1 files changed, 89 insertions, 0 deletions
diff --git a/ctdb/common/reqid.c b/ctdb/common/reqid.c
new file mode 100644
index 0000000..0e651cf
--- /dev/null
+++ b/ctdb/common/reqid.c
@@ -0,0 +1,89 @@
+/*
+   ctdb request id handling code
+
+   Copyright (C) Amitay Isaacs  2015
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+
+#include <talloc.h>
+
+#include "lib/util/idtree.h"
+#include "reqid.h"
+
+struct reqid_context {
+	struct idr_context *idr;
+	uint32_t lastid;
+};
+
+int reqid_init(TALLOC_CTX *mem_ctx, int start_id,
+	       struct reqid_context **result)
+{
+	struct reqid_context *reqid_ctx;
+
+	reqid_ctx = talloc_zero(mem_ctx, struct reqid_context);
+	if (reqid_ctx == NULL) {
+		return ENOMEM;
+	}
+
+	reqid_ctx->idr = idr_init(reqid_ctx);
+	if (reqid_ctx->idr == NULL) {
+		talloc_free(reqid_ctx);
+		return ENOMEM;
+	}
+
+	if (start_id <= 0) {
+		start_id = 1;
+	}
+	reqid_ctx->lastid = start_id;
+
+	*result = reqid_ctx;
+	return 0;
+}
+
+uint32_t reqid_new(struct reqid_context *reqid_ctx, void *private_data)
+{
+	int id;
+
+	id = idr_get_new_above(reqid_ctx->idr, private_data,
+			       reqid_ctx->lastid+1, INT_MAX);
+	if (id < 0) {
+		/* reqid wrapped */
+		id = idr_get_new(reqid_ctx->idr, private_data, INT_MAX);
+	}
+	if (id == -1) {
+		return REQID_INVALID;
+	}
+
+	reqid_ctx->lastid = id;
+	return id;
+}
+
+void *_reqid_find(struct reqid_context *reqid_ctx, uint32_t reqid)
+{
+	return idr_find(reqid_ctx->idr, reqid);
+}
+
+int reqid_remove(struct reqid_context *reqid_ctx, uint32_t reqid)
+{
+	int ret;
+
+	ret = idr_remove(reqid_ctx->idr, reqid);
+	if (ret < 0) {
+		return ENOENT;
+	}
+	return 0;
+}