linux-kernel - Re: about TRIM/DISCARD support and barriers

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Message-ID: <20081124030111.GC2163@mit.edu>
Date:	Sun, 23 Nov 2008 22:01:11 -0500
From:	Theodore Tso <tytso@....EDU>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Matthew Wilcox <matthew@....cx>, Tejun Heo <teheo@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...e.de>,
	Jens Axboe <jens.axboe@...cle.com>,
	IDE/ATA development list <linux-ide@...r.kernel.org>,
	Jeff Garzik <jeff@...zik.org>,
	Dongjun Shin <djshin90@...il.com>, chris.mason@...cle.com
Subject: Re: about TRIM/DISCARD support and barriers

On Sun, Nov 23, 2008 at 01:39:44PM +0000, David Woodhouse wrote:
> On Sun, 2008-11-23 at 05:35 -0700, Matthew Wilcox wrote:
> > The current VFAT filesystem implements DISCARD. 
> 
> As does btrfs. I think I posted ext2 patches a little while ago too? Or
> someone else did. Did they get merged?

Looks like they didn't get merged.  I thought akpm was going to merge
them.  Ext4 has discard support though.  It doesn't port easily to
ext3 since it ext4 has a new block allocator.

					- Ted
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