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5 * separately from the Linux kernel or incorporated into other
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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 <linux/wait.h>
34 #include <asm/hypervisor.h>
35 #include <xen/blkif.h>
36 #include <xen/xenbus.h>
37 #include <xen/interface/event_channel.h>
38 #include "blkback-pagemap.h"
41 #define DPRINTK(_f, _a...) \
42 pr_debug("(file=%s, line=%d) " _f, \
43 __FILE__ , __LINE__ , ## _a )
45 enum blkif_backend_type {
46 BLKIF_BACKEND_PHY = 1,
47 BLKIF_BACKEND_FILE = 2,
51 blkif_vdev_t handle; /* what the domain refers to this vbd as */
52 fmode_t mode; /* FMODE_xxx */
53 unsigned char type; /* VDISK_xxx */
56 u32 pdevice; /* phys device that this vbd maps to */
57 struct block_device *bdev;
58 sector_t size; /* Cached size parameter */
63 typedef struct blkif_st {
64 /* Unique identifier for this interface. */
67 /* Physical parameters of the comms window. */
69 /* Comms information. */
70 enum blkif_protocol blk_protocol;
71 enum blkif_backend_type blk_backend_type;
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 /* for barrier (drain) requests */
84 struct completion drain_complete;
86 struct task_struct *xenblkd;
87 unsigned int waiting_reqs;
88 struct request_queue *plug;
91 unsigned long st_print;
102 wait_queue_head_t waiting_to_free;
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, grant_ref_t, evtchn_port_t);
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, fmode_t mode, bool cdrom);
132 void vbd_free(struct vbd *vbd);
134 unsigned long long vbd_size(struct vbd *vbd);
135 unsigned long vbd_secsize(struct vbd *vbd);
139 blkif_sector_t nr_sects;
140 struct block_device *bdev;
141 blkif_sector_t sector_number;
144 int vbd_translate(struct phys_req *req, blkif_t *blkif, int operation);
146 void blkif_interface_init(void);
148 void blkif_xenbus_init(void);
150 irqreturn_t blkif_be_int(int irq, void *dev_id);
151 int blkif_schedule(void *arg);
153 int blkback_barrier(struct xenbus_transaction xbt,
154 struct backend_info *be, int state);
155 int blkback_flush_diskcache(struct xenbus_transaction,
156 struct backend_info *, int state);
158 /* cdrom media change */
159 void cdrom_add_media_watch(struct backend_info *be);
161 #endif /* __BLKIF__BACKEND__COMMON_H__ */