diff options
| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2010-03-22 17:23:46 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2010-03-22 17:23:46 +0000 |
| commit | 74511020dde10252f8b8e648690d99dba721de14 (patch) | |
| tree | 04fc22bc7dd5d5b8d9294b2e57985b093858bd84 /fs/ceph/msgpool.h | |
| parent | 69266866a5790080d7fe80094b28d670ff8aa765 (diff) | |
| parent | 3cc4e53f86dab635166929bfa47cc68d59b28c26 (diff) | |
Merge branch 'for-2.6.34' into for-2.6.35
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 00000000000..bc834bfcd72 --- /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 |