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5 * separately from the Linux kernel or incorporated into other
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15 * The above copyright notice and this permission notice shall be included in
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27 #ifndef __BLKIF__BACKEND__COMMON_H__
28 #define __BLKIF__BACKEND__COMMON_H__
30 #include <linux/version.h>
31 #include <linux/module.h>
32 #include <linux/interrupt.h>
33 #include <linux/slab.h>
34 #include <linux/blkdev.h>
35 #include <linux/vmalloc.h>
36 #include <linux/wait.h>
38 #include <asm/setup.h>
39 #include <asm/pgalloc.h>
40 #include <asm/hypervisor.h>
41 #include <xen/blkif.h>
42 #include <xen/grant_table.h>
43 #include <xen/xenbus.h>
45 #define DPRINTK(fmt, args...) \
46 pr_debug("xen-blkback: (%s:%d) " fmt ".\n", \
47 __func__, __LINE__, ##args)
50 /* What the domain refers to this vbd as. */
52 /* Non-zero -> read-only */
53 unsigned char readonly;
56 /* phys device that this vbd maps to. */
58 struct block_device *bdev;
59 /* Cached size parameter. */
67 /* Unique identifier for this interface. */
70 /* Physical parameters of the comms window. */
72 /* Comms information. */
73 enum blkif_protocol blk_protocol;
74 union blkif_back_rings blk_rings;
75 struct vm_struct *blk_ring_area;
76 /* The VBD attached to this interface. */
78 /* Back pointer to the backend_info. */
79 struct backend_info *be;
81 spinlock_t blk_ring_lock;
85 /* One thread per one blkif. */
86 struct task_struct *xenblkd;
87 unsigned int waiting_reqs;
90 unsigned long st_print;
98 wait_queue_head_t waiting_to_free;
100 grant_handle_t shmem_handle;
101 grant_ref_t shmem_ref;
105 #define vbd_sz(_v) ((_v)->bdev->bd_part ? \
106 (_v)->bdev->bd_part->nr_sects : \
107 get_capacity((_v)->bdev->bd_disk))
109 #define xen_blkif_get(_b) (atomic_inc(&(_b)->refcnt))
110 #define xen_blkif_put(_b) \
112 if (atomic_dec_and_test(&(_b)->refcnt)) \
113 wake_up(&(_b)->waiting_to_free);\
118 unsigned short nr_sects;
119 struct block_device *bdev;
120 blkif_sector_t sector_number;
122 int xen_blkif_interface_init(void);
124 int xen_blkif_xenbus_init(void);
126 irqreturn_t xen_blkif_be_int(int irq, void *dev_id);
127 int xen_blkif_schedule(void *arg);
129 int xen_blkbk_flush_diskcache(struct xenbus_transaction xbt,
130 struct backend_info *be, int state);
132 struct xenbus_device *xen_blkbk_xenbus(struct backend_info *be);
134 #endif /* __BLKIF__BACKEND__COMMON_H__ */