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Date:      Sat, 27 Jun 2009 14:01:56 +0300
From:      Alexander Motin <mav@FreeBSD.org>
To:        Roman Divacky <rdivacky@FreeBSD.org>
Cc:        FreeBSD-Current <freebsd-current@FreeBSD.org>, scottl@FreeBSD.org
Subject:   Re: RFC: ATA to CAM integration patch
Message-ID:  <4A45FC24.20408@FreeBSD.org>
In-Reply-To: <20090627101151.GA40915@freebsd.org>
References:  <4A4517BE.9040504@FreeBSD.org> <20090627101151.GA40915@freebsd.org>

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Roman Divacky wrote:
> On Fri, Jun 26, 2009 at 09:47:26PM +0300, Alexander Motin wrote:
>> I would like to present for testing and feedback present state of my and
>> Scott work on extending CAM subsystem to support ATA in addition to
>> SCSI. At this moment we have:
> 
> this is awesome! do you plan to add support for the TRIM command support?
> what would it take to teach FreeBSD to use the TRIM?

I haven't looked on it yet, but I think should be really easy from disk 
driver point ov view. After last firmware update, my SSD should now 
support TRIM, so I will look on it closer, as time permit.

The main question is to implement BIO_DELETE in filesystems code. I have 
seen in lists that UFS patches were made long time ago, but they are 
still not committed. Now practically the only BIO_DELETE consumer is 
newfs with -E option, which I have successfully used with mmcsd driver.

-- 
Alexander Motin



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