Commit | Line | Data |
---|---|---|
f1b39b19 KT |
1 | # |
2 | /* | |
3 | */ | |
4 | ||
5 | #include "../param.h" | |
6 | #include "../systm.h" | |
7 | #include "../reg.h" | |
8 | #include "../buf.h" | |
9 | #include "../filsys.h" | |
10 | #include "../user.h" | |
11 | #include "../inode.h" | |
12 | #include "../file.h" | |
13 | #include "../conf.h" | |
14 | ||
15 | /* | |
16 | * the fstat system call. | |
17 | */ | |
18 | fstat() | |
19 | { | |
20 | register *fp; | |
21 | ||
22 | fp = getf(u.u_ar0[R0]); | |
23 | if(fp == NULL) | |
24 | return; | |
25 | stat1(fp->f_inode, u.u_arg[0]); | |
26 | } | |
27 | ||
28 | /* | |
29 | * the stat system call. | |
30 | */ | |
31 | stat() | |
32 | { | |
33 | register ip; | |
34 | extern uchar; | |
35 | ||
36 | ip = namei(&uchar, 0); | |
37 | if(ip == NULL) | |
38 | return; | |
39 | stat1(ip, u.u_arg[1]); | |
40 | iput(ip); | |
41 | } | |
42 | ||
43 | /* | |
44 | * The basic routine for fstat and stat: | |
45 | * get the inode and pass appropriate parts back. | |
46 | */ | |
47 | stat1(ip, ub) | |
48 | int *ip; | |
49 | { | |
50 | register i, *bp, *cp; | |
51 | ||
52 | iupdat(ip, time); | |
53 | bp = bread(ip->i_dev, ldiv(ip->i_number+31, 16)); | |
54 | cp = bp->b_addr + 32*lrem(ip->i_number+31, 16) + 24; | |
55 | ip = &(ip->i_dev); | |
56 | for(i=0; i<14; i++) { | |
57 | suword(ub, *ip++); | |
58 | ub =+ 2; | |
59 | } | |
60 | for(i=0; i<4; i++) { | |
61 | suword(ub, *cp++); | |
62 | ub =+ 2; | |
63 | } | |
64 | brelse(bp); | |
65 | } | |
66 | ||
67 | /* | |
68 | * the dup system call. | |
69 | */ | |
70 | dup() | |
71 | { | |
72 | register i, *fp; | |
73 | ||
74 | fp = getf(u.u_ar0[R0]); | |
75 | if(fp == NULL) | |
76 | return; | |
77 | if ((i = ufalloc()) < 0) | |
78 | return; | |
79 | u.u_ofile[i] = fp; | |
80 | fp->f_count++; | |
81 | } | |
82 | ||
83 | /* | |
84 | * the mount system call. | |
85 | */ | |
86 | smount() | |
87 | { | |
88 | int d; | |
89 | register *ip; | |
90 | register struct mount *mp, *smp; | |
91 | extern uchar; | |
92 | ||
93 | d = getmdev(); | |
94 | if(u.u_error) | |
95 | return; | |
96 | u.u_dirp = u.u_arg[1]; | |
97 | ip = namei(&uchar, 0); | |
98 | if(ip == NULL) | |
99 | return; | |
100 | if(ip->i_count!=1 || (ip->i_mode&(IFBLK&IFCHR))!=0) | |
101 | goto out; | |
102 | smp = NULL; | |
103 | for(mp = &mount[0]; mp < &mount[NMOUNT]; mp++) { | |
104 | if(mp->m_bufp != NULL) { | |
105 | if(d == mp->m_dev) | |
106 | goto out; | |
107 | } else | |
108 | if(smp == NULL) | |
109 | smp = mp; | |
110 | } | |
111 | if(smp == NULL) | |
112 | goto out; | |
113 | (*bdevsw[d.d_major].d_open)(d, !u.u_arg[2]); | |
114 | if(u.u_error) | |
115 | goto out; | |
116 | mp = bread(d, 1); | |
117 | if(u.u_error) { | |
118 | brelse(mp); | |
119 | goto out1; | |
120 | } | |
121 | smp->m_inodp = ip; | |
122 | smp->m_dev = d; | |
123 | smp->m_bufp = getblk(NODEV); | |
124 | bcopy(mp->b_addr, smp->m_bufp->b_addr, 256); | |
125 | smp = smp->m_bufp->b_addr; | |
126 | smp->s_ilock = 0; | |
127 | smp->s_flock = 0; | |
128 | smp->s_ronly = u.u_arg[2] & 1; | |
129 | brelse(mp); | |
130 | ip->i_flag =| IMOUNT; | |
131 | prele(ip); | |
132 | return; | |
133 | ||
134 | out: | |
135 | u.u_error = EBUSY; | |
136 | out1: | |
137 | iput(ip); | |
138 | } | |
139 | ||
140 | /* | |
141 | * the umount system call. | |
142 | */ | |
143 | sumount() | |
144 | { | |
145 | int d; | |
146 | register struct inode *ip; | |
147 | register struct mount *mp; | |
148 | ||
149 | update(); | |
150 | d = getmdev(); | |
151 | if(u.u_error) | |
152 | return; | |
153 | for(mp = &mount[0]; mp < &mount[NMOUNT]; mp++) | |
154 | if(mp->m_bufp!=NULL && d==mp->m_dev) | |
155 | goto found; | |
156 | u.u_error = EINVAL; | |
157 | return; | |
158 | ||
159 | found: | |
160 | for(ip = &inode[0]; ip < &inode[NINODE]; ip++) | |
161 | if(ip->i_number!=0 && d==ip->i_dev) { | |
162 | u.u_error = EBUSY; | |
163 | return; | |
164 | } | |
165 | (*bdevsw[d.d_major].d_close)(d, 0); | |
166 | ip = mp->m_inodp; | |
167 | ip->i_flag =& ~IMOUNT; | |
168 | iput(ip); | |
169 | ip = mp->m_bufp; | |
170 | mp->m_bufp = NULL; | |
171 | brelse(ip); | |
172 | } | |
173 | ||
174 | /* | |
175 | * Common code for mount and umount. | |
176 | * Check that the user's argument is a reasonable | |
177 | * thing on which to mount, and return the device number if so. | |
178 | */ | |
179 | getmdev() | |
180 | { | |
181 | register d, *ip; | |
182 | extern uchar; | |
183 | ||
184 | ip = namei(&uchar, 0); | |
185 | if(ip == NULL) | |
186 | return; | |
187 | if((ip->i_mode&IFMT) != IFBLK) | |
188 | u.u_error = ENOTBLK; | |
189 | d = ip->i_addr[0]; | |
190 | if(ip->i_addr[0].d_major >= nblkdev) | |
191 | u.u_error = ENXIO; | |
192 | iput(ip); | |
193 | return(d); | |
194 | } |