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From: ebiederm@xmission.com (Eric W. Biederman)
To: Mike Fedyk <mfedyk@matchmail.com>
Cc: Ed Sweetman <ed.sweetman@wmich.edu>,
	Alex Tomas <bzzz@tmi.comex.ru>,
	linux-kernel@vger.kernel.org, ext2-devel@lists.sourceforge.net
Subject: Re: [Ext2-devel] Re: [RFC] extents support for EXT3
Date: 31 Aug 2003 14:25:49 -0600	[thread overview]
Message-ID: <m18yp9r2uq.fsf@ebiederm.dsl.xmission.com> (raw)
In-Reply-To: <20030829231726.GE3846@matchmail.com>

Mike Fedyk <mfedyk@matchmail.com> writes:

> On Fri, Aug 29, 2003 at 06:25:02PM -0400, Ed Sweetman wrote:
> > you get no real slowdown as far as rough benchmarks are concerned, 
> > perhaps with a microbenchmark you would see one and also, doesn't it 
> > take up more space to save the extent info and such? Either way, all of 
> > it's real benefits occur on large files.
> 
> IIRC, if your blocks are contiguous, you can save as soon as soon as the
> file size goes above one block (witout extents, the first 12 blocks are
> pointed to by what?  I forget... :-/ )

They are pointed to directly from the inode.

In light of other concerns how reasonable is a switch to e2fsck that
will remove extents so people can downgrade filesystems?

Also given the incompatibility on the file format any chance of this
being developed as ext4?

Eric

  reply	other threads:[~2003-08-31 20:28 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-08-28  8:22 [RFC] extents support for EXT3 Alex Tomas
2003-08-28 17:22 ` [Ext2-devel] " Mike Fedyk
2003-08-29  5:55   ` Alex Tomas
2003-08-28 18:12 ` Ed Sweetman
2003-08-29  5:59   ` Alex Tomas
2003-08-29 15:28     ` Ed Sweetman
2003-08-29 15:38       ` Alex Tomas
2003-08-29 15:52         ` Ed Sweetman
2003-08-29 16:10           ` Alex Tomas
2003-08-29 16:16             ` Alex Tomas
2003-08-29 16:20             ` Ed Sweetman
2003-08-29 16:34               ` Alex Tomas
2003-08-29 17:49                 ` Ed Sweetman
2003-08-29 18:09                   ` Alex Tomas
2003-08-29 19:55                     ` Ed Sweetman
2003-08-29 21:39                       ` [Ext2-devel] " Mike Fedyk
2003-08-29 22:25                         ` Ed Sweetman
2003-08-29 23:17                           ` Mike Fedyk
2003-08-31 20:25                             ` Eric W. Biederman [this message]
2003-08-31 20:37                               ` Alex Tomas
2003-09-05 10:06                               ` Pavel Machek
2003-09-05 14:55                                 ` Eric W. Biederman
2003-08-30  9:09                       ` Alex Tomas
2003-08-30  8:55                   ` Alex Tomas
2003-08-30 10:13                   ` Alex Tomas
2003-08-28 22:00 ` Ramón Rey Vicente󮠒
2003-08-29  6:04   ` Alex Tomas
2003-08-29  9:55     ` Ramón Rey Vicente󮠒
2003-09-06  0:19 ` jw schultz
2003-09-06  6:09   ` Alex Tomas

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