On Fri, 15 May 2015, NeilBrown wrote: > Some storage devices don't handle suspend as well as they should and lose > requests resulting in corruption. They should obviously be fixed, but it is > you who gets the problem reports and you are not in a position to fix them. > So you want a general solution that hides those problems. > sys_sync at suspend time is a sort-of solution because it flushes and waits > so there is less in-flight IO immediately after a sys_sync and so less > opportunity for a bad device to stuff up. > But you seem to suggest that sys_sync isn't a complete solution and it > doesn't guarantee that xfs is not doing some background metadata IO. > > Maybe a sensible thing to do would be to hook the "disk" devices into suspend > and have them flush their queue and possibly send a CACHE_FLUSH command. > That would provide more of a guarantee for you, and less of a cost for Len, > would it not?
The sd driver already does this. Alan Stern -- 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/
