From: Jeff Garzik <jeff@garzik.org>
To: Kay Sievers <kay.sievers@vrfy.org>
Cc: Chris Mason <chris.mason@oracle.com>,
Andrew Morton <akpm@linux-foundation.org>,
Christoph Hellwig <hch@infradead.org>,
adilger@sun.com, sfr@canb.auug.org.au,
linux-kernel@vger.kernel.org, linux-btrfs@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Subject: Re: Notes on support for multiple devices for a single filesystem
Date: Wed, 17 Dec 2008 16:27:58 -0500 [thread overview]
Message-ID: <49496EDE.5080101@garzik.org> (raw)
In-Reply-To: <ac3eb2510812171320i414d89d4x9840954275774d51@mail.gmail.com>
Kay Sievers wrote:
> Features like the very nice and useful directory-based snapshots would
> also not be possible with simple block-based multi-devices, right?
Snapshotting via block device has always been an incredibly dumb hack,
existing primarily because filesystem-based snapshots did not exist for
the filesystem in question.
Snapshots are better at the filesystem level because the filesystem is
the only entity that knows when the filesystem is quiescent and
snapshot-able.
ISTR we had to add ->write_super_lockfs() to hack in support for LVM in
this manner, rather than doing it the right way.
Jeff
next prev parent reply other threads:[~2008-12-17 21:27 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-20 12:18 Btrfs trees for linux-next Chris Mason
2008-12-11 2:34 ` Chris Mason
2008-12-11 3:14 ` Stephen Rothwell
2008-12-11 4:06 ` Andrew Morton
2008-12-11 5:55 ` Stephen Rothwell
2008-12-11 14:43 ` Chris Mason
2008-12-15 21:03 ` Andreas Dilger
2008-12-15 22:55 ` Kay Sievers
2008-12-16 1:37 ` Chris Mason
2008-12-16 1:39 ` Kay Sievers
2008-12-17 13:23 ` Notes on support for multiple devices for a single filesystem Christoph Hellwig
2008-12-17 14:50 ` Kay Sievers
2008-12-17 15:08 ` Christoph Hellwig
2008-12-17 15:33 ` Kay Sievers
2008-12-17 14:53 ` Chris Mason
2008-12-17 19:53 ` Andrew Morton
2008-12-17 20:58 ` Chris Mason
2008-12-17 21:20 ` Kay Sievers
2008-12-17 21:26 ` Chris Mason
2008-12-17 21:27 ` Jeff Garzik [this message]
2008-12-18 21:22 ` Bryan Henderson
2008-12-17 21:24 ` Andreas Dilger
2008-12-17 21:30 ` Jeff Garzik
2008-12-17 21:41 ` Chris Mason
2008-12-22 1:59 ` Liu Hui
2008-12-17 22:04 ` Andreas Dilger
2008-12-17 22:19 ` Dave Kleikamp
[not found] <e1f6055f0812181336q105b4ebcy81d72edd2a35baa8@mail.gmail.com>
2008-12-19 19:03 ` Bryan Henderson
2008-12-19 19:30 ` Chris Mason
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