forked from opnsense/src
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathkern_conf.c
1566 lines (1368 loc) · 35.4 KB
/
kern_conf.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 1999-2002 Poul-Henning Kamp
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/bio.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/conf.h>
#include <sys/vnode.h>
#include <sys/queue.h>
#include <sys/poll.h>
#include <sys/sx.h>
#include <sys/ctype.h>
#include <sys/ucred.h>
#include <sys/taskqueue.h>
#include <machine/stdarg.h>
#include <fs/devfs/devfs_int.h>
#include <vm/vm.h>
static MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage");
struct mtx devmtx;
static void destroy_devl(struct cdev *dev);
static int destroy_dev_sched_cbl(struct cdev *dev,
void (*cb)(void *), void *arg);
static void destroy_dev_tq(void *ctx, int pending);
static int make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw,
int unit, struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt,
va_list ap);
static struct cdev_priv_list cdevp_free_list =
TAILQ_HEAD_INITIALIZER(cdevp_free_list);
static SLIST_HEAD(free_cdevsw, cdevsw) cdevsw_gt_post_list =
SLIST_HEAD_INITIALIZER(cdevsw_gt_post_list);
void
dev_lock(void)
{
mtx_lock(&devmtx);
}
/*
* Free all the memory collected while the cdev mutex was
* locked. Since devmtx is after the system map mutex, free() cannot
* be called immediately and is postponed until cdev mutex can be
* dropped.
*/
static void
dev_unlock_and_free(void)
{
struct cdev_priv_list cdp_free;
struct free_cdevsw csw_free;
struct cdev_priv *cdp;
struct cdevsw *csw;
mtx_assert(&devmtx, MA_OWNED);
/*
* Make the local copy of the list heads while the dev_mtx is
* held. Free it later.
*/
TAILQ_INIT(&cdp_free);
TAILQ_CONCAT(&cdp_free, &cdevp_free_list, cdp_list);
csw_free = cdevsw_gt_post_list;
SLIST_INIT(&cdevsw_gt_post_list);
mtx_unlock(&devmtx);
while ((cdp = TAILQ_FIRST(&cdp_free)) != NULL) {
TAILQ_REMOVE(&cdp_free, cdp, cdp_list);
devfs_free(&cdp->cdp_c);
}
while ((csw = SLIST_FIRST(&csw_free)) != NULL) {
SLIST_REMOVE_HEAD(&csw_free, d_postfree_list);
free(csw, M_DEVT);
}
}
static void
dev_free_devlocked(struct cdev *cdev)
{
struct cdev_priv *cdp;
mtx_assert(&devmtx, MA_OWNED);
cdp = cdev2priv(cdev);
KASSERT((cdp->cdp_flags & CDP_UNREF_DTR) == 0,
("destroy_dev() was not called after delist_dev(%p)", cdev));
TAILQ_INSERT_HEAD(&cdevp_free_list, cdp, cdp_list);
}
static void
cdevsw_free_devlocked(struct cdevsw *csw)
{
mtx_assert(&devmtx, MA_OWNED);
SLIST_INSERT_HEAD(&cdevsw_gt_post_list, csw, d_postfree_list);
}
void
dev_unlock(void)
{
mtx_unlock(&devmtx);
}
void
dev_ref(struct cdev *dev)
{
mtx_assert(&devmtx, MA_NOTOWNED);
mtx_lock(&devmtx);
dev->si_refcount++;
mtx_unlock(&devmtx);
}
void
dev_refl(struct cdev *dev)
{
mtx_assert(&devmtx, MA_OWNED);
dev->si_refcount++;
}
void
dev_rel(struct cdev *dev)
{
int flag = 0;
mtx_assert(&devmtx, MA_NOTOWNED);
dev_lock();
dev->si_refcount--;
KASSERT(dev->si_refcount >= 0,
("dev_rel(%s) gave negative count", devtoname(dev)));
#if 0
if (dev->si_usecount == 0 &&
(dev->si_flags & SI_CHEAPCLONE) && (dev->si_flags & SI_NAMED))
;
else
#endif
if (dev->si_devsw == NULL && dev->si_refcount == 0) {
LIST_REMOVE(dev, si_list);
flag = 1;
}
dev_unlock();
if (flag)
devfs_free(dev);
}
struct cdevsw *
dev_refthread(struct cdev *dev, int *ref)
{
struct cdevsw *csw;
struct cdev_priv *cdp;
mtx_assert(&devmtx, MA_NOTOWNED);
if ((dev->si_flags & SI_ETERNAL) != 0) {
*ref = 0;
return (dev->si_devsw);
}
dev_lock();
csw = dev->si_devsw;
if (csw != NULL) {
cdp = cdev2priv(dev);
if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0)
atomic_add_long(&dev->si_threadcount, 1);
else
csw = NULL;
}
dev_unlock();
*ref = 1;
return (csw);
}
struct cdevsw *
devvn_refthread(struct vnode *vp, struct cdev **devp, int *ref)
{
struct cdevsw *csw;
struct cdev_priv *cdp;
struct cdev *dev;
mtx_assert(&devmtx, MA_NOTOWNED);
if ((vp->v_vflag & VV_ETERNALDEV) != 0) {
dev = vp->v_rdev;
if (dev == NULL)
return (NULL);
KASSERT((dev->si_flags & SI_ETERNAL) != 0,
("Not eternal cdev"));
*ref = 0;
csw = dev->si_devsw;
KASSERT(csw != NULL, ("Eternal cdev is destroyed"));
*devp = dev;
return (csw);
}
csw = NULL;
dev_lock();
dev = vp->v_rdev;
if (dev == NULL) {
dev_unlock();
return (NULL);
}
cdp = cdev2priv(dev);
if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) {
csw = dev->si_devsw;
if (csw != NULL)
atomic_add_long(&dev->si_threadcount, 1);
}
dev_unlock();
if (csw != NULL) {
*devp = dev;
*ref = 1;
}
return (csw);
}
void
dev_relthread(struct cdev *dev, int ref)
{
mtx_assert(&devmtx, MA_NOTOWNED);
if (!ref)
return;
KASSERT(dev->si_threadcount > 0,
("%s threadcount is wrong", dev->si_name));
atomic_subtract_rel_long(&dev->si_threadcount, 1);
}
int
nullop(void)
{
return (0);
}
int
eopnotsupp(void)
{
return (EOPNOTSUPP);
}
static int
enxio(void)
{
return (ENXIO);
}
static int
enodev(void)
{
return (ENODEV);
}
/* Define a dead_cdevsw for use when devices leave unexpectedly. */
#define dead_open (d_open_t *)enxio
#define dead_close (d_close_t *)enxio
#define dead_read (d_read_t *)enxio
#define dead_write (d_write_t *)enxio
#define dead_ioctl (d_ioctl_t *)enxio
#define dead_poll (d_poll_t *)enodev
#define dead_mmap (d_mmap_t *)enodev
static void
dead_strategy(struct bio *bp)
{
biofinish(bp, NULL, ENXIO);
}
#define dead_dump (dumper_t *)enxio
#define dead_kqfilter (d_kqfilter_t *)enxio
#define dead_mmap_single (d_mmap_single_t *)enodev
static struct cdevsw dead_cdevsw = {
.d_version = D_VERSION,
.d_open = dead_open,
.d_close = dead_close,
.d_read = dead_read,
.d_write = dead_write,
.d_ioctl = dead_ioctl,
.d_poll = dead_poll,
.d_mmap = dead_mmap,
.d_strategy = dead_strategy,
.d_name = "dead",
.d_dump = dead_dump,
.d_kqfilter = dead_kqfilter,
.d_mmap_single = dead_mmap_single
};
/* Default methods if driver does not specify method */
#define null_open (d_open_t *)nullop
#define null_close (d_close_t *)nullop
#define no_read (d_read_t *)enodev
#define no_write (d_write_t *)enodev
#define no_ioctl (d_ioctl_t *)enodev
#define no_mmap (d_mmap_t *)enodev
#define no_kqfilter (d_kqfilter_t *)enodev
#define no_mmap_single (d_mmap_single_t *)enodev
static void
no_strategy(struct bio *bp)
{
biofinish(bp, NULL, ENODEV);
}
static int
no_poll(struct cdev *dev __unused, int events, struct thread *td __unused)
{
return (poll_no_poll(events));
}
#define no_dump (dumper_t *)enodev
static int
giant_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
{
struct cdevsw *dsw;
int ref, retval;
dsw = dev_refthread(dev, &ref);
if (dsw == NULL)
return (ENXIO);
mtx_lock(&Giant);
retval = dsw->d_gianttrick->d_open(dev, oflags, devtype, td);
mtx_unlock(&Giant);
dev_relthread(dev, ref);
return (retval);
}
static int
giant_fdopen(struct cdev *dev, int oflags, struct thread *td, struct file *fp)
{
struct cdevsw *dsw;
int ref, retval;
dsw = dev_refthread(dev, &ref);
if (dsw == NULL)
return (ENXIO);
mtx_lock(&Giant);
retval = dsw->d_gianttrick->d_fdopen(dev, oflags, td, fp);
mtx_unlock(&Giant);
dev_relthread(dev, ref);
return (retval);
}
static int
giant_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
{
struct cdevsw *dsw;
int ref, retval;
dsw = dev_refthread(dev, &ref);
if (dsw == NULL)
return (ENXIO);
mtx_lock(&Giant);
retval = dsw->d_gianttrick->d_close(dev, fflag, devtype, td);
mtx_unlock(&Giant);
dev_relthread(dev, ref);
return (retval);
}
static void
giant_strategy(struct bio *bp)
{
struct cdevsw *dsw;
struct cdev *dev;
int ref;
dev = bp->bio_dev;
dsw = dev_refthread(dev, &ref);
if (dsw == NULL) {
biofinish(bp, NULL, ENXIO);
return;
}
mtx_lock(&Giant);
dsw->d_gianttrick->d_strategy(bp);
mtx_unlock(&Giant);
dev_relthread(dev, ref);
}
static int
giant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
{
struct cdevsw *dsw;
int ref, retval;
dsw = dev_refthread(dev, &ref);
if (dsw == NULL)
return (ENXIO);
mtx_lock(&Giant);
retval = dsw->d_gianttrick->d_ioctl(dev, cmd, data, fflag, td);
mtx_unlock(&Giant);
dev_relthread(dev, ref);
return (retval);
}
static int
giant_read(struct cdev *dev, struct uio *uio, int ioflag)
{
struct cdevsw *dsw;
int ref, retval;
dsw = dev_refthread(dev, &ref);
if (dsw == NULL)
return (ENXIO);
mtx_lock(&Giant);
retval = dsw->d_gianttrick->d_read(dev, uio, ioflag);
mtx_unlock(&Giant);
dev_relthread(dev, ref);
return (retval);
}
static int
giant_write(struct cdev *dev, struct uio *uio, int ioflag)
{
struct cdevsw *dsw;
int ref, retval;
dsw = dev_refthread(dev, &ref);
if (dsw == NULL)
return (ENXIO);
mtx_lock(&Giant);
retval = dsw->d_gianttrick->d_write(dev, uio, ioflag);
mtx_unlock(&Giant);
dev_relthread(dev, ref);
return (retval);
}
static int
giant_poll(struct cdev *dev, int events, struct thread *td)
{
struct cdevsw *dsw;
int ref, retval;
dsw = dev_refthread(dev, &ref);
if (dsw == NULL)
return (ENXIO);
mtx_lock(&Giant);
retval = dsw->d_gianttrick->d_poll(dev, events, td);
mtx_unlock(&Giant);
dev_relthread(dev, ref);
return (retval);
}
static int
giant_kqfilter(struct cdev *dev, struct knote *kn)
{
struct cdevsw *dsw;
int ref, retval;
dsw = dev_refthread(dev, &ref);
if (dsw == NULL)
return (ENXIO);
mtx_lock(&Giant);
retval = dsw->d_gianttrick->d_kqfilter(dev, kn);
mtx_unlock(&Giant);
dev_relthread(dev, ref);
return (retval);
}
static int
giant_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot,
vm_memattr_t *memattr)
{
struct cdevsw *dsw;
int ref, retval;
dsw = dev_refthread(dev, &ref);
if (dsw == NULL)
return (ENXIO);
mtx_lock(&Giant);
retval = dsw->d_gianttrick->d_mmap(dev, offset, paddr, nprot,
memattr);
mtx_unlock(&Giant);
dev_relthread(dev, ref);
return (retval);
}
static int
giant_mmap_single(struct cdev *dev, vm_ooffset_t *offset, vm_size_t size,
vm_object_t *object, int nprot)
{
struct cdevsw *dsw;
int ref, retval;
dsw = dev_refthread(dev, &ref);
if (dsw == NULL)
return (ENXIO);
mtx_lock(&Giant);
retval = dsw->d_gianttrick->d_mmap_single(dev, offset, size, object,
nprot);
mtx_unlock(&Giant);
dev_relthread(dev, ref);
return (retval);
}
static void
notify(struct cdev *dev, const char *ev, int flags)
{
static const char prefix[] = "cdev=";
char *data;
int namelen, mflags;
if (cold)
return;
mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK;
namelen = strlen(dev->si_name);
data = malloc(namelen + sizeof(prefix), M_TEMP, mflags);
if (data == NULL)
return;
memcpy(data, prefix, sizeof(prefix) - 1);
memcpy(data + sizeof(prefix) - 1, dev->si_name, namelen + 1);
devctl_notify_f("DEVFS", "CDEV", ev, data, mflags);
free(data, M_TEMP);
}
static void
notify_create(struct cdev *dev, int flags)
{
notify(dev, "CREATE", flags);
}
static void
notify_destroy(struct cdev *dev)
{
notify(dev, "DESTROY", MAKEDEV_WAITOK);
}
static struct cdev *
newdev(struct make_dev_args *args, struct cdev *si)
{
struct cdev *si2;
struct cdevsw *csw;
mtx_assert(&devmtx, MA_OWNED);
csw = args->mda_devsw;
if (csw->d_flags & D_NEEDMINOR) {
/* We may want to return an existing device */
LIST_FOREACH(si2, &csw->d_devs, si_list) {
if (dev2unit(si2) == args->mda_unit) {
dev_free_devlocked(si);
return (si2);
}
}
}
si->si_drv0 = args->mda_unit;
si->si_devsw = csw;
si->si_drv1 = args->mda_si_drv1;
si->si_drv2 = args->mda_si_drv2;
LIST_INSERT_HEAD(&csw->d_devs, si, si_list);
return (si);
}
static void
fini_cdevsw(struct cdevsw *devsw)
{
struct cdevsw *gt;
if (devsw->d_gianttrick != NULL) {
gt = devsw->d_gianttrick;
memcpy(devsw, gt, sizeof *devsw);
cdevsw_free_devlocked(gt);
devsw->d_gianttrick = NULL;
}
devsw->d_flags &= ~D_INIT;
}
static int
prep_cdevsw(struct cdevsw *devsw, int flags)
{
struct cdevsw *dsw2;
mtx_assert(&devmtx, MA_OWNED);
if (devsw->d_flags & D_INIT)
return (0);
if (devsw->d_flags & D_NEEDGIANT) {
dev_unlock();
dsw2 = malloc(sizeof *dsw2, M_DEVT,
(flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK);
dev_lock();
if (dsw2 == NULL && !(devsw->d_flags & D_INIT))
return (ENOMEM);
} else
dsw2 = NULL;
if (devsw->d_flags & D_INIT) {
if (dsw2 != NULL)
cdevsw_free_devlocked(dsw2);
return (0);
}
if (devsw->d_version != D_VERSION_03) {
printf(
"WARNING: Device driver \"%s\" has wrong version %s\n",
devsw->d_name == NULL ? "???" : devsw->d_name,
"and is disabled. Recompile KLD module.");
devsw->d_open = dead_open;
devsw->d_close = dead_close;
devsw->d_read = dead_read;
devsw->d_write = dead_write;
devsw->d_ioctl = dead_ioctl;
devsw->d_poll = dead_poll;
devsw->d_mmap = dead_mmap;
devsw->d_mmap_single = dead_mmap_single;
devsw->d_strategy = dead_strategy;
devsw->d_dump = dead_dump;
devsw->d_kqfilter = dead_kqfilter;
}
if (devsw->d_flags & D_NEEDGIANT) {
if (devsw->d_gianttrick == NULL) {
memcpy(dsw2, devsw, sizeof *dsw2);
devsw->d_gianttrick = dsw2;
dsw2 = NULL;
}
}
#define FIXUP(member, noop, giant) \
do { \
if (devsw->member == NULL) { \
devsw->member = noop; \
} else if (devsw->d_flags & D_NEEDGIANT) \
devsw->member = giant; \
} \
while (0)
FIXUP(d_open, null_open, giant_open);
FIXUP(d_fdopen, NULL, giant_fdopen);
FIXUP(d_close, null_close, giant_close);
FIXUP(d_read, no_read, giant_read);
FIXUP(d_write, no_write, giant_write);
FIXUP(d_ioctl, no_ioctl, giant_ioctl);
FIXUP(d_poll, no_poll, giant_poll);
FIXUP(d_mmap, no_mmap, giant_mmap);
FIXUP(d_strategy, no_strategy, giant_strategy);
FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter);
FIXUP(d_mmap_single, no_mmap_single, giant_mmap_single);
if (devsw->d_dump == NULL) devsw->d_dump = no_dump;
LIST_INIT(&devsw->d_devs);
devsw->d_flags |= D_INIT;
if (dsw2 != NULL)
cdevsw_free_devlocked(dsw2);
return (0);
}
static int
prep_devname(struct cdev *dev, const char *fmt, va_list ap)
{
int len;
char *from, *q, *s, *to;
mtx_assert(&devmtx, MA_OWNED);
len = vsnrprintf(dev->si_name, sizeof(dev->si_name), 32, fmt, ap);
if (len > sizeof(dev->si_name) - 1)
return (ENAMETOOLONG);
/* Strip leading slashes. */
for (from = dev->si_name; *from == '/'; from++)
;
for (to = dev->si_name; *from != '\0'; from++, to++) {
/*
* Spaces and double quotation marks cause
* problems for the devctl(4) protocol.
* Reject names containing those characters.
*/
if (isspace(*from) || *from == '"')
return (EINVAL);
/* Treat multiple sequential slashes as single. */
while (from[0] == '/' && from[1] == '/')
from++;
/* Trailing slash is considered invalid. */
if (from[0] == '/' && from[1] == '\0')
return (EINVAL);
*to = *from;
}
*to = '\0';
if (dev->si_name[0] == '\0')
return (EINVAL);
/* Disallow "." and ".." components. */
for (s = dev->si_name;;) {
for (q = s; *q != '/' && *q != '\0'; q++)
;
if (q - s == 1 && s[0] == '.')
return (EINVAL);
if (q - s == 2 && s[0] == '.' && s[1] == '.')
return (EINVAL);
if (*q != '/')
break;
s = q + 1;
}
if (devfs_dev_exists(dev->si_name) != 0)
return (EEXIST);
return (0);
}
void
make_dev_args_init_impl(struct make_dev_args *args, size_t sz)
{
bzero(args, sz);
args->mda_size = sz;
}
static int
make_dev_sv(struct make_dev_args *args1, struct cdev **dres,
const char *fmt, va_list ap)
{
struct cdev *dev, *dev_new;
struct make_dev_args args;
int res;
bzero(&args, sizeof(args));
if (sizeof(args) < args1->mda_size)
return (EINVAL);
bcopy(args1, &args, args1->mda_size);
KASSERT((args.mda_flags & MAKEDEV_WAITOK) == 0 ||
(args.mda_flags & MAKEDEV_NOWAIT) == 0,
("make_dev_sv: both WAITOK and NOWAIT specified"));
dev_new = devfs_alloc(args.mda_flags);
if (dev_new == NULL)
return (ENOMEM);
dev_lock();
res = prep_cdevsw(args.mda_devsw, args.mda_flags);
if (res != 0) {
dev_unlock();
devfs_free(dev_new);
return (res);
}
dev = newdev(&args, dev_new);
if ((dev->si_flags & SI_NAMED) == 0) {
res = prep_devname(dev, fmt, ap);
if (res != 0) {
if ((args.mda_flags & MAKEDEV_CHECKNAME) == 0) {
panic(
"make_dev_sv: bad si_name (error=%d, si_name=%s)",
res, dev->si_name);
}
if (dev == dev_new) {
LIST_REMOVE(dev, si_list);
dev_unlock();
devfs_free(dev);
} else
dev_unlock();
return (res);
}
}
if ((args.mda_flags & MAKEDEV_REF) != 0)
dev_refl(dev);
if ((args.mda_flags & MAKEDEV_ETERNAL) != 0)
dev->si_flags |= SI_ETERNAL;
if (dev->si_flags & SI_CHEAPCLONE &&
dev->si_flags & SI_NAMED) {
/*
* This is allowed as it removes races and generally
* simplifies cloning devices.
* XXX: still ??
*/
dev_unlock_and_free();
*dres = dev;
return (0);
}
KASSERT(!(dev->si_flags & SI_NAMED),
("make_dev() by driver %s on pre-existing device (min=%x, name=%s)",
args.mda_devsw->d_name, dev2unit(dev), devtoname(dev)));
dev->si_flags |= SI_NAMED;
if (args.mda_cr != NULL)
dev->si_cred = crhold(args.mda_cr);
dev->si_uid = args.mda_uid;
dev->si_gid = args.mda_gid;
dev->si_mode = args.mda_mode;
devfs_create(dev);
clean_unrhdrl(devfs_inos);
dev_unlock_and_free();
notify_create(dev, args.mda_flags);
*dres = dev;
return (0);
}
int
make_dev_s(struct make_dev_args *args, struct cdev **dres,
const char *fmt, ...)
{
va_list ap;
int res;
va_start(ap, fmt);
res = make_dev_sv(args, dres, fmt, ap);
va_end(ap);
return (res);
}
static int
make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, int unit,
struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt,
va_list ap)
{
struct make_dev_args args;
make_dev_args_init(&args);
args.mda_flags = flags;
args.mda_devsw = devsw;
args.mda_cr = cr;
args.mda_uid = uid;
args.mda_gid = gid;
args.mda_mode = mode;
args.mda_unit = unit;
return (make_dev_sv(&args, dres, fmt, ap));
}
struct cdev *
make_dev(struct cdevsw *devsw, int unit, uid_t uid, gid_t gid, int mode,
const char *fmt, ...)
{
struct cdev *dev;
va_list ap;
int res __unused;
va_start(ap, fmt);
res = make_dev_credv(0, &dev, devsw, unit, NULL, uid, gid, mode, fmt,
ap);
va_end(ap);
KASSERT(res == 0 && dev != NULL,
("make_dev: failed make_dev_credv (error=%d)", res));
return (dev);
}
struct cdev *
make_dev_cred(struct cdevsw *devsw, int unit, struct ucred *cr, uid_t uid,
gid_t gid, int mode, const char *fmt, ...)
{
struct cdev *dev;
va_list ap;
int res __unused;
va_start(ap, fmt);
res = make_dev_credv(0, &dev, devsw, unit, cr, uid, gid, mode, fmt, ap);
va_end(ap);
KASSERT(res == 0 && dev != NULL,
("make_dev_cred: failed make_dev_credv (error=%d)", res));
return (dev);
}
struct cdev *
make_dev_credf(int flags, struct cdevsw *devsw, int unit, struct ucred *cr,
uid_t uid, gid_t gid, int mode, const char *fmt, ...)
{
struct cdev *dev;
va_list ap;
int res;
va_start(ap, fmt);
res = make_dev_credv(flags, &dev, devsw, unit, cr, uid, gid, mode,
fmt, ap);
va_end(ap);
KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) ||
((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0,
("make_dev_credf: failed make_dev_credv (error=%d)", res));
return (res == 0 ? dev : NULL);
}
int
make_dev_p(int flags, struct cdev **cdev, struct cdevsw *devsw,
struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, ...)
{
va_list ap;
int res;
va_start(ap, fmt);
res = make_dev_credv(flags, cdev, devsw, 0, cr, uid, gid, mode,
fmt, ap);
va_end(ap);
KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) ||
((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0,
("make_dev_p: failed make_dev_credv (error=%d)", res));
return (res);
}
static void
dev_dependsl(struct cdev *pdev, struct cdev *cdev)
{
cdev->si_parent = pdev;
cdev->si_flags |= SI_CHILD;
LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings);
}
void
dev_depends(struct cdev *pdev, struct cdev *cdev)
{
dev_lock();
dev_dependsl(pdev, cdev);
dev_unlock();
}
static int
make_dev_alias_v(int flags, struct cdev **cdev, struct cdev *pdev,
const char *fmt, va_list ap)
{
struct cdev *dev;
int error;
KASSERT(pdev != NULL, ("make_dev_alias_v: pdev is NULL"));
KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0,
("make_dev_alias_v: both WAITOK and NOWAIT specified"));
KASSERT((flags & ~(MAKEDEV_WAITOK | MAKEDEV_NOWAIT |
MAKEDEV_CHECKNAME)) == 0,
("make_dev_alias_v: invalid flags specified (flags=%02x)", flags));
dev = devfs_alloc(flags);
if (dev == NULL)
return (ENOMEM);
dev_lock();
dev->si_flags |= SI_ALIAS;
error = prep_devname(dev, fmt, ap);
if (error != 0) {
if ((flags & MAKEDEV_CHECKNAME) == 0) {
panic("make_dev_alias_v: bad si_name "
"(error=%d, si_name=%s)", error, dev->si_name);
}
dev_unlock();
devfs_free(dev);
return (error);
}
dev->si_flags |= SI_NAMED;
devfs_create(dev);
dev_dependsl(pdev, dev);
clean_unrhdrl(devfs_inos);
dev_unlock();
notify_create(dev, flags);
*cdev = dev;
return (0);
}
struct cdev *
make_dev_alias(struct cdev *pdev, const char *fmt, ...)
{
struct cdev *dev;
va_list ap;
int res __unused;