Hi, I am going to merge latest batch of the nullfs improvements into stable/9. This will bring up significant performance enchancements due to use of the shared locks for lookups if the lower layer supports it, much better caching on the nullfs layer, and proper handling of the text segments on the nullfs. Also, it should improve the error recovery and some corner cases with locking.
Unfortunately, the merge would break KBI for VFS, since it needs 5 new VOP slots, and only three spares are left. We already are very liberal with the VFS KBI, so I do not feel that the merge is not acceptable, due to the benefits it brings to the nullfs. The merge is available at http://people.freebsd.org/~kib/misc/nullfs_9.1.patch
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