Keep the tdb code in sync with Samba4.

Mainly this is the svn changes :

------------------------------------------------------------------------
r23238 | tridge | 2007-05-30 01:15:49 -0700 (Wed, 30 May 2007) | 6 lines

merged transaction lock changes from ctdb

this ensures that having the global lock also implies the transaction
lock

------------------------------------------------------------------------
r22832 | tridge | 2007-05-13 18:00:06 -0700 (Sun, 13 May 2007) | 3 lines

merged the latest tdb changes from ctdb to Samba4

Jeremy.
(This used to be commit ab11c0055761e97ba32a8c3ec4fa6f8763a262cd)

1 files changed, 27 insertions, 6 deletions

diff --git a/source3/lib/tdb/common/tdb.c b/source3/lib/tdb/common/tdb.c
index 8f3c146843..0e9d1dbd74 100644
--- a/source3/lib/tdb/common/tdb.c
+++ b/source3/lib/tdb/common/tdb.c
@@ -30,10 +30,10 @@
 TDB_DATA tdb_null;
 
 /*
-  increment the tdb sequence number if the tdb has been opened using
+  non-blocking increment of the tdb sequence number if the tdb has been opened using
   the TDB_SEQNUM flag
 */
-static void tdb_increment_seqnum(struct tdb_context *tdb)
+void tdb_increment_seqnum_nonblock(struct tdb_context *tdb)
 {
 	tdb_off_t seqnum=0;
 	
@@ -41,16 +41,29 @@ static void tdb_increment_seqnum(struct tdb_context *tdb)
 		return;
 	}
 
-	if (tdb_brlock(tdb, TDB_SEQNUM_OFS, F_WRLCK, F_SETLKW, 1, 1) != 0) {
-		return;
-	}
-
 	/* we ignore errors from this, as we have no sane way of
 	   dealing with them.
 	*/
 	tdb_ofs_read(tdb, TDB_SEQNUM_OFS, &seqnum);
 	seqnum++;
 	tdb_ofs_write(tdb, TDB_SEQNUM_OFS, &seqnum);
+}
+
+/*
+  increment the tdb sequence number if the tdb has been opened using
+  the TDB_SEQNUM flag
+*/
+static void tdb_increment_seqnum(struct tdb_context *tdb)
+{
+	if (!(tdb->flags & TDB_SEQNUM)) {
+		return;
+	}
+
+	if (tdb_brlock(tdb, TDB_SEQNUM_OFS, F_WRLCK, F_SETLKW, 1, 1) != 0) {
+		return;
+	}
+
+	tdb_increment_seqnum_nonblock(tdb);
 
 	tdb_brlock(tdb, TDB_SEQNUM_OFS, F_UNLCK, F_SETLKW, 1, 1);
 }
@@ -653,3 +666,11 @@ int tdb_get_flags(struct tdb_context *tdb)
 	return tdb->flags;
 }
 
+
+/*
+  enable sequence number handling on an open tdb
+*/
+void tdb_enable_seqnum(struct tdb_context *tdb)
+{
+	tdb->flags |= TDB_SEQNUM;
+}