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27 #ifndef __BLKIF__BACKEND__COMMON_H__
28 #define __BLKIF__BACKEND__COMMON_H__
30 #include <linux/interrupt.h>
31 #include <linux/slab.h>
32 #include <linux/blkdev.h>
33 #include <asm/hypervisor.h>
34 #include <xen/blkif.h>
35 #include <xen/xenbus.h>
36 #include <xen/interface/event_channel.h>
38 #define DPRINTK(_f, _a...) pr_debug("(file=%s, line=%d) " _f, \
39 __FILE__ , __LINE__ , ## _a )
41 #define WPRINTK(fmt, args...) pr_warning("blktap: " fmt, ##args)
45 typedef struct blkif_st {
46 /* Unique identifier for this interface. */
49 /* Physical parameters of the comms window. */
51 /* Comms information. */
52 enum blkif_protocol blk_protocol;
53 blkif_back_rings_t blk_rings;
54 struct vm_struct *blk_ring_area;
55 /* Back pointer to the backend_info. */
56 struct backend_info *be;
58 spinlock_t blk_ring_lock;
62 struct task_struct *xenblkd;
63 unsigned int waiting_reqs;
64 struct request_queue *plug;
67 unsigned long st_print;
75 wait_queue_head_t waiting_to_free;
81 blkif_t *tap_alloc_blkif(domid_t domid);
82 void tap_blkif_free(blkif_t *, struct xenbus_device *);
83 void tap_blkif_kmem_cache_free(blkif_t *blkif);
84 int tap_blkif_map(blkif_t *, struct xenbus_device *, grant_ref_t,
87 #define blkif_get(_b) (atomic_inc(&(_b)->refcnt))
88 #define blkif_put(_b) \
90 if (atomic_dec_and_test(&(_b)->refcnt)) \
91 wake_up(&(_b)->waiting_to_free);\
97 unsigned short nr_sects;
98 struct block_device *bdev;
99 blkif_sector_t sector_number;
102 void tap_blkif_interface_init(void);
104 void tap_blkif_xenbus_init(void);
106 irqreturn_t tap_blkif_be_int(int irq, void *dev_id);
107 int tap_blkif_schedule(void *arg);
109 int dom_to_devid(domid_t domid, int xenbus_id, blkif_t *blkif);
110 void signal_tapdisk(int idx);
112 #endif /* __BLKIF__BACKEND__COMMON_H__ */