6.2.0.187

Version 6.2.0.187

Note: This is a pre-release version, future versions of VDO may not support
VDO devices created with this version.
- Fixed a potential deadlock in the UDS index by using the kernel supplied
  struct callback instead of our own implementation of synchronous
  callbacks.
- Eliminated obsolete code and fields from UDS.
- Converted the VDO module to use numeric.h from the UDS module instead of
  having its own version.
- Fixed a bug which would cause incorrect encoding of VDO data structures
  on disk.
- Removed or modified logging which prints pointers from the kernel since
  newer kernels obfuscate the pointer values for security reasons.
- Eliminated confusing and spurious error messages when rebuilding a UDS
  index.
- Improved memory allocation by not using the incorrect __GFP_NORETRY flag
  and by using the memalloc_noio_save mechanism.
- Finished conversion of the encoding and decoding of the VDO's on-disk
  structures to be platform independent.
- Converted VDO to use the atomic API from the UDS module instead of its
  own.
- Fixed memory leaks in UDS error paths.
- Fixed a potential stack overflow when reaping the recovery journal.