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Date: Sat, 26 Jul 2014 13:44:08 +0000 From: KY Srinivasan <kys@...rosoft.com> To: "Martin K. Petersen" <martin.petersen@...cle.com> CC: Sitsofe Wheeler <sitsofe@...il.com>, Christoph Hellwig <hch@...radead.org>, "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>, "ohering@...e.com" <ohering@...e.com>, "apw@...onical.com" <apw@...onical.com>, "jasowang@...hat.com" <jasowang@...hat.com>, "jbottomley@...allels.com" <jbottomley@...allels.com>, "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org> Subject: RE: [PATCH v2 3/3] [SCSI] Make LBP quirk skip lbpme checks tests > -----Original Message----- > From: Martin K. Petersen [mailto:martin.petersen@...cle.com] > Sent: Friday, July 25, 2014 9:57 AM > To: KY Srinivasan > Cc: Martin K. Petersen; Sitsofe Wheeler; Christoph Hellwig; > gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org; > devel@...uxdriverproject.org; ohering@...e.com; apw@...onical.com; > jasowang@...hat.com; jbottomley@...allels.com; linux- > scsi@...r.kernel.org > Subject: Re: [PATCH v2 3/3] [SCSI] Make LBP quirk skip lbpme checks tests > > >>>>> "KY" == KY Srinivasan <kys@...rosoft.com> writes: > > KY> For the pass through case, the host validates the request and passes > KY> the request to the device. However, not all scsi commands are > KY> passed through even though the device it is being passed through may > KY> support the command. WRITE_SAME is one such command. > Consequently, > KY> in the EVPD page, we will set state indicating that WRITE_SAME is > KY> not supported (even if the device supports it). > > The LBP VPD page flags UNMAP as being supported. Do you actually support > UNMAP to DSM TRIM SCSI-ATA translation? Martin, I have been told by the Windows folks that this is done. I am trying to get additional details. K. Y > > One challenge in that department is that a single UNMAP command may turn > into many, many, many DSM TRIM commands on the underlying SATA > device. > That's why we went with WRITE SAME for the internal Linux SATL, capping > the maximum number of blocks to what we can fit in a single DSM TRIM > command. > > -- > Martin K. Petersen Oracle Linux Engineering -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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