> -----Original Message----- > From: Martin K. Petersen [mailto:martin.petersen@xxxxxxxxxx] > Sent: Friday, July 25, 2014 9:57 AM > To: KY Srinivasan > Cc: Martin K. Petersen; Sitsofe Wheeler; Christoph Hellwig; > gregkh@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > devel@xxxxxxxxxxxxxxxxxxxxxx; ohering@xxxxxxxx; apw@xxxxxxxxxxxxx; > jasowang@xxxxxxxxxx; jbottomley@xxxxxxxxxxxxx; linux- > scsi@xxxxxxxxxxxxxxx > Subject: Re: [PATCH v2 3/3] [SCSI] Make LBP quirk skip lbpme checks tests > > >>>>> "KY" == KY Srinivasan <kys@xxxxxxxxxxxxx> 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 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
