include/linux/ceph/msgpool.h

   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 };
  17
  18 extern int ceph_msgpool_init(struct ceph_msgpool *pool, int type,
  19                              int front_len, int size, bool blocking,
  20                              const char *name);
  21 extern void ceph_msgpool_destroy(struct ceph_msgpool *pool);
  22 extern struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *,
  23                                          int front_len);
  24 extern void ceph_msgpool_put(struct ceph_msgpool *, struct ceph_msg *);
  25
  26 #endif