On Thu, Oct 06, 2016 at 04:12:56PM +0800, Qu Wenruo wrote: > Hi, > > Just as the title says, for some case(OK, btrfs again) we need to catch a > file system in special timing. > > In this specific case, we need to grab a btrfs image undergoing balancing, > just before the balance finished. > > Although we can use flakey to drop all write, we still don't have method to > catch the timing of the that transaction. > > > On the other hand, we can tweak our local kernel, adding msleep()/message > and dump the disk during the sleep. > And the image I dumped can easily trigger btrfs kernel and user-space bug. > > So I'm wondering if I can just upload a zipped raw image as part of the test > case? > Doesn't necessarily bother me one way or the other, but something we've done with XFS in such situations is introduce a DEBUG mode only sysfs tunable that delays certain infrastructure (log recovery in our case) to coordinate with test cases that try to reproduce such timing/racing problems. See test xfs/051 for an example.. Brian > Thanks, > Qu > > > -- > To unsubscribe from this list: send the line "unsubscribe fstests" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe fstests" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
