35 */
36
37/*
38 * TODO:
39 * remove empty directories
40 * mknod: hunt down DE_DELETED, compare name, reinstantiate.
41 * mkdir: want it ?
42 */
43
44#include <opt_devfs.h>
45#include <opt_mac.h>
46#ifndef NODEVFS
47
48#include <sys/param.h>
49#include <sys/systm.h>
50#include <sys/conf.h>
51#include <sys/dirent.h>
52#include <sys/kernel.h>
53#include <sys/lock.h>
54#include <sys/mac.h>
55#include <sys/malloc.h>
56#include <sys/mount.h>
57#include <sys/namei.h>
58#include <sys/proc.h>
59#include <sys/time.h>
60#include <sys/unistd.h>
61#include <sys/vnode.h>
62
63#include <fs/devfs/devfs.h>
64
65static int devfs_access(struct vop_access_args *ap);
66static int devfs_getattr(struct vop_getattr_args *ap);
67static int devfs_ioctl(struct vop_ioctl_args *ap);
68static int devfs_lookupx(struct vop_lookup_args *ap);
69static int devfs_mknod(struct vop_mknod_args *ap);
70static int devfs_pathconf(struct vop_pathconf_args *ap);
71static int devfs_read(struct vop_read_args *ap);
72static int devfs_readdir(struct vop_readdir_args *ap);
73static int devfs_readlink(struct vop_readlink_args *ap);
74static int devfs_reclaim(struct vop_reclaim_args *ap);
75#ifdef MAC
76static int devfs_refreshlabel(struct vop_refreshlabel_args *ap);
77#endif
78static int devfs_remove(struct vop_remove_args *ap);
79static int devfs_revoke(struct vop_revoke_args *ap);
80static int devfs_setattr(struct vop_setattr_args *ap);
81#ifdef MAC
82static int devfs_setlabel(struct vop_setlabel_args *ap);
83#endif
84static int devfs_symlink(struct vop_symlink_args *ap);
85
86static vop_t **devfs_vnodeop_p;
87static vop_t **devfs_specop_p;
88
89/*
90 * Construct the fully qualified path name relative to the mountpoint
91 */
92static char *
93devfs_fqpn(char *buf, struct vnode *dvp, struct componentname *cnp)
94{
95 int i;
96 struct devfs_dirent *de, *dd;
97 struct devfs_mount *dmp;
98
99 dmp = VFSTODEVFS(dvp->v_mount);
100 dd = dvp->v_data;
101 i = SPECNAMELEN;
102 buf[i] = '\0';
103 i -= cnp->cn_namelen;
104 if (i < 0)
105 return (NULL);
106 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen);
107 de = dd;
108 while (de != dmp->dm_basedir) {
109 i--;
110 if (i < 0)
111 return (NULL);
112 buf[i] = '/';
113 i -= de->de_dirent->d_namlen;
114 if (i < 0)
115 return (NULL);
116 bcopy(de->de_dirent->d_name, buf + i,
117 de->de_dirent->d_namlen);
118 de = TAILQ_FIRST(&de->de_dlist); /* "." */
119 de = TAILQ_NEXT(de, de_list); /* ".." */
120 de = de->de_dir;
121 }
122 return (buf + i);
123}
124
125int
126devfs_allocv(struct devfs_dirent *de, struct mount *mp, struct vnode **vpp, struct thread *td)
127{
128 int error;
129 struct vnode *vp;
130 dev_t dev;
131
132 if (td == NULL)
133 td = curthread; /* XXX */
134loop:
135 vp = de->de_vnode;
136 if (vp != NULL) {
137 if (vget(vp, LK_EXCLUSIVE, td ? td : curthread))
138 goto loop;
139 *vpp = vp;
140 return (0);
141 }
142 if (de->de_dirent->d_type == DT_CHR) {
143 dev = *devfs_itod(de->de_inode);
144 if (dev == NULL)
145 return (ENOENT);
146 } else {
147 dev = NODEV;
148 }
149 error = getnewvnode("devfs", mp, devfs_vnodeop_p, &vp);
150 if (error != 0) {
151 printf("devfs_allocv: failed to allocate new vnode\n");
152 return (error);
153 }
154
155 if (de->de_dirent->d_type == DT_CHR) {
156 vp->v_type = VCHR;
157 vp = addaliasu(vp, dev->si_udev);
158 vp->v_op = devfs_specop_p;
159 } else if (de->de_dirent->d_type == DT_DIR) {
160 vp->v_type = VDIR;
161 } else if (de->de_dirent->d_type == DT_LNK) {
162 vp->v_type = VLNK;
163 } else {
164 vp->v_type = VBAD;
165 }
166 vp->v_data = de;
167 de->de_vnode = vp;
168 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
169#ifdef MAC
170 mac_create_devfs_vnode(de, vp);
171#endif
172 *vpp = vp;
173 return (0);
174}
175
176static int
177devfs_access(ap)
178 struct vop_access_args /* {
179 struct vnode *a_vp;
180 int a_mode;
181 struct ucred *a_cred;
182 struct thread *a_td;
183 } */ *ap;
184{
185 struct vnode *vp = ap->a_vp;
186 struct devfs_dirent *de;
187
188 de = vp->v_data;
189 if (vp->v_type == VDIR)
190 de = de->de_dir;
191
192 return (vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid,
193 ap->a_mode, ap->a_cred, NULL));
194}
195
196static int
197devfs_getattr(ap)
198 struct vop_getattr_args /* {
199 struct vnode *a_vp;
200 struct vattr *a_vap;
201 struct ucred *a_cred;
202 struct thread *a_td;
203 } */ *ap;
204{
205 struct vnode *vp = ap->a_vp;
206 struct vattr *vap = ap->a_vap;
207 int error = 0;
208 struct devfs_dirent *de;
209 dev_t dev;
210
211 de = vp->v_data;
212 if (vp->v_type == VDIR)
213 de = de->de_dir;
214 bzero((caddr_t) vap, sizeof(*vap));
215 vattr_null(vap);
216 vap->va_uid = de->de_uid;
217 vap->va_gid = de->de_gid;
218 vap->va_mode = de->de_mode;
219 if (vp->v_type == VLNK)
220 vap->va_size = de->de_dirent->d_namlen;
221 else if (vp->v_type == VDIR)
222 vap->va_size = vap->va_bytes = DEV_BSIZE;
223 else
224 vap->va_size = 0;
225 if (vp->v_type != VDIR)
226 vap->va_bytes = 0;
227 vap->va_blocksize = DEV_BSIZE;
228 vap->va_type = vp->v_type;
229
230#define fix(aa) \
231 do { \
232 if ((aa).tv_sec == 0) { \
233 (aa).tv_sec = boottime.tv_sec; \
234 (aa).tv_nsec = boottime.tv_usec * 1000; \
235 } \
236 } while (0)
237
238 if (vp->v_type != VCHR) {
239 fix(de->de_atime);
240 vap->va_atime = de->de_atime;
241 fix(de->de_mtime);
242 vap->va_mtime = de->de_mtime;
243 fix(de->de_ctime);
244 vap->va_ctime = de->de_ctime;
245 } else {
246 dev = vp->v_rdev;
247 fix(dev->si_atime);
248 vap->va_atime = dev->si_atime;
249 fix(dev->si_mtime);
250 vap->va_mtime = dev->si_mtime;
251 fix(dev->si_ctime);
252 vap->va_ctime = dev->si_ctime;
253 vap->va_rdev = dev->si_udev;
254 }
255 vap->va_gen = 0;
256 vap->va_flags = 0;
257 vap->va_nlink = de->de_links;
258 vap->va_fileid = de->de_inode;
259
260 return (error);
261}
262
263static int
264devfs_ioctl(ap)
265 struct vop_ioctl_args /* {
266 struct vnode *a_vp;
267 int a_command;
268 caddr_t a_data;
269 int a_fflag;
270 struct ucred *a_cred;
271 struct thread *a_td;
272 } */ *ap;
273{
274 int error;
275
276 error = devfs_rules_ioctl(ap->a_vp->v_mount, ap->a_command, ap->a_data,
277 ap->a_td);
278 return (error);
279}
280
281static int
282devfs_lookupx(ap)
283 struct vop_lookup_args /* {
284 struct vnode * a_dvp;
285 struct vnode ** a_vpp;
286 struct componentname * a_cnp;
287 } */ *ap;
288{
289 struct componentname *cnp;
290 struct vnode *dvp, **vpp;
291 struct thread *td;
292 struct devfs_dirent *de, *dd;
293 struct devfs_mount *dmp;
294 dev_t cdev, *cpdev;
295 int error, cloned, flags, nameiop;
296 char specname[SPECNAMELEN + 1], *pname;
297
298 cnp = ap->a_cnp;
299 vpp = ap->a_vpp;
300 dvp = ap->a_dvp;
301 pname = cnp->cn_nameptr;
302 td = cnp->cn_thread;
303 flags = cnp->cn_flags;
304 nameiop = cnp->cn_nameiop;
305 dmp = VFSTODEVFS(dvp->v_mount);
306 cloned = 0;
307 dd = dvp->v_data;
308
309 *vpp = NULLVP;
310 cnp->cn_flags &= ~PDIRUNLOCK;
311
312 if ((flags & ISLASTCN) && nameiop == RENAME)
313 return (EOPNOTSUPP);
314
315 if (dvp->v_type != VDIR)
316 return (ENOTDIR);
317
318 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT))
319 return (EIO);
320
321 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td);
322 if (error)
323 return (error);
324
325 if (cnp->cn_namelen == 1 && *pname == '.') {
326 if ((flags & ISLASTCN) && nameiop != LOOKUP)
327 return (EINVAL);
328 *vpp = dvp;
329 VREF(dvp);
330 return (0);
331 }
332
333 if (flags & ISDOTDOT) {
334 if ((flags & ISLASTCN) && nameiop != LOOKUP)
335 return (EINVAL);
336 VOP_UNLOCK(dvp, 0, td);
337 cnp->cn_flags |= PDIRUNLOCK;
338 de = TAILQ_FIRST(&dd->de_dlist); /* "." */
339 de = TAILQ_NEXT(de, de_list); /* ".." */
340 de = de->de_dir;
341 error = devfs_allocv(de, dvp->v_mount, vpp, td);
342 if (error || ((flags & LOCKPARENT) && (flags & ISLASTCN))) {
343 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
344 cnp->cn_flags &= ~PDIRUNLOCK;
345 }
346 return (error);
347 }
348
349 devfs_populate(dmp);
350 dd = dvp->v_data;
351 TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
352 if (cnp->cn_namelen != de->de_dirent->d_namlen)
353 continue;
354 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name,
355 de->de_dirent->d_namlen) != 0)
356 continue;
357 if (de->de_flags & DE_WHITEOUT)
358 goto notfound;
359 goto found;
360 }
361
362 if (nameiop == DELETE)
363 goto notfound;
364
365 /*
366 * OK, we didn't have an entry for the name we were asked for
367 * so we try to see if anybody can create it on demand.
368 */
369 pname = devfs_fqpn(specname, dvp, cnp);
370 if (pname == NULL)
371 goto notfound;
372
373 cdev = NODEV;
374 EVENTHANDLER_INVOKE(dev_clone, pname, strlen(pname), &cdev);
375 if (cdev == NODEV)
376 goto notfound;
377
378 devfs_populate(dmp);
379 dd = dvp->v_data;
380
381 TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
382 cpdev = devfs_itod(de->de_inode);
383 if (cpdev != NULL && cdev == *cpdev)
384 goto found;
385 continue;
386 }
387
388notfound:
389
390 if ((nameiop == CREATE || nameiop == RENAME) &&
391 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) {
392 cnp->cn_flags |= SAVENAME;
393 if (!(flags & LOCKPARENT)) {
394 VOP_UNLOCK(dvp, 0, td);
395 cnp->cn_flags |= PDIRUNLOCK;
396 }
397 return (EJUSTRETURN);
398 }
399 return (ENOENT);
400
401
402found:
403
404 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) {
405 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
406 if (error)
407 return (error);
408 if (*vpp == dvp) {
409 VREF(dvp);
410 *vpp = dvp;
411 return (0);
412 }
413 error = devfs_allocv(de, dvp->v_mount, vpp, td);
414 if (error)
415 return (error);
416 if (!(flags & LOCKPARENT)) {
417 VOP_UNLOCK(dvp, 0, td);
418 cnp->cn_flags |= PDIRUNLOCK;
419 }
420 return (0);
421 }
422 error = devfs_allocv(de, dvp->v_mount, vpp, td);
423 if (error)
424 return (error);
425 if (!(flags & LOCKPARENT) || !(flags & ISLASTCN)) {
426 VOP_UNLOCK(dvp, 0, td);
427 cnp->cn_flags |= PDIRUNLOCK;
428 }
429 return (0);
430}
431
432static int
433devfs_lookup(struct vop_lookup_args *ap)
434{
435 int j;
436 struct devfs_mount *dmp;
437
438 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
439 lockmgr(&dmp->dm_lock, LK_SHARED, 0, curthread);
440 j = devfs_lookupx(ap);
441 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
442 return (j);
443}
444
445static int
446devfs_mknod(struct vop_mknod_args *ap)
447/*
448struct vop_mknod_args {
449 struct vnodeop_desc *a_desc;
450 struct vnode *a_dvp;
451 struct vnode **a_vpp;
452 struct componentname *a_cnp;
453 struct vattr *a_vap;
454};
455*/
456{
457 struct componentname *cnp;
458 struct vnode *dvp, **vpp;
459 struct thread *td;
460 struct devfs_dirent *dd, *de;
461 struct devfs_mount *dmp;
462 int cloned, flags, nameiop;
463 int error;
464
465 dvp = ap->a_dvp;
466 dmp = VFSTODEVFS(dvp->v_mount);
467 lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, curthread);
468
469 cnp = ap->a_cnp;
470 vpp = ap->a_vpp;
471 td = cnp->cn_thread;
472 flags = cnp->cn_flags;
473 nameiop = cnp->cn_nameiop;
474 cloned = 0;
475 dd = dvp->v_data;
476
477 error = ENOENT;
478 TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
479 if (cnp->cn_namelen != de->de_dirent->d_namlen)
480 continue;
481 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name,
482 de->de_dirent->d_namlen) != 0)
483 continue;
484 if (de->de_flags & DE_WHITEOUT)
485 break;
486 goto notfound;
487 }
488 if (de == NULL)
489 goto notfound;
490 de->de_flags &= ~DE_WHITEOUT;
491 error = devfs_allocv(de, dvp->v_mount, vpp, td);
492notfound:
493 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
494 return (error);
495}
496
497
498static int
499devfs_pathconf(ap)
500 struct vop_pathconf_args /* {
501 struct vnode *a_vp;
502 int a_name;
503 int *a_retval;
504 } */ *ap;
505{
506
507 switch (ap->a_name) {
508 case _PC_NAME_MAX:
509 *ap->a_retval = NAME_MAX;
510 return (0);
511 case _PC_PATH_MAX:
512 *ap->a_retval = PATH_MAX;
513 return (0);
514 case _POSIX_MAC_PRESENT:
515#ifdef MAC
516 /*
517 * If MAC is enabled, devfs automatically supports
518 * trivial non-persistant label storage.
519 */
520 *ap->a_retval = 1;
521#else
522 *ap->a_retval = 0;
523#endif /* MAC */
524 return (0);
525 default:
526 return (vop_stdpathconf(ap));
527 }
528 /* NOTREACHED */
529}
530
531static int
532devfs_read(ap)
533 struct vop_read_args /* {
534 struct vnode *a_vp;
535 struct uio *a_uio;
536 int a_ioflag;
537 struct ucred *a_cred;
538 } */ *ap;
539{
540
541 if (ap->a_vp->v_type != VDIR)
542 return (EINVAL);
543 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL));
544}
545
546static int
547devfs_readdir(ap)
548 struct vop_readdir_args /* {
549 struct vnode *a_vp;
550 struct uio *a_uio;
551 struct ucred *a_cred;
552 int *a_eofflag;
553 int *a_ncookies;
554 u_long **a_cookies;
555 } */ *ap;
556{
557 int error;
558 struct uio *uio;
559 struct dirent *dp;
560 struct devfs_dirent *dd;
561 struct devfs_dirent *de;
562 struct devfs_mount *dmp;
563 off_t off, oldoff;
564 int ncookies = 0;
565 u_long *cookiebuf, *cookiep;
566 struct dirent *dps, *dpe;
567
568 if (ap->a_vp->v_type != VDIR)
569 return (ENOTDIR);
570
571 uio = ap->a_uio;
572 if (uio->uio_offset < 0)
573 return (EINVAL);
574
575 dmp = VFSTODEVFS(ap->a_vp->v_mount);
576 lockmgr(&dmp->dm_lock, LK_SHARED, 0, curthread);
577 devfs_populate(dmp);
578 error = 0;
579 de = ap->a_vp->v_data;
580 off = 0;
581 oldoff = uio->uio_offset;
582 TAILQ_FOREACH(dd, &de->de_dlist, de_list) {
583 if (dd->de_flags & DE_WHITEOUT)
584 continue;
585 if (dd->de_dirent->d_type == DT_DIR)
586 de = dd->de_dir;
587 else
588 de = dd;
589 dp = dd->de_dirent;
590 if (dp->d_reclen > uio->uio_resid)
591 break;
592 dp->d_fileno = de->de_inode;
593 if (off >= uio->uio_offset) {
594 ncookies++;
595 error = uiomove((caddr_t)dp, dp->d_reclen, uio);
596 if (error)
597 break;
598 }
599 off += dp->d_reclen;
600 }
601 if( !error && ap->a_ncookies != NULL && ap->a_cookies != NULL ) {
602 MALLOC(cookiebuf, u_long *, ncookies * sizeof(u_long),
603 M_TEMP, M_WAITOK);
604 cookiep = cookiebuf;
605 dps = (struct dirent *)
606 (uio->uio_iov->iov_base - (uio->uio_offset - oldoff));
607 dpe = (struct dirent *) uio->uio_iov->iov_base;
608 for( dp = dps;
609 dp < dpe;
610 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) {
611 oldoff += dp->d_reclen;
612 *cookiep++ = (u_long) oldoff;
613 }
614 *ap->a_ncookies = ncookies;
615 *ap->a_cookies = cookiebuf;
616 }
617 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
618 uio->uio_offset = off;
619 return (error);
620}
621
622static int
623devfs_readlink(ap)
624 struct vop_readlink_args /* {
625 struct vnode *a_vp;
626 struct uio *a_uio;
627 struct ucred *a_cead;
628 } */ *ap;
629{
630 int error;
631 struct devfs_dirent *de;
632
633 de = ap->a_vp->v_data;
634 error = uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio);
635 return (error);
636}
637
638static int
639devfs_reclaim(ap)
640 struct vop_reclaim_args /* {
641 struct vnode *a_vp;
642 } */ *ap;
643{
644 struct vnode *vp = ap->a_vp;
645 struct devfs_dirent *de;
646 int i;
647
648 de = vp->v_data;
649 if (de != NULL)
650 de->de_vnode = NULL;
651 vp->v_data = NULL;
652 if (vp->v_rdev != NODEV && vp->v_rdev != NULL) {
653 i = vcount(vp);
654 if ((vp->v_rdev->si_flags & SI_CHEAPCLONE) && i == 0 &&
655 (vp->v_rdev->si_flags & SI_NAMED))
656 destroy_dev(vp->v_rdev);
657 }
658 return (0);
659}
660
661#ifdef MAC
662static int
663devfs_refreshlabel(ap)
664 struct vop_refreshlabel_args /* {
665 struct vnode *a_vp;
666 struct ucred *a_cred;
667 } */ *ap;
668{
669
670 /* Labels are always in sync. */
671 return (0);
672}
673#endif
674
675static int
676devfs_remove(ap)
677 struct vop_remove_args /* {
678 struct vnode *a_dvp;
679 struct vnode *a_vp;
680 struct componentname *a_cnp;
681 } */ *ap;
682{
683 struct vnode *vp = ap->a_vp;
684 struct devfs_dirent *dd;
685 struct devfs_dirent *de;
686 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount);
687
688 lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, curthread);
689 dd = ap->a_dvp->v_data;
690 de = vp->v_data;
691 if (de->de_dirent->d_type == DT_LNK) {
692 TAILQ_REMOVE(&dd->de_dlist, de, de_list);
693 if (de->de_vnode)
694 de->de_vnode->v_data = NULL;
695#ifdef MAC
696 mac_destroy_devfsdirent(de);
697#endif
698 FREE(de, M_DEVFS);
699 } else {
700 de->de_flags |= DE_WHITEOUT;
701 }
702 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
703 return (0);
704}
705
706/*
707 * Revoke is called on a tty when a terminal session ends. The vnode
708 * is orphaned by setting v_op to deadfs so we need to let go of it
709 * as well so that we create a new one next time around.
710 */
711static int
712devfs_revoke(ap)
713 struct vop_revoke_args /* {
714 struct vnode *a_vp;
715 int a_flags;
716 } */ *ap;
717{
718 struct vnode *vp = ap->a_vp;
719 struct devfs_dirent *de;
720
721 de = vp->v_data;
722 de->de_vnode = NULL;
723 vop_revoke(ap);
724 return (0);
725}
726
727static int
728devfs_setattr(ap)
729 struct vop_setattr_args /* {
730 struct vnode *a_vp;
731 struct vattr *a_vap;
732 struct ucred *a_cred;
733 struct proc *a_p;
734 } */ *ap;
735{
736 struct devfs_dirent *de;
737 struct vattr *vap;
738 struct vnode *vp;
739 int c, error;
740 uid_t uid;
741 gid_t gid;
742
743 vap = ap->a_vap;
744 vp = ap->a_vp;
745 if ((vap->va_type != VNON) ||
746 (vap->va_nlink != VNOVAL) ||
747 (vap->va_fsid != VNOVAL) ||
748 (vap->va_fileid != VNOVAL) ||
749 (vap->va_blocksize != VNOVAL) ||
750 (vap->va_flags != VNOVAL && vap->va_flags != 0) ||
751 (vap->va_rdev != VNOVAL) ||
752 ((int)vap->va_bytes != VNOVAL) ||
753 (vap->va_gen != VNOVAL)) {
754 return (EINVAL);
755 }
756
757 de = vp->v_data;
758 if (vp->v_type == VDIR)
759 de = de->de_dir;
760
761 error = c = 0;
762 if (vap->va_uid == (uid_t)VNOVAL)
763 uid = de->de_uid;
764 else
765 uid = vap->va_uid;
766 if (vap->va_gid == (gid_t)VNOVAL)
767 gid = de->de_gid;
768 else
769 gid = vap->va_gid;
770 if (uid != de->de_uid || gid != de->de_gid) {
771 if (((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid ||
772 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) &&
773 (error = suser_cred(ap->a_td->td_ucred, PRISON_ROOT)) != 0)
774 return (error);
775 de->de_uid = uid;
776 de->de_gid = gid;
777 c = 1;
778 }
779
780 if (vap->va_mode != (mode_t)VNOVAL) {
781 if ((ap->a_cred->cr_uid != de->de_uid) &&
782 (error = suser_cred(ap->a_td->td_ucred, PRISON_ROOT)))
783 return (error);
784 de->de_mode = vap->va_mode;
785 c = 1;
786 }
787
788 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
789 /* See the comment in ufs_vnops::ufs_setattr(). */
790 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, ap->a_td)) &&
791 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
792 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, ap->a_td))))
793 return (error);
794 if (vap->va_atime.tv_sec != VNOVAL) {
795 if (vp->v_type == VCHR)
796 vp->v_rdev->si_atime = vap->va_atime;
797 else
798 de->de_atime = vap->va_atime;
799 }
800 if (vap->va_mtime.tv_sec != VNOVAL) {
801 if (vp->v_type == VCHR)
802 vp->v_rdev->si_mtime = vap->va_mtime;
803 else
804 de->de_mtime = vap->va_mtime;
805 }
806 c = 1;
807 }
808
809 if (c) {
810 if (vp->v_type == VCHR)
811 vfs_timestamp(&vp->v_rdev->si_ctime);
812 else
813 vfs_timestamp(&de->de_mtime);
814 }
815 return (0);
816}
817
818#ifdef MAC
819static int
820devfs_setlabel(ap)
821 struct vop_setlabel_args /* {
822 struct vnode *a_vp;
823 struct mac *a_label;
824 struct ucred *a_cred;
825 struct thread *a_td;
826 } */ *ap;
827{
828 struct vnode *vp;
829 struct devfs_dirent *de;
830
831 vp = ap->a_vp;
832 de = vp->v_data;
833
834 mac_relabel_vnode(ap->a_cred, vp, ap->a_label);
835 mac_update_devfsdirent(de, vp);
836
837 return (0);
838}
839#endif
840
841static int
842devfs_symlink(ap)
843 struct vop_symlink_args /* {
844 struct vnode *a_dvp;
845 struct vnode **a_vpp;
846 struct componentname *a_cnp;
847 struct vattr *a_vap;
848 char *a_target;
849 } */ *ap;
850{
851 int i, error;
852 struct devfs_dirent *dd;
853 struct devfs_dirent *de;
854 struct devfs_mount *dmp;
855
856 error = suser(ap->a_cnp->cn_thread);
857 if (error)
858 return(error);
859 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
860 dd = ap->a_dvp->v_data;
861 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen);
862 de->de_uid = 0;
863 de->de_gid = 0;
864 de->de_mode = 0755;
865 de->de_inode = dmp->dm_inode++;
866 de->de_dirent->d_type = DT_LNK;
867 i = strlen(ap->a_target) + 1;
868 MALLOC(de->de_symlink, char *, i, M_DEVFS, M_WAITOK);
869 bcopy(ap->a_target, de->de_symlink, i);
870 lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, curthread);
| 35 */
36
37/*
38 * TODO:
39 * remove empty directories
40 * mknod: hunt down DE_DELETED, compare name, reinstantiate.
41 * mkdir: want it ?
42 */
43
44#include <opt_devfs.h>
45#include <opt_mac.h>
46#ifndef NODEVFS
47
48#include <sys/param.h>
49#include <sys/systm.h>
50#include <sys/conf.h>
51#include <sys/dirent.h>
52#include <sys/kernel.h>
53#include <sys/lock.h>
54#include <sys/mac.h>
55#include <sys/malloc.h>
56#include <sys/mount.h>
57#include <sys/namei.h>
58#include <sys/proc.h>
59#include <sys/time.h>
60#include <sys/unistd.h>
61#include <sys/vnode.h>
62
63#include <fs/devfs/devfs.h>
64
65static int devfs_access(struct vop_access_args *ap);
66static int devfs_getattr(struct vop_getattr_args *ap);
67static int devfs_ioctl(struct vop_ioctl_args *ap);
68static int devfs_lookupx(struct vop_lookup_args *ap);
69static int devfs_mknod(struct vop_mknod_args *ap);
70static int devfs_pathconf(struct vop_pathconf_args *ap);
71static int devfs_read(struct vop_read_args *ap);
72static int devfs_readdir(struct vop_readdir_args *ap);
73static int devfs_readlink(struct vop_readlink_args *ap);
74static int devfs_reclaim(struct vop_reclaim_args *ap);
75#ifdef MAC
76static int devfs_refreshlabel(struct vop_refreshlabel_args *ap);
77#endif
78static int devfs_remove(struct vop_remove_args *ap);
79static int devfs_revoke(struct vop_revoke_args *ap);
80static int devfs_setattr(struct vop_setattr_args *ap);
81#ifdef MAC
82static int devfs_setlabel(struct vop_setlabel_args *ap);
83#endif
84static int devfs_symlink(struct vop_symlink_args *ap);
85
86static vop_t **devfs_vnodeop_p;
87static vop_t **devfs_specop_p;
88
89/*
90 * Construct the fully qualified path name relative to the mountpoint
91 */
92static char *
93devfs_fqpn(char *buf, struct vnode *dvp, struct componentname *cnp)
94{
95 int i;
96 struct devfs_dirent *de, *dd;
97 struct devfs_mount *dmp;
98
99 dmp = VFSTODEVFS(dvp->v_mount);
100 dd = dvp->v_data;
101 i = SPECNAMELEN;
102 buf[i] = '\0';
103 i -= cnp->cn_namelen;
104 if (i < 0)
105 return (NULL);
106 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen);
107 de = dd;
108 while (de != dmp->dm_basedir) {
109 i--;
110 if (i < 0)
111 return (NULL);
112 buf[i] = '/';
113 i -= de->de_dirent->d_namlen;
114 if (i < 0)
115 return (NULL);
116 bcopy(de->de_dirent->d_name, buf + i,
117 de->de_dirent->d_namlen);
118 de = TAILQ_FIRST(&de->de_dlist); /* "." */
119 de = TAILQ_NEXT(de, de_list); /* ".." */
120 de = de->de_dir;
121 }
122 return (buf + i);
123}
124
125int
126devfs_allocv(struct devfs_dirent *de, struct mount *mp, struct vnode **vpp, struct thread *td)
127{
128 int error;
129 struct vnode *vp;
130 dev_t dev;
131
132 if (td == NULL)
133 td = curthread; /* XXX */
134loop:
135 vp = de->de_vnode;
136 if (vp != NULL) {
137 if (vget(vp, LK_EXCLUSIVE, td ? td : curthread))
138 goto loop;
139 *vpp = vp;
140 return (0);
141 }
142 if (de->de_dirent->d_type == DT_CHR) {
143 dev = *devfs_itod(de->de_inode);
144 if (dev == NULL)
145 return (ENOENT);
146 } else {
147 dev = NODEV;
148 }
149 error = getnewvnode("devfs", mp, devfs_vnodeop_p, &vp);
150 if (error != 0) {
151 printf("devfs_allocv: failed to allocate new vnode\n");
152 return (error);
153 }
154
155 if (de->de_dirent->d_type == DT_CHR) {
156 vp->v_type = VCHR;
157 vp = addaliasu(vp, dev->si_udev);
158 vp->v_op = devfs_specop_p;
159 } else if (de->de_dirent->d_type == DT_DIR) {
160 vp->v_type = VDIR;
161 } else if (de->de_dirent->d_type == DT_LNK) {
162 vp->v_type = VLNK;
163 } else {
164 vp->v_type = VBAD;
165 }
166 vp->v_data = de;
167 de->de_vnode = vp;
168 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
169#ifdef MAC
170 mac_create_devfs_vnode(de, vp);
171#endif
172 *vpp = vp;
173 return (0);
174}
175
176static int
177devfs_access(ap)
178 struct vop_access_args /* {
179 struct vnode *a_vp;
180 int a_mode;
181 struct ucred *a_cred;
182 struct thread *a_td;
183 } */ *ap;
184{
185 struct vnode *vp = ap->a_vp;
186 struct devfs_dirent *de;
187
188 de = vp->v_data;
189 if (vp->v_type == VDIR)
190 de = de->de_dir;
191
192 return (vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid,
193 ap->a_mode, ap->a_cred, NULL));
194}
195
196static int
197devfs_getattr(ap)
198 struct vop_getattr_args /* {
199 struct vnode *a_vp;
200 struct vattr *a_vap;
201 struct ucred *a_cred;
202 struct thread *a_td;
203 } */ *ap;
204{
205 struct vnode *vp = ap->a_vp;
206 struct vattr *vap = ap->a_vap;
207 int error = 0;
208 struct devfs_dirent *de;
209 dev_t dev;
210
211 de = vp->v_data;
212 if (vp->v_type == VDIR)
213 de = de->de_dir;
214 bzero((caddr_t) vap, sizeof(*vap));
215 vattr_null(vap);
216 vap->va_uid = de->de_uid;
217 vap->va_gid = de->de_gid;
218 vap->va_mode = de->de_mode;
219 if (vp->v_type == VLNK)
220 vap->va_size = de->de_dirent->d_namlen;
221 else if (vp->v_type == VDIR)
222 vap->va_size = vap->va_bytes = DEV_BSIZE;
223 else
224 vap->va_size = 0;
225 if (vp->v_type != VDIR)
226 vap->va_bytes = 0;
227 vap->va_blocksize = DEV_BSIZE;
228 vap->va_type = vp->v_type;
229
230#define fix(aa) \
231 do { \
232 if ((aa).tv_sec == 0) { \
233 (aa).tv_sec = boottime.tv_sec; \
234 (aa).tv_nsec = boottime.tv_usec * 1000; \
235 } \
236 } while (0)
237
238 if (vp->v_type != VCHR) {
239 fix(de->de_atime);
240 vap->va_atime = de->de_atime;
241 fix(de->de_mtime);
242 vap->va_mtime = de->de_mtime;
243 fix(de->de_ctime);
244 vap->va_ctime = de->de_ctime;
245 } else {
246 dev = vp->v_rdev;
247 fix(dev->si_atime);
248 vap->va_atime = dev->si_atime;
249 fix(dev->si_mtime);
250 vap->va_mtime = dev->si_mtime;
251 fix(dev->si_ctime);
252 vap->va_ctime = dev->si_ctime;
253 vap->va_rdev = dev->si_udev;
254 }
255 vap->va_gen = 0;
256 vap->va_flags = 0;
257 vap->va_nlink = de->de_links;
258 vap->va_fileid = de->de_inode;
259
260 return (error);
261}
262
263static int
264devfs_ioctl(ap)
265 struct vop_ioctl_args /* {
266 struct vnode *a_vp;
267 int a_command;
268 caddr_t a_data;
269 int a_fflag;
270 struct ucred *a_cred;
271 struct thread *a_td;
272 } */ *ap;
273{
274 int error;
275
276 error = devfs_rules_ioctl(ap->a_vp->v_mount, ap->a_command, ap->a_data,
277 ap->a_td);
278 return (error);
279}
280
281static int
282devfs_lookupx(ap)
283 struct vop_lookup_args /* {
284 struct vnode * a_dvp;
285 struct vnode ** a_vpp;
286 struct componentname * a_cnp;
287 } */ *ap;
288{
289 struct componentname *cnp;
290 struct vnode *dvp, **vpp;
291 struct thread *td;
292 struct devfs_dirent *de, *dd;
293 struct devfs_mount *dmp;
294 dev_t cdev, *cpdev;
295 int error, cloned, flags, nameiop;
296 char specname[SPECNAMELEN + 1], *pname;
297
298 cnp = ap->a_cnp;
299 vpp = ap->a_vpp;
300 dvp = ap->a_dvp;
301 pname = cnp->cn_nameptr;
302 td = cnp->cn_thread;
303 flags = cnp->cn_flags;
304 nameiop = cnp->cn_nameiop;
305 dmp = VFSTODEVFS(dvp->v_mount);
306 cloned = 0;
307 dd = dvp->v_data;
308
309 *vpp = NULLVP;
310 cnp->cn_flags &= ~PDIRUNLOCK;
311
312 if ((flags & ISLASTCN) && nameiop == RENAME)
313 return (EOPNOTSUPP);
314
315 if (dvp->v_type != VDIR)
316 return (ENOTDIR);
317
318 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT))
319 return (EIO);
320
321 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td);
322 if (error)
323 return (error);
324
325 if (cnp->cn_namelen == 1 && *pname == '.') {
326 if ((flags & ISLASTCN) && nameiop != LOOKUP)
327 return (EINVAL);
328 *vpp = dvp;
329 VREF(dvp);
330 return (0);
331 }
332
333 if (flags & ISDOTDOT) {
334 if ((flags & ISLASTCN) && nameiop != LOOKUP)
335 return (EINVAL);
336 VOP_UNLOCK(dvp, 0, td);
337 cnp->cn_flags |= PDIRUNLOCK;
338 de = TAILQ_FIRST(&dd->de_dlist); /* "." */
339 de = TAILQ_NEXT(de, de_list); /* ".." */
340 de = de->de_dir;
341 error = devfs_allocv(de, dvp->v_mount, vpp, td);
342 if (error || ((flags & LOCKPARENT) && (flags & ISLASTCN))) {
343 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
344 cnp->cn_flags &= ~PDIRUNLOCK;
345 }
346 return (error);
347 }
348
349 devfs_populate(dmp);
350 dd = dvp->v_data;
351 TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
352 if (cnp->cn_namelen != de->de_dirent->d_namlen)
353 continue;
354 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name,
355 de->de_dirent->d_namlen) != 0)
356 continue;
357 if (de->de_flags & DE_WHITEOUT)
358 goto notfound;
359 goto found;
360 }
361
362 if (nameiop == DELETE)
363 goto notfound;
364
365 /*
366 * OK, we didn't have an entry for the name we were asked for
367 * so we try to see if anybody can create it on demand.
368 */
369 pname = devfs_fqpn(specname, dvp, cnp);
370 if (pname == NULL)
371 goto notfound;
372
373 cdev = NODEV;
374 EVENTHANDLER_INVOKE(dev_clone, pname, strlen(pname), &cdev);
375 if (cdev == NODEV)
376 goto notfound;
377
378 devfs_populate(dmp);
379 dd = dvp->v_data;
380
381 TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
382 cpdev = devfs_itod(de->de_inode);
383 if (cpdev != NULL && cdev == *cpdev)
384 goto found;
385 continue;
386 }
387
388notfound:
389
390 if ((nameiop == CREATE || nameiop == RENAME) &&
391 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) {
392 cnp->cn_flags |= SAVENAME;
393 if (!(flags & LOCKPARENT)) {
394 VOP_UNLOCK(dvp, 0, td);
395 cnp->cn_flags |= PDIRUNLOCK;
396 }
397 return (EJUSTRETURN);
398 }
399 return (ENOENT);
400
401
402found:
403
404 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) {
405 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
406 if (error)
407 return (error);
408 if (*vpp == dvp) {
409 VREF(dvp);
410 *vpp = dvp;
411 return (0);
412 }
413 error = devfs_allocv(de, dvp->v_mount, vpp, td);
414 if (error)
415 return (error);
416 if (!(flags & LOCKPARENT)) {
417 VOP_UNLOCK(dvp, 0, td);
418 cnp->cn_flags |= PDIRUNLOCK;
419 }
420 return (0);
421 }
422 error = devfs_allocv(de, dvp->v_mount, vpp, td);
423 if (error)
424 return (error);
425 if (!(flags & LOCKPARENT) || !(flags & ISLASTCN)) {
426 VOP_UNLOCK(dvp, 0, td);
427 cnp->cn_flags |= PDIRUNLOCK;
428 }
429 return (0);
430}
431
432static int
433devfs_lookup(struct vop_lookup_args *ap)
434{
435 int j;
436 struct devfs_mount *dmp;
437
438 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
439 lockmgr(&dmp->dm_lock, LK_SHARED, 0, curthread);
440 j = devfs_lookupx(ap);
441 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
442 return (j);
443}
444
445static int
446devfs_mknod(struct vop_mknod_args *ap)
447/*
448struct vop_mknod_args {
449 struct vnodeop_desc *a_desc;
450 struct vnode *a_dvp;
451 struct vnode **a_vpp;
452 struct componentname *a_cnp;
453 struct vattr *a_vap;
454};
455*/
456{
457 struct componentname *cnp;
458 struct vnode *dvp, **vpp;
459 struct thread *td;
460 struct devfs_dirent *dd, *de;
461 struct devfs_mount *dmp;
462 int cloned, flags, nameiop;
463 int error;
464
465 dvp = ap->a_dvp;
466 dmp = VFSTODEVFS(dvp->v_mount);
467 lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, curthread);
468
469 cnp = ap->a_cnp;
470 vpp = ap->a_vpp;
471 td = cnp->cn_thread;
472 flags = cnp->cn_flags;
473 nameiop = cnp->cn_nameiop;
474 cloned = 0;
475 dd = dvp->v_data;
476
477 error = ENOENT;
478 TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
479 if (cnp->cn_namelen != de->de_dirent->d_namlen)
480 continue;
481 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name,
482 de->de_dirent->d_namlen) != 0)
483 continue;
484 if (de->de_flags & DE_WHITEOUT)
485 break;
486 goto notfound;
487 }
488 if (de == NULL)
489 goto notfound;
490 de->de_flags &= ~DE_WHITEOUT;
491 error = devfs_allocv(de, dvp->v_mount, vpp, td);
492notfound:
493 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
494 return (error);
495}
496
497
498static int
499devfs_pathconf(ap)
500 struct vop_pathconf_args /* {
501 struct vnode *a_vp;
502 int a_name;
503 int *a_retval;
504 } */ *ap;
505{
506
507 switch (ap->a_name) {
508 case _PC_NAME_MAX:
509 *ap->a_retval = NAME_MAX;
510 return (0);
511 case _PC_PATH_MAX:
512 *ap->a_retval = PATH_MAX;
513 return (0);
514 case _POSIX_MAC_PRESENT:
515#ifdef MAC
516 /*
517 * If MAC is enabled, devfs automatically supports
518 * trivial non-persistant label storage.
519 */
520 *ap->a_retval = 1;
521#else
522 *ap->a_retval = 0;
523#endif /* MAC */
524 return (0);
525 default:
526 return (vop_stdpathconf(ap));
527 }
528 /* NOTREACHED */
529}
530
531static int
532devfs_read(ap)
533 struct vop_read_args /* {
534 struct vnode *a_vp;
535 struct uio *a_uio;
536 int a_ioflag;
537 struct ucred *a_cred;
538 } */ *ap;
539{
540
541 if (ap->a_vp->v_type != VDIR)
542 return (EINVAL);
543 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL));
544}
545
546static int
547devfs_readdir(ap)
548 struct vop_readdir_args /* {
549 struct vnode *a_vp;
550 struct uio *a_uio;
551 struct ucred *a_cred;
552 int *a_eofflag;
553 int *a_ncookies;
554 u_long **a_cookies;
555 } */ *ap;
556{
557 int error;
558 struct uio *uio;
559 struct dirent *dp;
560 struct devfs_dirent *dd;
561 struct devfs_dirent *de;
562 struct devfs_mount *dmp;
563 off_t off, oldoff;
564 int ncookies = 0;
565 u_long *cookiebuf, *cookiep;
566 struct dirent *dps, *dpe;
567
568 if (ap->a_vp->v_type != VDIR)
569 return (ENOTDIR);
570
571 uio = ap->a_uio;
572 if (uio->uio_offset < 0)
573 return (EINVAL);
574
575 dmp = VFSTODEVFS(ap->a_vp->v_mount);
576 lockmgr(&dmp->dm_lock, LK_SHARED, 0, curthread);
577 devfs_populate(dmp);
578 error = 0;
579 de = ap->a_vp->v_data;
580 off = 0;
581 oldoff = uio->uio_offset;
582 TAILQ_FOREACH(dd, &de->de_dlist, de_list) {
583 if (dd->de_flags & DE_WHITEOUT)
584 continue;
585 if (dd->de_dirent->d_type == DT_DIR)
586 de = dd->de_dir;
587 else
588 de = dd;
589 dp = dd->de_dirent;
590 if (dp->d_reclen > uio->uio_resid)
591 break;
592 dp->d_fileno = de->de_inode;
593 if (off >= uio->uio_offset) {
594 ncookies++;
595 error = uiomove((caddr_t)dp, dp->d_reclen, uio);
596 if (error)
597 break;
598 }
599 off += dp->d_reclen;
600 }
601 if( !error && ap->a_ncookies != NULL && ap->a_cookies != NULL ) {
602 MALLOC(cookiebuf, u_long *, ncookies * sizeof(u_long),
603 M_TEMP, M_WAITOK);
604 cookiep = cookiebuf;
605 dps = (struct dirent *)
606 (uio->uio_iov->iov_base - (uio->uio_offset - oldoff));
607 dpe = (struct dirent *) uio->uio_iov->iov_base;
608 for( dp = dps;
609 dp < dpe;
610 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) {
611 oldoff += dp->d_reclen;
612 *cookiep++ = (u_long) oldoff;
613 }
614 *ap->a_ncookies = ncookies;
615 *ap->a_cookies = cookiebuf;
616 }
617 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
618 uio->uio_offset = off;
619 return (error);
620}
621
622static int
623devfs_readlink(ap)
624 struct vop_readlink_args /* {
625 struct vnode *a_vp;
626 struct uio *a_uio;
627 struct ucred *a_cead;
628 } */ *ap;
629{
630 int error;
631 struct devfs_dirent *de;
632
633 de = ap->a_vp->v_data;
634 error = uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio);
635 return (error);
636}
637
638static int
639devfs_reclaim(ap)
640 struct vop_reclaim_args /* {
641 struct vnode *a_vp;
642 } */ *ap;
643{
644 struct vnode *vp = ap->a_vp;
645 struct devfs_dirent *de;
646 int i;
647
648 de = vp->v_data;
649 if (de != NULL)
650 de->de_vnode = NULL;
651 vp->v_data = NULL;
652 if (vp->v_rdev != NODEV && vp->v_rdev != NULL) {
653 i = vcount(vp);
654 if ((vp->v_rdev->si_flags & SI_CHEAPCLONE) && i == 0 &&
655 (vp->v_rdev->si_flags & SI_NAMED))
656 destroy_dev(vp->v_rdev);
657 }
658 return (0);
659}
660
661#ifdef MAC
662static int
663devfs_refreshlabel(ap)
664 struct vop_refreshlabel_args /* {
665 struct vnode *a_vp;
666 struct ucred *a_cred;
667 } */ *ap;
668{
669
670 /* Labels are always in sync. */
671 return (0);
672}
673#endif
674
675static int
676devfs_remove(ap)
677 struct vop_remove_args /* {
678 struct vnode *a_dvp;
679 struct vnode *a_vp;
680 struct componentname *a_cnp;
681 } */ *ap;
682{
683 struct vnode *vp = ap->a_vp;
684 struct devfs_dirent *dd;
685 struct devfs_dirent *de;
686 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount);
687
688 lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, curthread);
689 dd = ap->a_dvp->v_data;
690 de = vp->v_data;
691 if (de->de_dirent->d_type == DT_LNK) {
692 TAILQ_REMOVE(&dd->de_dlist, de, de_list);
693 if (de->de_vnode)
694 de->de_vnode->v_data = NULL;
695#ifdef MAC
696 mac_destroy_devfsdirent(de);
697#endif
698 FREE(de, M_DEVFS);
699 } else {
700 de->de_flags |= DE_WHITEOUT;
701 }
702 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
703 return (0);
704}
705
706/*
707 * Revoke is called on a tty when a terminal session ends. The vnode
708 * is orphaned by setting v_op to deadfs so we need to let go of it
709 * as well so that we create a new one next time around.
710 */
711static int
712devfs_revoke(ap)
713 struct vop_revoke_args /* {
714 struct vnode *a_vp;
715 int a_flags;
716 } */ *ap;
717{
718 struct vnode *vp = ap->a_vp;
719 struct devfs_dirent *de;
720
721 de = vp->v_data;
722 de->de_vnode = NULL;
723 vop_revoke(ap);
724 return (0);
725}
726
727static int
728devfs_setattr(ap)
729 struct vop_setattr_args /* {
730 struct vnode *a_vp;
731 struct vattr *a_vap;
732 struct ucred *a_cred;
733 struct proc *a_p;
734 } */ *ap;
735{
736 struct devfs_dirent *de;
737 struct vattr *vap;
738 struct vnode *vp;
739 int c, error;
740 uid_t uid;
741 gid_t gid;
742
743 vap = ap->a_vap;
744 vp = ap->a_vp;
745 if ((vap->va_type != VNON) ||
746 (vap->va_nlink != VNOVAL) ||
747 (vap->va_fsid != VNOVAL) ||
748 (vap->va_fileid != VNOVAL) ||
749 (vap->va_blocksize != VNOVAL) ||
750 (vap->va_flags != VNOVAL && vap->va_flags != 0) ||
751 (vap->va_rdev != VNOVAL) ||
752 ((int)vap->va_bytes != VNOVAL) ||
753 (vap->va_gen != VNOVAL)) {
754 return (EINVAL);
755 }
756
757 de = vp->v_data;
758 if (vp->v_type == VDIR)
759 de = de->de_dir;
760
761 error = c = 0;
762 if (vap->va_uid == (uid_t)VNOVAL)
763 uid = de->de_uid;
764 else
765 uid = vap->va_uid;
766 if (vap->va_gid == (gid_t)VNOVAL)
767 gid = de->de_gid;
768 else
769 gid = vap->va_gid;
770 if (uid != de->de_uid || gid != de->de_gid) {
771 if (((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid ||
772 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) &&
773 (error = suser_cred(ap->a_td->td_ucred, PRISON_ROOT)) != 0)
774 return (error);
775 de->de_uid = uid;
776 de->de_gid = gid;
777 c = 1;
778 }
779
780 if (vap->va_mode != (mode_t)VNOVAL) {
781 if ((ap->a_cred->cr_uid != de->de_uid) &&
782 (error = suser_cred(ap->a_td->td_ucred, PRISON_ROOT)))
783 return (error);
784 de->de_mode = vap->va_mode;
785 c = 1;
786 }
787
788 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
789 /* See the comment in ufs_vnops::ufs_setattr(). */
790 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, ap->a_td)) &&
791 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
792 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, ap->a_td))))
793 return (error);
794 if (vap->va_atime.tv_sec != VNOVAL) {
795 if (vp->v_type == VCHR)
796 vp->v_rdev->si_atime = vap->va_atime;
797 else
798 de->de_atime = vap->va_atime;
799 }
800 if (vap->va_mtime.tv_sec != VNOVAL) {
801 if (vp->v_type == VCHR)
802 vp->v_rdev->si_mtime = vap->va_mtime;
803 else
804 de->de_mtime = vap->va_mtime;
805 }
806 c = 1;
807 }
808
809 if (c) {
810 if (vp->v_type == VCHR)
811 vfs_timestamp(&vp->v_rdev->si_ctime);
812 else
813 vfs_timestamp(&de->de_mtime);
814 }
815 return (0);
816}
817
818#ifdef MAC
819static int
820devfs_setlabel(ap)
821 struct vop_setlabel_args /* {
822 struct vnode *a_vp;
823 struct mac *a_label;
824 struct ucred *a_cred;
825 struct thread *a_td;
826 } */ *ap;
827{
828 struct vnode *vp;
829 struct devfs_dirent *de;
830
831 vp = ap->a_vp;
832 de = vp->v_data;
833
834 mac_relabel_vnode(ap->a_cred, vp, ap->a_label);
835 mac_update_devfsdirent(de, vp);
836
837 return (0);
838}
839#endif
840
841static int
842devfs_symlink(ap)
843 struct vop_symlink_args /* {
844 struct vnode *a_dvp;
845 struct vnode **a_vpp;
846 struct componentname *a_cnp;
847 struct vattr *a_vap;
848 char *a_target;
849 } */ *ap;
850{
851 int i, error;
852 struct devfs_dirent *dd;
853 struct devfs_dirent *de;
854 struct devfs_mount *dmp;
855
856 error = suser(ap->a_cnp->cn_thread);
857 if (error)
858 return(error);
859 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
860 dd = ap->a_dvp->v_data;
861 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen);
862 de->de_uid = 0;
863 de->de_gid = 0;
864 de->de_mode = 0755;
865 de->de_inode = dmp->dm_inode++;
866 de->de_dirent->d_type = DT_LNK;
867 i = strlen(ap->a_target) + 1;
868 MALLOC(de->de_symlink, char *, i, M_DEVFS, M_WAITOK);
869 bcopy(ap->a_target, de->de_symlink, i);
870 lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, curthread);
|
877 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
878 return (0);
879}
880
881static struct vnodeopv_entry_desc devfs_vnodeop_entries[] = {
882 { &vop_default_desc, (vop_t *) vop_defaultop },
883 { &vop_access_desc, (vop_t *) devfs_access },
884 { &vop_getattr_desc, (vop_t *) devfs_getattr },
885 { &vop_ioctl_desc, (vop_t *) devfs_ioctl },
886 { &vop_islocked_desc, (vop_t *) vop_stdislocked },
887 { &vop_lock_desc, (vop_t *) vop_stdlock },
888 { &vop_lookup_desc, (vop_t *) devfs_lookup },
889 { &vop_mknod_desc, (vop_t *) devfs_mknod },
890 { &vop_pathconf_desc, (vop_t *) devfs_pathconf },
891 { &vop_print_desc, (vop_t *) vop_null },
892 { &vop_read_desc, (vop_t *) devfs_read },
893 { &vop_readdir_desc, (vop_t *) devfs_readdir },
894 { &vop_readlink_desc, (vop_t *) devfs_readlink },
895 { &vop_reclaim_desc, (vop_t *) devfs_reclaim },
896 { &vop_remove_desc, (vop_t *) devfs_remove },
897#ifdef MAC
898 { &vop_refreshlabel_desc, (vop_t *) devfs_refreshlabel },
899#endif
900 { &vop_revoke_desc, (vop_t *) devfs_revoke },
901 { &vop_setattr_desc, (vop_t *) devfs_setattr },
902#ifdef MAC
903 { &vop_setlabel_desc, (vop_t *) devfs_setlabel },
904#endif
905 { &vop_symlink_desc, (vop_t *) devfs_symlink },
906 { &vop_unlock_desc, (vop_t *) vop_stdunlock },
907 { NULL, NULL }
908};
909static struct vnodeopv_desc devfs_vnodeop_opv_desc =
910 { &devfs_vnodeop_p, devfs_vnodeop_entries };
911
912VNODEOP_SET(devfs_vnodeop_opv_desc);
913
914static struct vnodeopv_entry_desc devfs_specop_entries[] = {
915 { &vop_default_desc, (vop_t *) spec_vnoperate },
916 { &vop_access_desc, (vop_t *) devfs_access },
917 { &vop_getattr_desc, (vop_t *) devfs_getattr },
918 { &vop_islocked_desc, (vop_t *) vop_stdislocked },
919 { &vop_lock_desc, (vop_t *) vop_stdlock },
920 { &vop_pathconf_desc, (vop_t *) devfs_pathconf },
921 { &vop_print_desc, (vop_t *) vop_null },
922 { &vop_reclaim_desc, (vop_t *) devfs_reclaim },
923#ifdef MAC
924 { &vop_refreshlabel_desc, (vop_t *) devfs_refreshlabel },
925#endif
926 { &vop_remove_desc, (vop_t *) devfs_remove },
927 { &vop_revoke_desc, (vop_t *) devfs_revoke },
928 { &vop_setattr_desc, (vop_t *) devfs_setattr },
929#ifdef MAC
930 { &vop_setlabel_desc, (vop_t *) devfs_setlabel },
931#endif
932 { &vop_unlock_desc, (vop_t *) vop_stdunlock },
933 { NULL, NULL }
934};
935static struct vnodeopv_desc devfs_specop_opv_desc =
936 { &devfs_specop_p, devfs_specop_entries };
937
938VNODEOP_SET(devfs_specop_opv_desc);
939#endif
| 876 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
877 return (0);
878}
879
880static struct vnodeopv_entry_desc devfs_vnodeop_entries[] = {
881 { &vop_default_desc, (vop_t *) vop_defaultop },
882 { &vop_access_desc, (vop_t *) devfs_access },
883 { &vop_getattr_desc, (vop_t *) devfs_getattr },
884 { &vop_ioctl_desc, (vop_t *) devfs_ioctl },
885 { &vop_islocked_desc, (vop_t *) vop_stdislocked },
886 { &vop_lock_desc, (vop_t *) vop_stdlock },
887 { &vop_lookup_desc, (vop_t *) devfs_lookup },
888 { &vop_mknod_desc, (vop_t *) devfs_mknod },
889 { &vop_pathconf_desc, (vop_t *) devfs_pathconf },
890 { &vop_print_desc, (vop_t *) vop_null },
891 { &vop_read_desc, (vop_t *) devfs_read },
892 { &vop_readdir_desc, (vop_t *) devfs_readdir },
893 { &vop_readlink_desc, (vop_t *) devfs_readlink },
894 { &vop_reclaim_desc, (vop_t *) devfs_reclaim },
895 { &vop_remove_desc, (vop_t *) devfs_remove },
896#ifdef MAC
897 { &vop_refreshlabel_desc, (vop_t *) devfs_refreshlabel },
898#endif
899 { &vop_revoke_desc, (vop_t *) devfs_revoke },
900 { &vop_setattr_desc, (vop_t *) devfs_setattr },
901#ifdef MAC
902 { &vop_setlabel_desc, (vop_t *) devfs_setlabel },
903#endif
904 { &vop_symlink_desc, (vop_t *) devfs_symlink },
905 { &vop_unlock_desc, (vop_t *) vop_stdunlock },
906 { NULL, NULL }
907};
908static struct vnodeopv_desc devfs_vnodeop_opv_desc =
909 { &devfs_vnodeop_p, devfs_vnodeop_entries };
910
911VNODEOP_SET(devfs_vnodeop_opv_desc);
912
913static struct vnodeopv_entry_desc devfs_specop_entries[] = {
914 { &vop_default_desc, (vop_t *) spec_vnoperate },
915 { &vop_access_desc, (vop_t *) devfs_access },
916 { &vop_getattr_desc, (vop_t *) devfs_getattr },
917 { &vop_islocked_desc, (vop_t *) vop_stdislocked },
918 { &vop_lock_desc, (vop_t *) vop_stdlock },
919 { &vop_pathconf_desc, (vop_t *) devfs_pathconf },
920 { &vop_print_desc, (vop_t *) vop_null },
921 { &vop_reclaim_desc, (vop_t *) devfs_reclaim },
922#ifdef MAC
923 { &vop_refreshlabel_desc, (vop_t *) devfs_refreshlabel },
924#endif
925 { &vop_remove_desc, (vop_t *) devfs_remove },
926 { &vop_revoke_desc, (vop_t *) devfs_revoke },
927 { &vop_setattr_desc, (vop_t *) devfs_setattr },
928#ifdef MAC
929 { &vop_setlabel_desc, (vop_t *) devfs_setlabel },
930#endif
931 { &vop_unlock_desc, (vop_t *) vop_stdunlock },
932 { NULL, NULL }
933};
934static struct vnodeopv_desc devfs_specop_opv_desc =
935 { &devfs_specop_p, devfs_specop_entries };
936
937VNODEOP_SET(devfs_specop_opv_desc);
938#endif
|