James Bottomley wrote:
For the MD case, this is what REQ_FAILFAST is for.
I cannot find where SCSI honours that flag. James? And for that matter, even when I patch SCSI so that it *does* honour it, I don't actually see the flag making it into the SCSI layer from above. And I don't see where/how the block layer takes care when considering merge FAILFAST/READA requests with non FAILFAST/READA requests. To me, it looks perfectly happy to add non-FAILFAST/READA bios to a FAILFAST request, risking data loss if a lower-layer decides to honour the FAILFAST/READA flags. So it's a pretty Good Thing(tm) that SCSI doesn't currently honour it. ;) - 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
