tdb: Only mmap the mutex area if not already mmap'ed

BUG: https://bugzilla.samba.org/show_bug.cgi?id=12455

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

diff --git a/lib/tdb/common/mutex.c b/lib/tdb/common/mutex.c
index 3420d21f348a3eaf8b2ff370f8da3480361b0bcd..3df9f5b06adf6334d46a0d71f070a6649d364431 100644 (file)
--- a/lib/tdb/common/mutex.c
+++ b/lib/tdb/common/mutex.c
@@ -623,6 +623,10 @@ int tdb_mutex_mmap(struct tdb_context *tdb)
                return 0;
        }
 
+       if (tdb->mutexes != NULL) {
+               return 0;
+       }
+
        ptr = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FILE,
                   tdb->fd, 0);
        if (ptr == MAP_FAILED) {