msgpool.h

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#ifndef _FS_CEPH_MSGPOOL
#define _FS_CEPH_MSGPOOL

#include <linux/mempool.h>
#include <linux/ceph/messenger.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 */
};

extern int ceph_msgpool_init(struct ceph_msgpool *pool, int type,
                 int front_len, int size, bool blocking,
                 const char *name);
extern void ceph_msgpool_destroy(struct ceph_msgpool *pool);
extern struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *,
                     int front_len);
extern void ceph_msgpool_put(struct ceph_msgpool *, struct ceph_msg *);

#endif