[linux-2.6-block.git] / fs / ceph / msgpool.h

#ifndef _FS_CEPH_MSGPOOL
#define _FS_CEPH_MSGPOOL

#include "messenger.h"

/*
 * we use memory pools for preallocating messages we may receive, to
 * avoid unexpected OOM conditions.
 */
struct ceph_msgpool {
	spinlock_t lock;
	int front_len;          /* preallocated payload size */
	struct list_head msgs;  /* msgs in the pool; each has 1 ref */
	int num, min;           /* cur, min # msgs in the pool */
	bool blocking;
	wait_queue_head_t wait;
};

extern int ceph_msgpool_init(struct ceph_msgpool *pool,
			     int front_len, int size, bool blocking);
extern void ceph_msgpool_destroy(struct ceph_msgpool *pool);
extern int ceph_msgpool_resv(struct ceph_msgpool *, int delta);
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
Commit	Line	Data
8fc91fd8 SW	1	#ifndef _FS_CEPH_MSGPOOL
	2	#define _FS_CEPH_MSGPOOL
	3
	4	#include "messenger.h"
	5
	6	/*
	7	* we use memory pools for preallocating messages we may receive, to
	8	* avoid unexpected OOM conditions.
	9	*/
	10	struct ceph_msgpool {
	11	spinlock_t lock;
	12	int front_len; /* preallocated payload size */
	13	struct list_head msgs; /* msgs in the pool; each has 1 ref */
	14	int num, min; /* cur, min # msgs in the pool */
	15	bool blocking;
	16	wait_queue_head_t wait;
	17	};
	18
	19	extern int ceph_msgpool_init(struct ceph_msgpool *pool,
	20	int front_len, int size, bool blocking);
	21	extern void ceph_msgpool_destroy(struct ceph_msgpool *pool);
	22	extern int ceph_msgpool_resv(struct ceph_msgpool *, int delta);
8f3bc053 SW	23	extern struct ceph_msg ceph_msgpool_get(struct ceph_msgpool ,
8f3bc053 SW	24	int front_len);
8fc91fd8 SW	25	extern void ceph_msgpool_put(struct ceph_msgpool , struct ceph_msg );
	26
	27	#endif