> -----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. K. Y > > -apw ��.n��������+%������w��{.n�����{������ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
