Commit | Line | Data |
---|---|---|
66d4ba1b | 1 | /* ufs_vnops.c 4.22 82/04/01 */ |
d67a03eb BJ |
2 | |
3 | #include "../h/param.h" | |
4 | #include "../h/systm.h" | |
d67a03eb BJ |
5 | #include "../h/dir.h" |
6 | #include "../h/user.h" | |
3e78e260 | 7 | #include "../h/reg.h" |
d67a03eb | 8 | #include "../h/file.h" |
3e78e260 BJ |
9 | #include "../h/inode.h" |
10 | #include "../h/ino.h" | |
11 | #include "../h/pte.h" | |
12 | #include "../h/vm.h" | |
13 | #include "../h/buf.h" | |
14 | #include "../h/mtpr.h" | |
15 | #include "../h/proc.h" | |
0737b714 | 16 | #include "../h/inline.h" |
3e78e260 | 17 | #include "../h/conf.h" |
ae921915 BJ |
18 | #include "../h/socket.h" |
19 | #include "../h/socketvar.h" | |
3e78e260 BJ |
20 | #include "../h/stat.h" |
21 | ||
22 | chdir() | |
23 | { | |
24 | ||
25 | chdirec(&u.u_cdir); | |
26 | } | |
27 | ||
28 | chroot() | |
29 | { | |
30 | ||
31 | if (suser()) | |
32 | chdirec(&u.u_rdir); | |
33 | } | |
34 | ||
35 | chdirec(ipp) | |
36 | register struct inode **ipp; | |
37 | { | |
38 | register struct inode *ip; | |
39 | struct a { | |
40 | char *fname; | |
41 | }; | |
42 | ||
43 | ip = namei(uchar, 0, 1); | |
44 | if(ip == NULL) | |
45 | return; | |
46 | if((ip->i_mode&IFMT) != IFDIR) { | |
47 | u.u_error = ENOTDIR; | |
48 | goto bad; | |
49 | } | |
50 | if(access(ip, IEXEC)) | |
51 | goto bad; | |
52 | irele(ip); | |
53 | if (*ipp) { | |
54 | ilock(*ipp); | |
55 | iput(*ipp); | |
56 | } | |
57 | *ipp = ip; | |
58 | return; | |
59 | ||
60 | bad: | |
61 | iput(ip); | |
62 | } | |
63 | ||
64 | /* | |
65 | * Open system call. | |
66 | */ | |
67 | open() | |
68 | { | |
69 | register struct inode *ip; | |
70 | register struct a { | |
71 | char *fname; | |
72 | int rwmode; | |
73 | } *uap; | |
74 | ||
75 | uap = (struct a *)u.u_ap; | |
76 | ip = namei(uchar, 0, 1); | |
77 | if (ip == NULL) | |
78 | return; | |
79 | open1(ip, ++uap->rwmode, 0); | |
80 | } | |
81 | ||
82 | /* | |
83 | * Creat system call. | |
84 | */ | |
85 | creat() | |
86 | { | |
87 | register struct inode *ip; | |
88 | register struct a { | |
89 | char *fname; | |
90 | int fmode; | |
91 | } *uap; | |
92 | ||
93 | uap = (struct a *)u.u_ap; | |
94 | ip = namei(uchar, 1, 1); | |
95 | if (ip == NULL) { | |
96 | if (u.u_error) | |
97 | return; | |
98 | ip = maknode(uap->fmode&07777&(~ISVTX)); | |
99 | if (ip==NULL) | |
100 | return; | |
101 | open1(ip, FWRITE, 2); | |
102 | } else | |
103 | open1(ip, FWRITE, 1); | |
104 | } | |
105 | ||
106 | /* | |
107 | * Common code for open and creat. | |
108 | * Check permissions, allocate an open file structure, | |
109 | * and call the device open routine if any. | |
110 | */ | |
111 | open1(ip, mode, trf) | |
112 | register struct inode *ip; | |
113 | register mode; | |
114 | { | |
115 | register struct file *fp; | |
116 | int i; | |
117 | ||
118 | if (trf != 2) { | |
119 | if (mode&FREAD) | |
120 | (void) access(ip, IREAD); | |
121 | if (mode&FWRITE) { | |
122 | (void) access(ip, IWRITE); | |
123 | if ((ip->i_mode&IFMT) == IFDIR) | |
124 | u.u_error = EISDIR; | |
125 | } | |
126 | } | |
127 | if (u.u_error) | |
128 | goto out; | |
129 | if (trf == 1) | |
130 | itrunc(ip); | |
131 | irele(ip); | |
132 | if ((fp = falloc()) == NULL) | |
133 | goto out; | |
134 | fp->f_flag = mode&(FREAD|FWRITE); | |
135 | i = u.u_r.r_val1; | |
136 | fp->f_inode = ip; | |
137 | openi(ip, mode&(FREAD|FWRITE)); | |
138 | if (u.u_error == 0) | |
139 | return; | |
140 | u.u_ofile[i] = NULL; | |
141 | fp->f_count--; | |
142 | out: | |
143 | if (ip != NULL) | |
144 | iput(ip); | |
145 | } | |
146 | ||
147 | /* | |
148 | * Mknod system call | |
149 | */ | |
150 | mknod() | |
151 | { | |
152 | register struct inode *ip; | |
153 | register struct a { | |
154 | char *fname; | |
155 | int fmode; | |
156 | int dev; | |
157 | } *uap; | |
158 | ||
159 | uap = (struct a *)u.u_ap; | |
160 | if (suser()) { | |
161 | ip = namei(uchar, 1, 0); | |
162 | if (ip != NULL) { | |
163 | u.u_error = EEXIST; | |
164 | goto out; | |
165 | } | |
166 | } | |
167 | if (u.u_error) | |
168 | return; | |
169 | ip = maknode(uap->fmode); | |
170 | if (ip == NULL) | |
171 | return; | |
172 | if (uap->dev) { | |
173 | /* | |
174 | * Want to be able to use this to make badblock | |
175 | * inodes, so don't truncate the dev number. | |
176 | */ | |
177 | ip->i_un.i_rdev = uap->dev; | |
178 | ip->i_flag |= IACC|IUPD|ICHG; | |
179 | } | |
180 | ||
181 | out: | |
182 | iput(ip); | |
183 | } | |
184 | ||
185 | /* | |
186 | * link system call | |
187 | */ | |
188 | link() | |
189 | { | |
190 | register struct inode *ip, *xp; | |
191 | register struct a { | |
192 | char *target; | |
193 | char *linkname; | |
194 | } *uap; | |
195 | ||
196 | uap = (struct a *)u.u_ap; | |
197 | ip = namei(uchar, 0, 1); /* well, this routine is doomed anyhow */ | |
198 | if (ip == NULL) | |
199 | return; | |
200 | if ((ip->i_mode&IFMT)==IFDIR && !suser()) | |
201 | goto out1; | |
202 | ip->i_nlink++; | |
203 | ip->i_flag |= ICHG; | |
204 | iupdat(ip, &time, &time, 1); | |
205 | irele(ip); | |
206 | u.u_dirp = (caddr_t)uap->linkname; | |
207 | xp = namei(uchar, 1, 0); | |
208 | if (xp != NULL) { | |
209 | u.u_error = EEXIST; | |
210 | iput(xp); | |
211 | goto out; | |
212 | } | |
213 | if (u.u_error) | |
214 | goto out; | |
215 | if (u.u_pdir->i_dev != ip->i_dev) { | |
216 | iput(u.u_pdir); | |
217 | u.u_error = EXDEV; | |
218 | goto out; | |
219 | } | |
220 | wdir(ip); | |
221 | out: | |
222 | if (u.u_error) { | |
223 | ip->i_nlink--; | |
224 | ip->i_flag |= ICHG; | |
225 | } | |
226 | out1: | |
227 | iput(ip); | |
228 | } | |
229 | ||
230 | /* | |
231 | * symlink -- make a symbolic link | |
232 | */ | |
233 | symlink() | |
234 | { | |
235 | register struct a { | |
236 | char *target; | |
237 | char *linkname; | |
238 | } *uap; | |
239 | register struct inode *ip; | |
240 | register char *tp; | |
241 | register c, nc; | |
242 | ||
243 | uap = (struct a *)u.u_ap; | |
244 | tp = uap->target; | |
245 | nc = 0; | |
246 | while (c = fubyte(tp)) { | |
247 | if (c < 0) { | |
248 | u.u_error = EFAULT; | |
249 | return; | |
250 | } | |
251 | tp++; | |
252 | nc++; | |
253 | } | |
254 | u.u_dirp = uap->linkname; | |
255 | ip = namei(uchar, 1, 0); | |
256 | if (ip) { | |
257 | iput(ip); | |
258 | u.u_error = EEXIST; | |
259 | return; | |
260 | } | |
261 | if (u.u_error) | |
262 | return; | |
263 | ip = maknode(IFLNK | 0777); | |
264 | if (ip == NULL) | |
265 | return; | |
266 | u.u_base = uap->target; | |
267 | u.u_count = nc; | |
268 | u.u_offset = 0; | |
269 | u.u_segflg = 0; | |
270 | writei(ip); | |
271 | iput(ip); | |
272 | } | |
273 | ||
274 | /* | |
275 | * Unlink system call. | |
276 | * Hard to avoid races here, especially | |
277 | * in unlinking directories. | |
278 | */ | |
279 | unlink() | |
280 | { | |
281 | register struct inode *ip, *pp; | |
282 | struct a { | |
283 | char *fname; | |
284 | }; | |
285 | ||
286 | pp = namei(uchar, 2, 0); | |
287 | if(pp == NULL) | |
288 | return; | |
289 | /* | |
290 | * Check for unlink(".") | |
291 | * to avoid hanging on the iget | |
292 | */ | |
293 | if (pp->i_number == u.u_dent.d_ino) { | |
294 | ip = pp; | |
295 | ip->i_count++; | |
296 | } else | |
297 | ip = iget(pp->i_dev, u.u_dent.d_ino); | |
298 | if(ip == NULL) | |
299 | goto out1; | |
300 | if((ip->i_mode&IFMT)==IFDIR && !suser()) | |
301 | goto out; | |
302 | /* | |
303 | * Don't unlink a mounted file. | |
304 | */ | |
305 | if (ip->i_dev != pp->i_dev) { | |
306 | u.u_error = EBUSY; | |
307 | goto out; | |
308 | } | |
309 | if (ip->i_flag&ITEXT) | |
310 | xrele(ip); /* try once to free text */ | |
311 | /* | |
312 | if ((ip->i_flag&ITEXT) && ip->i_nlink==1) { | |
313 | u.u_error = ETXTBSY; | |
314 | goto out; | |
315 | } | |
316 | */ | |
317 | u.u_offset -= sizeof(struct direct); | |
318 | u.u_base = (caddr_t)&u.u_dent; | |
319 | u.u_count = sizeof(struct direct); | |
320 | u.u_dent.d_ino = 0; | |
321 | writei(pp); | |
322 | ip->i_nlink--; | |
323 | ip->i_flag |= ICHG; | |
324 | ||
325 | out: | |
326 | iput(ip); | |
327 | out1: | |
328 | iput(pp); | |
329 | } | |
330 | ||
331 | /* | |
332 | * Seek system call | |
333 | */ | |
334 | seek() | |
335 | { | |
336 | register struct file *fp; | |
337 | register struct a { | |
338 | int fdes; | |
339 | off_t off; | |
340 | int sbase; | |
341 | } *uap; | |
342 | ||
343 | uap = (struct a *)u.u_ap; | |
344 | fp = getf(uap->fdes); | |
345 | if (fp == NULL) | |
346 | return; | |
347 | if (fp->f_flag&FSOCKET) { | |
348 | u.u_error = ESPIPE; | |
349 | return; | |
350 | } | |
351 | if (uap->sbase == 1) | |
352 | uap->off += fp->f_offset; | |
353 | else if (uap->sbase == 2) | |
354 | uap->off += fp->f_inode->i_size; | |
355 | fp->f_offset = uap->off; | |
356 | u.u_r.r_off = uap->off; | |
357 | } | |
358 | ||
359 | /* | |
360 | * Access system call | |
361 | */ | |
362 | saccess() | |
363 | { | |
364 | register svuid, svgid; | |
365 | register struct inode *ip; | |
366 | register struct a { | |
367 | char *fname; | |
368 | int fmode; | |
369 | } *uap; | |
370 | ||
371 | uap = (struct a *)u.u_ap; | |
372 | svuid = u.u_uid; | |
373 | svgid = u.u_gid; | |
374 | u.u_uid = u.u_ruid; | |
375 | u.u_gid = u.u_rgid; | |
376 | ip = namei(uchar, 0, 1); | |
377 | if (ip != NULL) { | |
378 | if (uap->fmode&(IREAD>>6)) | |
379 | (void) access(ip, IREAD); | |
380 | if (uap->fmode&(IWRITE>>6)) | |
381 | (void) access(ip, IWRITE); | |
382 | if (uap->fmode&(IEXEC>>6)) | |
383 | (void) access(ip, IEXEC); | |
384 | iput(ip); | |
385 | } | |
386 | u.u_uid = svuid; | |
387 | u.u_gid = svgid; | |
388 | } | |
d67a03eb BJ |
389 | |
390 | /* | |
391 | * the fstat system call. | |
392 | */ | |
393 | fstat() | |
394 | { | |
395 | register struct file *fp; | |
396 | register struct a { | |
397 | int fdes; | |
398 | struct stat *sb; | |
399 | } *uap; | |
400 | ||
401 | uap = (struct a *)u.u_ap; | |
402 | fp = getf(uap->fdes); | |
e92a04af | 403 | if (fp == NULL) |
d67a03eb | 404 | return; |
e92a04af | 405 | if (fp->f_flag & FSOCKET) |
cc15ab5d | 406 | u.u_error = sostat(fp->f_socket, uap->sb); |
e92a04af BJ |
407 | else |
408 | stat1(fp->f_inode, uap->sb); | |
d67a03eb BJ |
409 | } |
410 | ||
411 | /* | |
66d4ba1b | 412 | * Stat system call; this follows links. |
d67a03eb BJ |
413 | */ |
414 | stat() | |
415 | { | |
416 | register struct inode *ip; | |
417 | register struct a { | |
418 | char *fname; | |
419 | struct stat *sb; | |
420 | } *uap; | |
421 | ||
422 | uap = (struct a *)u.u_ap; | |
66d4ba1b | 423 | ip = namei(uchar, 0, 1); |
e92a04af | 424 | if (ip == NULL) |
d67a03eb | 425 | return; |
a3aa7f92 | 426 | stat1(ip, uap->sb); |
d67a03eb BJ |
427 | iput(ip); |
428 | } | |
429 | ||
5485e062 | 430 | /* |
66d4ba1b | 431 | * Lstat system call; like stat but doesn't follow links. |
5485e062 BJ |
432 | */ |
433 | lstat() | |
434 | { | |
435 | register struct inode *ip; | |
436 | register struct a { | |
437 | char *fname; | |
438 | struct stat *sb; | |
439 | } *uap; | |
440 | ||
441 | uap = (struct a *)u.u_ap; | |
66d4ba1b | 442 | ip = namei(uchar, 0, 0); |
5485e062 BJ |
443 | if (ip == NULL) |
444 | return; | |
019b08c9 | 445 | stat1(ip, uap->sb); |
5485e062 BJ |
446 | iput(ip); |
447 | } | |
448 | ||
d67a03eb BJ |
449 | /* |
450 | * The basic routine for fstat and stat: | |
451 | * get the inode and pass appropriate parts back. | |
452 | */ | |
a3aa7f92 | 453 | stat1(ip, ub) |
e92a04af BJ |
454 | register struct inode *ip; |
455 | struct stat *ub; | |
d67a03eb BJ |
456 | { |
457 | register struct dinode *dp; | |
458 | register struct buf *bp; | |
459 | struct stat ds; | |
460 | ||
c0bb1685 | 461 | IUPDAT(ip, &time, &time, 0); |
d67a03eb | 462 | /* |
e92a04af | 463 | * First copy from inode table |
d67a03eb BJ |
464 | */ |
465 | ds.st_dev = ip->i_dev; | |
466 | ds.st_ino = ip->i_number; | |
467 | ds.st_mode = ip->i_mode; | |
468 | ds.st_nlink = ip->i_nlink; | |
469 | ds.st_uid = ip->i_uid; | |
470 | ds.st_gid = ip->i_gid; | |
471 | ds.st_rdev = (dev_t)ip->i_un.i_rdev; | |
a3aa7f92 | 472 | ds.st_size = ip->i_size; |
d67a03eb | 473 | /* |
5485e062 | 474 | * next the dates in the disk |
d67a03eb BJ |
475 | */ |
476 | bp = bread(ip->i_dev, itod(ip->i_number)); | |
477 | dp = bp->b_un.b_dino; | |
478 | dp += itoo(ip->i_number); | |
479 | ds.st_atime = dp->di_atime; | |
480 | ds.st_mtime = dp->di_mtime; | |
481 | ds.st_ctime = dp->di_ctime; | |
482 | brelse(bp); | |
483 | if (copyout((caddr_t)&ds, (caddr_t)ub, sizeof(ds)) < 0) | |
484 | u.u_error = EFAULT; | |
485 | } | |
486 | ||
487 | /* | |
5485e062 BJ |
488 | * Return target name of a symbolic link |
489 | */ | |
490 | readlink() | |
491 | { | |
492 | register struct inode *ip; | |
493 | register struct a { | |
494 | char *name; | |
495 | char *buf; | |
496 | int count; | |
497 | } *uap; | |
498 | ||
499 | ip = namei(uchar, 0, 0); | |
500 | if (ip == NULL) | |
501 | return; | |
502 | if ((ip->i_mode&IFMT) != IFLNK) { | |
503 | u.u_error = ENXIO; | |
504 | goto out; | |
505 | } | |
506 | uap = (struct a *)u.u_ap; | |
507 | u.u_offset = 0; | |
508 | u.u_base = uap->buf; | |
509 | u.u_count = uap->count; | |
510 | u.u_segflg = 0; | |
511 | readi(ip); | |
512 | out: | |
513 | iput(ip); | |
514 | u.u_r.r_val1 = uap->count - u.u_count; | |
515 | } | |
516 | ||
3e78e260 | 517 | chmod() |
5485e062 | 518 | { |
3e78e260 | 519 | register struct inode *ip; |
5485e062 | 520 | register struct a { |
3e78e260 BJ |
521 | char *fname; |
522 | int fmode; | |
5485e062 | 523 | } *uap; |
5485e062 BJ |
524 | |
525 | uap = (struct a *)u.u_ap; | |
3e78e260 | 526 | if ((ip = owner(1)) == NULL) |
5485e062 | 527 | return; |
3e78e260 BJ |
528 | ip->i_mode &= ~07777; |
529 | if (u.u_uid) | |
530 | uap->fmode &= ~ISVTX; | |
531 | ip->i_mode |= uap->fmode&07777; | |
532 | ip->i_flag |= ICHG; | |
533 | if (ip->i_flag&ITEXT && (ip->i_mode&ISVTX)==0) | |
534 | xrele(ip); | |
5485e062 BJ |
535 | iput(ip); |
536 | } | |
537 | ||
3e78e260 | 538 | chown() |
d67a03eb | 539 | { |
3e78e260 | 540 | register struct inode *ip; |
d67a03eb | 541 | register struct a { |
3e78e260 BJ |
542 | char *fname; |
543 | int uid; | |
544 | int gid; | |
d67a03eb | 545 | } *uap; |
d67a03eb BJ |
546 | |
547 | uap = (struct a *)u.u_ap; | |
3e78e260 | 548 | if (!suser() || (ip = owner(0)) == NULL) |
d67a03eb | 549 | return; |
3e78e260 BJ |
550 | ip->i_uid = uap->uid; |
551 | ip->i_gid = uap->gid; | |
552 | ip->i_flag |= ICHG; | |
553 | if (u.u_ruid != 0) | |
554 | ip->i_mode &= ~(ISUID|ISGID); | |
555 | iput(ip); | |
d67a03eb BJ |
556 | } |
557 | ||
558 | /* | |
3e78e260 BJ |
559 | * Set IUPD and IACC times on file. |
560 | * Can't set ICHG. | |
d67a03eb | 561 | */ |
3e78e260 | 562 | utime() |
e92a04af | 563 | { |
d67a03eb | 564 | register struct a { |
3e78e260 BJ |
565 | char *fname; |
566 | time_t *tptr; | |
d67a03eb | 567 | } *uap; |
3e78e260 BJ |
568 | register struct inode *ip; |
569 | time_t tv[2]; | |
d67a03eb BJ |
570 | |
571 | uap = (struct a *)u.u_ap; | |
3e78e260 | 572 | if ((ip = owner(1)) == NULL) |
d67a03eb | 573 | return; |
3e78e260 BJ |
574 | if (copyin((caddr_t)uap->tptr, (caddr_t)tv, sizeof(tv))) { |
575 | u.u_error = EFAULT; | |
576 | } else { | |
577 | ip->i_flag |= IACC|IUPD|ICHG; | |
578 | iupdat(ip, &tv[0], &tv[1], 0); | |
d67a03eb | 579 | } |
d67a03eb BJ |
580 | iput(ip); |
581 | } | |
582 | ||
3e78e260 | 583 | sync() |
d67a03eb | 584 | { |
d67a03eb | 585 | |
68503f9a | 586 | update(0); |
d67a03eb | 587 | } |