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Diffstat (limited to 'include/linux/connector.h')
| -rw-r--r-- | include/linux/connector.h | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/include/linux/connector.h b/include/linux/connector.h new file mode 100644 index 00000000000..3a779ffba60 --- /dev/null +++ b/include/linux/connector.h @@ -0,0 +1,154 @@ +/* + * connector.h + * + * 2004-2005 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru> + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef __CONNECTOR_H +#define __CONNECTOR_H + +#include <linux/types.h> + +/* + * Process Events connector unique ids -- used for message routing + */ +#define CN_IDX_PROC 0x1 +#define CN_VAL_PROC 0x1 +#define CN_IDX_CIFS 0x2 +#define CN_VAL_CIFS 0x1 +#define CN_W1_IDX 0x3 /* w1 communication */ +#define CN_W1_VAL 0x1 +#define CN_IDX_V86D 0x4 +#define CN_VAL_V86D_UVESAFB 0x1 +#define CN_IDX_BB 0x5 /* BlackBoard, from the TSP GPL sampling framework */ +#define CN_DST_IDX 0x6 +#define CN_DST_VAL 0x1 +#define CN_IDX_DM 0x7 /* Device Mapper */ +#define CN_VAL_DM_USERSPACE_LOG 0x1 +#define CN_IDX_DRBD 0x8 +#define CN_VAL_DRBD 0x1 + +#define CN_NETLINK_USERS 8 + +/* + * Maximum connector's message size. + */ +#define CONNECTOR_MAX_MSG_SIZE 16384 + +/* + * idx and val are unique identifiers which + * are used for message routing and + * must be registered in connector.h for in-kernel usage. + */ + +struct cb_id { + __u32 idx; + __u32 val; +}; + +struct cn_msg { + struct cb_id id; + + __u32 seq; + __u32 ack; + + __u16 len; /* Length of the following data */ + __u16 flags; + __u8 data[0]; +}; + +#ifdef __KERNEL__ + +#include <asm/atomic.h> + +#include <linux/list.h> +#include <linux/workqueue.h> + +#include <net/sock.h> + +#define CN_CBQ_NAMELEN 32 + +struct cn_queue_dev { + atomic_t refcnt; + unsigned char name[CN_CBQ_NAMELEN]; + + struct workqueue_struct *cn_queue; + /* Sent to kevent to create cn_queue only when needed */ + struct work_struct wq_creation; + /* Tell if the wq_creation job is pending/completed */ + atomic_t wq_requested; + /* Wait for cn_queue to be created */ + wait_queue_head_t wq_created; + + struct list_head queue_list; + spinlock_t queue_lock; + + struct sock *nls; +}; + +struct cn_callback_id { + unsigned char name[CN_CBQ_NAMELEN]; + struct cb_id id; +}; + +struct cn_callback_data { + struct sk_buff *skb; + void (*callback) (struct cn_msg *, struct netlink_skb_parms *); + + void *free; +}; + +struct cn_callback_entry { + struct list_head callback_entry; + struct work_struct work; + struct cn_queue_dev *pdev; + + struct cn_callback_id id; + struct cn_callback_data data; + + u32 seq, group; +}; + +struct cn_dev { + struct cb_id id; + + u32 seq, groups; + struct sock *nls; + void (*input) (struct sk_buff *skb); + + struct cn_queue_dev *cbdev; +}; + +int cn_add_callback(struct cb_id *, char *, void (*callback) (struct cn_msg *, struct netlink_skb_parms *)); +void cn_del_callback(struct cb_id *); +int cn_netlink_send(struct cn_msg *, u32, gfp_t); + +int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(struct cn_msg *, struct netlink_skb_parms *)); +void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id); + +int queue_cn_work(struct cn_callback_entry *cbq, struct work_struct *work); + +struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *); +void cn_queue_free_dev(struct cn_queue_dev *dev); + +int cn_cb_equal(struct cb_id *, struct cb_id *); + +void cn_queue_wrapper(struct work_struct *work); + +#endif /* __KERNEL__ */ +#endif /* __CONNECTOR_H */ |