Commit | Line | Data |
---|---|---|
1d00c1cf | 1 | /* vfs_syscalls.c 6.12 84/07/20 */ |
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" | |
35e7c31a | 7 | #include "../h/kernel.h" |
d67a03eb | 8 | #include "../h/file.h" |
6459ebe0 | 9 | #include "../h/stat.h" |
3e78e260 | 10 | #include "../h/inode.h" |
6459ebe0 | 11 | #include "../h/fs.h" |
3e78e260 | 12 | #include "../h/buf.h" |
3e78e260 | 13 | #include "../h/proc.h" |
0a77f278 | 14 | #include "../h/quota.h" |
31949305 BJ |
15 | #include "../h/uio.h" |
16 | #include "../h/socket.h" | |
b32450f4 | 17 | #include "../h/socketvar.h" |
88a7a62a SL |
18 | #include "../h/mount.h" |
19 | ||
20 | extern struct fileops inodeops; | |
21 | struct file *getinode(); | |
3e78e260 | 22 | |
4f083fd7 SL |
23 | /* |
24 | * Change current working directory (``.''). | |
25 | */ | |
3e78e260 BJ |
26 | chdir() |
27 | { | |
28 | ||
29 | chdirec(&u.u_cdir); | |
30 | } | |
31 | ||
4f083fd7 SL |
32 | /* |
33 | * Change notion of root (``/'') directory. | |
34 | */ | |
3e78e260 BJ |
35 | chroot() |
36 | { | |
37 | ||
38 | if (suser()) | |
39 | chdirec(&u.u_rdir); | |
40 | } | |
41 | ||
4f083fd7 SL |
42 | /* |
43 | * Common routine for chroot and chdir. | |
44 | */ | |
3e78e260 | 45 | chdirec(ipp) |
528f664c | 46 | register struct inode **ipp; |
3e78e260 BJ |
47 | { |
48 | register struct inode *ip; | |
49 | struct a { | |
50 | char *fname; | |
715baff1 KM |
51 | } *uap = (struct a *)u.u_ap; |
52 | register struct nameidata *ndp = &u.u_nd; | |
3e78e260 | 53 | |
715baff1 KM |
54 | ndp->ni_nameiop = LOOKUP | FOLLOW; |
55 | ndp->ni_segflg = UIO_USERSPACE; | |
56 | ndp->ni_dirp = uap->fname; | |
57 | ip = namei(ndp); | |
4f083fd7 | 58 | if (ip == NULL) |
3e78e260 | 59 | return; |
4f083fd7 | 60 | if ((ip->i_mode&IFMT) != IFDIR) { |
3e78e260 BJ |
61 | u.u_error = ENOTDIR; |
62 | goto bad; | |
63 | } | |
4f083fd7 | 64 | if (access(ip, IEXEC)) |
3e78e260 | 65 | goto bad; |
a388503d | 66 | IUNLOCK(ip); |
8eee8525 KM |
67 | if (*ipp) |
68 | irele(*ipp); | |
3e78e260 BJ |
69 | *ipp = ip; |
70 | return; | |
71 | ||
72 | bad: | |
73 | iput(ip); | |
74 | } | |
75 | ||
76 | /* | |
77 | * Open system call. | |
78 | */ | |
79 | open() | |
80 | { | |
88a7a62a | 81 | struct a { |
3e78e260 | 82 | char *fname; |
528f664c | 83 | int mode; |
88a7a62a SL |
84 | int crtmode; |
85 | } *uap = (struct a *) u.u_ap; | |
3e78e260 | 86 | |
715baff1 | 87 | copen(uap->mode-FOPEN, uap->crtmode, uap->fname); |
3e78e260 BJ |
88 | } |
89 | ||
90 | /* | |
91 | * Creat system call. | |
92 | */ | |
88a7a62a | 93 | creat() |
3e78e260 | 94 | { |
88a7a62a | 95 | struct a { |
3e78e260 BJ |
96 | char *fname; |
97 | int fmode; | |
88a7a62a | 98 | } *uap = (struct a *)u.u_ap; |
3e78e260 | 99 | |
715baff1 | 100 | copen(FWRITE|FCREAT|FTRUNC, uap->fmode, uap->fname); |
3e78e260 BJ |
101 | } |
102 | ||
103 | /* | |
104 | * Common code for open and creat. | |
88a7a62a SL |
105 | * Check permissions, allocate an open file structure, |
106 | * and call the device open routine if any. | |
3e78e260 | 107 | */ |
715baff1 | 108 | copen(mode, arg, fname) |
88a7a62a SL |
109 | register int mode; |
110 | int arg; | |
715baff1 | 111 | caddr_t fname; |
3e78e260 | 112 | { |
88a7a62a | 113 | register struct inode *ip; |
3e78e260 | 114 | register struct file *fp; |
715baff1 | 115 | register struct nameidata *ndp = &u.u_nd; |
88a7a62a | 116 | int i; |
3e78e260 | 117 | |
88a7a62a SL |
118 | #ifdef notdef |
119 | if ((mode&(FREAD|FWRITE)) == 0) { | |
120 | u.u_error = EINVAL; | |
121 | return; | |
122 | } | |
123 | #endif | |
715baff1 KM |
124 | ndp->ni_segflg = UIO_USERSPACE; |
125 | ndp->ni_dirp = fname; | |
88a7a62a | 126 | if (mode&FCREAT) { |
715baff1 KM |
127 | ndp->ni_nameiop = CREATE | FOLLOW; |
128 | ip = namei(ndp); | |
88a7a62a SL |
129 | if (ip == NULL) { |
130 | if (u.u_error) | |
131 | return; | |
715baff1 | 132 | ip = maknode(arg&07777&(~ISVTX), ndp); |
88a7a62a SL |
133 | if (ip == NULL) |
134 | return; | |
135 | mode &= ~FTRUNC; | |
136 | } else { | |
137 | if (mode&FEXCL) { | |
138 | u.u_error = EEXIST; | |
139 | iput(ip); | |
140 | return; | |
141 | } | |
142 | mode &= ~FCREAT; | |
143 | } | |
144 | } else { | |
715baff1 KM |
145 | ndp->ni_nameiop = LOOKUP | FOLLOW; |
146 | ip = namei(ndp); | |
88a7a62a SL |
147 | if (ip == NULL) |
148 | return; | |
149 | } | |
150 | if ((ip->i_mode & IFMT) == IFSOCK) { | |
151 | u.u_error = EOPNOTSUPP; | |
152 | goto bad; | |
153 | } | |
154 | if ((mode&FCREAT) == 0) { | |
3e78e260 | 155 | if (mode&FREAD) |
528f664c SL |
156 | if (access(ip, IREAD)) |
157 | goto bad; | |
09bf91df | 158 | if (mode&(FWRITE|FTRUNC)) { |
528f664c SL |
159 | if (access(ip, IWRITE)) |
160 | goto bad; | |
161 | if ((ip->i_mode&IFMT) == IFDIR) { | |
3e78e260 | 162 | u.u_error = EISDIR; |
528f664c SL |
163 | goto bad; |
164 | } | |
3e78e260 BJ |
165 | } |
166 | } | |
88a7a62a SL |
167 | fp = falloc(); |
168 | if (fp == NULL) | |
169 | goto bad; | |
170 | if (mode&FTRUNC) | |
4f083fd7 | 171 | itrunc(ip, (u_long)0); |
a388503d | 172 | IUNLOCK(ip); |
88a7a62a SL |
173 | fp->f_flag = mode&FMASK; |
174 | fp->f_type = DTYPE_INODE; | |
175 | fp->f_ops = &inodeops; | |
176 | fp->f_data = (caddr_t)ip; | |
3e78e260 | 177 | i = u.u_r.r_val1; |
88a7a62a SL |
178 | if (setjmp(&u.u_qsave)) { |
179 | if (u.u_error == 0) | |
180 | u.u_error = EINTR; | |
181 | u.u_ofile[i] = NULL; | |
182 | closef(fp); | |
3e78e260 | 183 | return; |
528f664c | 184 | } |
88a7a62a SL |
185 | u.u_error = openi(ip, mode); |
186 | if (u.u_error == 0) | |
187 | return; | |
3e78e260 BJ |
188 | u.u_ofile[i] = NULL; |
189 | fp->f_count--; | |
8eee8525 | 190 | irele(ip); |
528f664c SL |
191 | return; |
192 | bad: | |
193 | iput(ip); | |
3e78e260 BJ |
194 | } |
195 | ||
196 | /* | |
197 | * Mknod system call | |
198 | */ | |
199 | mknod() | |
200 | { | |
201 | register struct inode *ip; | |
202 | register struct a { | |
203 | char *fname; | |
204 | int fmode; | |
205 | int dev; | |
715baff1 KM |
206 | } *uap = (struct a *)u.u_ap; |
207 | register struct nameidata *ndp = &u.u_nd; | |
3e78e260 | 208 | |
88a7a62a SL |
209 | if (!suser()) |
210 | return; | |
715baff1 KM |
211 | ndp->ni_nameiop = CREATE; |
212 | ndp->ni_segflg = UIO_USERSPACE; | |
213 | ndp->ni_dirp = uap->fname; | |
214 | ip = namei(ndp); | |
88a7a62a SL |
215 | if (ip != NULL) { |
216 | u.u_error = EEXIST; | |
217 | goto out; | |
3e78e260 BJ |
218 | } |
219 | if (u.u_error) | |
220 | return; | |
715baff1 | 221 | ip = maknode(uap->fmode, ndp); |
3e78e260 BJ |
222 | if (ip == NULL) |
223 | return; | |
88a7a62a SL |
224 | switch (ip->i_mode & IFMT) { |
225 | ||
7bfaea72 | 226 | case IFMT: /* used by badsect to flag bad sectors */ |
88a7a62a SL |
227 | case IFCHR: |
228 | case IFBLK: | |
229 | if (uap->dev) { | |
230 | /* | |
231 | * Want to be able to use this to make badblock | |
232 | * inodes, so don't truncate the dev number. | |
233 | */ | |
234 | ip->i_rdev = uap->dev; | |
235 | ip->i_flag |= IACC|IUPD|ICHG; | |
236 | } | |
3e78e260 BJ |
237 | } |
238 | ||
239 | out: | |
240 | iput(ip); | |
241 | } | |
242 | ||
243 | /* | |
244 | * link system call | |
245 | */ | |
246 | link() | |
247 | { | |
248 | register struct inode *ip, *xp; | |
249 | register struct a { | |
250 | char *target; | |
251 | char *linkname; | |
715baff1 KM |
252 | } *uap = (struct a *)u.u_ap; |
253 | register struct nameidata *ndp = &u.u_nd; | |
3e78e260 | 254 | |
715baff1 KM |
255 | ndp->ni_nameiop = LOOKUP | FOLLOW; |
256 | ndp->ni_segflg = UIO_USERSPACE; | |
257 | ndp->ni_dirp = uap->target; | |
258 | ip = namei(ndp); /* well, this routine is doomed anyhow */ | |
3e78e260 BJ |
259 | if (ip == NULL) |
260 | return; | |
4f083fd7 | 261 | if ((ip->i_mode&IFMT) == IFDIR && !suser()) { |
f94ceb3b BJ |
262 | iput(ip); |
263 | return; | |
264 | } | |
3e78e260 BJ |
265 | ip->i_nlink++; |
266 | ip->i_flag |= ICHG; | |
3fd23f5c | 267 | iupdat(ip, &time, &time, 1); |
a388503d | 268 | IUNLOCK(ip); |
715baff1 KM |
269 | ndp->ni_nameiop = CREATE; |
270 | ndp->ni_segflg = UIO_USERSPACE; | |
271 | ndp->ni_dirp = (caddr_t)uap->linkname; | |
272 | xp = namei(ndp); | |
3e78e260 BJ |
273 | if (xp != NULL) { |
274 | u.u_error = EEXIST; | |
275 | iput(xp); | |
276 | goto out; | |
277 | } | |
278 | if (u.u_error) | |
279 | goto out; | |
715baff1 KM |
280 | if (ndp->ni_pdir->i_dev != ip->i_dev) { |
281 | iput(ndp->ni_pdir); | |
3e78e260 BJ |
282 | u.u_error = EXDEV; |
283 | goto out; | |
284 | } | |
715baff1 | 285 | u.u_error = direnter(ip, ndp); |
3e78e260 BJ |
286 | out: |
287 | if (u.u_error) { | |
288 | ip->i_nlink--; | |
289 | ip->i_flag |= ICHG; | |
290 | } | |
8eee8525 | 291 | irele(ip); |
3e78e260 BJ |
292 | } |
293 | ||
294 | /* | |
295 | * symlink -- make a symbolic link | |
296 | */ | |
297 | symlink() | |
298 | { | |
299 | register struct a { | |
300 | char *target; | |
301 | char *linkname; | |
715baff1 | 302 | } *uap = (struct a *)u.u_ap; |
3e78e260 BJ |
303 | register struct inode *ip; |
304 | register char *tp; | |
305 | register c, nc; | |
715baff1 | 306 | register struct nameidata *ndp = &u.u_nd; |
3e78e260 | 307 | |
3e78e260 BJ |
308 | tp = uap->target; |
309 | nc = 0; | |
310 | while (c = fubyte(tp)) { | |
311 | if (c < 0) { | |
312 | u.u_error = EFAULT; | |
313 | return; | |
314 | } | |
315 | tp++; | |
316 | nc++; | |
317 | } | |
715baff1 KM |
318 | ndp->ni_nameiop = CREATE; |
319 | ndp->ni_segflg = UIO_USERSPACE; | |
320 | ndp->ni_dirp = uap->linkname; | |
321 | ip = namei(ndp); | |
3e78e260 BJ |
322 | if (ip) { |
323 | iput(ip); | |
324 | u.u_error = EEXIST; | |
325 | return; | |
326 | } | |
327 | if (u.u_error) | |
328 | return; | |
715baff1 | 329 | ip = maknode(IFLNK | 0777, ndp); |
3e78e260 BJ |
330 | if (ip == NULL) |
331 | return; | |
31949305 | 332 | u.u_error = rdwri(UIO_WRITE, ip, uap->target, nc, 0, 0, (int *)0); |
4f083fd7 | 333 | /* handle u.u_error != 0 */ |
3e78e260 BJ |
334 | iput(ip); |
335 | } | |
336 | ||
337 | /* | |
338 | * Unlink system call. | |
339 | * Hard to avoid races here, especially | |
340 | * in unlinking directories. | |
341 | */ | |
342 | unlink() | |
343 | { | |
3e78e260 BJ |
344 | struct a { |
345 | char *fname; | |
715baff1 | 346 | } *uap = (struct a *)u.u_ap; |
4f083fd7 | 347 | register struct inode *ip, *dp; |
715baff1 | 348 | register struct nameidata *ndp = &u.u_nd; |
3e78e260 | 349 | |
715baff1 KM |
350 | ndp->ni_nameiop = DELETE | LOCKPARENT; |
351 | ndp->ni_segflg = UIO_USERSPACE; | |
352 | ndp->ni_dirp = uap->fname; | |
353 | ip = namei(ndp); | |
4f083fd7 | 354 | if (ip == NULL) |
3e78e260 | 355 | return; |
715baff1 | 356 | dp = ndp->ni_pdir; |
4f083fd7 | 357 | if ((ip->i_mode&IFMT) == IFDIR && !suser()) |
3e78e260 BJ |
358 | goto out; |
359 | /* | |
360 | * Don't unlink a mounted file. | |
361 | */ | |
4f083fd7 | 362 | if (ip->i_dev != dp->i_dev) { |
3e78e260 BJ |
363 | u.u_error = EBUSY; |
364 | goto out; | |
365 | } | |
366 | if (ip->i_flag&ITEXT) | |
367 | xrele(ip); /* try once to free text */ | |
715baff1 | 368 | if (dirremove(ndp)) { |
64d3a787 BJ |
369 | ip->i_nlink--; |
370 | ip->i_flag |= ICHG; | |
6459ebe0 | 371 | } |
3e78e260 | 372 | out: |
4f083fd7 | 373 | if (dp == ip) |
8eee8525 KM |
374 | irele(ip); |
375 | else | |
376 | iput(ip); | |
4f083fd7 | 377 | iput(dp); |
3e78e260 BJ |
378 | } |
379 | ||
380 | /* | |
381 | * Seek system call | |
382 | */ | |
35e7c31a | 383 | lseek() |
3e78e260 BJ |
384 | { |
385 | register struct file *fp; | |
386 | register struct a { | |
528f664c | 387 | int fd; |
3e78e260 BJ |
388 | off_t off; |
389 | int sbase; | |
715baff1 | 390 | } *uap = (struct a *)u.u_ap; |
3e78e260 | 391 | |
8462a185 SL |
392 | GETF(fp, uap->fd); |
393 | if (fp->f_type != DTYPE_INODE) { | |
394 | u.u_error = ESPIPE; | |
3e78e260 | 395 | return; |
8462a185 | 396 | } |
b4d1aee9 SL |
397 | switch (uap->sbase) { |
398 | ||
399 | case L_INCR: | |
400 | fp->f_offset += uap->off; | |
401 | break; | |
402 | ||
403 | case L_XTND: | |
404 | fp->f_offset = uap->off + ((struct inode *)fp->f_data)->i_size; | |
405 | break; | |
406 | ||
407 | case L_SET: | |
408 | fp->f_offset = uap->off; | |
409 | break; | |
410 | ||
411 | default: | |
412 | u.u_error = EINVAL; | |
413 | return; | |
414 | } | |
415 | u.u_r.r_off = fp->f_offset; | |
3e78e260 BJ |
416 | } |
417 | ||
418 | /* | |
419 | * Access system call | |
420 | */ | |
421 | saccess() | |
422 | { | |
423 | register svuid, svgid; | |
424 | register struct inode *ip; | |
425 | register struct a { | |
426 | char *fname; | |
427 | int fmode; | |
715baff1 KM |
428 | } *uap = (struct a *)u.u_ap; |
429 | register struct nameidata *ndp = &u.u_nd; | |
3e78e260 | 430 | |
3e78e260 BJ |
431 | svuid = u.u_uid; |
432 | svgid = u.u_gid; | |
433 | u.u_uid = u.u_ruid; | |
434 | u.u_gid = u.u_rgid; | |
715baff1 KM |
435 | ndp->ni_nameiop = LOOKUP | FOLLOW; |
436 | ndp->ni_segflg = UIO_USERSPACE; | |
437 | ndp->ni_dirp = uap->fname; | |
438 | ip = namei(ndp); | |
3e78e260 | 439 | if (ip != NULL) { |
88a7a62a | 440 | if ((uap->fmode&R_OK) && access(ip, IREAD)) |
528f664c | 441 | goto done; |
88a7a62a | 442 | if ((uap->fmode&W_OK) && access(ip, IWRITE)) |
528f664c | 443 | goto done; |
88a7a62a | 444 | if ((uap->fmode&X_OK) && access(ip, IEXEC)) |
528f664c SL |
445 | goto done; |
446 | done: | |
3e78e260 BJ |
447 | iput(ip); |
448 | } | |
449 | u.u_uid = svuid; | |
450 | u.u_gid = svgid; | |
451 | } | |
d67a03eb | 452 | |
d67a03eb | 453 | /* |
6459ebe0 | 454 | * Stat system call. This version follows links. |
d67a03eb BJ |
455 | */ |
456 | stat() | |
457 | { | |
d67a03eb | 458 | |
715baff1 | 459 | stat1(FOLLOW); |
d67a03eb BJ |
460 | } |
461 | ||
5485e062 | 462 | /* |
6459ebe0 | 463 | * Lstat system call. This version does not follow links. |
5485e062 BJ |
464 | */ |
465 | lstat() | |
88a7a62a SL |
466 | { |
467 | ||
715baff1 | 468 | stat1(NOFOLLOW); |
88a7a62a SL |
469 | } |
470 | ||
471 | stat1(follow) | |
472 | int follow; | |
5485e062 BJ |
473 | { |
474 | register struct inode *ip; | |
475 | register struct a { | |
476 | char *fname; | |
88a7a62a | 477 | struct stat *ub; |
715baff1 | 478 | } *uap = (struct a *)u.u_ap; |
88a7a62a | 479 | struct stat sb; |
715baff1 | 480 | register struct nameidata *ndp = &u.u_nd; |
5485e062 | 481 | |
715baff1 KM |
482 | ndp->ni_nameiop = LOOKUP | follow; |
483 | ndp->ni_segflg = UIO_USERSPACE; | |
484 | ndp->ni_dirp = uap->fname; | |
485 | ip = namei(ndp); | |
5485e062 BJ |
486 | if (ip == NULL) |
487 | return; | |
0eaf24e3 | 488 | (void) ino_stat(ip, &sb); |
5485e062 | 489 | iput(ip); |
88a7a62a | 490 | u.u_error = copyout((caddr_t)&sb, (caddr_t)uap->ub, sizeof (sb)); |
d67a03eb BJ |
491 | } |
492 | ||
493 | /* | |
5485e062 BJ |
494 | * Return target name of a symbolic link |
495 | */ | |
496 | readlink() | |
497 | { | |
498 | register struct inode *ip; | |
499 | register struct a { | |
500 | char *name; | |
501 | char *buf; | |
502 | int count; | |
31949305 | 503 | } *uap = (struct a *)u.u_ap; |
715baff1 | 504 | register struct nameidata *ndp = &u.u_nd; |
31949305 | 505 | int resid; |
5485e062 | 506 | |
715baff1 KM |
507 | ndp->ni_nameiop = LOOKUP; |
508 | ndp->ni_segflg = UIO_USERSPACE; | |
509 | ndp->ni_dirp = uap->name; | |
510 | ip = namei(ndp); | |
5485e062 BJ |
511 | if (ip == NULL) |
512 | return; | |
513 | if ((ip->i_mode&IFMT) != IFLNK) { | |
514 | u.u_error = ENXIO; | |
515 | goto out; | |
516 | } | |
31949305 | 517 | u.u_error = rdwri(UIO_READ, ip, uap->buf, uap->count, 0, 0, &resid); |
5485e062 BJ |
518 | out: |
519 | iput(ip); | |
31949305 | 520 | u.u_r.r_val1 = uap->count - resid; |
5485e062 BJ |
521 | } |
522 | ||
4f083fd7 SL |
523 | /* |
524 | * Change mode of a file given path name. | |
525 | */ | |
3e78e260 | 526 | chmod() |
5485e062 | 527 | { |
528f664c SL |
528 | struct inode *ip; |
529 | struct a { | |
3e78e260 BJ |
530 | char *fname; |
531 | int fmode; | |
715baff1 | 532 | } *uap = (struct a *)u.u_ap; |
5485e062 | 533 | |
715baff1 | 534 | if ((ip = owner(uap->fname, FOLLOW)) == NULL) |
5485e062 | 535 | return; |
528f664c | 536 | chmod1(ip, uap->fmode); |
4f083fd7 | 537 | iput(ip); |
528f664c | 538 | } |
f94ceb3b | 539 | |
4f083fd7 SL |
540 | /* |
541 | * Change mode of a file given a file descriptor. | |
542 | */ | |
528f664c SL |
543 | fchmod() |
544 | { | |
545 | struct a { | |
546 | int fd; | |
547 | int fmode; | |
715baff1 | 548 | } *uap = (struct a *)u.u_ap; |
528f664c SL |
549 | register struct inode *ip; |
550 | register struct file *fp; | |
551 | ||
88a7a62a | 552 | fp = getinode(uap->fd); |
528f664c SL |
553 | if (fp == NULL) |
554 | return; | |
88a7a62a | 555 | ip = (struct inode *)fp->f_data; |
4f083fd7 | 556 | if (u.u_uid != ip->i_uid && !suser()) |
528f664c | 557 | return; |
a388503d | 558 | ILOCK(ip); |
528f664c | 559 | chmod1(ip, uap->fmode); |
a388503d | 560 | IUNLOCK(ip); |
528f664c SL |
561 | } |
562 | ||
4f083fd7 SL |
563 | /* |
564 | * Change the mode on a file. | |
565 | * Inode must be locked before calling. | |
566 | */ | |
528f664c SL |
567 | chmod1(ip, mode) |
568 | register struct inode *ip; | |
569 | register int mode; | |
570 | { | |
197da11b | 571 | |
3e78e260 | 572 | ip->i_mode &= ~07777; |
f94ceb3b | 573 | if (u.u_uid) { |
528f664c | 574 | mode &= ~ISVTX; |
bb1b75f4 SL |
575 | if (!groupmember(ip->i_gid)) |
576 | mode &= ~ISGID; | |
f94ceb3b | 577 | } |
528f664c | 578 | ip->i_mode |= mode&07777; |
3e78e260 BJ |
579 | ip->i_flag |= ICHG; |
580 | if (ip->i_flag&ITEXT && (ip->i_mode&ISVTX)==0) | |
581 | xrele(ip); | |
5485e062 BJ |
582 | } |
583 | ||
4f083fd7 SL |
584 | /* |
585 | * Set ownership given a path name. | |
586 | */ | |
3e78e260 | 587 | chown() |
d67a03eb | 588 | { |
528f664c SL |
589 | struct inode *ip; |
590 | struct a { | |
3e78e260 BJ |
591 | char *fname; |
592 | int uid; | |
593 | int gid; | |
715baff1 | 594 | } *uap = (struct a *)u.u_ap; |
d67a03eb | 595 | |
715baff1 | 596 | if (!suser() || (ip = owner(uap->fname, NOFOLLOW)) == NULL) |
d67a03eb | 597 | return; |
bb1b75f4 | 598 | u.u_error = chown1(ip, uap->uid, uap->gid); |
4f083fd7 | 599 | iput(ip); |
528f664c | 600 | } |
f94ceb3b | 601 | |
4f083fd7 SL |
602 | /* |
603 | * Set ownership given a file descriptor. | |
604 | */ | |
528f664c SL |
605 | fchown() |
606 | { | |
607 | struct a { | |
608 | int fd; | |
609 | int uid; | |
610 | int gid; | |
715baff1 | 611 | } *uap = (struct a *)u.u_ap; |
528f664c SL |
612 | register struct inode *ip; |
613 | register struct file *fp; | |
614 | ||
88a7a62a | 615 | fp = getinode(uap->fd); |
528f664c SL |
616 | if (fp == NULL) |
617 | return; | |
88a7a62a | 618 | ip = (struct inode *)fp->f_data; |
aad8ef38 | 619 | if (!suser()) |
528f664c | 620 | return; |
a388503d | 621 | ILOCK(ip); |
bb1b75f4 | 622 | u.u_error = chown1(ip, uap->uid, uap->gid); |
a388503d | 623 | IUNLOCK(ip); |
528f664c SL |
624 | } |
625 | ||
626 | /* | |
627 | * Perform chown operation on inode ip; | |
628 | * inode must be locked prior to call. | |
629 | */ | |
630 | chown1(ip, uid, gid) | |
631 | register struct inode *ip; | |
632 | int uid, gid; | |
633 | { | |
634 | #ifdef QUOTA | |
635 | register long change; | |
bb1b75f4 | 636 | #endif |
528f664c | 637 | |
bb1b75f4 SL |
638 | if (uid == -1) |
639 | uid = ip->i_uid; | |
640 | if (gid == -1) | |
641 | gid = ip->i_gid; | |
bb1b75f4 | 642 | #ifdef QUOTA |
3809bf69 | 643 | if (ip->i_uid == uid) /* this just speeds things a little */ |
0a77f278 | 644 | change = 0; |
2e073567 SL |
645 | else |
646 | change = ip->i_blocks; | |
647 | (void) chkdq(ip, -change, 1); | |
648 | (void) chkiq(ip->i_dev, ip, ip->i_uid, 1); | |
0a77f278 | 649 | dqrele(ip->i_dquot); |
f94ceb3b | 650 | #endif |
bb1b75f4 SL |
651 | ip->i_uid = uid; |
652 | ip->i_gid = gid; | |
3e78e260 BJ |
653 | ip->i_flag |= ICHG; |
654 | if (u.u_ruid != 0) | |
655 | ip->i_mode &= ~(ISUID|ISGID); | |
528f664c | 656 | #ifdef QUOTA |
0a77f278 | 657 | ip->i_dquot = inoquota(ip); |
2e073567 SL |
658 | (void) chkdq(ip, change, 1); |
659 | (void) chkiq(ip->i_dev, (struct inode *)NULL, uid, 1); | |
660 | return (u.u_error); /* should == 0 ALWAYS !! */ | |
661 | #else | |
bb1b75f4 | 662 | return (0); |
2e073567 | 663 | #endif |
d67a03eb BJ |
664 | } |
665 | ||
bb1b75f4 SL |
666 | utimes() |
667 | { | |
668 | register struct a { | |
669 | char *fname; | |
670 | struct timeval *tptr; | |
671 | } *uap = (struct a *)u.u_ap; | |
672 | register struct inode *ip; | |
673 | struct timeval tv[2]; | |
674 | ||
715baff1 | 675 | if ((ip = owner(uap->fname, FOLLOW)) == NULL) |
bb1b75f4 SL |
676 | return; |
677 | u.u_error = copyin((caddr_t)uap->tptr, (caddr_t)tv, sizeof (tv)); | |
678 | if (u.u_error == 0) { | |
679 | ip->i_flag |= IACC|IUPD|ICHG; | |
680 | iupdat(ip, &tv[0], &tv[1], 0); | |
681 | } | |
682 | iput(ip); | |
683 | } | |
d67a03eb | 684 | |
4f083fd7 SL |
685 | /* |
686 | * Flush any pending I/O. | |
687 | */ | |
3e78e260 | 688 | sync() |
d67a03eb | 689 | { |
d67a03eb | 690 | |
3fd23f5c | 691 | update(); |
d67a03eb | 692 | } |
64d3a787 | 693 | |
4f083fd7 SL |
694 | /* |
695 | * Truncate a file given its path name. | |
696 | */ | |
528f664c SL |
697 | truncate() |
698 | { | |
699 | struct a { | |
700 | char *fname; | |
4f083fd7 | 701 | u_long length; |
31949305 | 702 | } *uap = (struct a *)u.u_ap; |
528f664c | 703 | struct inode *ip; |
715baff1 | 704 | register struct nameidata *ndp = &u.u_nd; |
528f664c | 705 | |
715baff1 KM |
706 | ndp->ni_nameiop = LOOKUP | FOLLOW; |
707 | ndp->ni_segflg = UIO_USERSPACE; | |
708 | ndp->ni_dirp = uap->fname; | |
709 | ip = namei(ndp); | |
528f664c SL |
710 | if (ip == NULL) |
711 | return; | |
712 | if (access(ip, IWRITE)) | |
713 | goto bad; | |
714 | if ((ip->i_mode&IFMT) == IFDIR) { | |
715 | u.u_error = EISDIR; | |
716 | goto bad; | |
717 | } | |
718 | itrunc(ip, uap->length); | |
528f664c SL |
719 | bad: |
720 | iput(ip); | |
721 | } | |
722 | ||
4f083fd7 SL |
723 | /* |
724 | * Truncate a file given a file descriptor. | |
725 | */ | |
528f664c SL |
726 | ftruncate() |
727 | { | |
728 | struct a { | |
729 | int fd; | |
4f083fd7 | 730 | u_long length; |
31949305 | 731 | } *uap = (struct a *)u.u_ap; |
528f664c SL |
732 | struct inode *ip; |
733 | struct file *fp; | |
734 | ||
88a7a62a | 735 | fp = getinode(uap->fd); |
528f664c SL |
736 | if (fp == NULL) |
737 | return; | |
528f664c SL |
738 | if ((fp->f_flag&FWRITE) == 0) { |
739 | u.u_error = EINVAL; | |
740 | return; | |
741 | } | |
88a7a62a | 742 | ip = (struct inode *)fp->f_data; |
a388503d | 743 | ILOCK(ip); |
528f664c | 744 | itrunc(ip, uap->length); |
a388503d | 745 | IUNLOCK(ip); |
4f083fd7 SL |
746 | } |
747 | ||
748 | /* | |
749 | * Synch an open file. | |
750 | */ | |
751 | fsync() | |
752 | { | |
753 | struct a { | |
754 | int fd; | |
755 | } *uap = (struct a *)u.u_ap; | |
756 | struct inode *ip; | |
757 | struct file *fp; | |
758 | ||
88a7a62a | 759 | fp = getinode(uap->fd); |
4f083fd7 SL |
760 | if (fp == NULL) |
761 | return; | |
88a7a62a | 762 | ip = (struct inode *)fp->f_data; |
a388503d | 763 | ILOCK(ip); |
4f083fd7 | 764 | syncip(ip); |
a388503d | 765 | IUNLOCK(ip); |
528f664c SL |
766 | } |
767 | ||
4f083fd7 SL |
768 | /* |
769 | * Rename system call. | |
770 | * rename("foo", "bar"); | |
771 | * is essentially | |
772 | * unlink("bar"); | |
773 | * link("foo", "bar"); | |
774 | * unlink("foo"); | |
775 | * but ``atomically''. Can't do full commit without saving state in the | |
776 | * inode on disk which isn't feasible at this time. Best we can do is | |
777 | * always guarantee the target exists. | |
778 | * | |
779 | * Basic algorithm is: | |
780 | * | |
781 | * 1) Bump link count on source while we're linking it to the | |
782 | * target. This also insure the inode won't be deleted out | |
783 | * from underneath us while we work. | |
784 | * 2) Link source to destination. If destination already exists, | |
785 | * delete it first. | |
786 | * 3) Unlink source reference to inode if still around. | |
787 | * 4) If a directory was moved and the parent of the destination | |
788 | * is different from the source, patch the ".." entry in the | |
789 | * directory. | |
790 | * | |
791 | * Source and destination must either both be directories, or both | |
792 | * not be directories. If target is a directory, it must be empty. | |
793 | */ | |
528f664c SL |
794 | rename() |
795 | { | |
796 | struct a { | |
797 | char *from; | |
798 | char *to; | |
715baff1 | 799 | } *uap = (struct a *)u.u_ap; |
4f083fd7 | 800 | register struct inode *ip, *xp, *dp; |
963fd9f8 | 801 | struct inode *zp; |
4f083fd7 | 802 | int oldparent, parentdifferent, doingdirectory; |
715baff1 | 803 | register struct nameidata *ndp = &u.u_nd; |
a5390dce | 804 | int error = 0; |
4f083fd7 | 805 | |
715baff1 KM |
806 | ndp->ni_nameiop = DELETE | LOCKPARENT; |
807 | ndp->ni_segflg = UIO_USERSPACE; | |
808 | ndp->ni_dirp = uap->from; | |
809 | ip = namei(ndp); | |
4f083fd7 SL |
810 | if (ip == NULL) |
811 | return; | |
715baff1 | 812 | dp = ndp->ni_pdir; |
4f083fd7 SL |
813 | oldparent = 0, doingdirectory = 0; |
814 | if ((ip->i_mode&IFMT) == IFDIR) { | |
815 | register struct direct *d; | |
816 | ||
715baff1 | 817 | d = &ndp->ni_dent; |
4f083fd7 | 818 | /* |
046f18d1 | 819 | * Avoid ".", "..", and aliases of "." for obvious reasons. |
4f083fd7 | 820 | */ |
046f18d1 SL |
821 | if ((d->d_namlen == 1 && d->d_name[0] == '.') || |
822 | (d->d_namlen == 2 && bcmp(d->d_name, "..", 2) == 0) || | |
823 | (dp == ip)) { | |
824 | iput(dp); | |
825 | if (dp == ip) | |
826 | irele(ip); | |
827 | else | |
4f083fd7 | 828 | iput(ip); |
046f18d1 SL |
829 | u.u_error = EINVAL; |
830 | return; | |
4f083fd7 SL |
831 | } |
832 | oldparent = dp->i_number; | |
833 | doingdirectory++; | |
834 | } | |
046f18d1 | 835 | iput(dp); |
4f083fd7 SL |
836 | |
837 | /* | |
838 | * 1) Bump link count while we're moving stuff | |
839 | * around. If we crash somewhere before | |
840 | * completing our work, the link count | |
841 | * may be wrong, but correctable. | |
842 | */ | |
843 | ip->i_nlink++; | |
844 | ip->i_flag |= ICHG; | |
845 | iupdat(ip, &time, &time, 1); | |
a388503d | 846 | IUNLOCK(ip); |
4f083fd7 SL |
847 | |
848 | /* | |
849 | * When the target exists, both the directory | |
850 | * and target inodes are returned locked. | |
851 | */ | |
715baff1 KM |
852 | ndp->ni_nameiop = CREATE | LOCKPARENT | NOCACHE; |
853 | ndp->ni_dirp = (caddr_t)uap->to; | |
854 | xp = namei(ndp); | |
a5390dce SL |
855 | if (u.u_error) { |
856 | error = u.u_error; | |
4f083fd7 | 857 | goto out; |
a5390dce | 858 | } |
715baff1 | 859 | dp = ndp->ni_pdir; |
046f18d1 SL |
860 | /* |
861 | * If ".." must be changed (ie the directory gets a new | |
81552f0f KM |
862 | * parent) then the source directory must not be in the |
863 | * directory heirarchy above the target, as this would | |
864 | * orphan everything below the source directory. Also | |
865 | * the user must have write permission in the source so | |
866 | * as to be able to change "..". We must repeat the call | |
867 | * to namei, as the parent directory is unlocked by the | |
868 | * call to checkpath(). | |
046f18d1 SL |
869 | */ |
870 | parentdifferent = oldparent != dp->i_number; | |
81552f0f KM |
871 | if (doingdirectory && parentdifferent) { |
872 | if (access(ip, IWRITE)) | |
873 | goto bad; | |
874 | do { | |
715baff1 | 875 | dp = ndp->ni_pdir; |
81552f0f KM |
876 | if (xp != NULL) |
877 | iput(xp); | |
878 | u.u_error = checkpath(ip, dp); | |
879 | if (u.u_error) | |
880 | goto out; | |
715baff1 | 881 | xp = namei(ndp); |
81552f0f KM |
882 | if (u.u_error) { |
883 | error = u.u_error; | |
884 | goto out; | |
885 | } | |
715baff1 | 886 | } while (dp != ndp->ni_pdir); |
81552f0f | 887 | } |
4f083fd7 SL |
888 | /* |
889 | * 2) If target doesn't exist, link the target | |
890 | * to the source and unlink the source. | |
891 | * Otherwise, rewrite the target directory | |
892 | * entry to reference the source inode and | |
893 | * expunge the original entry's existence. | |
894 | */ | |
4f083fd7 SL |
895 | if (xp == NULL) { |
896 | if (dp->i_dev != ip->i_dev) { | |
a5390dce | 897 | error = EXDEV; |
4f083fd7 SL |
898 | goto bad; |
899 | } | |
900 | /* | |
901 | * Account for ".." in directory. | |
902 | * When source and destination have the | |
903 | * same parent we don't fool with the | |
904 | * link count -- this isn't required | |
905 | * because we do a similar check below. | |
906 | */ | |
907 | if (doingdirectory && parentdifferent) { | |
908 | dp->i_nlink++; | |
909 | dp->i_flag |= ICHG; | |
910 | iupdat(dp, &time, &time, 1); | |
911 | } | |
715baff1 | 912 | error = direnter(ip, ndp); |
f2a5ad78 | 913 | if (error) |
4f083fd7 SL |
914 | goto out; |
915 | } else { | |
916 | if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) { | |
a5390dce | 917 | error = EXDEV; |
4f083fd7 SL |
918 | goto bad; |
919 | } | |
e69c3c9c SL |
920 | /* |
921 | * Short circuit rename(foo, foo). | |
922 | */ | |
923 | if (xp->i_number == ip->i_number) | |
924 | goto bad; | |
4f083fd7 | 925 | /* |
a5390dce SL |
926 | * Target must be empty if a directory |
927 | * and have no links to it. | |
4f083fd7 SL |
928 | * Also, insure source and target are |
929 | * compatible (both directories, or both | |
930 | * not directories). | |
931 | */ | |
932 | if ((xp->i_mode&IFMT) == IFDIR) { | |
a5390dce SL |
933 | if (!dirempty(xp) || xp->i_nlink > 2) { |
934 | error = ENOTEMPTY; | |
4f083fd7 SL |
935 | goto bad; |
936 | } | |
937 | if (!doingdirectory) { | |
a5390dce | 938 | error = ENOTDIR; |
4f083fd7 SL |
939 | goto bad; |
940 | } | |
941 | } else if (doingdirectory) { | |
a5390dce | 942 | error = EISDIR; |
4f083fd7 SL |
943 | goto bad; |
944 | } | |
715baff1 | 945 | dirrewrite(dp, ip, ndp); |
a5390dce SL |
946 | if (u.u_error) { |
947 | error = u.u_error; | |
4f083fd7 | 948 | goto bad1; |
a5390dce | 949 | } |
4f083fd7 | 950 | /* |
a5390dce SL |
951 | * Adjust the link count of the target to |
952 | * reflect the dirrewrite above. If this is | |
953 | * a directory it is empty and there are | |
954 | * no links to it, so we can squash the inode and | |
955 | * any space associated with it. We disallowed | |
956 | * renaming over top of a directory with links to | |
957 | * it above, as we've no way to determine if | |
958 | * we've got a link or the directory itself, and | |
959 | * if we get a link, then ".." will be screwed up. | |
4f083fd7 | 960 | */ |
a5390dce | 961 | xp->i_nlink--; |
4f083fd7 | 962 | if (doingdirectory) { |
a5390dce SL |
963 | if (--xp->i_nlink != 0) |
964 | panic("rename: linked directory"); | |
4f083fd7 | 965 | itrunc(xp, (u_long)0); |
a5390dce | 966 | } |
4f083fd7 SL |
967 | xp->i_flag |= ICHG; |
968 | iput(xp); | |
31db12cb | 969 | xp = NULL; |
4f083fd7 SL |
970 | } |
971 | ||
972 | /* | |
973 | * 3) Unlink the source. | |
974 | */ | |
715baff1 KM |
975 | ndp->ni_nameiop = DELETE | LOCKPARENT; |
976 | ndp->ni_segflg = UIO_USERSPACE; | |
977 | ndp->ni_dirp = uap->from; | |
978 | zp = namei(ndp); | |
979 | dp = ndp->ni_pdir; | |
4f083fd7 SL |
980 | /* |
981 | * Insure directory entry still exists and | |
982 | * has not changed since the start of all | |
983 | * this. If either has occured, forget about | |
85792f12 | 984 | * about deleting the original entry. |
4f083fd7 | 985 | */ |
963fd9f8 | 986 | if (dp != NULL && zp == ip) { |
4f083fd7 SL |
987 | /* |
988 | * If source is a directory, must adjust | |
989 | * link count of parent directory also. | |
990 | * If target didn't exist and source and | |
991 | * target have the same parent, then we | |
992 | * needn't touch the link count, it all | |
993 | * balances out in the end. Otherwise, we | |
994 | * must do so to reflect deletion of ".." | |
995 | * done above. | |
996 | */ | |
997 | if (doingdirectory && (xp != NULL || parentdifferent)) { | |
998 | dp->i_nlink--; | |
999 | dp->i_flag |= ICHG; | |
1000 | } | |
715baff1 | 1001 | if (dirremove(ndp)) { |
963fd9f8 KM |
1002 | zp->i_nlink--; |
1003 | zp->i_flag |= ICHG; | |
4f083fd7 | 1004 | } |
a5390dce SL |
1005 | if (error == 0) /* conservative */ |
1006 | error = u.u_error; | |
4f083fd7 | 1007 | } |
963fd9f8 KM |
1008 | if (zp != NULL) |
1009 | iput(zp); | |
4f083fd7 SL |
1010 | irele(ip); |
1011 | if (dp) | |
1012 | iput(dp); | |
1013 | ||
1014 | /* | |
1015 | * 4) Renaming a directory with the parent | |
1016 | * different requires ".." to be rewritten. | |
1017 | * The window is still there for ".." to | |
1018 | * be inconsistent, but this is unavoidable, | |
1019 | * and a lot shorter than when it was done | |
1020 | * in a user process. | |
1021 | */ | |
a5390dce | 1022 | if (doingdirectory && parentdifferent && error == 0) { |
4f083fd7 | 1023 | struct dirtemplate dirbuf; |
528f664c | 1024 | |
715baff1 KM |
1025 | ndp->ni_nameiop = LOOKUP | LOCKPARENT; |
1026 | ndp->ni_segflg = UIO_USERSPACE; | |
1027 | ndp->ni_dirp = uap->to; | |
1028 | ip = namei(ndp); | |
4f083fd7 SL |
1029 | if (ip == NULL) { |
1030 | printf("rename: .. went away\n"); | |
1031 | return; | |
1032 | } | |
715baff1 | 1033 | dp = ndp->ni_pdir; |
4f083fd7 SL |
1034 | if ((ip->i_mode&IFMT) != IFDIR) { |
1035 | printf("rename: .. not a directory\n"); | |
1036 | goto stuck; | |
1037 | } | |
a5390dce | 1038 | error = rdwri(UIO_READ, ip, (caddr_t)&dirbuf, |
4f083fd7 | 1039 | sizeof (struct dirtemplate), (off_t)0, 1, (int *)0); |
a5390dce | 1040 | if (error == 0) { |
4f083fd7 | 1041 | dirbuf.dotdot_ino = dp->i_number; |
1d00c1cf | 1042 | cacheinval(dp); |
4f083fd7 SL |
1043 | (void) rdwri(UIO_WRITE, ip, (caddr_t)&dirbuf, |
1044 | sizeof (struct dirtemplate), (off_t)0, 1, (int *)0); | |
1045 | } | |
1046 | stuck: | |
1047 | irele(dp); | |
1048 | iput(ip); | |
1049 | } | |
a5390dce SL |
1050 | goto done; |
1051 | ||
4f083fd7 | 1052 | bad: |
31db12cb | 1053 | iput(dp); |
4f083fd7 SL |
1054 | bad1: |
1055 | if (xp) | |
31db12cb | 1056 | iput(xp); |
4f083fd7 SL |
1057 | out: |
1058 | ip->i_nlink--; | |
1059 | ip->i_flag |= ICHG; | |
1060 | irele(ip); | |
a5390dce SL |
1061 | done: |
1062 | if (error) | |
1063 | u.u_error = error; | |
528f664c SL |
1064 | } |
1065 | ||
64d3a787 BJ |
1066 | /* |
1067 | * Make a new file. | |
1068 | */ | |
1069 | struct inode * | |
715baff1 | 1070 | maknode(mode, ndp) |
64d3a787 | 1071 | int mode; |
715baff1 | 1072 | register struct nameidata *ndp; |
64d3a787 BJ |
1073 | { |
1074 | register struct inode *ip; | |
715baff1 | 1075 | register struct inode *pdir = ndp->ni_pdir; |
64d3a787 BJ |
1076 | ino_t ipref; |
1077 | ||
1078 | if ((mode & IFMT) == IFDIR) | |
715baff1 | 1079 | ipref = dirpref(pdir->i_fs); |
64d3a787 | 1080 | else |
715baff1 KM |
1081 | ipref = pdir->i_number; |
1082 | ip = ialloc(pdir, ipref, mode); | |
64d3a787 | 1083 | if (ip == NULL) { |
715baff1 | 1084 | iput(pdir); |
528f664c | 1085 | return (NULL); |
64d3a787 | 1086 | } |
528f664c | 1087 | #ifdef QUOTA |
64d3a787 BJ |
1088 | if (ip->i_dquot != NODQUOT) |
1089 | panic("maknode: dquot"); | |
1090 | #endif | |
1091 | ip->i_flag |= IACC|IUPD|ICHG; | |
1092 | if ((mode & IFMT) == 0) | |
1093 | mode |= IFREG; | |
1094 | ip->i_mode = mode & ~u.u_cmask; | |
1095 | ip->i_nlink = 1; | |
1096 | ip->i_uid = u.u_uid; | |
715baff1 | 1097 | ip->i_gid = pdir->i_gid; |
bb1b75f4 SL |
1098 | if (ip->i_mode & ISGID && !groupmember(ip->i_gid)) |
1099 | ip->i_mode &= ~ISGID; | |
528f664c | 1100 | #ifdef QUOTA |
64d3a787 BJ |
1101 | ip->i_dquot = inoquota(ip); |
1102 | #endif | |
1103 | ||
1104 | /* | |
1105 | * Make sure inode goes to disk before directory entry. | |
1106 | */ | |
3fd23f5c | 1107 | iupdat(ip, &time, &time, 1); |
715baff1 | 1108 | u.u_error = direnter(ip, ndp); |
64d3a787 BJ |
1109 | if (u.u_error) { |
1110 | /* | |
f2a5ad78 SL |
1111 | * Write error occurred trying to update directory |
1112 | * so must deallocate the inode. | |
64d3a787 BJ |
1113 | */ |
1114 | ip->i_nlink = 0; | |
1115 | ip->i_flag |= ICHG; | |
1116 | iput(ip); | |
528f664c | 1117 | return (NULL); |
64d3a787 | 1118 | } |
528f664c | 1119 | return (ip); |
64d3a787 | 1120 | } |
88a7a62a SL |
1121 | |
1122 | /* | |
1123 | * A virgin directory (no blushing please). | |
1124 | */ | |
1125 | struct dirtemplate mastertemplate = { | |
1126 | 0, 12, 1, ".", | |
1127 | 0, DIRBLKSIZ - 12, 2, ".." | |
1128 | }; | |
1129 | ||
1130 | /* | |
1131 | * Mkdir system call | |
1132 | */ | |
1133 | mkdir() | |
1134 | { | |
1135 | struct a { | |
1136 | char *name; | |
1137 | int dmode; | |
715baff1 | 1138 | } *uap = (struct a *)u.u_ap; |
88a7a62a SL |
1139 | register struct inode *ip, *dp; |
1140 | struct dirtemplate dirtemplate; | |
715baff1 | 1141 | register struct nameidata *ndp = &u.u_nd; |
88a7a62a | 1142 | |
715baff1 KM |
1143 | ndp->ni_nameiop = CREATE; |
1144 | ndp->ni_segflg = UIO_USERSPACE; | |
1145 | ndp->ni_dirp = uap->name; | |
1146 | ip = namei(ndp); | |
88a7a62a SL |
1147 | if (u.u_error) |
1148 | return; | |
1149 | if (ip != NULL) { | |
1150 | iput(ip); | |
1151 | u.u_error = EEXIST; | |
1152 | return; | |
1153 | } | |
715baff1 | 1154 | dp = ndp->ni_pdir; |
88a7a62a SL |
1155 | uap->dmode &= 0777; |
1156 | uap->dmode |= IFDIR; | |
1157 | /* | |
1158 | * Must simulate part of maknode here | |
1159 | * in order to acquire the inode, but | |
1160 | * not have it entered in the parent | |
1161 | * directory. The entry is made later | |
1162 | * after writing "." and ".." entries out. | |
1163 | */ | |
1164 | ip = ialloc(dp, dirpref(dp->i_fs), uap->dmode); | |
1165 | if (ip == NULL) { | |
1166 | iput(dp); | |
1167 | return; | |
1168 | } | |
1169 | #ifdef QUOTA | |
1170 | if (ip->i_dquot != NODQUOT) | |
1171 | panic("mkdir: dquot"); | |
1172 | #endif | |
1173 | ip->i_flag |= IACC|IUPD|ICHG; | |
1174 | ip->i_mode = uap->dmode & ~u.u_cmask; | |
1175 | ip->i_nlink = 2; | |
1176 | ip->i_uid = u.u_uid; | |
1177 | ip->i_gid = dp->i_gid; | |
1178 | #ifdef QUOTA | |
1179 | ip->i_dquot = inoquota(ip); | |
1180 | #endif | |
1181 | iupdat(ip, &time, &time, 1); | |
1182 | ||
1183 | /* | |
1184 | * Bump link count in parent directory | |
1185 | * to reflect work done below. Should | |
1186 | * be done before reference is created | |
1187 | * so reparation is possible if we crash. | |
1188 | */ | |
1189 | dp->i_nlink++; | |
1190 | dp->i_flag |= ICHG; | |
1191 | iupdat(dp, &time, &time, 1); | |
1192 | ||
1193 | /* | |
1194 | * Initialize directory with "." | |
1195 | * and ".." from static template. | |
1196 | */ | |
1197 | dirtemplate = mastertemplate; | |
1198 | dirtemplate.dot_ino = ip->i_number; | |
1199 | dirtemplate.dotdot_ino = dp->i_number; | |
1200 | u.u_error = rdwri(UIO_WRITE, ip, (caddr_t)&dirtemplate, | |
1201 | sizeof (dirtemplate), (off_t)0, 1, (int *)0); | |
1202 | if (u.u_error) { | |
1203 | dp->i_nlink--; | |
1204 | dp->i_flag |= ICHG; | |
1205 | goto bad; | |
1206 | } | |
1207 | /* | |
1208 | * Directory all set up, now | |
1209 | * install the entry for it in | |
1210 | * the parent directory. | |
1211 | */ | |
715baff1 | 1212 | u.u_error = direnter(ip, ndp); |
88a7a62a SL |
1213 | dp = NULL; |
1214 | if (u.u_error) { | |
715baff1 KM |
1215 | ndp->ni_nameiop = LOOKUP | NOCACHE; |
1216 | ndp->ni_segflg = UIO_USERSPACE; | |
1217 | ndp->ni_dirp = uap->name; | |
1218 | dp = namei(ndp); | |
88a7a62a SL |
1219 | if (dp) { |
1220 | dp->i_nlink--; | |
1221 | dp->i_flag |= ICHG; | |
1222 | } | |
1223 | } | |
1224 | bad: | |
1225 | /* | |
1226 | * No need to do an explicit itrunc here, | |
1227 | * irele will do this for us because we set | |
1228 | * the link count to 0. | |
1229 | */ | |
1230 | if (u.u_error) { | |
1231 | ip->i_nlink = 0; | |
1232 | ip->i_flag |= ICHG; | |
1233 | } | |
1234 | if (dp) | |
1235 | iput(dp); | |
1236 | iput(ip); | |
1237 | } | |
1238 | ||
1239 | /* | |
1240 | * Rmdir system call. | |
1241 | */ | |
1242 | rmdir() | |
1243 | { | |
1244 | struct a { | |
1245 | char *name; | |
715baff1 | 1246 | } *uap = (struct a *)u.u_ap; |
88a7a62a | 1247 | register struct inode *ip, *dp; |
715baff1 | 1248 | register struct nameidata *ndp = &u.u_nd; |
88a7a62a | 1249 | |
715baff1 KM |
1250 | ndp->ni_nameiop = DELETE | LOCKPARENT; |
1251 | ndp->ni_segflg = UIO_USERSPACE; | |
1252 | ndp->ni_dirp = uap->name; | |
1253 | ip = namei(ndp); | |
88a7a62a SL |
1254 | if (ip == NULL) |
1255 | return; | |
715baff1 | 1256 | dp = ndp->ni_pdir; |
88a7a62a SL |
1257 | /* |
1258 | * No rmdir "." please. | |
1259 | */ | |
1260 | if (dp == ip) { | |
1261 | irele(dp); | |
1262 | iput(ip); | |
1263 | u.u_error = EINVAL; | |
1264 | return; | |
1265 | } | |
1266 | if ((ip->i_mode&IFMT) != IFDIR) { | |
1267 | u.u_error = ENOTDIR; | |
1268 | goto out; | |
1269 | } | |
1270 | /* | |
1271 | * Don't remove a mounted on directory. | |
1272 | */ | |
1273 | if (ip->i_dev != dp->i_dev) { | |
1274 | u.u_error = EBUSY; | |
1275 | goto out; | |
1276 | } | |
1277 | /* | |
1278 | * Verify the directory is empty (and valid). | |
1279 | * (Rmdir ".." won't be valid since | |
1280 | * ".." will contain a reference to | |
1281 | * the current directory and thus be | |
1282 | * non-empty.) | |
1283 | */ | |
1284 | if (ip->i_nlink != 2 || !dirempty(ip)) { | |
1285 | u.u_error = ENOTEMPTY; | |
1286 | goto out; | |
1287 | } | |
1288 | /* | |
1289 | * Delete reference to directory before purging | |
1290 | * inode. If we crash in between, the directory | |
1291 | * will be reattached to lost+found, | |
1292 | */ | |
715baff1 | 1293 | if (dirremove(ndp) == 0) |
88a7a62a SL |
1294 | goto out; |
1295 | dp->i_nlink--; | |
1296 | dp->i_flag |= ICHG; | |
1297 | iput(dp); | |
1298 | dp = NULL; | |
1299 | /* | |
1300 | * Truncate inode. The only stuff left | |
1301 | * in the directory is "." and "..". The | |
1302 | * "." reference is inconsequential since | |
1303 | * we're quashing it. The ".." reference | |
1304 | * has already been adjusted above. We've | |
1305 | * removed the "." reference and the reference | |
1306 | * in the parent directory, but there may be | |
1307 | * other hard links so decrement by 2 and | |
1308 | * worry about them later. | |
1309 | */ | |
1310 | ip->i_nlink -= 2; | |
1311 | itrunc(ip, (u_long)0); | |
1d00c1cf | 1312 | cacheinval(ip); |
88a7a62a SL |
1313 | out: |
1314 | if (dp) | |
1315 | iput(dp); | |
1316 | iput(ip); | |
1317 | } | |
1318 | ||
1319 | struct file * | |
1320 | getinode(fdes) | |
1321 | int fdes; | |
1322 | { | |
8462a185 | 1323 | struct file *fp; |
88a7a62a | 1324 | |
8462a185 SL |
1325 | if ((unsigned)fdes >= NOFILE || (fp = u.u_ofile[fdes]) == NULL) { |
1326 | u.u_error = EBADF; | |
1327 | return ((struct file *)0); | |
1328 | } | |
88a7a62a SL |
1329 | if (fp->f_type != DTYPE_INODE) { |
1330 | u.u_error = EINVAL; | |
8462a185 | 1331 | return ((struct file *)0); |
88a7a62a SL |
1332 | } |
1333 | return (fp); | |
1334 | } | |
1335 | ||
1336 | /* | |
1337 | * mode mask for creation of files | |
1338 | */ | |
1339 | umask() | |
1340 | { | |
1341 | register struct a { | |
1342 | int mask; | |
715baff1 | 1343 | } *uap = (struct a *)u.u_ap; |
88a7a62a | 1344 | |
88a7a62a SL |
1345 | u.u_r.r_val1 = u.u_cmask; |
1346 | u.u_cmask = uap->mask & 07777; | |
1347 | } |