FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_conf.c
1 /*-
2 * Copyright (c) 1999-2002 Poul-Henning Kamp
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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/10.2/sys/kern/kern_conf.c 280579 2015-03-25 13:01:51Z hselasky $");
29
30 #include <sys/param.h>
31 #include <sys/kernel.h>
32 #include <sys/systm.h>
33 #include <sys/bus.h>
34 #include <sys/bio.h>
35 #include <sys/lock.h>
36 #include <sys/mutex.h>
37 #include <sys/module.h>
38 #include <sys/malloc.h>
39 #include <sys/conf.h>
40 #include <sys/vnode.h>
41 #include <sys/queue.h>
42 #include <sys/poll.h>
43 #include <sys/sx.h>
44 #include <sys/ctype.h>
45 #include <sys/ucred.h>
46 #include <sys/taskqueue.h>
47 #include <machine/stdarg.h>
48
49 #include <fs/devfs/devfs_int.h>
50 #include <vm/vm.h>
51
52 static MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage");
53
54 struct mtx devmtx;
55 static void destroy_devl(struct cdev *dev);
56 static int destroy_dev_sched_cbl(struct cdev *dev,
57 void (*cb)(void *), void *arg);
58 static void destroy_dev_tq(void *ctx, int pending);
59 static int make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw,
60 int unit, struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt,
61 va_list ap);
62
63 static struct cdev_priv_list cdevp_free_list =
64 TAILQ_HEAD_INITIALIZER(cdevp_free_list);
65 static SLIST_HEAD(free_cdevsw, cdevsw) cdevsw_gt_post_list =
66 SLIST_HEAD_INITIALIZER(cdevsw_gt_post_list);
67
68 void
69 dev_lock(void)
70 {
71
72 mtx_lock(&devmtx);
73 }
74
75 /*
76 * Free all the memory collected while the cdev mutex was
77 * locked. Since devmtx is after the system map mutex, free() cannot
78 * be called immediately and is postponed until cdev mutex can be
79 * dropped.
80 */
81 static void
82 dev_unlock_and_free(void)
83 {
84 struct cdev_priv_list cdp_free;
85 struct free_cdevsw csw_free;
86 struct cdev_priv *cdp;
87 struct cdevsw *csw;
88
89 mtx_assert(&devmtx, MA_OWNED);
90
91 /*
92 * Make the local copy of the list heads while the dev_mtx is
93 * held. Free it later.
94 */
95 TAILQ_INIT(&cdp_free);
96 TAILQ_CONCAT(&cdp_free, &cdevp_free_list, cdp_list);
97 csw_free = cdevsw_gt_post_list;
98 SLIST_INIT(&cdevsw_gt_post_list);
99
100 mtx_unlock(&devmtx);
101
102 while ((cdp = TAILQ_FIRST(&cdp_free)) != NULL) {
103 TAILQ_REMOVE(&cdp_free, cdp, cdp_list);
104 devfs_free(&cdp->cdp_c);
105 }
106 while ((csw = SLIST_FIRST(&csw_free)) != NULL) {
107 SLIST_REMOVE_HEAD(&csw_free, d_postfree_list);
108 free(csw, M_DEVT);
109 }
110 }
111
112 static void
113 dev_free_devlocked(struct cdev *cdev)
114 {
115 struct cdev_priv *cdp;
116
117 mtx_assert(&devmtx, MA_OWNED);
118 cdp = cdev2priv(cdev);
119 KASSERT((cdp->cdp_flags & CDP_UNREF_DTR) == 0,
120 ("destroy_dev() was not called after delist_dev(%p)", cdev));
121 TAILQ_INSERT_HEAD(&cdevp_free_list, cdp, cdp_list);
122 }
123
124 static void
125 cdevsw_free_devlocked(struct cdevsw *csw)
126 {
127
128 mtx_assert(&devmtx, MA_OWNED);
129 SLIST_INSERT_HEAD(&cdevsw_gt_post_list, csw, d_postfree_list);
130 }
131
132 void
133 dev_unlock(void)
134 {
135
136 mtx_unlock(&devmtx);
137 }
138
139 void
140 dev_ref(struct cdev *dev)
141 {
142
143 mtx_assert(&devmtx, MA_NOTOWNED);
144 mtx_lock(&devmtx);
145 dev->si_refcount++;
146 mtx_unlock(&devmtx);
147 }
148
149 void
150 dev_refl(struct cdev *dev)
151 {
152
153 mtx_assert(&devmtx, MA_OWNED);
154 dev->si_refcount++;
155 }
156
157 void
158 dev_rel(struct cdev *dev)
159 {
160 int flag = 0;
161
162 mtx_assert(&devmtx, MA_NOTOWNED);
163 dev_lock();
164 dev->si_refcount--;
165 KASSERT(dev->si_refcount >= 0,
166 ("dev_rel(%s) gave negative count", devtoname(dev)));
167 #if 0
168 if (dev->si_usecount == 0 &&
169 (dev->si_flags & SI_CHEAPCLONE) && (dev->si_flags & SI_NAMED))
170 ;
171 else
172 #endif
173 if (dev->si_devsw == NULL && dev->si_refcount == 0) {
174 LIST_REMOVE(dev, si_list);
175 flag = 1;
176 }
177 dev_unlock();
178 if (flag)
179 devfs_free(dev);
180 }
181
182 struct cdevsw *
183 dev_refthread(struct cdev *dev, int *ref)
184 {
185 struct cdevsw *csw;
186 struct cdev_priv *cdp;
187
188 mtx_assert(&devmtx, MA_NOTOWNED);
189 if ((dev->si_flags & SI_ETERNAL) != 0) {
190 *ref = 0;
191 return (dev->si_devsw);
192 }
193 dev_lock();
194 csw = dev->si_devsw;
195 if (csw != NULL) {
196 cdp = cdev2priv(dev);
197 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0)
198 atomic_add_long(&dev->si_threadcount, 1);
199 else
200 csw = NULL;
201 }
202 dev_unlock();
203 *ref = 1;
204 return (csw);
205 }
206
207 struct cdevsw *
208 devvn_refthread(struct vnode *vp, struct cdev **devp, int *ref)
209 {
210 struct cdevsw *csw;
211 struct cdev_priv *cdp;
212 struct cdev *dev;
213
214 mtx_assert(&devmtx, MA_NOTOWNED);
215 if ((vp->v_vflag & VV_ETERNALDEV) != 0) {
216 dev = vp->v_rdev;
217 if (dev == NULL)
218 return (NULL);
219 KASSERT((dev->si_flags & SI_ETERNAL) != 0,
220 ("Not eternal cdev"));
221 *ref = 0;
222 csw = dev->si_devsw;
223 KASSERT(csw != NULL, ("Eternal cdev is destroyed"));
224 *devp = dev;
225 return (csw);
226 }
227
228 csw = NULL;
229 dev_lock();
230 dev = vp->v_rdev;
231 if (dev == NULL) {
232 dev_unlock();
233 return (NULL);
234 }
235 cdp = cdev2priv(dev);
236 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) {
237 csw = dev->si_devsw;
238 if (csw != NULL)
239 atomic_add_long(&dev->si_threadcount, 1);
240 }
241 dev_unlock();
242 if (csw != NULL) {
243 *devp = dev;
244 *ref = 1;
245 }
246 return (csw);
247 }
248
249 void
250 dev_relthread(struct cdev *dev, int ref)
251 {
252
253 mtx_assert(&devmtx, MA_NOTOWNED);
254 if (!ref)
255 return;
256 KASSERT(dev->si_threadcount > 0,
257 ("%s threadcount is wrong", dev->si_name));
258 atomic_subtract_rel_long(&dev->si_threadcount, 1);
259 }
260
261 int
262 nullop(void)
263 {
264
265 return (0);
266 }
267
268 int
269 eopnotsupp(void)
270 {
271
272 return (EOPNOTSUPP);
273 }
274
275 static int
276 enxio(void)
277 {
278 return (ENXIO);
279 }
280
281 static int
282 enodev(void)
283 {
284 return (ENODEV);
285 }
286
287 /* Define a dead_cdevsw for use when devices leave unexpectedly. */
288
289 #define dead_open (d_open_t *)enxio
290 #define dead_close (d_close_t *)enxio
291 #define dead_read (d_read_t *)enxio
292 #define dead_write (d_write_t *)enxio
293 #define dead_ioctl (d_ioctl_t *)enxio
294 #define dead_poll (d_poll_t *)enodev
295 #define dead_mmap (d_mmap_t *)enodev
296
297 static void
298 dead_strategy(struct bio *bp)
299 {
300
301 biofinish(bp, NULL, ENXIO);
302 }
303
304 #define dead_dump (dumper_t *)enxio
305 #define dead_kqfilter (d_kqfilter_t *)enxio
306 #define dead_mmap_single (d_mmap_single_t *)enodev
307
308 static struct cdevsw dead_cdevsw = {
309 .d_version = D_VERSION,
310 .d_open = dead_open,
311 .d_close = dead_close,
312 .d_read = dead_read,
313 .d_write = dead_write,
314 .d_ioctl = dead_ioctl,
315 .d_poll = dead_poll,
316 .d_mmap = dead_mmap,
317 .d_strategy = dead_strategy,
318 .d_name = "dead",
319 .d_dump = dead_dump,
320 .d_kqfilter = dead_kqfilter,
321 .d_mmap_single = dead_mmap_single
322 };
323
324 /* Default methods if driver does not specify method */
325
326 #define null_open (d_open_t *)nullop
327 #define null_close (d_close_t *)nullop
328 #define no_read (d_read_t *)enodev
329 #define no_write (d_write_t *)enodev
330 #define no_ioctl (d_ioctl_t *)enodev
331 #define no_mmap (d_mmap_t *)enodev
332 #define no_kqfilter (d_kqfilter_t *)enodev
333 #define no_mmap_single (d_mmap_single_t *)enodev
334
335 static void
336 no_strategy(struct bio *bp)
337 {
338
339 biofinish(bp, NULL, ENODEV);
340 }
341
342 static int
343 no_poll(struct cdev *dev __unused, int events, struct thread *td __unused)
344 {
345
346 return (poll_no_poll(events));
347 }
348
349 #define no_dump (dumper_t *)enodev
350
351 static int
352 giant_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
353 {
354 struct cdevsw *dsw;
355 int ref, retval;
356
357 dsw = dev_refthread(dev, &ref);
358 if (dsw == NULL)
359 return (ENXIO);
360 mtx_lock(&Giant);
361 retval = dsw->d_gianttrick->d_open(dev, oflags, devtype, td);
362 mtx_unlock(&Giant);
363 dev_relthread(dev, ref);
364 return (retval);
365 }
366
367 static int
368 giant_fdopen(struct cdev *dev, int oflags, struct thread *td, struct file *fp)
369 {
370 struct cdevsw *dsw;
371 int ref, retval;
372
373 dsw = dev_refthread(dev, &ref);
374 if (dsw == NULL)
375 return (ENXIO);
376 mtx_lock(&Giant);
377 retval = dsw->d_gianttrick->d_fdopen(dev, oflags, td, fp);
378 mtx_unlock(&Giant);
379 dev_relthread(dev, ref);
380 return (retval);
381 }
382
383 static int
384 giant_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
385 {
386 struct cdevsw *dsw;
387 int ref, retval;
388
389 dsw = dev_refthread(dev, &ref);
390 if (dsw == NULL)
391 return (ENXIO);
392 mtx_lock(&Giant);
393 retval = dsw->d_gianttrick->d_close(dev, fflag, devtype, td);
394 mtx_unlock(&Giant);
395 dev_relthread(dev, ref);
396 return (retval);
397 }
398
399 static void
400 giant_strategy(struct bio *bp)
401 {
402 struct cdevsw *dsw;
403 struct cdev *dev;
404 int ref;
405
406 dev = bp->bio_dev;
407 dsw = dev_refthread(dev, &ref);
408 if (dsw == NULL) {
409 biofinish(bp, NULL, ENXIO);
410 return;
411 }
412 mtx_lock(&Giant);
413 dsw->d_gianttrick->d_strategy(bp);
414 mtx_unlock(&Giant);
415 dev_relthread(dev, ref);
416 }
417
418 static int
419 giant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
420 {
421 struct cdevsw *dsw;
422 int ref, retval;
423
424 dsw = dev_refthread(dev, &ref);
425 if (dsw == NULL)
426 return (ENXIO);
427 mtx_lock(&Giant);
428 retval = dsw->d_gianttrick->d_ioctl(dev, cmd, data, fflag, td);
429 mtx_unlock(&Giant);
430 dev_relthread(dev, ref);
431 return (retval);
432 }
433
434 static int
435 giant_read(struct cdev *dev, struct uio *uio, int ioflag)
436 {
437 struct cdevsw *dsw;
438 int ref, retval;
439
440 dsw = dev_refthread(dev, &ref);
441 if (dsw == NULL)
442 return (ENXIO);
443 mtx_lock(&Giant);
444 retval = dsw->d_gianttrick->d_read(dev, uio, ioflag);
445 mtx_unlock(&Giant);
446 dev_relthread(dev, ref);
447 return (retval);
448 }
449
450 static int
451 giant_write(struct cdev *dev, struct uio *uio, int ioflag)
452 {
453 struct cdevsw *dsw;
454 int ref, retval;
455
456 dsw = dev_refthread(dev, &ref);
457 if (dsw == NULL)
458 return (ENXIO);
459 mtx_lock(&Giant);
460 retval = dsw->d_gianttrick->d_write(dev, uio, ioflag);
461 mtx_unlock(&Giant);
462 dev_relthread(dev, ref);
463 return (retval);
464 }
465
466 static int
467 giant_poll(struct cdev *dev, int events, struct thread *td)
468 {
469 struct cdevsw *dsw;
470 int ref, retval;
471
472 dsw = dev_refthread(dev, &ref);
473 if (dsw == NULL)
474 return (ENXIO);
475 mtx_lock(&Giant);
476 retval = dsw->d_gianttrick->d_poll(dev, events, td);
477 mtx_unlock(&Giant);
478 dev_relthread(dev, ref);
479 return (retval);
480 }
481
482 static int
483 giant_kqfilter(struct cdev *dev, struct knote *kn)
484 {
485 struct cdevsw *dsw;
486 int ref, retval;
487
488 dsw = dev_refthread(dev, &ref);
489 if (dsw == NULL)
490 return (ENXIO);
491 mtx_lock(&Giant);
492 retval = dsw->d_gianttrick->d_kqfilter(dev, kn);
493 mtx_unlock(&Giant);
494 dev_relthread(dev, ref);
495 return (retval);
496 }
497
498 static int
499 giant_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot,
500 vm_memattr_t *memattr)
501 {
502 struct cdevsw *dsw;
503 int ref, retval;
504
505 dsw = dev_refthread(dev, &ref);
506 if (dsw == NULL)
507 return (ENXIO);
508 mtx_lock(&Giant);
509 retval = dsw->d_gianttrick->d_mmap(dev, offset, paddr, nprot,
510 memattr);
511 mtx_unlock(&Giant);
512 dev_relthread(dev, ref);
513 return (retval);
514 }
515
516 static int
517 giant_mmap_single(struct cdev *dev, vm_ooffset_t *offset, vm_size_t size,
518 vm_object_t *object, int nprot)
519 {
520 struct cdevsw *dsw;
521 int ref, retval;
522
523 dsw = dev_refthread(dev, &ref);
524 if (dsw == NULL)
525 return (ENXIO);
526 mtx_lock(&Giant);
527 retval = dsw->d_gianttrick->d_mmap_single(dev, offset, size, object,
528 nprot);
529 mtx_unlock(&Giant);
530 dev_relthread(dev, ref);
531 return (retval);
532 }
533
534 static void
535 notify(struct cdev *dev, const char *ev, int flags)
536 {
537 static const char prefix[] = "cdev=";
538 char *data;
539 int namelen, mflags;
540
541 if (cold)
542 return;
543 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK;
544 namelen = strlen(dev->si_name);
545 data = malloc(namelen + sizeof(prefix), M_TEMP, mflags);
546 if (data == NULL)
547 return;
548 memcpy(data, prefix, sizeof(prefix) - 1);
549 memcpy(data + sizeof(prefix) - 1, dev->si_name, namelen + 1);
550 devctl_notify_f("DEVFS", "CDEV", ev, data, mflags);
551 free(data, M_TEMP);
552 }
553
554 static void
555 notify_create(struct cdev *dev, int flags)
556 {
557
558 notify(dev, "CREATE", flags);
559 }
560
561 static void
562 notify_destroy(struct cdev *dev)
563 {
564
565 notify(dev, "DESTROY", MAKEDEV_WAITOK);
566 }
567
568 static struct cdev *
569 newdev(struct cdevsw *csw, int unit, struct cdev *si)
570 {
571 struct cdev *si2;
572
573 mtx_assert(&devmtx, MA_OWNED);
574 if (csw->d_flags & D_NEEDMINOR) {
575 /* We may want to return an existing device */
576 LIST_FOREACH(si2, &csw->d_devs, si_list) {
577 if (dev2unit(si2) == unit) {
578 dev_free_devlocked(si);
579 return (si2);
580 }
581 }
582 }
583 si->si_drv0 = unit;
584 si->si_devsw = csw;
585 LIST_INSERT_HEAD(&csw->d_devs, si, si_list);
586 return (si);
587 }
588
589 static void
590 fini_cdevsw(struct cdevsw *devsw)
591 {
592 struct cdevsw *gt;
593
594 if (devsw->d_gianttrick != NULL) {
595 gt = devsw->d_gianttrick;
596 memcpy(devsw, gt, sizeof *devsw);
597 cdevsw_free_devlocked(gt);
598 devsw->d_gianttrick = NULL;
599 }
600 devsw->d_flags &= ~D_INIT;
601 }
602
603 static int
604 prep_cdevsw(struct cdevsw *devsw, int flags)
605 {
606 struct cdevsw *dsw2;
607
608 mtx_assert(&devmtx, MA_OWNED);
609 if (devsw->d_flags & D_INIT)
610 return (0);
611 if (devsw->d_flags & D_NEEDGIANT) {
612 dev_unlock();
613 dsw2 = malloc(sizeof *dsw2, M_DEVT,
614 (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK);
615 dev_lock();
616 if (dsw2 == NULL && !(devsw->d_flags & D_INIT))
617 return (ENOMEM);
618 } else
619 dsw2 = NULL;
620 if (devsw->d_flags & D_INIT) {
621 if (dsw2 != NULL)
622 cdevsw_free_devlocked(dsw2);
623 return (0);
624 }
625
626 if (devsw->d_version != D_VERSION_03) {
627 printf(
628 "WARNING: Device driver \"%s\" has wrong version %s\n",
629 devsw->d_name == NULL ? "???" : devsw->d_name,
630 "and is disabled. Recompile KLD module.");
631 devsw->d_open = dead_open;
632 devsw->d_close = dead_close;
633 devsw->d_read = dead_read;
634 devsw->d_write = dead_write;
635 devsw->d_ioctl = dead_ioctl;
636 devsw->d_poll = dead_poll;
637 devsw->d_mmap = dead_mmap;
638 devsw->d_mmap_single = dead_mmap_single;
639 devsw->d_strategy = dead_strategy;
640 devsw->d_dump = dead_dump;
641 devsw->d_kqfilter = dead_kqfilter;
642 }
643
644 if (devsw->d_flags & D_NEEDGIANT) {
645 if (devsw->d_gianttrick == NULL) {
646 memcpy(dsw2, devsw, sizeof *dsw2);
647 devsw->d_gianttrick = dsw2;
648 dsw2 = NULL;
649 }
650 }
651
652 #define FIXUP(member, noop, giant) \
653 do { \
654 if (devsw->member == NULL) { \
655 devsw->member = noop; \
656 } else if (devsw->d_flags & D_NEEDGIANT) \
657 devsw->member = giant; \
658 } \
659 while (0)
660
661 FIXUP(d_open, null_open, giant_open);
662 FIXUP(d_fdopen, NULL, giant_fdopen);
663 FIXUP(d_close, null_close, giant_close);
664 FIXUP(d_read, no_read, giant_read);
665 FIXUP(d_write, no_write, giant_write);
666 FIXUP(d_ioctl, no_ioctl, giant_ioctl);
667 FIXUP(d_poll, no_poll, giant_poll);
668 FIXUP(d_mmap, no_mmap, giant_mmap);
669 FIXUP(d_strategy, no_strategy, giant_strategy);
670 FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter);
671 FIXUP(d_mmap_single, no_mmap_single, giant_mmap_single);
672
673 if (devsw->d_dump == NULL) devsw->d_dump = no_dump;
674
675 LIST_INIT(&devsw->d_devs);
676
677 devsw->d_flags |= D_INIT;
678
679 if (dsw2 != NULL)
680 cdevsw_free_devlocked(dsw2);
681 return (0);
682 }
683
684 static int
685 prep_devname(struct cdev *dev, const char *fmt, va_list ap)
686 {
687 int len;
688 char *from, *q, *s, *to;
689
690 mtx_assert(&devmtx, MA_OWNED);
691
692 len = vsnrprintf(dev->si_name, sizeof(dev->si_name), 32, fmt, ap);
693 if (len > sizeof(dev->si_name) - 1)
694 return (ENAMETOOLONG);
695
696 /* Strip leading slashes. */
697 for (from = dev->si_name; *from == '/'; from++)
698 ;
699
700 for (to = dev->si_name; *from != '\0'; from++, to++) {
701 /*
702 * Spaces and double quotation marks cause
703 * problems for the devctl(4) protocol.
704 * Reject names containing those characters.
705 */
706 if (isspace(*from) || *from == '"')
707 return (EINVAL);
708 /* Treat multiple sequential slashes as single. */
709 while (from[0] == '/' && from[1] == '/')
710 from++;
711 /* Trailing slash is considered invalid. */
712 if (from[0] == '/' && from[1] == '\0')
713 return (EINVAL);
714 *to = *from;
715 }
716 *to = '\0';
717
718 if (dev->si_name[0] == '\0')
719 return (EINVAL);
720
721 /* Disallow "." and ".." components. */
722 for (s = dev->si_name;;) {
723 for (q = s; *q != '/' && *q != '\0'; q++)
724 ;
725 if (q - s == 1 && s[0] == '.')
726 return (EINVAL);
727 if (q - s == 2 && s[0] == '.' && s[1] == '.')
728 return (EINVAL);
729 if (*q != '/')
730 break;
731 s = q + 1;
732 }
733
734 if (devfs_dev_exists(dev->si_name) != 0)
735 return (EEXIST);
736
737 return (0);
738 }
739
740 static int
741 make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, int unit,
742 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt,
743 va_list ap)
744 {
745 struct cdev *dev, *dev_new;
746 int res;
747
748 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0,
749 ("make_dev_credv: both WAITOK and NOWAIT specified"));
750 dev_new = devfs_alloc(flags);
751 if (dev_new == NULL)
752 return (ENOMEM);
753 dev_lock();
754 res = prep_cdevsw(devsw, flags);
755 if (res != 0) {
756 dev_unlock();
757 devfs_free(dev_new);
758 return (res);
759 }
760 dev = newdev(devsw, unit, dev_new);
761 if ((dev->si_flags & SI_NAMED) == 0) {
762 res = prep_devname(dev, fmt, ap);
763 if (res != 0) {
764 if ((flags & MAKEDEV_CHECKNAME) == 0) {
765 panic(
766 "make_dev_credv: bad si_name (error=%d, si_name=%s)",
767 res, dev->si_name);
768 }
769 if (dev == dev_new) {
770 LIST_REMOVE(dev, si_list);
771 dev_unlock();
772 devfs_free(dev);
773 } else
774 dev_unlock();
775 return (res);
776 }
777 }
778 if (flags & MAKEDEV_REF)
779 dev_refl(dev);
780 if (flags & MAKEDEV_ETERNAL)
781 dev->si_flags |= SI_ETERNAL;
782 if (dev->si_flags & SI_CHEAPCLONE &&
783 dev->si_flags & SI_NAMED) {
784 /*
785 * This is allowed as it removes races and generally
786 * simplifies cloning devices.
787 * XXX: still ??
788 */
789 dev_unlock_and_free();
790 *dres = dev;
791 return (0);
792 }
793 KASSERT(!(dev->si_flags & SI_NAMED),
794 ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)",
795 devsw->d_name, dev2unit(dev), devtoname(dev)));
796 dev->si_flags |= SI_NAMED;
797 if (cr != NULL)
798 dev->si_cred = crhold(cr);
799 dev->si_uid = uid;
800 dev->si_gid = gid;
801 dev->si_mode = mode;
802
803 devfs_create(dev);
804 clean_unrhdrl(devfs_inos);
805 dev_unlock_and_free();
806
807 notify_create(dev, flags);
808
809 *dres = dev;
810 return (0);
811 }
812
813 struct cdev *
814 make_dev(struct cdevsw *devsw, int unit, uid_t uid, gid_t gid, int mode,
815 const char *fmt, ...)
816 {
817 struct cdev *dev;
818 va_list ap;
819 int res;
820
821 va_start(ap, fmt);
822 res = make_dev_credv(0, &dev, devsw, unit, NULL, uid, gid, mode, fmt,
823 ap);
824 va_end(ap);
825 KASSERT(res == 0 && dev != NULL,
826 ("make_dev: failed make_dev_credv (error=%d)", res));
827 return (dev);
828 }
829
830 struct cdev *
831 make_dev_cred(struct cdevsw *devsw, int unit, struct ucred *cr, uid_t uid,
832 gid_t gid, int mode, const char *fmt, ...)
833 {
834 struct cdev *dev;
835 va_list ap;
836 int res;
837
838 va_start(ap, fmt);
839 res = make_dev_credv(0, &dev, devsw, unit, cr, uid, gid, mode, fmt, ap);
840 va_end(ap);
841
842 KASSERT(res == 0 && dev != NULL,
843 ("make_dev_cred: failed make_dev_credv (error=%d)", res));
844 return (dev);
845 }
846
847 struct cdev *
848 make_dev_credf(int flags, struct cdevsw *devsw, int unit, struct ucred *cr,
849 uid_t uid, gid_t gid, int mode, const char *fmt, ...)
850 {
851 struct cdev *dev;
852 va_list ap;
853 int res;
854
855 va_start(ap, fmt);
856 res = make_dev_credv(flags, &dev, devsw, unit, cr, uid, gid, mode,
857 fmt, ap);
858 va_end(ap);
859
860 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) ||
861 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0,
862 ("make_dev_credf: failed make_dev_credv (error=%d)", res));
863 return (res == 0 ? dev : NULL);
864 }
865
866 int
867 make_dev_p(int flags, struct cdev **cdev, struct cdevsw *devsw,
868 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, ...)
869 {
870 va_list ap;
871 int res;
872
873 va_start(ap, fmt);
874 res = make_dev_credv(flags, cdev, devsw, 0, cr, uid, gid, mode,
875 fmt, ap);
876 va_end(ap);
877
878 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) ||
879 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0,
880 ("make_dev_p: failed make_dev_credv (error=%d)", res));
881 return (res);
882 }
883
884 static void
885 dev_dependsl(struct cdev *pdev, struct cdev *cdev)
886 {
887
888 cdev->si_parent = pdev;
889 cdev->si_flags |= SI_CHILD;
890 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings);
891 }
892
893
894 void
895 dev_depends(struct cdev *pdev, struct cdev *cdev)
896 {
897
898 dev_lock();
899 dev_dependsl(pdev, cdev);
900 dev_unlock();
901 }
902
903 static int
904 make_dev_alias_v(int flags, struct cdev **cdev, struct cdev *pdev,
905 const char *fmt, va_list ap)
906 {
907 struct cdev *dev;
908 int error;
909
910 KASSERT(pdev != NULL, ("make_dev_alias_v: pdev is NULL"));
911 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0,
912 ("make_dev_alias_v: both WAITOK and NOWAIT specified"));
913 KASSERT((flags & ~(MAKEDEV_WAITOK | MAKEDEV_NOWAIT |
914 MAKEDEV_CHECKNAME)) == 0,
915 ("make_dev_alias_v: invalid flags specified (flags=%02x)", flags));
916
917 dev = devfs_alloc(flags);
918 if (dev == NULL)
919 return (ENOMEM);
920 dev_lock();
921 dev->si_flags |= SI_ALIAS;
922 error = prep_devname(dev, fmt, ap);
923 if (error != 0) {
924 if ((flags & MAKEDEV_CHECKNAME) == 0) {
925 panic("make_dev_alias_v: bad si_name "
926 "(error=%d, si_name=%s)", error, dev->si_name);
927 }
928 dev_unlock();
929 devfs_free(dev);
930 return (error);
931 }
932 dev->si_flags |= SI_NAMED;
933 devfs_create(dev);
934 dev_dependsl(pdev, dev);
935 clean_unrhdrl(devfs_inos);
936 dev_unlock();
937
938 notify_create(dev, flags);
939 *cdev = dev;
940
941 return (0);
942 }
943
944 struct cdev *
945 make_dev_alias(struct cdev *pdev, const char *fmt, ...)
946 {
947 struct cdev *dev;
948 va_list ap;
949 int res;
950
951 va_start(ap, fmt);
952 res = make_dev_alias_v(MAKEDEV_WAITOK, &dev, pdev, fmt, ap);
953 va_end(ap);
954
955 KASSERT(res == 0 && dev != NULL,
956 ("make_dev_alias: failed make_dev_alias_v (error=%d)", res));
957 return (dev);
958 }
959
960 int
961 make_dev_alias_p(int flags, struct cdev **cdev, struct cdev *pdev,
962 const char *fmt, ...)
963 {
964 va_list ap;
965 int res;
966
967 va_start(ap, fmt);
968 res = make_dev_alias_v(flags, cdev, pdev, fmt, ap);
969 va_end(ap);
970 return (res);
971 }
972
973 int
974 make_dev_physpath_alias(int flags, struct cdev **cdev, struct cdev *pdev,
975 struct cdev *old_alias, const char *physpath)
976 {
977 char *devfspath;
978 int physpath_len;
979 int max_parentpath_len;
980 int parentpath_len;
981 int devfspathbuf_len;
982 int mflags;
983 int ret;
984
985 *cdev = NULL;
986 devfspath = NULL;
987 physpath_len = strlen(physpath);
988 ret = EINVAL;
989 if (physpath_len == 0)
990 goto out;
991
992 if (strncmp("id1,", physpath, 4) == 0) {
993 physpath += 4;
994 physpath_len -= 4;
995 if (physpath_len == 0)
996 goto out;
997 }
998
999 max_parentpath_len = SPECNAMELEN - physpath_len - /*/*/1;
1000 parentpath_len = strlen(pdev->si_name);
1001 if (max_parentpath_len < parentpath_len) {
1002 if (bootverbose)
1003 printf("WARNING: Unable to alias %s "
1004 "to %s/%s - path too long\n",
1005 pdev->si_name, physpath, pdev->si_name);
1006 ret = ENAMETOOLONG;
1007 goto out;
1008 }
1009
1010 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK;
1011 devfspathbuf_len = physpath_len + /*/*/1 + parentpath_len + /*NUL*/1;
1012 devfspath = malloc(devfspathbuf_len, M_DEVBUF, mflags);
1013 if (devfspath == NULL) {
1014 ret = ENOMEM;
1015 goto out;
1016 }
1017
1018 sprintf(devfspath, "%s/%s", physpath, pdev->si_name);
1019 if (old_alias != NULL && strcmp(old_alias->si_name, devfspath) == 0) {
1020 /* Retain the existing alias. */
1021 *cdev = old_alias;
1022 old_alias = NULL;
1023 ret = 0;
1024 } else {
1025 ret = make_dev_alias_p(flags, cdev, pdev, "%s", devfspath);
1026 }
1027 out:
1028 if (old_alias != NULL)
1029 destroy_dev(old_alias);
1030 if (devfspath != NULL)
1031 free(devfspath, M_DEVBUF);
1032 return (ret);
1033 }
1034
1035 static void
1036 destroy_devl(struct cdev *dev)
1037 {
1038 struct cdevsw *csw;
1039 struct cdev_privdata *p;
1040 struct cdev_priv *cdp;
1041
1042 mtx_assert(&devmtx, MA_OWNED);
1043 KASSERT(dev->si_flags & SI_NAMED,
1044 ("WARNING: Driver mistake: destroy_dev on %d\n", dev2unit(dev)));
1045 KASSERT((dev->si_flags & SI_ETERNAL) == 0,
1046 ("WARNING: Driver mistake: destroy_dev on eternal %d\n",
1047 dev2unit(dev)));
1048
1049 cdp = cdev2priv(dev);
1050 if ((cdp->cdp_flags & CDP_UNREF_DTR) == 0) {
1051 /*
1052 * Avoid race with dev_rel(), e.g. from the populate
1053 * loop. If CDP_UNREF_DTR flag is set, the reference
1054 * to be dropped at the end of destroy_devl() was
1055 * already taken by delist_dev_locked().
1056 */
1057 dev_refl(dev);
1058
1059 devfs_destroy(dev);
1060 }
1061
1062 /* Remove name marking */
1063 dev->si_flags &= ~SI_NAMED;
1064
1065 /* If we are a child, remove us from the parents list */
1066 if (dev->si_flags & SI_CHILD) {
1067 LIST_REMOVE(dev, si_siblings);
1068 dev->si_flags &= ~SI_CHILD;
1069 }
1070
1071 /* Kill our children */
1072 while (!LIST_EMPTY(&dev->si_children))
1073 destroy_devl(LIST_FIRST(&dev->si_children));
1074
1075 /* Remove from clone list */
1076 if (dev->si_flags & SI_CLONELIST) {
1077 LIST_REMOVE(dev, si_clone);
1078 dev->si_flags &= ~SI_CLONELIST;
1079 }
1080
1081 csw = dev->si_devsw;
1082 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */
1083 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) {
1084 csw->d_purge(dev);
1085 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10);
1086 if (dev->si_threadcount)
1087 printf("Still %lu threads in %s\n",
1088 dev->si_threadcount, devtoname(dev));
1089 }
1090 while (dev->si_threadcount != 0) {
1091 /* Use unique dummy wait ident */
1092 msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10);
1093 }
1094
1095 dev_unlock();
1096 if ((cdp->cdp_flags & CDP_UNREF_DTR) == 0) {
1097 /* avoid out of order notify events */
1098 notify_destroy(dev);
1099 }
1100 mtx_lock(&cdevpriv_mtx);
1101 while ((p = LIST_FIRST(&cdp->cdp_fdpriv)) != NULL) {
1102 devfs_destroy_cdevpriv(p);
1103 mtx_lock(&cdevpriv_mtx);
1104 }
1105 mtx_unlock(&cdevpriv_mtx);
1106 dev_lock();
1107
1108 dev->si_drv1 = 0;
1109 dev->si_drv2 = 0;
1110 bzero(&dev->__si_u, sizeof(dev->__si_u));
1111
1112 if (!(dev->si_flags & SI_ALIAS)) {
1113 /* Remove from cdevsw list */
1114 LIST_REMOVE(dev, si_list);
1115
1116 /* If cdevsw has no more struct cdev *'s, clean it */
1117 if (LIST_EMPTY(&csw->d_devs)) {
1118 fini_cdevsw(csw);
1119 wakeup(&csw->d_devs);
1120 }
1121 }
1122 dev->si_flags &= ~SI_ALIAS;
1123 cdp->cdp_flags &= ~CDP_UNREF_DTR;
1124 dev->si_refcount--;
1125
1126 if (dev->si_refcount > 0)
1127 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list);
1128 else
1129 dev_free_devlocked(dev);
1130 }
1131
1132 static void
1133 delist_dev_locked(struct cdev *dev)
1134 {
1135 struct cdev_priv *cdp;
1136 struct cdev *child;
1137
1138 mtx_assert(&devmtx, MA_OWNED);
1139 cdp = cdev2priv(dev);
1140 if ((cdp->cdp_flags & CDP_UNREF_DTR) != 0)
1141 return;
1142 cdp->cdp_flags |= CDP_UNREF_DTR;
1143 dev_refl(dev);
1144 devfs_destroy(dev);
1145 LIST_FOREACH(child, &dev->si_children, si_siblings)
1146 delist_dev_locked(child);
1147 dev_unlock();
1148 /* ensure the destroy event is queued in order */
1149 notify_destroy(dev);
1150 dev_lock();
1151 }
1152
1153 /*
1154 * This function will delist a character device and its children from
1155 * the directory listing and create a destroy event without waiting
1156 * for all character device references to go away. At some later point
1157 * destroy_dev() must be called to complete the character device
1158 * destruction. After calling this function the character device name
1159 * can instantly be re-used.
1160 */
1161 void
1162 delist_dev(struct cdev *dev)
1163 {
1164
1165 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "delist_dev");
1166 dev_lock();
1167 delist_dev_locked(dev);
1168 dev_unlock();
1169 }
1170
1171 void
1172 destroy_dev(struct cdev *dev)
1173 {
1174
1175 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "destroy_dev");
1176 dev_lock();
1177 destroy_devl(dev);
1178 dev_unlock_and_free();
1179 }
1180
1181 const char *
1182 devtoname(struct cdev *dev)
1183 {
1184
1185 return (dev->si_name);
1186 }
1187
1188 int
1189 dev_stdclone(char *name, char **namep, const char *stem, int *unit)
1190 {
1191 int u, i;
1192
1193 i = strlen(stem);
1194 if (bcmp(stem, name, i) != 0)
1195 return (0);
1196 if (!isdigit(name[i]))
1197 return (0);
1198 u = 0;
1199 if (name[i] == '' && isdigit(name[i+1]))
1200 return (0);
1201 while (isdigit(name[i])) {
1202 u *= 10;
1203 u += name[i++] - '';
1204 }
1205 if (u > 0xffffff)
1206 return (0);
1207 *unit = u;
1208 if (namep)
1209 *namep = &name[i];
1210 if (name[i])
1211 return (2);
1212 return (1);
1213 }
1214
1215 /*
1216 * Helper functions for cloning device drivers.
1217 *
1218 * The objective here is to make it unnecessary for the device drivers to
1219 * use rman or similar to manage their unit number space. Due to the way
1220 * we do "on-demand" devices, using rman or other "private" methods
1221 * will be very tricky to lock down properly once we lock down this file.
1222 *
1223 * Instead we give the drivers these routines which puts the struct cdev *'s
1224 * that are to be managed on their own list, and gives the driver the ability
1225 * to ask for the first free unit number or a given specified unit number.
1226 *
1227 * In addition these routines support paired devices (pty, nmdm and similar)
1228 * by respecting a number of "flag" bits in the minor number.
1229 *
1230 */
1231
1232 struct clonedevs {
1233 LIST_HEAD(,cdev) head;
1234 };
1235
1236 void
1237 clone_setup(struct clonedevs **cdp)
1238 {
1239
1240 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO);
1241 LIST_INIT(&(*cdp)->head);
1242 }
1243
1244 int
1245 clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up,
1246 struct cdev **dp, int extra)
1247 {
1248 struct clonedevs *cd;
1249 struct cdev *dev, *ndev, *dl, *de;
1250 int unit, low, u;
1251
1252 KASSERT(*cdp != NULL,
1253 ("clone_setup() not called in driver \"%s\"", csw->d_name));
1254 KASSERT(!(extra & CLONE_UNITMASK),
1255 ("Illegal extra bits (0x%x) in clone_create", extra));
1256 KASSERT(*up <= CLONE_UNITMASK,
1257 ("Too high unit (0x%x) in clone_create", *up));
1258 KASSERT(csw->d_flags & D_NEEDMINOR,
1259 ("clone_create() on cdevsw without minor numbers"));
1260
1261
1262 /*
1263 * Search the list for a lot of things in one go:
1264 * A preexisting match is returned immediately.
1265 * The lowest free unit number if we are passed -1, and the place
1266 * in the list where we should insert that new element.
1267 * The place to insert a specified unit number, if applicable
1268 * the end of the list.
1269 */
1270 unit = *up;
1271 ndev = devfs_alloc(MAKEDEV_WAITOK);
1272 dev_lock();
1273 prep_cdevsw(csw, MAKEDEV_WAITOK);
1274 low = extra;
1275 de = dl = NULL;
1276 cd = *cdp;
1277 LIST_FOREACH(dev, &cd->head, si_clone) {
1278 KASSERT(dev->si_flags & SI_CLONELIST,
1279 ("Dev %p(%s) should be on clonelist", dev, dev->si_name));
1280 u = dev2unit(dev);
1281 if (u == (unit | extra)) {
1282 *dp = dev;
1283 dev_unlock();
1284 devfs_free(ndev);
1285 return (0);
1286 }
1287 if (unit == -1 && u == low) {
1288 low++;
1289 de = dev;
1290 continue;
1291 } else if (u < (unit | extra)) {
1292 de = dev;
1293 continue;
1294 } else if (u > (unit | extra)) {
1295 dl = dev;
1296 break;
1297 }
1298 }
1299 if (unit == -1)
1300 unit = low & CLONE_UNITMASK;
1301 dev = newdev(csw, unit | extra, ndev);
1302 if (dev->si_flags & SI_CLONELIST) {
1303 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name);
1304 printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra);
1305 LIST_FOREACH(dev, &cd->head, si_clone) {
1306 printf("\t%p %s\n", dev, dev->si_name);
1307 }
1308 panic("foo");
1309 }
1310 KASSERT(!(dev->si_flags & SI_CLONELIST),
1311 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name));
1312 if (dl != NULL)
1313 LIST_INSERT_BEFORE(dl, dev, si_clone);
1314 else if (de != NULL)
1315 LIST_INSERT_AFTER(de, dev, si_clone);
1316 else
1317 LIST_INSERT_HEAD(&cd->head, dev, si_clone);
1318 dev->si_flags |= SI_CLONELIST;
1319 *up = unit;
1320 dev_unlock_and_free();
1321 return (1);
1322 }
1323
1324 /*
1325 * Kill everything still on the list. The driver should already have
1326 * disposed of any softc hung of the struct cdev *'s at this time.
1327 */
1328 void
1329 clone_cleanup(struct clonedevs **cdp)
1330 {
1331 struct cdev *dev;
1332 struct cdev_priv *cp;
1333 struct clonedevs *cd;
1334
1335 cd = *cdp;
1336 if (cd == NULL)
1337 return;
1338 dev_lock();
1339 while (!LIST_EMPTY(&cd->head)) {
1340 dev = LIST_FIRST(&cd->head);
1341 LIST_REMOVE(dev, si_clone);
1342 KASSERT(dev->si_flags & SI_CLONELIST,
1343 ("Dev %p(%s) should be on clonelist", dev, dev->si_name));
1344 dev->si_flags &= ~SI_CLONELIST;
1345 cp = cdev2priv(dev);
1346 if (!(cp->cdp_flags & CDP_SCHED_DTR)) {
1347 cp->cdp_flags |= CDP_SCHED_DTR;
1348 KASSERT(dev->si_flags & SI_NAMED,
1349 ("Driver has goofed in cloning underways udev %x unit %x", dev2udev(dev), dev2unit(dev)));
1350 destroy_devl(dev);
1351 }
1352 }
1353 dev_unlock_and_free();
1354 free(cd, M_DEVBUF);
1355 *cdp = NULL;
1356 }
1357
1358 static TAILQ_HEAD(, cdev_priv) dev_ddtr =
1359 TAILQ_HEAD_INITIALIZER(dev_ddtr);
1360 static struct task dev_dtr_task = TASK_INITIALIZER(0, destroy_dev_tq, NULL);
1361
1362 static void
1363 destroy_dev_tq(void *ctx, int pending)
1364 {
1365 struct cdev_priv *cp;
1366 struct cdev *dev;
1367 void (*cb)(void *);
1368 void *cb_arg;
1369
1370 dev_lock();
1371 while (!TAILQ_EMPTY(&dev_ddtr)) {
1372 cp = TAILQ_FIRST(&dev_ddtr);
1373 dev = &cp->cdp_c;
1374 KASSERT(cp->cdp_flags & CDP_SCHED_DTR,
1375 ("cdev %p in dev_destroy_tq without CDP_SCHED_DTR", cp));
1376 TAILQ_REMOVE(&dev_ddtr, cp, cdp_dtr_list);
1377 cb = cp->cdp_dtr_cb;
1378 cb_arg = cp->cdp_dtr_cb_arg;
1379 destroy_devl(dev);
1380 dev_unlock_and_free();
1381 dev_rel(dev);
1382 if (cb != NULL)
1383 cb(cb_arg);
1384 dev_lock();
1385 }
1386 dev_unlock();
1387 }
1388
1389 /*
1390 * devmtx shall be locked on entry. devmtx will be unlocked after
1391 * function return.
1392 */
1393 static int
1394 destroy_dev_sched_cbl(struct cdev *dev, void (*cb)(void *), void *arg)
1395 {
1396 struct cdev_priv *cp;
1397
1398 mtx_assert(&devmtx, MA_OWNED);
1399 cp = cdev2priv(dev);
1400 if (cp->cdp_flags & CDP_SCHED_DTR) {
1401 dev_unlock();
1402 return (0);
1403 }
1404 dev_refl(dev);
1405 cp->cdp_flags |= CDP_SCHED_DTR;
1406 cp->cdp_dtr_cb = cb;
1407 cp->cdp_dtr_cb_arg = arg;
1408 TAILQ_INSERT_TAIL(&dev_ddtr, cp, cdp_dtr_list);
1409 dev_unlock();
1410 taskqueue_enqueue(taskqueue_swi_giant, &dev_dtr_task);
1411 return (1);
1412 }
1413
1414 int
1415 destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg)
1416 {
1417
1418 dev_lock();
1419 return (destroy_dev_sched_cbl(dev, cb, arg));
1420 }
1421
1422 int
1423 destroy_dev_sched(struct cdev *dev)
1424 {
1425
1426 return (destroy_dev_sched_cb(dev, NULL, NULL));
1427 }
1428
1429 void
1430 destroy_dev_drain(struct cdevsw *csw)
1431 {
1432
1433 dev_lock();
1434 while (!LIST_EMPTY(&csw->d_devs)) {
1435 msleep(&csw->d_devs, &devmtx, PRIBIO, "devscd", hz/10);
1436 }
1437 dev_unlock();
1438 }
1439
1440 void
1441 drain_dev_clone_events(void)
1442 {
1443
1444 sx_xlock(&clone_drain_lock);
1445 sx_xunlock(&clone_drain_lock);
1446 }
1447
1448 #include "opt_ddb.h"
1449 #ifdef DDB
1450 #include <sys/kernel.h>
1451
1452 #include <ddb/ddb.h>
1453
1454 DB_SHOW_COMMAND(cdev, db_show_cdev)
1455 {
1456 struct cdev_priv *cdp;
1457 struct cdev *dev;
1458 u_int flags;
1459 char buf[512];
1460
1461 if (!have_addr) {
1462 TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) {
1463 dev = &cdp->cdp_c;
1464 db_printf("%s %p\n", dev->si_name, dev);
1465 if (db_pager_quit)
1466 break;
1467 }
1468 return;
1469 }
1470
1471 dev = (struct cdev *)addr;
1472 cdp = cdev2priv(dev);
1473 db_printf("dev %s ref %d use %ld thr %ld inuse %u fdpriv %p\n",
1474 dev->si_name, dev->si_refcount, dev->si_usecount,
1475 dev->si_threadcount, cdp->cdp_inuse, cdp->cdp_fdpriv.lh_first);
1476 db_printf("devsw %p si_drv0 %d si_drv1 %p si_drv2 %p\n",
1477 dev->si_devsw, dev->si_drv0, dev->si_drv1, dev->si_drv2);
1478 flags = dev->si_flags;
1479 #define SI_FLAG(flag) do { \
1480 if (flags & (flag)) { \
1481 if (buf[0] != '\0') \
1482 strlcat(buf, ", ", sizeof(buf)); \
1483 strlcat(buf, (#flag) + 3, sizeof(buf)); \
1484 flags &= ~(flag); \
1485 } \
1486 } while (0)
1487 buf[0] = '\0';
1488 SI_FLAG(SI_ETERNAL);
1489 SI_FLAG(SI_ALIAS);
1490 SI_FLAG(SI_NAMED);
1491 SI_FLAG(SI_CHEAPCLONE);
1492 SI_FLAG(SI_CHILD);
1493 SI_FLAG(SI_DUMPDEV);
1494 SI_FLAG(SI_CLONELIST);
1495 db_printf("si_flags %s\n", buf);
1496
1497 flags = cdp->cdp_flags;
1498 #define CDP_FLAG(flag) do { \
1499 if (flags & (flag)) { \
1500 if (buf[0] != '\0') \
1501 strlcat(buf, ", ", sizeof(buf)); \
1502 strlcat(buf, (#flag) + 4, sizeof(buf)); \
1503 flags &= ~(flag); \
1504 } \
1505 } while (0)
1506 buf[0] = '\0';
1507 CDP_FLAG(CDP_ACTIVE);
1508 CDP_FLAG(CDP_SCHED_DTR);
1509 db_printf("cdp_flags %s\n", buf);
1510 }
1511 #endif
Cache object: 2ab154582913cf7b1804d0af9ce1e2ba
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