ext4: use 64-bit timestamps for mmp_time
The mmp_time field is 64 bits wide, which is good, but calling get_seconds() results in a 32-bit value on 32-bit architectures. Using ktime_get_real_seconds() instead returns 64 bits everywhere. Reviewed-by: NAndreas Dilger <adilger@dilger.ca> Reviewed-by: NJan Kara <jack@suse.cz> Signed-off-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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