From: jim owens <jowens@hp.com>
To: Jamie Lokier <jamie@shareable.org>
Cc: Chris Mason <chris.mason@oracle.com>, linux-fsdevel@vger.kernel.org
Subject: Re: btrfs O_DIRECT was [rfc] fsync_range?
Date: Wed, 21 Jan 2009 18:08:42 -0500 [thread overview]
Message-ID: <4977AAFA.7050503@hp.com> (raw)
In-Reply-To: <20090121215921.GG16133@shareable.org>
Jamie Lokier wrote:
>
> Writing in place or new-place on a *non-shared* (i.e. non-snapshotted)
> file is the choice which is useful. It's a filesystem implementation
> detail, not a semantic difference. I'm suggesting writing in place
> may do no harm and be more like the expected behaviour with programs
> that use O_DIRECT, which are usually databases.
>
> How about a btrfs mount option?
> in_place_write=never/always/direct_only. (Default direct_only).
The harm is creating a special guarantee for just one case
of "don't move my data" based on a transient file open mode.
What about defragmenting or moving the extent to another
device for performance or for (failing) device removal?
We are on a slippery slope for presumed expectations.
jim
next prev parent reply other threads:[~2009-01-21 23:08 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-20 16:47 [rfc] fsync_range? Nick Piggin
2009-01-20 18:31 ` Jamie Lokier
2009-01-20 21:25 ` Bryan Henderson
2009-01-20 22:42 ` Jamie Lokier
2009-01-21 19:43 ` Bryan Henderson
2009-01-21 21:08 ` Jamie Lokier
2009-01-21 22:44 ` Bryan Henderson
2009-01-21 23:31 ` Jamie Lokier
2009-01-21 1:36 ` Nick Piggin
2009-01-21 19:58 ` Bryan Henderson
2009-01-21 20:53 ` Jamie Lokier
2009-01-21 22:14 ` Bryan Henderson
2009-01-21 22:30 ` Jamie Lokier
2009-01-22 1:52 ` Bryan Henderson
2009-01-22 3:41 ` Jamie Lokier
2009-01-21 1:29 ` Nick Piggin
2009-01-21 3:15 ` Jamie Lokier
2009-01-21 3:48 ` Nick Piggin
2009-01-21 5:24 ` Jamie Lokier
2009-01-21 6:16 ` Nick Piggin
2009-01-21 11:18 ` Jamie Lokier
2009-01-21 11:41 ` Nick Piggin
2009-01-21 12:09 ` Jamie Lokier
2009-01-21 4:16 ` Nick Piggin
2009-01-21 4:59 ` Jamie Lokier
2009-01-21 6:23 ` Nick Piggin
2009-01-21 12:02 ` Jamie Lokier
2009-01-21 12:13 ` Theodore Tso
2009-01-21 12:37 ` Jamie Lokier
2009-01-21 14:12 ` Theodore Tso
2009-01-21 14:35 ` Chris Mason
2009-01-21 15:58 ` Eric Sandeen
2009-01-21 20:41 ` Jamie Lokier
2009-01-21 21:23 ` jim owens
2009-01-21 21:59 ` Jamie Lokier
2009-01-21 23:08 ` jim owens [this message]
2009-01-22 0:06 ` btrfs O_DIRECT was " Jamie Lokier
2009-01-22 13:50 ` jim owens
2009-01-22 21:18 ` Florian Weimer
2009-01-22 21:23 ` Florian Weimer
2009-01-21 3:25 ` Jamie Lokier
2009-01-21 3:52 ` Nick Piggin
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