[PATCH] Fix "use mmap = no"

[Volker Lendecke]

Hi!

Review appreciated!

Thanks, Volker

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From 389bd67f16e2ff0a94355753bf9cc33e7ea90deb Mon Sep 17 00:00:00 2001
From: Volker Lendecke <vl at samba.org>
Date: Wed, 11 Apr 2018 08:01:38 +0200
Subject: [PATCH] dbwrap: Fix "use mmap = no"

Mutexes require mmap.

Signed-off-by: Volker Lendecke <vl at samba.org>
---
 source3/lib/dbwrap/dbwrap_open.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/source3/lib/dbwrap/dbwrap_open.c b/source3/lib/dbwrap/dbwrap_open.c
index a6bf30f0ae7..658ccb602a8 100644
--- a/source3/lib/dbwrap/dbwrap_open.c
+++ b/source3/lib/dbwrap/dbwrap_open.c
@@ -111,6 +111,15 @@ struct db_context *db_open(TALLOC_CTX *mem_ctx,
 		try_mutex = lp_parm_bool(-1, "dbwrap_tdb_mutexes", "*", try_mutex);
 		try_mutex = lp_parm_bool(-1, "dbwrap_tdb_mutexes", base, try_mutex);
 
+		if (!lp_use_mmap()) {
+			/*
+			 * Mutexes require mmap. "use mmap = no" can
+			 * be a debugging tool, so let it override the
+			 * mutex parameters
+			 */
+			try_mutex = false;
+		}
+
 		if (try_mutex && tdb_runtime_check_for_robust_mutexes()) {
 			tdb_flags |= TDB_MUTEX_LOCKING;
 		}
-- 
2.11.0