Commit | Line | Data |
---|---|---|
696ccec7 | 1 | /* lfs_vnops.c 6.17 85/03/19 */ |
6459ebe0 | 2 | |
94368568 JB |
3 | #include "param.h" |
4 | #include "systm.h" | |
5 | #include "dir.h" | |
6 | #include "user.h" | |
7 | #include "kernel.h" | |
8 | #include "file.h" | |
9 | #include "stat.h" | |
10 | #include "inode.h" | |
11 | #include "fs.h" | |
12 | #include "buf.h" | |
13 | #include "proc.h" | |
14 | #include "quota.h" | |
15 | #include "uio.h" | |
16 | #include "socket.h" | |
17 | #include "socketvar.h" | |
18 | #include "mount.h" | |
88a7a62a SL |
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) { |
696ccec7 KM |
127 | if (mode & FEXCL) |
128 | ndp->ni_nameiop = CREATE; | |
129 | else | |
130 | ndp->ni_nameiop = CREATE | FOLLOW; | |
715baff1 | 131 | ip = namei(ndp); |
88a7a62a SL |
132 | if (ip == NULL) { |
133 | if (u.u_error) | |
134 | return; | |
715baff1 | 135 | ip = maknode(arg&07777&(~ISVTX), ndp); |
88a7a62a SL |
136 | if (ip == NULL) |
137 | return; | |
138 | mode &= ~FTRUNC; | |
139 | } else { | |
140 | if (mode&FEXCL) { | |
141 | u.u_error = EEXIST; | |
142 | iput(ip); | |
143 | return; | |
144 | } | |
145 | mode &= ~FCREAT; | |
146 | } | |
147 | } else { | |
715baff1 KM |
148 | ndp->ni_nameiop = LOOKUP | FOLLOW; |
149 | ip = namei(ndp); | |
88a7a62a SL |
150 | if (ip == NULL) |
151 | return; | |
152 | } | |
153 | if ((ip->i_mode & IFMT) == IFSOCK) { | |
154 | u.u_error = EOPNOTSUPP; | |
155 | goto bad; | |
156 | } | |
157 | if ((mode&FCREAT) == 0) { | |
3e78e260 | 158 | if (mode&FREAD) |
528f664c SL |
159 | if (access(ip, IREAD)) |
160 | goto bad; | |
09bf91df | 161 | if (mode&(FWRITE|FTRUNC)) { |
528f664c SL |
162 | if (access(ip, IWRITE)) |
163 | goto bad; | |
164 | if ((ip->i_mode&IFMT) == IFDIR) { | |
3e78e260 | 165 | u.u_error = EISDIR; |
528f664c SL |
166 | goto bad; |
167 | } | |
3e78e260 BJ |
168 | } |
169 | } | |
88a7a62a SL |
170 | fp = falloc(); |
171 | if (fp == NULL) | |
172 | goto bad; | |
173 | if (mode&FTRUNC) | |
4f083fd7 | 174 | itrunc(ip, (u_long)0); |
a388503d | 175 | IUNLOCK(ip); |
88a7a62a SL |
176 | fp->f_flag = mode&FMASK; |
177 | fp->f_type = DTYPE_INODE; | |
178 | fp->f_ops = &inodeops; | |
179 | fp->f_data = (caddr_t)ip; | |
3e78e260 | 180 | i = u.u_r.r_val1; |
88a7a62a SL |
181 | if (setjmp(&u.u_qsave)) { |
182 | if (u.u_error == 0) | |
183 | u.u_error = EINTR; | |
184 | u.u_ofile[i] = NULL; | |
185 | closef(fp); | |
3e78e260 | 186 | return; |
528f664c | 187 | } |
88a7a62a SL |
188 | u.u_error = openi(ip, mode); |
189 | if (u.u_error == 0) | |
190 | return; | |
3e78e260 BJ |
191 | u.u_ofile[i] = NULL; |
192 | fp->f_count--; | |
8eee8525 | 193 | irele(ip); |
528f664c SL |
194 | return; |
195 | bad: | |
196 | iput(ip); | |
3e78e260 BJ |
197 | } |
198 | ||
199 | /* | |
200 | * Mknod system call | |
201 | */ | |
202 | mknod() | |
203 | { | |
204 | register struct inode *ip; | |
205 | register struct a { | |
206 | char *fname; | |
207 | int fmode; | |
208 | int dev; | |
715baff1 KM |
209 | } *uap = (struct a *)u.u_ap; |
210 | register struct nameidata *ndp = &u.u_nd; | |
3e78e260 | 211 | |
88a7a62a SL |
212 | if (!suser()) |
213 | return; | |
715baff1 KM |
214 | ndp->ni_nameiop = CREATE; |
215 | ndp->ni_segflg = UIO_USERSPACE; | |
216 | ndp->ni_dirp = uap->fname; | |
217 | ip = namei(ndp); | |
88a7a62a SL |
218 | if (ip != NULL) { |
219 | u.u_error = EEXIST; | |
220 | goto out; | |
3e78e260 BJ |
221 | } |
222 | if (u.u_error) | |
223 | return; | |
715baff1 | 224 | ip = maknode(uap->fmode, ndp); |
3e78e260 BJ |
225 | if (ip == NULL) |
226 | return; | |
88a7a62a SL |
227 | switch (ip->i_mode & IFMT) { |
228 | ||
7bfaea72 | 229 | case IFMT: /* used by badsect to flag bad sectors */ |
88a7a62a SL |
230 | case IFCHR: |
231 | case IFBLK: | |
232 | if (uap->dev) { | |
233 | /* | |
234 | * Want to be able to use this to make badblock | |
235 | * inodes, so don't truncate the dev number. | |
236 | */ | |
237 | ip->i_rdev = uap->dev; | |
238 | ip->i_flag |= IACC|IUPD|ICHG; | |
239 | } | |
3e78e260 BJ |
240 | } |
241 | ||
242 | out: | |
243 | iput(ip); | |
244 | } | |
245 | ||
246 | /* | |
247 | * link system call | |
248 | */ | |
249 | link() | |
250 | { | |
251 | register struct inode *ip, *xp; | |
252 | register struct a { | |
253 | char *target; | |
254 | char *linkname; | |
715baff1 KM |
255 | } *uap = (struct a *)u.u_ap; |
256 | register struct nameidata *ndp = &u.u_nd; | |
3e78e260 | 257 | |
715baff1 KM |
258 | ndp->ni_nameiop = LOOKUP | FOLLOW; |
259 | ndp->ni_segflg = UIO_USERSPACE; | |
260 | ndp->ni_dirp = uap->target; | |
261 | ip = namei(ndp); /* well, this routine is doomed anyhow */ | |
3e78e260 BJ |
262 | if (ip == NULL) |
263 | return; | |
4f083fd7 | 264 | if ((ip->i_mode&IFMT) == IFDIR && !suser()) { |
f94ceb3b BJ |
265 | iput(ip); |
266 | return; | |
267 | } | |
3e78e260 BJ |
268 | ip->i_nlink++; |
269 | ip->i_flag |= ICHG; | |
3fd23f5c | 270 | iupdat(ip, &time, &time, 1); |
a388503d | 271 | IUNLOCK(ip); |
715baff1 KM |
272 | ndp->ni_nameiop = CREATE; |
273 | ndp->ni_segflg = UIO_USERSPACE; | |
274 | ndp->ni_dirp = (caddr_t)uap->linkname; | |
275 | xp = namei(ndp); | |
3e78e260 BJ |
276 | if (xp != NULL) { |
277 | u.u_error = EEXIST; | |
278 | iput(xp); | |
279 | goto out; | |
280 | } | |
281 | if (u.u_error) | |
282 | goto out; | |
715baff1 KM |
283 | if (ndp->ni_pdir->i_dev != ip->i_dev) { |
284 | iput(ndp->ni_pdir); | |
3e78e260 BJ |
285 | u.u_error = EXDEV; |
286 | goto out; | |
287 | } | |
715baff1 | 288 | u.u_error = direnter(ip, ndp); |
3e78e260 BJ |
289 | out: |
290 | if (u.u_error) { | |
291 | ip->i_nlink--; | |
292 | ip->i_flag |= ICHG; | |
293 | } | |
8eee8525 | 294 | irele(ip); |
3e78e260 BJ |
295 | } |
296 | ||
297 | /* | |
298 | * symlink -- make a symbolic link | |
299 | */ | |
300 | symlink() | |
301 | { | |
302 | register struct a { | |
303 | char *target; | |
304 | char *linkname; | |
715baff1 | 305 | } *uap = (struct a *)u.u_ap; |
3e78e260 BJ |
306 | register struct inode *ip; |
307 | register char *tp; | |
308 | register c, nc; | |
715baff1 | 309 | register struct nameidata *ndp = &u.u_nd; |
3e78e260 | 310 | |
3e78e260 BJ |
311 | tp = uap->target; |
312 | nc = 0; | |
313 | while (c = fubyte(tp)) { | |
314 | if (c < 0) { | |
315 | u.u_error = EFAULT; | |
316 | return; | |
317 | } | |
318 | tp++; | |
319 | nc++; | |
320 | } | |
715baff1 KM |
321 | ndp->ni_nameiop = CREATE; |
322 | ndp->ni_segflg = UIO_USERSPACE; | |
323 | ndp->ni_dirp = uap->linkname; | |
324 | ip = namei(ndp); | |
3e78e260 BJ |
325 | if (ip) { |
326 | iput(ip); | |
327 | u.u_error = EEXIST; | |
328 | return; | |
329 | } | |
330 | if (u.u_error) | |
331 | return; | |
715baff1 | 332 | ip = maknode(IFLNK | 0777, ndp); |
3e78e260 BJ |
333 | if (ip == NULL) |
334 | return; | |
31949305 | 335 | u.u_error = rdwri(UIO_WRITE, ip, uap->target, nc, 0, 0, (int *)0); |
4f083fd7 | 336 | /* handle u.u_error != 0 */ |
3e78e260 BJ |
337 | iput(ip); |
338 | } | |
339 | ||
340 | /* | |
341 | * Unlink system call. | |
342 | * Hard to avoid races here, especially | |
343 | * in unlinking directories. | |
344 | */ | |
345 | unlink() | |
346 | { | |
3e78e260 BJ |
347 | struct a { |
348 | char *fname; | |
715baff1 | 349 | } *uap = (struct a *)u.u_ap; |
4f083fd7 | 350 | register struct inode *ip, *dp; |
715baff1 | 351 | register struct nameidata *ndp = &u.u_nd; |
3e78e260 | 352 | |
715baff1 KM |
353 | ndp->ni_nameiop = DELETE | LOCKPARENT; |
354 | ndp->ni_segflg = UIO_USERSPACE; | |
355 | ndp->ni_dirp = uap->fname; | |
356 | ip = namei(ndp); | |
4f083fd7 | 357 | if (ip == NULL) |
3e78e260 | 358 | return; |
715baff1 | 359 | dp = ndp->ni_pdir; |
4f083fd7 | 360 | if ((ip->i_mode&IFMT) == IFDIR && !suser()) |
3e78e260 BJ |
361 | goto out; |
362 | /* | |
363 | * Don't unlink a mounted file. | |
364 | */ | |
4f083fd7 | 365 | if (ip->i_dev != dp->i_dev) { |
3e78e260 BJ |
366 | u.u_error = EBUSY; |
367 | goto out; | |
368 | } | |
369 | if (ip->i_flag&ITEXT) | |
370 | xrele(ip); /* try once to free text */ | |
715baff1 | 371 | if (dirremove(ndp)) { |
64d3a787 BJ |
372 | ip->i_nlink--; |
373 | ip->i_flag |= ICHG; | |
6459ebe0 | 374 | } |
3e78e260 | 375 | out: |
4f083fd7 | 376 | if (dp == ip) |
8eee8525 KM |
377 | irele(ip); |
378 | else | |
379 | iput(ip); | |
4f083fd7 | 380 | iput(dp); |
3e78e260 BJ |
381 | } |
382 | ||
383 | /* | |
384 | * Seek system call | |
385 | */ | |
35e7c31a | 386 | lseek() |
3e78e260 BJ |
387 | { |
388 | register struct file *fp; | |
389 | register struct a { | |
528f664c | 390 | int fd; |
3e78e260 BJ |
391 | off_t off; |
392 | int sbase; | |
715baff1 | 393 | } *uap = (struct a *)u.u_ap; |
3e78e260 | 394 | |
8462a185 SL |
395 | GETF(fp, uap->fd); |
396 | if (fp->f_type != DTYPE_INODE) { | |
397 | u.u_error = ESPIPE; | |
3e78e260 | 398 | return; |
8462a185 | 399 | } |
b4d1aee9 SL |
400 | switch (uap->sbase) { |
401 | ||
402 | case L_INCR: | |
403 | fp->f_offset += uap->off; | |
404 | break; | |
405 | ||
406 | case L_XTND: | |
407 | fp->f_offset = uap->off + ((struct inode *)fp->f_data)->i_size; | |
408 | break; | |
409 | ||
410 | case L_SET: | |
411 | fp->f_offset = uap->off; | |
412 | break; | |
413 | ||
414 | default: | |
415 | u.u_error = EINVAL; | |
416 | return; | |
417 | } | |
418 | u.u_r.r_off = fp->f_offset; | |
3e78e260 BJ |
419 | } |
420 | ||
421 | /* | |
422 | * Access system call | |
423 | */ | |
424 | saccess() | |
425 | { | |
426 | register svuid, svgid; | |
427 | register struct inode *ip; | |
428 | register struct a { | |
429 | char *fname; | |
430 | int fmode; | |
715baff1 KM |
431 | } *uap = (struct a *)u.u_ap; |
432 | register struct nameidata *ndp = &u.u_nd; | |
3e78e260 | 433 | |
3e78e260 BJ |
434 | svuid = u.u_uid; |
435 | svgid = u.u_gid; | |
436 | u.u_uid = u.u_ruid; | |
437 | u.u_gid = u.u_rgid; | |
715baff1 KM |
438 | ndp->ni_nameiop = LOOKUP | FOLLOW; |
439 | ndp->ni_segflg = UIO_USERSPACE; | |
440 | ndp->ni_dirp = uap->fname; | |
441 | ip = namei(ndp); | |
3e78e260 | 442 | if (ip != NULL) { |
88a7a62a | 443 | if ((uap->fmode&R_OK) && access(ip, IREAD)) |
528f664c | 444 | goto done; |
88a7a62a | 445 | if ((uap->fmode&W_OK) && access(ip, IWRITE)) |
528f664c | 446 | goto done; |
88a7a62a | 447 | if ((uap->fmode&X_OK) && access(ip, IEXEC)) |
528f664c SL |
448 | goto done; |
449 | done: | |
3e78e260 BJ |
450 | iput(ip); |
451 | } | |
452 | u.u_uid = svuid; | |
453 | u.u_gid = svgid; | |
454 | } | |
d67a03eb | 455 | |
d67a03eb | 456 | /* |
6459ebe0 | 457 | * Stat system call. This version follows links. |
d67a03eb BJ |
458 | */ |
459 | stat() | |
460 | { | |
d67a03eb | 461 | |
715baff1 | 462 | stat1(FOLLOW); |
d67a03eb BJ |
463 | } |
464 | ||
5485e062 | 465 | /* |
6459ebe0 | 466 | * Lstat system call. This version does not follow links. |
5485e062 BJ |
467 | */ |
468 | lstat() | |
88a7a62a SL |
469 | { |
470 | ||
715baff1 | 471 | stat1(NOFOLLOW); |
88a7a62a SL |
472 | } |
473 | ||
474 | stat1(follow) | |
475 | int follow; | |
5485e062 BJ |
476 | { |
477 | register struct inode *ip; | |
478 | register struct a { | |
479 | char *fname; | |
88a7a62a | 480 | struct stat *ub; |
715baff1 | 481 | } *uap = (struct a *)u.u_ap; |
88a7a62a | 482 | struct stat sb; |
715baff1 | 483 | register struct nameidata *ndp = &u.u_nd; |
5485e062 | 484 | |
715baff1 KM |
485 | ndp->ni_nameiop = LOOKUP | follow; |
486 | ndp->ni_segflg = UIO_USERSPACE; | |
487 | ndp->ni_dirp = uap->fname; | |
488 | ip = namei(ndp); | |
5485e062 BJ |
489 | if (ip == NULL) |
490 | return; | |
0eaf24e3 | 491 | (void) ino_stat(ip, &sb); |
5485e062 | 492 | iput(ip); |
88a7a62a | 493 | u.u_error = copyout((caddr_t)&sb, (caddr_t)uap->ub, sizeof (sb)); |
d67a03eb BJ |
494 | } |
495 | ||
496 | /* | |
5485e062 BJ |
497 | * Return target name of a symbolic link |
498 | */ | |
499 | readlink() | |
500 | { | |
501 | register struct inode *ip; | |
502 | register struct a { | |
503 | char *name; | |
504 | char *buf; | |
505 | int count; | |
31949305 | 506 | } *uap = (struct a *)u.u_ap; |
715baff1 | 507 | register struct nameidata *ndp = &u.u_nd; |
31949305 | 508 | int resid; |
5485e062 | 509 | |
715baff1 KM |
510 | ndp->ni_nameiop = LOOKUP; |
511 | ndp->ni_segflg = UIO_USERSPACE; | |
512 | ndp->ni_dirp = uap->name; | |
513 | ip = namei(ndp); | |
5485e062 BJ |
514 | if (ip == NULL) |
515 | return; | |
516 | if ((ip->i_mode&IFMT) != IFLNK) { | |
517 | u.u_error = ENXIO; | |
518 | goto out; | |
519 | } | |
31949305 | 520 | u.u_error = rdwri(UIO_READ, ip, uap->buf, uap->count, 0, 0, &resid); |
5485e062 BJ |
521 | out: |
522 | iput(ip); | |
31949305 | 523 | u.u_r.r_val1 = uap->count - resid; |
5485e062 BJ |
524 | } |
525 | ||
4f083fd7 SL |
526 | /* |
527 | * Change mode of a file given path name. | |
528 | */ | |
3e78e260 | 529 | chmod() |
5485e062 | 530 | { |
528f664c SL |
531 | struct inode *ip; |
532 | struct a { | |
3e78e260 BJ |
533 | char *fname; |
534 | int fmode; | |
715baff1 | 535 | } *uap = (struct a *)u.u_ap; |
5485e062 | 536 | |
715baff1 | 537 | if ((ip = owner(uap->fname, FOLLOW)) == NULL) |
5485e062 | 538 | return; |
528f664c | 539 | chmod1(ip, uap->fmode); |
4f083fd7 | 540 | iput(ip); |
528f664c | 541 | } |
f94ceb3b | 542 | |
4f083fd7 SL |
543 | /* |
544 | * Change mode of a file given a file descriptor. | |
545 | */ | |
528f664c SL |
546 | fchmod() |
547 | { | |
548 | struct a { | |
549 | int fd; | |
550 | int fmode; | |
715baff1 | 551 | } *uap = (struct a *)u.u_ap; |
528f664c SL |
552 | register struct inode *ip; |
553 | register struct file *fp; | |
554 | ||
88a7a62a | 555 | fp = getinode(uap->fd); |
528f664c SL |
556 | if (fp == NULL) |
557 | return; | |
88a7a62a | 558 | ip = (struct inode *)fp->f_data; |
4f083fd7 | 559 | if (u.u_uid != ip->i_uid && !suser()) |
528f664c | 560 | return; |
a388503d | 561 | ILOCK(ip); |
528f664c | 562 | chmod1(ip, uap->fmode); |
a388503d | 563 | IUNLOCK(ip); |
528f664c SL |
564 | } |
565 | ||
4f083fd7 SL |
566 | /* |
567 | * Change the mode on a file. | |
568 | * Inode must be locked before calling. | |
569 | */ | |
528f664c SL |
570 | chmod1(ip, mode) |
571 | register struct inode *ip; | |
572 | register int mode; | |
573 | { | |
197da11b | 574 | |
3e78e260 | 575 | ip->i_mode &= ~07777; |
f94ceb3b | 576 | if (u.u_uid) { |
528f664c | 577 | mode &= ~ISVTX; |
bb1b75f4 SL |
578 | if (!groupmember(ip->i_gid)) |
579 | mode &= ~ISGID; | |
f94ceb3b | 580 | } |
528f664c | 581 | ip->i_mode |= mode&07777; |
3e78e260 BJ |
582 | ip->i_flag |= ICHG; |
583 | if (ip->i_flag&ITEXT && (ip->i_mode&ISVTX)==0) | |
584 | xrele(ip); | |
5485e062 BJ |
585 | } |
586 | ||
4f083fd7 SL |
587 | /* |
588 | * Set ownership given a path name. | |
589 | */ | |
3e78e260 | 590 | chown() |
d67a03eb | 591 | { |
528f664c SL |
592 | struct inode *ip; |
593 | struct a { | |
3e78e260 BJ |
594 | char *fname; |
595 | int uid; | |
596 | int gid; | |
715baff1 | 597 | } *uap = (struct a *)u.u_ap; |
d67a03eb | 598 | |
715baff1 | 599 | if (!suser() || (ip = owner(uap->fname, NOFOLLOW)) == NULL) |
d67a03eb | 600 | return; |
bb1b75f4 | 601 | u.u_error = chown1(ip, uap->uid, uap->gid); |
4f083fd7 | 602 | iput(ip); |
528f664c | 603 | } |
f94ceb3b | 604 | |
4f083fd7 SL |
605 | /* |
606 | * Set ownership given a file descriptor. | |
607 | */ | |
528f664c SL |
608 | fchown() |
609 | { | |
610 | struct a { | |
611 | int fd; | |
612 | int uid; | |
613 | int gid; | |
715baff1 | 614 | } *uap = (struct a *)u.u_ap; |
528f664c SL |
615 | register struct inode *ip; |
616 | register struct file *fp; | |
617 | ||
88a7a62a | 618 | fp = getinode(uap->fd); |
528f664c SL |
619 | if (fp == NULL) |
620 | return; | |
88a7a62a | 621 | ip = (struct inode *)fp->f_data; |
aad8ef38 | 622 | if (!suser()) |
528f664c | 623 | return; |
a388503d | 624 | ILOCK(ip); |
bb1b75f4 | 625 | u.u_error = chown1(ip, uap->uid, uap->gid); |
a388503d | 626 | IUNLOCK(ip); |
528f664c SL |
627 | } |
628 | ||
629 | /* | |
630 | * Perform chown operation on inode ip; | |
631 | * inode must be locked prior to call. | |
632 | */ | |
633 | chown1(ip, uid, gid) | |
634 | register struct inode *ip; | |
635 | int uid, gid; | |
636 | { | |
637 | #ifdef QUOTA | |
638 | register long change; | |
bb1b75f4 | 639 | #endif |
528f664c | 640 | |
bb1b75f4 SL |
641 | if (uid == -1) |
642 | uid = ip->i_uid; | |
643 | if (gid == -1) | |
644 | gid = ip->i_gid; | |
bb1b75f4 | 645 | #ifdef QUOTA |
3809bf69 | 646 | if (ip->i_uid == uid) /* this just speeds things a little */ |
0a77f278 | 647 | change = 0; |
2e073567 SL |
648 | else |
649 | change = ip->i_blocks; | |
650 | (void) chkdq(ip, -change, 1); | |
651 | (void) chkiq(ip->i_dev, ip, ip->i_uid, 1); | |
0a77f278 | 652 | dqrele(ip->i_dquot); |
f94ceb3b | 653 | #endif |
bb1b75f4 SL |
654 | ip->i_uid = uid; |
655 | ip->i_gid = gid; | |
3e78e260 BJ |
656 | ip->i_flag |= ICHG; |
657 | if (u.u_ruid != 0) | |
658 | ip->i_mode &= ~(ISUID|ISGID); | |
528f664c | 659 | #ifdef QUOTA |
0a77f278 | 660 | ip->i_dquot = inoquota(ip); |
2e073567 SL |
661 | (void) chkdq(ip, change, 1); |
662 | (void) chkiq(ip->i_dev, (struct inode *)NULL, uid, 1); | |
663 | return (u.u_error); /* should == 0 ALWAYS !! */ | |
664 | #else | |
bb1b75f4 | 665 | return (0); |
2e073567 | 666 | #endif |
d67a03eb BJ |
667 | } |
668 | ||
bb1b75f4 SL |
669 | utimes() |
670 | { | |
671 | register struct a { | |
672 | char *fname; | |
673 | struct timeval *tptr; | |
674 | } *uap = (struct a *)u.u_ap; | |
675 | register struct inode *ip; | |
676 | struct timeval tv[2]; | |
677 | ||
715baff1 | 678 | if ((ip = owner(uap->fname, FOLLOW)) == NULL) |
bb1b75f4 SL |
679 | return; |
680 | u.u_error = copyin((caddr_t)uap->tptr, (caddr_t)tv, sizeof (tv)); | |
681 | if (u.u_error == 0) { | |
682 | ip->i_flag |= IACC|IUPD|ICHG; | |
683 | iupdat(ip, &tv[0], &tv[1], 0); | |
684 | } | |
685 | iput(ip); | |
686 | } | |
d67a03eb | 687 | |
4f083fd7 SL |
688 | /* |
689 | * Flush any pending I/O. | |
690 | */ | |
3e78e260 | 691 | sync() |
d67a03eb | 692 | { |
d67a03eb | 693 | |
3fd23f5c | 694 | update(); |
d67a03eb | 695 | } |
64d3a787 | 696 | |
4f083fd7 SL |
697 | /* |
698 | * Truncate a file given its path name. | |
699 | */ | |
528f664c SL |
700 | truncate() |
701 | { | |
702 | struct a { | |
703 | char *fname; | |
4f083fd7 | 704 | u_long length; |
31949305 | 705 | } *uap = (struct a *)u.u_ap; |
528f664c | 706 | struct inode *ip; |
715baff1 | 707 | register struct nameidata *ndp = &u.u_nd; |
528f664c | 708 | |
715baff1 KM |
709 | ndp->ni_nameiop = LOOKUP | FOLLOW; |
710 | ndp->ni_segflg = UIO_USERSPACE; | |
711 | ndp->ni_dirp = uap->fname; | |
712 | ip = namei(ndp); | |
528f664c SL |
713 | if (ip == NULL) |
714 | return; | |
715 | if (access(ip, IWRITE)) | |
716 | goto bad; | |
717 | if ((ip->i_mode&IFMT) == IFDIR) { | |
718 | u.u_error = EISDIR; | |
719 | goto bad; | |
720 | } | |
721 | itrunc(ip, uap->length); | |
528f664c SL |
722 | bad: |
723 | iput(ip); | |
724 | } | |
725 | ||
4f083fd7 SL |
726 | /* |
727 | * Truncate a file given a file descriptor. | |
728 | */ | |
528f664c SL |
729 | ftruncate() |
730 | { | |
731 | struct a { | |
732 | int fd; | |
4f083fd7 | 733 | u_long length; |
31949305 | 734 | } *uap = (struct a *)u.u_ap; |
528f664c SL |
735 | struct inode *ip; |
736 | struct file *fp; | |
737 | ||
88a7a62a | 738 | fp = getinode(uap->fd); |
528f664c SL |
739 | if (fp == NULL) |
740 | return; | |
528f664c SL |
741 | if ((fp->f_flag&FWRITE) == 0) { |
742 | u.u_error = EINVAL; | |
743 | return; | |
744 | } | |
88a7a62a | 745 | ip = (struct inode *)fp->f_data; |
a388503d | 746 | ILOCK(ip); |
528f664c | 747 | itrunc(ip, uap->length); |
a388503d | 748 | IUNLOCK(ip); |
4f083fd7 SL |
749 | } |
750 | ||
751 | /* | |
752 | * Synch an open file. | |
753 | */ | |
754 | fsync() | |
755 | { | |
756 | struct a { | |
757 | int fd; | |
758 | } *uap = (struct a *)u.u_ap; | |
759 | struct inode *ip; | |
760 | struct file *fp; | |
761 | ||
88a7a62a | 762 | fp = getinode(uap->fd); |
4f083fd7 SL |
763 | if (fp == NULL) |
764 | return; | |
88a7a62a | 765 | ip = (struct inode *)fp->f_data; |
a388503d | 766 | ILOCK(ip); |
4f083fd7 | 767 | syncip(ip); |
a388503d | 768 | IUNLOCK(ip); |
528f664c SL |
769 | } |
770 | ||
4f083fd7 SL |
771 | /* |
772 | * Rename system call. | |
773 | * rename("foo", "bar"); | |
774 | * is essentially | |
775 | * unlink("bar"); | |
776 | * link("foo", "bar"); | |
777 | * unlink("foo"); | |
778 | * but ``atomically''. Can't do full commit without saving state in the | |
779 | * inode on disk which isn't feasible at this time. Best we can do is | |
780 | * always guarantee the target exists. | |
781 | * | |
782 | * Basic algorithm is: | |
783 | * | |
784 | * 1) Bump link count on source while we're linking it to the | |
785 | * target. This also insure the inode won't be deleted out | |
68f21562 KM |
786 | * from underneath us while we work (it may be truncated by |
787 | * a concurrent `trunc' or `open' for creation). | |
4f083fd7 SL |
788 | * 2) Link source to destination. If destination already exists, |
789 | * delete it first. | |
68f21562 KM |
790 | * 3) Unlink source reference to inode if still around. If a |
791 | * directory was moved and the parent of the destination | |
4f083fd7 SL |
792 | * is different from the source, patch the ".." entry in the |
793 | * directory. | |
794 | * | |
795 | * Source and destination must either both be directories, or both | |
796 | * not be directories. If target is a directory, it must be empty. | |
797 | */ | |
528f664c SL |
798 | rename() |
799 | { | |
800 | struct a { | |
801 | char *from; | |
802 | char *to; | |
715baff1 | 803 | } *uap = (struct a *)u.u_ap; |
4f083fd7 | 804 | register struct inode *ip, *xp, *dp; |
68f21562 KM |
805 | struct dirtemplate dirbuf; |
806 | int doingdirectory = 0, oldparent = 0, newparent = 0; | |
715baff1 | 807 | register struct nameidata *ndp = &u.u_nd; |
a5390dce | 808 | int error = 0; |
4f083fd7 | 809 | |
715baff1 KM |
810 | ndp->ni_nameiop = DELETE | LOCKPARENT; |
811 | ndp->ni_segflg = UIO_USERSPACE; | |
812 | ndp->ni_dirp = uap->from; | |
813 | ip = namei(ndp); | |
4f083fd7 SL |
814 | if (ip == NULL) |
815 | return; | |
715baff1 | 816 | dp = ndp->ni_pdir; |
4f083fd7 SL |
817 | if ((ip->i_mode&IFMT) == IFDIR) { |
818 | register struct direct *d; | |
819 | ||
715baff1 | 820 | d = &ndp->ni_dent; |
4f083fd7 | 821 | /* |
046f18d1 | 822 | * Avoid ".", "..", and aliases of "." for obvious reasons. |
4f083fd7 | 823 | */ |
046f18d1 SL |
824 | if ((d->d_namlen == 1 && d->d_name[0] == '.') || |
825 | (d->d_namlen == 2 && bcmp(d->d_name, "..", 2) == 0) || | |
68f21562 | 826 | (dp == ip) || (ip->i_flag & IRENAME)) { |
046f18d1 SL |
827 | iput(dp); |
828 | if (dp == ip) | |
829 | irele(ip); | |
830 | else | |
4f083fd7 | 831 | iput(ip); |
046f18d1 SL |
832 | u.u_error = EINVAL; |
833 | return; | |
4f083fd7 | 834 | } |
68f21562 | 835 | ip->i_flag |= IRENAME; |
4f083fd7 SL |
836 | oldparent = dp->i_number; |
837 | doingdirectory++; | |
838 | } | |
046f18d1 | 839 | iput(dp); |
4f083fd7 SL |
840 | |
841 | /* | |
842 | * 1) Bump link count while we're moving stuff | |
843 | * around. If we crash somewhere before | |
844 | * completing our work, the link count | |
845 | * may be wrong, but correctable. | |
846 | */ | |
847 | ip->i_nlink++; | |
848 | ip->i_flag |= ICHG; | |
849 | iupdat(ip, &time, &time, 1); | |
a388503d | 850 | IUNLOCK(ip); |
4f083fd7 SL |
851 | |
852 | /* | |
853 | * When the target exists, both the directory | |
854 | * and target inodes are returned locked. | |
855 | */ | |
715baff1 KM |
856 | ndp->ni_nameiop = CREATE | LOCKPARENT | NOCACHE; |
857 | ndp->ni_dirp = (caddr_t)uap->to; | |
858 | xp = namei(ndp); | |
a5390dce SL |
859 | if (u.u_error) { |
860 | error = u.u_error; | |
4f083fd7 | 861 | goto out; |
a5390dce | 862 | } |
715baff1 | 863 | dp = ndp->ni_pdir; |
046f18d1 SL |
864 | /* |
865 | * If ".." must be changed (ie the directory gets a new | |
81552f0f KM |
866 | * parent) then the source directory must not be in the |
867 | * directory heirarchy above the target, as this would | |
868 | * orphan everything below the source directory. Also | |
869 | * the user must have write permission in the source so | |
870 | * as to be able to change "..". We must repeat the call | |
871 | * to namei, as the parent directory is unlocked by the | |
872 | * call to checkpath(). | |
046f18d1 | 873 | */ |
68f21562 KM |
874 | if (oldparent != dp->i_number) |
875 | newparent = dp->i_number; | |
876 | if (doingdirectory && newparent) { | |
81552f0f KM |
877 | if (access(ip, IWRITE)) |
878 | goto bad; | |
879 | do { | |
715baff1 | 880 | dp = ndp->ni_pdir; |
81552f0f KM |
881 | if (xp != NULL) |
882 | iput(xp); | |
883 | u.u_error = checkpath(ip, dp); | |
884 | if (u.u_error) | |
885 | goto out; | |
715baff1 | 886 | xp = namei(ndp); |
81552f0f KM |
887 | if (u.u_error) { |
888 | error = u.u_error; | |
889 | goto out; | |
890 | } | |
715baff1 | 891 | } while (dp != ndp->ni_pdir); |
81552f0f | 892 | } |
4f083fd7 SL |
893 | /* |
894 | * 2) If target doesn't exist, link the target | |
895 | * to the source and unlink the source. | |
896 | * Otherwise, rewrite the target directory | |
897 | * entry to reference the source inode and | |
898 | * expunge the original entry's existence. | |
899 | */ | |
4f083fd7 SL |
900 | if (xp == NULL) { |
901 | if (dp->i_dev != ip->i_dev) { | |
a5390dce | 902 | error = EXDEV; |
4f083fd7 SL |
903 | goto bad; |
904 | } | |
905 | /* | |
68f21562 KM |
906 | * Account for ".." in new directory. |
907 | * When source and destination have the same | |
908 | * parent we don't fool with the link count. | |
4f083fd7 | 909 | */ |
68f21562 | 910 | if (doingdirectory && newparent) { |
4f083fd7 SL |
911 | dp->i_nlink++; |
912 | dp->i_flag |= ICHG; | |
913 | iupdat(dp, &time, &time, 1); | |
914 | } | |
715baff1 | 915 | error = direnter(ip, ndp); |
f2a5ad78 | 916 | if (error) |
4f083fd7 SL |
917 | goto out; |
918 | } else { | |
919 | if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) { | |
a5390dce | 920 | error = EXDEV; |
4f083fd7 SL |
921 | goto bad; |
922 | } | |
e69c3c9c SL |
923 | /* |
924 | * Short circuit rename(foo, foo). | |
925 | */ | |
926 | if (xp->i_number == ip->i_number) | |
927 | goto bad; | |
4f083fd7 | 928 | /* |
a5390dce SL |
929 | * Target must be empty if a directory |
930 | * and have no links to it. | |
4f083fd7 SL |
931 | * Also, insure source and target are |
932 | * compatible (both directories, or both | |
933 | * not directories). | |
934 | */ | |
935 | if ((xp->i_mode&IFMT) == IFDIR) { | |
68f21562 | 936 | if (!dirempty(xp, dp->i_number) || xp->i_nlink > 2) { |
a5390dce | 937 | error = ENOTEMPTY; |
4f083fd7 SL |
938 | goto bad; |
939 | } | |
940 | if (!doingdirectory) { | |
a5390dce | 941 | error = ENOTDIR; |
4f083fd7 SL |
942 | goto bad; |
943 | } | |
68f21562 | 944 | cacheinval(dp); |
4f083fd7 | 945 | } else if (doingdirectory) { |
a5390dce | 946 | error = EISDIR; |
4f083fd7 SL |
947 | goto bad; |
948 | } | |
715baff1 | 949 | dirrewrite(dp, ip, ndp); |
a5390dce SL |
950 | if (u.u_error) { |
951 | error = u.u_error; | |
4f083fd7 | 952 | goto bad1; |
a5390dce | 953 | } |
4f083fd7 | 954 | /* |
a5390dce SL |
955 | * Adjust the link count of the target to |
956 | * reflect the dirrewrite above. If this is | |
957 | * a directory it is empty and there are | |
958 | * no links to it, so we can squash the inode and | |
959 | * any space associated with it. We disallowed | |
960 | * renaming over top of a directory with links to | |
68f21562 KM |
961 | * it above, as the remaining link would point to |
962 | * a directory without "." or ".." entries. | |
4f083fd7 | 963 | */ |
a5390dce | 964 | xp->i_nlink--; |
4f083fd7 | 965 | if (doingdirectory) { |
a5390dce SL |
966 | if (--xp->i_nlink != 0) |
967 | panic("rename: linked directory"); | |
4f083fd7 | 968 | itrunc(xp, (u_long)0); |
a5390dce | 969 | } |
4f083fd7 SL |
970 | xp->i_flag |= ICHG; |
971 | iput(xp); | |
31db12cb | 972 | xp = NULL; |
4f083fd7 SL |
973 | } |
974 | ||
975 | /* | |
976 | * 3) Unlink the source. | |
977 | */ | |
715baff1 KM |
978 | ndp->ni_nameiop = DELETE | LOCKPARENT; |
979 | ndp->ni_segflg = UIO_USERSPACE; | |
980 | ndp->ni_dirp = uap->from; | |
68f21562 | 981 | xp = namei(ndp); |
4f1a9037 KM |
982 | if (xp != NULL) |
983 | dp = ndp->ni_pdir; | |
984 | else | |
985 | dp = NULL; | |
4f083fd7 | 986 | /* |
68f21562 KM |
987 | * Insure that the directory entry still exists and has not |
988 | * changed while the new name has been entered. If the source is | |
989 | * a file then the entry may have been unlinked or renamed. In | |
990 | * either case there is no further work to be done. If the source | |
991 | * is a directory then it cannot have been rmdir'ed; its link | |
992 | * count of three would cause a rmdir to fail with ENOTEMPTY. | |
993 | * The IRENAME flag insures that it cannot be moved by another | |
994 | * rename. | |
4f083fd7 | 995 | */ |
4f1a9037 | 996 | if (xp != ip) { |
68f21562 | 997 | if (doingdirectory) |
4f1a9037 | 998 | panic("rename: lost dir entry"); |
68f21562 | 999 | } else { |
4f083fd7 | 1000 | /* |
68f21562 KM |
1001 | * If the source is a directory with a |
1002 | * new parent, the link count of the old | |
1003 | * parent directory must be decremented | |
1004 | * and ".." set to point to the new parent. | |
4f083fd7 | 1005 | */ |
68f21562 | 1006 | if (doingdirectory && newparent) { |
4f083fd7 SL |
1007 | dp->i_nlink--; |
1008 | dp->i_flag |= ICHG; | |
68f21562 KM |
1009 | error = rdwri(UIO_READ, xp, (caddr_t)&dirbuf, |
1010 | sizeof (struct dirtemplate), (off_t)0, 1, | |
1011 | (int *)0); | |
1012 | if (error == 0) { | |
1013 | if (dirbuf.dotdot_namlen != 2 || | |
1014 | dirbuf.dotdot_name[0] != '.' || | |
1015 | dirbuf.dotdot_name[1] != '.') { | |
1016 | printf("rename: mangled dir\n"); | |
1017 | } else { | |
1018 | dirbuf.dotdot_ino = newparent; | |
1019 | (void) rdwri(UIO_WRITE, xp, | |
1020 | (caddr_t)&dirbuf, | |
1021 | sizeof (struct dirtemplate), | |
1022 | (off_t)0, 1, (int *)0); | |
1023 | cacheinval(dp); | |
1024 | } | |
1025 | } | |
4f083fd7 | 1026 | } |
715baff1 | 1027 | if (dirremove(ndp)) { |
68f21562 KM |
1028 | xp->i_nlink--; |
1029 | xp->i_flag |= ICHG; | |
4f083fd7 | 1030 | } |
68f21562 KM |
1031 | xp->i_flag &= ~IRENAME; |
1032 | if (error == 0) /* XXX conservative */ | |
a5390dce | 1033 | error = u.u_error; |
4f083fd7 | 1034 | } |
4f083fd7 SL |
1035 | if (dp) |
1036 | iput(dp); | |
68f21562 KM |
1037 | if (xp) |
1038 | iput(xp); | |
1039 | irele(ip); | |
1040 | if (error) | |
1041 | u.u_error = error; | |
1042 | return; | |
a5390dce | 1043 | |
4f083fd7 | 1044 | bad: |
31db12cb | 1045 | iput(dp); |
4f083fd7 SL |
1046 | bad1: |
1047 | if (xp) | |
31db12cb | 1048 | iput(xp); |
4f083fd7 SL |
1049 | out: |
1050 | ip->i_nlink--; | |
1051 | ip->i_flag |= ICHG; | |
1052 | irele(ip); | |
a5390dce SL |
1053 | if (error) |
1054 | u.u_error = error; | |
528f664c SL |
1055 | } |
1056 | ||
64d3a787 BJ |
1057 | /* |
1058 | * Make a new file. | |
1059 | */ | |
1060 | struct inode * | |
715baff1 | 1061 | maknode(mode, ndp) |
64d3a787 | 1062 | int mode; |
715baff1 | 1063 | register struct nameidata *ndp; |
64d3a787 BJ |
1064 | { |
1065 | register struct inode *ip; | |
715baff1 | 1066 | register struct inode *pdir = ndp->ni_pdir; |
64d3a787 BJ |
1067 | ino_t ipref; |
1068 | ||
1069 | if ((mode & IFMT) == IFDIR) | |
715baff1 | 1070 | ipref = dirpref(pdir->i_fs); |
64d3a787 | 1071 | else |
715baff1 KM |
1072 | ipref = pdir->i_number; |
1073 | ip = ialloc(pdir, ipref, mode); | |
64d3a787 | 1074 | if (ip == NULL) { |
715baff1 | 1075 | iput(pdir); |
528f664c | 1076 | return (NULL); |
64d3a787 | 1077 | } |
528f664c | 1078 | #ifdef QUOTA |
64d3a787 BJ |
1079 | if (ip->i_dquot != NODQUOT) |
1080 | panic("maknode: dquot"); | |
1081 | #endif | |
1082 | ip->i_flag |= IACC|IUPD|ICHG; | |
1083 | if ((mode & IFMT) == 0) | |
1084 | mode |= IFREG; | |
1085 | ip->i_mode = mode & ~u.u_cmask; | |
1086 | ip->i_nlink = 1; | |
1087 | ip->i_uid = u.u_uid; | |
715baff1 | 1088 | ip->i_gid = pdir->i_gid; |
bb1b75f4 SL |
1089 | if (ip->i_mode & ISGID && !groupmember(ip->i_gid)) |
1090 | ip->i_mode &= ~ISGID; | |
528f664c | 1091 | #ifdef QUOTA |
64d3a787 BJ |
1092 | ip->i_dquot = inoquota(ip); |
1093 | #endif | |
1094 | ||
1095 | /* | |
1096 | * Make sure inode goes to disk before directory entry. | |
1097 | */ | |
3fd23f5c | 1098 | iupdat(ip, &time, &time, 1); |
715baff1 | 1099 | u.u_error = direnter(ip, ndp); |
64d3a787 BJ |
1100 | if (u.u_error) { |
1101 | /* | |
f2a5ad78 SL |
1102 | * Write error occurred trying to update directory |
1103 | * so must deallocate the inode. | |
64d3a787 BJ |
1104 | */ |
1105 | ip->i_nlink = 0; | |
1106 | ip->i_flag |= ICHG; | |
1107 | iput(ip); | |
528f664c | 1108 | return (NULL); |
64d3a787 | 1109 | } |
528f664c | 1110 | return (ip); |
64d3a787 | 1111 | } |
88a7a62a SL |
1112 | |
1113 | /* | |
1114 | * A virgin directory (no blushing please). | |
1115 | */ | |
1116 | struct dirtemplate mastertemplate = { | |
1117 | 0, 12, 1, ".", | |
1118 | 0, DIRBLKSIZ - 12, 2, ".." | |
1119 | }; | |
1120 | ||
1121 | /* | |
1122 | * Mkdir system call | |
1123 | */ | |
1124 | mkdir() | |
1125 | { | |
1126 | struct a { | |
1127 | char *name; | |
1128 | int dmode; | |
715baff1 | 1129 | } *uap = (struct a *)u.u_ap; |
88a7a62a SL |
1130 | register struct inode *ip, *dp; |
1131 | struct dirtemplate dirtemplate; | |
715baff1 | 1132 | register struct nameidata *ndp = &u.u_nd; |
88a7a62a | 1133 | |
715baff1 KM |
1134 | ndp->ni_nameiop = CREATE; |
1135 | ndp->ni_segflg = UIO_USERSPACE; | |
1136 | ndp->ni_dirp = uap->name; | |
1137 | ip = namei(ndp); | |
88a7a62a SL |
1138 | if (u.u_error) |
1139 | return; | |
1140 | if (ip != NULL) { | |
1141 | iput(ip); | |
1142 | u.u_error = EEXIST; | |
1143 | return; | |
1144 | } | |
715baff1 | 1145 | dp = ndp->ni_pdir; |
88a7a62a SL |
1146 | uap->dmode &= 0777; |
1147 | uap->dmode |= IFDIR; | |
1148 | /* | |
1149 | * Must simulate part of maknode here | |
1150 | * in order to acquire the inode, but | |
1151 | * not have it entered in the parent | |
1152 | * directory. The entry is made later | |
1153 | * after writing "." and ".." entries out. | |
1154 | */ | |
1155 | ip = ialloc(dp, dirpref(dp->i_fs), uap->dmode); | |
1156 | if (ip == NULL) { | |
1157 | iput(dp); | |
1158 | return; | |
1159 | } | |
1160 | #ifdef QUOTA | |
1161 | if (ip->i_dquot != NODQUOT) | |
1162 | panic("mkdir: dquot"); | |
1163 | #endif | |
1164 | ip->i_flag |= IACC|IUPD|ICHG; | |
1165 | ip->i_mode = uap->dmode & ~u.u_cmask; | |
1166 | ip->i_nlink = 2; | |
1167 | ip->i_uid = u.u_uid; | |
1168 | ip->i_gid = dp->i_gid; | |
1169 | #ifdef QUOTA | |
1170 | ip->i_dquot = inoquota(ip); | |
1171 | #endif | |
1172 | iupdat(ip, &time, &time, 1); | |
1173 | ||
1174 | /* | |
1175 | * Bump link count in parent directory | |
1176 | * to reflect work done below. Should | |
1177 | * be done before reference is created | |
1178 | * so reparation is possible if we crash. | |
1179 | */ | |
1180 | dp->i_nlink++; | |
1181 | dp->i_flag |= ICHG; | |
1182 | iupdat(dp, &time, &time, 1); | |
1183 | ||
1184 | /* | |
1185 | * Initialize directory with "." | |
1186 | * and ".." from static template. | |
1187 | */ | |
1188 | dirtemplate = mastertemplate; | |
1189 | dirtemplate.dot_ino = ip->i_number; | |
1190 | dirtemplate.dotdot_ino = dp->i_number; | |
1191 | u.u_error = rdwri(UIO_WRITE, ip, (caddr_t)&dirtemplate, | |
1192 | sizeof (dirtemplate), (off_t)0, 1, (int *)0); | |
1193 | if (u.u_error) { | |
1194 | dp->i_nlink--; | |
1195 | dp->i_flag |= ICHG; | |
1196 | goto bad; | |
1197 | } | |
23de9f20 KM |
1198 | if (DIRBLKSIZ > ip->i_fs->fs_fsize) |
1199 | panic("mkdir: blksize"); /* XXX - should grow with bmap() */ | |
1200 | else | |
1201 | ip->i_size = DIRBLKSIZ; | |
88a7a62a SL |
1202 | /* |
1203 | * Directory all set up, now | |
1204 | * install the entry for it in | |
1205 | * the parent directory. | |
1206 | */ | |
715baff1 | 1207 | u.u_error = direnter(ip, ndp); |
88a7a62a SL |
1208 | dp = NULL; |
1209 | if (u.u_error) { | |
715baff1 KM |
1210 | ndp->ni_nameiop = LOOKUP | NOCACHE; |
1211 | ndp->ni_segflg = UIO_USERSPACE; | |
1212 | ndp->ni_dirp = uap->name; | |
1213 | dp = namei(ndp); | |
88a7a62a SL |
1214 | if (dp) { |
1215 | dp->i_nlink--; | |
1216 | dp->i_flag |= ICHG; | |
1217 | } | |
1218 | } | |
1219 | bad: | |
1220 | /* | |
1221 | * No need to do an explicit itrunc here, | |
1222 | * irele will do this for us because we set | |
1223 | * the link count to 0. | |
1224 | */ | |
1225 | if (u.u_error) { | |
1226 | ip->i_nlink = 0; | |
1227 | ip->i_flag |= ICHG; | |
1228 | } | |
1229 | if (dp) | |
1230 | iput(dp); | |
1231 | iput(ip); | |
1232 | } | |
1233 | ||
1234 | /* | |
1235 | * Rmdir system call. | |
1236 | */ | |
1237 | rmdir() | |
1238 | { | |
1239 | struct a { | |
1240 | char *name; | |
715baff1 | 1241 | } *uap = (struct a *)u.u_ap; |
88a7a62a | 1242 | register struct inode *ip, *dp; |
715baff1 | 1243 | register struct nameidata *ndp = &u.u_nd; |
88a7a62a | 1244 | |
715baff1 KM |
1245 | ndp->ni_nameiop = DELETE | LOCKPARENT; |
1246 | ndp->ni_segflg = UIO_USERSPACE; | |
1247 | ndp->ni_dirp = uap->name; | |
1248 | ip = namei(ndp); | |
88a7a62a SL |
1249 | if (ip == NULL) |
1250 | return; | |
715baff1 | 1251 | dp = ndp->ni_pdir; |
88a7a62a SL |
1252 | /* |
1253 | * No rmdir "." please. | |
1254 | */ | |
1255 | if (dp == ip) { | |
1256 | irele(dp); | |
1257 | iput(ip); | |
1258 | u.u_error = EINVAL; | |
1259 | return; | |
1260 | } | |
1261 | if ((ip->i_mode&IFMT) != IFDIR) { | |
1262 | u.u_error = ENOTDIR; | |
1263 | goto out; | |
1264 | } | |
1265 | /* | |
1266 | * Don't remove a mounted on directory. | |
1267 | */ | |
1268 | if (ip->i_dev != dp->i_dev) { | |
1269 | u.u_error = EBUSY; | |
1270 | goto out; | |
1271 | } | |
1272 | /* | |
1273 | * Verify the directory is empty (and valid). | |
1274 | * (Rmdir ".." won't be valid since | |
1275 | * ".." will contain a reference to | |
1276 | * the current directory and thus be | |
1277 | * non-empty.) | |
1278 | */ | |
68f21562 | 1279 | if (ip->i_nlink != 2 || !dirempty(ip, dp->i_number)) { |
88a7a62a SL |
1280 | u.u_error = ENOTEMPTY; |
1281 | goto out; | |
1282 | } | |
1283 | /* | |
1284 | * Delete reference to directory before purging | |
1285 | * inode. If we crash in between, the directory | |
1286 | * will be reattached to lost+found, | |
1287 | */ | |
715baff1 | 1288 | if (dirremove(ndp) == 0) |
88a7a62a SL |
1289 | goto out; |
1290 | dp->i_nlink--; | |
1291 | dp->i_flag |= ICHG; | |
68f21562 | 1292 | cacheinval(dp); |
88a7a62a SL |
1293 | iput(dp); |
1294 | dp = NULL; | |
1295 | /* | |
1296 | * Truncate inode. The only stuff left | |
1297 | * in the directory is "." and "..". The | |
1298 | * "." reference is inconsequential since | |
1299 | * we're quashing it. The ".." reference | |
1300 | * has already been adjusted above. We've | |
1301 | * removed the "." reference and the reference | |
1302 | * in the parent directory, but there may be | |
1303 | * other hard links so decrement by 2 and | |
1304 | * worry about them later. | |
1305 | */ | |
1306 | ip->i_nlink -= 2; | |
1307 | itrunc(ip, (u_long)0); | |
1d00c1cf | 1308 | cacheinval(ip); |
88a7a62a SL |
1309 | out: |
1310 | if (dp) | |
1311 | iput(dp); | |
1312 | iput(ip); | |
1313 | } | |
1314 | ||
1315 | struct file * | |
1316 | getinode(fdes) | |
1317 | int fdes; | |
1318 | { | |
8462a185 | 1319 | struct file *fp; |
88a7a62a | 1320 | |
8462a185 SL |
1321 | if ((unsigned)fdes >= NOFILE || (fp = u.u_ofile[fdes]) == NULL) { |
1322 | u.u_error = EBADF; | |
1323 | return ((struct file *)0); | |
1324 | } | |
88a7a62a SL |
1325 | if (fp->f_type != DTYPE_INODE) { |
1326 | u.u_error = EINVAL; | |
8462a185 | 1327 | return ((struct file *)0); |
88a7a62a SL |
1328 | } |
1329 | return (fp); | |
1330 | } | |
1331 | ||
1332 | /* | |
1333 | * mode mask for creation of files | |
1334 | */ | |
1335 | umask() | |
1336 | { | |
1337 | register struct a { | |
1338 | int mask; | |
715baff1 | 1339 | } *uap = (struct a *)u.u_ap; |
88a7a62a | 1340 | |
88a7a62a SL |
1341 | u.u_r.r_val1 = u.u_cmask; |
1342 | u.u_cmask = uap->mask & 07777; | |
1343 | } |