btrfs: use monotonic time for transaction handling
The transaction times were changed to ktime_get_real_seconds to avoid the y2038 overflow, but they still have a minor problem when they go backwards or jump due to settimeofday() or leap seconds. This changes the transaction handling to instead use ktime_get_seconds(), which returns a CLOCK_MONOTONIC timestamp that has neither of those problems. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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