As many tests as there are in xfstests that simulate disk failure/powerloss, I'm having a hard time believing that no one's bothered to write code to simulate a writeback cache (so the test can drop the cached writes and test flush/fua correctness). So does anyone know if such code exists and I just missed it? Or failing that, any suggestions on the easiest way to hack something up? This is turning into a really irritating problem because it'd be simple enough to write from scratch, but given the amount of code we have that does stuff like this writing it from scratch seems rather silly - hacking loop to do buffered IO instead of O_DIRECT would almost do it, I'd think, except I'm looking at loop.c and just trying to follow the entry points and control flow is making my blood pressure rise. Ideally we'd have something that could easily slot into xfstests, which is using dm-flakey for these tests right now... Any ideas? -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
