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Petersen wrote: > > Keith, > >> Your change looks fine, though it sounds odd that md raid is changing >> queue_limit values outside the limits_lock. The stacking limits should >> have set the md device to 0 if one of the member drives doesn't >> support write_zeroes, right? > And even if we had used the limits lock to synchronize the update, that only synchronizes writers but not readers (of the limits). > SCSI can't reliably detect ahead of time whether a device supports WRITE > SAME. So we'll issue a WRITE SAME command and if that fails we'll set > the queue limit to 0. So it is "normal" that the limit changes at > runtime. > > I'm debugging a couple of other regressions from the queue limits > shuffle so I haven't looked into this one yet. But I assume that's > what's happening. >