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H A Df2fs.hdiff 416d2dbb4ebc0be6899c0155828ce03c9a01a023 Thu Nov 30 05:28:21 CST 2017 Chao Yu <yuchao0@huawei.com> f2fs: clean up hash codes

f2fs_chksum and f2fs_crc32 use the same 'crc32' crypto engine, also
their implementation are almost the same, except with different
shash description context.

Introduce __f2fs_crc32 to wrap the common codes, and reuse it in
f2fs_chksum and f2fs_crc32.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>