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18 #ifndef _MD_H
19 #define _MD_H
20
21 #include <asm/segment.h>
22 #include <linux/major.h>
23 #include <linux/mm.h>
24 #include <linux/ioctl.h>
25
26 #define MD_VERSION "0.34"
27
28
29 #define REGISTER_DEV _IO (MD_MAJOR, 1)
30 #define START_MD _IO (MD_MAJOR, 2)
31 #define STOP_MD _IO (MD_MAJOR, 3)
32 #define MD_INVALID _IO (MD_MAJOR, 4)
33 #define MD_VALID _IO (MD_MAJOR, 5)
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43
44
45 #define FAULT_SHIFT 8
46 #define PERSONALITY_SHIFT 16
47
48 #define FACTOR_MASK 0xFFUL
49 #define FAULT_MASK 0xFF00UL
50 #define PERSONALITY_MASK 0xFF0000UL
51
52 #define MD_RESERVED 0
53 #define LINEAR (1UL << PERSONALITY_SHIFT)
54 #define STRIPED (2UL << PERSONALITY_SHIFT)
55 #define STRIPPED STRIPED
56 #define RAID0 STRIPED
57 #define RAID1 (3UL << PERSONALITY_SHIFT)
58 #define RAID5 (4UL << PERSONALITY_SHIFT)
59 #define MAX_PERSONALITY 5
60
61 #ifdef __KERNEL__
62
63 #include <linux/config.h>
64 #include <linux/types.h>
65 #include <linux/fs.h>
66 #include <linux/blkdev.h>
67
68 #undef MD_COUNT_SIZE
69
70 #define MAX_REAL 8
71 #define MAX_MD_DEV 4
72
73 #define FACTOR(a) ((a)->repartition & FACTOR_MASK)
74 #define MAX_FAULT(a) (((a)->repartition & FAULT_MASK)>>8)
75 #define PERSONALITY(a) ((a)->repartition & PERSONALITY_MASK)
76
77 #define FACTOR_SHIFT(a) (PAGE_SHIFT + (a) - 10)
78
79
80 #define VALID 0
81 #define INVALID_NEXT 1
82 #define INVALID_ALWAYS 2
83 #define INVALID 3
84
85
86 #define REDIRECTED_BHREQ 0
87
88 #define REDIRECTED_REQ 1
89 #define REDIRECT_FAILED -1
90
91 struct real_dev
92 {
93 kdev_t dev;
94 int size;
95 int offset;
96
97 struct inode *inode;
98 int fault_count;
99 int invalid;
100
101
102
103
104 };
105
106 struct md_dev;
107
108 struct md_personality
109 {
110 char *name;
111 int (*map)(int minor, struct md_dev *md_dev, struct request *req);
112 int (*run)(int minor, struct md_dev *md_dev);
113 int (*stop)(int minor, struct md_dev *md_dev);
114 int (*status)(char *page, int minor, struct md_dev *md_dev);
115 int (*ioctl)(struct inode *inode, struct file *file,
116 unsigned int cmd, unsigned long arg);
117 int max_invalid_dev;
118 };
119
120 struct md_dev
121 {
122 struct md_personality *pers;
123 int repartition;
124 int invalid_dev_count;
125 int busy;
126 int nb_dev;
127 void *private;
128 #ifdef MD_COUNT_SIZE
129 unsigned int smallest_count;
130 unsigned int biggest_count;
131 unsigned int equal_count;
132 #endif
133 };
134
135 extern struct real_dev devices[MAX_MD_DEV][MAX_REAL];
136 extern struct md_dev md_dev[MAX_MD_DEV];
137 extern int md_size[MAX_MD_DEV];
138
139 extern void make_md_request(struct request *pending, int n);
140 extern char *partition_name (kdev_t dev);
141
142 #if defined(CONFIG_MD_SUPPORT_RAID1) || defined(CONFIG_MD_SUPPORT_RAID5)
143 extern int md_valid_device (int minor, kdev_t dev, int mode);
144 extern int md_can_reemit (int minor);
145 #endif
146
147 extern int register_md_personality (int p_num, struct md_personality *p);
148 extern int unregister_md_personality (int p_num);
149
150 #endif __KERNEL__
151 #endif _MD_H