X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Ftdb2%2Ftdb2.h;fp=ccan%2Ftdb2%2Ftdb2.h;h=3fa99b15dbb6cab3d09162b3789efd5b8501e875;hp=525fbd71758c5c0632c101729dce761295b3cb66;hb=e01d795c8964b791def1e9f68c386b350b3a2a84;hpb=b3ae79aee2e345c662a99c5022f0ca713782bd6e

diff --git a/ccan/tdb2/tdb2.h b/ccan/tdb2/tdb2.h
index 525fbd71..3fa99b15 100644
--- a/ccan/tdb2/tdb2.h
+++ b/ccan/tdb2/tdb2.h
@@ -87,6 +87,7 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
 #define TDB_ALLOW_NESTING   256 /* fake nested transactions */
 #define TDB_RDONLY   512 /* implied by O_RDONLY */
 #define TDB_VERSION1  1024 /* create/open an old style TDB */
+#define TDB_CANT_CHECK  2048 /* has a feature which we don't understand */
 
 /**
  * tdb1_incompatible_hash - better (Jenkins) hash for tdb1
@@ -538,6 +539,11 @@ enum TDB_ERROR tdb_repack(struct tdb_context *tdb);
  * checks as well.  If check() returns an error, that is returned from
  * tdb_check().
  *
+ * Note that the TDB uses a feature which we don't understand which
+ * indicates we can't run tdb_check(), this will log a warning to that
+ * effect and return TDB_SUCCESS.  You can detect this condition by
+ * looking for TDB_CANT_CHECK in tdb_get_flags().
+ *
  * Returns TDB_SUCCESS or an error.
  */
 #define tdb_check(tdb, check, data)					\