2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2000-2004
5 * Poul-Henning Kamp. All rights reserved.
6 * Copyright (c) 1989, 1992-1993, 1995
7 * The Regents of the University of California. All rights reserved.
9 * This code is derived from software donated to Berkeley by
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#)kernfs_vnops.c 8.15 (Berkeley) 5/21/95
34 * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vnops.c 1.43
44 #include <sys/param.h>
45 #include <sys/systm.h>
47 #include <sys/dirent.h>
48 #include <sys/eventhandler.h>
49 #include <sys/fcntl.h>
51 #include <sys/filedesc.h>
52 #include <sys/filio.h>
54 #include <sys/kernel.h>
55 #include <sys/limits.h>
57 #include <sys/malloc.h>
59 #include <sys/mount.h>
60 #include <sys/namei.h>
65 #include <sys/sysctl.h>
67 #include <sys/ttycom.h>
68 #include <sys/unistd.h>
69 #include <sys/vnode.h>
71 static struct vop_vector devfs_vnodeops;
72 static struct vop_vector devfs_specops;
73 static struct fileops devfs_ops_f;
75 #include <fs/devfs/devfs.h>
76 #include <fs/devfs/devfs_int.h>
78 #include <security/mac/mac_framework.h>
81 #include <vm/vm_extern.h>
82 #include <vm/vm_object.h>
84 static MALLOC_DEFINE(M_CDEVPDATA, "DEVFSP", "Metainfo for cdev-fp data");
86 struct mtx devfs_de_interlock;
87 MTX_SYSINIT(devfs_de_interlock, &devfs_de_interlock, "devfs interlock", MTX_DEF);
88 struct sx clone_drain_lock;
89 SX_SYSINIT(clone_drain_lock, &clone_drain_lock, "clone events drain lock");
90 struct mtx cdevpriv_mtx;
91 MTX_SYSINIT(cdevpriv_mtx, &cdevpriv_mtx, "cdevpriv lock", MTX_DEF);
93 SYSCTL_DECL(_vfs_devfs);
95 static int devfs_dotimes;
96 SYSCTL_INT(_vfs_devfs, OID_AUTO, dotimes, CTLFLAG_RW,
97 &devfs_dotimes, 0, "Update timestamps on DEVFS with default precision");
100 * Update devfs node timestamp. Note that updates are unlocked and
101 * stat(2) could see partially updated times.
104 devfs_timestamp(struct timespec *tsp)
112 if (tsp->tv_sec != ts) {
120 devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp,
123 *dswp = devvn_refthread(fp->f_vnode, devp, ref);
124 if (*dswp == NULL || *devp != fp->f_data) {
126 dev_relthread(*devp, *ref);
129 KASSERT((*devp)->si_refcount > 0,
130 ("devfs: un-referenced struct cdev *(%s)", devtoname(*devp)));
133 curthread->td_fpop = fp;
138 devfs_get_cdevpriv(void **datap)
141 struct cdev_privdata *p;
144 fp = curthread->td_fpop;
150 *datap = p->cdpd_data;
157 devfs_set_cdevpriv(void *priv, d_priv_dtor_t *priv_dtr)
160 struct cdev_priv *cdp;
161 struct cdev_privdata *p;
164 fp = curthread->td_fpop;
167 cdp = cdev2priv((struct cdev *)fp->f_data);
168 p = malloc(sizeof(struct cdev_privdata), M_CDEVPDATA, M_WAITOK);
170 p->cdpd_dtr = priv_dtr;
172 mtx_lock(&cdevpriv_mtx);
173 if (fp->f_cdevpriv == NULL) {
174 LIST_INSERT_HEAD(&cdp->cdp_fdpriv, p, cdpd_list);
176 mtx_unlock(&cdevpriv_mtx);
179 mtx_unlock(&cdevpriv_mtx);
180 free(p, M_CDEVPDATA);
187 devfs_destroy_cdevpriv(struct cdev_privdata *p)
190 mtx_assert(&cdevpriv_mtx, MA_OWNED);
191 KASSERT(p->cdpd_fp->f_cdevpriv == p,
192 ("devfs_destoy_cdevpriv %p != %p", p->cdpd_fp->f_cdevpriv, p));
193 p->cdpd_fp->f_cdevpriv = NULL;
194 LIST_REMOVE(p, cdpd_list);
195 mtx_unlock(&cdevpriv_mtx);
196 (p->cdpd_dtr)(p->cdpd_data);
197 free(p, M_CDEVPDATA);
201 devfs_fpdrop(struct file *fp)
203 struct cdev_privdata *p;
205 mtx_lock(&cdevpriv_mtx);
206 if ((p = fp->f_cdevpriv) == NULL) {
207 mtx_unlock(&cdevpriv_mtx);
210 devfs_destroy_cdevpriv(p);
214 devfs_clear_cdevpriv(void)
218 fp = curthread->td_fpop;
225 devfs_usecount_add(struct vnode *vp)
227 struct devfs_dirent *de;
230 mtx_lock(&devfs_de_interlock);
232 VNPASS(vp->v_type == VCHR || vp->v_type == VBAD, vp);
233 if (VN_IS_DOOMED(vp)) {
245 mtx_unlock(&devfs_de_interlock);
249 devfs_usecount_subl(struct vnode *vp)
251 struct devfs_dirent *de;
254 mtx_assert(&devfs_de_interlock, MA_OWNED);
255 ASSERT_VI_LOCKED(vp, __func__);
256 VNPASS(vp->v_type == VCHR || vp->v_type == VBAD, vp);
263 MPASS(de->de_usecount == 0);
266 if (dev->si_usecount < de->de_usecount)
267 panic("%s: si_usecount underflow for dev %p "
268 "(has %ld, dirent has %d)\n",
269 __func__, dev, dev->si_usecount, de->de_usecount);
270 if (VN_IS_DOOMED(vp)) {
271 dev->si_usecount -= de->de_usecount;
274 if (de->de_usecount == 0)
275 panic("%s: de_usecount underflow for dev %p\n",
283 devfs_usecount_sub(struct vnode *vp)
286 mtx_lock(&devfs_de_interlock);
288 devfs_usecount_subl(vp);
290 mtx_unlock(&devfs_de_interlock);
294 devfs_usecountl(struct vnode *vp)
297 VNPASS(vp->v_type == VCHR, vp);
298 mtx_assert(&devfs_de_interlock, MA_OWNED);
299 ASSERT_VI_LOCKED(vp, __func__);
300 return (vp->v_rdev->si_usecount);
304 devfs_usecount(struct vnode *vp)
308 VNPASS(vp->v_type == VCHR, vp);
309 mtx_lock(&devfs_de_interlock);
311 count = devfs_usecountl(vp);
313 mtx_unlock(&devfs_de_interlock);
318 devfs_ctty_ref(struct vnode *vp)
322 devfs_usecount_add(vp);
326 devfs_ctty_unref(struct vnode *vp)
329 devfs_usecount_sub(vp);
334 * On success devfs_populate_vp() returns with dmp->dm_lock held.
337 devfs_populate_vp(struct vnode *vp)
339 struct devfs_dirent *de;
340 struct devfs_mount *dmp;
343 ASSERT_VOP_LOCKED(vp, "devfs_populate_vp");
345 dmp = VFSTODEVFS(vp->v_mount);
346 if (!devfs_populate_needed(dmp)) {
347 sx_xlock(&dmp->dm_lock);
351 locked = VOP_ISLOCKED(vp);
353 sx_xlock(&dmp->dm_lock);
356 /* Can't call devfs_populate() with the vnode lock held. */
360 sx_xunlock(&dmp->dm_lock);
361 vn_lock(vp, locked | LK_RETRY);
362 sx_xlock(&dmp->dm_lock);
363 if (DEVFS_DMP_DROP(dmp)) {
364 sx_xunlock(&dmp->dm_lock);
365 devfs_unmount_final(dmp);
369 if (VN_IS_DOOMED(vp)) {
370 sx_xunlock(&dmp->dm_lock);
375 ("devfs_populate_vp: vp->v_data == NULL but vnode not doomed"));
376 if ((de->de_flags & DE_DOOMED) != 0) {
377 sx_xunlock(&dmp->dm_lock);
385 devfs_vptocnp(struct vop_vptocnp_args *ap)
387 struct vnode *vp = ap->a_vp;
388 struct vnode **dvp = ap->a_vpp;
389 struct devfs_mount *dmp;
390 char *buf = ap->a_buf;
391 size_t *buflen = ap->a_buflen;
392 struct devfs_dirent *dd, *de;
395 dmp = VFSTODEVFS(vp->v_mount);
397 error = devfs_populate_vp(vp);
401 if (vp->v_type != VCHR && vp->v_type != VDIR) {
407 if (vp->v_type == VDIR && dd == dmp->dm_rootdir) {
414 i -= dd->de_dirent->d_namlen;
419 bcopy(dd->de_dirent->d_name, buf + i, dd->de_dirent->d_namlen);
421 de = devfs_parent_dirent(dd);
426 mtx_lock(&devfs_de_interlock);
430 mtx_unlock(&devfs_de_interlock);
436 mtx_unlock(&devfs_de_interlock);
440 sx_xunlock(&dmp->dm_lock);
445 * Construct the fully qualified path name relative to the mountpoint.
446 * If a NULL cnp is provided, no '/' is appended to the resulting path.
449 devfs_fqpn(char *buf, struct devfs_mount *dmp, struct devfs_dirent *dd,
450 struct componentname *cnp)
453 struct devfs_dirent *de;
455 sx_assert(&dmp->dm_lock, SA_LOCKED);
460 i -= cnp->cn_namelen;
464 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen);
466 while (de != dmp->dm_rootdir) {
467 if (cnp != NULL || i < SPECNAMELEN) {
473 i -= de->de_dirent->d_namlen;
476 bcopy(de->de_dirent->d_name, buf + i,
477 de->de_dirent->d_namlen);
478 de = devfs_parent_dirent(de);
486 devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp,
487 struct devfs_dirent *de)
492 if (de->de_flags & DE_DOOMED)
494 if (DEVFS_DE_DROP(de)) {
495 KASSERT(not_found == 1, ("DEVFS de dropped but not doomed"));
496 devfs_dirent_free(de);
498 if (DEVFS_DMP_DROP(dmp)) {
499 KASSERT(not_found == 1,
500 ("DEVFS mount struct freed before dirent"));
502 sx_xunlock(&dmp->dm_lock);
503 devfs_unmount_final(dmp);
505 if (not_found == 1 || (drop_dm_lock && not_found != 2))
506 sx_unlock(&dmp->dm_lock);
511 devfs_insmntque_dtr(struct vnode *vp, void *arg)
513 struct devfs_dirent *de;
515 de = (struct devfs_dirent *)arg;
516 mtx_lock(&devfs_de_interlock);
519 mtx_unlock(&devfs_de_interlock);
525 * devfs_allocv shall be entered with dmp->dm_lock held, and it drops
529 devfs_allocv(struct devfs_dirent *de, struct mount *mp, int lockmode,
535 struct devfs_mount *dmp;
539 dmp = VFSTODEVFS(mp);
540 if (de->de_flags & DE_DOOMED) {
541 sx_xunlock(&dmp->dm_lock);
547 mtx_lock(&devfs_de_interlock);
551 mtx_unlock(&devfs_de_interlock);
552 sx_xunlock(&dmp->dm_lock);
553 vget_finish(vp, lockmode | LK_RETRY, vs);
554 sx_xlock(&dmp->dm_lock);
555 if (devfs_allocv_drop_refs(0, dmp, de)) {
559 else if (VN_IS_DOOMED(vp)) {
560 mtx_lock(&devfs_de_interlock);
561 if (de->de_vnode == vp) {
565 mtx_unlock(&devfs_de_interlock);
569 sx_xunlock(&dmp->dm_lock);
573 mtx_unlock(&devfs_de_interlock);
574 if (de->de_dirent->d_type == DT_CHR) {
575 if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) {
576 devfs_allocv_drop_refs(1, dmp, de);
579 dev = &de->de_cdp->cdp_c;
583 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp);
585 devfs_allocv_drop_refs(1, dmp, de);
586 printf("devfs_allocv: failed to allocate new vnode\n");
590 if (de->de_dirent->d_type == DT_CHR) {
595 /* XXX: v_rdev should be protect by vnode lock */
597 VNPASS(vp->v_usecount == 1, vp);
598 /* Special casing of ttys for deadfs. Probably redundant. */
600 if (dsw != NULL && (dsw->d_flags & D_TTY) != 0)
601 vp->v_vflag |= VV_ISTTY;
604 if ((dev->si_flags & SI_ETERNAL) != 0)
605 vp->v_vflag |= VV_ETERNALDEV;
606 vp->v_op = &devfs_specops;
607 } else if (de->de_dirent->d_type == DT_DIR) {
609 } else if (de->de_dirent->d_type == DT_LNK) {
614 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS);
616 mtx_lock(&devfs_de_interlock);
619 mtx_unlock(&devfs_de_interlock);
620 error = insmntque1(vp, mp, devfs_insmntque_dtr, de);
622 (void) devfs_allocv_drop_refs(1, dmp, de);
625 if (devfs_allocv_drop_refs(0, dmp, de)) {
630 mac_devfs_vnode_associate(mp, de, vp);
632 sx_xunlock(&dmp->dm_lock);
638 devfs_access(struct vop_access_args *ap)
640 struct vnode *vp = ap->a_vp;
641 struct devfs_dirent *de;
646 if (vp->v_type == VDIR)
649 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid,
650 ap->a_accmode, ap->a_cred);
655 p = ap->a_td->td_proc;
656 /* We do, however, allow access to the controlling terminal */
658 if (!(p->p_flag & P_CONTROLT)) {
662 if (p->p_session->s_ttydp == de->de_cdp)
668 _Static_assert(((FMASK | FCNTLFLAGS) & (FLASTCLOSE | FREVOKE)) == 0,
669 "devfs-only flag reuse failed");
672 devfs_close(struct vop_close_args *ap)
674 struct vnode *vp = ap->a_vp, *oldvp;
675 struct thread *td = ap->a_td;
677 struct cdev *dev = vp->v_rdev;
679 struct devfs_dirent *de = vp->v_data;
680 int dflags, error, ref, vp_locked;
683 * XXX: Don't call d_close() if we were called because of
684 * XXX: insmntque1() failure.
686 if (vp->v_data == NULL)
690 * Hack: a tty device that is a controlling terminal
691 * has a reference from the session structure.
692 * We cannot easily tell that a character device is
693 * a controlling terminal, unless it is the closing
694 * process' controlling terminal. In that case,
695 * if the reference count is 2 (this last descriptor
696 * plus the session), release the reference from the session.
698 if (de->de_usecount == 2 && td != NULL) {
701 if (vp == p->p_session->s_ttyvp) {
704 sx_xlock(&proctree_lock);
705 if (vp == p->p_session->s_ttyvp) {
706 SESS_LOCK(p->p_session);
707 mtx_lock(&devfs_de_interlock);
709 if (devfs_usecountl(vp) == 2 && !VN_IS_DOOMED(vp)) {
710 p->p_session->s_ttyvp = NULL;
711 p->p_session->s_ttydp = NULL;
715 mtx_unlock(&devfs_de_interlock);
716 SESS_UNLOCK(p->p_session);
718 sx_xunlock(&proctree_lock);
720 devfs_ctty_unref(oldvp);
725 * We do not want to really close the device if it
726 * is still in use unless we are trying to close it
727 * forcibly. Since every use (buffer, vnode, swap, cmap)
728 * holds a reference to the vnode, and because we mark
729 * any other vnodes that alias this device, when the
730 * sum of the reference counts on all the aliased
731 * vnodes descends to one, we are on last close.
733 dsw = dev_refthread(dev, &ref);
737 mtx_lock(&devfs_de_interlock);
739 if (devfs_usecountl(vp) == 1)
740 dflags |= FLASTCLOSE;
741 devfs_usecount_subl(vp);
742 mtx_unlock(&devfs_de_interlock);
743 if (VN_IS_DOOMED(vp)) {
745 dflags |= FREVOKE | FNONBLOCK;
746 } else if (dsw->d_flags & D_TRACKCLOSE) {
747 /* Keep device updated on status. */
748 } else if ((dflags & FLASTCLOSE) == 0) {
750 dev_relthread(dev, ref);
755 vp_locked = VOP_ISLOCKED(vp);
757 KASSERT(dev->si_refcount > 0,
758 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev)));
759 error = dsw->d_close(dev, ap->a_fflag | dflags, S_IFCHR, td);
760 dev_relthread(dev, ref);
761 vn_lock(vp, vp_locked | LK_RETRY);
767 devfs_close_f(struct file *fp, struct thread *td)
773 * NB: td may be NULL if this descriptor is closed due to
774 * garbage collection from a closed UNIX domain socket.
776 fpop = curthread->td_fpop;
777 curthread->td_fpop = fp;
778 error = vnops.fo_close(fp, td);
779 curthread->td_fpop = fpop;
782 * The f_cdevpriv cannot be assigned non-NULL value while we
783 * are destroying the file.
785 if (fp->f_cdevpriv != NULL)
791 devfs_getattr(struct vop_getattr_args *ap)
793 struct vnode *vp = ap->a_vp;
794 struct vattr *vap = ap->a_vap;
795 struct devfs_dirent *de;
796 struct devfs_mount *dmp;
798 struct timeval boottime;
801 error = devfs_populate_vp(vp);
805 dmp = VFSTODEVFS(vp->v_mount);
806 sx_xunlock(&dmp->dm_lock);
809 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp));
810 if (vp->v_type == VDIR) {
813 ("Null dir dirent in devfs_getattr vp=%p", vp));
815 vap->va_uid = de->de_uid;
816 vap->va_gid = de->de_gid;
817 vap->va_mode = de->de_mode;
818 if (vp->v_type == VLNK)
819 vap->va_size = strlen(de->de_symlink);
820 else if (vp->v_type == VDIR)
821 vap->va_size = vap->va_bytes = DEV_BSIZE;
824 if (vp->v_type != VDIR)
826 vap->va_blocksize = DEV_BSIZE;
827 vap->va_type = vp->v_type;
829 getboottime(&boottime);
832 if ((aa).tv_sec <= 3600) { \
833 (aa).tv_sec = boottime.tv_sec; \
834 (aa).tv_nsec = boottime.tv_usec * 1000; \
838 if (vp->v_type != VCHR) {
840 vap->va_atime = de->de_atime;
842 vap->va_mtime = de->de_mtime;
844 vap->va_ctime = de->de_ctime;
848 vap->va_atime = dev->si_atime;
850 vap->va_mtime = dev->si_mtime;
852 vap->va_ctime = dev->si_ctime;
854 vap->va_rdev = cdev2priv(dev)->cdp_inode;
859 vap->va_nlink = de->de_links;
860 vap->va_fileid = de->de_inode;
867 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td)
874 error = vnops.fo_ioctl(fp, com, data, cred, td);
880 fiodgname_buf_get_ptr(void *fgnp, u_long com)
883 struct fiodgname_arg fgn;
884 #ifdef COMPAT_FREEBSD32
885 struct fiodgname_arg32 fgn32;
892 return (fgnup->fgn.buf);
893 #ifdef COMPAT_FREEBSD32
895 return ((void *)(uintptr_t)fgnup->fgn32.buf);
898 panic("Unhandled ioctl command %ld", com);
903 devfs_ioctl(struct vop_ioctl_args *ap)
905 struct fiodgname_arg *fgn;
906 struct vnode *vpold, *vp;
909 struct session *sess;
919 dsw = devvn_refthread(vp, &dev, &ref);
922 KASSERT(dev->si_refcount > 0,
923 ("devfs: un-referenced struct cdev *(%s)", devtoname(dev)));
927 *(int *)ap->a_data = dsw->d_flags & D_TYPEMASK;
931 #ifdef COMPAT_FREEBSD32
940 error = copyout(p, fiodgname_buf_get_ptr(fgn, com), i);
943 error = dsw->d_ioctl(dev, com, ap->a_data, ap->a_fflag, td);
946 dev_relthread(dev, ref);
947 if (error == ENOIOCTL)
950 if (error == 0 && com == TIOCSCTTY) {
952 * Do nothing if reassigning same control tty, or if the
953 * control tty has already disappeared. If it disappeared,
954 * it's because we were racing with TIOCNOTTY. TIOCNOTTY
955 * already took care of releasing the old vnode and we have
956 * nothing left to do.
958 sx_slock(&proctree_lock);
959 sess = td->td_proc->p_session;
960 if (sess->s_ttyvp == vp || sess->s_ttyp == NULL) {
961 sx_sunlock(&proctree_lock);
967 vpold = sess->s_ttyvp;
969 sess->s_ttydp = cdev2priv(dev);
972 sx_sunlock(&proctree_lock);
974 /* Get rid of reference to old control tty */
976 devfs_ctty_unref(vpold);
983 devfs_kqfilter_f(struct file *fp, struct knote *kn)
993 error = devfs_fp_check(fp, &dev, &dsw, &ref);
996 error = dsw->d_kqfilter(dev, kn);
998 dev_relthread(dev, ref);
1003 devfs_prison_check(struct devfs_dirent *de, struct thread *td)
1005 struct cdev_priv *cdp;
1013 dcr = cdp->cdp_c.si_cred;
1017 error = prison_check(td->td_ucred, dcr);
1020 /* We do, however, allow access to the controlling terminal */
1023 if (!(p->p_flag & P_CONTROLT)) {
1027 if (p->p_session->s_ttydp == cdp)
1034 devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock)
1036 struct componentname *cnp;
1037 struct vnode *dvp, **vpp;
1039 struct devfs_dirent *de, *dd;
1040 struct devfs_dirent **dde;
1041 struct devfs_mount *dmp;
1044 int error, flags, nameiop, dvplocked;
1045 char specname[SPECNAMELEN + 1], *pname;
1051 pname = cnp->cn_nameptr;
1052 flags = cnp->cn_flags;
1053 nameiop = cnp->cn_nameiop;
1055 dmp = VFSTODEVFS(mp);
1059 if ((flags & ISLASTCN) && nameiop == RENAME)
1060 return (EOPNOTSUPP);
1062 if (dvp->v_type != VDIR)
1065 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT))
1068 error = vn_dir_check_exec(dvp, cnp);
1072 if (cnp->cn_namelen == 1 && *pname == '.') {
1073 if ((flags & ISLASTCN) && nameiop != LOOKUP)
1080 if (flags & ISDOTDOT) {
1081 if ((flags & ISLASTCN) && nameiop != LOOKUP)
1083 de = devfs_parent_dirent(dd);
1086 dvplocked = VOP_ISLOCKED(dvp);
1088 error = devfs_allocv(de, mp, cnp->cn_lkflags & LK_TYPE_MASK,
1091 vn_lock(dvp, dvplocked | LK_RETRY);
1096 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen, 0);
1097 while (de == NULL) { /* While(...) so we can use break */
1099 if (nameiop == DELETE)
1103 * OK, we didn't have an entry for the name we were asked for
1104 * so we try to see if anybody can create it on demand.
1106 pname = devfs_fqpn(specname, dmp, dd, cnp);
1111 DEVFS_DMP_HOLD(dmp);
1112 sx_xunlock(&dmp->dm_lock);
1113 sx_slock(&clone_drain_lock);
1114 EVENTHANDLER_INVOKE(dev_clone,
1115 td->td_ucred, pname, strlen(pname), &cdev);
1116 sx_sunlock(&clone_drain_lock);
1119 sx_xlock(&dmp->dm_lock);
1120 else if (devfs_populate_vp(dvp) != 0) {
1122 sx_xlock(&dmp->dm_lock);
1123 if (DEVFS_DMP_DROP(dmp)) {
1124 sx_xunlock(&dmp->dm_lock);
1125 devfs_unmount_final(dmp);
1127 sx_xunlock(&dmp->dm_lock);
1131 if (DEVFS_DMP_DROP(dmp)) {
1133 sx_xunlock(&dmp->dm_lock);
1134 devfs_unmount_final(dmp);
1144 dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx];
1145 if (dde != NULL && *dde != NULL)
1152 if (de == NULL || de->de_flags & DE_WHITEOUT) {
1153 if ((nameiop == CREATE || nameiop == RENAME) &&
1154 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) {
1155 cnp->cn_flags |= SAVENAME;
1156 return (EJUSTRETURN);
1161 if (devfs_prison_check(de, td))
1164 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) {
1165 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
1174 error = devfs_allocv(de, mp, cnp->cn_lkflags & LK_TYPE_MASK, vpp);
1180 devfs_lookup(struct vop_lookup_args *ap)
1183 struct devfs_mount *dmp;
1186 if (devfs_populate_vp(ap->a_dvp) != 0)
1189 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
1191 j = devfs_lookupx(ap, &dm_unlock);
1193 sx_xunlock(&dmp->dm_lock);
1198 devfs_mknod(struct vop_mknod_args *ap)
1200 struct componentname *cnp;
1201 struct vnode *dvp, **vpp;
1202 struct devfs_dirent *dd, *de;
1203 struct devfs_mount *dmp;
1207 * The only type of node we should be creating here is a
1208 * character device, for anything else return EOPNOTSUPP.
1210 if (ap->a_vap->va_type != VCHR)
1211 return (EOPNOTSUPP);
1213 dmp = VFSTODEVFS(dvp->v_mount);
1220 sx_xlock(&dmp->dm_lock);
1221 TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
1222 if (cnp->cn_namelen != de->de_dirent->d_namlen)
1224 if (de->de_dirent->d_type == DT_CHR &&
1225 (de->de_cdp->cdp_flags & CDP_ACTIVE) == 0)
1227 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name,
1228 de->de_dirent->d_namlen) != 0)
1230 if (de->de_flags & DE_WHITEOUT)
1236 de->de_flags &= ~DE_WHITEOUT;
1237 error = devfs_allocv(de, dvp->v_mount, LK_EXCLUSIVE, vpp);
1240 sx_xunlock(&dmp->dm_lock);
1246 devfs_open(struct vop_open_args *ap)
1248 struct thread *td = ap->a_td;
1249 struct vnode *vp = ap->a_vp;
1250 struct cdev *dev = vp->v_rdev;
1251 struct file *fp = ap->a_fp;
1252 int error, ref, vlocked;
1256 if (vp->v_type == VBLK)
1262 /* Make this field valid before any I/O in d_open. */
1263 if (dev->si_iosize_max == 0)
1264 dev->si_iosize_max = DFLTPHYS;
1266 dsw = dev_refthread(dev, &ref);
1269 if (fp == NULL && dsw->d_fdopen != NULL) {
1270 dev_relthread(dev, ref);
1274 if (vp->v_type == VCHR)
1275 devfs_usecount_add(vp);
1277 vlocked = VOP_ISLOCKED(vp);
1286 if (dsw->d_fdopen != NULL)
1287 error = dsw->d_fdopen(dev, ap->a_mode, td, fp);
1289 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td);
1290 /* Clean up any cdevpriv upon error. */
1292 devfs_clear_cdevpriv();
1295 vn_lock(vp, vlocked | LK_RETRY);
1296 if (error != 0 && vp->v_type == VCHR)
1297 devfs_usecount_sub(vp);
1299 dev_relthread(dev, ref);
1301 if (error == ERESTART)
1306 #if 0 /* /dev/console */
1307 KASSERT(fp != NULL, ("Could not vnode bypass device on NULL fp"));
1312 if (fp->f_ops == &badfileops)
1313 finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f);
1318 devfs_pathconf(struct vop_pathconf_args *ap)
1321 switch (ap->a_name) {
1322 case _PC_FILESIZEBITS:
1326 *ap->a_retval = NAME_MAX;
1329 *ap->a_retval = INT_MAX;
1331 case _PC_SYMLINK_MAX:
1332 *ap->a_retval = MAXPATHLEN;
1335 if (ap->a_vp->v_vflag & VV_ISTTY) {
1336 *ap->a_retval = MAX_CANON;
1341 if (ap->a_vp->v_vflag & VV_ISTTY) {
1342 *ap->a_retval = MAX_INPUT;
1347 if (ap->a_vp->v_vflag & VV_ISTTY) {
1348 *ap->a_retval = _POSIX_VDISABLE;
1352 case _PC_MAC_PRESENT:
1355 * If MAC is enabled, devfs automatically supports
1356 * trivial non-persistant label storage.
1363 case _PC_CHOWN_RESTRICTED:
1367 return (vop_stdpathconf(ap));
1374 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td)
1382 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1384 error = vnops.fo_poll(fp, events, cred, td);
1387 error = dsw->d_poll(dev, events, td);
1389 dev_relthread(dev, ref);
1394 * Print out the contents of a special device vnode.
1397 devfs_print(struct vop_print_args *ap)
1400 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev));
1405 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred,
1406 int flags, struct thread *td)
1409 int ioflag, error, ref;
1414 if (uio->uio_resid > DEVFS_IOSIZE_MAX)
1417 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1419 error = vnops.fo_read(fp, uio, cred, flags, td);
1422 resid = uio->uio_resid;
1423 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT);
1424 if (ioflag & O_DIRECT)
1425 ioflag |= IO_DIRECT;
1427 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK);
1428 error = dsw->d_read(dev, uio, ioflag);
1429 if (uio->uio_resid != resid || (error == 0 && resid != 0))
1430 devfs_timestamp(&dev->si_atime);
1432 dev_relthread(dev, ref);
1434 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_R);
1439 devfs_readdir(struct vop_readdir_args *ap)
1444 struct devfs_dirent *dd;
1445 struct devfs_dirent *de;
1446 struct devfs_mount *dmp;
1448 int *tmp_ncookies = NULL;
1450 if (ap->a_vp->v_type != VDIR)
1454 if (uio->uio_offset < 0)
1458 * XXX: This is a temporary hack to get around this filesystem not
1459 * supporting cookies. We store the location of the ncookies pointer
1460 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent()
1461 * and set the number of cookies to 0. We then set the pointer to
1462 * NULL so that vfs_read_dirent doesn't try to call realloc() on
1463 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies
1464 * pointer to its original location before returning to the caller.
1466 if (ap->a_ncookies != NULL) {
1467 tmp_ncookies = ap->a_ncookies;
1468 *ap->a_ncookies = 0;
1469 ap->a_ncookies = NULL;
1472 dmp = VFSTODEVFS(ap->a_vp->v_mount);
1473 if (devfs_populate_vp(ap->a_vp) != 0) {
1474 if (tmp_ncookies != NULL)
1475 ap->a_ncookies = tmp_ncookies;
1479 de = ap->a_vp->v_data;
1481 TAILQ_FOREACH(dd, &de->de_dlist, de_list) {
1482 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__));
1483 if (dd->de_flags & (DE_COVERED | DE_WHITEOUT))
1485 if (devfs_prison_check(dd, uio->uio_td))
1487 if (dd->de_dirent->d_type == DT_DIR)
1492 MPASS(dp->d_reclen == GENERIC_DIRSIZ(dp));
1493 if (dp->d_reclen > uio->uio_resid)
1495 dp->d_fileno = de->de_inode;
1496 /* NOTE: d_off is the offset for the *next* entry. */
1497 dp->d_off = off + dp->d_reclen;
1498 if (off >= uio->uio_offset) {
1499 error = vfs_read_dirent(ap, dp, off);
1503 off += dp->d_reclen;
1505 sx_xunlock(&dmp->dm_lock);
1506 uio->uio_offset = off;
1509 * Restore ap->a_ncookies if it wasn't originally NULL in the first
1512 if (tmp_ncookies != NULL)
1513 ap->a_ncookies = tmp_ncookies;
1519 devfs_readlink(struct vop_readlink_args *ap)
1521 struct devfs_dirent *de;
1523 de = ap->a_vp->v_data;
1524 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio));
1528 devfs_reclaiml(struct vnode *vp)
1530 struct devfs_dirent *de;
1532 mtx_assert(&devfs_de_interlock, MA_OWNED);
1535 MPASS(de->de_usecount == 0);
1536 de->de_vnode = NULL;
1542 devfs_reclaim(struct vop_reclaim_args *ap)
1547 mtx_lock(&devfs_de_interlock);
1549 mtx_unlock(&devfs_de_interlock);
1554 devfs_reclaim_vchr(struct vop_reclaim_args *ap)
1560 MPASS(vp->v_type == VCHR);
1562 mtx_lock(&devfs_de_interlock);
1564 devfs_usecount_subl(vp);
1566 mtx_unlock(&devfs_de_interlock);
1578 devfs_remove(struct vop_remove_args *ap)
1580 struct vnode *dvp = ap->a_dvp;
1581 struct vnode *vp = ap->a_vp;
1582 struct devfs_dirent *dd;
1583 struct devfs_dirent *de, *de_covered;
1584 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount);
1586 ASSERT_VOP_ELOCKED(dvp, "devfs_remove");
1587 ASSERT_VOP_ELOCKED(vp, "devfs_remove");
1589 sx_xlock(&dmp->dm_lock);
1590 dd = ap->a_dvp->v_data;
1592 if (de->de_cdp == NULL) {
1593 TAILQ_REMOVE(&dd->de_dlist, de, de_list);
1594 if (de->de_dirent->d_type == DT_LNK) {
1595 de_covered = devfs_find(dd, de->de_dirent->d_name,
1596 de->de_dirent->d_namlen, 0);
1597 if (de_covered != NULL)
1598 de_covered->de_flags &= ~DE_COVERED;
1600 /* We need to unlock dvp because devfs_delete() may lock it. */
1604 devfs_delete(dmp, de, 0);
1605 sx_xunlock(&dmp->dm_lock);
1607 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1608 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1610 de->de_flags |= DE_WHITEOUT;
1611 sx_xunlock(&dmp->dm_lock);
1617 * Revoke is called on a tty when a terminal session ends. The vnode
1618 * is orphaned by setting v_op to deadfs so we need to let go of it
1619 * as well so that we create a new one next time around.
1623 devfs_revoke(struct vop_revoke_args *ap)
1625 struct vnode *vp = ap->a_vp, *vp2;
1627 struct cdev_priv *cdp;
1628 struct devfs_dirent *de;
1632 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL"));
1635 cdp = cdev2priv(dev);
1648 mtx_lock(&devfs_de_interlock);
1651 for (i = 0; i <= cdp->cdp_maxdirent; i++) {
1652 de = cdp->cdp_dirents[i];
1659 vs = vget_prep(vp2);
1660 mtx_unlock(&devfs_de_interlock);
1661 if (vget_finish(vp2, LK_EXCLUSIVE, vs) != 0)
1674 mtx_unlock(&devfs_de_interlock);
1679 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) {
1680 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list);
1682 dev_rel(&cdp->cdp_c);
1686 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1691 devfs_rioctl(struct vop_ioctl_args *ap)
1694 struct devfs_mount *dmp;
1698 vn_lock(vp, LK_SHARED | LK_RETRY);
1699 if (VN_IS_DOOMED(vp)) {
1703 dmp = VFSTODEVFS(vp->v_mount);
1704 sx_xlock(&dmp->dm_lock);
1706 DEVFS_DMP_HOLD(dmp);
1707 devfs_populate(dmp);
1708 if (DEVFS_DMP_DROP(dmp)) {
1709 sx_xunlock(&dmp->dm_lock);
1710 devfs_unmount_final(dmp);
1713 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td);
1714 sx_xunlock(&dmp->dm_lock);
1719 devfs_rread(struct vop_read_args *ap)
1722 if (ap->a_vp->v_type != VDIR)
1724 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL));
1728 devfs_setattr(struct vop_setattr_args *ap)
1730 struct devfs_dirent *de;
1741 if ((vap->va_type != VNON) ||
1742 (vap->va_nlink != VNOVAL) ||
1743 (vap->va_fsid != VNOVAL) ||
1744 (vap->va_fileid != VNOVAL) ||
1745 (vap->va_blocksize != VNOVAL) ||
1746 (vap->va_flags != VNOVAL && vap->va_flags != 0) ||
1747 (vap->va_rdev != VNOVAL) ||
1748 ((int)vap->va_bytes != VNOVAL) ||
1749 (vap->va_gen != VNOVAL)) {
1753 error = devfs_populate_vp(vp);
1758 if (vp->v_type == VDIR)
1762 if (vap->va_uid == (uid_t)VNOVAL)
1766 if (vap->va_gid == (gid_t)VNOVAL)
1770 if (uid != de->de_uid || gid != de->de_gid) {
1771 if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid ||
1772 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) {
1773 error = priv_check(td, PRIV_VFS_CHOWN);
1782 if (vap->va_mode != (mode_t)VNOVAL) {
1783 if (ap->a_cred->cr_uid != de->de_uid) {
1784 error = priv_check(td, PRIV_VFS_ADMIN);
1788 de->de_mode = vap->va_mode;
1792 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
1793 error = vn_utimes_perm(vp, vap, ap->a_cred, td);
1796 if (vap->va_atime.tv_sec != VNOVAL) {
1797 if (vp->v_type == VCHR)
1798 vp->v_rdev->si_atime = vap->va_atime;
1800 de->de_atime = vap->va_atime;
1802 if (vap->va_mtime.tv_sec != VNOVAL) {
1803 if (vp->v_type == VCHR)
1804 vp->v_rdev->si_mtime = vap->va_mtime;
1806 de->de_mtime = vap->va_mtime;
1812 if (vp->v_type == VCHR)
1813 vfs_timestamp(&vp->v_rdev->si_ctime);
1815 vfs_timestamp(&de->de_mtime);
1819 sx_xunlock(&VFSTODEVFS(vp->v_mount)->dm_lock);
1825 devfs_setlabel(struct vop_setlabel_args *ap)
1828 struct devfs_dirent *de;
1833 mac_vnode_relabel(ap->a_cred, vp, ap->a_label);
1834 mac_devfs_update(vp->v_mount, de, vp);
1841 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred)
1844 return (vnops.fo_stat(fp, sb, cred));
1848 devfs_symlink(struct vop_symlink_args *ap)
1851 struct devfs_dirent *dd;
1852 struct devfs_dirent *de, *de_covered, *de_dotdot;
1853 struct devfs_mount *dmp;
1855 error = priv_check(curthread, PRIV_DEVFS_SYMLINK);
1858 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
1859 if (devfs_populate_vp(ap->a_dvp) != 0)
1862 dd = ap->a_dvp->v_data;
1863 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen);
1864 de->de_flags = DE_USER;
1868 de->de_inode = alloc_unr(devfs_inos);
1870 de->de_dirent->d_type = DT_LNK;
1871 i = strlen(ap->a_target) + 1;
1872 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK);
1873 bcopy(ap->a_target, de->de_symlink, i);
1875 mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de);
1877 de_covered = devfs_find(dd, de->de_dirent->d_name,
1878 de->de_dirent->d_namlen, 0);
1879 if (de_covered != NULL) {
1880 if ((de_covered->de_flags & DE_USER) != 0) {
1881 devfs_delete(dmp, de, DEVFS_DEL_NORECURSE);
1882 sx_xunlock(&dmp->dm_lock);
1885 KASSERT((de_covered->de_flags & DE_COVERED) == 0,
1886 ("devfs_symlink: entry %p already covered", de_covered));
1887 de_covered->de_flags |= DE_COVERED;
1890 de_dotdot = TAILQ_FIRST(&dd->de_dlist); /* "." */
1891 de_dotdot = TAILQ_NEXT(de_dotdot, de_list); /* ".." */
1892 TAILQ_INSERT_AFTER(&dd->de_dlist, de_dotdot, de, de_list);
1893 devfs_dir_ref_de(dmp, dd);
1894 devfs_rules_apply(dmp, de);
1896 return (devfs_allocv(de, ap->a_dvp->v_mount, LK_EXCLUSIVE, ap->a_vpp));
1900 devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td)
1903 return (vnops.fo_truncate(fp, length, cred, td));
1907 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred,
1908 int flags, struct thread *td)
1911 int error, ioflag, ref;
1916 if (uio->uio_resid > DEVFS_IOSIZE_MAX)
1919 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1921 error = vnops.fo_write(fp, uio, cred, flags, td);
1924 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td));
1925 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC);
1926 if (ioflag & O_DIRECT)
1927 ioflag |= IO_DIRECT;
1928 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK);
1930 resid = uio->uio_resid;
1932 error = dsw->d_write(dev, uio, ioflag);
1933 if (uio->uio_resid != resid || (error == 0 && resid != 0)) {
1934 devfs_timestamp(&dev->si_ctime);
1935 dev->si_mtime = dev->si_ctime;
1938 dev_relthread(dev, ref);
1940 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_W);
1945 devfs_mmap_f(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size,
1946 vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff,
1961 * Ensure that file and memory protections are
1965 if (mp != NULL && (mp->mnt_flag & MNT_NOEXEC) != 0) {
1966 maxprot = VM_PROT_NONE;
1967 if ((prot & VM_PROT_EXECUTE) != 0)
1970 maxprot = VM_PROT_EXECUTE;
1971 if ((fp->f_flag & FREAD) != 0)
1972 maxprot |= VM_PROT_READ;
1973 else if ((prot & VM_PROT_READ) != 0)
1977 * If we are sharing potential changes via MAP_SHARED and we
1978 * are trying to get write permission although we opened it
1979 * without asking for it, bail out.
1981 * Note that most character devices always share mappings.
1982 * The one exception is that D_MMAP_ANON devices
1983 * (i.e. /dev/zero) permit private writable mappings.
1985 * Rely on vm_mmap_cdev() to fail invalid MAP_PRIVATE requests
1986 * as well as updating maxprot to permit writing for
1987 * D_MMAP_ANON devices rather than doing that here.
1989 if ((flags & MAP_SHARED) != 0) {
1990 if ((fp->f_flag & FWRITE) != 0)
1991 maxprot |= VM_PROT_WRITE;
1992 else if ((prot & VM_PROT_WRITE) != 0)
1995 maxprot &= cap_maxprot;
1998 error = devfs_fp_check(fp, &dev, &dsw, &ref);
2002 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, dev, dsw, &foff,
2005 dev_relthread(dev, ref);
2009 error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object,
2012 vm_object_deallocate(object);
2017 dev2udev(struct cdev *x)
2021 return (cdev2priv(x)->cdp_inode);
2024 static struct fileops devfs_ops_f = {
2025 .fo_read = devfs_read_f,
2026 .fo_write = devfs_write_f,
2027 .fo_truncate = devfs_truncate_f,
2028 .fo_ioctl = devfs_ioctl_f,
2029 .fo_poll = devfs_poll_f,
2030 .fo_kqfilter = devfs_kqfilter_f,
2031 .fo_stat = devfs_stat_f,
2032 .fo_close = devfs_close_f,
2033 .fo_chmod = vn_chmod,
2034 .fo_chown = vn_chown,
2035 .fo_sendfile = vn_sendfile,
2037 .fo_fill_kinfo = vn_fill_kinfo,
2038 .fo_mmap = devfs_mmap_f,
2039 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE
2042 /* Vops for non-CHR vnodes in /dev. */
2043 static struct vop_vector devfs_vnodeops = {
2044 .vop_default = &default_vnodeops,
2046 .vop_access = devfs_access,
2047 .vop_getattr = devfs_getattr,
2048 .vop_ioctl = devfs_rioctl,
2049 .vop_lookup = devfs_lookup,
2050 .vop_mknod = devfs_mknod,
2051 .vop_pathconf = devfs_pathconf,
2052 .vop_read = devfs_rread,
2053 .vop_readdir = devfs_readdir,
2054 .vop_readlink = devfs_readlink,
2055 .vop_reclaim = devfs_reclaim,
2056 .vop_remove = devfs_remove,
2057 .vop_revoke = devfs_revoke,
2058 .vop_setattr = devfs_setattr,
2060 .vop_setlabel = devfs_setlabel,
2062 .vop_symlink = devfs_symlink,
2063 .vop_vptocnp = devfs_vptocnp,
2064 .vop_lock1 = vop_lock,
2065 .vop_unlock = vop_unlock,
2066 .vop_islocked = vop_islocked,
2067 .vop_add_writecount = vop_stdadd_writecount_nomsync,
2069 VFS_VOP_VECTOR_REGISTER(devfs_vnodeops);
2071 /* Vops for VCHR vnodes in /dev. */
2072 static struct vop_vector devfs_specops = {
2073 .vop_default = &default_vnodeops,
2075 .vop_access = devfs_access,
2076 .vop_bmap = VOP_PANIC,
2077 .vop_close = devfs_close,
2078 .vop_create = VOP_PANIC,
2079 .vop_fsync = vop_stdfsync,
2080 .vop_getattr = devfs_getattr,
2081 .vop_ioctl = devfs_ioctl,
2082 .vop_link = VOP_PANIC,
2083 .vop_mkdir = VOP_PANIC,
2084 .vop_mknod = VOP_PANIC,
2085 .vop_open = devfs_open,
2086 .vop_pathconf = devfs_pathconf,
2087 .vop_poll = dead_poll,
2088 .vop_print = devfs_print,
2089 .vop_read = dead_read,
2090 .vop_readdir = VOP_PANIC,
2091 .vop_readlink = VOP_PANIC,
2092 .vop_reallocblks = VOP_PANIC,
2093 .vop_reclaim = devfs_reclaim_vchr,
2094 .vop_remove = devfs_remove,
2095 .vop_rename = VOP_PANIC,
2096 .vop_revoke = devfs_revoke,
2097 .vop_rmdir = VOP_PANIC,
2098 .vop_setattr = devfs_setattr,
2100 .vop_setlabel = devfs_setlabel,
2102 .vop_strategy = VOP_PANIC,
2103 .vop_symlink = VOP_PANIC,
2104 .vop_vptocnp = devfs_vptocnp,
2105 .vop_write = dead_write,
2106 .vop_lock1 = vop_lock,
2107 .vop_unlock = vop_unlock,
2108 .vop_islocked = vop_islocked,
2109 .vop_add_writecount = vop_stdadd_writecount_nomsync,
2111 VFS_VOP_VECTOR_REGISTER(devfs_specops);
2114 * Our calling convention to the device drivers used to be that we passed
2115 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_
2116 * flags instead since that's what open(), close() and ioctl() takes and
2117 * we don't really want vnode.h in device drivers.
2118 * We solved the source compatibility by redefining some vnode flags to
2119 * be the same as the fcntl ones and by sending down the bitwise OR of
2120 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody
2121 * pulls the rug out under this.
2123 CTASSERT(O_NONBLOCK == IO_NDELAY);
2124 CTASSERT(O_FSYNC == IO_SYNC);