> Isn't any type of kernel-side ordering an exercise in futility, since > a) the kernel has no knowledge of the disk's actual geometry > b) most drives will internally re-order requests anyway
They will but only as permitted by the commands queued, so you have some control depending upon the interface capabilities. > c) cheap drives won't support barriers Barriers are pretty much universal as you need them for power off ! > Even assuming the drives honored all your requests without lying, how would > you really want this behavior exposed? From the userland perspective, there > are very few apps that care. Probably only transactional databases, really. And file systems internally sometimes. A file system is after all a transactional database of sorts. Alan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
