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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 <xen/evtchn.h>
41 #include <asm/hypervisor.h>
42 #include <xen/blkif.h>
43 #include <xen/gnttab.h>
44 #include <xen/driver_util.h>
45 #include <xen/xenbus.h>
46 #include "blkback-pagemap.h"
49 #define DPRINTK(_f, _a...) \
50 pr_debug("(file=%s, line=%d) " _f, \
51 __FILE__ , __LINE__ , ## _a )
54 blkif_vdev_t handle; /* what the domain refers to this vbd as */
55 unsigned char readonly; /* Non-zero -> read-only */
56 unsigned char type; /* VDISK_xxx */
57 u32 pdevice; /* phys device that this vbd maps to */
58 struct block_device *bdev;
59 sector_t size; /* Cached size parameter */
64 typedef struct blkif_st {
65 /* Unique identifier for this interface. */
68 /* Physical parameters of the comms window. */
70 /* Comms information. */
71 enum blkif_protocol blk_protocol;
72 blkif_back_rings_t blk_rings;
73 struct vm_struct *blk_ring_area;
74 /* The VBD attached to this interface. */
76 /* Back pointer to the backend_info. */
77 struct backend_info *be;
79 spinlock_t blk_ring_lock;
83 struct task_struct *xenblkd;
84 unsigned int waiting_reqs;
85 struct request_queue *plug;
87 blkif_request_t suspended_req;
90 unsigned long st_print;
99 wait_queue_head_t waiting_to_free;
101 grant_handle_t shmem_handle;
102 grant_ref_t shmem_ref;
107 struct xenbus_device *dev;
109 struct xenbus_watch backend_watch;
110 struct xenbus_watch cdrom_watch;
116 blkif_t *blkif_alloc(domid_t domid);
117 void blkif_disconnect(blkif_t *blkif);
118 void blkif_free(blkif_t *blkif);
119 int blkif_map(blkif_t *blkif, unsigned long shared_page, unsigned int evtchn);
120 void vbd_resize(blkif_t *blkif);
122 #define blkif_get(_b) (atomic_inc(&(_b)->refcnt))
123 #define blkif_put(_b) \
125 if (atomic_dec_and_test(&(_b)->refcnt)) \
126 wake_up(&(_b)->waiting_to_free);\
130 int vbd_create(blkif_t *blkif, blkif_vdev_t vdevice, unsigned major,
131 unsigned minor, int readonly, int cdrom);
132 void vbd_free(struct vbd *vbd);
134 unsigned long long vbd_size(struct vbd *vbd);
135 unsigned int vbd_info(struct vbd *vbd);
136 unsigned long vbd_secsize(struct vbd *vbd);
140 unsigned short nr_sects;
141 struct block_device *bdev;
142 blkif_sector_t sector_number;
145 int vbd_translate(struct phys_req *req, blkif_t *blkif, int operation);
147 void blkif_interface_init(void);
149 void blkif_xenbus_init(void);
151 irqreturn_t blkif_be_int(int irq, void *dev_id);
152 int blkif_schedule(void *arg);
154 int blkback_barrier(struct xenbus_transaction xbt,
155 struct backend_info *be, int state);
157 /* cdrom media change */
158 void cdrom_add_media_watch(struct backend_info *be);
160 #endif /* __BLKIF__BACKEND__COMMON_H__ */