https://bugzilla.kernel.org/show_bug.cgi?id=106861 Bug ID: 106861 Summary: DPOFUA should not be related to WCE / Caching mode page Product: IO/Storage Version: 2.5 Kernel Version: 4.2.4 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: SCSI Assignee: linux-scsi@xxxxxxxxxxxxxxx Reporter: tom.ty89@xxxxxxxxx Regression: No The sd driver checks whether the device supports DPO/FUA and reports it to the FUA readonly attribute. However, they are somehow "depended" on the Caching mode page and WCE (sd.c). The fact is, the DPOFUA bit just isn't part of the Caching mode page. Instead it is reported in DEVICE-SPECIFIC PARAMETER of mode parameter header. Moreover, I don't see what impact does WCE have on DPO/FUA as per SBC or SAT. As long as it is implemented correctly, DPO/FUA should be completely fine on drives without write cache as well. So IMHO how the kernel handles the checking and reporting simply has logical mistake. -- You are receiving this mail because: You are the assignee for the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
