On Wed, May 25, 2016 at 11:33:59PM +0200, David Sterba wrote: > On Wed, May 25, 2016 at 10:51:34AM -0400, Josef Bacik wrote: > > Traditionally we've calculated the global block rsv by guessing how much of the > > metadata used amount was the extent tree, and then taking the data size and > > figuring out how large the csum tree would have to be to hold that much data. > > > > This is imprecise and falls down on MIXED file systems as we can't trust the > > data used amount. This resulted in failures for xfstests generic/333 because it > > creates lots of clones, which explodes out the extent tree. Our global reserve > > calculations were woefully inaccurate in this case which meant we got into a > > situation where we did not have enough reserved to do our work. > > > > We know we only use the global block rsv for the extent, csum, and root trees, > > so just get the bytes used for these trees and use that as the basis of our > > global reserve. Since these are not reference counted trees the bytes_used > > value will be accurate. This fixed the transaction aborts seen with > > generic/333. Thanks, > > The abort is gone, the fstest fails with > > generic/333 - output mismatch (see results//generic/333.out.bad) > --- tests/generic/333.out 2016-04-08 11:50:13.000000000 +0200 > +++ results//generic/333.out.bad 2016-05-25 23:30:50.965956265 +0200 > @@ -2,3 +2,4 @@ > Format and mount > Initialize file > Snapshot a file undergoing directio rewrite > +touch: cannot touch '/mnt/scratch/test-333/finished': No space left on device Yeah, the finished flag file should be in $TEST_DIR, not $SCRATCH_MNT. Patches coming... --D > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" 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 linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
