2 * This program is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU General Public License version 2
4 * as published by the Free Software Foundation; or, when distributed
5 * separately from the Linux kernel or incorporated into other
6 * software packages, subject to the following license:
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this source file (the "Software"), to deal in the Software without
10 * restriction, including without limitation the rights to use, copy, modify,
11 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
12 * and to permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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(_f, _a...) \
46 pr_debug("(file=%s, line=%d) " _f, \
47 __FILE__ , __LINE__ , ## _a )
50 blkif_vdev_t handle
; /* what the domain refers to this vbd as */
51 unsigned char readonly
; /* Non-zero -> read-only */
52 unsigned char type
; /* VDISK_xxx */
53 u32 pdevice
; /* phys device that this vbd maps to */
54 struct block_device
*bdev
;
55 sector_t size
; /* Cached size parameter */
60 typedef struct blkif_st
{
61 /* Unique identifier for this interface. */
64 /* Physical parameters of the comms window. */
66 /* Comms information. */
67 enum blkif_protocol blk_protocol
;
68 union blkif_back_rings blk_rings
;
69 struct vm_struct
*blk_ring_area
;
70 /* The VBD attached to this interface. */
72 /* Back pointer to the backend_info. */
73 struct backend_info
*be
;
75 spinlock_t blk_ring_lock
;
79 /* One thread per one blkif. */
80 struct task_struct
*xenblkd
;
81 unsigned int waiting_reqs
;
82 struct request_queue
*plug
;
85 unsigned long st_print
;
93 wait_queue_head_t waiting_to_free
;
95 grant_handle_t shmem_handle
;
96 grant_ref_t shmem_ref
;
99 blkif_t
*blkif_alloc(domid_t domid
);
100 void blkif_disconnect(blkif_t
*blkif
);
101 void blkif_free(blkif_t
*blkif
);
102 int blkif_map(blkif_t
*blkif
, unsigned long shared_page
, unsigned int evtchn
);
103 void vbd_resize(blkif_t
*blkif
);
105 #define blkif_get(_b) (atomic_inc(&(_b)->refcnt))
106 #define blkif_put(_b) \
108 if (atomic_dec_and_test(&(_b)->refcnt)) \
109 wake_up(&(_b)->waiting_to_free);\
113 int vbd_create(blkif_t
*blkif
, blkif_vdev_t vdevice
, unsigned major
,
114 unsigned minor
, int readonly
, int cdrom
);
115 void vbd_free(struct vbd
*vbd
);
117 unsigned long long vbd_size(struct vbd
*vbd
);
118 unsigned int vbd_info(struct vbd
*vbd
);
119 unsigned long vbd_secsize(struct vbd
*vbd
);
123 unsigned short nr_sects
;
124 struct block_device
*bdev
;
125 blkif_sector_t sector_number
;
128 int vbd_translate(struct phys_req
*req
, blkif_t
*blkif
, int operation
);
130 int blkif_interface_init(void);
132 int blkif_xenbus_init(void);
134 irqreturn_t
blkif_be_int(int irq
, void *dev_id
);
135 int blkif_schedule(void *arg
);
137 int blkback_barrier(struct xenbus_transaction xbt
,
138 struct backend_info
*be
, int state
);
140 struct xenbus_device
*blkback_xenbus(struct backend_info
*be
);
142 #endif /* __BLKIF__BACKEND__COMMON_H__ */