diff options
Diffstat (limited to 'fs/ceph/msgpool.h')
| -rw-r--r-- | fs/ceph/msgpool.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/fs/ceph/msgpool.h b/fs/ceph/msgpool.h new file mode 100644 index 000000000000..bc834bfcd720 --- /dev/null +++ b/fs/ceph/msgpool.h @@ -0,0 +1,27 @@ +#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 |