1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _FS_CEPH_MSGPOOL
3 #define _FS_CEPH_MSGPOOL
4 
5 #include <linux/mempool.h>
6 
7 /*
8  * we use memory pools for preallocating messages we may receive, to
9  * avoid unexpected OOM conditions.
10  */
11 struct ceph_msgpool {
12 	const char *name;
13 	mempool_t *pool;
14 	int type;               /* preallocated message type */
15 	int front_len;          /* preallocated payload size */
16 	int max_data_items;
17 };
18 
19 int ceph_msgpool_init(struct ceph_msgpool *pool, int type,
20 		      int front_len, int max_data_items, int size,
21 		      const char *name);
22 extern void ceph_msgpool_destroy(struct ceph_msgpool *pool);
23 struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool, int front_len,
24 				  int max_data_items);
25 extern void ceph_msgpool_put(struct ceph_msgpool *, struct ceph_msg *);
26 
27 #endif
28