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 * $FreeBSD$
35 */
36
37 /*
38 * TODO:
39 * remove empty directories
40 * mkdir: want it ?
41 */
42
43 #include <opt_devfs.h>
44 #include <opt_mac.h>
45
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/conf.h>
49 #include <sys/dirent.h>
50 #include <sys/fcntl.h>
51 #include <sys/file.h>
52 #include <sys/filedesc.h>
53 #include <sys/filio.h>
54 #include <sys/kernel.h>
55 #include <sys/lock.h>
56 #include <sys/mac.h>
57 #include <sys/malloc.h>
58 #include <sys/mount.h>
59 #include <sys/namei.h>
60 #include <sys/proc.h>
61 #include <sys/stat.h>
62 #include <sys/sx.h>
63 #include <sys/time.h>
64 #include <sys/ttycom.h>
65 #include <sys/unistd.h>
66 #include <sys/vnode.h>
67
68 static struct vop_vector devfs_vnodeops;
69 static struct vop_vector devfs_specops;
70 static struct fileops devfs_ops_f;
71
72 #include <fs/devfs/devfs.h>
73 #include <fs/devfs/devfs_int.h>
74
75 struct mtx devfs_de_interlock;
76 MTX_SYSINIT(devfs_de_interlock, &devfs_de_interlock, "devfs interlock", MTX_DEF);
77
78 static int
79 devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp)
80 {
81
82 *dswp = devvn_refthread(fp->f_vnode, devp);
83 if (*devp != fp->f_data) {
84 if (*dswp != NULL)
85 dev_relthread(*devp);
86 return (ENXIO);
87 }
88 KASSERT((*devp)->si_refcount > 0,
89 ("devfs: un-referenced struct cdev *(%s)", devtoname(*devp)));
90 if (*dswp == NULL)
91 return (ENXIO);
92 return (0);
93 }
94
95 /*
96 * Construct the fully qualified path name relative to the mountpoint
97 */
98 static char *
99 devfs_fqpn(char *buf, struct vnode *dvp, struct componentname *cnp)
100 {
101 int i;
102 struct devfs_dirent *de, *dd;
103 struct devfs_mount *dmp;
104
105 dmp = VFSTODEVFS(dvp->v_mount);
106 dd = dvp->v_data;
107 i = SPECNAMELEN;
108 buf[i] = '\0';
109 i -= cnp->cn_namelen;
110 if (i < 0)
111 return (NULL);
112 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen);
113 de = dd;
114 while (de != dmp->dm_rootdir) {
115 i--;
116 if (i < 0)
117 return (NULL);
118 buf[i] = '/';
119 i -= de->de_dirent->d_namlen;
120 if (i < 0)
121 return (NULL);
122 bcopy(de->de_dirent->d_name, buf + i,
123 de->de_dirent->d_namlen);
124 de = TAILQ_FIRST(&de->de_dlist); /* "." */
125 de = TAILQ_NEXT(de, de_list); /* ".." */
126 de = de->de_dir;
127 }
128 return (buf + i);
129 }
130
131 static int
132 devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp,
133 struct devfs_dirent *de)
134 {
135 int not_found;
136
137 not_found = 0;
138 if (de->de_flags & DE_DOOMED)
139 not_found = 1;
140 if (DEVFS_DE_DROP(de)) {
141 KASSERT(not_found == 1, ("DEVFS de dropped but not doomed"));
142 devfs_dirent_free(de);
143 }
144 if (DEVFS_DMP_DROP(dmp)) {
145 KASSERT(not_found == 1,
146 ("DEVFS mount struct freed before dirent"));
147 not_found = 2;
148 sx_xunlock(&dmp->dm_lock);
149 devfs_unmount_final(dmp);
150 }
151 if (not_found == 1 || (drop_dm_lock && not_found != 2))
152 sx_unlock(&dmp->dm_lock);
153 return (not_found);
154 }
155
156 /*
157 * devfs_allocv shall be entered with dmp->dm_lock held, and it drops
158 * it on return.
159 */
160 int
161 devfs_allocv(struct devfs_dirent *de, struct mount *mp, struct vnode **vpp, struct thread *td)
162 {
163 int error;
164 struct vnode *vp;
165 struct cdev *dev;
166 struct devfs_mount *dmp;
167
168 KASSERT(td == curthread, ("devfs_allocv: td != curthread"));
169 dmp = VFSTODEVFS(mp);
170 if (de->de_flags & DE_DOOMED) {
171 sx_xunlock(&dmp->dm_lock);
172 return (ENOENT);
173 }
174 loop:
175 DEVFS_DE_HOLD(de);
176 DEVFS_DMP_HOLD(dmp);
177 mtx_lock(&devfs_de_interlock);
178 vp = de->de_vnode;
179 if (vp != NULL) {
180 VI_LOCK(vp);
181 mtx_unlock(&devfs_de_interlock);
182 sx_xunlock(&dmp->dm_lock);
183 error = vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td);
184 sx_xlock(&dmp->dm_lock);
185 if (devfs_allocv_drop_refs(0, dmp, de)) {
186 if (error == 0)
187 vput(vp);
188 return (ENOENT);
189 }
190 else if (error)
191 goto loop;
192 sx_xunlock(&dmp->dm_lock);
193 *vpp = vp;
194 return (0);
195 }
196 mtx_unlock(&devfs_de_interlock);
197 if (de->de_dirent->d_type == DT_CHR) {
198 if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) {
199 devfs_allocv_drop_refs(1, dmp, de);
200 return (ENOENT);
201 }
202 dev = &de->de_cdp->cdp_c;
203 } else {
204 dev = NULL;
205 }
206 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp);
207 if (error != 0) {
208 devfs_allocv_drop_refs(1, dmp, de);
209 printf("devfs_allocv: failed to allocate new vnode\n");
210 return (error);
211 }
212
213 if (de->de_dirent->d_type == DT_CHR) {
214 vp->v_type = VCHR;
215 VI_LOCK(vp);
216 dev_lock();
217 dev_refl(dev);
218 /* XXX: v_rdev should be protect by vnode lock */
219 vp->v_rdev = dev;
220 KASSERT(vp->v_usecount == 1,
221 ("%s %d (%d)\n", __func__, __LINE__, vp->v_usecount));
222 dev->si_usecount += vp->v_usecount;
223 dev_unlock();
224 VI_UNLOCK(vp);
225 vp->v_op = &devfs_specops;
226 } else if (de->de_dirent->d_type == DT_DIR) {
227 vp->v_type = VDIR;
228 } else if (de->de_dirent->d_type == DT_LNK) {
229 vp->v_type = VLNK;
230 } else {
231 vp->v_type = VBAD;
232 }
233 mtx_lock(&devfs_de_interlock);
234 vp->v_data = de;
235 de->de_vnode = vp;
236 mtx_unlock(&devfs_de_interlock);
237 sx_xunlock(&dmp->dm_lock);
238 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
239 sx_xlock(&dmp->dm_lock);
240 if (devfs_allocv_drop_refs(0, dmp, de)) {
241 vput(vp);
242 return (ENOENT);
243 }
244 #ifdef MAC
245 mac_associate_vnode_devfs(mp, de, vp);
246 #endif
247 sx_xunlock(&dmp->dm_lock);
248 *vpp = vp;
249 return (0);
250 }
251
252 static int
253 devfs_access(struct vop_access_args *ap)
254 {
255 struct vnode *vp = ap->a_vp;
256 struct devfs_dirent *de;
257 int error;
258
259 de = vp->v_data;
260 if (vp->v_type == VDIR)
261 de = de->de_dir;
262
263 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid,
264 ap->a_mode, ap->a_cred, NULL);
265 if (!error)
266 return (error);
267 if (error != EACCES)
268 return (error);
269 /* We do, however, allow access to the controlling terminal */
270 if (!(ap->a_td->td_proc->p_flag & P_CONTROLT))
271 return (error);
272 if (ap->a_td->td_proc->p_session->s_ttyvp == de->de_vnode)
273 return (0);
274 return (error);
275 }
276
277 /* ARGSUSED */
278 static int
279 devfs_advlock(struct vop_advlock_args *ap)
280 {
281
282 return (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL);
283 }
284
285 /* ARGSUSED */
286 static int
287 devfs_close(struct vop_close_args *ap)
288 {
289 struct vnode *vp = ap->a_vp, *oldvp;
290 struct thread *td = ap->a_td;
291 struct cdev *dev = vp->v_rdev;
292 struct cdevsw *dsw;
293 int vp_locked, error;
294
295 /*
296 * Hack: a tty device that is a controlling terminal
297 * has a reference from the session structure.
298 * We cannot easily tell that a character device is
299 * a controlling terminal, unless it is the closing
300 * process' controlling terminal. In that case,
301 * if the reference count is 2 (this last descriptor
302 * plus the session), release the reference from the session.
303 */
304
305 /*
306 * This needs to be rewritten to take the vp interlock into
307 * consideration.
308 */
309
310 oldvp = NULL;
311 sx_xlock(&proctree_lock);
312 if (td && vp == td->td_proc->p_session->s_ttyvp) {
313 SESS_LOCK(td->td_proc->p_session);
314 VI_LOCK(vp);
315 if (count_dev(dev) == 2 && (vp->v_iflag & VI_DOOMED) == 0) {
316 td->td_proc->p_session->s_ttyvp = NULL;
317 oldvp = vp;
318 }
319 VI_UNLOCK(vp);
320 SESS_UNLOCK(td->td_proc->p_session);
321 }
322 sx_xunlock(&proctree_lock);
323 if (oldvp != NULL)
324 vrele(oldvp);
325 /*
326 * We do not want to really close the device if it
327 * is still in use unless we are trying to close it
328 * forcibly. Since every use (buffer, vnode, swap, cmap)
329 * holds a reference to the vnode, and because we mark
330 * any other vnodes that alias this device, when the
331 * sum of the reference counts on all the aliased
332 * vnodes descends to one, we are on last close.
333 */
334 dsw = dev_refthread(dev);
335 if (dsw == NULL)
336 return (ENXIO);
337 VI_LOCK(vp);
338 if (vp->v_iflag & VI_DOOMED) {
339 /* Forced close. */
340 } else if (dsw->d_flags & D_TRACKCLOSE) {
341 /* Keep device updated on status. */
342 } else if (count_dev(dev) > 1) {
343 VI_UNLOCK(vp);
344 dev_relthread(dev);
345 return (0);
346 }
347 vholdl(vp);
348 VI_UNLOCK(vp);
349 vp_locked = VOP_ISLOCKED(vp, td);
350 VOP_UNLOCK(vp, 0, td);
351 KASSERT(dev->si_refcount > 0,
352 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev)));
353 if (!(dsw->d_flags & D_NEEDGIANT)) {
354 DROP_GIANT();
355 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td);
356 PICKUP_GIANT();
357 } else {
358 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td);
359 }
360 dev_relthread(dev);
361 vn_lock(vp, vp_locked | LK_RETRY, td);
362 vdrop(vp);
363 return (error);
364 }
365
366 static int
367 devfs_close_f(struct file *fp, struct thread *td)
368 {
369
370 return (vnops.fo_close(fp, td));
371 }
372
373 /* ARGSUSED */
374 static int
375 devfs_fsync(struct vop_fsync_args *ap)
376 {
377 if (!vn_isdisk(ap->a_vp, NULL))
378 return (0);
379
380 return (vop_stdfsync(ap));
381 }
382
383 static int
384 devfs_getattr(struct vop_getattr_args *ap)
385 {
386 struct vnode *vp = ap->a_vp;
387 struct vattr *vap = ap->a_vap;
388 int error = 0;
389 struct devfs_dirent *de;
390 struct cdev *dev;
391
392 de = vp->v_data;
393 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp));
394 if (vp->v_type == VDIR) {
395 de = de->de_dir;
396 KASSERT(de != NULL,
397 ("Null dir dirent in devfs_getattr vp=%p", vp));
398 }
399 bzero((caddr_t) vap, sizeof(*vap));
400 vattr_null(vap);
401 vap->va_uid = de->de_uid;
402 vap->va_gid = de->de_gid;
403 vap->va_mode = de->de_mode;
404 if (vp->v_type == VLNK)
405 vap->va_size = strlen(de->de_symlink);
406 else if (vp->v_type == VDIR)
407 vap->va_size = vap->va_bytes = DEV_BSIZE;
408 else
409 vap->va_size = 0;
410 if (vp->v_type != VDIR)
411 vap->va_bytes = 0;
412 vap->va_blocksize = DEV_BSIZE;
413 vap->va_type = vp->v_type;
414
415 #define fix(aa) \
416 do { \
417 if ((aa).tv_sec == 0) { \
418 (aa).tv_sec = boottime.tv_sec; \
419 (aa).tv_nsec = boottime.tv_usec * 1000; \
420 } \
421 } while (0)
422
423 if (vp->v_type != VCHR) {
424 fix(de->de_atime);
425 vap->va_atime = de->de_atime;
426 fix(de->de_mtime);
427 vap->va_mtime = de->de_mtime;
428 fix(de->de_ctime);
429 vap->va_ctime = de->de_ctime;
430 } else {
431 dev = vp->v_rdev;
432 fix(dev->si_atime);
433 vap->va_atime = dev->si_atime;
434 fix(dev->si_mtime);
435 vap->va_mtime = dev->si_mtime;
436 fix(dev->si_ctime);
437 vap->va_ctime = dev->si_ctime;
438
439 vap->va_rdev = dev->si_priv->cdp_inode;
440 }
441 vap->va_gen = 0;
442 vap->va_flags = 0;
443 vap->va_nlink = de->de_links;
444 vap->va_fileid = de->de_inode;
445
446 return (error);
447 }
448
449 /* ARGSUSED */
450 static int
451 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td)
452 {
453 struct cdev *dev;
454 struct cdevsw *dsw;
455 struct vnode *vp;
456 struct vnode *vpold;
457 int error, i;
458 const char *p;
459 struct fiodgname_arg *fgn;
460
461 error = devfs_fp_check(fp, &dev, &dsw);
462 if (error)
463 return (error);
464
465 if (com == FIODTYPE) {
466 *(int *)data = dsw->d_flags & D_TYPEMASK;
467 dev_relthread(dev);
468 return (0);
469 } else if (com == FIODGNAME) {
470 fgn = data;
471 p = devtoname(dev);
472 i = strlen(p) + 1;
473 if (i > fgn->len)
474 error = EINVAL;
475 else
476 error = copyout(p, fgn->buf, i);
477 dev_relthread(dev);
478 return (error);
479 }
480 error = dsw->d_ioctl(dev, com, data, fp->f_flag, td);
481 dev_relthread(dev);
482 if (error == ENOIOCTL)
483 error = ENOTTY;
484 if (error == 0 && com == TIOCSCTTY) {
485 vp = fp->f_vnode;
486
487 /* Do nothing if reassigning same control tty */
488 sx_slock(&proctree_lock);
489 if (td->td_proc->p_session->s_ttyvp == vp) {
490 sx_sunlock(&proctree_lock);
491 return (0);
492 }
493
494 mtx_lock(&Giant);
495
496 vpold = td->td_proc->p_session->s_ttyvp;
497 VREF(vp);
498 SESS_LOCK(td->td_proc->p_session);
499 td->td_proc->p_session->s_ttyvp = vp;
500 SESS_UNLOCK(td->td_proc->p_session);
501
502 sx_sunlock(&proctree_lock);
503
504 /* Get rid of reference to old control tty */
505 if (vpold)
506 vrele(vpold);
507 mtx_unlock(&Giant);
508 }
509 return (error);
510 }
511
512 /* ARGSUSED */
513 static int
514 devfs_kqfilter_f(struct file *fp, struct knote *kn)
515 {
516 struct cdev *dev;
517 struct cdevsw *dsw;
518 int error;
519
520 error = devfs_fp_check(fp, &dev, &dsw);
521 if (error)
522 return (error);
523 error = dsw->d_kqfilter(dev, kn);
524 dev_relthread(dev);
525 return (error);
526 }
527
528 static int
529 devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock)
530 {
531 struct componentname *cnp;
532 struct vnode *dvp, **vpp;
533 struct thread *td;
534 struct devfs_dirent *de, *dd;
535 struct devfs_dirent **dde;
536 struct devfs_mount *dmp;
537 struct cdev *cdev;
538 int error, flags, nameiop;
539 char specname[SPECNAMELEN + 1], *pname;
540
541 cnp = ap->a_cnp;
542 vpp = ap->a_vpp;
543 dvp = ap->a_dvp;
544 pname = cnp->cn_nameptr;
545 td = cnp->cn_thread;
546 flags = cnp->cn_flags;
547 nameiop = cnp->cn_nameiop;
548 dmp = VFSTODEVFS(dvp->v_mount);
549 dd = dvp->v_data;
550 *vpp = NULLVP;
551
552 if ((flags & ISLASTCN) && nameiop == RENAME)
553 return (EOPNOTSUPP);
554
555 if (dvp->v_type != VDIR)
556 return (ENOTDIR);
557
558 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT))
559 return (EIO);
560
561 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td);
562 if (error)
563 return (error);
564
565 if (cnp->cn_namelen == 1 && *pname == '.') {
566 if ((flags & ISLASTCN) && nameiop != LOOKUP)
567 return (EINVAL);
568 *vpp = dvp;
569 VREF(dvp);
570 return (0);
571 }
572
573 if (flags & ISDOTDOT) {
574 if ((flags & ISLASTCN) && nameiop != LOOKUP)
575 return (EINVAL);
576 VOP_UNLOCK(dvp, 0, td);
577 de = TAILQ_FIRST(&dd->de_dlist); /* "." */
578 de = TAILQ_NEXT(de, de_list); /* ".." */
579 de = de->de_dir;
580 error = devfs_allocv(de, dvp->v_mount, vpp, td);
581 *dm_unlock = 0;
582 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
583 return (error);
584 }
585
586 DEVFS_DMP_HOLD(dmp);
587 devfs_populate(dmp);
588 if (DEVFS_DMP_DROP(dmp)) {
589 *dm_unlock = 0;
590 sx_xunlock(&dmp->dm_lock);
591 devfs_unmount_final(dmp);
592 return (ENOENT);
593 }
594 dd = dvp->v_data;
595 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen);
596 while (de == NULL) { /* While(...) so we can use break */
597
598 if (nameiop == DELETE)
599 return (ENOENT);
600
601 /*
602 * OK, we didn't have an entry for the name we were asked for
603 * so we try to see if anybody can create it on demand.
604 */
605 pname = devfs_fqpn(specname, dvp, cnp);
606 if (pname == NULL)
607 break;
608
609 cdev = NULL;
610 EVENTHANDLER_INVOKE(dev_clone,
611 td->td_ucred, pname, strlen(pname), &cdev);
612 if (cdev == NULL)
613 break;
614
615 DEVFS_DMP_HOLD(dmp);
616 devfs_populate(dmp);
617 if (DEVFS_DMP_DROP(dmp)) {
618 *dm_unlock = 0;
619 sx_xunlock(&dmp->dm_lock);
620 devfs_unmount_final(dmp);
621 return (ENOENT);
622 }
623
624 dev_lock();
625 dde = &cdev->si_priv->cdp_dirents[dmp->dm_idx];
626 if (dde != NULL && *dde != NULL)
627 de = *dde;
628 dev_unlock();
629 dev_rel(cdev);
630 break;
631 }
632
633 if (de == NULL || de->de_flags & DE_WHITEOUT) {
634 if ((nameiop == CREATE || nameiop == RENAME) &&
635 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) {
636 cnp->cn_flags |= SAVENAME;
637 return (EJUSTRETURN);
638 }
639 return (ENOENT);
640 }
641
642 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) {
643 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
644 if (error)
645 return (error);
646 if (*vpp == dvp) {
647 VREF(dvp);
648 *vpp = dvp;
649 return (0);
650 }
651 }
652 error = devfs_allocv(de, dvp->v_mount, vpp, td);
653 *dm_unlock = 0;
654 return (error);
655 }
656
657 static int
658 devfs_lookup(struct vop_lookup_args *ap)
659 {
660 int j;
661 struct devfs_mount *dmp;
662 int dm_unlock;
663
664 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
665 dm_unlock = 1;
666 sx_xlock(&dmp->dm_lock);
667 j = devfs_lookupx(ap, &dm_unlock);
668 if (dm_unlock == 1)
669 sx_xunlock(&dmp->dm_lock);
670 return (j);
671 }
672
673 static int
674 devfs_mknod(struct vop_mknod_args *ap)
675 {
676 struct componentname *cnp;
677 struct vnode *dvp, **vpp;
678 struct thread *td;
679 struct devfs_dirent *dd, *de;
680 struct devfs_mount *dmp;
681 int error;
682
683 /*
684 * The only type of node we should be creating here is a
685 * character device, for anything else return EOPNOTSUPP.
686 */
687 if (ap->a_vap->va_type != VCHR)
688 return (EOPNOTSUPP);
689 dvp = ap->a_dvp;
690 dmp = VFSTODEVFS(dvp->v_mount);
691
692 cnp = ap->a_cnp;
693 vpp = ap->a_vpp;
694 td = cnp->cn_thread;
695 dd = dvp->v_data;
696
697 error = ENOENT;
698 sx_xlock(&dmp->dm_lock);
699 TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
700 if (cnp->cn_namelen != de->de_dirent->d_namlen)
701 continue;
702 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name,
703 de->de_dirent->d_namlen) != 0)
704 continue;
705 if (de->de_flags & DE_WHITEOUT)
706 break;
707 goto notfound;
708 }
709 if (de == NULL)
710 goto notfound;
711 de->de_flags &= ~DE_WHITEOUT;
712 error = devfs_allocv(de, dvp->v_mount, vpp, td);
713 return (error);
714 notfound:
715 sx_xunlock(&dmp->dm_lock);
716 return (error);
717 }
718
719 /* ARGSUSED */
720 static int
721 devfs_open(struct vop_open_args *ap)
722 {
723 struct thread *td = ap->a_td;
724 struct vnode *vp = ap->a_vp;
725 struct cdev *dev = vp->v_rdev;
726 struct file *fp;
727 int error;
728 struct cdevsw *dsw;
729
730 if (vp->v_type == VBLK)
731 return (ENXIO);
732
733 if (dev == NULL)
734 return (ENXIO);
735
736 /* Make this field valid before any I/O in d_open. */
737 if (dev->si_iosize_max == 0)
738 dev->si_iosize_max = DFLTPHYS;
739
740 if (vn_isdisk(vp, NULL) &&
741 ap->a_cred != FSCRED && (ap->a_mode & FWRITE)) {
742 /*
743 * When running in very secure mode, do not allow
744 * opens for writing of any disks.
745 * XXX: should be in geom_dev.c, but we lack the cred there.
746 */
747 error = securelevel_ge(td->td_ucred, 2);
748 if (error)
749 return (error);
750 }
751
752 dsw = dev_refthread(dev);
753 if (dsw == NULL)
754 return (ENXIO);
755
756 /* XXX: Special casing of ttys for deadfs. Probably redundant. */
757 if (dsw->d_flags & D_TTY)
758 vp->v_vflag |= VV_ISTTY;
759
760 VOP_UNLOCK(vp, 0, td);
761
762 if (ap->a_fdidx >= 0)
763 ap->a_td->td_proc->p_fd->fd_ofiles[ap->a_fdidx]->f_vnode = vp;
764
765 if(!(dsw->d_flags & D_NEEDGIANT)) {
766 DROP_GIANT();
767 if (dsw->d_fdopen != NULL)
768 error = dsw->d_fdopen(dev, ap->a_mode, td, ap->a_fdidx);
769 else
770 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td);
771 PICKUP_GIANT();
772 } else {
773 if (dsw->d_fdopen != NULL)
774 error = dsw->d_fdopen(dev, ap->a_mode, td, ap->a_fdidx);
775 else
776 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td);
777 }
778
779 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
780
781 dev_relthread(dev);
782
783 if (error)
784 return (error);
785
786 #if 0 /* /dev/console */
787 KASSERT(ap->a_fdidx >= 0,
788 ("Could not vnode bypass device on fd %d", ap->a_fdidx));
789 #else
790 if(ap->a_fdidx < 0)
791 return (error);
792 #endif
793 /*
794 * This is a pretty disgustingly long chain, but I am not
795 * sure there is any better way. Passing the fdidx into
796 * VOP_OPEN() offers us more information than just passing
797 * the file *.
798 */
799 fp = ap->a_td->td_proc->p_fd->fd_ofiles[ap->a_fdidx];
800 KASSERT(fp->f_ops == &badfileops,
801 ("Could not vnode bypass device on fdops %p", fp->f_ops));
802 fp->f_ops = &devfs_ops_f;
803 fp->f_data = dev;
804 return (error);
805 }
806
807 static int
808 devfs_pathconf(struct vop_pathconf_args *ap)
809 {
810
811 switch (ap->a_name) {
812 case _PC_MAC_PRESENT:
813 #ifdef MAC
814 /*
815 * If MAC is enabled, devfs automatically supports
816 * trivial non-persistant label storage.
817 */
818 *ap->a_retval = 1;
819 #else
820 *ap->a_retval = 0;
821 #endif
822 return (0);
823 default:
824 return (vop_stdpathconf(ap));
825 }
826 /* NOTREACHED */
827 }
828
829 /* ARGSUSED */
830 static int
831 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td)
832 {
833 struct cdev *dev;
834 struct cdevsw *dsw;
835 int error;
836
837 error = devfs_fp_check(fp, &dev, &dsw);
838 if (error)
839 return (error);
840 error = dsw->d_poll(dev, events, td);
841 dev_relthread(dev);
842 return(error);
843 }
844
845 /*
846 * Print out the contents of a special device vnode.
847 */
848 static int
849 devfs_print(struct vop_print_args *ap)
850 {
851
852 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev));
853 return (0);
854 }
855
856 /* ARGSUSED */
857 static int
858 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td)
859 {
860 struct cdev *dev;
861 int ioflag, error, resid;
862 struct cdevsw *dsw;
863
864 error = devfs_fp_check(fp, &dev, &dsw);
865 if (error)
866 return (error);
867 resid = uio->uio_resid;
868 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT);
869 if (ioflag & O_DIRECT)
870 ioflag |= IO_DIRECT;
871
872 if ((flags & FOF_OFFSET) == 0)
873 uio->uio_offset = fp->f_offset;
874
875 error = dsw->d_read(dev, uio, ioflag);
876 if (uio->uio_resid != resid || (error == 0 && resid != 0))
877 vfs_timestamp(&dev->si_atime);
878 dev_relthread(dev);
879
880 if ((flags & FOF_OFFSET) == 0)
881 fp->f_offset = uio->uio_offset;
882 fp->f_nextoff = uio->uio_offset;
883 return (error);
884 }
885
886 static int
887 devfs_readdir(struct vop_readdir_args *ap)
888 {
889 int error;
890 struct uio *uio;
891 struct dirent *dp;
892 struct devfs_dirent *dd;
893 struct devfs_dirent *de;
894 struct devfs_mount *dmp;
895 off_t off, oldoff;
896 int *tmp_ncookies = NULL;
897
898 if (ap->a_vp->v_type != VDIR)
899 return (ENOTDIR);
900
901 uio = ap->a_uio;
902 if (uio->uio_offset < 0)
903 return (EINVAL);
904
905 /*
906 * XXX: This is a temporary hack to get around this filesystem not
907 * supporting cookies. We store the location of the ncookies pointer
908 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent()
909 * and set the number of cookies to 0. We then set the pointer to
910 * NULL so that vfs_read_dirent doesn't try to call realloc() on
911 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies
912 * pointer to its original location before returning to the caller.
913 */
914 if (ap->a_ncookies != NULL) {
915 tmp_ncookies = ap->a_ncookies;
916 *ap->a_ncookies = 0;
917 ap->a_ncookies = NULL;
918 }
919
920 dmp = VFSTODEVFS(ap->a_vp->v_mount);
921 sx_xlock(&dmp->dm_lock);
922 DEVFS_DMP_HOLD(dmp);
923 devfs_populate(dmp);
924 if (DEVFS_DMP_DROP(dmp)) {
925 sx_xunlock(&dmp->dm_lock);
926 devfs_unmount_final(dmp);
927 if (tmp_ncookies != NULL)
928 ap->a_ncookies = tmp_ncookies;
929 return (EIO);
930 }
931 error = 0;
932 de = ap->a_vp->v_data;
933 off = 0;
934 oldoff = uio->uio_offset;
935 TAILQ_FOREACH(dd, &de->de_dlist, de_list) {
936 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__));
937 if (dd->de_flags & DE_WHITEOUT)
938 continue;
939 if (dd->de_dirent->d_type == DT_DIR)
940 de = dd->de_dir;
941 else
942 de = dd;
943 dp = dd->de_dirent;
944 if (dp->d_reclen > uio->uio_resid)
945 break;
946 dp->d_fileno = de->de_inode;
947 if (off >= uio->uio_offset) {
948 error = vfs_read_dirent(ap, dp, off);
949 if (error)
950 break;
951 }
952 off += dp->d_reclen;
953 }
954 sx_xunlock(&dmp->dm_lock);
955 uio->uio_offset = off;
956
957 /*
958 * Restore ap->a_ncookies if it wasn't originally NULL in the first
959 * place.
960 */
961 if (tmp_ncookies != NULL)
962 ap->a_ncookies = tmp_ncookies;
963
964 return (error);
965 }
966
967 static int
968 devfs_readlink(struct vop_readlink_args *ap)
969 {
970 struct devfs_dirent *de;
971
972 de = ap->a_vp->v_data;
973 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio));
974 }
975
976 static int
977 devfs_reclaim(struct vop_reclaim_args *ap)
978 {
979 struct vnode *vp = ap->a_vp;
980 struct devfs_dirent *de;
981 struct cdev *dev;
982
983 mtx_lock(&devfs_de_interlock);
984 de = vp->v_data;
985 if (de != NULL) {
986 de->de_vnode = NULL;
987 vp->v_data = NULL;
988 }
989 mtx_unlock(&devfs_de_interlock);
990
991 vnode_destroy_vobject(vp);
992
993 VI_LOCK(vp);
994 dev_lock();
995 dev = vp->v_rdev;
996 vp->v_rdev = NULL;
997
998 if (dev == NULL) {
999 dev_unlock();
1000 VI_UNLOCK(vp);
1001 return (0);
1002 }
1003
1004 dev->si_usecount -= vp->v_usecount;
1005 dev_unlock();
1006 VI_UNLOCK(vp);
1007 dev_rel(dev);
1008 return (0);
1009 }
1010
1011 static int
1012 devfs_remove(struct vop_remove_args *ap)
1013 {
1014 struct vnode *vp = ap->a_vp;
1015 struct devfs_dirent *dd;
1016 struct devfs_dirent *de;
1017 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount);
1018
1019 sx_xlock(&dmp->dm_lock);
1020 dd = ap->a_dvp->v_data;
1021 de = vp->v_data;
1022 if (de->de_cdp == NULL) {
1023 TAILQ_REMOVE(&dd->de_dlist, de, de_list);
1024 devfs_delete(dmp, de, 1);
1025 } else {
1026 de->de_flags |= DE_WHITEOUT;
1027 }
1028 sx_xunlock(&dmp->dm_lock);
1029 return (0);
1030 }
1031
1032 /*
1033 * Revoke is called on a tty when a terminal session ends. The vnode
1034 * is orphaned by setting v_op to deadfs so we need to let go of it
1035 * as well so that we create a new one next time around.
1036 *
1037 */
1038 static int
1039 devfs_revoke(struct vop_revoke_args *ap)
1040 {
1041 struct vnode *vp = ap->a_vp, *vp2;
1042 struct cdev *dev;
1043 struct cdev_priv *cdp;
1044 struct devfs_dirent *de;
1045 int i;
1046
1047 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL"));
1048
1049 dev = vp->v_rdev;
1050 cdp = dev->si_priv;
1051
1052 dev_lock();
1053 cdp->cdp_inuse++;
1054 dev_unlock();
1055
1056 vhold(vp);
1057 vgone(vp);
1058 vdrop(vp);
1059
1060 VOP_UNLOCK(vp,0,curthread);
1061 loop:
1062 for (;;) {
1063 mtx_lock(&devfs_de_interlock);
1064 dev_lock();
1065 vp2 = NULL;
1066 for (i = 0; i <= cdp->cdp_maxdirent; i++) {
1067 de = cdp->cdp_dirents[i];
1068 if (de == NULL)
1069 continue;
1070
1071 vp2 = de->de_vnode;
1072 if (vp2 != NULL) {
1073 dev_unlock();
1074 VI_LOCK(vp2);
1075 mtx_unlock(&devfs_de_interlock);
1076 if (vget(vp2, LK_EXCLUSIVE | LK_INTERLOCK,
1077 curthread))
1078 goto loop;
1079 vhold(vp2);
1080 vgone(vp2);
1081 vdrop(vp2);
1082 vput(vp2);
1083 break;
1084 }
1085 }
1086 if (vp2 != NULL) {
1087 continue;
1088 }
1089 dev_unlock();
1090 mtx_unlock(&devfs_de_interlock);
1091 break;
1092 }
1093 dev_lock();
1094 cdp->cdp_inuse--;
1095 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) {
1096 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list);
1097 dev_unlock();
1098 dev_rel(&cdp->cdp_c);
1099 } else
1100 dev_unlock();
1101
1102 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, curthread);
1103 return (0);
1104 }
1105
1106 static int
1107 devfs_rioctl(struct vop_ioctl_args *ap)
1108 {
1109 int error;
1110 struct devfs_mount *dmp;
1111
1112 dmp = VFSTODEVFS(ap->a_vp->v_mount);
1113 sx_xlock(&dmp->dm_lock);
1114 DEVFS_DMP_HOLD(dmp);
1115 devfs_populate(dmp);
1116 if (DEVFS_DMP_DROP(dmp)) {
1117 sx_xunlock(&dmp->dm_lock);
1118 devfs_unmount_final(dmp);
1119 return (ENOENT);
1120 }
1121 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td);
1122 sx_xunlock(&dmp->dm_lock);
1123 return (error);
1124 }
1125
1126 static int
1127 devfs_rread(struct vop_read_args *ap)
1128 {
1129
1130 if (ap->a_vp->v_type != VDIR)
1131 return (EINVAL);
1132 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL));
1133 }
1134
1135 static int
1136 devfs_setattr(struct vop_setattr_args *ap)
1137 {
1138 struct devfs_dirent *de;
1139 struct vattr *vap;
1140 struct vnode *vp;
1141 int c, error;
1142 uid_t uid;
1143 gid_t gid;
1144
1145 vap = ap->a_vap;
1146 vp = ap->a_vp;
1147 if ((vap->va_type != VNON) ||
1148 (vap->va_nlink != VNOVAL) ||
1149 (vap->va_fsid != VNOVAL) ||
1150 (vap->va_fileid != VNOVAL) ||
1151 (vap->va_blocksize != VNOVAL) ||
1152 (vap->va_flags != VNOVAL && vap->va_flags != 0) ||
1153 (vap->va_rdev != VNOVAL) ||
1154 ((int)vap->va_bytes != VNOVAL) ||
1155 (vap->va_gen != VNOVAL)) {
1156 return (EINVAL);
1157 }
1158
1159 de = vp->v_data;
1160 if (vp->v_type == VDIR)
1161 de = de->de_dir;
1162
1163 error = c = 0;
1164 if (vap->va_uid == (uid_t)VNOVAL)
1165 uid = de->de_uid;
1166 else
1167 uid = vap->va_uid;
1168 if (vap->va_gid == (gid_t)VNOVAL)
1169 gid = de->de_gid;
1170 else
1171 gid = vap->va_gid;
1172 if (uid != de->de_uid || gid != de->de_gid) {
1173 if (((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid ||
1174 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) &&
1175 (error = suser_cred(ap->a_td->td_ucred, SUSER_ALLOWJAIL)) != 0)
1176 return (error);
1177 de->de_uid = uid;
1178 de->de_gid = gid;
1179 c = 1;
1180 }
1181
1182 if (vap->va_mode != (mode_t)VNOVAL) {
1183 if ((ap->a_cred->cr_uid != de->de_uid) &&
1184 (error = suser_cred(ap->a_td->td_ucred, SUSER_ALLOWJAIL)))
1185 return (error);
1186 de->de_mode = vap->va_mode;
1187 c = 1;
1188 }
1189
1190 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
1191 /* See the comment in ufs_vnops::ufs_setattr(). */
1192 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, ap->a_td)) &&
1193 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
1194 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, ap->a_td))))
1195 return (error);
1196 if (vap->va_atime.tv_sec != VNOVAL) {
1197 if (vp->v_type == VCHR)
1198 vp->v_rdev->si_atime = vap->va_atime;
1199 else
1200 de->de_atime = vap->va_atime;
1201 }
1202 if (vap->va_mtime.tv_sec != VNOVAL) {
1203 if (vp->v_type == VCHR)
1204 vp->v_rdev->si_mtime = vap->va_mtime;
1205 else
1206 de->de_mtime = vap->va_mtime;
1207 }
1208 c = 1;
1209 }
1210
1211 if (c) {
1212 if (vp->v_type == VCHR)
1213 vfs_timestamp(&vp->v_rdev->si_ctime);
1214 else
1215 vfs_timestamp(&de->de_mtime);
1216 }
1217 return (0);
1218 }
1219
1220 #ifdef MAC
1221 static int
1222 devfs_setlabel(struct vop_setlabel_args *ap)
1223 {
1224 struct vnode *vp;
1225 struct devfs_dirent *de;
1226
1227 vp = ap->a_vp;
1228 de = vp->v_data;
1229
1230 mac_relabel_vnode(ap->a_cred, vp, ap->a_label);
1231 mac_update_devfsdirent(vp->v_mount, de, vp);
1232
1233 return (0);
1234 }
1235 #endif
1236
1237 static int
1238 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td)
1239 {
1240
1241 return (vnops.fo_stat(fp, sb, cred, td));
1242 }
1243
1244 static int
1245 devfs_symlink(struct vop_symlink_args *ap)
1246 {
1247 int i, error;
1248 struct devfs_dirent *dd;
1249 struct devfs_dirent *de;
1250 struct devfs_mount *dmp;
1251 struct thread *td;
1252
1253 td = ap->a_cnp->cn_thread;
1254 KASSERT(td == curthread, ("devfs_symlink: td != curthread"));
1255 error = suser(td);
1256 if (error)
1257 return(error);
1258 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
1259 dd = ap->a_dvp->v_data;
1260 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen);
1261 de->de_uid = 0;
1262 de->de_gid = 0;
1263 de->de_mode = 0755;
1264 de->de_inode = alloc_unr(devfs_inos);
1265 de->de_dirent->d_type = DT_LNK;
1266 i = strlen(ap->a_target) + 1;
1267 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK);
1268 bcopy(ap->a_target, de->de_symlink, i);
1269 sx_xlock(&dmp->dm_lock);
1270 #ifdef MAC
1271 mac_create_devfs_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de);
1272 #endif
1273 TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list);
1274 return (devfs_allocv(de, ap->a_dvp->v_mount, ap->a_vpp, td));
1275 }
1276
1277 /* ARGSUSED */
1278 static int
1279 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td)
1280 {
1281 struct cdev *dev;
1282 int error, ioflag, resid;
1283 struct cdevsw *dsw;
1284
1285 error = devfs_fp_check(fp, &dev, &dsw);
1286 if (error)
1287 return (error);
1288 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td));
1289 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC);
1290 if (ioflag & O_DIRECT)
1291 ioflag |= IO_DIRECT;
1292 if ((flags & FOF_OFFSET) == 0)
1293 uio->uio_offset = fp->f_offset;
1294
1295 resid = uio->uio_resid;
1296
1297 error = dsw->d_write(dev, uio, ioflag);
1298 if (uio->uio_resid != resid || (error == 0 && resid != 0)) {
1299 vfs_timestamp(&dev->si_ctime);
1300 dev->si_mtime = dev->si_ctime;
1301 }
1302 dev_relthread(dev);
1303
1304 if ((flags & FOF_OFFSET) == 0)
1305 fp->f_offset = uio->uio_offset;
1306 fp->f_nextoff = uio->uio_offset;
1307 return (error);
1308 }
1309
1310 dev_t
1311 dev2udev(struct cdev *x)
1312 {
1313 if (x == NULL)
1314 return (NODEV);
1315 return (x->si_priv->cdp_inode);
1316 }
1317
1318 static struct fileops devfs_ops_f = {
1319 .fo_read = devfs_read_f,
1320 .fo_write = devfs_write_f,
1321 .fo_ioctl = devfs_ioctl_f,
1322 .fo_poll = devfs_poll_f,
1323 .fo_kqfilter = devfs_kqfilter_f,
1324 .fo_stat = devfs_stat_f,
1325 .fo_close = devfs_close_f,
1326 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE
1327 };
1328
1329 static struct vop_vector devfs_vnodeops = {
1330 .vop_default = &default_vnodeops,
1331
1332 .vop_access = devfs_access,
1333 .vop_getattr = devfs_getattr,
1334 .vop_ioctl = devfs_rioctl,
1335 .vop_lookup = devfs_lookup,
1336 .vop_mknod = devfs_mknod,
1337 .vop_pathconf = devfs_pathconf,
1338 .vop_read = devfs_rread,
1339 .vop_readdir = devfs_readdir,
1340 .vop_readlink = devfs_readlink,
1341 .vop_reclaim = devfs_reclaim,
1342 .vop_remove = devfs_remove,
1343 .vop_revoke = devfs_revoke,
1344 .vop_setattr = devfs_setattr,
1345 #ifdef MAC
1346 .vop_setlabel = devfs_setlabel,
1347 #endif
1348 .vop_symlink = devfs_symlink,
1349 };
1350
1351 static struct vop_vector devfs_specops = {
1352 .vop_default = &default_vnodeops,
1353
1354 .vop_access = devfs_access,
1355 .vop_advlock = devfs_advlock,
1356 .vop_bmap = VOP_PANIC,
1357 .vop_close = devfs_close,
1358 .vop_create = VOP_PANIC,
1359 .vop_fsync = devfs_fsync,
1360 .vop_getattr = devfs_getattr,
1361 .vop_lease = VOP_NULL,
1362 .vop_link = VOP_PANIC,
1363 .vop_mkdir = VOP_PANIC,
1364 .vop_mknod = VOP_PANIC,
1365 .vop_open = devfs_open,
1366 .vop_pathconf = devfs_pathconf,
1367 .vop_print = devfs_print,
1368 .vop_read = VOP_PANIC,
1369 .vop_readdir = VOP_PANIC,
1370 .vop_readlink = VOP_PANIC,
1371 .vop_reallocblks = VOP_PANIC,
1372 .vop_reclaim = devfs_reclaim,
1373 .vop_remove = devfs_remove,
1374 .vop_rename = VOP_PANIC,
1375 .vop_revoke = devfs_revoke,
1376 .vop_rmdir = VOP_PANIC,
1377 .vop_setattr = devfs_setattr,
1378 #ifdef MAC
1379 .vop_setlabel = devfs_setlabel,
1380 #endif
1381 .vop_strategy = VOP_PANIC,
1382 .vop_symlink = VOP_PANIC,
1383 .vop_write = VOP_PANIC,
1384 };
1385
1386 /*
1387 * Our calling convention to the device drivers used to be that we passed
1388 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_
1389 * flags instead since that's what open(), close() and ioctl() takes and
1390 * we don't really want vnode.h in device drivers.
1391 * We solved the source compatibility by redefining some vnode flags to
1392 * be the same as the fcntl ones and by sending down the bitwise OR of
1393 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody
1394 * pulls the rug out under this.
1395 */
1396 CTASSERT(O_NONBLOCK == IO_NDELAY);
1397 CTASSERT(O_FSYNC == IO_SYNC);
Cache object: 2200b72e218c80ec68fc1d370ca1033a
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