Btrfs: fix extent buffer bitmap tests on big-endian systems
The in-memory bitmap code manipulates words and is therefore sensitive to endianness, while the extent buffer bitmap code addresses bytes and is byte-order agnostic. Because the byte addressing of the extent buffer bitmaps is equivalent to a little-endian in-memory bitmap, the extent buffer bitmap tests fail on big-endian systems. 34b3e6c9 ("Btrfs: self-tests: Fix extent buffer bitmap test fail on BE system") worked around another endianness bug in the tests but missed this one because ed9e4afd ("Btrfs: self-tests: Execute page straddling test only when nodesize < PAGE_SIZE") disables this part of the test on ppc64. That change lost the original meaning of the test, however. We really want to test that an equivalent series of operations using the in-memory bitmap API and the extent buffer bitmap API produces equivalent results. To fix this, don't use memcmp_extent_buffer() or write_extent_buffer(); do everything bit-by-bit. Reported-by:Anatoly Pugachev <matorola@gmail.com> Tested-by:
Anatoly Pugachev <matorola@gmail.com> Tested-by:
Feifei Xu <xufeifei@linux.vnet.ibm.com> Tested-by:
Chandan Rajendra <chandan@linux.vnet.ibm.com> Signed-off-by:
Omar Sandoval <osandov@fb.com> Signed-off-by:
David Sterba <dsterba@suse.com>
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