db/simple: mount points

A SimpleDatabase instance can now "mount" other Database instances at
certain locations.  This is used to use a new SimpleDatabase instance
for each storage mount (issued with the "mount" protocol command).
Each such instance has its own database file, stored in the directory
that is specified with the "cache_directory" option.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/db/DatabaseError.hxx b/src/db/DatabaseError.hxx
index 1485a21b6..c71bbdfff 100644
--- a/src/db/DatabaseError.hxx
+++ b/src/db/DatabaseError.hxx
@@ -30,6 +30,8 @@ enum db_error {
 	DB_DISABLED,
 
 	DB_NOT_FOUND,
+
+	DB_CONFLICT,
 };
 
 extern const Domain db_domain;