> > I think a /sys/ "dma" attribute (pick a name) might be most appropriate, > > or we just just implement HDIO_[GS]ET_DMA as a simpler/lazier mechanism. > > The problem is that libata lacks any locking needed for having this > (and other useful) settings tunable on per device basis. Actually libata does have the paths for it and uses them when drives are hotplugged. Tejun posted an explanation of how to implement it a while ago when I proposed a totally bogus implementation - it has to be done via the EH code. So we'd add user mode masks to each device and the sysfs nodes would update that mask and trigger the EH processing to halt activity, retune the disks and continue - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
