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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
/******************************************************************************
* xl_scsi.c
*
* Xenolinux virtual SCSI block-device driver.
*/
#include "xl_block.h"
#define MAJOR_NR XLSCSI_MAJOR
#include <linux/blk.h>
#define XLSCSI_MAX 256
#define XLSCSI_MAJOR_NAME "sd"
static int xlscsi_blksize_size[XLSCSI_MAX];
static int xlscsi_hardsect_size[XLSCSI_MAX];
static int xlscsi_max_sectors[XLSCSI_MAX];
struct gendisk *xlscsi_gendisk = NULL;
static struct block_device_operations xlscsi_block_fops =
{
open: xenolinux_block_open,
release: xenolinux_block_release,
ioctl: xenolinux_block_ioctl,
check_media_change: xenolinux_block_check,
revalidate: xenolinux_block_revalidate,
};
/* tiny inteface fn */
int xlscsi_hwsect(int minor)
{
return xlscsi_hardsect_size[minor];
}
int xlscsi_init(xen_disk_info_t *xdi)
{
int i, result, units, minors, disk;
struct gendisk *gd;
/* If we don't have any usable SCSI devices we may as well bail now. */
units = 0;
for ( i = 0; i < xdi->count; i++ )
if ( IS_SCSI_XENDEV(xdi->disks[i].device) &&
((xdi->disks[i].device & XENDEV_IDX_MASK) <
XLSCSI_DEVS_PER_MAJOR) )
units++;
if ( units == 0 ) return 0;
SET_MODULE_OWNER(&xlscsi_block_fops);
result = register_blkdev(XLSCSI_MAJOR, XLSCSI_MAJOR_NAME,
&xlscsi_block_fops);
if ( result < 0 )
{
printk (KERN_ALERT "XL SCSI: can't get major %d\n", XLSCSI_MAJOR);
return result;
}
/* Initialize global arrays. */
for ( i = 0; i < XLSCSI_MAX; i++ )
{
xlscsi_blksize_size[i] = 1024; //XXX 512;
xlscsi_hardsect_size[i] = 512;
xlscsi_max_sectors[i] = 128*8; //XXX 128
}
blk_size[XLSCSI_MAJOR] = NULL;
blksize_size[XLSCSI_MAJOR] = xlscsi_blksize_size;
hardsect_size[XLSCSI_MAJOR] = xlscsi_hardsect_size;
max_sectors[XLSCSI_MAJOR] = xlscsi_max_sectors;
read_ahead[XLSCSI_MAJOR] = NULL; //XXX8;
blk_init_queue(BLK_DEFAULT_QUEUE(XLSCSI_MAJOR), do_xlblk_request);
/*
* Turn off barking 'headactive' mode. We dequeue buffer heads as
* soon as we pass them down to Xen.
*/
blk_queue_headactive(BLK_DEFAULT_QUEUE(XLSCSI_MAJOR), 0);
units = XLSCSI_MAX >> XLSCSI_PARTN_SHIFT;
/* Construct an appropriate gendisk structure. */
minors = units * (1<<XLSCSI_PARTN_SHIFT);
gd = kmalloc(sizeof(struct gendisk), GFP_KERNEL);
gd->sizes = kmalloc(minors * sizeof(int), GFP_KERNEL);
gd->part = kmalloc(minors * sizeof(struct hd_struct), GFP_KERNEL);
gd->major = XLSCSI_MAJOR;
gd->major_name = XLSCSI_MAJOR_NAME;
gd->minor_shift = XLSCSI_PARTN_SHIFT;
gd->max_p = 1<<XLSCSI_PARTN_SHIFT;
gd->nr_real = units;
gd->real_devices = kmalloc(units * sizeof(xl_disk_t), GFP_KERNEL);
gd->next = NULL;
gd->fops = &xlscsi_block_fops;
gd->de_arr = kmalloc(sizeof(*gd->de_arr) * units, GFP_KERNEL);
gd->flags = kmalloc(sizeof(*gd->flags) * units, GFP_KERNEL);
memset(gd->sizes, 0, minors * sizeof(int));
memset(gd->part, 0, minors * sizeof(struct hd_struct));
memset(gd->de_arr, 0, sizeof(*gd->de_arr) * units);
memset(gd->flags, 0, sizeof(*gd->flags) * units);
memset(gd->real_devices, 0, sizeof(xl_disk_t) * units);
xlscsi_gendisk = gd;
add_gendisk(gd);
/* Now register each disk in turn. */
for ( i = 0; i < xdi->count; i++ )
{
disk = xdi->disks[i].device & XENDEV_IDX_MASK;
if ( !IS_SCSI_XENDEV(xdi->disks[i].device) ||
(disk >= XLSCSI_DEVS_PER_MAJOR) )
continue;
((xl_disk_t *)gd->real_devices)[disk].capacity =
xdi->disks[i].capacity;
register_disk(gd,
MKDEV(XLSCSI_MAJOR, disk<<XLSCSI_PARTN_SHIFT),
1<<XLSCSI_PARTN_SHIFT,
&xlscsi_block_fops,
xdi->disks[i].capacity);
}
printk(KERN_ALERT
"XenoLinux Virtual SCSI Device Driver installed [device: %d]\n",
XLSCSI_MAJOR);
return 0;
}
void xlscsi_cleanup(void)
{
if ( xlscsi_gendisk == NULL ) return;
blk_cleanup_queue(BLK_DEFAULT_QUEUE(XLSCSI_MAJOR));
xlscsi_gendisk = NULL;
read_ahead[XLSCSI_MAJOR] = 0;
if ( blksize_size[XLSCSI_MAJOR] != NULL )
{
kfree(blksize_size[XLSCSI_MAJOR]);
blksize_size[XLSCSI_MAJOR] = NULL;
}
if ( hardsect_size[XLSCSI_MAJOR] != NULL )
{
kfree(hardsect_size[XLSCSI_MAJOR]);
hardsect_size[XLSCSI_MAJOR] = NULL;
}
if ( max_sectors[XLSCSI_MAJOR] != NULL )
{
kfree(max_sectors[XLSCSI_MAJOR]);
max_sectors[XLSCSI_MAJOR] = NULL;
}
if ( unregister_blkdev(XLSCSI_MAJOR, XLSCSI_MAJOR_NAME) != 0 )
{
printk(KERN_ALERT
"XenoLinux Virtual SCSI Device Driver uninstalled w/ errs\n");
}
}
|
