dm persistent data: set some btree fn parms const

Mark some constant parameters constant in some dm-btree functions.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/md/persistent-data/dm-btree.h b/drivers/md/persistent-data/dm-btree.h
index a2cd50441ca1..fced8316bca2 100644
--- a/drivers/md/persistent-data/dm-btree.h
+++ b/drivers/md/persistent-data/dm-btree.h
@@ -58,21 +58,21 @@ struct dm_btree_value_type {
          * somewhere.) This method is _not_ called for insertion of a new
          * value: It is assumed the ref count is already 1.
          */
-        void (*inc)(void *context, void *value);
+        void (*inc)(void *context, const void *value);
 
         /*
          * This value is being deleted.  The btree takes care of freeing
          * the memory pointed to by @value.  Often the del function just
          * needs to decrement a reference count somewhere.
          */
-        void (*dec)(void *context, void *value);
+        void (*dec)(void *context, const void *value);
 
         /*
          * A test for equality between two values.  When a value is
          * overwritten with a new one, the old one has the dec method
          * called _unless_ the new and old value are deemed equal.
          */
-        int (*equal)(void *context, void *value1, void *value2);
+        int (*equal)(void *context, const void *value1, const void *value2);
 };
 
 /*