IOEngineTests fail on 64k page systems (ppc*)

[waldiTM]

Several tests out of IOEngineTests fail on ppc systems, if the kernel is configured for 64kB pages.

Note: Google Test filter = IOEngineTests*                                                                              
[==========] Running 9 tests from 1 test suite.                                                                        
[----------] Global test environment set-up.                                                                           
[----------] 9 tests from IOEngineTests                                                                                
[ RUN      ] IOEngineTests.empty_test                                                                                  
[       OK ] IOEngineTests.empty_test (35 ms)
[ RUN      ] IOEngineTests.open_and_close
[       OK ] IOEngineTests.open_and_close (32 ms)
[ RUN      ] IOEngineTests.you_can_read_a_read_only_handle
unknown file: Failure
C++ exception with description "Data passed to issue_io must be page aligned                                          
" thrown in the test body.
[  FAILED  ] IOEngineTests.you_can_read_a_read_only_handle (32 ms)                                                    
[ RUN      ] IOEngineTests.you_cannot_write_to_a_read_only_handle                                                     
unknown file: Failure
C++ exception with description "Data passed to issue_io must be page aligned                                          
" thrown in the test body.
[  FAILED  ] IOEngineTests.you_cannot_write_to_a_read_only_handle (32 ms)                                             
[ RUN      ] IOEngineTests.you_can_write_to_a_read_write_handle                                                       
unknown file: Failure
C++ exception with description "Data passed to issue_io must be page aligned                                          
" thrown in the test body.
[  FAILED  ] IOEngineTests.you_can_write_to_a_read_write_handle (32 ms)                                               
[ RUN      ] IOEngineTests.final_block_read_succeeds
unknown file: Failure
C++ exception with description "Data passed to issue_io must be page aligned                                          
" thrown in the test body.
[  FAILED  ] IOEngineTests.final_block_read_succeeds (32 ms)                                                          
[ RUN      ] IOEngineTests.out_of_bounds_read_fails
unknown file: Failure
C++ exception with description "Data passed to issue_io must be page aligned                                          
" thrown in the test body.
[  FAILED  ] IOEngineTests.out_of_bounds_read_fails (32 ms)
[ RUN      ] IOEngineTests.out_of_bounds_write_succeeds
unknown file: Failure
C++ exception with description "Data passed to issue_io must be page aligned                                          
" thrown in the test body.
[  FAILED  ] IOEngineTests.out_of_bounds_write_succeeds (32 ms)                                                       
[ RUN      ] IOEngineTests.succeed_with_timeout
unknown file: Failure
C++ exception with description "Data passed to issue_io must be page aligned                                          
" thrown in the test body.
[  FAILED  ] IOEngineTests.succeed_with_timeout (32 ms)
[----------] 9 tests from IOEngineTests (291 ms total)

The error shows up, because the mempool created in unit-tests/io_engine_t.cc gives out blocks aligned to 32kB (64 * 512), which is smaller then the page size of 64kB.