1/*-
2 * Copyright (c) 2000-2004
3 * Poul-Henning Kamp. All rights reserved.
4 * Copyright (c) 1989, 1992-1993, 1995
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software donated to Berkeley by
8 * Jan-Simon Pendry.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)kernfs_vnops.c 8.15 (Berkeley) 5/21/95
32 * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vnops.c 1.43
33 *
| 1/*-
2 * Copyright (c) 2000-2004
3 * Poul-Henning Kamp. All rights reserved.
4 * Copyright (c) 1989, 1992-1993, 1995
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software donated to Berkeley by
8 * Jan-Simon Pendry.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)kernfs_vnops.c 8.15 (Berkeley) 5/21/95
32 * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vnops.c 1.43
33 *
|
34 * $FreeBSD: stable/10/sys/fs/devfs/devfs_vnops.c 279685 2015-03-06 09:22:05Z kib $
| 34 * $FreeBSD: stable/10/sys/fs/devfs/devfs_vnops.c 281255 2015-04-08 02:15:13Z kib $
|
35 */
36
37/*
38 * TODO:
39 * mkdir: want it ?
40 */
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/conf.h>
45#include <sys/dirent.h>
46#include <sys/fcntl.h>
47#include <sys/file.h>
48#include <sys/filedesc.h>
49#include <sys/filio.h>
50#include <sys/jail.h>
51#include <sys/kernel.h>
52#include <sys/lock.h>
53#include <sys/malloc.h>
54#include <sys/mount.h>
55#include <sys/namei.h>
56#include <sys/priv.h>
57#include <sys/proc.h>
58#include <sys/stat.h>
59#include <sys/sx.h>
| 35 */
36
37/*
38 * TODO:
39 * mkdir: want it ?
40 */
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/conf.h>
45#include <sys/dirent.h>
46#include <sys/fcntl.h>
47#include <sys/file.h>
48#include <sys/filedesc.h>
49#include <sys/filio.h>
50#include <sys/jail.h>
51#include <sys/kernel.h>
52#include <sys/lock.h>
53#include <sys/malloc.h>
54#include <sys/mount.h>
55#include <sys/namei.h>
56#include <sys/priv.h>
57#include <sys/proc.h>
58#include <sys/stat.h>
59#include <sys/sx.h>
|
| 60#include <sys/sysctl.h>
|
60#include <sys/time.h>
61#include <sys/ttycom.h>
62#include <sys/unistd.h>
63#include <sys/vnode.h>
64
65static struct vop_vector devfs_vnodeops;
66static struct fileops devfs_ops_f;
67
68#include <fs/devfs/devfs.h>
69#include <fs/devfs/devfs_int.h>
70
71#include <security/mac/mac_framework.h>
72
73static MALLOC_DEFINE(M_CDEVPDATA, "DEVFSP", "Metainfo for cdev-fp data");
74
75struct mtx devfs_de_interlock;
76MTX_SYSINIT(devfs_de_interlock, &devfs_de_interlock, "devfs interlock", MTX_DEF);
77struct sx clone_drain_lock;
78SX_SYSINIT(clone_drain_lock, &clone_drain_lock, "clone events drain lock");
79struct mtx cdevpriv_mtx;
80MTX_SYSINIT(cdevpriv_mtx, &cdevpriv_mtx, "cdevpriv lock", MTX_DEF);
81
| 61#include <sys/time.h>
62#include <sys/ttycom.h>
63#include <sys/unistd.h>
64#include <sys/vnode.h>
65
66static struct vop_vector devfs_vnodeops;
67static struct fileops devfs_ops_f;
68
69#include <fs/devfs/devfs.h>
70#include <fs/devfs/devfs_int.h>
71
72#include <security/mac/mac_framework.h>
73
74static MALLOC_DEFINE(M_CDEVPDATA, "DEVFSP", "Metainfo for cdev-fp data");
75
76struct mtx devfs_de_interlock;
77MTX_SYSINIT(devfs_de_interlock, &devfs_de_interlock, "devfs interlock", MTX_DEF);
78struct sx clone_drain_lock;
79SX_SYSINIT(clone_drain_lock, &clone_drain_lock, "clone events drain lock");
80struct mtx cdevpriv_mtx;
81MTX_SYSINIT(cdevpriv_mtx, &cdevpriv_mtx, "cdevpriv lock", MTX_DEF);
82
|
| 83SYSCTL_DECL(_vfs_devfs);
84
85static int devfs_dotimes;
86SYSCTL_INT(_vfs_devfs, OID_AUTO, dotimes, CTLFLAG_RW,
87 &devfs_dotimes, 0, "Update timestamps on DEVFS with default precision");
88
89/*
90 * Update devfs node timestamp. Note that updates are unlocked and
91 * stat(2) could see partially updated times.
92 */
93static void
94devfs_timestamp(struct timespec *tsp)
95{
96 time_t ts;
97
98 if (devfs_dotimes) {
99 vfs_timestamp(tsp);
100 } else {
101 ts = time_second;
102 if (tsp->tv_sec != ts) {
103 tsp->tv_sec = ts;
104 tsp->tv_nsec = 0;
105 }
106 }
107}
108
|
82static int
83devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp,
84 int *ref)
85{
86
87 *dswp = devvn_refthread(fp->f_vnode, devp, ref);
88 if (*devp != fp->f_data) {
89 if (*dswp != NULL)
90 dev_relthread(*devp, *ref);
91 return (ENXIO);
92 }
93 KASSERT((*devp)->si_refcount > 0,
94 ("devfs: un-referenced struct cdev *(%s)", devtoname(*devp)));
95 if (*dswp == NULL)
96 return (ENXIO);
97 curthread->td_fpop = fp;
98 return (0);
99}
100
101int
102devfs_get_cdevpriv(void **datap)
103{
104 struct file *fp;
105 struct cdev_privdata *p;
106 int error;
107
108 fp = curthread->td_fpop;
109 if (fp == NULL)
110 return (EBADF);
111 p = fp->f_cdevpriv;
112 if (p != NULL) {
113 error = 0;
114 *datap = p->cdpd_data;
115 } else
116 error = ENOENT;
117 return (error);
118}
119
120int
121devfs_set_cdevpriv(void *priv, cdevpriv_dtr_t priv_dtr)
122{
123 struct file *fp;
124 struct cdev_priv *cdp;
125 struct cdev_privdata *p;
126 int error;
127
128 fp = curthread->td_fpop;
129 if (fp == NULL)
130 return (ENOENT);
131 cdp = cdev2priv((struct cdev *)fp->f_data);
132 p = malloc(sizeof(struct cdev_privdata), M_CDEVPDATA, M_WAITOK);
133 p->cdpd_data = priv;
134 p->cdpd_dtr = priv_dtr;
135 p->cdpd_fp = fp;
136 mtx_lock(&cdevpriv_mtx);
137 if (fp->f_cdevpriv == NULL) {
138 LIST_INSERT_HEAD(&cdp->cdp_fdpriv, p, cdpd_list);
139 fp->f_cdevpriv = p;
140 mtx_unlock(&cdevpriv_mtx);
141 error = 0;
142 } else {
143 mtx_unlock(&cdevpriv_mtx);
144 free(p, M_CDEVPDATA);
145 error = EBUSY;
146 }
147 return (error);
148}
149
150void
151devfs_destroy_cdevpriv(struct cdev_privdata *p)
152{
153
154 mtx_assert(&cdevpriv_mtx, MA_OWNED);
155 p->cdpd_fp->f_cdevpriv = NULL;
156 LIST_REMOVE(p, cdpd_list);
157 mtx_unlock(&cdevpriv_mtx);
158 (p->cdpd_dtr)(p->cdpd_data);
159 free(p, M_CDEVPDATA);
160}
161
162void
163devfs_fpdrop(struct file *fp)
164{
165 struct cdev_privdata *p;
166
167 mtx_lock(&cdevpriv_mtx);
168 if ((p = fp->f_cdevpriv) == NULL) {
169 mtx_unlock(&cdevpriv_mtx);
170 return;
171 }
172 devfs_destroy_cdevpriv(p);
173}
174
175void
176devfs_clear_cdevpriv(void)
177{
178 struct file *fp;
179
180 fp = curthread->td_fpop;
181 if (fp == NULL)
182 return;
183 devfs_fpdrop(fp);
184}
185
186/*
187 * On success devfs_populate_vp() returns with dmp->dm_lock held.
188 */
189static int
190devfs_populate_vp(struct vnode *vp)
191{
192 struct devfs_dirent *de;
193 struct devfs_mount *dmp;
194 int locked;
195
196 ASSERT_VOP_LOCKED(vp, "devfs_populate_vp");
197
198 dmp = VFSTODEVFS(vp->v_mount);
199 locked = VOP_ISLOCKED(vp);
200
201 sx_xlock(&dmp->dm_lock);
202 DEVFS_DMP_HOLD(dmp);
203
204 /* Can't call devfs_populate() with the vnode lock held. */
205 VOP_UNLOCK(vp, 0);
206 devfs_populate(dmp);
207
208 sx_xunlock(&dmp->dm_lock);
209 vn_lock(vp, locked | LK_RETRY);
210 sx_xlock(&dmp->dm_lock);
211 if (DEVFS_DMP_DROP(dmp)) {
212 sx_xunlock(&dmp->dm_lock);
213 devfs_unmount_final(dmp);
214 return (EBADF);
215 }
216 if ((vp->v_iflag & VI_DOOMED) != 0) {
217 sx_xunlock(&dmp->dm_lock);
218 return (EBADF);
219 }
220 de = vp->v_data;
221 KASSERT(de != NULL,
222 ("devfs_populate_vp: vp->v_data == NULL but vnode not doomed"));
223 if ((de->de_flags & DE_DOOMED) != 0) {
224 sx_xunlock(&dmp->dm_lock);
225 return (EBADF);
226 }
227
228 return (0);
229}
230
231static int
232devfs_vptocnp(struct vop_vptocnp_args *ap)
233{
234 struct vnode *vp = ap->a_vp;
235 struct vnode **dvp = ap->a_vpp;
236 struct devfs_mount *dmp;
237 char *buf = ap->a_buf;
238 int *buflen = ap->a_buflen;
239 struct devfs_dirent *dd, *de;
240 int i, error;
241
242 dmp = VFSTODEVFS(vp->v_mount);
243
244 error = devfs_populate_vp(vp);
245 if (error != 0)
246 return (error);
247
248 i = *buflen;
249 dd = vp->v_data;
250
251 if (vp->v_type == VCHR) {
252 i -= strlen(dd->de_cdp->cdp_c.si_name);
253 if (i < 0) {
254 error = ENOMEM;
255 goto finished;
256 }
257 bcopy(dd->de_cdp->cdp_c.si_name, buf + i,
258 strlen(dd->de_cdp->cdp_c.si_name));
259 de = dd->de_dir;
260 } else if (vp->v_type == VDIR) {
261 if (dd == dmp->dm_rootdir) {
262 *dvp = vp;
263 vref(*dvp);
264 goto finished;
265 }
266 i -= dd->de_dirent->d_namlen;
267 if (i < 0) {
268 error = ENOMEM;
269 goto finished;
270 }
271 bcopy(dd->de_dirent->d_name, buf + i,
272 dd->de_dirent->d_namlen);
273 de = dd;
274 } else {
275 error = ENOENT;
276 goto finished;
277 }
278 *buflen = i;
279 de = devfs_parent_dirent(de);
280 if (de == NULL) {
281 error = ENOENT;
282 goto finished;
283 }
284 mtx_lock(&devfs_de_interlock);
285 *dvp = de->de_vnode;
286 if (*dvp != NULL) {
287 VI_LOCK(*dvp);
288 mtx_unlock(&devfs_de_interlock);
289 vholdl(*dvp);
290 VI_UNLOCK(*dvp);
291 vref(*dvp);
292 vdrop(*dvp);
293 } else {
294 mtx_unlock(&devfs_de_interlock);
295 error = ENOENT;
296 }
297finished:
298 sx_xunlock(&dmp->dm_lock);
299 return (error);
300}
301
302/*
303 * Construct the fully qualified path name relative to the mountpoint.
304 * If a NULL cnp is provided, no '/' is appended to the resulting path.
305 */
306char *
307devfs_fqpn(char *buf, struct devfs_mount *dmp, struct devfs_dirent *dd,
308 struct componentname *cnp)
309{
310 int i;
311 struct devfs_dirent *de;
312
313 sx_assert(&dmp->dm_lock, SA_LOCKED);
314
315 i = SPECNAMELEN;
316 buf[i] = '\0';
317 if (cnp != NULL)
318 i -= cnp->cn_namelen;
319 if (i < 0)
320 return (NULL);
321 if (cnp != NULL)
322 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen);
323 de = dd;
324 while (de != dmp->dm_rootdir) {
325 if (cnp != NULL || i < SPECNAMELEN) {
326 i--;
327 if (i < 0)
328 return (NULL);
329 buf[i] = '/';
330 }
331 i -= de->de_dirent->d_namlen;
332 if (i < 0)
333 return (NULL);
334 bcopy(de->de_dirent->d_name, buf + i,
335 de->de_dirent->d_namlen);
336 de = devfs_parent_dirent(de);
337 if (de == NULL)
338 return (NULL);
339 }
340 return (buf + i);
341}
342
343static int
344devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp,
345 struct devfs_dirent *de)
346{
347 int not_found;
348
349 not_found = 0;
350 if (de->de_flags & DE_DOOMED)
351 not_found = 1;
352 if (DEVFS_DE_DROP(de)) {
353 KASSERT(not_found == 1, ("DEVFS de dropped but not doomed"));
354 devfs_dirent_free(de);
355 }
356 if (DEVFS_DMP_DROP(dmp)) {
357 KASSERT(not_found == 1,
358 ("DEVFS mount struct freed before dirent"));
359 not_found = 2;
360 sx_xunlock(&dmp->dm_lock);
361 devfs_unmount_final(dmp);
362 }
363 if (not_found == 1 || (drop_dm_lock && not_found != 2))
364 sx_unlock(&dmp->dm_lock);
365 return (not_found);
366}
367
368static void
369devfs_insmntque_dtr(struct vnode *vp, void *arg)
370{
371 struct devfs_dirent *de;
372
373 de = (struct devfs_dirent *)arg;
374 mtx_lock(&devfs_de_interlock);
375 vp->v_data = NULL;
376 de->de_vnode = NULL;
377 mtx_unlock(&devfs_de_interlock);
378 vgone(vp);
379 vput(vp);
380}
381
382/*
383 * devfs_allocv shall be entered with dmp->dm_lock held, and it drops
384 * it on return.
385 */
386int
387devfs_allocv(struct devfs_dirent *de, struct mount *mp, int lockmode,
388 struct vnode **vpp)
389{
390 int error;
391 struct vnode *vp;
392 struct cdev *dev;
393 struct devfs_mount *dmp;
394 struct cdevsw *dsw;
395
396 dmp = VFSTODEVFS(mp);
397 if (de->de_flags & DE_DOOMED) {
398 sx_xunlock(&dmp->dm_lock);
399 return (ENOENT);
400 }
401loop:
402 DEVFS_DE_HOLD(de);
403 DEVFS_DMP_HOLD(dmp);
404 mtx_lock(&devfs_de_interlock);
405 vp = de->de_vnode;
406 if (vp != NULL) {
407 VI_LOCK(vp);
408 mtx_unlock(&devfs_de_interlock);
409 sx_xunlock(&dmp->dm_lock);
410 vget(vp, lockmode | LK_INTERLOCK | LK_RETRY, curthread);
411 sx_xlock(&dmp->dm_lock);
412 if (devfs_allocv_drop_refs(0, dmp, de)) {
413 vput(vp);
414 return (ENOENT);
415 }
416 else if ((vp->v_iflag & VI_DOOMED) != 0) {
417 mtx_lock(&devfs_de_interlock);
418 if (de->de_vnode == vp) {
419 de->de_vnode = NULL;
420 vp->v_data = NULL;
421 }
422 mtx_unlock(&devfs_de_interlock);
423 vput(vp);
424 goto loop;
425 }
426 sx_xunlock(&dmp->dm_lock);
427 *vpp = vp;
428 return (0);
429 }
430 mtx_unlock(&devfs_de_interlock);
431 if (de->de_dirent->d_type == DT_CHR) {
432 if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) {
433 devfs_allocv_drop_refs(1, dmp, de);
434 return (ENOENT);
435 }
436 dev = &de->de_cdp->cdp_c;
437 } else {
438 dev = NULL;
439 }
440 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp);
441 if (error != 0) {
442 devfs_allocv_drop_refs(1, dmp, de);
443 printf("devfs_allocv: failed to allocate new vnode\n");
444 return (error);
445 }
446
447 if (de->de_dirent->d_type == DT_CHR) {
448 vp->v_type = VCHR;
449 VI_LOCK(vp);
450 dev_lock();
451 dev_refl(dev);
452 /* XXX: v_rdev should be protect by vnode lock */
453 vp->v_rdev = dev;
454 KASSERT(vp->v_usecount == 1,
455 ("%s %d (%d)\n", __func__, __LINE__, vp->v_usecount));
456 dev->si_usecount += vp->v_usecount;
457 /* Special casing of ttys for deadfs. Probably redundant. */
458 dsw = dev->si_devsw;
459 if (dsw != NULL && (dsw->d_flags & D_TTY) != 0)
460 vp->v_vflag |= VV_ISTTY;
461 dev_unlock();
462 VI_UNLOCK(vp);
463 if ((dev->si_flags & SI_ETERNAL) != 0)
464 vp->v_vflag |= VV_ETERNALDEV;
465 vp->v_op = &devfs_specops;
466 } else if (de->de_dirent->d_type == DT_DIR) {
467 vp->v_type = VDIR;
468 } else if (de->de_dirent->d_type == DT_LNK) {
469 vp->v_type = VLNK;
470 } else {
471 vp->v_type = VBAD;
472 }
473 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS);
474 VN_LOCK_ASHARE(vp);
475 mtx_lock(&devfs_de_interlock);
476 vp->v_data = de;
477 de->de_vnode = vp;
478 mtx_unlock(&devfs_de_interlock);
479 error = insmntque1(vp, mp, devfs_insmntque_dtr, de);
480 if (error != 0) {
481 (void) devfs_allocv_drop_refs(1, dmp, de);
482 return (error);
483 }
484 if (devfs_allocv_drop_refs(0, dmp, de)) {
485 vput(vp);
486 return (ENOENT);
487 }
488#ifdef MAC
489 mac_devfs_vnode_associate(mp, de, vp);
490#endif
491 sx_xunlock(&dmp->dm_lock);
492 *vpp = vp;
493 return (0);
494}
495
496static int
497devfs_access(struct vop_access_args *ap)
498{
499 struct vnode *vp = ap->a_vp;
500 struct devfs_dirent *de;
501 int error;
502
503 de = vp->v_data;
504 if (vp->v_type == VDIR)
505 de = de->de_dir;
506
507 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid,
508 ap->a_accmode, ap->a_cred, NULL);
509 if (error == 0)
510 return (0);
511 if (error != EACCES)
512 return (error);
513 /* We do, however, allow access to the controlling terminal */
514 if (!(ap->a_td->td_proc->p_flag & P_CONTROLT))
515 return (error);
516 if (ap->a_td->td_proc->p_session->s_ttydp == de->de_cdp)
517 return (0);
518 return (error);
519}
520
521/* ARGSUSED */
522static int
523devfs_close(struct vop_close_args *ap)
524{
525 struct vnode *vp = ap->a_vp, *oldvp;
526 struct thread *td = ap->a_td;
527 struct cdev *dev = vp->v_rdev;
528 struct cdevsw *dsw;
529 int vp_locked, error, ref;
530
531 /*
532 * XXX: Don't call d_close() if we were called because of
533 * XXX: insmntque1() failure.
534 */
535 if (vp->v_data == NULL)
536 return (0);
537
538 /*
539 * Hack: a tty device that is a controlling terminal
540 * has a reference from the session structure.
541 * We cannot easily tell that a character device is
542 * a controlling terminal, unless it is the closing
543 * process' controlling terminal. In that case,
544 * if the reference count is 2 (this last descriptor
545 * plus the session), release the reference from the session.
546 */
547 oldvp = NULL;
548 sx_xlock(&proctree_lock);
549 if (td && vp == td->td_proc->p_session->s_ttyvp) {
550 SESS_LOCK(td->td_proc->p_session);
551 VI_LOCK(vp);
552 if (count_dev(dev) == 2 && (vp->v_iflag & VI_DOOMED) == 0) {
553 td->td_proc->p_session->s_ttyvp = NULL;
554 td->td_proc->p_session->s_ttydp = NULL;
555 oldvp = vp;
556 }
557 VI_UNLOCK(vp);
558 SESS_UNLOCK(td->td_proc->p_session);
559 }
560 sx_xunlock(&proctree_lock);
561 if (oldvp != NULL)
562 vrele(oldvp);
563 /*
564 * We do not want to really close the device if it
565 * is still in use unless we are trying to close it
566 * forcibly. Since every use (buffer, vnode, swap, cmap)
567 * holds a reference to the vnode, and because we mark
568 * any other vnodes that alias this device, when the
569 * sum of the reference counts on all the aliased
570 * vnodes descends to one, we are on last close.
571 */
572 dsw = dev_refthread(dev, &ref);
573 if (dsw == NULL)
574 return (ENXIO);
575 VI_LOCK(vp);
576 if (vp->v_iflag & VI_DOOMED) {
577 /* Forced close. */
578 } else if (dsw->d_flags & D_TRACKCLOSE) {
579 /* Keep device updated on status. */
580 } else if (count_dev(dev) > 1) {
581 VI_UNLOCK(vp);
582 dev_relthread(dev, ref);
583 return (0);
584 }
585 vholdl(vp);
586 VI_UNLOCK(vp);
587 vp_locked = VOP_ISLOCKED(vp);
588 VOP_UNLOCK(vp, 0);
589 KASSERT(dev->si_refcount > 0,
590 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev)));
591 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td);
592 dev_relthread(dev, ref);
593 vn_lock(vp, vp_locked | LK_RETRY);
594 vdrop(vp);
595 return (error);
596}
597
598static int
599devfs_close_f(struct file *fp, struct thread *td)
600{
601 int error;
602 struct file *fpop;
603
604 /*
605 * NB: td may be NULL if this descriptor is closed due to
606 * garbage collection from a closed UNIX domain socket.
607 */
608 fpop = curthread->td_fpop;
609 curthread->td_fpop = fp;
610 error = vnops.fo_close(fp, td);
611 curthread->td_fpop = fpop;
612
613 /*
614 * The f_cdevpriv cannot be assigned non-NULL value while we
615 * are destroying the file.
616 */
617 if (fp->f_cdevpriv != NULL)
618 devfs_fpdrop(fp);
619 return (error);
620}
621
622static int
623devfs_fsync(struct vop_fsync_args *ap)
624{
625 int error;
626 struct bufobj *bo;
627 struct devfs_dirent *de;
628
629 if (!vn_isdisk(ap->a_vp, &error)) {
630 bo = &ap->a_vp->v_bufobj;
631 de = ap->a_vp->v_data;
632 if (error == ENXIO && bo->bo_dirty.bv_cnt > 0) {
633 printf("Device %s went missing before all of the data "
634 "could be written to it; expect data loss.\n",
635 de->de_dirent->d_name);
636
637 error = vop_stdfsync(ap);
638 if (bo->bo_dirty.bv_cnt != 0 || error != 0)
639 panic("devfs_fsync: vop_stdfsync failed.");
640 }
641
642 return (0);
643 }
644
645 return (vop_stdfsync(ap));
646}
647
648static int
649devfs_getattr(struct vop_getattr_args *ap)
650{
651 struct vnode *vp = ap->a_vp;
652 struct vattr *vap = ap->a_vap;
653 int error;
654 struct devfs_dirent *de;
655 struct devfs_mount *dmp;
656 struct cdev *dev;
657
658 error = devfs_populate_vp(vp);
659 if (error != 0)
660 return (error);
661
662 dmp = VFSTODEVFS(vp->v_mount);
663 sx_xunlock(&dmp->dm_lock);
664
665 de = vp->v_data;
666 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp));
667 if (vp->v_type == VDIR) {
668 de = de->de_dir;
669 KASSERT(de != NULL,
670 ("Null dir dirent in devfs_getattr vp=%p", vp));
671 }
672 vap->va_uid = de->de_uid;
673 vap->va_gid = de->de_gid;
674 vap->va_mode = de->de_mode;
675 if (vp->v_type == VLNK)
676 vap->va_size = strlen(de->de_symlink);
677 else if (vp->v_type == VDIR)
678 vap->va_size = vap->va_bytes = DEV_BSIZE;
679 else
680 vap->va_size = 0;
681 if (vp->v_type != VDIR)
682 vap->va_bytes = 0;
683 vap->va_blocksize = DEV_BSIZE;
684 vap->va_type = vp->v_type;
685
686#define fix(aa) \
687 do { \
688 if ((aa).tv_sec <= 3600) { \
689 (aa).tv_sec = boottime.tv_sec; \
690 (aa).tv_nsec = boottime.tv_usec * 1000; \
691 } \
692 } while (0)
693
694 if (vp->v_type != VCHR) {
695 fix(de->de_atime);
696 vap->va_atime = de->de_atime;
697 fix(de->de_mtime);
698 vap->va_mtime = de->de_mtime;
699 fix(de->de_ctime);
700 vap->va_ctime = de->de_ctime;
701 } else {
702 dev = vp->v_rdev;
703 fix(dev->si_atime);
704 vap->va_atime = dev->si_atime;
705 fix(dev->si_mtime);
706 vap->va_mtime = dev->si_mtime;
707 fix(dev->si_ctime);
708 vap->va_ctime = dev->si_ctime;
709
710 vap->va_rdev = cdev2priv(dev)->cdp_inode;
711 }
712 vap->va_gen = 0;
713 vap->va_flags = 0;
714 vap->va_filerev = 0;
715 vap->va_nlink = de->de_links;
716 vap->va_fileid = de->de_inode;
717
718 return (error);
719}
720
721/* ARGSUSED */
722static int
723devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td)
724{
725 struct cdev *dev;
726 struct cdevsw *dsw;
727 struct vnode *vp;
728 struct vnode *vpold;
729 int error, i, ref;
730 const char *p;
731 struct fiodgname_arg *fgn;
732 struct file *fpop;
733
734 fpop = td->td_fpop;
735 error = devfs_fp_check(fp, &dev, &dsw, &ref);
736 if (error != 0) {
737 error = vnops.fo_ioctl(fp, com, data, cred, td);
738 return (error);
739 }
740
741 if (com == FIODTYPE) {
742 *(int *)data = dsw->d_flags & D_TYPEMASK;
743 td->td_fpop = fpop;
744 dev_relthread(dev, ref);
745 return (0);
746 } else if (com == FIODGNAME) {
747 fgn = data;
748 p = devtoname(dev);
749 i = strlen(p) + 1;
750 if (i > fgn->len)
751 error = EINVAL;
752 else
753 error = copyout(p, fgn->buf, i);
754 td->td_fpop = fpop;
755 dev_relthread(dev, ref);
756 return (error);
757 }
758 error = dsw->d_ioctl(dev, com, data, fp->f_flag, td);
759 td->td_fpop = NULL;
760 dev_relthread(dev, ref);
761 if (error == ENOIOCTL)
762 error = ENOTTY;
763 if (error == 0 && com == TIOCSCTTY) {
764 vp = fp->f_vnode;
765
766 /* Do nothing if reassigning same control tty */
767 sx_slock(&proctree_lock);
768 if (td->td_proc->p_session->s_ttyvp == vp) {
769 sx_sunlock(&proctree_lock);
770 return (0);
771 }
772
773 vpold = td->td_proc->p_session->s_ttyvp;
774 VREF(vp);
775 SESS_LOCK(td->td_proc->p_session);
776 td->td_proc->p_session->s_ttyvp = vp;
777 td->td_proc->p_session->s_ttydp = cdev2priv(dev);
778 SESS_UNLOCK(td->td_proc->p_session);
779
780 sx_sunlock(&proctree_lock);
781
782 /* Get rid of reference to old control tty */
783 if (vpold)
784 vrele(vpold);
785 }
786 return (error);
787}
788
789/* ARGSUSED */
790static int
791devfs_kqfilter_f(struct file *fp, struct knote *kn)
792{
793 struct cdev *dev;
794 struct cdevsw *dsw;
795 int error, ref;
796 struct file *fpop;
797 struct thread *td;
798
799 td = curthread;
800 fpop = td->td_fpop;
801 error = devfs_fp_check(fp, &dev, &dsw, &ref);
802 if (error)
803 return (error);
804 error = dsw->d_kqfilter(dev, kn);
805 td->td_fpop = fpop;
806 dev_relthread(dev, ref);
807 return (error);
808}
809
810static inline int
811devfs_prison_check(struct devfs_dirent *de, struct thread *td)
812{
813 struct cdev_priv *cdp;
814 struct ucred *dcr;
815 int error;
816
817 cdp = de->de_cdp;
818 if (cdp == NULL)
819 return (0);
820 dcr = cdp->cdp_c.si_cred;
821 if (dcr == NULL)
822 return (0);
823
824 error = prison_check(td->td_ucred, dcr);
825 if (error == 0)
826 return (0);
827 /* We do, however, allow access to the controlling terminal */
828 if (!(td->td_proc->p_flag & P_CONTROLT))
829 return (error);
830 if (td->td_proc->p_session->s_ttydp == cdp)
831 return (0);
832 return (error);
833}
834
835static int
836devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock)
837{
838 struct componentname *cnp;
839 struct vnode *dvp, **vpp;
840 struct thread *td;
841 struct devfs_dirent *de, *dd;
842 struct devfs_dirent **dde;
843 struct devfs_mount *dmp;
844 struct cdev *cdev;
845 int error, flags, nameiop, dvplocked;
846 char specname[SPECNAMELEN + 1], *pname;
847
848 cnp = ap->a_cnp;
849 vpp = ap->a_vpp;
850 dvp = ap->a_dvp;
851 pname = cnp->cn_nameptr;
852 td = cnp->cn_thread;
853 flags = cnp->cn_flags;
854 nameiop = cnp->cn_nameiop;
855 dmp = VFSTODEVFS(dvp->v_mount);
856 dd = dvp->v_data;
857 *vpp = NULLVP;
858
859 if ((flags & ISLASTCN) && nameiop == RENAME)
860 return (EOPNOTSUPP);
861
862 if (dvp->v_type != VDIR)
863 return (ENOTDIR);
864
865 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT))
866 return (EIO);
867
868 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td);
869 if (error)
870 return (error);
871
872 if (cnp->cn_namelen == 1 && *pname == '.') {
873 if ((flags & ISLASTCN) && nameiop != LOOKUP)
874 return (EINVAL);
875 *vpp = dvp;
876 VREF(dvp);
877 return (0);
878 }
879
880 if (flags & ISDOTDOT) {
881 if ((flags & ISLASTCN) && nameiop != LOOKUP)
882 return (EINVAL);
883 de = devfs_parent_dirent(dd);
884 if (de == NULL)
885 return (ENOENT);
886 dvplocked = VOP_ISLOCKED(dvp);
887 VOP_UNLOCK(dvp, 0);
888 error = devfs_allocv(de, dvp->v_mount,
889 cnp->cn_lkflags & LK_TYPE_MASK, vpp);
890 *dm_unlock = 0;
891 vn_lock(dvp, dvplocked | LK_RETRY);
892 return (error);
893 }
894
895 dd = dvp->v_data;
896 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen, 0);
897 while (de == NULL) { /* While(...) so we can use break */
898
899 if (nameiop == DELETE)
900 return (ENOENT);
901
902 /*
903 * OK, we didn't have an entry for the name we were asked for
904 * so we try to see if anybody can create it on demand.
905 */
906 pname = devfs_fqpn(specname, dmp, dd, cnp);
907 if (pname == NULL)
908 break;
909
910 cdev = NULL;
911 DEVFS_DMP_HOLD(dmp);
912 sx_xunlock(&dmp->dm_lock);
913 sx_slock(&clone_drain_lock);
914 EVENTHANDLER_INVOKE(dev_clone,
915 td->td_ucred, pname, strlen(pname), &cdev);
916 sx_sunlock(&clone_drain_lock);
917
918 if (cdev == NULL)
919 sx_xlock(&dmp->dm_lock);
920 else if (devfs_populate_vp(dvp) != 0) {
921 *dm_unlock = 0;
922 sx_xlock(&dmp->dm_lock);
923 if (DEVFS_DMP_DROP(dmp)) {
924 sx_xunlock(&dmp->dm_lock);
925 devfs_unmount_final(dmp);
926 } else
927 sx_xunlock(&dmp->dm_lock);
928 dev_rel(cdev);
929 return (ENOENT);
930 }
931 if (DEVFS_DMP_DROP(dmp)) {
932 *dm_unlock = 0;
933 sx_xunlock(&dmp->dm_lock);
934 devfs_unmount_final(dmp);
935 if (cdev != NULL)
936 dev_rel(cdev);
937 return (ENOENT);
938 }
939
940 if (cdev == NULL)
941 break;
942
943 dev_lock();
944 dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx];
945 if (dde != NULL && *dde != NULL)
946 de = *dde;
947 dev_unlock();
948 dev_rel(cdev);
949 break;
950 }
951
952 if (de == NULL || de->de_flags & DE_WHITEOUT) {
953 if ((nameiop == CREATE || nameiop == RENAME) &&
954 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) {
955 cnp->cn_flags |= SAVENAME;
956 return (EJUSTRETURN);
957 }
958 return (ENOENT);
959 }
960
961 if (devfs_prison_check(de, td))
962 return (ENOENT);
963
964 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) {
965 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
966 if (error)
967 return (error);
968 if (*vpp == dvp) {
969 VREF(dvp);
970 *vpp = dvp;
971 return (0);
972 }
973 }
974 error = devfs_allocv(de, dvp->v_mount, cnp->cn_lkflags & LK_TYPE_MASK,
975 vpp);
976 *dm_unlock = 0;
977 return (error);
978}
979
980static int
981devfs_lookup(struct vop_lookup_args *ap)
982{
983 int j;
984 struct devfs_mount *dmp;
985 int dm_unlock;
986
987 if (devfs_populate_vp(ap->a_dvp) != 0)
988 return (ENOTDIR);
989
990 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
991 dm_unlock = 1;
992 j = devfs_lookupx(ap, &dm_unlock);
993 if (dm_unlock == 1)
994 sx_xunlock(&dmp->dm_lock);
995 return (j);
996}
997
998static int
999devfs_mknod(struct vop_mknod_args *ap)
1000{
1001 struct componentname *cnp;
1002 struct vnode *dvp, **vpp;
1003 struct devfs_dirent *dd, *de;
1004 struct devfs_mount *dmp;
1005 int error;
1006
1007 /*
1008 * The only type of node we should be creating here is a
1009 * character device, for anything else return EOPNOTSUPP.
1010 */
1011 if (ap->a_vap->va_type != VCHR)
1012 return (EOPNOTSUPP);
1013 dvp = ap->a_dvp;
1014 dmp = VFSTODEVFS(dvp->v_mount);
1015
1016 cnp = ap->a_cnp;
1017 vpp = ap->a_vpp;
1018 dd = dvp->v_data;
1019
1020 error = ENOENT;
1021 sx_xlock(&dmp->dm_lock);
1022 TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
1023 if (cnp->cn_namelen != de->de_dirent->d_namlen)
1024 continue;
1025 if (de->de_dirent->d_type == DT_CHR &&
1026 (de->de_cdp->cdp_flags & CDP_ACTIVE) == 0)
1027 continue;
1028 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name,
1029 de->de_dirent->d_namlen) != 0)
1030 continue;
1031 if (de->de_flags & DE_WHITEOUT)
1032 break;
1033 goto notfound;
1034 }
1035 if (de == NULL)
1036 goto notfound;
1037 de->de_flags &= ~DE_WHITEOUT;
1038 error = devfs_allocv(de, dvp->v_mount, LK_EXCLUSIVE, vpp);
1039 return (error);
1040notfound:
1041 sx_xunlock(&dmp->dm_lock);
1042 return (error);
1043}
1044
1045/* ARGSUSED */
1046static int
1047devfs_open(struct vop_open_args *ap)
1048{
1049 struct thread *td = ap->a_td;
1050 struct vnode *vp = ap->a_vp;
1051 struct cdev *dev = vp->v_rdev;
1052 struct file *fp = ap->a_fp;
1053 int error, ref, vlocked;
1054 struct cdevsw *dsw;
1055 struct file *fpop;
1056 struct mtx *mtxp;
1057
1058 if (vp->v_type == VBLK)
1059 return (ENXIO);
1060
1061 if (dev == NULL)
1062 return (ENXIO);
1063
1064 /* Make this field valid before any I/O in d_open. */
1065 if (dev->si_iosize_max == 0)
1066 dev->si_iosize_max = DFLTPHYS;
1067
1068 dsw = dev_refthread(dev, &ref);
1069 if (dsw == NULL)
1070 return (ENXIO);
1071 if (fp == NULL && dsw->d_fdopen != NULL) {
1072 dev_relthread(dev, ref);
1073 return (ENXIO);
1074 }
1075
1076 vlocked = VOP_ISLOCKED(vp);
1077 VOP_UNLOCK(vp, 0);
1078
1079 fpop = td->td_fpop;
1080 td->td_fpop = fp;
1081 if (fp != NULL) {
1082 fp->f_data = dev;
1083 fp->f_vnode = vp;
1084 }
1085 if (dsw->d_fdopen != NULL)
1086 error = dsw->d_fdopen(dev, ap->a_mode, td, fp);
1087 else
1088 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td);
1089 /* cleanup any cdevpriv upon error */
1090 if (error != 0)
1091 devfs_clear_cdevpriv();
1092 td->td_fpop = fpop;
1093
1094 vn_lock(vp, vlocked | LK_RETRY);
1095 dev_relthread(dev, ref);
1096 if (error != 0) {
1097 if (error == ERESTART)
1098 error = EINTR;
1099 return (error);
1100 }
1101
1102#if 0 /* /dev/console */
1103 KASSERT(fp != NULL, ("Could not vnode bypass device on NULL fp"));
1104#else
1105 if (fp == NULL)
1106 return (error);
1107#endif
1108 if (fp->f_ops == &badfileops)
1109 finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f);
1110 mtxp = mtx_pool_find(mtxpool_sleep, fp);
1111
1112 /*
1113 * Hint to the dofilewrite() to not force the buffer draining
1114 * on the writer to the file. Most likely, the write would
1115 * not need normal buffers.
1116 */
1117 mtx_lock(mtxp);
1118 fp->f_vnread_flags |= FDEVFS_VNODE;
1119 mtx_unlock(mtxp);
1120 return (error);
1121}
1122
1123static int
1124devfs_pathconf(struct vop_pathconf_args *ap)
1125{
1126
1127 switch (ap->a_name) {
1128 case _PC_MAC_PRESENT:
1129#ifdef MAC
1130 /*
1131 * If MAC is enabled, devfs automatically supports
1132 * trivial non-persistant label storage.
1133 */
1134 *ap->a_retval = 1;
1135#else
1136 *ap->a_retval = 0;
1137#endif
1138 return (0);
1139 default:
1140 return (vop_stdpathconf(ap));
1141 }
1142 /* NOTREACHED */
1143}
1144
1145/* ARGSUSED */
1146static int
1147devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td)
1148{
1149 struct cdev *dev;
1150 struct cdevsw *dsw;
1151 int error, ref;
1152 struct file *fpop;
1153
1154 fpop = td->td_fpop;
1155 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1156 if (error != 0) {
1157 error = vnops.fo_poll(fp, events, cred, td);
1158 return (error);
1159 }
1160 error = dsw->d_poll(dev, events, td);
1161 td->td_fpop = fpop;
1162 dev_relthread(dev, ref);
1163 return(error);
1164}
1165
1166/*
1167 * Print out the contents of a special device vnode.
1168 */
1169static int
1170devfs_print(struct vop_print_args *ap)
1171{
1172
1173 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev));
1174 return (0);
1175}
1176
1177static int
1178devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred,
1179 int flags, struct thread *td)
1180{
1181 struct cdev *dev;
1182 int ioflag, error, ref;
1183 ssize_t resid;
1184 struct cdevsw *dsw;
1185 struct file *fpop;
1186
1187 if (uio->uio_resid > DEVFS_IOSIZE_MAX)
1188 return (EINVAL);
1189 fpop = td->td_fpop;
1190 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1191 if (error != 0) {
1192 error = vnops.fo_read(fp, uio, cred, flags, td);
1193 return (error);
1194 }
1195 resid = uio->uio_resid;
1196 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT);
1197 if (ioflag & O_DIRECT)
1198 ioflag |= IO_DIRECT;
1199
1200 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK);
1201 error = dsw->d_read(dev, uio, ioflag);
1202 if (uio->uio_resid != resid || (error == 0 && resid != 0))
| 109static int
110devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp,
111 int *ref)
112{
113
114 *dswp = devvn_refthread(fp->f_vnode, devp, ref);
115 if (*devp != fp->f_data) {
116 if (*dswp != NULL)
117 dev_relthread(*devp, *ref);
118 return (ENXIO);
119 }
120 KASSERT((*devp)->si_refcount > 0,
121 ("devfs: un-referenced struct cdev *(%s)", devtoname(*devp)));
122 if (*dswp == NULL)
123 return (ENXIO);
124 curthread->td_fpop = fp;
125 return (0);
126}
127
128int
129devfs_get_cdevpriv(void **datap)
130{
131 struct file *fp;
132 struct cdev_privdata *p;
133 int error;
134
135 fp = curthread->td_fpop;
136 if (fp == NULL)
137 return (EBADF);
138 p = fp->f_cdevpriv;
139 if (p != NULL) {
140 error = 0;
141 *datap = p->cdpd_data;
142 } else
143 error = ENOENT;
144 return (error);
145}
146
147int
148devfs_set_cdevpriv(void *priv, cdevpriv_dtr_t priv_dtr)
149{
150 struct file *fp;
151 struct cdev_priv *cdp;
152 struct cdev_privdata *p;
153 int error;
154
155 fp = curthread->td_fpop;
156 if (fp == NULL)
157 return (ENOENT);
158 cdp = cdev2priv((struct cdev *)fp->f_data);
159 p = malloc(sizeof(struct cdev_privdata), M_CDEVPDATA, M_WAITOK);
160 p->cdpd_data = priv;
161 p->cdpd_dtr = priv_dtr;
162 p->cdpd_fp = fp;
163 mtx_lock(&cdevpriv_mtx);
164 if (fp->f_cdevpriv == NULL) {
165 LIST_INSERT_HEAD(&cdp->cdp_fdpriv, p, cdpd_list);
166 fp->f_cdevpriv = p;
167 mtx_unlock(&cdevpriv_mtx);
168 error = 0;
169 } else {
170 mtx_unlock(&cdevpriv_mtx);
171 free(p, M_CDEVPDATA);
172 error = EBUSY;
173 }
174 return (error);
175}
176
177void
178devfs_destroy_cdevpriv(struct cdev_privdata *p)
179{
180
181 mtx_assert(&cdevpriv_mtx, MA_OWNED);
182 p->cdpd_fp->f_cdevpriv = NULL;
183 LIST_REMOVE(p, cdpd_list);
184 mtx_unlock(&cdevpriv_mtx);
185 (p->cdpd_dtr)(p->cdpd_data);
186 free(p, M_CDEVPDATA);
187}
188
189void
190devfs_fpdrop(struct file *fp)
191{
192 struct cdev_privdata *p;
193
194 mtx_lock(&cdevpriv_mtx);
195 if ((p = fp->f_cdevpriv) == NULL) {
196 mtx_unlock(&cdevpriv_mtx);
197 return;
198 }
199 devfs_destroy_cdevpriv(p);
200}
201
202void
203devfs_clear_cdevpriv(void)
204{
205 struct file *fp;
206
207 fp = curthread->td_fpop;
208 if (fp == NULL)
209 return;
210 devfs_fpdrop(fp);
211}
212
213/*
214 * On success devfs_populate_vp() returns with dmp->dm_lock held.
215 */
216static int
217devfs_populate_vp(struct vnode *vp)
218{
219 struct devfs_dirent *de;
220 struct devfs_mount *dmp;
221 int locked;
222
223 ASSERT_VOP_LOCKED(vp, "devfs_populate_vp");
224
225 dmp = VFSTODEVFS(vp->v_mount);
226 locked = VOP_ISLOCKED(vp);
227
228 sx_xlock(&dmp->dm_lock);
229 DEVFS_DMP_HOLD(dmp);
230
231 /* Can't call devfs_populate() with the vnode lock held. */
232 VOP_UNLOCK(vp, 0);
233 devfs_populate(dmp);
234
235 sx_xunlock(&dmp->dm_lock);
236 vn_lock(vp, locked | LK_RETRY);
237 sx_xlock(&dmp->dm_lock);
238 if (DEVFS_DMP_DROP(dmp)) {
239 sx_xunlock(&dmp->dm_lock);
240 devfs_unmount_final(dmp);
241 return (EBADF);
242 }
243 if ((vp->v_iflag & VI_DOOMED) != 0) {
244 sx_xunlock(&dmp->dm_lock);
245 return (EBADF);
246 }
247 de = vp->v_data;
248 KASSERT(de != NULL,
249 ("devfs_populate_vp: vp->v_data == NULL but vnode not doomed"));
250 if ((de->de_flags & DE_DOOMED) != 0) {
251 sx_xunlock(&dmp->dm_lock);
252 return (EBADF);
253 }
254
255 return (0);
256}
257
258static int
259devfs_vptocnp(struct vop_vptocnp_args *ap)
260{
261 struct vnode *vp = ap->a_vp;
262 struct vnode **dvp = ap->a_vpp;
263 struct devfs_mount *dmp;
264 char *buf = ap->a_buf;
265 int *buflen = ap->a_buflen;
266 struct devfs_dirent *dd, *de;
267 int i, error;
268
269 dmp = VFSTODEVFS(vp->v_mount);
270
271 error = devfs_populate_vp(vp);
272 if (error != 0)
273 return (error);
274
275 i = *buflen;
276 dd = vp->v_data;
277
278 if (vp->v_type == VCHR) {
279 i -= strlen(dd->de_cdp->cdp_c.si_name);
280 if (i < 0) {
281 error = ENOMEM;
282 goto finished;
283 }
284 bcopy(dd->de_cdp->cdp_c.si_name, buf + i,
285 strlen(dd->de_cdp->cdp_c.si_name));
286 de = dd->de_dir;
287 } else if (vp->v_type == VDIR) {
288 if (dd == dmp->dm_rootdir) {
289 *dvp = vp;
290 vref(*dvp);
291 goto finished;
292 }
293 i -= dd->de_dirent->d_namlen;
294 if (i < 0) {
295 error = ENOMEM;
296 goto finished;
297 }
298 bcopy(dd->de_dirent->d_name, buf + i,
299 dd->de_dirent->d_namlen);
300 de = dd;
301 } else {
302 error = ENOENT;
303 goto finished;
304 }
305 *buflen = i;
306 de = devfs_parent_dirent(de);
307 if (de == NULL) {
308 error = ENOENT;
309 goto finished;
310 }
311 mtx_lock(&devfs_de_interlock);
312 *dvp = de->de_vnode;
313 if (*dvp != NULL) {
314 VI_LOCK(*dvp);
315 mtx_unlock(&devfs_de_interlock);
316 vholdl(*dvp);
317 VI_UNLOCK(*dvp);
318 vref(*dvp);
319 vdrop(*dvp);
320 } else {
321 mtx_unlock(&devfs_de_interlock);
322 error = ENOENT;
323 }
324finished:
325 sx_xunlock(&dmp->dm_lock);
326 return (error);
327}
328
329/*
330 * Construct the fully qualified path name relative to the mountpoint.
331 * If a NULL cnp is provided, no '/' is appended to the resulting path.
332 */
333char *
334devfs_fqpn(char *buf, struct devfs_mount *dmp, struct devfs_dirent *dd,
335 struct componentname *cnp)
336{
337 int i;
338 struct devfs_dirent *de;
339
340 sx_assert(&dmp->dm_lock, SA_LOCKED);
341
342 i = SPECNAMELEN;
343 buf[i] = '\0';
344 if (cnp != NULL)
345 i -= cnp->cn_namelen;
346 if (i < 0)
347 return (NULL);
348 if (cnp != NULL)
349 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen);
350 de = dd;
351 while (de != dmp->dm_rootdir) {
352 if (cnp != NULL || i < SPECNAMELEN) {
353 i--;
354 if (i < 0)
355 return (NULL);
356 buf[i] = '/';
357 }
358 i -= de->de_dirent->d_namlen;
359 if (i < 0)
360 return (NULL);
361 bcopy(de->de_dirent->d_name, buf + i,
362 de->de_dirent->d_namlen);
363 de = devfs_parent_dirent(de);
364 if (de == NULL)
365 return (NULL);
366 }
367 return (buf + i);
368}
369
370static int
371devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp,
372 struct devfs_dirent *de)
373{
374 int not_found;
375
376 not_found = 0;
377 if (de->de_flags & DE_DOOMED)
378 not_found = 1;
379 if (DEVFS_DE_DROP(de)) {
380 KASSERT(not_found == 1, ("DEVFS de dropped but not doomed"));
381 devfs_dirent_free(de);
382 }
383 if (DEVFS_DMP_DROP(dmp)) {
384 KASSERT(not_found == 1,
385 ("DEVFS mount struct freed before dirent"));
386 not_found = 2;
387 sx_xunlock(&dmp->dm_lock);
388 devfs_unmount_final(dmp);
389 }
390 if (not_found == 1 || (drop_dm_lock && not_found != 2))
391 sx_unlock(&dmp->dm_lock);
392 return (not_found);
393}
394
395static void
396devfs_insmntque_dtr(struct vnode *vp, void *arg)
397{
398 struct devfs_dirent *de;
399
400 de = (struct devfs_dirent *)arg;
401 mtx_lock(&devfs_de_interlock);
402 vp->v_data = NULL;
403 de->de_vnode = NULL;
404 mtx_unlock(&devfs_de_interlock);
405 vgone(vp);
406 vput(vp);
407}
408
409/*
410 * devfs_allocv shall be entered with dmp->dm_lock held, and it drops
411 * it on return.
412 */
413int
414devfs_allocv(struct devfs_dirent *de, struct mount *mp, int lockmode,
415 struct vnode **vpp)
416{
417 int error;
418 struct vnode *vp;
419 struct cdev *dev;
420 struct devfs_mount *dmp;
421 struct cdevsw *dsw;
422
423 dmp = VFSTODEVFS(mp);
424 if (de->de_flags & DE_DOOMED) {
425 sx_xunlock(&dmp->dm_lock);
426 return (ENOENT);
427 }
428loop:
429 DEVFS_DE_HOLD(de);
430 DEVFS_DMP_HOLD(dmp);
431 mtx_lock(&devfs_de_interlock);
432 vp = de->de_vnode;
433 if (vp != NULL) {
434 VI_LOCK(vp);
435 mtx_unlock(&devfs_de_interlock);
436 sx_xunlock(&dmp->dm_lock);
437 vget(vp, lockmode | LK_INTERLOCK | LK_RETRY, curthread);
438 sx_xlock(&dmp->dm_lock);
439 if (devfs_allocv_drop_refs(0, dmp, de)) {
440 vput(vp);
441 return (ENOENT);
442 }
443 else if ((vp->v_iflag & VI_DOOMED) != 0) {
444 mtx_lock(&devfs_de_interlock);
445 if (de->de_vnode == vp) {
446 de->de_vnode = NULL;
447 vp->v_data = NULL;
448 }
449 mtx_unlock(&devfs_de_interlock);
450 vput(vp);
451 goto loop;
452 }
453 sx_xunlock(&dmp->dm_lock);
454 *vpp = vp;
455 return (0);
456 }
457 mtx_unlock(&devfs_de_interlock);
458 if (de->de_dirent->d_type == DT_CHR) {
459 if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) {
460 devfs_allocv_drop_refs(1, dmp, de);
461 return (ENOENT);
462 }
463 dev = &de->de_cdp->cdp_c;
464 } else {
465 dev = NULL;
466 }
467 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp);
468 if (error != 0) {
469 devfs_allocv_drop_refs(1, dmp, de);
470 printf("devfs_allocv: failed to allocate new vnode\n");
471 return (error);
472 }
473
474 if (de->de_dirent->d_type == DT_CHR) {
475 vp->v_type = VCHR;
476 VI_LOCK(vp);
477 dev_lock();
478 dev_refl(dev);
479 /* XXX: v_rdev should be protect by vnode lock */
480 vp->v_rdev = dev;
481 KASSERT(vp->v_usecount == 1,
482 ("%s %d (%d)\n", __func__, __LINE__, vp->v_usecount));
483 dev->si_usecount += vp->v_usecount;
484 /* Special casing of ttys for deadfs. Probably redundant. */
485 dsw = dev->si_devsw;
486 if (dsw != NULL && (dsw->d_flags & D_TTY) != 0)
487 vp->v_vflag |= VV_ISTTY;
488 dev_unlock();
489 VI_UNLOCK(vp);
490 if ((dev->si_flags & SI_ETERNAL) != 0)
491 vp->v_vflag |= VV_ETERNALDEV;
492 vp->v_op = &devfs_specops;
493 } else if (de->de_dirent->d_type == DT_DIR) {
494 vp->v_type = VDIR;
495 } else if (de->de_dirent->d_type == DT_LNK) {
496 vp->v_type = VLNK;
497 } else {
498 vp->v_type = VBAD;
499 }
500 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS);
501 VN_LOCK_ASHARE(vp);
502 mtx_lock(&devfs_de_interlock);
503 vp->v_data = de;
504 de->de_vnode = vp;
505 mtx_unlock(&devfs_de_interlock);
506 error = insmntque1(vp, mp, devfs_insmntque_dtr, de);
507 if (error != 0) {
508 (void) devfs_allocv_drop_refs(1, dmp, de);
509 return (error);
510 }
511 if (devfs_allocv_drop_refs(0, dmp, de)) {
512 vput(vp);
513 return (ENOENT);
514 }
515#ifdef MAC
516 mac_devfs_vnode_associate(mp, de, vp);
517#endif
518 sx_xunlock(&dmp->dm_lock);
519 *vpp = vp;
520 return (0);
521}
522
523static int
524devfs_access(struct vop_access_args *ap)
525{
526 struct vnode *vp = ap->a_vp;
527 struct devfs_dirent *de;
528 int error;
529
530 de = vp->v_data;
531 if (vp->v_type == VDIR)
532 de = de->de_dir;
533
534 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid,
535 ap->a_accmode, ap->a_cred, NULL);
536 if (error == 0)
537 return (0);
538 if (error != EACCES)
539 return (error);
540 /* We do, however, allow access to the controlling terminal */
541 if (!(ap->a_td->td_proc->p_flag & P_CONTROLT))
542 return (error);
543 if (ap->a_td->td_proc->p_session->s_ttydp == de->de_cdp)
544 return (0);
545 return (error);
546}
547
548/* ARGSUSED */
549static int
550devfs_close(struct vop_close_args *ap)
551{
552 struct vnode *vp = ap->a_vp, *oldvp;
553 struct thread *td = ap->a_td;
554 struct cdev *dev = vp->v_rdev;
555 struct cdevsw *dsw;
556 int vp_locked, error, ref;
557
558 /*
559 * XXX: Don't call d_close() if we were called because of
560 * XXX: insmntque1() failure.
561 */
562 if (vp->v_data == NULL)
563 return (0);
564
565 /*
566 * Hack: a tty device that is a controlling terminal
567 * has a reference from the session structure.
568 * We cannot easily tell that a character device is
569 * a controlling terminal, unless it is the closing
570 * process' controlling terminal. In that case,
571 * if the reference count is 2 (this last descriptor
572 * plus the session), release the reference from the session.
573 */
574 oldvp = NULL;
575 sx_xlock(&proctree_lock);
576 if (td && vp == td->td_proc->p_session->s_ttyvp) {
577 SESS_LOCK(td->td_proc->p_session);
578 VI_LOCK(vp);
579 if (count_dev(dev) == 2 && (vp->v_iflag & VI_DOOMED) == 0) {
580 td->td_proc->p_session->s_ttyvp = NULL;
581 td->td_proc->p_session->s_ttydp = NULL;
582 oldvp = vp;
583 }
584 VI_UNLOCK(vp);
585 SESS_UNLOCK(td->td_proc->p_session);
586 }
587 sx_xunlock(&proctree_lock);
588 if (oldvp != NULL)
589 vrele(oldvp);
590 /*
591 * We do not want to really close the device if it
592 * is still in use unless we are trying to close it
593 * forcibly. Since every use (buffer, vnode, swap, cmap)
594 * holds a reference to the vnode, and because we mark
595 * any other vnodes that alias this device, when the
596 * sum of the reference counts on all the aliased
597 * vnodes descends to one, we are on last close.
598 */
599 dsw = dev_refthread(dev, &ref);
600 if (dsw == NULL)
601 return (ENXIO);
602 VI_LOCK(vp);
603 if (vp->v_iflag & VI_DOOMED) {
604 /* Forced close. */
605 } else if (dsw->d_flags & D_TRACKCLOSE) {
606 /* Keep device updated on status. */
607 } else if (count_dev(dev) > 1) {
608 VI_UNLOCK(vp);
609 dev_relthread(dev, ref);
610 return (0);
611 }
612 vholdl(vp);
613 VI_UNLOCK(vp);
614 vp_locked = VOP_ISLOCKED(vp);
615 VOP_UNLOCK(vp, 0);
616 KASSERT(dev->si_refcount > 0,
617 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev)));
618 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td);
619 dev_relthread(dev, ref);
620 vn_lock(vp, vp_locked | LK_RETRY);
621 vdrop(vp);
622 return (error);
623}
624
625static int
626devfs_close_f(struct file *fp, struct thread *td)
627{
628 int error;
629 struct file *fpop;
630
631 /*
632 * NB: td may be NULL if this descriptor is closed due to
633 * garbage collection from a closed UNIX domain socket.
634 */
635 fpop = curthread->td_fpop;
636 curthread->td_fpop = fp;
637 error = vnops.fo_close(fp, td);
638 curthread->td_fpop = fpop;
639
640 /*
641 * The f_cdevpriv cannot be assigned non-NULL value while we
642 * are destroying the file.
643 */
644 if (fp->f_cdevpriv != NULL)
645 devfs_fpdrop(fp);
646 return (error);
647}
648
649static int
650devfs_fsync(struct vop_fsync_args *ap)
651{
652 int error;
653 struct bufobj *bo;
654 struct devfs_dirent *de;
655
656 if (!vn_isdisk(ap->a_vp, &error)) {
657 bo = &ap->a_vp->v_bufobj;
658 de = ap->a_vp->v_data;
659 if (error == ENXIO && bo->bo_dirty.bv_cnt > 0) {
660 printf("Device %s went missing before all of the data "
661 "could be written to it; expect data loss.\n",
662 de->de_dirent->d_name);
663
664 error = vop_stdfsync(ap);
665 if (bo->bo_dirty.bv_cnt != 0 || error != 0)
666 panic("devfs_fsync: vop_stdfsync failed.");
667 }
668
669 return (0);
670 }
671
672 return (vop_stdfsync(ap));
673}
674
675static int
676devfs_getattr(struct vop_getattr_args *ap)
677{
678 struct vnode *vp = ap->a_vp;
679 struct vattr *vap = ap->a_vap;
680 int error;
681 struct devfs_dirent *de;
682 struct devfs_mount *dmp;
683 struct cdev *dev;
684
685 error = devfs_populate_vp(vp);
686 if (error != 0)
687 return (error);
688
689 dmp = VFSTODEVFS(vp->v_mount);
690 sx_xunlock(&dmp->dm_lock);
691
692 de = vp->v_data;
693 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp));
694 if (vp->v_type == VDIR) {
695 de = de->de_dir;
696 KASSERT(de != NULL,
697 ("Null dir dirent in devfs_getattr vp=%p", vp));
698 }
699 vap->va_uid = de->de_uid;
700 vap->va_gid = de->de_gid;
701 vap->va_mode = de->de_mode;
702 if (vp->v_type == VLNK)
703 vap->va_size = strlen(de->de_symlink);
704 else if (vp->v_type == VDIR)
705 vap->va_size = vap->va_bytes = DEV_BSIZE;
706 else
707 vap->va_size = 0;
708 if (vp->v_type != VDIR)
709 vap->va_bytes = 0;
710 vap->va_blocksize = DEV_BSIZE;
711 vap->va_type = vp->v_type;
712
713#define fix(aa) \
714 do { \
715 if ((aa).tv_sec <= 3600) { \
716 (aa).tv_sec = boottime.tv_sec; \
717 (aa).tv_nsec = boottime.tv_usec * 1000; \
718 } \
719 } while (0)
720
721 if (vp->v_type != VCHR) {
722 fix(de->de_atime);
723 vap->va_atime = de->de_atime;
724 fix(de->de_mtime);
725 vap->va_mtime = de->de_mtime;
726 fix(de->de_ctime);
727 vap->va_ctime = de->de_ctime;
728 } else {
729 dev = vp->v_rdev;
730 fix(dev->si_atime);
731 vap->va_atime = dev->si_atime;
732 fix(dev->si_mtime);
733 vap->va_mtime = dev->si_mtime;
734 fix(dev->si_ctime);
735 vap->va_ctime = dev->si_ctime;
736
737 vap->va_rdev = cdev2priv(dev)->cdp_inode;
738 }
739 vap->va_gen = 0;
740 vap->va_flags = 0;
741 vap->va_filerev = 0;
742 vap->va_nlink = de->de_links;
743 vap->va_fileid = de->de_inode;
744
745 return (error);
746}
747
748/* ARGSUSED */
749static int
750devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td)
751{
752 struct cdev *dev;
753 struct cdevsw *dsw;
754 struct vnode *vp;
755 struct vnode *vpold;
756 int error, i, ref;
757 const char *p;
758 struct fiodgname_arg *fgn;
759 struct file *fpop;
760
761 fpop = td->td_fpop;
762 error = devfs_fp_check(fp, &dev, &dsw, &ref);
763 if (error != 0) {
764 error = vnops.fo_ioctl(fp, com, data, cred, td);
765 return (error);
766 }
767
768 if (com == FIODTYPE) {
769 *(int *)data = dsw->d_flags & D_TYPEMASK;
770 td->td_fpop = fpop;
771 dev_relthread(dev, ref);
772 return (0);
773 } else if (com == FIODGNAME) {
774 fgn = data;
775 p = devtoname(dev);
776 i = strlen(p) + 1;
777 if (i > fgn->len)
778 error = EINVAL;
779 else
780 error = copyout(p, fgn->buf, i);
781 td->td_fpop = fpop;
782 dev_relthread(dev, ref);
783 return (error);
784 }
785 error = dsw->d_ioctl(dev, com, data, fp->f_flag, td);
786 td->td_fpop = NULL;
787 dev_relthread(dev, ref);
788 if (error == ENOIOCTL)
789 error = ENOTTY;
790 if (error == 0 && com == TIOCSCTTY) {
791 vp = fp->f_vnode;
792
793 /* Do nothing if reassigning same control tty */
794 sx_slock(&proctree_lock);
795 if (td->td_proc->p_session->s_ttyvp == vp) {
796 sx_sunlock(&proctree_lock);
797 return (0);
798 }
799
800 vpold = td->td_proc->p_session->s_ttyvp;
801 VREF(vp);
802 SESS_LOCK(td->td_proc->p_session);
803 td->td_proc->p_session->s_ttyvp = vp;
804 td->td_proc->p_session->s_ttydp = cdev2priv(dev);
805 SESS_UNLOCK(td->td_proc->p_session);
806
807 sx_sunlock(&proctree_lock);
808
809 /* Get rid of reference to old control tty */
810 if (vpold)
811 vrele(vpold);
812 }
813 return (error);
814}
815
816/* ARGSUSED */
817static int
818devfs_kqfilter_f(struct file *fp, struct knote *kn)
819{
820 struct cdev *dev;
821 struct cdevsw *dsw;
822 int error, ref;
823 struct file *fpop;
824 struct thread *td;
825
826 td = curthread;
827 fpop = td->td_fpop;
828 error = devfs_fp_check(fp, &dev, &dsw, &ref);
829 if (error)
830 return (error);
831 error = dsw->d_kqfilter(dev, kn);
832 td->td_fpop = fpop;
833 dev_relthread(dev, ref);
834 return (error);
835}
836
837static inline int
838devfs_prison_check(struct devfs_dirent *de, struct thread *td)
839{
840 struct cdev_priv *cdp;
841 struct ucred *dcr;
842 int error;
843
844 cdp = de->de_cdp;
845 if (cdp == NULL)
846 return (0);
847 dcr = cdp->cdp_c.si_cred;
848 if (dcr == NULL)
849 return (0);
850
851 error = prison_check(td->td_ucred, dcr);
852 if (error == 0)
853 return (0);
854 /* We do, however, allow access to the controlling terminal */
855 if (!(td->td_proc->p_flag & P_CONTROLT))
856 return (error);
857 if (td->td_proc->p_session->s_ttydp == cdp)
858 return (0);
859 return (error);
860}
861
862static int
863devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock)
864{
865 struct componentname *cnp;
866 struct vnode *dvp, **vpp;
867 struct thread *td;
868 struct devfs_dirent *de, *dd;
869 struct devfs_dirent **dde;
870 struct devfs_mount *dmp;
871 struct cdev *cdev;
872 int error, flags, nameiop, dvplocked;
873 char specname[SPECNAMELEN + 1], *pname;
874
875 cnp = ap->a_cnp;
876 vpp = ap->a_vpp;
877 dvp = ap->a_dvp;
878 pname = cnp->cn_nameptr;
879 td = cnp->cn_thread;
880 flags = cnp->cn_flags;
881 nameiop = cnp->cn_nameiop;
882 dmp = VFSTODEVFS(dvp->v_mount);
883 dd = dvp->v_data;
884 *vpp = NULLVP;
885
886 if ((flags & ISLASTCN) && nameiop == RENAME)
887 return (EOPNOTSUPP);
888
889 if (dvp->v_type != VDIR)
890 return (ENOTDIR);
891
892 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT))
893 return (EIO);
894
895 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td);
896 if (error)
897 return (error);
898
899 if (cnp->cn_namelen == 1 && *pname == '.') {
900 if ((flags & ISLASTCN) && nameiop != LOOKUP)
901 return (EINVAL);
902 *vpp = dvp;
903 VREF(dvp);
904 return (0);
905 }
906
907 if (flags & ISDOTDOT) {
908 if ((flags & ISLASTCN) && nameiop != LOOKUP)
909 return (EINVAL);
910 de = devfs_parent_dirent(dd);
911 if (de == NULL)
912 return (ENOENT);
913 dvplocked = VOP_ISLOCKED(dvp);
914 VOP_UNLOCK(dvp, 0);
915 error = devfs_allocv(de, dvp->v_mount,
916 cnp->cn_lkflags & LK_TYPE_MASK, vpp);
917 *dm_unlock = 0;
918 vn_lock(dvp, dvplocked | LK_RETRY);
919 return (error);
920 }
921
922 dd = dvp->v_data;
923 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen, 0);
924 while (de == NULL) { /* While(...) so we can use break */
925
926 if (nameiop == DELETE)
927 return (ENOENT);
928
929 /*
930 * OK, we didn't have an entry for the name we were asked for
931 * so we try to see if anybody can create it on demand.
932 */
933 pname = devfs_fqpn(specname, dmp, dd, cnp);
934 if (pname == NULL)
935 break;
936
937 cdev = NULL;
938 DEVFS_DMP_HOLD(dmp);
939 sx_xunlock(&dmp->dm_lock);
940 sx_slock(&clone_drain_lock);
941 EVENTHANDLER_INVOKE(dev_clone,
942 td->td_ucred, pname, strlen(pname), &cdev);
943 sx_sunlock(&clone_drain_lock);
944
945 if (cdev == NULL)
946 sx_xlock(&dmp->dm_lock);
947 else if (devfs_populate_vp(dvp) != 0) {
948 *dm_unlock = 0;
949 sx_xlock(&dmp->dm_lock);
950 if (DEVFS_DMP_DROP(dmp)) {
951 sx_xunlock(&dmp->dm_lock);
952 devfs_unmount_final(dmp);
953 } else
954 sx_xunlock(&dmp->dm_lock);
955 dev_rel(cdev);
956 return (ENOENT);
957 }
958 if (DEVFS_DMP_DROP(dmp)) {
959 *dm_unlock = 0;
960 sx_xunlock(&dmp->dm_lock);
961 devfs_unmount_final(dmp);
962 if (cdev != NULL)
963 dev_rel(cdev);
964 return (ENOENT);
965 }
966
967 if (cdev == NULL)
968 break;
969
970 dev_lock();
971 dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx];
972 if (dde != NULL && *dde != NULL)
973 de = *dde;
974 dev_unlock();
975 dev_rel(cdev);
976 break;
977 }
978
979 if (de == NULL || de->de_flags & DE_WHITEOUT) {
980 if ((nameiop == CREATE || nameiop == RENAME) &&
981 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) {
982 cnp->cn_flags |= SAVENAME;
983 return (EJUSTRETURN);
984 }
985 return (ENOENT);
986 }
987
988 if (devfs_prison_check(de, td))
989 return (ENOENT);
990
991 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) {
992 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
993 if (error)
994 return (error);
995 if (*vpp == dvp) {
996 VREF(dvp);
997 *vpp = dvp;
998 return (0);
999 }
1000 }
1001 error = devfs_allocv(de, dvp->v_mount, cnp->cn_lkflags & LK_TYPE_MASK,
1002 vpp);
1003 *dm_unlock = 0;
1004 return (error);
1005}
1006
1007static int
1008devfs_lookup(struct vop_lookup_args *ap)
1009{
1010 int j;
1011 struct devfs_mount *dmp;
1012 int dm_unlock;
1013
1014 if (devfs_populate_vp(ap->a_dvp) != 0)
1015 return (ENOTDIR);
1016
1017 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
1018 dm_unlock = 1;
1019 j = devfs_lookupx(ap, &dm_unlock);
1020 if (dm_unlock == 1)
1021 sx_xunlock(&dmp->dm_lock);
1022 return (j);
1023}
1024
1025static int
1026devfs_mknod(struct vop_mknod_args *ap)
1027{
1028 struct componentname *cnp;
1029 struct vnode *dvp, **vpp;
1030 struct devfs_dirent *dd, *de;
1031 struct devfs_mount *dmp;
1032 int error;
1033
1034 /*
1035 * The only type of node we should be creating here is a
1036 * character device, for anything else return EOPNOTSUPP.
1037 */
1038 if (ap->a_vap->va_type != VCHR)
1039 return (EOPNOTSUPP);
1040 dvp = ap->a_dvp;
1041 dmp = VFSTODEVFS(dvp->v_mount);
1042
1043 cnp = ap->a_cnp;
1044 vpp = ap->a_vpp;
1045 dd = dvp->v_data;
1046
1047 error = ENOENT;
1048 sx_xlock(&dmp->dm_lock);
1049 TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
1050 if (cnp->cn_namelen != de->de_dirent->d_namlen)
1051 continue;
1052 if (de->de_dirent->d_type == DT_CHR &&
1053 (de->de_cdp->cdp_flags & CDP_ACTIVE) == 0)
1054 continue;
1055 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name,
1056 de->de_dirent->d_namlen) != 0)
1057 continue;
1058 if (de->de_flags & DE_WHITEOUT)
1059 break;
1060 goto notfound;
1061 }
1062 if (de == NULL)
1063 goto notfound;
1064 de->de_flags &= ~DE_WHITEOUT;
1065 error = devfs_allocv(de, dvp->v_mount, LK_EXCLUSIVE, vpp);
1066 return (error);
1067notfound:
1068 sx_xunlock(&dmp->dm_lock);
1069 return (error);
1070}
1071
1072/* ARGSUSED */
1073static int
1074devfs_open(struct vop_open_args *ap)
1075{
1076 struct thread *td = ap->a_td;
1077 struct vnode *vp = ap->a_vp;
1078 struct cdev *dev = vp->v_rdev;
1079 struct file *fp = ap->a_fp;
1080 int error, ref, vlocked;
1081 struct cdevsw *dsw;
1082 struct file *fpop;
1083 struct mtx *mtxp;
1084
1085 if (vp->v_type == VBLK)
1086 return (ENXIO);
1087
1088 if (dev == NULL)
1089 return (ENXIO);
1090
1091 /* Make this field valid before any I/O in d_open. */
1092 if (dev->si_iosize_max == 0)
1093 dev->si_iosize_max = DFLTPHYS;
1094
1095 dsw = dev_refthread(dev, &ref);
1096 if (dsw == NULL)
1097 return (ENXIO);
1098 if (fp == NULL && dsw->d_fdopen != NULL) {
1099 dev_relthread(dev, ref);
1100 return (ENXIO);
1101 }
1102
1103 vlocked = VOP_ISLOCKED(vp);
1104 VOP_UNLOCK(vp, 0);
1105
1106 fpop = td->td_fpop;
1107 td->td_fpop = fp;
1108 if (fp != NULL) {
1109 fp->f_data = dev;
1110 fp->f_vnode = vp;
1111 }
1112 if (dsw->d_fdopen != NULL)
1113 error = dsw->d_fdopen(dev, ap->a_mode, td, fp);
1114 else
1115 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td);
1116 /* cleanup any cdevpriv upon error */
1117 if (error != 0)
1118 devfs_clear_cdevpriv();
1119 td->td_fpop = fpop;
1120
1121 vn_lock(vp, vlocked | LK_RETRY);
1122 dev_relthread(dev, ref);
1123 if (error != 0) {
1124 if (error == ERESTART)
1125 error = EINTR;
1126 return (error);
1127 }
1128
1129#if 0 /* /dev/console */
1130 KASSERT(fp != NULL, ("Could not vnode bypass device on NULL fp"));
1131#else
1132 if (fp == NULL)
1133 return (error);
1134#endif
1135 if (fp->f_ops == &badfileops)
1136 finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f);
1137 mtxp = mtx_pool_find(mtxpool_sleep, fp);
1138
1139 /*
1140 * Hint to the dofilewrite() to not force the buffer draining
1141 * on the writer to the file. Most likely, the write would
1142 * not need normal buffers.
1143 */
1144 mtx_lock(mtxp);
1145 fp->f_vnread_flags |= FDEVFS_VNODE;
1146 mtx_unlock(mtxp);
1147 return (error);
1148}
1149
1150static int
1151devfs_pathconf(struct vop_pathconf_args *ap)
1152{
1153
1154 switch (ap->a_name) {
1155 case _PC_MAC_PRESENT:
1156#ifdef MAC
1157 /*
1158 * If MAC is enabled, devfs automatically supports
1159 * trivial non-persistant label storage.
1160 */
1161 *ap->a_retval = 1;
1162#else
1163 *ap->a_retval = 0;
1164#endif
1165 return (0);
1166 default:
1167 return (vop_stdpathconf(ap));
1168 }
1169 /* NOTREACHED */
1170}
1171
1172/* ARGSUSED */
1173static int
1174devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td)
1175{
1176 struct cdev *dev;
1177 struct cdevsw *dsw;
1178 int error, ref;
1179 struct file *fpop;
1180
1181 fpop = td->td_fpop;
1182 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1183 if (error != 0) {
1184 error = vnops.fo_poll(fp, events, cred, td);
1185 return (error);
1186 }
1187 error = dsw->d_poll(dev, events, td);
1188 td->td_fpop = fpop;
1189 dev_relthread(dev, ref);
1190 return(error);
1191}
1192
1193/*
1194 * Print out the contents of a special device vnode.
1195 */
1196static int
1197devfs_print(struct vop_print_args *ap)
1198{
1199
1200 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev));
1201 return (0);
1202}
1203
1204static int
1205devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred,
1206 int flags, struct thread *td)
1207{
1208 struct cdev *dev;
1209 int ioflag, error, ref;
1210 ssize_t resid;
1211 struct cdevsw *dsw;
1212 struct file *fpop;
1213
1214 if (uio->uio_resid > DEVFS_IOSIZE_MAX)
1215 return (EINVAL);
1216 fpop = td->td_fpop;
1217 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1218 if (error != 0) {
1219 error = vnops.fo_read(fp, uio, cred, flags, td);
1220 return (error);
1221 }
1222 resid = uio->uio_resid;
1223 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT);
1224 if (ioflag & O_DIRECT)
1225 ioflag |= IO_DIRECT;
1226
1227 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK);
1228 error = dsw->d_read(dev, uio, ioflag);
1229 if (uio->uio_resid != resid || (error == 0 && resid != 0))
|
1203 vfs_timestamp(&dev->si_atime);
| 1230 devfs_timestamp(&dev->si_atime);
|
1204 td->td_fpop = fpop;
1205 dev_relthread(dev, ref);
1206
1207 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF);
1208 return (error);
1209}
1210
1211static int
1212devfs_readdir(struct vop_readdir_args *ap)
1213{
1214 int error;
1215 struct uio *uio;
1216 struct dirent *dp;
1217 struct devfs_dirent *dd;
1218 struct devfs_dirent *de;
1219 struct devfs_mount *dmp;
1220 off_t off;
1221 int *tmp_ncookies = NULL;
1222
1223 if (ap->a_vp->v_type != VDIR)
1224 return (ENOTDIR);
1225
1226 uio = ap->a_uio;
1227 if (uio->uio_offset < 0)
1228 return (EINVAL);
1229
1230 /*
1231 * XXX: This is a temporary hack to get around this filesystem not
1232 * supporting cookies. We store the location of the ncookies pointer
1233 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent()
1234 * and set the number of cookies to 0. We then set the pointer to
1235 * NULL so that vfs_read_dirent doesn't try to call realloc() on
1236 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies
1237 * pointer to its original location before returning to the caller.
1238 */
1239 if (ap->a_ncookies != NULL) {
1240 tmp_ncookies = ap->a_ncookies;
1241 *ap->a_ncookies = 0;
1242 ap->a_ncookies = NULL;
1243 }
1244
1245 dmp = VFSTODEVFS(ap->a_vp->v_mount);
1246 if (devfs_populate_vp(ap->a_vp) != 0) {
1247 if (tmp_ncookies != NULL)
1248 ap->a_ncookies = tmp_ncookies;
1249 return (EIO);
1250 }
1251 error = 0;
1252 de = ap->a_vp->v_data;
1253 off = 0;
1254 TAILQ_FOREACH(dd, &de->de_dlist, de_list) {
1255 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__));
1256 if (dd->de_flags & (DE_COVERED | DE_WHITEOUT))
1257 continue;
1258 if (devfs_prison_check(dd, uio->uio_td))
1259 continue;
1260 if (dd->de_dirent->d_type == DT_DIR)
1261 de = dd->de_dir;
1262 else
1263 de = dd;
1264 dp = dd->de_dirent;
1265 if (dp->d_reclen > uio->uio_resid)
1266 break;
1267 dp->d_fileno = de->de_inode;
1268 if (off >= uio->uio_offset) {
1269 error = vfs_read_dirent(ap, dp, off);
1270 if (error)
1271 break;
1272 }
1273 off += dp->d_reclen;
1274 }
1275 sx_xunlock(&dmp->dm_lock);
1276 uio->uio_offset = off;
1277
1278 /*
1279 * Restore ap->a_ncookies if it wasn't originally NULL in the first
1280 * place.
1281 */
1282 if (tmp_ncookies != NULL)
1283 ap->a_ncookies = tmp_ncookies;
1284
1285 return (error);
1286}
1287
1288static int
1289devfs_readlink(struct vop_readlink_args *ap)
1290{
1291 struct devfs_dirent *de;
1292
1293 de = ap->a_vp->v_data;
1294 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio));
1295}
1296
1297static int
1298devfs_reclaim(struct vop_reclaim_args *ap)
1299{
1300 struct vnode *vp = ap->a_vp;
1301 struct devfs_dirent *de;
1302 struct cdev *dev;
1303
1304 mtx_lock(&devfs_de_interlock);
1305 de = vp->v_data;
1306 if (de != NULL) {
1307 de->de_vnode = NULL;
1308 vp->v_data = NULL;
1309 }
1310 mtx_unlock(&devfs_de_interlock);
1311
1312 vnode_destroy_vobject(vp);
1313
1314 VI_LOCK(vp);
1315 dev_lock();
1316 dev = vp->v_rdev;
1317 vp->v_rdev = NULL;
1318
1319 if (dev == NULL) {
1320 dev_unlock();
1321 VI_UNLOCK(vp);
1322 return (0);
1323 }
1324
1325 dev->si_usecount -= vp->v_usecount;
1326 dev_unlock();
1327 VI_UNLOCK(vp);
1328 dev_rel(dev);
1329 return (0);
1330}
1331
1332static int
1333devfs_remove(struct vop_remove_args *ap)
1334{
1335 struct vnode *dvp = ap->a_dvp;
1336 struct vnode *vp = ap->a_vp;
1337 struct devfs_dirent *dd;
1338 struct devfs_dirent *de, *de_covered;
1339 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount);
1340
1341 ASSERT_VOP_ELOCKED(dvp, "devfs_remove");
1342 ASSERT_VOP_ELOCKED(vp, "devfs_remove");
1343
1344 sx_xlock(&dmp->dm_lock);
1345 dd = ap->a_dvp->v_data;
1346 de = vp->v_data;
1347 if (de->de_cdp == NULL) {
1348 TAILQ_REMOVE(&dd->de_dlist, de, de_list);
1349 if (de->de_dirent->d_type == DT_LNK) {
1350 de_covered = devfs_find(dd, de->de_dirent->d_name,
1351 de->de_dirent->d_namlen, 0);
1352 if (de_covered != NULL)
1353 de_covered->de_flags &= ~DE_COVERED;
1354 }
1355 /* We need to unlock dvp because devfs_delete() may lock it. */
1356 VOP_UNLOCK(vp, 0);
1357 if (dvp != vp)
1358 VOP_UNLOCK(dvp, 0);
1359 devfs_delete(dmp, de, 0);
1360 sx_xunlock(&dmp->dm_lock);
1361 if (dvp != vp)
1362 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1363 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1364 } else {
1365 de->de_flags |= DE_WHITEOUT;
1366 sx_xunlock(&dmp->dm_lock);
1367 }
1368 return (0);
1369}
1370
1371/*
1372 * Revoke is called on a tty when a terminal session ends. The vnode
1373 * is orphaned by setting v_op to deadfs so we need to let go of it
1374 * as well so that we create a new one next time around.
1375 *
1376 */
1377static int
1378devfs_revoke(struct vop_revoke_args *ap)
1379{
1380 struct vnode *vp = ap->a_vp, *vp2;
1381 struct cdev *dev;
1382 struct cdev_priv *cdp;
1383 struct devfs_dirent *de;
1384 int i;
1385
1386 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL"));
1387
1388 dev = vp->v_rdev;
1389 cdp = cdev2priv(dev);
1390
1391 dev_lock();
1392 cdp->cdp_inuse++;
1393 dev_unlock();
1394
1395 vhold(vp);
1396 vgone(vp);
1397 vdrop(vp);
1398
1399 VOP_UNLOCK(vp,0);
1400 loop:
1401 for (;;) {
1402 mtx_lock(&devfs_de_interlock);
1403 dev_lock();
1404 vp2 = NULL;
1405 for (i = 0; i <= cdp->cdp_maxdirent; i++) {
1406 de = cdp->cdp_dirents[i];
1407 if (de == NULL)
1408 continue;
1409
1410 vp2 = de->de_vnode;
1411 if (vp2 != NULL) {
1412 dev_unlock();
1413 VI_LOCK(vp2);
1414 mtx_unlock(&devfs_de_interlock);
1415 if (vget(vp2, LK_EXCLUSIVE | LK_INTERLOCK,
1416 curthread))
1417 goto loop;
1418 vhold(vp2);
1419 vgone(vp2);
1420 vdrop(vp2);
1421 vput(vp2);
1422 break;
1423 }
1424 }
1425 if (vp2 != NULL) {
1426 continue;
1427 }
1428 dev_unlock();
1429 mtx_unlock(&devfs_de_interlock);
1430 break;
1431 }
1432 dev_lock();
1433 cdp->cdp_inuse--;
1434 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) {
1435 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list);
1436 dev_unlock();
1437 dev_rel(&cdp->cdp_c);
1438 } else
1439 dev_unlock();
1440
1441 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1442 return (0);
1443}
1444
1445static int
1446devfs_rioctl(struct vop_ioctl_args *ap)
1447{
1448 struct vnode *vp;
1449 struct devfs_mount *dmp;
1450 int error;
1451
1452 vp = ap->a_vp;
1453 vn_lock(vp, LK_SHARED | LK_RETRY);
1454 if (vp->v_iflag & VI_DOOMED) {
1455 VOP_UNLOCK(vp, 0);
1456 return (EBADF);
1457 }
1458 dmp = VFSTODEVFS(vp->v_mount);
1459 sx_xlock(&dmp->dm_lock);
1460 VOP_UNLOCK(vp, 0);
1461 DEVFS_DMP_HOLD(dmp);
1462 devfs_populate(dmp);
1463 if (DEVFS_DMP_DROP(dmp)) {
1464 sx_xunlock(&dmp->dm_lock);
1465 devfs_unmount_final(dmp);
1466 return (ENOENT);
1467 }
1468 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td);
1469 sx_xunlock(&dmp->dm_lock);
1470 return (error);
1471}
1472
1473static int
1474devfs_rread(struct vop_read_args *ap)
1475{
1476
1477 if (ap->a_vp->v_type != VDIR)
1478 return (EINVAL);
1479 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL));
1480}
1481
1482static int
1483devfs_setattr(struct vop_setattr_args *ap)
1484{
1485 struct devfs_dirent *de;
1486 struct vattr *vap;
1487 struct vnode *vp;
1488 struct thread *td;
1489 int c, error;
1490 uid_t uid;
1491 gid_t gid;
1492
1493 vap = ap->a_vap;
1494 vp = ap->a_vp;
1495 td = curthread;
1496 if ((vap->va_type != VNON) ||
1497 (vap->va_nlink != VNOVAL) ||
1498 (vap->va_fsid != VNOVAL) ||
1499 (vap->va_fileid != VNOVAL) ||
1500 (vap->va_blocksize != VNOVAL) ||
1501 (vap->va_flags != VNOVAL && vap->va_flags != 0) ||
1502 (vap->va_rdev != VNOVAL) ||
1503 ((int)vap->va_bytes != VNOVAL) ||
1504 (vap->va_gen != VNOVAL)) {
1505 return (EINVAL);
1506 }
1507
1508 de = vp->v_data;
1509 if (vp->v_type == VDIR)
1510 de = de->de_dir;
1511
1512 error = c = 0;
1513 if (vap->va_uid == (uid_t)VNOVAL)
1514 uid = de->de_uid;
1515 else
1516 uid = vap->va_uid;
1517 if (vap->va_gid == (gid_t)VNOVAL)
1518 gid = de->de_gid;
1519 else
1520 gid = vap->va_gid;
1521 if (uid != de->de_uid || gid != de->de_gid) {
1522 if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid ||
1523 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) {
1524 error = priv_check(td, PRIV_VFS_CHOWN);
1525 if (error)
1526 return (error);
1527 }
1528 de->de_uid = uid;
1529 de->de_gid = gid;
1530 c = 1;
1531 }
1532
1533 if (vap->va_mode != (mode_t)VNOVAL) {
1534 if (ap->a_cred->cr_uid != de->de_uid) {
1535 error = priv_check(td, PRIV_VFS_ADMIN);
1536 if (error)
1537 return (error);
1538 }
1539 de->de_mode = vap->va_mode;
1540 c = 1;
1541 }
1542
1543 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
1544 error = vn_utimes_perm(vp, vap, ap->a_cred, td);
1545 if (error != 0)
1546 return (error);
1547 if (vap->va_atime.tv_sec != VNOVAL) {
1548 if (vp->v_type == VCHR)
1549 vp->v_rdev->si_atime = vap->va_atime;
1550 else
1551 de->de_atime = vap->va_atime;
1552 }
1553 if (vap->va_mtime.tv_sec != VNOVAL) {
1554 if (vp->v_type == VCHR)
1555 vp->v_rdev->si_mtime = vap->va_mtime;
1556 else
1557 de->de_mtime = vap->va_mtime;
1558 }
1559 c = 1;
1560 }
1561
1562 if (c) {
1563 if (vp->v_type == VCHR)
1564 vfs_timestamp(&vp->v_rdev->si_ctime);
1565 else
1566 vfs_timestamp(&de->de_mtime);
1567 }
1568 return (0);
1569}
1570
1571#ifdef MAC
1572static int
1573devfs_setlabel(struct vop_setlabel_args *ap)
1574{
1575 struct vnode *vp;
1576 struct devfs_dirent *de;
1577
1578 vp = ap->a_vp;
1579 de = vp->v_data;
1580
1581 mac_vnode_relabel(ap->a_cred, vp, ap->a_label);
1582 mac_devfs_update(vp->v_mount, de, vp);
1583
1584 return (0);
1585}
1586#endif
1587
1588static int
1589devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td)
1590{
1591
1592 return (vnops.fo_stat(fp, sb, cred, td));
1593}
1594
1595static int
1596devfs_symlink(struct vop_symlink_args *ap)
1597{
1598 int i, error;
1599 struct devfs_dirent *dd;
1600 struct devfs_dirent *de, *de_covered, *de_dotdot;
1601 struct devfs_mount *dmp;
1602
1603 error = priv_check(curthread, PRIV_DEVFS_SYMLINK);
1604 if (error)
1605 return(error);
1606 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
1607 if (devfs_populate_vp(ap->a_dvp) != 0)
1608 return (ENOENT);
1609
1610 dd = ap->a_dvp->v_data;
1611 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen);
1612 de->de_flags = DE_USER;
1613 de->de_uid = 0;
1614 de->de_gid = 0;
1615 de->de_mode = 0755;
1616 de->de_inode = alloc_unr(devfs_inos);
1617 de->de_dir = dd;
1618 de->de_dirent->d_type = DT_LNK;
1619 i = strlen(ap->a_target) + 1;
1620 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK);
1621 bcopy(ap->a_target, de->de_symlink, i);
1622#ifdef MAC
1623 mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de);
1624#endif
1625 de_covered = devfs_find(dd, de->de_dirent->d_name,
1626 de->de_dirent->d_namlen, 0);
1627 if (de_covered != NULL) {
1628 if ((de_covered->de_flags & DE_USER) != 0) {
1629 devfs_delete(dmp, de, DEVFS_DEL_NORECURSE);
1630 sx_xunlock(&dmp->dm_lock);
1631 return (EEXIST);
1632 }
1633 KASSERT((de_covered->de_flags & DE_COVERED) == 0,
1634 ("devfs_symlink: entry %p already covered", de_covered));
1635 de_covered->de_flags |= DE_COVERED;
1636 }
1637
1638 de_dotdot = TAILQ_FIRST(&dd->de_dlist); /* "." */
1639 de_dotdot = TAILQ_NEXT(de_dotdot, de_list); /* ".." */
1640 TAILQ_INSERT_AFTER(&dd->de_dlist, de_dotdot, de, de_list);
1641 devfs_dir_ref_de(dmp, dd);
1642 devfs_rules_apply(dmp, de);
1643
1644 return (devfs_allocv(de, ap->a_dvp->v_mount, LK_EXCLUSIVE, ap->a_vpp));
1645}
1646
1647static int
1648devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td)
1649{
1650
1651 return (vnops.fo_truncate(fp, length, cred, td));
1652}
1653
1654static int
1655devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred,
1656 int flags, struct thread *td)
1657{
1658 struct cdev *dev;
1659 int error, ioflag, ref;
1660 ssize_t resid;
1661 struct cdevsw *dsw;
1662 struct file *fpop;
1663
1664 if (uio->uio_resid > DEVFS_IOSIZE_MAX)
1665 return (EINVAL);
1666 fpop = td->td_fpop;
1667 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1668 if (error != 0) {
1669 error = vnops.fo_write(fp, uio, cred, flags, td);
1670 return (error);
1671 }
1672 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td));
1673 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC);
1674 if (ioflag & O_DIRECT)
1675 ioflag |= IO_DIRECT;
1676 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK);
1677
1678 resid = uio->uio_resid;
1679
1680 error = dsw->d_write(dev, uio, ioflag);
1681 if (uio->uio_resid != resid || (error == 0 && resid != 0)) {
| 1231 td->td_fpop = fpop;
1232 dev_relthread(dev, ref);
1233
1234 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF);
1235 return (error);
1236}
1237
1238static int
1239devfs_readdir(struct vop_readdir_args *ap)
1240{
1241 int error;
1242 struct uio *uio;
1243 struct dirent *dp;
1244 struct devfs_dirent *dd;
1245 struct devfs_dirent *de;
1246 struct devfs_mount *dmp;
1247 off_t off;
1248 int *tmp_ncookies = NULL;
1249
1250 if (ap->a_vp->v_type != VDIR)
1251 return (ENOTDIR);
1252
1253 uio = ap->a_uio;
1254 if (uio->uio_offset < 0)
1255 return (EINVAL);
1256
1257 /*
1258 * XXX: This is a temporary hack to get around this filesystem not
1259 * supporting cookies. We store the location of the ncookies pointer
1260 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent()
1261 * and set the number of cookies to 0. We then set the pointer to
1262 * NULL so that vfs_read_dirent doesn't try to call realloc() on
1263 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies
1264 * pointer to its original location before returning to the caller.
1265 */
1266 if (ap->a_ncookies != NULL) {
1267 tmp_ncookies = ap->a_ncookies;
1268 *ap->a_ncookies = 0;
1269 ap->a_ncookies = NULL;
1270 }
1271
1272 dmp = VFSTODEVFS(ap->a_vp->v_mount);
1273 if (devfs_populate_vp(ap->a_vp) != 0) {
1274 if (tmp_ncookies != NULL)
1275 ap->a_ncookies = tmp_ncookies;
1276 return (EIO);
1277 }
1278 error = 0;
1279 de = ap->a_vp->v_data;
1280 off = 0;
1281 TAILQ_FOREACH(dd, &de->de_dlist, de_list) {
1282 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__));
1283 if (dd->de_flags & (DE_COVERED | DE_WHITEOUT))
1284 continue;
1285 if (devfs_prison_check(dd, uio->uio_td))
1286 continue;
1287 if (dd->de_dirent->d_type == DT_DIR)
1288 de = dd->de_dir;
1289 else
1290 de = dd;
1291 dp = dd->de_dirent;
1292 if (dp->d_reclen > uio->uio_resid)
1293 break;
1294 dp->d_fileno = de->de_inode;
1295 if (off >= uio->uio_offset) {
1296 error = vfs_read_dirent(ap, dp, off);
1297 if (error)
1298 break;
1299 }
1300 off += dp->d_reclen;
1301 }
1302 sx_xunlock(&dmp->dm_lock);
1303 uio->uio_offset = off;
1304
1305 /*
1306 * Restore ap->a_ncookies if it wasn't originally NULL in the first
1307 * place.
1308 */
1309 if (tmp_ncookies != NULL)
1310 ap->a_ncookies = tmp_ncookies;
1311
1312 return (error);
1313}
1314
1315static int
1316devfs_readlink(struct vop_readlink_args *ap)
1317{
1318 struct devfs_dirent *de;
1319
1320 de = ap->a_vp->v_data;
1321 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio));
1322}
1323
1324static int
1325devfs_reclaim(struct vop_reclaim_args *ap)
1326{
1327 struct vnode *vp = ap->a_vp;
1328 struct devfs_dirent *de;
1329 struct cdev *dev;
1330
1331 mtx_lock(&devfs_de_interlock);
1332 de = vp->v_data;
1333 if (de != NULL) {
1334 de->de_vnode = NULL;
1335 vp->v_data = NULL;
1336 }
1337 mtx_unlock(&devfs_de_interlock);
1338
1339 vnode_destroy_vobject(vp);
1340
1341 VI_LOCK(vp);
1342 dev_lock();
1343 dev = vp->v_rdev;
1344 vp->v_rdev = NULL;
1345
1346 if (dev == NULL) {
1347 dev_unlock();
1348 VI_UNLOCK(vp);
1349 return (0);
1350 }
1351
1352 dev->si_usecount -= vp->v_usecount;
1353 dev_unlock();
1354 VI_UNLOCK(vp);
1355 dev_rel(dev);
1356 return (0);
1357}
1358
1359static int
1360devfs_remove(struct vop_remove_args *ap)
1361{
1362 struct vnode *dvp = ap->a_dvp;
1363 struct vnode *vp = ap->a_vp;
1364 struct devfs_dirent *dd;
1365 struct devfs_dirent *de, *de_covered;
1366 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount);
1367
1368 ASSERT_VOP_ELOCKED(dvp, "devfs_remove");
1369 ASSERT_VOP_ELOCKED(vp, "devfs_remove");
1370
1371 sx_xlock(&dmp->dm_lock);
1372 dd = ap->a_dvp->v_data;
1373 de = vp->v_data;
1374 if (de->de_cdp == NULL) {
1375 TAILQ_REMOVE(&dd->de_dlist, de, de_list);
1376 if (de->de_dirent->d_type == DT_LNK) {
1377 de_covered = devfs_find(dd, de->de_dirent->d_name,
1378 de->de_dirent->d_namlen, 0);
1379 if (de_covered != NULL)
1380 de_covered->de_flags &= ~DE_COVERED;
1381 }
1382 /* We need to unlock dvp because devfs_delete() may lock it. */
1383 VOP_UNLOCK(vp, 0);
1384 if (dvp != vp)
1385 VOP_UNLOCK(dvp, 0);
1386 devfs_delete(dmp, de, 0);
1387 sx_xunlock(&dmp->dm_lock);
1388 if (dvp != vp)
1389 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1390 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1391 } else {
1392 de->de_flags |= DE_WHITEOUT;
1393 sx_xunlock(&dmp->dm_lock);
1394 }
1395 return (0);
1396}
1397
1398/*
1399 * Revoke is called on a tty when a terminal session ends. The vnode
1400 * is orphaned by setting v_op to deadfs so we need to let go of it
1401 * as well so that we create a new one next time around.
1402 *
1403 */
1404static int
1405devfs_revoke(struct vop_revoke_args *ap)
1406{
1407 struct vnode *vp = ap->a_vp, *vp2;
1408 struct cdev *dev;
1409 struct cdev_priv *cdp;
1410 struct devfs_dirent *de;
1411 int i;
1412
1413 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL"));
1414
1415 dev = vp->v_rdev;
1416 cdp = cdev2priv(dev);
1417
1418 dev_lock();
1419 cdp->cdp_inuse++;
1420 dev_unlock();
1421
1422 vhold(vp);
1423 vgone(vp);
1424 vdrop(vp);
1425
1426 VOP_UNLOCK(vp,0);
1427 loop:
1428 for (;;) {
1429 mtx_lock(&devfs_de_interlock);
1430 dev_lock();
1431 vp2 = NULL;
1432 for (i = 0; i <= cdp->cdp_maxdirent; i++) {
1433 de = cdp->cdp_dirents[i];
1434 if (de == NULL)
1435 continue;
1436
1437 vp2 = de->de_vnode;
1438 if (vp2 != NULL) {
1439 dev_unlock();
1440 VI_LOCK(vp2);
1441 mtx_unlock(&devfs_de_interlock);
1442 if (vget(vp2, LK_EXCLUSIVE | LK_INTERLOCK,
1443 curthread))
1444 goto loop;
1445 vhold(vp2);
1446 vgone(vp2);
1447 vdrop(vp2);
1448 vput(vp2);
1449 break;
1450 }
1451 }
1452 if (vp2 != NULL) {
1453 continue;
1454 }
1455 dev_unlock();
1456 mtx_unlock(&devfs_de_interlock);
1457 break;
1458 }
1459 dev_lock();
1460 cdp->cdp_inuse--;
1461 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) {
1462 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list);
1463 dev_unlock();
1464 dev_rel(&cdp->cdp_c);
1465 } else
1466 dev_unlock();
1467
1468 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1469 return (0);
1470}
1471
1472static int
1473devfs_rioctl(struct vop_ioctl_args *ap)
1474{
1475 struct vnode *vp;
1476 struct devfs_mount *dmp;
1477 int error;
1478
1479 vp = ap->a_vp;
1480 vn_lock(vp, LK_SHARED | LK_RETRY);
1481 if (vp->v_iflag & VI_DOOMED) {
1482 VOP_UNLOCK(vp, 0);
1483 return (EBADF);
1484 }
1485 dmp = VFSTODEVFS(vp->v_mount);
1486 sx_xlock(&dmp->dm_lock);
1487 VOP_UNLOCK(vp, 0);
1488 DEVFS_DMP_HOLD(dmp);
1489 devfs_populate(dmp);
1490 if (DEVFS_DMP_DROP(dmp)) {
1491 sx_xunlock(&dmp->dm_lock);
1492 devfs_unmount_final(dmp);
1493 return (ENOENT);
1494 }
1495 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td);
1496 sx_xunlock(&dmp->dm_lock);
1497 return (error);
1498}
1499
1500static int
1501devfs_rread(struct vop_read_args *ap)
1502{
1503
1504 if (ap->a_vp->v_type != VDIR)
1505 return (EINVAL);
1506 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL));
1507}
1508
1509static int
1510devfs_setattr(struct vop_setattr_args *ap)
1511{
1512 struct devfs_dirent *de;
1513 struct vattr *vap;
1514 struct vnode *vp;
1515 struct thread *td;
1516 int c, error;
1517 uid_t uid;
1518 gid_t gid;
1519
1520 vap = ap->a_vap;
1521 vp = ap->a_vp;
1522 td = curthread;
1523 if ((vap->va_type != VNON) ||
1524 (vap->va_nlink != VNOVAL) ||
1525 (vap->va_fsid != VNOVAL) ||
1526 (vap->va_fileid != VNOVAL) ||
1527 (vap->va_blocksize != VNOVAL) ||
1528 (vap->va_flags != VNOVAL && vap->va_flags != 0) ||
1529 (vap->va_rdev != VNOVAL) ||
1530 ((int)vap->va_bytes != VNOVAL) ||
1531 (vap->va_gen != VNOVAL)) {
1532 return (EINVAL);
1533 }
1534
1535 de = vp->v_data;
1536 if (vp->v_type == VDIR)
1537 de = de->de_dir;
1538
1539 error = c = 0;
1540 if (vap->va_uid == (uid_t)VNOVAL)
1541 uid = de->de_uid;
1542 else
1543 uid = vap->va_uid;
1544 if (vap->va_gid == (gid_t)VNOVAL)
1545 gid = de->de_gid;
1546 else
1547 gid = vap->va_gid;
1548 if (uid != de->de_uid || gid != de->de_gid) {
1549 if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid ||
1550 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) {
1551 error = priv_check(td, PRIV_VFS_CHOWN);
1552 if (error)
1553 return (error);
1554 }
1555 de->de_uid = uid;
1556 de->de_gid = gid;
1557 c = 1;
1558 }
1559
1560 if (vap->va_mode != (mode_t)VNOVAL) {
1561 if (ap->a_cred->cr_uid != de->de_uid) {
1562 error = priv_check(td, PRIV_VFS_ADMIN);
1563 if (error)
1564 return (error);
1565 }
1566 de->de_mode = vap->va_mode;
1567 c = 1;
1568 }
1569
1570 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
1571 error = vn_utimes_perm(vp, vap, ap->a_cred, td);
1572 if (error != 0)
1573 return (error);
1574 if (vap->va_atime.tv_sec != VNOVAL) {
1575 if (vp->v_type == VCHR)
1576 vp->v_rdev->si_atime = vap->va_atime;
1577 else
1578 de->de_atime = vap->va_atime;
1579 }
1580 if (vap->va_mtime.tv_sec != VNOVAL) {
1581 if (vp->v_type == VCHR)
1582 vp->v_rdev->si_mtime = vap->va_mtime;
1583 else
1584 de->de_mtime = vap->va_mtime;
1585 }
1586 c = 1;
1587 }
1588
1589 if (c) {
1590 if (vp->v_type == VCHR)
1591 vfs_timestamp(&vp->v_rdev->si_ctime);
1592 else
1593 vfs_timestamp(&de->de_mtime);
1594 }
1595 return (0);
1596}
1597
1598#ifdef MAC
1599static int
1600devfs_setlabel(struct vop_setlabel_args *ap)
1601{
1602 struct vnode *vp;
1603 struct devfs_dirent *de;
1604
1605 vp = ap->a_vp;
1606 de = vp->v_data;
1607
1608 mac_vnode_relabel(ap->a_cred, vp, ap->a_label);
1609 mac_devfs_update(vp->v_mount, de, vp);
1610
1611 return (0);
1612}
1613#endif
1614
1615static int
1616devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td)
1617{
1618
1619 return (vnops.fo_stat(fp, sb, cred, td));
1620}
1621
1622static int
1623devfs_symlink(struct vop_symlink_args *ap)
1624{
1625 int i, error;
1626 struct devfs_dirent *dd;
1627 struct devfs_dirent *de, *de_covered, *de_dotdot;
1628 struct devfs_mount *dmp;
1629
1630 error = priv_check(curthread, PRIV_DEVFS_SYMLINK);
1631 if (error)
1632 return(error);
1633 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
1634 if (devfs_populate_vp(ap->a_dvp) != 0)
1635 return (ENOENT);
1636
1637 dd = ap->a_dvp->v_data;
1638 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen);
1639 de->de_flags = DE_USER;
1640 de->de_uid = 0;
1641 de->de_gid = 0;
1642 de->de_mode = 0755;
1643 de->de_inode = alloc_unr(devfs_inos);
1644 de->de_dir = dd;
1645 de->de_dirent->d_type = DT_LNK;
1646 i = strlen(ap->a_target) + 1;
1647 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK);
1648 bcopy(ap->a_target, de->de_symlink, i);
1649#ifdef MAC
1650 mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de);
1651#endif
1652 de_covered = devfs_find(dd, de->de_dirent->d_name,
1653 de->de_dirent->d_namlen, 0);
1654 if (de_covered != NULL) {
1655 if ((de_covered->de_flags & DE_USER) != 0) {
1656 devfs_delete(dmp, de, DEVFS_DEL_NORECURSE);
1657 sx_xunlock(&dmp->dm_lock);
1658 return (EEXIST);
1659 }
1660 KASSERT((de_covered->de_flags & DE_COVERED) == 0,
1661 ("devfs_symlink: entry %p already covered", de_covered));
1662 de_covered->de_flags |= DE_COVERED;
1663 }
1664
1665 de_dotdot = TAILQ_FIRST(&dd->de_dlist); /* "." */
1666 de_dotdot = TAILQ_NEXT(de_dotdot, de_list); /* ".." */
1667 TAILQ_INSERT_AFTER(&dd->de_dlist, de_dotdot, de, de_list);
1668 devfs_dir_ref_de(dmp, dd);
1669 devfs_rules_apply(dmp, de);
1670
1671 return (devfs_allocv(de, ap->a_dvp->v_mount, LK_EXCLUSIVE, ap->a_vpp));
1672}
1673
1674static int
1675devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td)
1676{
1677
1678 return (vnops.fo_truncate(fp, length, cred, td));
1679}
1680
1681static int
1682devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred,
1683 int flags, struct thread *td)
1684{
1685 struct cdev *dev;
1686 int error, ioflag, ref;
1687 ssize_t resid;
1688 struct cdevsw *dsw;
1689 struct file *fpop;
1690
1691 if (uio->uio_resid > DEVFS_IOSIZE_MAX)
1692 return (EINVAL);
1693 fpop = td->td_fpop;
1694 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1695 if (error != 0) {
1696 error = vnops.fo_write(fp, uio, cred, flags, td);
1697 return (error);
1698 }
1699 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td));
1700 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC);
1701 if (ioflag & O_DIRECT)
1702 ioflag |= IO_DIRECT;
1703 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK);
1704
1705 resid = uio->uio_resid;
1706
1707 error = dsw->d_write(dev, uio, ioflag);
1708 if (uio->uio_resid != resid || (error == 0 && resid != 0)) {
|
1682 vfs_timestamp(&dev->si_ctime);
| 1709 devfs_timestamp(&dev->si_ctime);
|
1683 dev->si_mtime = dev->si_ctime;
1684 }
1685 td->td_fpop = fpop;
1686 dev_relthread(dev, ref);
1687
1688 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF);
1689 return (error);
1690}
1691
1692dev_t
1693dev2udev(struct cdev *x)
1694{
1695 if (x == NULL)
1696 return (NODEV);
1697 return (cdev2priv(x)->cdp_inode);
1698}
1699
1700static struct fileops devfs_ops_f = {
1701 .fo_read = devfs_read_f,
1702 .fo_write = devfs_write_f,
1703 .fo_truncate = devfs_truncate_f,
1704 .fo_ioctl = devfs_ioctl_f,
1705 .fo_poll = devfs_poll_f,
1706 .fo_kqfilter = devfs_kqfilter_f,
1707 .fo_stat = devfs_stat_f,
1708 .fo_close = devfs_close_f,
1709 .fo_chmod = vn_chmod,
1710 .fo_chown = vn_chown,
1711 .fo_sendfile = vn_sendfile,
1712 .fo_seek = vn_seek,
1713 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE
1714};
1715
1716static struct vop_vector devfs_vnodeops = {
1717 .vop_default = &default_vnodeops,
1718
1719 .vop_access = devfs_access,
1720 .vop_getattr = devfs_getattr,
1721 .vop_ioctl = devfs_rioctl,
1722 .vop_lookup = devfs_lookup,
1723 .vop_mknod = devfs_mknod,
1724 .vop_pathconf = devfs_pathconf,
1725 .vop_read = devfs_rread,
1726 .vop_readdir = devfs_readdir,
1727 .vop_readlink = devfs_readlink,
1728 .vop_reclaim = devfs_reclaim,
1729 .vop_remove = devfs_remove,
1730 .vop_revoke = devfs_revoke,
1731 .vop_setattr = devfs_setattr,
1732#ifdef MAC
1733 .vop_setlabel = devfs_setlabel,
1734#endif
1735 .vop_symlink = devfs_symlink,
1736 .vop_vptocnp = devfs_vptocnp,
1737};
1738
1739struct vop_vector devfs_specops = {
1740 .vop_default = &default_vnodeops,
1741
1742 .vop_access = devfs_access,
1743 .vop_bmap = VOP_PANIC,
1744 .vop_close = devfs_close,
1745 .vop_create = VOP_PANIC,
1746 .vop_fsync = devfs_fsync,
1747 .vop_getattr = devfs_getattr,
1748 .vop_link = VOP_PANIC,
1749 .vop_mkdir = VOP_PANIC,
1750 .vop_mknod = VOP_PANIC,
1751 .vop_open = devfs_open,
1752 .vop_pathconf = devfs_pathconf,
1753 .vop_poll = dead_poll,
1754 .vop_print = devfs_print,
1755 .vop_read = dead_read,
1756 .vop_readdir = VOP_PANIC,
1757 .vop_readlink = VOP_PANIC,
1758 .vop_reallocblks = VOP_PANIC,
1759 .vop_reclaim = devfs_reclaim,
1760 .vop_remove = devfs_remove,
1761 .vop_rename = VOP_PANIC,
1762 .vop_revoke = devfs_revoke,
1763 .vop_rmdir = VOP_PANIC,
1764 .vop_setattr = devfs_setattr,
1765#ifdef MAC
1766 .vop_setlabel = devfs_setlabel,
1767#endif
1768 .vop_strategy = VOP_PANIC,
1769 .vop_symlink = VOP_PANIC,
1770 .vop_vptocnp = devfs_vptocnp,
1771 .vop_write = dead_write,
1772};
1773
1774/*
1775 * Our calling convention to the device drivers used to be that we passed
1776 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_
1777 * flags instead since that's what open(), close() and ioctl() takes and
1778 * we don't really want vnode.h in device drivers.
1779 * We solved the source compatibility by redefining some vnode flags to
1780 * be the same as the fcntl ones and by sending down the bitwise OR of
1781 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody
1782 * pulls the rug out under this.
1783 */
1784CTASSERT(O_NONBLOCK == IO_NDELAY);
1785CTASSERT(O_FSYNC == IO_SYNC);
| 1710 dev->si_mtime = dev->si_ctime;
1711 }
1712 td->td_fpop = fpop;
1713 dev_relthread(dev, ref);
1714
1715 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF);
1716 return (error);
1717}
1718
1719dev_t
1720dev2udev(struct cdev *x)
1721{
1722 if (x == NULL)
1723 return (NODEV);
1724 return (cdev2priv(x)->cdp_inode);
1725}
1726
1727static struct fileops devfs_ops_f = {
1728 .fo_read = devfs_read_f,
1729 .fo_write = devfs_write_f,
1730 .fo_truncate = devfs_truncate_f,
1731 .fo_ioctl = devfs_ioctl_f,
1732 .fo_poll = devfs_poll_f,
1733 .fo_kqfilter = devfs_kqfilter_f,
1734 .fo_stat = devfs_stat_f,
1735 .fo_close = devfs_close_f,
1736 .fo_chmod = vn_chmod,
1737 .fo_chown = vn_chown,
1738 .fo_sendfile = vn_sendfile,
1739 .fo_seek = vn_seek,
1740 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE
1741};
1742
1743static struct vop_vector devfs_vnodeops = {
1744 .vop_default = &default_vnodeops,
1745
1746 .vop_access = devfs_access,
1747 .vop_getattr = devfs_getattr,
1748 .vop_ioctl = devfs_rioctl,
1749 .vop_lookup = devfs_lookup,
1750 .vop_mknod = devfs_mknod,
1751 .vop_pathconf = devfs_pathconf,
1752 .vop_read = devfs_rread,
1753 .vop_readdir = devfs_readdir,
1754 .vop_readlink = devfs_readlink,
1755 .vop_reclaim = devfs_reclaim,
1756 .vop_remove = devfs_remove,
1757 .vop_revoke = devfs_revoke,
1758 .vop_setattr = devfs_setattr,
1759#ifdef MAC
1760 .vop_setlabel = devfs_setlabel,
1761#endif
1762 .vop_symlink = devfs_symlink,
1763 .vop_vptocnp = devfs_vptocnp,
1764};
1765
1766struct vop_vector devfs_specops = {
1767 .vop_default = &default_vnodeops,
1768
1769 .vop_access = devfs_access,
1770 .vop_bmap = VOP_PANIC,
1771 .vop_close = devfs_close,
1772 .vop_create = VOP_PANIC,
1773 .vop_fsync = devfs_fsync,
1774 .vop_getattr = devfs_getattr,
1775 .vop_link = VOP_PANIC,
1776 .vop_mkdir = VOP_PANIC,
1777 .vop_mknod = VOP_PANIC,
1778 .vop_open = devfs_open,
1779 .vop_pathconf = devfs_pathconf,
1780 .vop_poll = dead_poll,
1781 .vop_print = devfs_print,
1782 .vop_read = dead_read,
1783 .vop_readdir = VOP_PANIC,
1784 .vop_readlink = VOP_PANIC,
1785 .vop_reallocblks = VOP_PANIC,
1786 .vop_reclaim = devfs_reclaim,
1787 .vop_remove = devfs_remove,
1788 .vop_rename = VOP_PANIC,
1789 .vop_revoke = devfs_revoke,
1790 .vop_rmdir = VOP_PANIC,
1791 .vop_setattr = devfs_setattr,
1792#ifdef MAC
1793 .vop_setlabel = devfs_setlabel,
1794#endif
1795 .vop_strategy = VOP_PANIC,
1796 .vop_symlink = VOP_PANIC,
1797 .vop_vptocnp = devfs_vptocnp,
1798 .vop_write = dead_write,
1799};
1800
1801/*
1802 * Our calling convention to the device drivers used to be that we passed
1803 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_
1804 * flags instead since that's what open(), close() and ioctl() takes and
1805 * we don't really want vnode.h in device drivers.
1806 * We solved the source compatibility by redefining some vnode flags to
1807 * be the same as the fcntl ones and by sending down the bitwise OR of
1808 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody
1809 * pulls the rug out under this.
1810 */
1811CTASSERT(O_NONBLOCK == IO_NDELAY);
1812CTASSERT(O_FSYNC == IO_SYNC);
|