Commit | Line | Data |
---|---|---|
f3e6400f | 1 | /* ufs_vnops.c 4.27 82/06/25 */ |
6459ebe0 | 2 | |
d67a03eb BJ |
3 | #include "../h/param.h" |
4 | #include "../h/systm.h" | |
d67a03eb BJ |
5 | #include "../h/dir.h" |
6 | #include "../h/user.h" | |
d67a03eb | 7 | #include "../h/file.h" |
6459ebe0 | 8 | #include "../h/stat.h" |
3e78e260 | 9 | #include "../h/inode.h" |
6459ebe0 | 10 | #include "../h/fs.h" |
3e78e260 | 11 | #include "../h/buf.h" |
3e78e260 | 12 | #include "../h/proc.h" |
0737b714 | 13 | #include "../h/inline.h" |
3e78e260 BJ |
14 | |
15 | chdir() | |
16 | { | |
17 | ||
18 | chdirec(&u.u_cdir); | |
19 | } | |
20 | ||
21 | chroot() | |
22 | { | |
23 | ||
24 | if (suser()) | |
25 | chdirec(&u.u_rdir); | |
26 | } | |
27 | ||
28 | chdirec(ipp) | |
29 | register struct inode **ipp; | |
30 | { | |
31 | register struct inode *ip; | |
32 | struct a { | |
33 | char *fname; | |
34 | }; | |
35 | ||
36 | ip = namei(uchar, 0, 1); | |
37 | if(ip == NULL) | |
38 | return; | |
39 | if((ip->i_mode&IFMT) != IFDIR) { | |
40 | u.u_error = ENOTDIR; | |
41 | goto bad; | |
42 | } | |
43 | if(access(ip, IEXEC)) | |
44 | goto bad; | |
ca91bded | 45 | iunlock(ip); |
8eee8525 KM |
46 | if (*ipp) |
47 | irele(*ipp); | |
3e78e260 BJ |
48 | *ipp = ip; |
49 | return; | |
50 | ||
51 | bad: | |
52 | iput(ip); | |
53 | } | |
54 | ||
55 | /* | |
56 | * Open system call. | |
57 | */ | |
58 | open() | |
59 | { | |
60 | register struct inode *ip; | |
61 | register struct a { | |
62 | char *fname; | |
63 | int rwmode; | |
64 | } *uap; | |
65 | ||
66 | uap = (struct a *)u.u_ap; | |
67 | ip = namei(uchar, 0, 1); | |
68 | if (ip == NULL) | |
69 | return; | |
70 | open1(ip, ++uap->rwmode, 0); | |
71 | } | |
72 | ||
73 | /* | |
74 | * Creat system call. | |
75 | */ | |
76 | creat() | |
77 | { | |
78 | register struct inode *ip; | |
79 | register struct a { | |
80 | char *fname; | |
81 | int fmode; | |
82 | } *uap; | |
83 | ||
84 | uap = (struct a *)u.u_ap; | |
85 | ip = namei(uchar, 1, 1); | |
86 | if (ip == NULL) { | |
87 | if (u.u_error) | |
88 | return; | |
89 | ip = maknode(uap->fmode&07777&(~ISVTX)); | |
90 | if (ip==NULL) | |
91 | return; | |
92 | open1(ip, FWRITE, 2); | |
93 | } else | |
94 | open1(ip, FWRITE, 1); | |
95 | } | |
96 | ||
97 | /* | |
98 | * Common code for open and creat. | |
99 | * Check permissions, allocate an open file structure, | |
100 | * and call the device open routine if any. | |
101 | */ | |
102 | open1(ip, mode, trf) | |
103 | register struct inode *ip; | |
104 | register mode; | |
105 | { | |
106 | register struct file *fp; | |
107 | int i; | |
108 | ||
109 | if (trf != 2) { | |
110 | if (mode&FREAD) | |
111 | (void) access(ip, IREAD); | |
112 | if (mode&FWRITE) { | |
113 | (void) access(ip, IWRITE); | |
114 | if ((ip->i_mode&IFMT) == IFDIR) | |
115 | u.u_error = EISDIR; | |
116 | } | |
117 | } | |
8eee8525 KM |
118 | if (u.u_error) { |
119 | iput(ip); | |
120 | return; | |
121 | } | |
3e78e260 BJ |
122 | if (trf == 1) |
123 | itrunc(ip); | |
ca91bded | 124 | iunlock(ip); |
3e78e260 BJ |
125 | if ((fp = falloc()) == NULL) |
126 | goto out; | |
127 | fp->f_flag = mode&(FREAD|FWRITE); | |
128 | i = u.u_r.r_val1; | |
129 | fp->f_inode = ip; | |
130 | openi(ip, mode&(FREAD|FWRITE)); | |
131 | if (u.u_error == 0) | |
132 | return; | |
133 | u.u_ofile[i] = NULL; | |
134 | fp->f_count--; | |
135 | out: | |
8eee8525 | 136 | irele(ip); |
3e78e260 BJ |
137 | } |
138 | ||
139 | /* | |
140 | * Mknod system call | |
141 | */ | |
142 | mknod() | |
143 | { | |
144 | register struct inode *ip; | |
145 | register struct a { | |
146 | char *fname; | |
147 | int fmode; | |
148 | int dev; | |
149 | } *uap; | |
150 | ||
151 | uap = (struct a *)u.u_ap; | |
152 | if (suser()) { | |
153 | ip = namei(uchar, 1, 0); | |
154 | if (ip != NULL) { | |
155 | u.u_error = EEXIST; | |
156 | goto out; | |
157 | } | |
158 | } | |
159 | if (u.u_error) | |
160 | return; | |
161 | ip = maknode(uap->fmode); | |
162 | if (ip == NULL) | |
163 | return; | |
164 | if (uap->dev) { | |
165 | /* | |
166 | * Want to be able to use this to make badblock | |
167 | * inodes, so don't truncate the dev number. | |
168 | */ | |
6459ebe0 | 169 | ip->i_rdev = uap->dev; |
3e78e260 BJ |
170 | ip->i_flag |= IACC|IUPD|ICHG; |
171 | } | |
172 | ||
173 | out: | |
174 | iput(ip); | |
175 | } | |
176 | ||
177 | /* | |
178 | * link system call | |
179 | */ | |
180 | link() | |
181 | { | |
182 | register struct inode *ip, *xp; | |
183 | register struct a { | |
184 | char *target; | |
185 | char *linkname; | |
186 | } *uap; | |
187 | ||
188 | uap = (struct a *)u.u_ap; | |
189 | ip = namei(uchar, 0, 1); /* well, this routine is doomed anyhow */ | |
190 | if (ip == NULL) | |
191 | return; | |
192 | if ((ip->i_mode&IFMT)==IFDIR && !suser()) | |
193 | goto out1; | |
194 | ip->i_nlink++; | |
195 | ip->i_flag |= ICHG; | |
196 | iupdat(ip, &time, &time, 1); | |
ca91bded | 197 | iunlock(ip); |
3e78e260 BJ |
198 | u.u_dirp = (caddr_t)uap->linkname; |
199 | xp = namei(uchar, 1, 0); | |
200 | if (xp != NULL) { | |
201 | u.u_error = EEXIST; | |
202 | iput(xp); | |
203 | goto out; | |
204 | } | |
205 | if (u.u_error) | |
206 | goto out; | |
207 | if (u.u_pdir->i_dev != ip->i_dev) { | |
208 | iput(u.u_pdir); | |
209 | u.u_error = EXDEV; | |
210 | goto out; | |
211 | } | |
212 | wdir(ip); | |
213 | out: | |
214 | if (u.u_error) { | |
215 | ip->i_nlink--; | |
216 | ip->i_flag |= ICHG; | |
217 | } | |
218 | out1: | |
8eee8525 | 219 | irele(ip); |
3e78e260 BJ |
220 | } |
221 | ||
222 | /* | |
223 | * symlink -- make a symbolic link | |
224 | */ | |
225 | symlink() | |
226 | { | |
227 | register struct a { | |
228 | char *target; | |
229 | char *linkname; | |
230 | } *uap; | |
231 | register struct inode *ip; | |
232 | register char *tp; | |
233 | register c, nc; | |
234 | ||
235 | uap = (struct a *)u.u_ap; | |
236 | tp = uap->target; | |
237 | nc = 0; | |
238 | while (c = fubyte(tp)) { | |
239 | if (c < 0) { | |
240 | u.u_error = EFAULT; | |
241 | return; | |
242 | } | |
243 | tp++; | |
244 | nc++; | |
245 | } | |
246 | u.u_dirp = uap->linkname; | |
247 | ip = namei(uchar, 1, 0); | |
248 | if (ip) { | |
249 | iput(ip); | |
250 | u.u_error = EEXIST; | |
251 | return; | |
252 | } | |
253 | if (u.u_error) | |
254 | return; | |
255 | ip = maknode(IFLNK | 0777); | |
256 | if (ip == NULL) | |
257 | return; | |
258 | u.u_base = uap->target; | |
259 | u.u_count = nc; | |
260 | u.u_offset = 0; | |
261 | u.u_segflg = 0; | |
262 | writei(ip); | |
263 | iput(ip); | |
264 | } | |
265 | ||
266 | /* | |
267 | * Unlink system call. | |
268 | * Hard to avoid races here, especially | |
269 | * in unlinking directories. | |
270 | */ | |
271 | unlink() | |
272 | { | |
273 | register struct inode *ip, *pp; | |
274 | struct a { | |
275 | char *fname; | |
276 | }; | |
6459ebe0 KM |
277 | struct fs *fs; |
278 | struct buf *bp; | |
279 | int lbn, bn, base; | |
8eee8525 | 280 | int unlinkingdot = 0; |
3e78e260 BJ |
281 | |
282 | pp = namei(uchar, 2, 0); | |
283 | if(pp == NULL) | |
284 | return; | |
285 | /* | |
286 | * Check for unlink(".") | |
287 | * to avoid hanging on the iget | |
288 | */ | |
289 | if (pp->i_number == u.u_dent.d_ino) { | |
290 | ip = pp; | |
291 | ip->i_count++; | |
8eee8525 | 292 | unlinkingdot++; |
3e78e260 | 293 | } else |
6459ebe0 | 294 | ip = iget(pp->i_dev, pp->i_fs, u.u_dent.d_ino); |
3e78e260 BJ |
295 | if(ip == NULL) |
296 | goto out1; | |
297 | if((ip->i_mode&IFMT)==IFDIR && !suser()) | |
298 | goto out; | |
299 | /* | |
300 | * Don't unlink a mounted file. | |
301 | */ | |
302 | if (ip->i_dev != pp->i_dev) { | |
303 | u.u_error = EBUSY; | |
304 | goto out; | |
305 | } | |
306 | if (ip->i_flag&ITEXT) | |
307 | xrele(ip); /* try once to free text */ | |
308 | /* | |
309 | if ((ip->i_flag&ITEXT) && ip->i_nlink==1) { | |
310 | u.u_error = ETXTBSY; | |
311 | goto out; | |
312 | } | |
313 | */ | |
6459ebe0 KM |
314 | if (u.u_count == 0) { |
315 | /* | |
316 | * first entry in block, so set d_ino to zero. | |
317 | */ | |
318 | u.u_base = (caddr_t)&u.u_dent; | |
319 | u.u_count = DIRSIZ(&u.u_dent); | |
320 | u.u_dent.d_ino = 0; | |
321 | writei(pp); | |
322 | } else { | |
323 | /* | |
324 | * updating preceeding entry to skip over current entry. | |
325 | */ | |
326 | fs = pp->i_fs; | |
327 | lbn = lblkno(fs, u.u_offset); | |
328 | base = blkoff(fs, u.u_offset); | |
329 | bn = fsbtodb(fs, bmap(pp, lbn, B_WRITE, base + u.u_count)); | |
330 | bp = bread(pp->i_dev, bn, blksize(fs, pp, lbn)); | |
331 | if (bp->b_flags & B_ERROR) { | |
332 | brelse(bp); | |
333 | goto out; | |
334 | } | |
335 | ((struct direct *)(bp->b_un.b_addr + base))->d_reclen += | |
336 | u.u_dent.d_reclen; | |
337 | bwrite(bp); | |
338 | pp->i_flag |= IUPD|ICHG; | |
339 | } | |
3e78e260 BJ |
340 | ip->i_nlink--; |
341 | ip->i_flag |= ICHG; | |
342 | ||
343 | out: | |
8eee8525 KM |
344 | if (unlinkingdot) |
345 | irele(ip); | |
346 | else | |
347 | iput(ip); | |
3e78e260 BJ |
348 | out1: |
349 | iput(pp); | |
350 | } | |
351 | ||
352 | /* | |
353 | * Seek system call | |
354 | */ | |
355 | seek() | |
356 | { | |
357 | register struct file *fp; | |
358 | register struct a { | |
359 | int fdes; | |
360 | off_t off; | |
361 | int sbase; | |
362 | } *uap; | |
363 | ||
364 | uap = (struct a *)u.u_ap; | |
365 | fp = getf(uap->fdes); | |
366 | if (fp == NULL) | |
367 | return; | |
368 | if (fp->f_flag&FSOCKET) { | |
369 | u.u_error = ESPIPE; | |
370 | return; | |
371 | } | |
372 | if (uap->sbase == 1) | |
373 | uap->off += fp->f_offset; | |
374 | else if (uap->sbase == 2) | |
375 | uap->off += fp->f_inode->i_size; | |
376 | fp->f_offset = uap->off; | |
377 | u.u_r.r_off = uap->off; | |
378 | } | |
379 | ||
380 | /* | |
381 | * Access system call | |
382 | */ | |
383 | saccess() | |
384 | { | |
385 | register svuid, svgid; | |
386 | register struct inode *ip; | |
387 | register struct a { | |
388 | char *fname; | |
389 | int fmode; | |
390 | } *uap; | |
391 | ||
392 | uap = (struct a *)u.u_ap; | |
393 | svuid = u.u_uid; | |
394 | svgid = u.u_gid; | |
395 | u.u_uid = u.u_ruid; | |
396 | u.u_gid = u.u_rgid; | |
397 | ip = namei(uchar, 0, 1); | |
398 | if (ip != NULL) { | |
399 | if (uap->fmode&(IREAD>>6)) | |
400 | (void) access(ip, IREAD); | |
401 | if (uap->fmode&(IWRITE>>6)) | |
402 | (void) access(ip, IWRITE); | |
403 | if (uap->fmode&(IEXEC>>6)) | |
404 | (void) access(ip, IEXEC); | |
405 | iput(ip); | |
406 | } | |
407 | u.u_uid = svuid; | |
408 | u.u_gid = svgid; | |
409 | } | |
d67a03eb BJ |
410 | |
411 | /* | |
412 | * the fstat system call. | |
413 | */ | |
414 | fstat() | |
415 | { | |
416 | register struct file *fp; | |
417 | register struct a { | |
418 | int fdes; | |
419 | struct stat *sb; | |
420 | } *uap; | |
421 | ||
422 | uap = (struct a *)u.u_ap; | |
423 | fp = getf(uap->fdes); | |
e92a04af | 424 | if (fp == NULL) |
d67a03eb | 425 | return; |
e92a04af | 426 | if (fp->f_flag & FSOCKET) |
cc15ab5d | 427 | u.u_error = sostat(fp->f_socket, uap->sb); |
e92a04af BJ |
428 | else |
429 | stat1(fp->f_inode, uap->sb); | |
d67a03eb BJ |
430 | } |
431 | ||
432 | /* | |
6459ebe0 | 433 | * Stat system call. This version follows links. |
d67a03eb BJ |
434 | */ |
435 | stat() | |
436 | { | |
437 | register struct inode *ip; | |
438 | register struct a { | |
439 | char *fname; | |
440 | struct stat *sb; | |
441 | } *uap; | |
442 | ||
443 | uap = (struct a *)u.u_ap; | |
66d4ba1b | 444 | ip = namei(uchar, 0, 1); |
e92a04af | 445 | if (ip == NULL) |
d67a03eb | 446 | return; |
a3aa7f92 | 447 | stat1(ip, uap->sb); |
d67a03eb BJ |
448 | iput(ip); |
449 | } | |
450 | ||
5485e062 | 451 | /* |
6459ebe0 | 452 | * Lstat system call. This version does not follow links. |
5485e062 BJ |
453 | */ |
454 | lstat() | |
455 | { | |
456 | register struct inode *ip; | |
457 | register struct a { | |
458 | char *fname; | |
459 | struct stat *sb; | |
460 | } *uap; | |
461 | ||
462 | uap = (struct a *)u.u_ap; | |
66d4ba1b | 463 | ip = namei(uchar, 0, 0); |
5485e062 BJ |
464 | if (ip == NULL) |
465 | return; | |
019b08c9 | 466 | stat1(ip, uap->sb); |
5485e062 BJ |
467 | iput(ip); |
468 | } | |
469 | ||
d67a03eb BJ |
470 | /* |
471 | * The basic routine for fstat and stat: | |
472 | * get the inode and pass appropriate parts back. | |
473 | */ | |
a3aa7f92 | 474 | stat1(ip, ub) |
e92a04af BJ |
475 | register struct inode *ip; |
476 | struct stat *ub; | |
d67a03eb | 477 | { |
d67a03eb BJ |
478 | struct stat ds; |
479 | ||
c0bb1685 | 480 | IUPDAT(ip, &time, &time, 0); |
d67a03eb | 481 | /* |
09c42945 | 482 | * Copy from inode table |
d67a03eb BJ |
483 | */ |
484 | ds.st_dev = ip->i_dev; | |
485 | ds.st_ino = ip->i_number; | |
486 | ds.st_mode = ip->i_mode; | |
487 | ds.st_nlink = ip->i_nlink; | |
488 | ds.st_uid = ip->i_uid; | |
489 | ds.st_gid = ip->i_gid; | |
6459ebe0 | 490 | ds.st_rdev = (dev_t)ip->i_rdev; |
a3aa7f92 | 491 | ds.st_size = ip->i_size; |
6459ebe0 KM |
492 | ds.st_atime = ip->i_atime; |
493 | ds.st_mtime = ip->i_mtime; | |
494 | ds.st_ctime = ip->i_ctime; | |
09c42945 | 495 | ds.st_blksize = ip->i_fs->fs_bsize; |
d67a03eb BJ |
496 | if (copyout((caddr_t)&ds, (caddr_t)ub, sizeof(ds)) < 0) |
497 | u.u_error = EFAULT; | |
498 | } | |
499 | ||
500 | /* | |
5485e062 BJ |
501 | * Return target name of a symbolic link |
502 | */ | |
503 | readlink() | |
504 | { | |
505 | register struct inode *ip; | |
506 | register struct a { | |
507 | char *name; | |
508 | char *buf; | |
509 | int count; | |
510 | } *uap; | |
511 | ||
512 | ip = namei(uchar, 0, 0); | |
513 | if (ip == NULL) | |
514 | return; | |
515 | if ((ip->i_mode&IFMT) != IFLNK) { | |
516 | u.u_error = ENXIO; | |
517 | goto out; | |
518 | } | |
519 | uap = (struct a *)u.u_ap; | |
520 | u.u_offset = 0; | |
521 | u.u_base = uap->buf; | |
522 | u.u_count = uap->count; | |
523 | u.u_segflg = 0; | |
524 | readi(ip); | |
525 | out: | |
526 | iput(ip); | |
527 | u.u_r.r_val1 = uap->count - u.u_count; | |
528 | } | |
529 | ||
3e78e260 | 530 | chmod() |
5485e062 | 531 | { |
3e78e260 | 532 | register struct inode *ip; |
5485e062 | 533 | register struct a { |
3e78e260 BJ |
534 | char *fname; |
535 | int fmode; | |
5485e062 | 536 | } *uap; |
5485e062 BJ |
537 | |
538 | uap = (struct a *)u.u_ap; | |
3e78e260 | 539 | if ((ip = owner(1)) == NULL) |
5485e062 | 540 | return; |
3e78e260 BJ |
541 | ip->i_mode &= ~07777; |
542 | if (u.u_uid) | |
543 | uap->fmode &= ~ISVTX; | |
544 | ip->i_mode |= uap->fmode&07777; | |
545 | ip->i_flag |= ICHG; | |
546 | if (ip->i_flag&ITEXT && (ip->i_mode&ISVTX)==0) | |
547 | xrele(ip); | |
5485e062 BJ |
548 | iput(ip); |
549 | } | |
550 | ||
3e78e260 | 551 | chown() |
d67a03eb | 552 | { |
3e78e260 | 553 | register struct inode *ip; |
d67a03eb | 554 | register struct a { |
3e78e260 BJ |
555 | char *fname; |
556 | int uid; | |
557 | int gid; | |
d67a03eb | 558 | } *uap; |
d67a03eb BJ |
559 | |
560 | uap = (struct a *)u.u_ap; | |
3e78e260 | 561 | if (!suser() || (ip = owner(0)) == NULL) |
d67a03eb | 562 | return; |
3e78e260 BJ |
563 | ip->i_uid = uap->uid; |
564 | ip->i_gid = uap->gid; | |
565 | ip->i_flag |= ICHG; | |
566 | if (u.u_ruid != 0) | |
567 | ip->i_mode &= ~(ISUID|ISGID); | |
568 | iput(ip); | |
d67a03eb BJ |
569 | } |
570 | ||
571 | /* | |
3e78e260 BJ |
572 | * Set IUPD and IACC times on file. |
573 | * Can't set ICHG. | |
d67a03eb | 574 | */ |
3e78e260 | 575 | utime() |
e92a04af | 576 | { |
d67a03eb | 577 | register struct a { |
3e78e260 BJ |
578 | char *fname; |
579 | time_t *tptr; | |
d67a03eb | 580 | } *uap; |
3e78e260 BJ |
581 | register struct inode *ip; |
582 | time_t tv[2]; | |
d67a03eb BJ |
583 | |
584 | uap = (struct a *)u.u_ap; | |
3e78e260 | 585 | if ((ip = owner(1)) == NULL) |
d67a03eb | 586 | return; |
3e78e260 BJ |
587 | if (copyin((caddr_t)uap->tptr, (caddr_t)tv, sizeof(tv))) { |
588 | u.u_error = EFAULT; | |
589 | } else { | |
590 | ip->i_flag |= IACC|IUPD|ICHG; | |
591 | iupdat(ip, &tv[0], &tv[1], 0); | |
d67a03eb | 592 | } |
d67a03eb BJ |
593 | iput(ip); |
594 | } | |
595 | ||
3e78e260 | 596 | sync() |
d67a03eb | 597 | { |
d67a03eb | 598 | |
68503f9a | 599 | update(0); |
d67a03eb | 600 | } |