blob: c6216e208d5cd8b1abf7f8ed1d9aa8c032ad6224 (
plain)
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
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
#ifdef DEVFS_DEBUG
#define DBPRINT(A) printf(A)
#else
#define DBPRINT(A)
#endif
/*
* Written by Julian Elischer (julian@DIALIX.oz.au)
*
* $Header: /home/ncvs/src/sys/miscfs/devfs/devfsdefs.h,v 1.3 1995/05/03 23:06:31 julian Exp $
*/
/* first a couple of defines for compatibility with inodes */
#define ISUID 04000 /* set user identifier when exec'ing */
#define ISGID 02000 /* set group identifier when exec'ing */
#define ISVTX 01000 /* save execution information on exit */
#define IREAD 0400 /* read permission */
#define IWRITE 0200 /* write permission */
#define IEXEC 0100 /* execute permission */
#define ILOCKED 0x0001 /* inode is locked */
#define IWANT 0x0002 /* some process waiting on lock */
#define IRENAME 0x0004 /* inode is being renamed */
#define IUPD 0x0010 /* file has been modified */
#define IACC 0x0020 /* inode access time to be updated */
#define ICHG 0x0040 /* inode has been changed */
#define IMOD 0x0080 /* inode has been modified */
#define ISHLOCK 0x0100 /* file has shared lock */
#define IEXLOCK 0x0200 /* file has exclusive lock */
#define ILWAIT 0x0400 /* someone waiting on file lock */
/*
* Lock and unlock inodes.
*/
#ifdef notdef
#define DNLOCK(ip) { \
while ((ip)->i_flag & ILOCKED) { \
(ip)->i_flag |= IWANT; \
(void) sleep((caddr_t)(ip), PINOD); \
} \
(ip)->i_flag |= ILOCKED; \
}
#define DNUNLOCK(ip) { \
(ip)->i_flag &= ~ILOCKED; \
if ((ip)->i_flag&IWANT) { \
(ip)->i_flag &= ~IWANT; \
wakeup((caddr_t)(ip)); \
} \
}
#else
#define DNLOCK(ip)
#define DNUNLOCK(ip)
#endif
#define DEVMAXNAMESIZE 32
#define DEVMAXPATHSIZE 128
#define DEV_DIR 1
#define DEV_BDEV 2
#define DEV_CDEV 3
#define DEV_DDEV 4
#define DEV_ALIAS 5
#define DEV_SLNK 6
extern int (**devfs_vnodeop_p)(); /* our own vector array for dirs */
extern int (**dev_spec_vnodeop_p)(); /* our own vector array for devs */
typedef struct dev_name *devnm_p;
typedef struct devnode *dn_p;
struct devnode /* the equivalent of an INODE */
{
u_short type;
int flags; /* more inode compatible for now *//*XXXkill*/
u_short mode; /* basically inode compatible (drwxrwxrwx) */
u_short uid; /* basically inode compatible */
u_short gid; /* basically inode compatible */
struct timespec atime; /* time of last access */
struct timespec mtime; /* time of last modification */
struct timespec ctime; /* time file changed */
int links; /* how many file links does this node have? */
struct devfsmount *dvm; /* the mount structure for this 'plane' */
struct vnode *vn; /* address of last vnode that represented us */
u_long vn_id; /* make sure we have the right vnode */
int (***ops)(); /* yuk... pointer to pointer(s) to funcs */
int len; /* of any associated info (e.g. dir data) */
union typeinfo {
struct {
struct cdevsw *cdevsw;
dev_t dev;
}Cdev;
struct {
struct bdevsw *bdevsw;
dev_t dev;
}Bdev;
struct {
int (***ops)(); /* duplicate, used in dev_add_node */
int arg;
}Ddev;
struct {
devnm_p dirlist;
devnm_p *dirlast;
dn_p parent;
devnm_p myname;
int entrycount;
}Dir;
struct {
char *name; /* must be allocated separatly */
int namelen;
}Slnk;
struct {
devnm_p realthing;
devnm_p next;
}Alias;
}by;
};
typedef struct devnode devnode_t;
struct dev_name
{
/*-----------------------directory entry fields-------------*/
char name[DEVMAXNAMESIZE];
dn_p dnp; /* the "inode" (devnode) pointer */
dn_p parent; /* backpointer to the directory itself */
devnm_p next; /* next object in this directory */
devnm_p *prevp; /* previous pointer in directory linked list */
/*-----------------------aliases or backing nodes----------*/
union {
struct {
devnm_p aliases; /* aliase chain (kill with us)*/
int alias_count; /* # 'alias' nodes for us. */
} back;
struct {
devnm_p realthing; /* ptr to the backing node */
devnm_p file_node; /* our file node */
} front;
} as;
/*-----------------------the front-back chain-------------*/
devnm_p next_front; /* the linked list of all our front nodes */
devnm_p *prev_frontp; /* the end of the front node chain */
int frontcount; /* number of front nodes that reference us*/
};
typedef struct dev_name devnm_t;
extern devnm_p dev_root;
/*
* Rules for front nodes:
* Dirs hava a strict 1:1 relationship with their OWN devnode
* Symlinks similarly
* Device Nodes ALWAYS point to the devnode that is linked
* to the Backing node. (with a ref count)
*/
/*
* DEVFS specific per/mount information, used to link a monted fs to a
* particular 'plane' of front nodes.
*/
struct devfsmount
{
struct mount *mount; /* vfs mount struct for this fs */
devnm_p plane_root; /* the root of this 'plane' */
int flags; /* usefule some day 8-) */
};
struct dev_vn_data
{
char magic[6]; /* = "devfs" if correct */
devnm_p front;
devnm_p back;
};
extern struct vnodeops spec_vnodeops,devfs_vnodeops;
/*
* Prototypes for DEVFS virtual filesystem operations
*/
#include "devfs_proto.h"
|
