1 files changed, 27 insertions, 0 deletions
diff --git a/include/linux/ceph/msgpool.h b/include/linux/ceph/msgpool.h
new file mode 100644
index 000000000..729cdf700
--- /dev/null
+++ b/include/linux/ceph/msgpool.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _FS_CEPH_MSGPOOL
+#define _FS_CEPH_MSGPOOL
+
+#include <linux/mempool.h>
+
+/*
+ * we use memory pools for preallocating messages we may receive, to
+ * avoid unexpected OOM conditions.
+ */
+struct ceph_msgpool {
+	const char *name;
+	mempool_t *pool;
+	int type;               /* preallocated message type */
+	int front_len;          /* preallocated payload size */
+	int max_data_items;
+};
+
+int ceph_msgpool_init(struct ceph_msgpool *pool, int type,
+		      int front_len, int max_data_items, int size,
+		      const char *name);
+extern void ceph_msgpool_destroy(struct ceph_msgpool *pool);
+struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool, int front_len,
+				  int max_data_items);
+extern void ceph_msgpool_put(struct ceph_msgpool *, struct ceph_msg *);
+
+#endif