Commit | Line | Data |
---|---|---|
6459ebe0 | 1 | /* lfs_vnops.c 4.23 82/04/19 */ |
d67a03eb | 2 | |
6459ebe0 KM |
3 | /* merged into kernel: @(#)sys3.c 2.2 4/8/82 */ |
4 | ||
5 | #ifdef SIMFS | |
6 | #include "../h/sysrenam.h" | |
7 | #endif | |
d67a03eb BJ |
8 | #include "../h/param.h" |
9 | #include "../h/systm.h" | |
d67a03eb BJ |
10 | #include "../h/dir.h" |
11 | #include "../h/user.h" | |
d67a03eb | 12 | #include "../h/file.h" |
6459ebe0 | 13 | #include "../h/stat.h" |
3e78e260 | 14 | #include "../h/inode.h" |
6459ebe0 | 15 | #include "../h/fs.h" |
3e78e260 | 16 | #include "../h/buf.h" |
3e78e260 | 17 | #include "../h/proc.h" |
0737b714 | 18 | #include "../h/inline.h" |
3e78e260 BJ |
19 | |
20 | chdir() | |
21 | { | |
22 | ||
23 | chdirec(&u.u_cdir); | |
24 | } | |
25 | ||
26 | chroot() | |
27 | { | |
28 | ||
29 | if (suser()) | |
30 | chdirec(&u.u_rdir); | |
31 | } | |
32 | ||
33 | chdirec(ipp) | |
34 | register struct inode **ipp; | |
35 | { | |
36 | register struct inode *ip; | |
37 | struct a { | |
38 | char *fname; | |
39 | }; | |
40 | ||
41 | ip = namei(uchar, 0, 1); | |
42 | if(ip == NULL) | |
43 | return; | |
44 | if((ip->i_mode&IFMT) != IFDIR) { | |
45 | u.u_error = ENOTDIR; | |
46 | goto bad; | |
47 | } | |
48 | if(access(ip, IEXEC)) | |
49 | goto bad; | |
50 | irele(ip); | |
51 | if (*ipp) { | |
52 | ilock(*ipp); | |
53 | iput(*ipp); | |
54 | } | |
55 | *ipp = ip; | |
56 | return; | |
57 | ||
58 | bad: | |
59 | iput(ip); | |
60 | } | |
61 | ||
62 | /* | |
63 | * Open system call. | |
64 | */ | |
65 | open() | |
66 | { | |
67 | register struct inode *ip; | |
68 | register struct a { | |
69 | char *fname; | |
70 | int rwmode; | |
71 | } *uap; | |
72 | ||
73 | uap = (struct a *)u.u_ap; | |
74 | ip = namei(uchar, 0, 1); | |
75 | if (ip == NULL) | |
76 | return; | |
77 | open1(ip, ++uap->rwmode, 0); | |
78 | } | |
79 | ||
80 | /* | |
81 | * Creat system call. | |
82 | */ | |
83 | creat() | |
84 | { | |
85 | register struct inode *ip; | |
86 | register struct a { | |
87 | char *fname; | |
88 | int fmode; | |
89 | } *uap; | |
90 | ||
91 | uap = (struct a *)u.u_ap; | |
92 | ip = namei(uchar, 1, 1); | |
93 | if (ip == NULL) { | |
94 | if (u.u_error) | |
95 | return; | |
96 | ip = maknode(uap->fmode&07777&(~ISVTX)); | |
97 | if (ip==NULL) | |
98 | return; | |
99 | open1(ip, FWRITE, 2); | |
100 | } else | |
101 | open1(ip, FWRITE, 1); | |
102 | } | |
103 | ||
104 | /* | |
105 | * Common code for open and creat. | |
106 | * Check permissions, allocate an open file structure, | |
107 | * and call the device open routine if any. | |
108 | */ | |
109 | open1(ip, mode, trf) | |
110 | register struct inode *ip; | |
111 | register mode; | |
112 | { | |
113 | register struct file *fp; | |
114 | int i; | |
115 | ||
116 | if (trf != 2) { | |
117 | if (mode&FREAD) | |
118 | (void) access(ip, IREAD); | |
119 | if (mode&FWRITE) { | |
120 | (void) access(ip, IWRITE); | |
121 | if ((ip->i_mode&IFMT) == IFDIR) | |
122 | u.u_error = EISDIR; | |
123 | } | |
124 | } | |
125 | if (u.u_error) | |
126 | goto out; | |
127 | if (trf == 1) | |
128 | itrunc(ip); | |
129 | irele(ip); | |
130 | if ((fp = falloc()) == NULL) | |
131 | goto out; | |
132 | fp->f_flag = mode&(FREAD|FWRITE); | |
133 | i = u.u_r.r_val1; | |
134 | fp->f_inode = ip; | |
135 | openi(ip, mode&(FREAD|FWRITE)); | |
136 | if (u.u_error == 0) | |
137 | return; | |
138 | u.u_ofile[i] = NULL; | |
139 | fp->f_count--; | |
140 | out: | |
141 | if (ip != NULL) | |
142 | iput(ip); | |
143 | } | |
144 | ||
145 | /* | |
146 | * Mknod system call | |
147 | */ | |
148 | mknod() | |
149 | { | |
150 | register struct inode *ip; | |
151 | register struct a { | |
152 | char *fname; | |
153 | int fmode; | |
154 | int dev; | |
155 | } *uap; | |
156 | ||
157 | uap = (struct a *)u.u_ap; | |
158 | if (suser()) { | |
159 | ip = namei(uchar, 1, 0); | |
160 | if (ip != NULL) { | |
161 | u.u_error = EEXIST; | |
162 | goto out; | |
163 | } | |
164 | } | |
165 | if (u.u_error) | |
166 | return; | |
167 | ip = maknode(uap->fmode); | |
168 | if (ip == NULL) | |
169 | return; | |
170 | if (uap->dev) { | |
171 | /* | |
172 | * Want to be able to use this to make badblock | |
173 | * inodes, so don't truncate the dev number. | |
174 | */ | |
6459ebe0 | 175 | ip->i_rdev = uap->dev; |
3e78e260 BJ |
176 | ip->i_flag |= IACC|IUPD|ICHG; |
177 | } | |
178 | ||
179 | out: | |
180 | iput(ip); | |
181 | } | |
182 | ||
183 | /* | |
184 | * link system call | |
185 | */ | |
186 | link() | |
187 | { | |
188 | register struct inode *ip, *xp; | |
189 | register struct a { | |
190 | char *target; | |
191 | char *linkname; | |
192 | } *uap; | |
193 | ||
194 | uap = (struct a *)u.u_ap; | |
195 | ip = namei(uchar, 0, 1); /* well, this routine is doomed anyhow */ | |
196 | if (ip == NULL) | |
197 | return; | |
198 | if ((ip->i_mode&IFMT)==IFDIR && !suser()) | |
199 | goto out1; | |
200 | ip->i_nlink++; | |
201 | ip->i_flag |= ICHG; | |
202 | iupdat(ip, &time, &time, 1); | |
203 | irele(ip); | |
204 | u.u_dirp = (caddr_t)uap->linkname; | |
205 | xp = namei(uchar, 1, 0); | |
206 | if (xp != NULL) { | |
207 | u.u_error = EEXIST; | |
208 | iput(xp); | |
209 | goto out; | |
210 | } | |
211 | if (u.u_error) | |
212 | goto out; | |
213 | if (u.u_pdir->i_dev != ip->i_dev) { | |
214 | iput(u.u_pdir); | |
215 | u.u_error = EXDEV; | |
216 | goto out; | |
217 | } | |
218 | wdir(ip); | |
219 | out: | |
220 | if (u.u_error) { | |
221 | ip->i_nlink--; | |
222 | ip->i_flag |= ICHG; | |
223 | } | |
224 | out1: | |
225 | iput(ip); | |
226 | } | |
227 | ||
228 | /* | |
229 | * symlink -- make a symbolic link | |
230 | */ | |
231 | symlink() | |
232 | { | |
233 | register struct a { | |
234 | char *target; | |
235 | char *linkname; | |
236 | } *uap; | |
237 | register struct inode *ip; | |
238 | register char *tp; | |
239 | register c, nc; | |
240 | ||
241 | uap = (struct a *)u.u_ap; | |
242 | tp = uap->target; | |
243 | nc = 0; | |
244 | while (c = fubyte(tp)) { | |
245 | if (c < 0) { | |
246 | u.u_error = EFAULT; | |
247 | return; | |
248 | } | |
249 | tp++; | |
250 | nc++; | |
251 | } | |
252 | u.u_dirp = uap->linkname; | |
253 | ip = namei(uchar, 1, 0); | |
254 | if (ip) { | |
255 | iput(ip); | |
256 | u.u_error = EEXIST; | |
257 | return; | |
258 | } | |
259 | if (u.u_error) | |
260 | return; | |
261 | ip = maknode(IFLNK | 0777); | |
262 | if (ip == NULL) | |
263 | return; | |
264 | u.u_base = uap->target; | |
265 | u.u_count = nc; | |
266 | u.u_offset = 0; | |
267 | u.u_segflg = 0; | |
268 | writei(ip); | |
269 | iput(ip); | |
270 | } | |
271 | ||
272 | /* | |
273 | * Unlink system call. | |
274 | * Hard to avoid races here, especially | |
275 | * in unlinking directories. | |
276 | */ | |
277 | unlink() | |
278 | { | |
279 | register struct inode *ip, *pp; | |
280 | struct a { | |
281 | char *fname; | |
282 | }; | |
6459ebe0 KM |
283 | struct fs *fs; |
284 | struct buf *bp; | |
285 | int lbn, bn, base; | |
3e78e260 BJ |
286 | |
287 | pp = namei(uchar, 2, 0); | |
288 | if(pp == NULL) | |
289 | return; | |
290 | /* | |
291 | * Check for unlink(".") | |
292 | * to avoid hanging on the iget | |
293 | */ | |
294 | if (pp->i_number == u.u_dent.d_ino) { | |
295 | ip = pp; | |
296 | ip->i_count++; | |
297 | } else | |
6459ebe0 | 298 | ip = iget(pp->i_dev, pp->i_fs, u.u_dent.d_ino); |
3e78e260 BJ |
299 | if(ip == NULL) |
300 | goto out1; | |
301 | if((ip->i_mode&IFMT)==IFDIR && !suser()) | |
302 | goto out; | |
303 | /* | |
304 | * Don't unlink a mounted file. | |
305 | */ | |
306 | if (ip->i_dev != pp->i_dev) { | |
307 | u.u_error = EBUSY; | |
308 | goto out; | |
309 | } | |
310 | if (ip->i_flag&ITEXT) | |
311 | xrele(ip); /* try once to free text */ | |
312 | /* | |
313 | if ((ip->i_flag&ITEXT) && ip->i_nlink==1) { | |
314 | u.u_error = ETXTBSY; | |
315 | goto out; | |
316 | } | |
317 | */ | |
6459ebe0 KM |
318 | if (u.u_count == 0) { |
319 | /* | |
320 | * first entry in block, so set d_ino to zero. | |
321 | */ | |
322 | u.u_base = (caddr_t)&u.u_dent; | |
323 | u.u_count = DIRSIZ(&u.u_dent); | |
324 | u.u_dent.d_ino = 0; | |
325 | writei(pp); | |
326 | } else { | |
327 | /* | |
328 | * updating preceeding entry to skip over current entry. | |
329 | */ | |
330 | fs = pp->i_fs; | |
331 | lbn = lblkno(fs, u.u_offset); | |
332 | base = blkoff(fs, u.u_offset); | |
333 | bn = fsbtodb(fs, bmap(pp, lbn, B_WRITE, base + u.u_count)); | |
334 | bp = bread(pp->i_dev, bn, blksize(fs, pp, lbn)); | |
335 | if (bp->b_flags & B_ERROR) { | |
336 | brelse(bp); | |
337 | goto out; | |
338 | } | |
339 | ((struct direct *)(bp->b_un.b_addr + base))->d_reclen += | |
340 | u.u_dent.d_reclen; | |
341 | bwrite(bp); | |
342 | pp->i_flag |= IUPD|ICHG; | |
343 | } | |
3e78e260 BJ |
344 | ip->i_nlink--; |
345 | ip->i_flag |= ICHG; | |
346 | ||
347 | out: | |
348 | iput(ip); | |
349 | out1: | |
350 | iput(pp); | |
351 | } | |
352 | ||
353 | /* | |
354 | * Seek system call | |
355 | */ | |
356 | seek() | |
357 | { | |
358 | register struct file *fp; | |
359 | register struct a { | |
360 | int fdes; | |
361 | off_t off; | |
362 | int sbase; | |
363 | } *uap; | |
364 | ||
365 | uap = (struct a *)u.u_ap; | |
366 | fp = getf(uap->fdes); | |
367 | if (fp == NULL) | |
368 | return; | |
369 | if (fp->f_flag&FSOCKET) { | |
370 | u.u_error = ESPIPE; | |
371 | return; | |
372 | } | |
373 | if (uap->sbase == 1) | |
374 | uap->off += fp->f_offset; | |
375 | else if (uap->sbase == 2) | |
376 | uap->off += fp->f_inode->i_size; | |
377 | fp->f_offset = uap->off; | |
378 | u.u_r.r_off = uap->off; | |
379 | } | |
380 | ||
381 | /* | |
382 | * Access system call | |
383 | */ | |
384 | saccess() | |
385 | { | |
386 | register svuid, svgid; | |
387 | register struct inode *ip; | |
388 | register struct a { | |
389 | char *fname; | |
390 | int fmode; | |
391 | } *uap; | |
392 | ||
393 | uap = (struct a *)u.u_ap; | |
394 | svuid = u.u_uid; | |
395 | svgid = u.u_gid; | |
396 | u.u_uid = u.u_ruid; | |
397 | u.u_gid = u.u_rgid; | |
398 | ip = namei(uchar, 0, 1); | |
399 | if (ip != NULL) { | |
400 | if (uap->fmode&(IREAD>>6)) | |
401 | (void) access(ip, IREAD); | |
402 | if (uap->fmode&(IWRITE>>6)) | |
403 | (void) access(ip, IWRITE); | |
404 | if (uap->fmode&(IEXEC>>6)) | |
405 | (void) access(ip, IEXEC); | |
406 | iput(ip); | |
407 | } | |
408 | u.u_uid = svuid; | |
409 | u.u_gid = svgid; | |
410 | } | |
d67a03eb BJ |
411 | |
412 | /* | |
413 | * the fstat system call. | |
414 | */ | |
415 | fstat() | |
416 | { | |
417 | register struct file *fp; | |
418 | register struct a { | |
419 | int fdes; | |
420 | struct stat *sb; | |
421 | } *uap; | |
422 | ||
423 | uap = (struct a *)u.u_ap; | |
424 | fp = getf(uap->fdes); | |
e92a04af | 425 | if (fp == NULL) |
d67a03eb | 426 | return; |
e92a04af | 427 | if (fp->f_flag & FSOCKET) |
cc15ab5d | 428 | u.u_error = sostat(fp->f_socket, uap->sb); |
e92a04af BJ |
429 | else |
430 | stat1(fp->f_inode, uap->sb); | |
d67a03eb BJ |
431 | } |
432 | ||
433 | /* | |
6459ebe0 | 434 | * Stat system call. This version follows links. |
d67a03eb BJ |
435 | */ |
436 | stat() | |
437 | { | |
438 | register struct inode *ip; | |
439 | register struct a { | |
440 | char *fname; | |
441 | struct stat *sb; | |
442 | } *uap; | |
443 | ||
444 | uap = (struct a *)u.u_ap; | |
66d4ba1b | 445 | ip = namei(uchar, 0, 1); |
e92a04af | 446 | if (ip == NULL) |
d67a03eb | 447 | return; |
a3aa7f92 | 448 | stat1(ip, uap->sb); |
d67a03eb BJ |
449 | iput(ip); |
450 | } | |
451 | ||
5485e062 | 452 | /* |
6459ebe0 | 453 | * Lstat system call. This version does not follow links. |
5485e062 BJ |
454 | */ |
455 | lstat() | |
456 | { | |
457 | register struct inode *ip; | |
458 | register struct a { | |
459 | char *fname; | |
460 | struct stat *sb; | |
461 | } *uap; | |
462 | ||
463 | uap = (struct a *)u.u_ap; | |
66d4ba1b | 464 | ip = namei(uchar, 0, 0); |
5485e062 BJ |
465 | if (ip == NULL) |
466 | return; | |
019b08c9 | 467 | stat1(ip, uap->sb); |
5485e062 BJ |
468 | iput(ip); |
469 | } | |
470 | ||
d67a03eb BJ |
471 | /* |
472 | * The basic routine for fstat and stat: | |
473 | * get the inode and pass appropriate parts back. | |
474 | */ | |
a3aa7f92 | 475 | stat1(ip, ub) |
e92a04af BJ |
476 | register struct inode *ip; |
477 | struct stat *ub; | |
d67a03eb | 478 | { |
d67a03eb BJ |
479 | struct stat ds; |
480 | ||
c0bb1685 | 481 | IUPDAT(ip, &time, &time, 0); |
d67a03eb | 482 | /* |
e92a04af | 483 | * First copy from inode table |
d67a03eb BJ |
484 | */ |
485 | ds.st_dev = ip->i_dev; | |
486 | ds.st_ino = ip->i_number; | |
487 | ds.st_mode = ip->i_mode; | |
488 | ds.st_nlink = ip->i_nlink; | |
489 | ds.st_uid = ip->i_uid; | |
490 | ds.st_gid = ip->i_gid; | |
6459ebe0 | 491 | ds.st_rdev = (dev_t)ip->i_rdev; |
a3aa7f92 | 492 | ds.st_size = ip->i_size; |
6459ebe0 KM |
493 | ds.st_atime = ip->i_atime; |
494 | ds.st_mtime = ip->i_mtime; | |
495 | ds.st_ctime = ip->i_ctime; | |
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 | } |