Commit | Line | Data |
---|---|---|
d67a03eb BJ |
1 | /* ufs_vnops.c 3.1 %H% */ |
2 | ||
3 | #include "../h/param.h" | |
4 | #include "../h/systm.h" | |
5 | #include "../h/mount.h" | |
6 | #include "../h/ino.h" | |
7 | #include "../h/reg.h" | |
8 | #include "../h/buf.h" | |
9 | #include "../h/filsys.h" | |
10 | #include "../h/dir.h" | |
11 | #include "../h/user.h" | |
12 | #include "../h/inode.h" | |
13 | #include "../h/file.h" | |
14 | #include "../h/conf.h" | |
15 | #include "../h/stat.h" | |
16 | ||
17 | /* | |
18 | * the fstat system call. | |
19 | */ | |
20 | fstat() | |
21 | { | |
22 | register struct file *fp; | |
23 | register struct a { | |
24 | int fdes; | |
25 | struct stat *sb; | |
26 | } *uap; | |
27 | ||
28 | uap = (struct a *)u.u_ap; | |
29 | fp = getf(uap->fdes); | |
30 | if(fp == NULL) | |
31 | return; | |
32 | stat1(fp->f_inode, uap->sb, fp->f_flag&FPIPE? fp->f_un.f_offset: 0); | |
33 | } | |
34 | ||
35 | /* | |
36 | * the stat system call. | |
37 | */ | |
38 | stat() | |
39 | { | |
40 | register struct inode *ip; | |
41 | register struct a { | |
42 | char *fname; | |
43 | struct stat *sb; | |
44 | } *uap; | |
45 | ||
46 | uap = (struct a *)u.u_ap; | |
47 | ip = namei(uchar, 0); | |
48 | if(ip == NULL) | |
49 | return; | |
50 | stat1(ip, uap->sb, (off_t)0); | |
51 | iput(ip); | |
52 | } | |
53 | ||
54 | /* | |
55 | * The basic routine for fstat and stat: | |
56 | * get the inode and pass appropriate parts back. | |
57 | */ | |
58 | stat1(ip, ub, pipeadj) | |
59 | register struct inode *ip; | |
60 | struct stat *ub; | |
61 | off_t pipeadj; | |
62 | { | |
63 | register struct dinode *dp; | |
64 | register struct buf *bp; | |
65 | struct stat ds; | |
66 | ||
67 | iupdat(ip, &time, &time); | |
68 | /* | |
69 | * first copy from inode table | |
70 | */ | |
71 | ds.st_dev = ip->i_dev; | |
72 | ds.st_ino = ip->i_number; | |
73 | ds.st_mode = ip->i_mode; | |
74 | ds.st_nlink = ip->i_nlink; | |
75 | ds.st_uid = ip->i_uid; | |
76 | ds.st_gid = ip->i_gid; | |
77 | ds.st_rdev = (dev_t)ip->i_un.i_rdev; | |
78 | ds.st_size = ip->i_size - pipeadj; | |
79 | /* | |
80 | * next the dates in the disk | |
81 | */ | |
82 | bp = bread(ip->i_dev, itod(ip->i_number)); | |
83 | dp = bp->b_un.b_dino; | |
84 | dp += itoo(ip->i_number); | |
85 | ds.st_atime = dp->di_atime; | |
86 | ds.st_mtime = dp->di_mtime; | |
87 | ds.st_ctime = dp->di_ctime; | |
88 | brelse(bp); | |
89 | if (copyout((caddr_t)&ds, (caddr_t)ub, sizeof(ds)) < 0) | |
90 | u.u_error = EFAULT; | |
91 | } | |
92 | ||
93 | /* | |
94 | * the dup system call. | |
95 | */ | |
96 | dup() | |
97 | { | |
98 | register struct file *fp; | |
99 | register struct a { | |
100 | int fdes; | |
101 | int fdes2; | |
102 | } *uap; | |
103 | register i, m; | |
104 | ||
105 | uap = (struct a *)u.u_ap; | |
106 | m = uap->fdes & ~077; | |
107 | uap->fdes &= 077; | |
108 | fp = getf(uap->fdes); | |
109 | if(fp == NULL) | |
110 | return; | |
111 | if ((m&0100) == 0) { | |
112 | if ((i = ufalloc()) < 0) | |
113 | return; | |
114 | } else { | |
115 | i = uap->fdes2; | |
116 | if (i<0 || i>=NOFILE) { | |
117 | u.u_error = EBADF; | |
118 | return; | |
119 | } | |
120 | if (u.u_vrpages[i]) { | |
121 | u.u_error = ETXTBSY; | |
122 | return; | |
123 | } | |
124 | u.u_r.r_val1 = i; | |
125 | } | |
126 | if (i!=uap->fdes) { | |
127 | if (u.u_ofile[i]!=NULL) | |
128 | closef(u.u_ofile[i]); | |
129 | u.u_ofile[i] = fp; | |
130 | fp->f_count++; | |
131 | } | |
132 | } | |
133 | ||
134 | /* | |
135 | * the mount system call. | |
136 | */ | |
137 | smount() | |
138 | { | |
139 | dev_t dev; | |
140 | register struct inode *ip; | |
141 | register struct mount *mp; | |
142 | struct mount *smp; | |
143 | register struct filsys *fp; | |
144 | struct buf *bp; | |
145 | register struct a { | |
146 | char *fspec; | |
147 | char *freg; | |
148 | int ronly; | |
149 | } *uap; | |
150 | ||
151 | uap = (struct a *)u.u_ap; | |
152 | dev = getmdev(); | |
153 | if(u.u_error) | |
154 | return; | |
155 | u.u_dirp = (caddr_t)uap->freg; | |
156 | ip = namei(uchar, 0); | |
157 | if(ip == NULL) | |
158 | return; | |
159 | if(ip->i_count!=1 || (ip->i_mode&(IFBLK&IFCHR))!=0) | |
160 | goto out; | |
161 | smp = NULL; | |
162 | for(mp = &mount[0]; mp < &mount[NMOUNT]; mp++) { | |
163 | if(mp->m_bufp != NULL) { | |
164 | if(dev == mp->m_dev) | |
165 | goto out; | |
166 | } else | |
167 | if(smp == NULL) | |
168 | smp = mp; | |
169 | } | |
170 | mp = smp; | |
171 | if(mp == NULL) | |
172 | goto out; | |
173 | (*bdevsw[major(dev)].d_open)(dev, !uap->ronly); | |
174 | if(u.u_error) | |
175 | goto out; | |
176 | bp = bread(dev, SUPERB); | |
177 | if(u.u_error) { | |
178 | brelse(bp); | |
179 | goto out1; | |
180 | } | |
181 | mp->m_inodp = ip; | |
182 | mp->m_dev = dev; | |
183 | mp->m_bufp = geteblk(); | |
184 | bcopy((caddr_t)bp->b_un.b_addr, mp->m_bufp->b_un.b_addr, BSIZE); | |
185 | fp = mp->m_bufp->b_un.b_filsys; | |
186 | fp->s_ilock = 0; | |
187 | fp->s_flock = 0; | |
188 | fp->s_ronly = uap->ronly & 1; | |
189 | fp->s_nbehind = 0; | |
190 | fp->s_lasti = 1; | |
191 | brelse(bp); | |
192 | ip->i_flag |= IMOUNT; | |
193 | prele(ip); | |
194 | return; | |
195 | ||
196 | out: | |
197 | u.u_error = EBUSY; | |
198 | out1: | |
199 | iput(ip); | |
200 | } | |
201 | ||
202 | /* | |
203 | * the umount system call. | |
204 | */ | |
205 | sumount() | |
206 | { | |
207 | dev_t dev; | |
208 | register struct inode *ip; | |
209 | register struct mount *mp; | |
210 | struct buf *bp; | |
211 | register struct a { | |
212 | char *fspec; | |
213 | }; | |
214 | ||
215 | dev = getmdev(); | |
216 | if(u.u_error) | |
217 | return; | |
218 | xumount(dev); /* remove unused sticky files from text table */ | |
219 | update(); | |
220 | for(mp = &mount[0]; mp < &mount[NMOUNT]; mp++) | |
221 | if(mp->m_bufp != NULL && dev == mp->m_dev) | |
222 | goto found; | |
223 | u.u_error = EINVAL; | |
224 | return; | |
225 | ||
226 | found: | |
227 | for(ip = &inode[0]; ip < &inode[NINODE]; ip++) | |
228 | if(ip->i_number != 0 && dev == ip->i_dev) { | |
229 | u.u_error = EBUSY; | |
230 | return; | |
231 | } | |
232 | (*bdevsw[major(dev)].d_close)(dev, 0); | |
233 | ip = mp->m_inodp; | |
234 | ip->i_flag &= ~IMOUNT; | |
235 | plock(ip); | |
236 | iput(ip); | |
237 | bp = mp->m_bufp; | |
238 | mp->m_bufp = NULL; | |
239 | brelse(bp); | |
240 | } | |
241 | ||
242 | /* | |
243 | * Common code for mount and umount. | |
244 | * Check that the user's argument is a reasonable | |
245 | * thing on which to mount, and return the device number if so. | |
246 | */ | |
247 | dev_t | |
248 | getmdev() | |
249 | { | |
250 | dev_t dev; | |
251 | register struct inode *ip; | |
252 | ||
253 | #ifdef UCB | |
254 | if (!suser()) | |
255 | return(NODEV); | |
256 | #endif | |
257 | ip = namei(uchar, 0); | |
258 | if(ip == NULL) | |
259 | return(NODEV); | |
260 | if((ip->i_mode&IFMT) != IFBLK) | |
261 | u.u_error = ENOTBLK; | |
262 | dev = (dev_t)ip->i_un.i_rdev; | |
263 | if(major(dev) >= nblkdev) | |
264 | u.u_error = ENXIO; | |
265 | iput(ip); | |
266 | return(dev); | |
267 | } |