add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/include/linux/dm-kcopyd.h
..
..
@@ -21,6 +21,7 @@
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 #define DM_KCOPYD_IGNORE_ERROR 1
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 #define DM_KCOPYD_WRITE_SEQ    2
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+#define DM_KCOPYD_SNAP_MERGE   3
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 struct dm_kcopyd_throttle {
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 	unsigned throttle;