kernel.org, xfs@oss.sgi.com, dm-devel@redhat.com,
linux-kernel@vger.kernel.org, axboe@kernel.dk,
mtk.manpages@googlemail.com
Subject: Re: [PATCH 3/3] Add timeout feature
Date: Sun, 13 Jul 2008 14:06:02 +0200 [thread overview]
Message-ID: <20080713120602.GC7517@elf.ucw.cz> (raw)
In-Reply-To: <4874C3E8.20804@hp.com>
Hi!
> NEED - provide way for SAN and hardware raid storage to do
> its snapshot/copy function while the system was in-use and
> get an image that could mount cleanly. Without freeze, at
> a minimum we usually needed filesystem metadata recovery
> to run, worst case is completely unusable snapshits :)
>
> freezefs() is single-level:
>
> ENOTSUPPOTED - by any other fs
> EOK - done
> EINPROGRESS
> EALREADY
>
> As implemented, freezefs only ensures the metadata is
> consistent so the filesystem copy can mount anywhere.
>
> This means ONLY SOME metadata (or no metadata) is flushed and
> then all metadata updates are stopped. User/kernel writes
> to already allocated file pages WILL go to a frozen disk.
That's the difference here. They do write file data, and thus avoid
mmap()-writes problem.
...and they _still_ provide auto-thaw.
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:[~2008-07-13 12:05 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-30 12:24 [PATCH 3/3] Add timeout feature Takashi Sato
2008-07-01 8:10 ` Christoph Hellwig
2008-07-01 10:52 ` Alasdair G Kergon
2008-07-03 12:11 ` Takashi Sato
2008-07-03 12:47 ` Alasdair G Kergon
2008-07-03 22:11 ` [dm-devel] " Dave Chinner
2008-07-04 12:08 ` Takashi Sato
2008-07-03 14:45 ` Eric Sandeen
2008-07-07 11:07 ` Pavel Machek
2008-07-08 23:10 ` Dave Chinner
2008-07-08 23:20 ` Pavel Machek
[not found] ` <20080708232031.GE18195@elf.ucw.cz>
2008-07-09 0:52 ` Dave Chinner
2008-07-09 1:09 ` Theodore Tso
[not found] ` <20080709010922.GE9957@mit.edu>
2008-07-09 4:21 ` Brad Boyer
2008-07-09 6:13 ` Miklos Szeredi
2008-07-09 6:16 ` Christoph Hellwig
2008-07-09 6:22 ` Miklos Szeredi
2008-07-09 6:41 ` Arjan van de Ven
2008-07-09 6:48 ` Miklos Szeredi
2008-07-09 6:55 ` Arjan van de Ven
2008-07-09 7:08 ` Miklos Szeredi
2008-07-09 20:48 ` Pavel Machek
2008-07-09 7:13 ` Dave Chinner
2008-07-09 11:09 ` Theodore Tso
2008-07-09 11:49 ` Dave Chinner
[not found] ` <20080709114958.GV11558@disturbed>
2008-07-09 12:24 ` Theodore Tso
[not found] ` <20080709122401.GK9957@mit.edu>
2008-07-09 12:59 ` Olaf Frączyk
2008-07-09 13:57 ` Arjan van de Ven
2008-07-09 13:55 ` Arjan van de Ven
2008-07-09 13:58 ` jim owens
2008-07-09 14:13 ` jim owens
2008-07-13 12:06 ` Pavel Machek [this message]
2008-07-13 17:15 ` jim owens
2008-07-14 6:36 ` Pavel Machek
2008-07-14 13:17 ` jim owens
2008-07-14 13:12 ` Takashi Sato
2008-07-14 14:04 ` jim owens
2008-07-09 13:53 ` Arjan van de Ven
2008-07-09 6:59 ` Dave Chinner
2008-07-09 7:13 ` Miklos Szeredi
2008-07-09 7:33 ` Dave Chinner
2008-07-09 8:11 ` Miklos Szeredi
2008-07-09 11:15 ` Dave Chinner
2008-07-09 20:44 ` Pavel Machek
-- strict thread matches above, loose matches on Subject: below --
2008-09-08 11:53 Takashi Sato
2008-09-08 17:11 ` Christoph Hellwig
2008-09-25 21:06 ` Ric Wheeler
2008-09-26 8:52 ` Takashi Sato
2008-09-26 10:58 ` Ric Wheeler
2008-09-29 11:11 ` Takashi Sato
2008-09-26 12:35 ` Valdis.Kletnieks
2008-09-29 14:13 ` Christoph Hellwig
2008-09-29 14:36 ` Eric Sandeen
2008-09-29 14:37 ` Christoph Hellwig
2008-09-29 14:45 ` Eric Sandeen
2008-09-29 22:08 ` jim owens
2008-10-05 10:00 ` Pavel Machek
2008-10-09 10:12 ` Takashi Sato
2008-10-09 10:18 ` Christoph Hellwig
2008-08-18 12:28 Takashi Sato
2008-08-21 20:20 ` Andrew Morton
2008-08-22 18:16 ` Christoph Hellwig
2008-08-24 17:03 ` Oleg Nesterov
2008-08-29 9:39 ` Takashi Sato
2008-07-22 9:36 Takashi Sato
2008-06-24 7:00 Takashi Sato
2008-06-24 22:09 ` Andrew Morton
2008-06-27 11:33 ` Takashi Sato
2008-06-27 18:57 ` Andrew Morton
2008-06-29 23:13 ` Takashi Sato
2008-06-30 0:01 ` Andrew Morton
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