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e2fsck: fix portability problems caused by unaligned accesses
The on-disk format for the ext4 journal can have unaigned 32-bit integers. This can happen when replaying a journal using a obsolete checksum format (which was never popularly used, since the v3 format replaced v2 while the metadata checksum feature was being stablized), and in the fast commit feature (which landed in the 5.10 kernel, although it is not enabled by default). This commit fixes the following regression tests on some platforms (such as running 32-bit arm architectures on a 64-bit arm kernel): j_recover_csum2_32bit, j_recover_csum2_64bit, j_recover_fast_commit. #65 Addresses-Debian-Bug: #987641 Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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