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From: Chris Mason <chris.mason@oracle.com>
To: John Stoffel <john@stoffel.org>
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [ANNOUNCE] Btrfs: a copy on write, snapshotting FS
Date: Wed, 13 Jun 2007 12:34:05 -0400	[thread overview]
Message-ID: <20070613163405.GE28279@think.oraclecorp.com> (raw)
In-Reply-To: <18032.5991.475110.794691@stoffel.org>

On Wed, Jun 13, 2007 at 12:12:23PM -0400, John Stoffel wrote:
> >>>>> "Chris" == Chris Mason <chris.mason@oracle.com> writes:

[ nod ]

> Also, I think you're wrong here when you state that making a snapshot
> (sub-volume?) RO just requires you to set the quota to 1 block.  What
> is to stop me from writing 1 block to a random file that already
> exists?  

It's copy on write, so changing one block means allocating a new one and
putting the new contents there.  The old blocks don't become available
for reuse until the transaction commits.

-chris


  reply	other threads:[~2007-06-13 16:38 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-06-12 16:10 [ANNOUNCE] Btrfs: a copy on write, snapshotting FS Chris Mason
2007-06-12 19:53 ` Mike Snitzer
2007-06-12 20:14   ` Chris Mason
2007-06-13  3:08     ` Christoph Hellwig
2007-06-13 10:17       ` Chris Mason
2007-06-13  3:46 ` John Stoffel
2007-06-13 10:35   ` Chris Mason
2007-06-13 14:00     ` John Stoffel
2007-06-13 14:54       ` Chris Mason
2007-06-13 16:12         ` John Stoffel
2007-06-13 16:34           ` Chris Mason [this message]
2007-06-13 16:25         ` Grzegorz Kulewski
2007-06-14 18:20   ` Chuck Lever
2007-06-14 18:48     ` Chris Mason
2007-06-15 17:17       ` Chuck Lever
2007-06-18 14:41 ` Chris Mason
2007-06-18 17:37 ` Vladislav Bolkhovitin
2007-06-18 20:08   ` John Stoffel
2007-06-19  9:11   ` Pádraig Brady
2007-06-19 10:01     ` Vladislav Bolkhovitin
2007-06-19 18:20       ` david
2007-06-20  8:41         ` Vladislav Bolkhovitin
2007-06-19 12:04     ` Chris Mason
2007-06-19 14:00       ` Vladislav Bolkhovitin
2007-06-19 18:24       ` david
2007-06-19 18:28       ` Philipp Matthias Hahn
2007-06-20  8:44         ` Vladislav Bolkhovitin
2007-06-20  9:18           ` Ph. Marek
2007-06-13  5:45 Albert Cahalan
2007-06-13 12:00 ` Chris Mason
2007-06-13 16:14   ` Albert Cahalan
2007-06-13 16:57     ` Chris Mason
2007-06-14  6:59       ` Albert Cahalan
2007-06-14 12:30         ` Chris Mason

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