> -----Original Message----- > From: James Bottomley [mailto:James.Bottomley@xxxxxxxxxxxxxxxxxxxxx] > Sent: Thursday, May 22, 2014 7:38 AM > To: KY Srinivasan > Cc: Andy Whitcroft; Ian Abbott; linux-scsi@xxxxxxxxxxxxxxx; > devel@xxxxxxxxxxxxxxxxxxxxxx; Haiyang Zhang; Tim Gardner > Subject: Re: [PATCH 0/2] scsi: hyper-v storvsc changes by Ubuntu > > On Thu, 2014-05-22 at 10:49 +0000, KY Srinivasan wrote: > > > > > > > -----Original Message----- > > > From: Andy Whitcroft [mailto:apw@xxxxxxxxxxxxx] > > > Sent: Wednesday, May 21, 2014 7:25 AM > > > To: Ian Abbott > > > Cc: linux-scsi@xxxxxxxxxxxxxxx; devel@xxxxxxxxxxxxxxxxxxxxxx; KY > > > Srinivasan; Haiyang Zhang; James E.J. Bottomley; Tim Gardner > > > Subject: Re: [PATCH 0/2] scsi: hyper-v storvsc changes by Ubuntu > > > > > > On 16 May 2014 16:39, Ian Abbott <abbotti@xxxxxxxxx> wrote: > > > > These changes to the Microsoft Hyper-V storage driver in Ubuntu > > > > Saucy's > > > > 3.13 kernel look useful for the mainline kernel, especially as > > > > they enable 'TRIM' support. > > > > > > > > Andy Whitcroft (2): > > > > scsi: hyper-v storvsc switch up to SPC-3 > > > > scsi: hyper-v storvsc -- host takes MAINTENANCE_IN commands badly > -- > > > > elide them > > > > > > > > drivers/scsi/storvsc_drv.c | 10 ++++++++++ > > > > 1 file changed, 10 insertions(+) > > > > > > > > > The back story here is a little complex. The main issue is that the > > > Hyper-V drives claim to be SPC-2, and yet implement the SPC-3 > extensions for TRIM. > > > We did attempt to upstream quirks to allow these features to be > > > negotiated specifically for the Hyper-V virtual drives (minimum > > > regression potential) but these were NAKd, and it was suggested that > > > just overriding the Hyper-V drives to SPC-3 unconditionally was more > > > appropriate. The first of the patches here does does this. This > > > has been sitting in our tree for some time as it was not clear that > > > this would be entirely safe, though the SPC-3 bits are in theory at > > > least mostly detected. That said this change has been in Ubuntu for > > > a full cycle now and does not seem to have caused any issues. If KY > > > is happy we should likely submit it formally. The second fix I believed was > already being submitted to mainline. > > > > > > KY? > > > > The Windows guys are not currently comfortable claiming conformance to > > SPC-3, as they have not done the necessary testing. This will change > > hopefully soon. > > Any bounds on the value of "soon" are we talking weeks or months? I think > trim is a feature, which means no huge rush to get this in, but it is nice to > respond in a timely fashion to a request from a distribution to enable a useful > feature. James, I know they have been testing for SPC-3 compliance. I have pinged them to see when they may give me the go ahead. I will keep you posted. Thanks, K. Y _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
