linux-kernel - Re: [PATCH 4/5] ide: Add support for TRIM

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Date:	Wed, 8 Apr 2009 23:44:04 +0900
From:	Dongjun Shin <djshin90@...il.com>
To:	Mark Lord <liml@....ca>
Cc:	Matthew Wilcox <willy@...ux.intel.com>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, jgarzik@...hat.com,
	David Woodhouse <David.Woodhouse@...el.com>
Subject: Re: [PATCH 4/5] ide: Add support for TRIM

On Wed, Apr 8, 2009 at 11:33 PM, Mark Lord <liml@....ca> wrote:
>
> Matthew Wilcox wrote:
>>
>> From: David Woodhouse <David.Woodhouse@...el.com>
>>
>> Signed-off-by: David Woodhouse <David.Woodhouse@...el.com>
>> [modified to reduce amount of special casing needed for discard]
>> Signed-off-by: Matthew Wilcox <willy@...ux.intel.com>
>> ---
>
> ..
>>
>> +       task->tf.command = ATA_CMD_DSM;
>> +       task->tf.feature = ATA_DSM_TRIM;
>> +       task->tf.hob_feature = 0x00;
>> +       task->tf.nsect = size / 512;
>> +       task->tf.hob_nsect = (size / 512) >> 8;
>
> ..
>
> Matthew (or others),
>
> Could you perhaps explain what the purpose of the data portion
> of this command is for?  The draft ATA spec I have here has mangled
> text in the description -- like it's missing a crucial sentence there.
>
> So it's not obvious exactly why this command even needs data to
> be transfered.

It's for transfering list of LBA ranges which composed of
LBA offset (48bit) and length of data to be trimmed (16bit).

--
Dongjun
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