From 9e8df7403af834699eb94a71a5c1131a98c8b4c9 Mon Sep 17 00:00:00 2001
From: Michael Adam <obnox@samba.org>
Date: Wed, 16 Jun 2010 09:19:21 +0200
Subject: s3:idmap_tdb: convert idmap_tdb_allocate_id() to use transaction
 wrappers

---
 source3/winbindd/idmap_tdb.c | 113 ++++++++++++++++++++++++++-----------------
 1 file changed, 68 insertions(+), 45 deletions(-)

(limited to 'source3/winbindd/idmap_tdb.c')

diff --git a/source3/winbindd/idmap_tdb.c b/source3/winbindd/idmap_tdb.c
index 41ccc57930..6f7b72700e 100644
--- a/source3/winbindd/idmap_tdb.c
+++ b/source3/winbindd/idmap_tdb.c
@@ -398,14 +398,67 @@ static NTSTATUS idmap_tdb_alloc_init( const char *params )
  Allocate a new id. 
 **********************************/
 
-static NTSTATUS idmap_tdb_allocate_id(struct unixid *xid)
+struct idmap_tdb_allocate_id_context {
+	const char *hwmkey;
+	const char *hwmtype;
+	uint32_t high_hwm;
+	uint32_t hwm;
+};
+
+static NTSTATUS idmap_tdb_allocate_id_action(struct db_context *db,
+					     void *private_data)
 {
 	NTSTATUS ret;
+	struct idmap_tdb_allocate_id_context *state;
+	uint32_t hwm;
+
+	state = (struct idmap_tdb_allocate_id_context *)private_data;
+
+	hwm = dbwrap_fetch_int32(db, state->hwmkey);
+	if (hwm == -1) {
+		ret = NT_STATUS_INTERNAL_DB_ERROR;
+		goto done;
+	}
+
+	/* check it is in the range */
+	if (hwm > state->high_hwm) {
+		DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
+			  state->hwmtype, (unsigned long)state->high_hwm));
+		ret = NT_STATUS_UNSUCCESSFUL;
+		goto done;
+	}
+
+	/* fetch a new id and increment it */
+	ret = dbwrap_trans_change_uint32_atomic(db, state->hwmkey, &hwm, 1);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0, ("Fatal error while fetching a new %s value: %s\n!",
+			  state->hwmtype, nt_errstr(ret)));
+		goto done;
+	}
+
+	/* recheck it is in the range */
+	if (hwm > state->high_hwm) {
+		DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
+			  state->hwmtype, (unsigned long)state->high_hwm));
+		ret = NT_STATUS_UNSUCCESSFUL;
+		goto done;
+	}
+
+	ret = NT_STATUS_OK;
+	state->hwm = hwm;
+
+done:
+	return ret;
+}
+
+static NTSTATUS idmap_tdb_allocate_id(struct unixid *xid)
+{
 	const char *hwmkey;
 	const char *hwmtype;
 	uint32_t high_hwm;
-	uint32_t hwm;
-	int res;
+	uint32_t hwm = 0;
+	NTSTATUS status;
+	struct idmap_tdb_allocate_id_context state;
 
 	/* Get current high water mark */
 	switch (xid->type) {
@@ -427,52 +480,22 @@ static NTSTATUS idmap_tdb_allocate_id(struct unixid *xid)
 		return NT_STATUS_INVALID_PARAMETER;
 	}
 
-	res = idmap_alloc_db->transaction_start(idmap_alloc_db);
-	if (res != 0) {
-		DEBUG(1, (__location__ " Failed to start transaction.\n"));
-		return NT_STATUS_UNSUCCESSFUL;
-	}
-
-	if ((hwm = dbwrap_fetch_int32(idmap_alloc_db, hwmkey)) == -1) {
-		idmap_alloc_db->transaction_cancel(idmap_alloc_db);
-		return NT_STATUS_INTERNAL_DB_ERROR;
-	}
-
-	/* check it is in the range */
-	if (hwm > high_hwm) {
-		DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n", 
-			  hwmtype, (unsigned long)high_hwm));
-		idmap_alloc_db->transaction_cancel(idmap_alloc_db);
-		return NT_STATUS_UNSUCCESSFUL;
-	}
+	state.hwm = hwm;
+	state.high_hwm = high_hwm;
+	state.hwmtype = hwmtype;
+	state.hwmkey = hwmkey;
 
-	/* fetch a new id and increment it */
-	ret = dbwrap_change_uint32_atomic(idmap_alloc_db, hwmkey, &hwm, 1);
-	if (!NT_STATUS_IS_OK(ret)) {
-		DEBUG(0, ("Fatal error while fetching a new %s value: %s\n!",
-			  hwmtype, nt_errstr(ret)));
-		idmap_alloc_db->transaction_cancel(idmap_alloc_db);
-		return ret;
-	}
+	status = dbwrap_trans_do(idmap_alloc_db, idmap_tdb_allocate_id_action,
+				 &state);
 
-	/* recheck it is in the range */
-	if (hwm > high_hwm) {
-		DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n", 
-			  hwmtype, (unsigned long)high_hwm));
-		idmap_alloc_db->transaction_cancel(idmap_alloc_db);
-		return NT_STATUS_UNSUCCESSFUL;
-	}
-
-	res = idmap_alloc_db->transaction_commit(idmap_alloc_db);
-	if (res != 0) {
-		DEBUG(1, (__location__ " Failed to commit transaction.\n"));
-		return NT_STATUS_UNSUCCESSFUL;
+	if (NT_STATUS_IS_OK(status)) {
+		xid->id = state.hwm;
+		DEBUG(10,("New %s = %d\n", hwmtype, state.hwm));
+	} else {
+		DEBUG(1, ("Error allocating a new %s\n", hwmtype));
 	}
 
-	xid->id = hwm;
-	DEBUG(10,("New %s = %d\n", hwmtype, hwm));
-
-	return NT_STATUS_OK;
+	return status;
 }
 
 /**********************************
-- 
cgit