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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1989 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | * | |
78ed81a3 | 33 | * from: @(#)spec_vnops.c 7.37 (Berkeley) 5/30/91 |
34 | * $Id$ | |
15637ed4 RG |
35 | */ |
36 | ||
37 | #include "param.h" | |
38 | #include "proc.h" | |
39 | #include "systm.h" | |
40 | #include "kernel.h" | |
41 | #include "conf.h" | |
42 | #include "buf.h" | |
43 | #include "mount.h" | |
44 | #include "namei.h" | |
45 | #include "vnode.h" | |
46 | #include "specdev.h" | |
47 | #include "stat.h" | |
48 | #include "errno.h" | |
49 | #include "ioctl.h" | |
50 | #include "file.h" | |
51 | #include "dkbad.h" /* XXX */ | |
52 | #include "disklabel.h" | |
53 | ||
54 | /* symbolic sleep message strings for devices */ | |
55 | char devopn[] = "devopn"; | |
56 | char devio[] = "devio"; | |
57 | char devwait[] = "devwait"; | |
58 | char devin[] = "devin"; | |
59 | char devout[] = "devout"; | |
60 | char devioc[] = "devioc"; | |
61 | char devcls[] = "devcls"; | |
62 | ||
63 | struct vnodeops spec_vnodeops = { | |
64 | spec_lookup, /* lookup */ | |
65 | spec_create, /* create */ | |
66 | spec_mknod, /* mknod */ | |
67 | spec_open, /* open */ | |
68 | spec_close, /* close */ | |
69 | spec_access, /* access */ | |
70 | spec_getattr, /* getattr */ | |
71 | spec_setattr, /* setattr */ | |
72 | spec_read, /* read */ | |
73 | spec_write, /* write */ | |
74 | spec_ioctl, /* ioctl */ | |
75 | spec_select, /* select */ | |
76 | spec_mmap, /* mmap */ | |
77 | spec_fsync, /* fsync */ | |
78 | spec_seek, /* seek */ | |
79 | spec_remove, /* remove */ | |
80 | spec_link, /* link */ | |
81 | spec_rename, /* rename */ | |
82 | spec_mkdir, /* mkdir */ | |
83 | spec_rmdir, /* rmdir */ | |
84 | spec_symlink, /* symlink */ | |
85 | spec_readdir, /* readdir */ | |
86 | spec_readlink, /* readlink */ | |
87 | spec_abortop, /* abortop */ | |
88 | spec_inactive, /* inactive */ | |
89 | spec_reclaim, /* reclaim */ | |
90 | spec_lock, /* lock */ | |
91 | spec_unlock, /* unlock */ | |
92 | spec_bmap, /* bmap */ | |
93 | spec_strategy, /* strategy */ | |
94 | spec_print, /* print */ | |
95 | spec_islocked, /* islocked */ | |
96 | spec_advlock, /* advlock */ | |
97 | }; | |
98 | ||
99 | /* | |
100 | * Trivial lookup routine that always fails. | |
101 | */ | |
102 | spec_lookup(vp, ndp, p) | |
103 | struct vnode *vp; | |
104 | struct nameidata *ndp; | |
105 | struct proc *p; | |
106 | { | |
107 | ||
108 | ndp->ni_dvp = vp; | |
109 | ndp->ni_vp = NULL; | |
110 | return (ENOTDIR); | |
111 | } | |
112 | ||
113 | /* | |
114 | * Open a special file: Don't allow open if fs is mounted -nodev, | |
115 | * and don't allow opens of block devices that are currently mounted. | |
116 | * Otherwise, call device driver open function. | |
117 | */ | |
118 | /* ARGSUSED */ | |
119 | spec_open(vp, mode, cred, p) | |
120 | register struct vnode *vp; | |
121 | int mode; | |
122 | struct ucred *cred; | |
123 | struct proc *p; | |
124 | { | |
125 | dev_t dev = (dev_t)vp->v_rdev; | |
126 | register int maj = major(dev); | |
127 | int error; | |
128 | ||
129 | if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_NODEV)) | |
130 | return (ENXIO); | |
131 | ||
132 | switch (vp->v_type) { | |
133 | ||
134 | case VCHR: | |
135 | if ((u_int)maj >= nchrdev) | |
136 | return (ENXIO); | |
137 | VOP_UNLOCK(vp); | |
138 | error = (*cdevsw[maj].d_open)(dev, mode, S_IFCHR, p); | |
139 | VOP_LOCK(vp); | |
140 | return (error); | |
141 | ||
142 | case VBLK: | |
143 | if ((u_int)maj >= nblkdev) | |
144 | return (ENXIO); | |
145 | if (error = mountedon(vp)) | |
146 | return (error); | |
147 | return ((*bdevsw[maj].d_open)(dev, mode, S_IFBLK, p)); | |
148 | } | |
149 | return (0); | |
150 | } | |
151 | ||
152 | /* | |
153 | * Vnode op for read | |
154 | */ | |
155 | /* ARGSUSED */ | |
156 | spec_read(vp, uio, ioflag, cred) | |
157 | register struct vnode *vp; | |
158 | register struct uio *uio; | |
159 | int ioflag; | |
160 | struct ucred *cred; | |
161 | { | |
162 | struct proc *p = uio->uio_procp; | |
163 | struct buf *bp; | |
164 | daddr_t bn; | |
165 | long bsize, bscale; | |
166 | struct partinfo dpart; | |
167 | register int n, on; | |
168 | int error = 0; | |
169 | extern int mem_no; | |
170 | ||
171 | #ifdef DIAGNOSTIC | |
172 | if (uio->uio_rw != UIO_READ) | |
173 | panic("spec_read mode"); | |
174 | if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc) | |
175 | panic("spec_read proc"); | |
176 | #endif | |
177 | if (uio->uio_resid == 0) | |
178 | return (0); | |
179 | ||
180 | switch (vp->v_type) { | |
181 | ||
182 | case VCHR: | |
183 | /* | |
184 | * Negative offsets allowed only for /dev/kmem | |
185 | */ | |
186 | if (uio->uio_offset < 0 && major(vp->v_rdev) != mem_no) | |
187 | return (EINVAL); | |
188 | VOP_UNLOCK(vp); | |
189 | error = (*cdevsw[major(vp->v_rdev)].d_read) | |
190 | (vp->v_rdev, uio, ioflag); | |
191 | VOP_LOCK(vp); | |
192 | return (error); | |
193 | ||
194 | case VBLK: | |
195 | if (uio->uio_offset < 0) | |
196 | return (EINVAL); | |
197 | bsize = BLKDEV_IOSIZE; | |
198 | if ((*bdevsw[major(vp->v_rdev)].d_ioctl)(vp->v_rdev, DIOCGPART, | |
199 | (caddr_t)&dpart, FREAD, p) == 0) { | |
200 | if (dpart.part->p_fstype == FS_BSDFFS && | |
201 | dpart.part->p_frag != 0 && dpart.part->p_fsize != 0) | |
202 | bsize = dpart.part->p_frag * | |
203 | dpart.part->p_fsize; | |
204 | } | |
205 | bscale = bsize / DEV_BSIZE; | |
206 | do { | |
207 | bn = (uio->uio_offset / DEV_BSIZE) &~ (bscale - 1); | |
208 | on = uio->uio_offset % bsize; | |
209 | n = MIN((unsigned)(bsize - on), uio->uio_resid); | |
210 | if (vp->v_lastr + bscale == bn) | |
211 | error = breada(vp, bn, (int)bsize, bn + bscale, | |
212 | (int)bsize, NOCRED, &bp); | |
213 | else | |
214 | error = bread(vp, bn, (int)bsize, NOCRED, &bp); | |
215 | vp->v_lastr = bn; | |
216 | n = MIN(n, bsize - bp->b_resid); | |
217 | if (error) { | |
218 | brelse(bp); | |
219 | return (error); | |
220 | } | |
221 | error = uiomove(bp->b_un.b_addr + on, n, uio); | |
222 | #ifdef OMIT /* 20 Aug 92*/ | |
223 | if (n + on == bsize) | |
224 | bp->b_flags |= B_AGE; | |
225 | #endif /* OMIT*/ | |
226 | brelse(bp); | |
227 | } while (error == 0 && uio->uio_resid > 0 && n != 0); | |
228 | return (error); | |
229 | ||
230 | default: | |
231 | panic("spec_read type"); | |
232 | } | |
233 | /* NOTREACHED */ | |
234 | } | |
235 | ||
236 | /* | |
237 | * Vnode op for write | |
238 | */ | |
239 | /* ARGSUSED */ | |
240 | spec_write(vp, uio, ioflag, cred) | |
241 | register struct vnode *vp; | |
242 | register struct uio *uio; | |
243 | int ioflag; | |
244 | struct ucred *cred; | |
245 | { | |
246 | struct proc *p = uio->uio_procp; | |
247 | struct buf *bp; | |
248 | daddr_t bn; | |
249 | int bsize, blkmask; | |
250 | struct partinfo dpart; | |
251 | register int n, on; | |
252 | int error = 0; | |
253 | extern int mem_no; | |
254 | ||
255 | #ifdef DIAGNOSTIC | |
256 | if (uio->uio_rw != UIO_WRITE) | |
257 | panic("spec_write mode"); | |
258 | if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc) | |
259 | panic("spec_write proc"); | |
260 | #endif | |
261 | ||
262 | switch (vp->v_type) { | |
263 | ||
264 | case VCHR: | |
265 | /* | |
266 | * Negative offsets allowed only for /dev/kmem | |
267 | */ | |
268 | if (uio->uio_offset < 0 && major(vp->v_rdev) != mem_no) | |
269 | return (EINVAL); | |
270 | VOP_UNLOCK(vp); | |
271 | error = (*cdevsw[major(vp->v_rdev)].d_write) | |
272 | (vp->v_rdev, uio, ioflag); | |
273 | VOP_LOCK(vp); | |
274 | return (error); | |
275 | ||
276 | case VBLK: | |
277 | if (uio->uio_resid == 0) | |
278 | return (0); | |
279 | if (uio->uio_offset < 0) | |
280 | return (EINVAL); | |
281 | bsize = BLKDEV_IOSIZE; | |
282 | if ((*bdevsw[major(vp->v_rdev)].d_ioctl)(vp->v_rdev, DIOCGPART, | |
283 | (caddr_t)&dpart, FREAD, p) == 0) { | |
284 | if (dpart.part->p_fstype == FS_BSDFFS && | |
285 | dpart.part->p_frag != 0 && dpart.part->p_fsize != 0) | |
286 | bsize = dpart.part->p_frag * | |
287 | dpart.part->p_fsize; | |
288 | } | |
289 | blkmask = (bsize / DEV_BSIZE) - 1; | |
290 | do { | |
291 | bn = (uio->uio_offset / DEV_BSIZE) &~ blkmask; | |
292 | on = uio->uio_offset % bsize; | |
293 | n = MIN((unsigned)(bsize - on), uio->uio_resid); | |
294 | if (n == bsize) | |
295 | bp = getblk(vp, bn, bsize); | |
296 | else | |
297 | error = bread(vp, bn, bsize, NOCRED, &bp); | |
298 | n = MIN(n, bsize - bp->b_resid); | |
299 | if (error) { | |
300 | brelse(bp); | |
301 | return (error); | |
302 | } | |
303 | error = uiomove(bp->b_un.b_addr + on, n, uio); | |
304 | if (n + on == bsize) { | |
305 | bp->b_flags |= B_AGE; | |
306 | bawrite(bp); | |
307 | } else | |
308 | bdwrite(bp); | |
309 | } while (error == 0 && uio->uio_resid > 0 && n != 0); | |
310 | return (error); | |
311 | ||
312 | default: | |
313 | panic("spec_write type"); | |
314 | } | |
315 | /* NOTREACHED */ | |
316 | } | |
317 | ||
318 | /* | |
319 | * Device ioctl operation. | |
320 | */ | |
321 | /* ARGSUSED */ | |
322 | spec_ioctl(vp, com, data, fflag, cred, p) | |
323 | struct vnode *vp; | |
324 | int com; | |
325 | caddr_t data; | |
326 | int fflag; | |
327 | struct ucred *cred; | |
328 | struct proc *p; | |
329 | { | |
330 | dev_t dev = vp->v_rdev; | |
331 | ||
332 | switch (vp->v_type) { | |
333 | ||
334 | case VCHR: | |
335 | return ((*cdevsw[major(dev)].d_ioctl)(dev, com, data, | |
336 | fflag, p)); | |
337 | ||
338 | case VBLK: | |
339 | if (com == 0 && (int)data == B_TAPE) | |
340 | if (bdevsw[major(dev)].d_flags & B_TAPE) | |
341 | return (0); | |
342 | else | |
343 | return (1); | |
344 | return ((*bdevsw[major(dev)].d_ioctl)(dev, com, data, | |
345 | fflag, p)); | |
346 | ||
347 | default: | |
348 | panic("spec_ioctl"); | |
349 | /* NOTREACHED */ | |
350 | } | |
351 | } | |
352 | ||
353 | /* ARGSUSED */ | |
354 | spec_select(vp, which, fflags, cred, p) | |
355 | struct vnode *vp; | |
356 | int which, fflags; | |
357 | struct ucred *cred; | |
358 | struct proc *p; | |
359 | { | |
360 | register dev_t dev; | |
361 | ||
362 | switch (vp->v_type) { | |
363 | ||
364 | default: | |
365 | return (1); /* XXX */ | |
366 | ||
367 | case VCHR: | |
368 | dev = vp->v_rdev; | |
369 | return (*cdevsw[major(dev)].d_select)(dev, which, p); | |
370 | } | |
371 | } | |
372 | ||
373 | /* | |
374 | * Just call the device strategy routine | |
375 | */ | |
376 | spec_strategy(bp) | |
377 | register struct buf *bp; | |
378 | { | |
379 | ||
380 | (*bdevsw[major(bp->b_dev)].d_strategy)(bp); | |
381 | return (0); | |
382 | } | |
383 | ||
384 | /* | |
385 | * This is a noop, simply returning what one has been given. | |
386 | */ | |
387 | spec_bmap(vp, bn, vpp, bnp) | |
388 | struct vnode *vp; | |
389 | daddr_t bn; | |
390 | struct vnode **vpp; | |
391 | daddr_t *bnp; | |
392 | { | |
393 | ||
394 | if (vpp != NULL) | |
395 | *vpp = vp; | |
396 | if (bnp != NULL) | |
397 | *bnp = bn; | |
398 | return (0); | |
399 | } | |
400 | ||
401 | /* | |
402 | * At the moment we do not do any locking. | |
403 | */ | |
404 | /* ARGSUSED */ | |
405 | spec_lock(vp) | |
406 | struct vnode *vp; | |
407 | { | |
408 | ||
409 | return (0); | |
410 | } | |
411 | ||
412 | /* ARGSUSED */ | |
413 | spec_unlock(vp) | |
414 | struct vnode *vp; | |
415 | { | |
416 | ||
417 | return (0); | |
418 | } | |
419 | ||
420 | /* | |
421 | * Device close routine | |
422 | */ | |
423 | /* ARGSUSED */ | |
424 | spec_close(vp, flag, cred, p) | |
425 | register struct vnode *vp; | |
426 | int flag; | |
427 | struct ucred *cred; | |
428 | struct proc *p; | |
429 | { | |
430 | dev_t dev = vp->v_rdev; | |
431 | int (*devclose) __P((dev_t, int, int, struct proc *)); | |
432 | int mode; | |
433 | ||
434 | switch (vp->v_type) { | |
435 | ||
436 | case VCHR: | |
437 | /* | |
438 | * If the vnode is locked, then we are in the midst | |
439 | * of forcably closing the device, otherwise we only | |
440 | * close on last reference. | |
441 | */ | |
442 | if (vcount(vp) > 1 && (vp->v_flag & VXLOCK) == 0) | |
443 | return (0); | |
444 | devclose = cdevsw[major(dev)].d_close; | |
445 | mode = S_IFCHR; | |
446 | break; | |
447 | ||
448 | case VBLK: | |
449 | /* | |
450 | * On last close of a block device (that isn't mounted) | |
451 | * we must invalidate any in core blocks, so that | |
452 | * we can, for instance, change floppy disks. | |
453 | */ | |
454 | vflushbuf(vp, 0); | |
455 | if (vinvalbuf(vp, 1)) | |
456 | return (0); | |
457 | /* | |
458 | * We do not want to really close the device if it | |
459 | * is still in use unless we are trying to close it | |
460 | * forcibly. Since every use (buffer, vnode, swap, cmap) | |
461 | * holds a reference to the vnode, and because we mark | |
462 | * any other vnodes that alias this device, when the | |
463 | * sum of the reference counts on all the aliased | |
464 | * vnodes descends to one, we are on last close. | |
465 | */ | |
466 | if (vcount(vp) > 1 && (vp->v_flag & VXLOCK) == 0) | |
467 | return (0); | |
468 | devclose = bdevsw[major(dev)].d_close; | |
469 | mode = S_IFBLK; | |
470 | break; | |
471 | ||
472 | default: | |
473 | panic("spec_close: not special"); | |
474 | } | |
475 | ||
476 | return ((*devclose)(dev, flag, mode, p)); | |
477 | } | |
478 | ||
479 | /* | |
480 | * Print out the contents of a special device vnode. | |
481 | */ | |
482 | spec_print(vp) | |
483 | struct vnode *vp; | |
484 | { | |
485 | ||
486 | printf("tag VT_NON, dev %d, %d\n", major(vp->v_rdev), | |
487 | minor(vp->v_rdev)); | |
488 | } | |
489 | ||
490 | /* | |
491 | * Special device advisory byte-level locks. | |
492 | */ | |
493 | /* ARGSUSED */ | |
494 | spec_advlock(vp, id, op, fl, flags) | |
495 | struct vnode *vp; | |
496 | caddr_t id; | |
497 | int op; | |
498 | struct flock *fl; | |
499 | int flags; | |
500 | { | |
501 | ||
502 | return (EOPNOTSUPP); | |
503 | } | |
504 | ||
505 | /* | |
506 | * Special device failed operation | |
507 | */ | |
508 | spec_ebadf() | |
509 | { | |
510 | ||
511 | return (EBADF); | |
512 | } | |
513 | ||
514 | /* | |
515 | * Special device bad operation | |
516 | */ | |
517 | spec_badop() | |
518 | { | |
519 | ||
520 | panic("spec_badop called"); | |
521 | /* NOTREACHED */ | |
522 | } |