dlmcommon.h

LINUX 2.6.17.4的源码

{
	u8 master;
	u8 lockname_len;
	u8 num_locks;    // locks sent in this structure
	u8 flags;
	__be32 total_locks; // locks to be sent for this migration cookie
	__be64 mig_cookie;  // cookie for this lockres migration
			 // or zero if not needed
	// 16 bytes
	u8 lockname[DLM_LOCKID_NAME_MAX];
	// 48 bytes
	u8 lvb[DLM_LVB_LEN];
	// 112 bytes
	struct dlm_migratable_lock ml[0];  // 16 bytes each, begins at byte 112
};
#define DLM_MIG_LOCKRES_MAX_LEN  \
	(sizeof(struct dlm_migratable_lockres) + \
	 (sizeof(struct dlm_migratable_lock) * \
	  DLM_MAX_MIGRATABLE_LOCKS) )

/* from above, 128 bytes
 * for some undetermined future use */
#define DLM_MIG_LOCKRES_RESERVED   (NET_MAX_PAYLOAD_BYTES - \
				    DLM_MIG_LOCKRES_MAX_LEN)

struct dlm_create_lock
{
	__be64 cookie;

	__be32 flags;
	u8 pad1;
	u8 node_idx;
	s8 requested_type;
	u8 namelen;

	u8 name[O2NM_MAX_NAME_LEN];
};

struct dlm_convert_lock
{
	__be64 cookie;

	__be32 flags;
	u8 pad1;
	u8 node_idx;
	s8 requested_type;
	u8 namelen;

	u8 name[O2NM_MAX_NAME_LEN];

	s8 lvb[0];
};
#define DLM_CONVERT_LOCK_MAX_LEN  (sizeof(struct dlm_convert_lock)+DLM_LVB_LEN)

struct dlm_unlock_lock
{
	__be64 cookie;

	__be32 flags;
	__be16 pad1;
	u8 node_idx;
	u8 namelen;

	u8 name[O2NM_MAX_NAME_LEN];

	s8 lvb[0];
};
#define DLM_UNLOCK_LOCK_MAX_LEN  (sizeof(struct dlm_unlock_lock)+DLM_LVB_LEN)

struct dlm_proxy_ast
{
	__be64 cookie;

	__be32 flags;
	u8 node_idx;
	u8 type;
	u8 blocked_type;
	u8 namelen;

	u8 name[O2NM_MAX_NAME_LEN];

	s8 lvb[0];
};
#define DLM_PROXY_AST_MAX_LEN  (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN)

#define DLM_MOD_KEY (0x666c6172)
enum dlm_query_join_response {
	JOIN_DISALLOW = 0,
	JOIN_OK,
	JOIN_OK_NO_MAP,
};

struct dlm_lock_request
{
	u8 node_idx;
	u8 dead_node;
	__be16 pad1;
	__be32 pad2;
};

struct dlm_reco_data_done
{
	u8 node_idx;
	u8 dead_node;
	__be16 pad1;
	__be32 pad2;

	/* unused for now */
	/* eventually we can use this to attempt
	 * lvb recovery based on each node's info */
	u8 reco_lvb[DLM_LVB_LEN];
};

struct dlm_begin_reco
{
	u8 node_idx;
	u8 dead_node;
	__be16 pad1;
	__be32 pad2;
};


struct dlm_query_join_request
{
	u8 node_idx;
	u8 pad1[2];
	u8 name_len;
	u8 domain[O2NM_MAX_NAME_LEN];
};

struct dlm_assert_joined
{
	u8 node_idx;
	u8 pad1[2];
	u8 name_len;
	u8 domain[O2NM_MAX_NAME_LEN];
};

struct dlm_cancel_join
{
	u8 node_idx;
	u8 pad1[2];
	u8 name_len;
	u8 domain[O2NM_MAX_NAME_LEN];
};

struct dlm_exit_domain
{
	u8 node_idx;
	u8 pad1[3];
};

struct dlm_finalize_reco
{
	u8 node_idx;
	u8 dead_node;
	__be16 pad1;
	__be32 pad2;
};

static inline enum dlm_status
__dlm_lockres_state_to_status(struct dlm_lock_resource *res)
{
	enum dlm_status status = DLM_NORMAL;

	assert_spin_locked(&res->spinlock);

	if (res->state & DLM_LOCK_RES_RECOVERING)
		status = DLM_RECOVERING;
	else if (res->state & DLM_LOCK_RES_MIGRATING)
		status = DLM_MIGRATING;
	else if (res->state & DLM_LOCK_RES_IN_PROGRESS)
		status = DLM_FORWARD;

	return status;
}

static inline u8 dlm_get_lock_cookie_node(u64 cookie)
{
	u8 ret;
	cookie >>= 56;
	ret = (u8)(cookie & 0xffULL);
	return ret;
}

static inline unsigned long long dlm_get_lock_cookie_seq(u64 cookie)
{
	unsigned long long ret;
	ret = ((unsigned long long)cookie) & 0x00ffffffffffffffULL;
	return ret;
}

struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie,
			       struct dlm_lockstatus *lksb);
void dlm_lock_get(struct dlm_lock *lock);
void dlm_lock_put(struct dlm_lock *lock);

void dlm_lock_attach_lockres(struct dlm_lock *lock,
			     struct dlm_lock_resource *res);

int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data);
int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data);
int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data);

void dlm_revert_pending_convert(struct dlm_lock_resource *res,
				struct dlm_lock *lock);
void dlm_revert_pending_lock(struct dlm_lock_resource *res,
			     struct dlm_lock *lock);

int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data);
void dlm_commit_pending_cancel(struct dlm_lock_resource *res,
			       struct dlm_lock *lock);
void dlm_commit_pending_unlock(struct dlm_lock_resource *res,
			       struct dlm_lock *lock);

int dlm_launch_thread(struct dlm_ctxt *dlm);
void dlm_complete_thread(struct dlm_ctxt *dlm);
int dlm_launch_recovery_thread(struct dlm_ctxt *dlm);
void dlm_complete_recovery_thread(struct dlm_ctxt *dlm);
void dlm_wait_for_recovery(struct dlm_ctxt *dlm);
void dlm_kick_recovery_thread(struct dlm_ctxt *dlm);
int dlm_is_node_dead(struct dlm_ctxt *dlm, u8 node);
int dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout);

void dlm_put(struct dlm_ctxt *dlm);
struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm);
int dlm_domain_fully_joined(struct dlm_ctxt *dlm);

void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
			      struct dlm_lock_resource *res);
void dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
			    struct dlm_lock_resource *res);
void dlm_purge_lockres(struct dlm_ctxt *dlm,
		       struct dlm_lock_resource *lockres);
void dlm_lockres_get(struct dlm_lock_resource *res);
void dlm_lockres_put(struct dlm_lock_resource *res);
void __dlm_unhash_lockres(struct dlm_lock_resource *res);
void __dlm_insert_lockres(struct dlm_ctxt *dlm,
			  struct dlm_lock_resource *res);
struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
						const char *name,
						unsigned int len);
struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
					      const char *name,
					      unsigned int len);

int dlm_is_host_down(int errno);
void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
			      struct dlm_lock_resource *res,
			      u8 owner);
struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
						 const char *lockid,
						 int flags);
struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
					  const char *name,
					  unsigned int namelen);

void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
void dlm_do_local_ast(struct dlm_ctxt *dlm,
		      struct dlm_lock_resource *res,
		      struct dlm_lock *lock);
int dlm_do_remote_ast(struct dlm_ctxt *dlm,
		      struct dlm_lock_resource *res,
		      struct dlm_lock *lock);
void dlm_do_local_bast(struct dlm_ctxt *dlm,
		       struct dlm_lock_resource *res,
		       struct dlm_lock *lock,
		       int blocked_type);
int dlm_send_proxy_ast_msg(struct dlm_ctxt *dlm,
			   struct dlm_lock_resource *res,
			   struct dlm_lock *lock,
			   int msg_type,
			   int blocked_type, int flags);
static inline int dlm_send_proxy_bast(struct dlm_ctxt *dlm,
				      struct dlm_lock_resource *res,
				      struct dlm_lock *lock,
				      int blocked_type)
{
	return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_BAST,
				      blocked_type, 0);
}

static inline int dlm_send_proxy_ast(struct dlm_ctxt *dlm,
				     struct dlm_lock_resource *res,
				     struct dlm_lock *lock,
				     int flags)
{
	return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_AST,
				      0, flags);
}

void dlm_print_one_lock_resource(struct dlm_lock_resource *res);
void __dlm_print_one_lock_resource(struct dlm_lock_resource *res);

u8 dlm_nm_this_node(struct dlm_ctxt *dlm);
void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);


int dlm_nm_init(struct dlm_ctxt *dlm);
int dlm_heartbeat_init(struct dlm_ctxt *dlm);
void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data);
void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data);

int dlm_lockres_is_dirty(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
int dlm_migrate_lockres(struct dlm_ctxt *dlm,
			struct dlm_lock_resource *res,
			u8 target);
int dlm_finish_migration(struct dlm_ctxt *dlm,
			 struct dlm_lock_resource *res,
			 u8 old_master);
void dlm_lockres_release_ast(struct dlm_ctxt *dlm,
			     struct dlm_lock_resource *res);
void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res);

int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data);
int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data);
int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data);
int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data);
int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data);
int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data);
int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data);
int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data);
int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data);
int dlm_do_master_requery(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
			  u8 nodenum, u8 *real_master);
int dlm_lockres_master_requery(struct dlm_ctxt *dlm,
			       struct dlm_lock_resource *res, u8 *real_master);


int dlm_dispatch_assert_master(struct dlm_ctxt *dlm,
			       struct dlm_lock_resource *res,
			       int ignore_higher,
			       u8 request_from,
			       u32 flags);


int dlm_send_one_lockres(struct dlm_ctxt *dlm,
			 struct dlm_lock_resource *res,
			 struct dlm_migratable_lockres *mres,
			 u8 send_to,
			 u8 flags);
void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
				       struct dlm_lock_resource *res);

/* will exit holding res->spinlock, but may drop in function */
void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags);
void __dlm_wait_on_lockres_flags_set(struct dlm_lock_resource *res, int flags);

/* will exit holding res->spinlock, but may drop in function */
static inline void __dlm_wait_on_lockres(struct dlm_lock_resource *res)
{
	__dlm_wait_on_lockres_flags(res, (DLM_LOCK_RES_IN_PROGRESS|
				    	  DLM_LOCK_RES_RECOVERING|
					  DLM_LOCK_RES_MIGRATING));
}


int dlm_init_mle_cache(void);
void dlm_destroy_mle_cache(void);
void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up);
void dlm_clean_master_list(struct dlm_ctxt *dlm,
			   u8 dead_node);
int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock);


static inline const char * dlm_lock_mode_name(int mode)
{
	switch (mode) {
		case LKM_EXMODE:
			return "EX";
		case LKM_PRMODE:
			return "PR";
		case LKM_NLMODE:
			return "NL";
	}
	return "UNKNOWN";
}


static inline int dlm_lock_compatible(int existing, int request)
{
	/* NO_LOCK compatible with all */
	if (request == LKM_NLMODE ||
	    existing == LKM_NLMODE)
		return 1;

	/* EX incompatible with all non-NO_LOCK */
	if (request == LKM_EXMODE)
		return 0;

	/* request must be PR, which is compatible with PR */
	if (existing == LKM_PRMODE)
		return 1;

	return 0;
}

static inline int dlm_lock_on_list(struct list_head *head,
				   struct dlm_lock *lock)
{
	struct list_head *iter;
	struct dlm_lock *tmplock;

	list_for_each(iter, head) {
		tmplock = list_entry(iter, struct dlm_lock, list);
		if (tmplock == lock)
			return 1;
	}
	return 0;
}


static inline enum dlm_status dlm_err_to_dlm_status(int err)
{
	enum dlm_status ret;
	if (err == -ENOMEM)
		ret = DLM_SYSERR;
	else if (err == -ETIMEDOUT || o2net_link_down(err, NULL))
		ret = DLM_NOLOCKMGR;
	else if (err == -EINVAL)
		ret = DLM_BADPARAM;
	else if (err == -ENAMETOOLONG)
		ret = DLM_IVBUFLEN;
	else
		ret = DLM_BADARGS;
	return ret;
}


static inline void dlm_node_iter_init(unsigned long *map,
				      struct dlm_node_iter *iter)
{
	memcpy(iter->node_map, map, sizeof(iter->node_map));
	iter->curnode = -1;
}

static inline int dlm_node_iter_next(struct dlm_node_iter *iter)
{
	int bit;
	bit = find_next_bit(iter->node_map, O2NM_MAX_NODES, iter->curnode+1);
	if (bit >= O2NM_MAX_NODES) {
		iter->curnode = O2NM_MAX_NODES;
		return -ENOENT;
	}
	iter->curnode = bit;
	return bit;
}



#endif /* DLMCOMMON_H */