Deleted Added
sdiff udiff text old ( 129943 ) new ( 130585 )
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kern_conf.c (129943) kern_conf.c (130585)
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

--- 11 unchanged lines hidden (view full) ---

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>
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

--- 11 unchanged lines hidden (view full) ---

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: head/sys/kern/kern_conf.c 129943 2004-06-01 13:39:02Z phk $");
28__FBSDID("$FreeBSD: head/sys/kern/kern_conf.c 130585 2004-06-16 09:47:26Z phk $");
29
30#include <sys/param.h>
31#include <sys/kernel.h>
32#include <sys/systm.h>
33#include <sys/bio.h>
34#include <sys/lock.h>
35#include <sys/mutex.h>
36#include <sys/sysctl.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/ctype.h>
44#include <sys/tty.h>
45#include <machine/stdarg.h>
46
29
30#include <sys/param.h>
31#include <sys/kernel.h>
32#include <sys/systm.h>
33#include <sys/bio.h>
34#include <sys/lock.h>
35#include <sys/mutex.h>
36#include <sys/sysctl.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/ctype.h>
44#include <sys/tty.h>
45#include <machine/stdarg.h>
46
47static MALLOC_DEFINE(M_DEVT, "dev_t", "dev_t storage");
47static MALLOC_DEFINE(M_DEVT, "struct cdev *", "struct cdev *storage");
48
49/* Built at compile time from sys/conf/majors */
50extern unsigned char reserved_majors[256];
51
52/*
53 * This is the number of hash-buckets. Experiements with 'real-life'
54 * udev_t's show that a prime halfway between two powers of two works
55 * best.
56 */
57#define DEVT_HASH 83
58
48
49/* Built at compile time from sys/conf/majors */
50extern unsigned char reserved_majors[256];
51
52/*
53 * This is the number of hash-buckets. Experiements with 'real-life'
54 * udev_t's show that a prime halfway between two powers of two works
55 * best.
56 */
57#define DEVT_HASH 83
58
59/* The number of dev_t's we can create before malloc(9) kick in. */
59/* The number of struct cdev *'s we can create before malloc(9) kick in. */
60#define DEVT_STASH 50
61
62static struct cdev devt_stash[DEVT_STASH];
63
64static LIST_HEAD(, cdev) dev_hash[DEVT_HASH];
65
66static LIST_HEAD(, cdev) dev_free;
67
68static int free_devt;
69SYSCTL_INT(_debug, OID_AUTO, free_devt, CTLFLAG_RW, &free_devt, 0, "");
70
71static struct mtx devmtx;
60#define DEVT_STASH 50
61
62static struct cdev devt_stash[DEVT_STASH];
63
64static LIST_HEAD(, cdev) dev_hash[DEVT_HASH];
65
66static LIST_HEAD(, cdev) dev_free;
67
68static int free_devt;
69SYSCTL_INT(_debug, OID_AUTO, free_devt, CTLFLAG_RW, &free_devt, 0, "");
70
71static struct mtx devmtx;
72static void freedev(dev_t dev);
72static void freedev(struct cdev *dev);
73
74static void
75devlock(void)
76{
77 if (!mtx_initialized(&devmtx))
73
74static void
75devlock(void)
76{
77 if (!mtx_initialized(&devmtx))
78 mtx_init(&devmtx, "dev_t", NULL, MTX_DEF);
78 mtx_init(&devmtx, "struct cdev *", NULL, MTX_DEF);
79 mtx_lock(&devmtx);
80}
81
82static void
83devunlock(void)
84{
85 mtx_unlock(&devmtx);
86}
87
88void
79 mtx_lock(&devmtx);
80}
81
82static void
83devunlock(void)
84{
85 mtx_unlock(&devmtx);
86}
87
88void
89dev_ref(dev_t dev)
89dev_ref(struct cdev *dev)
90{
91 devlock();
92 dev->si_refcount++;
93 devunlock();
94}
95
96void
90{
91 devlock();
92 dev->si_refcount++;
93 devunlock();
94}
95
96void
97dev_rel(dev_t dev)
97dev_rel(struct cdev *dev)
98{
99 devlock();
100 dev->si_refcount--;
101 KASSERT(dev->si_refcount >= 0,
102 ("dev_rel(%s) gave negative count", devtoname(dev)));
103 if (dev->si_devsw == NULL && dev->si_refcount == 0) {
104 LIST_REMOVE(dev, si_list);
105 freedev(dev);

--- 14 unchanged lines hidden (view full) ---

120{
121 devlock();
122 csw->d_refcount--;
123 KASSERT(csw->d_refcount >= 0,
124 ("cdevsw_vrel(%s) gave negative count", csw->d_name));
125 devunlock();
126}
127
98{
99 devlock();
100 dev->si_refcount--;
101 KASSERT(dev->si_refcount >= 0,
102 ("dev_rel(%s) gave negative count", devtoname(dev)));
103 if (dev->si_devsw == NULL && dev->si_refcount == 0) {
104 LIST_REMOVE(dev, si_list);
105 freedev(dev);

--- 14 unchanged lines hidden (view full) ---

120{
121 devlock();
122 csw->d_refcount--;
123 KASSERT(csw->d_refcount >= 0,
124 ("cdevsw_vrel(%s) gave negative count", csw->d_name));
125 devunlock();
126}
127
128static dev_t makedev(int x, int y);
128static struct cdev *makedev(int x, int y);
129
130int
131nullop(void)
132{
133
134 return (0);
135}
136

--- 58 unchanged lines hidden (view full) ---

195#define null_open (d_open_t *)nullop
196#define null_close (d_close_t *)nullop
197#define no_read (d_read_t *)enodev
198#define no_write (d_write_t *)enodev
199#define no_ioctl (d_ioctl_t *)enodev
200#define no_mmap (d_mmap_t *)enodev
201
202static int
129
130int
131nullop(void)
132{
133
134 return (0);
135}
136

--- 58 unchanged lines hidden (view full) ---

195#define null_open (d_open_t *)nullop
196#define null_close (d_close_t *)nullop
197#define no_read (d_read_t *)enodev
198#define no_write (d_write_t *)enodev
199#define no_ioctl (d_ioctl_t *)enodev
200#define no_mmap (d_mmap_t *)enodev
201
202static int
203no_kqfilter(dev_t dev __unused, struct knote *kn __unused)
203no_kqfilter(struct cdev *dev __unused, struct knote *kn __unused)
204{
205
206 return (1);
207}
208
209static void
210no_strategy(struct bio *bp)
211{
212
213 biofinish(bp, NULL, ENODEV);
214}
215
216static int
204{
205
206 return (1);
207}
208
209static void
210no_strategy(struct bio *bp)
211{
212
213 biofinish(bp, NULL, ENODEV);
214}
215
216static int
217no_poll(dev_t dev __unused, int events, struct thread *td __unused)
217no_poll(struct cdev *dev __unused, int events, struct thread *td __unused)
218{
219 /*
220 * Return true for read/write. If the user asked for something
221 * special, return POLLNVAL, so that clients have a way of
222 * determining reliably whether or not the extended
223 * functionality is present without hard-coding knowledge
224 * of specific filesystem implementations.
225 * Stay in sync with vop_nopoll().
226 */
227 if (events & ~POLLSTANDARD)
228 return (POLLNVAL);
229
230 return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
231}
232
233#define no_dump (dumper_t *)enodev
234
235struct cdevsw *
218{
219 /*
220 * Return true for read/write. If the user asked for something
221 * special, return POLLNVAL, so that clients have a way of
222 * determining reliably whether or not the extended
223 * functionality is present without hard-coding knowledge
224 * of specific filesystem implementations.
225 * Stay in sync with vop_nopoll().
226 */
227 if (events & ~POLLSTANDARD)
228 return (POLLNVAL);
229
230 return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
231}
232
233#define no_dump (dumper_t *)enodev
234
235struct cdevsw *
236devsw(dev_t dev)
236devsw(struct cdev *dev)
237{
238 if (dev->si_devsw != NULL)
239 return (dev->si_devsw);
240 return (&dead_cdevsw);
241}
242
243/*
237{
238 if (dev->si_devsw != NULL)
239 return (dev->si_devsw);
240 return (&dead_cdevsw);
241}
242
243/*
244 * dev_t and u_dev_t primitives
244 * struct cdev *and u_dev_t primitives
245 */
246
247int
245 */
246
247int
248major(dev_t x)
248major(struct cdev *x)
249{
250 if (x == NODEV)
251 return NOUDEV;
252 return((x->si_udev >> 8) & 0xff);
253}
254
255int
249{
250 if (x == NODEV)
251 return NOUDEV;
252 return((x->si_udev >> 8) & 0xff);
253}
254
255int
256minor(dev_t x)
256minor(struct cdev *x)
257{
258 if (x == NODEV)
259 return NOUDEV;
260 return(x->si_udev & 0xffff00ff);
261}
262
263int
257{
258 if (x == NODEV)
259 return NOUDEV;
260 return(x->si_udev & 0xffff00ff);
261}
262
263int
264dev2unit(dev_t x)
264dev2unit(struct cdev *x)
265{
266 int i;
267
268 if (x == NODEV)
269 return NOUDEV;
270 i = minor(x);
271 return ((i & 0xff) | (i >> 8));
272}
273
274int
275unit2minor(int unit)
276{
277
278 KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit));
279 return ((unit & 0xff) | ((unit << 8) & ~0xffff));
280}
281
265{
266 int i;
267
268 if (x == NODEV)
269 return NOUDEV;
270 i = minor(x);
271 return ((i & 0xff) | (i >> 8));
272}
273
274int
275unit2minor(int unit)
276{
277
278 KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit));
279 return ((unit & 0xff) | ((unit << 8) & ~0xffff));
280}
281
282static dev_t
282static struct cdev *
283allocdev(void)
284{
285 static int stashed;
286 struct cdev *si;
287
288 if (LIST_FIRST(&dev_free)) {
289 si = LIST_FIRST(&dev_free);
290 LIST_REMOVE(si, si_hash);

--- 7 unchanged lines hidden (view full) ---

298 }
299 si->__si_namebuf[0] = '\0';
300 si->si_name = si->__si_namebuf;
301 LIST_INIT(&si->si_children);
302 TAILQ_INIT(&si->si_snapshots);
303 return (si);
304}
305
283allocdev(void)
284{
285 static int stashed;
286 struct cdev *si;
287
288 if (LIST_FIRST(&dev_free)) {
289 si = LIST_FIRST(&dev_free);
290 LIST_REMOVE(si, si_hash);

--- 7 unchanged lines hidden (view full) ---

298 }
299 si->__si_namebuf[0] = '\0';
300 si->si_name = si->__si_namebuf;
301 LIST_INIT(&si->si_children);
302 TAILQ_INIT(&si->si_snapshots);
303 return (si);
304}
305
306static dev_t
306static struct cdev *
307makedev(int x, int y)
308{
309 struct cdev *si;
310 udev_t udev;
311 int hash;
312
313 if (x == umajor(NOUDEV) && y == uminor(NOUDEV))
314 panic("makedev of NOUDEV");

--- 5 unchanged lines hidden (view full) ---

320 }
321 si = allocdev();
322 si->si_udev = udev;
323 LIST_INSERT_HEAD(&dev_hash[hash], si, si_hash);
324 return (si);
325}
326
327static void
307makedev(int x, int y)
308{
309 struct cdev *si;
310 udev_t udev;
311 int hash;
312
313 if (x == umajor(NOUDEV) && y == uminor(NOUDEV))
314 panic("makedev of NOUDEV");

--- 5 unchanged lines hidden (view full) ---

320 }
321 si = allocdev();
322 si->si_udev = udev;
323 LIST_INSERT_HEAD(&dev_hash[hash], si, si_hash);
324 return (si);
325}
326
327static void
328freedev(dev_t dev)
328freedev(struct cdev *dev)
329{
330
331 if (dev->si_flags & SI_STASHED) {
332 bzero(dev, sizeof(*dev));
333 dev->si_flags |= SI_STASHED;
334 LIST_INSERT_HEAD(&dev_free, dev, si_hash);
335 } else {
336 FREE(dev, M_DEVT);
337 }
338}
339
340udev_t
329{
330
331 if (dev->si_flags & SI_STASHED) {
332 bzero(dev, sizeof(*dev));
333 dev->si_flags |= SI_STASHED;
334 LIST_INSERT_HEAD(&dev_free, dev, si_hash);
335 } else {
336 FREE(dev, M_DEVT);
337 }
338}
339
340udev_t
341dev2udev(dev_t x)
341dev2udev(struct cdev *x)
342{
343 if (x == NODEV)
344 return (NOUDEV);
345 return (x->si_udev);
346}
347
342{
343 if (x == NODEV)
344 return (NOUDEV);
345 return (x->si_udev);
346}
347
348dev_t
348struct cdev *
349udev2dev(udev_t udev)
350{
351 struct cdev *si;
352 int hash;
353
354 if (udev == NOUDEV)
355 return (NODEV);
356 hash = udev % DEVT_HASH;

--- 105 unchanged lines hidden (view full) ---

462 devsw->d_name, "unreserved major device number",
463 devsw->d_maj);
464 reserved_majors[devsw->d_maj] = devsw->d_maj;
465 }
466 }
467 devunlock();
468}
469
349udev2dev(udev_t udev)
350{
351 struct cdev *si;
352 int hash;
353
354 if (udev == NOUDEV)
355 return (NODEV);
356 hash = udev % DEVT_HASH;

--- 105 unchanged lines hidden (view full) ---

462 devsw->d_name, "unreserved major device number",
463 devsw->d_maj);
464 reserved_majors[devsw->d_maj] = devsw->d_maj;
465 }
466 }
467 devunlock();
468}
469
470dev_t
470struct cdev *
471make_dev(struct cdevsw *devsw, int minornr, uid_t uid, gid_t gid, int perms, const char *fmt, ...)
472{
471make_dev(struct cdevsw *devsw, int minornr, uid_t uid, gid_t gid, int perms, const char *fmt, ...)
472{
473 dev_t dev;
473 struct cdev *dev;
474 va_list ap;
475 int i;
476
477 KASSERT((minornr & ~0xffff00ff) == 0,
478 ("Invalid minor (0x%x) in make_dev", minornr));
479
480 if (!(devsw->d_flags & D_INIT))
481 prep_cdevsw(devsw);

--- 28 unchanged lines hidden (view full) ---

510
511 LIST_INSERT_HEAD(&devsw->d_devs, dev, si_list);
512 devfs_create(dev);
513 devunlock();
514 return (dev);
515}
516
517int
474 va_list ap;
475 int i;
476
477 KASSERT((minornr & ~0xffff00ff) == 0,
478 ("Invalid minor (0x%x) in make_dev", minornr));
479
480 if (!(devsw->d_flags & D_INIT))
481 prep_cdevsw(devsw);

--- 28 unchanged lines hidden (view full) ---

510
511 LIST_INSERT_HEAD(&devsw->d_devs, dev, si_list);
512 devfs_create(dev);
513 devunlock();
514 return (dev);
515}
516
517int
518dev_named(dev_t pdev, const char *name)
518dev_named(struct cdev *pdev, const char *name)
519{
519{
520 dev_t cdev;
520 struct cdev *cdev;
521
522 if (strcmp(devtoname(pdev), name) == 0)
523 return (1);
524 LIST_FOREACH(cdev, &pdev->si_children, si_siblings)
525 if (strcmp(devtoname(cdev), name) == 0)
526 return (1);
527 return (0);
528}
529
530void
521
522 if (strcmp(devtoname(pdev), name) == 0)
523 return (1);
524 LIST_FOREACH(cdev, &pdev->si_children, si_siblings)
525 if (strcmp(devtoname(cdev), name) == 0)
526 return (1);
527 return (0);
528}
529
530void
531dev_depends(dev_t pdev, dev_t cdev)
531dev_depends(struct cdev *pdev, struct cdev *cdev)
532{
533
534 devlock();
535 cdev->si_parent = pdev;
536 cdev->si_flags |= SI_CHILD;
537 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings);
538 devunlock();
539}
540
532{
533
534 devlock();
535 cdev->si_parent = pdev;
536 cdev->si_flags |= SI_CHILD;
537 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings);
538 devunlock();
539}
540
541dev_t
542make_dev_alias(dev_t pdev, const char *fmt, ...)
541struct cdev *
542make_dev_alias(struct cdev *pdev, const char *fmt, ...)
543{
543{
544 dev_t dev;
544 struct cdev *dev;
545 va_list ap;
546 int i;
547
548 dev = allocdev();
549 devlock();
550 dev->si_flags |= SI_ALIAS;
551 dev->si_flags |= SI_NAMED;
552 va_start(ap, fmt);

--- 6 unchanged lines hidden (view full) ---

559
560 devfs_create(dev);
561 devunlock();
562 dev_depends(pdev, dev);
563 return (dev);
564}
565
566static void
545 va_list ap;
546 int i;
547
548 dev = allocdev();
549 devlock();
550 dev->si_flags |= SI_ALIAS;
551 dev->si_flags |= SI_NAMED;
552 va_start(ap, fmt);

--- 6 unchanged lines hidden (view full) ---

559
560 devfs_create(dev);
561 devunlock();
562 dev_depends(pdev, dev);
563 return (dev);
564}
565
566static void
567idestroy_dev(dev_t dev)
567idestroy_dev(struct cdev *dev)
568{
569 if (!(dev->si_flags & SI_NAMED)) {
570 printf( "WARNING: Driver mistake: destroy_dev on %d/%d\n",
571 major(dev), minor(dev));
572 panic("don't do that");
573 }
574
575 devfs_destroy(dev);

--- 16 unchanged lines hidden (view full) ---

592 LIST_REMOVE(dev, si_clone);
593 dev->si_flags &= ~SI_CLONELIST;
594 }
595
596 if (!(dev->si_flags & SI_ALIAS)) {
597 /* Remove from cdevsw list */
598 LIST_REMOVE(dev, si_list);
599
568{
569 if (!(dev->si_flags & SI_NAMED)) {
570 printf( "WARNING: Driver mistake: destroy_dev on %d/%d\n",
571 major(dev), minor(dev));
572 panic("don't do that");
573 }
574
575 devfs_destroy(dev);

--- 16 unchanged lines hidden (view full) ---

592 LIST_REMOVE(dev, si_clone);
593 dev->si_flags &= ~SI_CLONELIST;
594 }
595
596 if (!(dev->si_flags & SI_ALIAS)) {
597 /* Remove from cdevsw list */
598 LIST_REMOVE(dev, si_list);
599
600 /* If cdevsw has no dev_t's, clean it */
600 /* If cdevsw has no struct cdev *'s, clean it */
601 if (LIST_EMPTY(&dev->si_devsw->d_devs))
602 fini_cdevsw(dev->si_devsw);
603
604 LIST_REMOVE(dev, si_hash);
605 }
606 dev->si_drv1 = 0;
607 dev->si_drv2 = 0;
608 dev->si_devsw = NULL;
609 bzero(&dev->__si_u, sizeof(dev->__si_u));
610 dev->si_flags &= ~SI_ALIAS;
611 if (dev->si_refcount > 0) {
612 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list);
613 } else {
614 freedev(dev);
615 }
616}
617
618void
601 if (LIST_EMPTY(&dev->si_devsw->d_devs))
602 fini_cdevsw(dev->si_devsw);
603
604 LIST_REMOVE(dev, si_hash);
605 }
606 dev->si_drv1 = 0;
607 dev->si_drv2 = 0;
608 dev->si_devsw = NULL;
609 bzero(&dev->__si_u, sizeof(dev->__si_u));
610 dev->si_flags &= ~SI_ALIAS;
611 if (dev->si_refcount > 0) {
612 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list);
613 } else {
614 freedev(dev);
615 }
616}
617
618void
619destroy_dev(dev_t dev)
619destroy_dev(struct cdev *dev)
620{
621
622 devlock();
623 idestroy_dev(dev);
624 devunlock();
625}
626
627const char *
620{
621
622 devlock();
623 idestroy_dev(dev);
624 devunlock();
625}
626
627const char *
628devtoname(dev_t dev)
628devtoname(struct cdev *dev)
629{
630 char *p;
631 int mynor;
632
633 if (dev->si_name[0] == '#' || dev->si_name[0] == '\0') {
634 p = dev->si_name;
635 if (devsw(dev))
636 sprintf(p, "#%s/", devsw(dev)->d_name);

--- 39 unchanged lines hidden (view full) ---

676/*
677 * Helper functions for cloning device drivers.
678 *
679 * The objective here is to make it unnecessary for the device drivers to
680 * use rman or similar to manage their unit number space. Due to the way
681 * we do "on-demand" devices, using rman or other "private" methods
682 * will be very tricky to lock down properly once we lock down this file.
683 *
629{
630 char *p;
631 int mynor;
632
633 if (dev->si_name[0] == '#' || dev->si_name[0] == '\0') {
634 p = dev->si_name;
635 if (devsw(dev))
636 sprintf(p, "#%s/", devsw(dev)->d_name);

--- 39 unchanged lines hidden (view full) ---

676/*
677 * Helper functions for cloning device drivers.
678 *
679 * The objective here is to make it unnecessary for the device drivers to
680 * use rman or similar to manage their unit number space. Due to the way
681 * we do "on-demand" devices, using rman or other "private" methods
682 * will be very tricky to lock down properly once we lock down this file.
683 *
684 * Instead we give the drivers these routines which puts the dev_t's that
684 * Instead we give the drivers these routines which puts the struct cdev *'s that
685 * are to be managed on their own list, and gives the driver the ability
686 * to ask for the first free unit number or a given specified unit number.
687 *
688 * In addition these routines support paired devices (pty, nmdm and similar)
689 * by respecting a number of "flag" bits in the minor number.
690 *
691 */
692

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698clone_setup(struct clonedevs **cdp)
699{
700
701 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO);
702 LIST_INIT(&(*cdp)->head);
703}
704
705int
685 * are to be managed on their own list, and gives the driver the ability
686 * to ask for the first free unit number or a given specified unit number.
687 *
688 * In addition these routines support paired devices (pty, nmdm and similar)
689 * by respecting a number of "flag" bits in the minor number.
690 *
691 */
692

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698clone_setup(struct clonedevs **cdp)
699{
700
701 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO);
702 LIST_INIT(&(*cdp)->head);
703}
704
705int
706clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, dev_t *dp, u_int extra)
706clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, struct cdev **dp, u_int extra)
707{
708 struct clonedevs *cd;
707{
708 struct clonedevs *cd;
709 dev_t dev, dl, de;
709 struct cdev *dev, *dl, *de;
710 int unit, low, u;
711
712 KASSERT(*cdp != NULL,
713 ("clone_setup() not called in driver \"%s\"", csw->d_name));
714 KASSERT(!(extra & CLONE_UNITMASK),
715 ("Illegal extra bits (0x%x) in clone_create", extra));
716 KASSERT(*up <= CLONE_UNITMASK,
717 ("Too high unit (0x%x) in clone_create", *up));

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761 LIST_INSERT_HEAD(&cd->head, dev, si_clone);
762 dev->si_flags |= SI_CLONELIST;
763 *up = unit;
764 return (1);
765}
766
767/*
768 * Kill everything still on the list. The driver should already have
710 int unit, low, u;
711
712 KASSERT(*cdp != NULL,
713 ("clone_setup() not called in driver \"%s\"", csw->d_name));
714 KASSERT(!(extra & CLONE_UNITMASK),
715 ("Illegal extra bits (0x%x) in clone_create", extra));
716 KASSERT(*up <= CLONE_UNITMASK,
717 ("Too high unit (0x%x) in clone_create", *up));

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761 LIST_INSERT_HEAD(&cd->head, dev, si_clone);
762 dev->si_flags |= SI_CLONELIST;
763 *up = unit;
764 return (1);
765}
766
767/*
768 * Kill everything still on the list. The driver should already have
769 * disposed of any softc hung of the dev_t's at this time.
769 * disposed of any softc hung of the struct cdev *'s at this time.
770 */
771void
772clone_cleanup(struct clonedevs **cdp)
773{
770 */
771void
772clone_cleanup(struct clonedevs **cdp)
773{
774 dev_t dev, tdev;
774 struct cdev *dev, *tdev;
775 struct clonedevs *cd;
776
777 cd = *cdp;
778 if (cd == NULL)
779 return;
780 LIST_FOREACH_SAFE(dev, &cd->head, si_clone, tdev) {
781 KASSERT(dev->si_flags & SI_NAMED,
782 ("Driver has goofed in cloning underways udev %x", dev->si_udev));
783 destroy_dev(dev);
784 }
785 free(cd, M_DEVBUF);
786 *cdp = NULL;
787}
788
789/*
775 struct clonedevs *cd;
776
777 cd = *cdp;
778 if (cd == NULL)
779 return;
780 LIST_FOREACH_SAFE(dev, &cd->head, si_clone, tdev) {
781 KASSERT(dev->si_flags & SI_NAMED,
782 ("Driver has goofed in cloning underways udev %x", dev->si_udev));
783 destroy_dev(dev);
784 }
785 free(cd, M_DEVBUF);
786 *cdp = NULL;
787}
788
789/*
790 * Helper sysctl for devname(3). We're given a {u}dev_t and return
790 * Helper sysctl for devname(3). We're given a {u}struct cdev *and return
791 * the name, if any, registered by the device driver.
792 */
793static int
794sysctl_devname(SYSCTL_HANDLER_ARGS)
795{
796 int error;
797 udev_t ud;
791 * the name, if any, registered by the device driver.
792 */
793static int
794sysctl_devname(SYSCTL_HANDLER_ARGS)
795{
796 int error;
797 udev_t ud;
798 dev_t dev;
798 struct cdev *dev;
799
800 error = SYSCTL_IN(req, &ud, sizeof (ud));
801 if (error)
802 return (error);
803 if (ud == NOUDEV)
804 return(EINVAL);
805 dev = udev2dev(ud);
806 if (dev == NODEV)
807 error = ENOENT;
808 else
809 error = SYSCTL_OUT(req, dev->si_name, strlen(dev->si_name) + 1);
810 return (error);
811}
812
813SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY,
814 NULL, 0, sysctl_devname, "", "devname(3) handler");
799
800 error = SYSCTL_IN(req, &ud, sizeof (ud));
801 if (error)
802 return (error);
803 if (ud == NOUDEV)
804 return(EINVAL);
805 dev = udev2dev(ud);
806 if (dev == NODEV)
807 error = ENOENT;
808 else
809 error = SYSCTL_OUT(req, dev->si_name, strlen(dev->si_name) + 1);
810 return (error);
811}
812
813SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY,
814 NULL, 0, sysctl_devname, "", "devname(3) handler");