From: Eric Sandeen <sandeen@redhat.com>
To: Andreas Dilger <adilger@sun.com>
Cc: Jamie Lokier <jamie@shareable.org>,
Mark Fasheh <mfasheh@suse.com>,
linux-fsdevel@vger.kernel.org, Andreas Dilger <adilger@shaw.ca>,
Kalpak Shah <Kalpak.Shah@sun.com>,
Josef Bacik <jbacik@redhat.com>
Subject: Re: [PATCH 0/4] Fiemap, an extent mapping ioctl - round 2
Date: Fri, 27 Jun 2008 23:21:36 -0500 [thread overview]
Message-ID: <4865BC50.2030804@redhat.com> (raw)
In-Reply-To: <20080627224843.GZ6239@webber.adilger.int>
Andreas Dilger wrote:
>> - The filesystem's internal representation may have _many_ more
>> extents than the contiguous layout. E.g. a 4GiB file might have
>> 65536 x 64kiB extents on some filesystem, or 1 extent when
>> merged. Is it ever useful to return the much larger list?
>
> It seems unlikely to consider this an "extent based" filesystem, and
> I'd treat it as a block-based filesystem internally and merge it...
> Yes, for ext4 it must split the extents at 128MB boundaries (1 group),
> but because of the on-disk metadata it isn't yet possible to allocate
> larger extents anyways.
aside: even w/ metadata out of the way the ext4 extent format is still
capped at 128M per extent right, even if they're contiguous. Which led
me to the little though experiment about hm, is this 1G file 1 extent or
8 and what should fiemap return...
-Eric
next prev parent reply other threads:[~2008-06-28 4:21 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-25 22:18 [PATCH 0/4] Fiemap, an extent mapping ioctl - round 2 Mark Fasheh
2008-06-26 3:03 ` Andreas Dilger
2008-06-26 9:36 ` Jamie Lokier
2008-06-26 10:24 ` Andreas Dilger
2008-06-26 11:37 ` Anton Altaparmakov
2008-06-26 12:19 ` Jamie Lokier
2008-06-26 13:16 ` Dave Chinner
2008-06-26 13:27 ` Jamie Lokier
2008-06-26 13:48 ` Eric Sandeen
2008-06-26 14:16 ` Jamie Lokier
2008-06-26 16:56 ` Andreas Dilger
2008-06-29 19:12 ` Anton Altaparmakov
2008-06-29 21:45 ` Dave Chinner
2008-06-30 22:57 ` Jamie Lokier
2008-06-30 23:07 ` Mark Fasheh
2008-07-01 2:01 ` Brad Boyer
2008-07-02 6:38 ` Andreas Dilger
2008-07-02 6:33 ` Andreas Dilger
2008-07-02 14:26 ` Jamie Lokier
2008-06-26 17:17 ` Andreas Dilger
2008-06-26 14:03 ` Eric Sandeen
2008-06-27 1:41 ` Dave Chinner
2008-06-27 9:41 ` Jamie Lokier
2008-06-27 10:01 ` Dave Chinner
2008-06-27 10:32 ` Jamie Lokier
2008-06-27 22:48 ` Andreas Dilger
2008-06-28 4:21 ` Eric Sandeen [this message]
2008-07-02 6:26 ` Andreas Dilger
2008-07-02 14:28 ` Jamie Lokier
2008-07-02 21:20 ` Mark Fasheh
2008-07-03 14:45 ` Jamie Lokier
2008-06-26 14:04 ` Dave Kleikamp
2008-06-26 14:15 ` Eric Sandeen
2008-06-26 14:27 ` Dave Kleikamp
2008-07-02 23:48 ` jim owens
2008-07-03 11:17 ` Dave Chinner
2008-07-03 12:11 ` jim owens
2008-07-03 22:51 ` Dave Chinner
2008-07-04 8:31 ` Andreas Dilger
2008-07-04 12:13 ` Jamie Lokier
2008-07-07 7:40 ` Dave Chinner
2008-07-07 16:53 ` Jamie Lokier
2008-07-07 22:51 ` Dave Chinner
2008-07-07 21:16 ` jim owens
2008-07-08 3:01 ` Dave Chinner
2008-07-07 22:02 ` jim owens
2008-07-09 2:03 ` Jamie Lokier
2008-07-03 12:21 ` jim owens
2008-07-03 12:42 ` Andi Kleen
2008-07-04 20:32 ` Anton Altaparmakov
2008-07-05 10:49 ` Jamie Lokier
2008-07-05 21:44 ` Anton Altaparmakov
2008-07-07 23:01 ` jim owens
2008-07-08 1:51 ` Dave Chinner
2008-07-08 13:02 ` jim owens
2008-07-08 14:03 ` jim owens
2008-07-08 14:39 ` jim owens
2008-07-08 14:30 ` Theodore Tso
2008-07-09 1:50 ` Jamie Lokier
2008-06-26 17:01 ` Andreas Dilger
2008-07-03 14:37 ` jim owens
2008-07-03 15:17 ` Jamie Lokier
2008-07-04 8:49 ` Andreas Dilger
2008-07-04 11:28 ` Jamie Lokier
2008-07-03 23:00 ` Dave Chinner
2008-07-04 9:00 ` Andreas Dilger
2008-07-07 23:28 ` jim owens
2008-07-09 1:53 ` Jamie Lokier
2008-07-09 15:01 ` jim owens
2008-07-08 0:06 ` jim owens
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