Date: Mon, 28 Dec 2009 21:03:12 +0000 From: Bruce Simpson <bms@incunabulum.net> To: Alexander Motin <mav@FreeBSD.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r201139 - in head/sys: cam/ata geom sys Message-ID: <4B391D10.5080602@incunabulum.net> In-Reply-To: <200912282008.nBSK81bw099996@svn.freebsd.org> References: <200912282008.nBSK81bw099996@svn.freebsd.org>
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On 28/12/2009 20:08, Alexander Motin wrote: > Author: mav > Date: Mon Dec 28 20:08:01 2009 > New Revision: 201139 > URL: http://svn.freebsd.org/changeset/base/201139 > > Log: > Add BIO_DELETE support to ada(4): > - For SSDs use TRIM feature of DATA SET MANAGEMENT command, as defined by > ACS-2 specification working draft. > - For CompactFlash use CFA ERASE command, same as ad(4) does. > A thought popped into my head as I read this. Is anyone implementing these ATA commands, intended for CF and SSD devices, in e.g. VirtualBox, QEMU? They could probably help out with block allocation for copy-on-write disk images there. Just a thought. cheers, BMS
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