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

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Date:	Sun, 23 Nov 2008 16:11:56 +0900
From:	Tejun Heo <teheo@...e.de>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dwmw2@...radead.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,
	Jens Axboe <jens.axboe@...cle.com>
Cc:	Matthew Wilcox <matthew@....cx>
Subject: Re: about TRIM/DISCARD support and barriers

Hello,

cc'ing Matthew whom I forgot to cc in the first message.  Matthew, the
original message is...

 http://lkml.org/lkml/2008/11/22/260

Tejun Heo wrote:
> Dongjun Shin who works for Samsung SSD dep asked me about libata TRIM
> support and pointed me to the new DISCARD support David Woodhouse got
> merged for 2.6.28.  I took a look at the code and blk-layer
> interface-wise we seemed to be ready both for filesystems and userland
> (so that fsck or something which runs background can mark unused
> blocks) but there doesn't seem to be any low level driver which
> actually implements ->prepare_discard_fn or fs which sets the DISCARD
> flag.

Dongjun, the only doc I can find about ATA TRIM is the following one.

 http://t13.org/Documents/UploadedDocuments/docs2007/e07154r3-Data_Set_Management_Proposal_for_ATA-ACS2.pdf

And AFAICS this hasn't made into ACS yet.  Is this what you guys are
gonna implement and Windows7 is gonna use?

Thanks.

-- 
tejun
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