smb: client: allow more DFS referrals to be cached

In some DFS setups, a single DFS share may contain hundreds of DFS
links and increasing the DFS cache to allow more referrals to be
cached improves DFS failover as the client will likely find a cached
DFS referral when reconnecting and then avoiding unnecessary remounts.

Signed-off-by: Paulo Alcantara (Red Hat) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: Paulo Alcantara

fs/smb/client/dfs_cache.c

@@ -24,8 +24,8 @@
 
 #include "dfs_cache.h"
 
-#define CACHE_HTABLE_SIZE	32
-#define CACHE_MAX_ENTRIES	64
+#define CACHE_HTABLE_SIZE	512
+#define CACHE_MAX_ENTRIES	1024
 #define CACHE_MIN_TTL		120 /* 2 minutes */
 #define CACHE_DEFAULT_TTL	300 /* 5 minutes */