1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation; or, when distributed
* separately from the Linux kernel or incorporated into other
* software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef __BLKIF__BACKEND__COMMON_H__
#define __BLKIF__BACKEND__COMMON_H__
#include <linux/version.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/vmalloc.h>
#include <linux/wait.h>
#include <linux/io.h>
#include <asm/setup.h>
#include <asm/pgalloc.h>
#include <asm/hypervisor.h>
#include <xen/blkif.h>
#include <xen/grant_table.h>
#include <xen/xenbus.h>
#define DPRINTK(_f, _a...) \
pr_debug("(file=%s, line=%d) " _f, \
__FILE__ , __LINE__ , ## _a)
struct vbd {
blkif_vdev_t handle; /* what the domain refers to this vbd as */
unsigned char readonly; /* Non-zero -> read-only */
unsigned char type; /* VDISK_xxx */
u32 pdevice; /* phys device that this vbd maps to */
struct block_device *bdev;
sector_t size; /* Cached size parameter */
};
struct backend_info;
struct blkif_st {
/* Unique identifier for this interface. */
domid_t domid;
unsigned int handle;
/* Physical parameters of the comms window. */
unsigned int irq;
/* Comms information. */
enum blkif_protocol blk_protocol;
union blkif_back_rings blk_rings;
struct vm_struct *blk_ring_area;
/* The VBD attached to this interface. */
struct vbd vbd;
/* Back pointer to the backend_info. */
struct backend_info *be;
/* Private fields. */
spinlock_t blk_ring_lock;
atomic_t refcnt;
wait_queue_head_t wq;
/* One thread per one blkif. */
struct task_struct *xenblkd;
unsigned int waiting_reqs;
/* statistics */
unsigned long st_print;
int st_rd_req;
int st_wr_req;
int st_oo_req;
int st_br_req;
int st_rd_sect;
int st_wr_sect;
wait_queue_head_t waiting_to_free;
grant_handle_t shmem_handle;
grant_ref_t shmem_ref;
};
struct blkif_st *blkif_alloc(domid_t domid);
void blkif_disconnect(struct blkif_st *blkif);
void blkif_free(struct blkif_st *blkif);
int blkif_map(struct blkif_st *blkif, unsigned long shared_page,
unsigned int evtchn);
void vbd_resize(struct blkif_st *blkif);
#define blkif_get(_b) (atomic_inc(&(_b)->refcnt))
#define blkif_put(_b) \
do { \
if (atomic_dec_and_test(&(_b)->refcnt)) \
wake_up(&(_b)->waiting_to_free);\
} while (0)
/* Create a vbd. */
int vbd_create(struct blkif_st *blkif, blkif_vdev_t vdevice, unsigned major,
unsigned minor, int readonly, int cdrom);
void vbd_free(struct vbd *vbd);
unsigned long long vbd_size(struct vbd *vbd);
unsigned int vbd_info(struct vbd *vbd);
unsigned long vbd_secsize(struct vbd *vbd);
struct phys_req {
unsigned short dev;
unsigned short nr_sects;
struct block_device *bdev;
blkif_sector_t sector_number;
};
int vbd_translate(struct phys_req *req, struct blkif_st *blkif, int operation);
int blkif_interface_init(void);
int blkif_xenbus_init(void);
irqreturn_t blkif_be_int(int irq, void *dev_id);
int blkif_schedule(void *arg);
int blkback_barrier(struct xenbus_transaction xbt,
struct backend_info *be, int state);
struct xenbus_device *blkback_xenbus(struct backend_info *be);
#endif /* __BLKIF__BACKEND__COMMON_H__ */
|
