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27 #ifndef __BLKIF__BACKEND__COMMON_H__
28 #define __BLKIF__BACKEND__COMMON_H__
30 #include <linux/config.h>
31 #include <linux/version.h>
32 #include <linux/module.h>
33 #include <linux/interrupt.h>
34 #include <linux/slab.h>
35 #include <linux/blkdev.h>
36 #include <linux/vmalloc.h>
37 #include <linux/wait.h>
39 #include <asm/setup.h>
40 #include <asm/pgalloc.h>
41 #include <xen/evtchn.h>
42 #include <asm/hypervisor.h>
43 #include <xen/interface/io/blkif.h>
44 #include <xen/interface/io/ring.h>
45 #include <xen/gnttab.h>
46 #include <xen/driver_util.h>
48 #define DPRINTK(_f, _a...) \
49 pr_debug("(file=%s, line=%d) " _f, \
50 __FILE__ , __LINE__ , ## _a )
53 blkif_vdev_t handle; /* what the domain refers to this vbd as */
54 unsigned char readonly; /* Non-zero -> read-only */
55 unsigned char type; /* VDISK_xxx */
56 u32 pdevice; /* phys device that this vbd maps to */
57 struct block_device *bdev;
62 typedef struct blkif_st {
63 /* Unique identifier for this interface. */
66 /* Physical parameters of the comms window. */
69 /* Comms information. */
70 blkif_back_ring_t blk_ring;
71 struct vm_struct *blk_ring_area;
72 /* The VBD attached to this interface. */
74 /* Back pointer to the backend_info. */
75 struct backend_info *be;
77 spinlock_t blk_ring_lock;
81 struct task_struct *xenblkd;
82 unsigned int waiting_reqs;
83 request_queue_t *plug;
86 unsigned long st_print;
91 wait_queue_head_t waiting_to_free;
93 grant_handle_t shmem_handle;
94 grant_ref_t shmem_ref;
97 blkif_t *blkif_alloc(domid_t domid);
98 void blkif_disconnect(blkif_t *blkif);
99 void blkif_free(blkif_t *blkif);
100 int blkif_map(blkif_t *blkif, unsigned long shared_page, unsigned int evtchn);
102 #define blkif_get(_b) (atomic_inc(&(_b)->refcnt))
103 #define blkif_put(_b) \
105 if (atomic_dec_and_test(&(_b)->refcnt)) \
106 wake_up(&(_b)->waiting_to_free);\
110 int vbd_create(blkif_t *blkif, blkif_vdev_t vdevice, unsigned major,
111 unsigned minor, int readonly);
112 void vbd_free(struct vbd *vbd);
114 unsigned long vbd_size(struct vbd *vbd);
115 unsigned int vbd_info(struct vbd *vbd);
116 unsigned long vbd_secsize(struct vbd *vbd);
120 unsigned short nr_sects;
121 struct block_device *bdev;
122 blkif_sector_t sector_number;
125 int vbd_translate(struct phys_req *req, blkif_t *blkif, int operation);
127 void blkif_interface_init(void);
129 void blkif_xenbus_init(void);
131 irqreturn_t blkif_be_int(int irq, void *dev_id, struct pt_regs *regs);
132 int blkif_schedule(void *arg);
134 #endif /* __BLKIF__BACKEND__COMMON_H__ */