2 * SPDX-License-Identifier: BSD-2-Clause
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
42 #include <sys/param.h>
43 #include <sys/systm.h>
45 #include <sys/dirent.h>
46 #include <sys/eventhandler.h>
47 #include <sys/fcntl.h>
49 #include <sys/filedesc.h>
50 #include <sys/filio.h>
52 #include <sys/kernel.h>
53 #include <sys/limits.h>
55 #include <sys/malloc.h>
57 #include <sys/mount.h>
58 #include <sys/namei.h>
63 #include <sys/sysctl.h>
65 #include <sys/ttycom.h>
66 #include <sys/unistd.h>
67 #include <sys/vnode.h>
69 static struct vop_vector devfs_vnodeops;
70 static struct vop_vector devfs_specops;
71 static struct fileops devfs_ops_f;
73 #include <fs/devfs/devfs.h>
74 #include <fs/devfs/devfs_int.h>
76 #include <security/mac/mac_framework.h>
79 #include <vm/vm_extern.h>
80 #include <vm/vm_object.h>
82 static MALLOC_DEFINE(M_CDEVPDATA, "DEVFSP", "Metainfo for cdev-fp data");
84 struct mtx devfs_de_interlock;
85 MTX_SYSINIT(devfs_de_interlock, &devfs_de_interlock, "devfs interlock", MTX_DEF);
86 struct mtx cdevpriv_mtx;
87 MTX_SYSINIT(cdevpriv_mtx, &cdevpriv_mtx, "cdevpriv lock", MTX_DEF);
89 SYSCTL_DECL(_vfs_devfs);
91 static int devfs_dotimes;
92 SYSCTL_INT(_vfs_devfs, OID_AUTO, dotimes, CTLFLAG_RW,
93 &devfs_dotimes, 0, "Update timestamps on DEVFS with default precision");
96 * Update devfs node timestamp. Note that updates are unlocked and
97 * stat(2) could see partially updated times.
100 devfs_timestamp(struct timespec *tsp)
108 if (tsp->tv_sec != ts) {
116 devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp,
119 *dswp = devvn_refthread(fp->f_vnode, devp, ref);
120 if (*dswp == NULL || *devp != fp->f_data) {
122 dev_relthread(*devp, *ref);
125 KASSERT((*devp)->si_refcount > 0,
126 ("devfs: un-referenced struct cdev *(%s)", devtoname(*devp)));
129 curthread->td_fpop = fp;
134 devfs_get_cdevpriv(void **datap)
137 struct cdev_privdata *p;
140 fp = curthread->td_fpop;
146 *datap = p->cdpd_data;
153 devfs_set_cdevpriv(void *priv, d_priv_dtor_t *priv_dtr)
156 struct cdev_priv *cdp;
157 struct cdev_privdata *p;
160 fp = curthread->td_fpop;
163 cdp = cdev2priv((struct cdev *)fp->f_data);
164 p = malloc(sizeof(struct cdev_privdata), M_CDEVPDATA, M_WAITOK);
166 p->cdpd_dtr = priv_dtr;
168 mtx_lock(&cdevpriv_mtx);
169 if (fp->f_cdevpriv == NULL) {
170 LIST_INSERT_HEAD(&cdp->cdp_fdpriv, p, cdpd_list);
172 mtx_unlock(&cdevpriv_mtx);
175 mtx_unlock(&cdevpriv_mtx);
176 free(p, M_CDEVPDATA);
183 devfs_destroy_cdevpriv(struct cdev_privdata *p)
186 mtx_assert(&cdevpriv_mtx, MA_OWNED);
187 KASSERT(p->cdpd_fp->f_cdevpriv == p,
188 ("devfs_destoy_cdevpriv %p != %p", p->cdpd_fp->f_cdevpriv, p));
189 p->cdpd_fp->f_cdevpriv = NULL;
190 LIST_REMOVE(p, cdpd_list);
191 mtx_unlock(&cdevpriv_mtx);
192 (p->cdpd_dtr)(p->cdpd_data);
193 free(p, M_CDEVPDATA);
197 devfs_fpdrop(struct file *fp)
199 struct cdev_privdata *p;
201 mtx_lock(&cdevpriv_mtx);
202 if ((p = fp->f_cdevpriv) == NULL) {
203 mtx_unlock(&cdevpriv_mtx);
206 devfs_destroy_cdevpriv(p);
210 devfs_clear_cdevpriv(void)
214 fp = curthread->td_fpop;
221 devfs_usecount_add(struct vnode *vp)
223 struct devfs_dirent *de;
226 mtx_lock(&devfs_de_interlock);
228 VNPASS(vp->v_type == VCHR || vp->v_type == VBAD, vp);
229 if (VN_IS_DOOMED(vp)) {
241 mtx_unlock(&devfs_de_interlock);
245 devfs_usecount_subl(struct vnode *vp)
247 struct devfs_dirent *de;
250 mtx_assert(&devfs_de_interlock, MA_OWNED);
251 ASSERT_VI_LOCKED(vp, __func__);
252 VNPASS(vp->v_type == VCHR || vp->v_type == VBAD, vp);
259 MPASS(de->de_usecount == 0);
262 if (dev->si_usecount < de->de_usecount)
263 panic("%s: si_usecount underflow for dev %p "
264 "(has %ld, dirent has %d)\n",
265 __func__, dev, dev->si_usecount, de->de_usecount);
266 if (VN_IS_DOOMED(vp)) {
267 dev->si_usecount -= de->de_usecount;
270 if (de->de_usecount == 0)
271 panic("%s: de_usecount underflow for dev %p\n",
279 devfs_usecount_sub(struct vnode *vp)
282 mtx_lock(&devfs_de_interlock);
284 devfs_usecount_subl(vp);
286 mtx_unlock(&devfs_de_interlock);
290 devfs_usecountl(struct vnode *vp)
293 VNPASS(vp->v_type == VCHR, vp);
294 mtx_assert(&devfs_de_interlock, MA_OWNED);
295 ASSERT_VI_LOCKED(vp, __func__);
296 return (vp->v_rdev->si_usecount);
300 devfs_usecount(struct vnode *vp)
304 VNPASS(vp->v_type == VCHR, vp);
305 mtx_lock(&devfs_de_interlock);
307 count = devfs_usecountl(vp);
309 mtx_unlock(&devfs_de_interlock);
314 devfs_ctty_ref(struct vnode *vp)
318 devfs_usecount_add(vp);
322 devfs_ctty_unref(struct vnode *vp)
325 devfs_usecount_sub(vp);
330 * On success devfs_populate_vp() returns with dmp->dm_lock held.
333 devfs_populate_vp(struct vnode *vp)
335 struct devfs_dirent *de;
336 struct devfs_mount *dmp;
339 ASSERT_VOP_LOCKED(vp, "devfs_populate_vp");
341 dmp = VFSTODEVFS(vp->v_mount);
342 if (!devfs_populate_needed(dmp)) {
343 sx_xlock(&dmp->dm_lock);
347 locked = VOP_ISLOCKED(vp);
349 sx_xlock(&dmp->dm_lock);
352 /* Can't call devfs_populate() with the vnode lock held. */
356 sx_xunlock(&dmp->dm_lock);
357 vn_lock(vp, locked | LK_RETRY);
358 sx_xlock(&dmp->dm_lock);
359 if (DEVFS_DMP_DROP(dmp)) {
360 sx_xunlock(&dmp->dm_lock);
361 devfs_unmount_final(dmp);
365 if (VN_IS_DOOMED(vp)) {
366 sx_xunlock(&dmp->dm_lock);
371 ("devfs_populate_vp: vp->v_data == NULL but vnode not doomed"));
372 if ((de->de_flags & DE_DOOMED) != 0) {
373 sx_xunlock(&dmp->dm_lock);
381 devfs_vptocnp(struct vop_vptocnp_args *ap)
383 struct vnode *vp = ap->a_vp;
384 struct vnode **dvp = ap->a_vpp;
385 struct devfs_mount *dmp;
386 char *buf = ap->a_buf;
387 size_t *buflen = ap->a_buflen;
388 struct devfs_dirent *dd, *de;
391 dmp = VFSTODEVFS(vp->v_mount);
393 error = devfs_populate_vp(vp);
397 if (vp->v_type != VCHR && vp->v_type != VDIR) {
403 if (vp->v_type == VDIR && dd == dmp->dm_rootdir) {
410 i -= dd->de_dirent->d_namlen;
415 bcopy(dd->de_dirent->d_name, buf + i, dd->de_dirent->d_namlen);
417 de = devfs_parent_dirent(dd);
422 mtx_lock(&devfs_de_interlock);
426 mtx_unlock(&devfs_de_interlock);
432 mtx_unlock(&devfs_de_interlock);
436 sx_xunlock(&dmp->dm_lock);
441 * Construct the fully qualified path name relative to the mountpoint.
442 * If a NULL cnp is provided, no '/' is appended to the resulting path.
445 devfs_fqpn(char *buf, struct devfs_mount *dmp, struct devfs_dirent *dd,
446 struct componentname *cnp)
449 struct devfs_dirent *de;
451 sx_assert(&dmp->dm_lock, SA_LOCKED);
456 i -= cnp->cn_namelen;
460 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen);
462 while (de != dmp->dm_rootdir) {
463 if (cnp != NULL || i < SPECNAMELEN) {
469 i -= de->de_dirent->d_namlen;
472 bcopy(de->de_dirent->d_name, buf + i,
473 de->de_dirent->d_namlen);
474 de = devfs_parent_dirent(de);
482 devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp,
483 struct devfs_dirent *de)
488 if (de->de_flags & DE_DOOMED)
490 if (DEVFS_DE_DROP(de)) {
491 KASSERT(not_found == 1, ("DEVFS de dropped but not doomed"));
492 devfs_dirent_free(de);
494 if (DEVFS_DMP_DROP(dmp)) {
495 KASSERT(not_found == 1,
496 ("DEVFS mount struct freed before dirent"));
498 sx_xunlock(&dmp->dm_lock);
499 devfs_unmount_final(dmp);
501 if (not_found == 1 || (drop_dm_lock && not_found != 2))
502 sx_unlock(&dmp->dm_lock);
507 * devfs_allocv shall be entered with dmp->dm_lock held, and it drops
511 devfs_allocv(struct devfs_dirent *de, struct mount *mp, int lockmode,
517 struct devfs_mount *dmp;
521 dmp = VFSTODEVFS(mp);
522 if (de->de_flags & DE_DOOMED) {
523 sx_xunlock(&dmp->dm_lock);
529 mtx_lock(&devfs_de_interlock);
533 mtx_unlock(&devfs_de_interlock);
534 sx_xunlock(&dmp->dm_lock);
535 vget_finish(vp, lockmode | LK_RETRY, vs);
536 sx_xlock(&dmp->dm_lock);
537 if (devfs_allocv_drop_refs(0, dmp, de)) {
541 else if (VN_IS_DOOMED(vp)) {
542 mtx_lock(&devfs_de_interlock);
543 if (de->de_vnode == vp) {
547 mtx_unlock(&devfs_de_interlock);
551 sx_xunlock(&dmp->dm_lock);
555 mtx_unlock(&devfs_de_interlock);
556 if (de->de_dirent->d_type == DT_CHR) {
557 if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) {
558 devfs_allocv_drop_refs(1, dmp, de);
561 dev = &de->de_cdp->cdp_c;
565 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp);
567 devfs_allocv_drop_refs(1, dmp, de);
568 printf("devfs_allocv: failed to allocate new vnode\n");
572 if (de->de_dirent->d_type == DT_CHR) {
577 /* XXX: v_rdev should be protect by vnode lock */
579 VNPASS(vp->v_usecount == 1, vp);
580 /* Special casing of ttys for deadfs. Probably redundant. */
582 if (dsw != NULL && (dsw->d_flags & D_TTY) != 0)
583 vp->v_vflag |= VV_ISTTY;
586 if ((dev->si_flags & SI_ETERNAL) != 0)
587 vp->v_vflag |= VV_ETERNALDEV;
588 vp->v_op = &devfs_specops;
589 } else if (de->de_dirent->d_type == DT_DIR) {
591 } else if (de->de_dirent->d_type == DT_LNK) {
596 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS);
598 mtx_lock(&devfs_de_interlock);
601 mtx_unlock(&devfs_de_interlock);
602 error = insmntque1(vp, mp);
604 mtx_lock(&devfs_de_interlock);
607 mtx_unlock(&devfs_de_interlock);
610 (void) devfs_allocv_drop_refs(1, dmp, de);
613 if (devfs_allocv_drop_refs(0, dmp, de)) {
619 mac_devfs_vnode_associate(mp, de, vp);
621 sx_xunlock(&dmp->dm_lock);
622 vn_set_state(vp, VSTATE_CONSTRUCTED);
628 devfs_access(struct vop_access_args *ap)
630 struct vnode *vp = ap->a_vp;
631 struct devfs_dirent *de;
636 if (vp->v_type == VDIR)
639 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid,
640 ap->a_accmode, ap->a_cred);
645 p = ap->a_td->td_proc;
646 /* We do, however, allow access to the controlling terminal */
648 if (!(p->p_flag & P_CONTROLT)) {
652 if (p->p_session->s_ttydp == de->de_cdp)
658 _Static_assert(((FMASK | FCNTLFLAGS) & (FLASTCLOSE | FREVOKE)) == 0,
659 "devfs-only flag reuse failed");
662 devfs_close(struct vop_close_args *ap)
664 struct vnode *vp = ap->a_vp, *oldvp;
665 struct thread *td = ap->a_td;
667 struct cdev *dev = vp->v_rdev;
669 struct devfs_dirent *de = vp->v_data;
670 int dflags, error, ref, vp_locked;
673 * XXX: Don't call d_close() if we were called because of
674 * XXX: insmntque() failure.
676 if (vp->v_data == NULL)
680 * Hack: a tty device that is a controlling terminal
681 * has a reference from the session structure.
682 * We cannot easily tell that a character device is
683 * a controlling terminal, unless it is the closing
684 * process' controlling terminal. In that case,
685 * if the reference count is 2 (this last descriptor
686 * plus the session), release the reference from the session.
688 if (de->de_usecount == 2 && td != NULL) {
691 if (vp == p->p_session->s_ttyvp) {
694 sx_xlock(&proctree_lock);
695 if (vp == p->p_session->s_ttyvp) {
696 SESS_LOCK(p->p_session);
697 mtx_lock(&devfs_de_interlock);
699 if (devfs_usecountl(vp) == 2 && !VN_IS_DOOMED(vp)) {
700 p->p_session->s_ttyvp = NULL;
701 p->p_session->s_ttydp = NULL;
705 mtx_unlock(&devfs_de_interlock);
706 SESS_UNLOCK(p->p_session);
708 sx_xunlock(&proctree_lock);
710 devfs_ctty_unref(oldvp);
715 * We do not want to really close the device if it
716 * is still in use unless we are trying to close it
717 * forcibly. Since every use (buffer, vnode, swap, cmap)
718 * holds a reference to the vnode, and because we mark
719 * any other vnodes that alias this device, when the
720 * sum of the reference counts on all the aliased
721 * vnodes descends to one, we are on last close.
723 dsw = dev_refthread(dev, &ref);
727 mtx_lock(&devfs_de_interlock);
729 if (devfs_usecountl(vp) == 1)
730 dflags |= FLASTCLOSE;
731 devfs_usecount_subl(vp);
732 mtx_unlock(&devfs_de_interlock);
733 if (VN_IS_DOOMED(vp)) {
735 dflags |= FREVOKE | FNONBLOCK;
736 } else if (dsw->d_flags & D_TRACKCLOSE) {
737 /* Keep device updated on status. */
738 } else if ((dflags & FLASTCLOSE) == 0) {
740 dev_relthread(dev, ref);
745 vp_locked = VOP_ISLOCKED(vp);
747 KASSERT(dev->si_refcount > 0,
748 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev)));
749 error = dsw->d_close(dev, ap->a_fflag | dflags, S_IFCHR, td);
750 dev_relthread(dev, ref);
751 vn_lock(vp, vp_locked | LK_RETRY);
757 devfs_close_f(struct file *fp, struct thread *td)
763 * NB: td may be NULL if this descriptor is closed due to
764 * garbage collection from a closed UNIX domain socket.
766 fpop = curthread->td_fpop;
767 curthread->td_fpop = fp;
768 error = vnops.fo_close(fp, td);
769 curthread->td_fpop = fpop;
772 * The f_cdevpriv cannot be assigned non-NULL value while we
773 * are destroying the file.
775 if (fp->f_cdevpriv != NULL)
781 devfs_getattr(struct vop_getattr_args *ap)
783 struct vnode *vp = ap->a_vp;
784 struct vattr *vap = ap->a_vap;
785 struct devfs_dirent *de;
786 struct devfs_mount *dmp;
788 struct timeval boottime;
791 error = devfs_populate_vp(vp);
795 dmp = VFSTODEVFS(vp->v_mount);
796 sx_xunlock(&dmp->dm_lock);
799 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp));
800 if (vp->v_type == VDIR) {
803 ("Null dir dirent in devfs_getattr vp=%p", vp));
805 vap->va_uid = de->de_uid;
806 vap->va_gid = de->de_gid;
807 vap->va_mode = de->de_mode;
808 if (vp->v_type == VLNK)
809 vap->va_size = strlen(de->de_symlink);
810 else if (vp->v_type == VDIR)
811 vap->va_size = vap->va_bytes = DEV_BSIZE;
814 if (vp->v_type != VDIR)
816 vap->va_blocksize = DEV_BSIZE;
817 vap->va_type = vp->v_type;
819 getboottime(&boottime);
822 if ((aa).tv_sec <= 3600) { \
823 (aa).tv_sec = boottime.tv_sec; \
824 (aa).tv_nsec = boottime.tv_usec * 1000; \
828 if (vp->v_type != VCHR) {
830 vap->va_atime = de->de_atime;
832 vap->va_mtime = de->de_mtime;
834 vap->va_ctime = de->de_ctime;
838 vap->va_atime = dev->si_atime;
840 vap->va_mtime = dev->si_mtime;
842 vap->va_ctime = dev->si_ctime;
844 vap->va_rdev = cdev2priv(dev)->cdp_inode;
849 vap->va_nlink = de->de_links;
850 vap->va_fileid = de->de_inode;
857 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td)
864 error = vnops.fo_ioctl(fp, com, data, cred, td);
870 fiodgname_buf_get_ptr(void *fgnp, u_long com)
873 struct fiodgname_arg fgn;
874 #ifdef COMPAT_FREEBSD32
875 struct fiodgname_arg32 fgn32;
882 return (fgnup->fgn.buf);
883 #ifdef COMPAT_FREEBSD32
885 return ((void *)(uintptr_t)fgnup->fgn32.buf);
888 panic("Unhandled ioctl command %ld", com);
893 devfs_ioctl(struct vop_ioctl_args *ap)
895 struct fiodgname_arg *fgn;
896 struct vnode *vpold, *vp;
899 struct session *sess;
909 dsw = devvn_refthread(vp, &dev, &ref);
912 KASSERT(dev->si_refcount > 0,
913 ("devfs: un-referenced struct cdev *(%s)", devtoname(dev)));
917 *(int *)ap->a_data = dsw->d_flags & D_TYPEMASK;
921 #ifdef COMPAT_FREEBSD32
930 error = copyout(p, fiodgname_buf_get_ptr(fgn, com), i);
933 error = dsw->d_ioctl(dev, com, ap->a_data, ap->a_fflag, td);
936 dev_relthread(dev, ref);
937 if (error == ENOIOCTL)
940 if (error == 0 && com == TIOCSCTTY) {
942 * Do nothing if reassigning same control tty, or if the
943 * control tty has already disappeared. If it disappeared,
944 * it's because we were racing with TIOCNOTTY. TIOCNOTTY
945 * already took care of releasing the old vnode and we have
946 * nothing left to do.
948 sx_slock(&proctree_lock);
949 sess = td->td_proc->p_session;
950 if (sess->s_ttyvp == vp || sess->s_ttyp == NULL) {
951 sx_sunlock(&proctree_lock);
957 vpold = sess->s_ttyvp;
959 sess->s_ttydp = cdev2priv(dev);
962 sx_sunlock(&proctree_lock);
964 /* Get rid of reference to old control tty */
966 devfs_ctty_unref(vpold);
973 devfs_kqfilter_f(struct file *fp, struct knote *kn)
983 error = devfs_fp_check(fp, &dev, &dsw, &ref);
986 error = dsw->d_kqfilter(dev, kn);
988 dev_relthread(dev, ref);
993 devfs_prison_check(struct devfs_dirent *de, struct thread *td)
995 struct cdev_priv *cdp;
1003 dcr = cdp->cdp_c.si_cred;
1007 error = prison_check(td->td_ucred, dcr);
1010 /* We do, however, allow access to the controlling terminal */
1013 if (!(p->p_flag & P_CONTROLT)) {
1017 if (p->p_session->s_ttydp == cdp)
1024 devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock)
1026 struct componentname *cnp;
1027 struct vnode *dvp, **vpp;
1029 struct devfs_dirent *de, *dd;
1030 struct devfs_dirent **dde;
1031 struct devfs_mount *dmp;
1034 int error, flags, nameiop, dvplocked;
1035 char specname[SPECNAMELEN + 1], *pname;
1041 pname = cnp->cn_nameptr;
1042 flags = cnp->cn_flags;
1043 nameiop = cnp->cn_nameiop;
1045 dmp = VFSTODEVFS(mp);
1049 if ((flags & ISLASTCN) && nameiop == RENAME)
1050 return (EOPNOTSUPP);
1052 if (dvp->v_type != VDIR)
1055 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT))
1058 error = vn_dir_check_exec(dvp, cnp);
1062 if (cnp->cn_namelen == 1 && *pname == '.') {
1063 if ((flags & ISLASTCN) && nameiop != LOOKUP)
1070 if (flags & ISDOTDOT) {
1071 if ((flags & ISLASTCN) && nameiop != LOOKUP)
1073 de = devfs_parent_dirent(dd);
1076 dvplocked = VOP_ISLOCKED(dvp);
1078 error = devfs_allocv(de, mp, cnp->cn_lkflags & LK_TYPE_MASK,
1081 vn_lock(dvp, dvplocked | LK_RETRY);
1086 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen, 0);
1087 while (de == NULL) { /* While(...) so we can use break */
1089 if (nameiop == DELETE)
1093 * OK, we didn't have an entry for the name we were asked for
1094 * so we try to see if anybody can create it on demand.
1096 pname = devfs_fqpn(specname, dmp, dd, cnp);
1101 DEVFS_DMP_HOLD(dmp);
1102 sx_xunlock(&dmp->dm_lock);
1103 EVENTHANDLER_INVOKE(dev_clone,
1104 td->td_ucred, pname, strlen(pname), &cdev);
1107 sx_xlock(&dmp->dm_lock);
1108 else if (devfs_populate_vp(dvp) != 0) {
1110 sx_xlock(&dmp->dm_lock);
1111 if (DEVFS_DMP_DROP(dmp)) {
1112 sx_xunlock(&dmp->dm_lock);
1113 devfs_unmount_final(dmp);
1115 sx_xunlock(&dmp->dm_lock);
1119 if (DEVFS_DMP_DROP(dmp)) {
1121 sx_xunlock(&dmp->dm_lock);
1122 devfs_unmount_final(dmp);
1132 dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx];
1133 if (dde != NULL && *dde != NULL)
1140 if (de == NULL || de->de_flags & DE_WHITEOUT) {
1141 if ((nameiop == CREATE || nameiop == RENAME) &&
1142 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) {
1143 return (EJUSTRETURN);
1148 if (devfs_prison_check(de, td))
1151 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) {
1152 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
1161 error = devfs_allocv(de, mp, cnp->cn_lkflags & LK_TYPE_MASK, vpp);
1167 devfs_lookup(struct vop_lookup_args *ap)
1170 struct devfs_mount *dmp;
1173 if (devfs_populate_vp(ap->a_dvp) != 0)
1176 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
1178 j = devfs_lookupx(ap, &dm_unlock);
1180 sx_xunlock(&dmp->dm_lock);
1185 devfs_mknod(struct vop_mknod_args *ap)
1187 struct componentname *cnp;
1188 struct vnode *dvp, **vpp;
1189 struct devfs_dirent *dd, *de;
1190 struct devfs_mount *dmp;
1194 * The only type of node we should be creating here is a
1195 * character device, for anything else return EOPNOTSUPP.
1197 if (ap->a_vap->va_type != VCHR)
1198 return (EOPNOTSUPP);
1200 dmp = VFSTODEVFS(dvp->v_mount);
1207 sx_xlock(&dmp->dm_lock);
1208 TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
1209 if (cnp->cn_namelen != de->de_dirent->d_namlen)
1211 if (de->de_dirent->d_type == DT_CHR &&
1212 (de->de_cdp->cdp_flags & CDP_ACTIVE) == 0)
1214 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name,
1215 de->de_dirent->d_namlen) != 0)
1217 if (de->de_flags & DE_WHITEOUT)
1223 de->de_flags &= ~DE_WHITEOUT;
1224 error = devfs_allocv(de, dvp->v_mount, LK_EXCLUSIVE, vpp);
1227 sx_xunlock(&dmp->dm_lock);
1233 devfs_open(struct vop_open_args *ap)
1235 struct thread *td = ap->a_td;
1236 struct vnode *vp = ap->a_vp;
1237 struct cdev *dev = vp->v_rdev;
1238 struct file *fp = ap->a_fp;
1239 int error, ref, vlocked;
1243 if (vp->v_type == VBLK)
1249 /* Make this field valid before any I/O in d_open. */
1250 if (dev->si_iosize_max == 0)
1251 dev->si_iosize_max = DFLTPHYS;
1253 dsw = dev_refthread(dev, &ref);
1256 if (fp == NULL && dsw->d_fdopen != NULL) {
1257 dev_relthread(dev, ref);
1261 if (vp->v_type == VCHR)
1262 devfs_usecount_add(vp);
1264 vlocked = VOP_ISLOCKED(vp);
1273 if (dsw->d_fdopen != NULL)
1274 error = dsw->d_fdopen(dev, ap->a_mode, td, fp);
1276 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td);
1277 /* Clean up any cdevpriv upon error. */
1279 devfs_clear_cdevpriv();
1282 vn_lock(vp, vlocked | LK_RETRY);
1283 if (error != 0 && vp->v_type == VCHR)
1284 devfs_usecount_sub(vp);
1286 dev_relthread(dev, ref);
1288 if (error == ERESTART)
1293 #if 0 /* /dev/console */
1294 KASSERT(fp != NULL, ("Could not vnode bypass device on NULL fp"));
1299 if (fp->f_ops == &badfileops)
1300 finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f);
1305 devfs_pathconf(struct vop_pathconf_args *ap)
1308 switch (ap->a_name) {
1309 case _PC_FILESIZEBITS:
1313 *ap->a_retval = NAME_MAX;
1316 *ap->a_retval = INT_MAX;
1318 case _PC_SYMLINK_MAX:
1319 *ap->a_retval = MAXPATHLEN;
1322 if (ap->a_vp->v_vflag & VV_ISTTY) {
1323 *ap->a_retval = MAX_CANON;
1328 if (ap->a_vp->v_vflag & VV_ISTTY) {
1329 *ap->a_retval = MAX_INPUT;
1334 if (ap->a_vp->v_vflag & VV_ISTTY) {
1335 *ap->a_retval = _POSIX_VDISABLE;
1339 case _PC_MAC_PRESENT:
1342 * If MAC is enabled, devfs automatically supports
1343 * trivial non-persistent label storage.
1350 case _PC_CHOWN_RESTRICTED:
1354 return (vop_stdpathconf(ap));
1361 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td)
1369 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1371 error = vnops.fo_poll(fp, events, cred, td);
1374 error = dsw->d_poll(dev, events, td);
1376 dev_relthread(dev, ref);
1381 * Print out the contents of a special device vnode.
1384 devfs_print(struct vop_print_args *ap)
1387 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev));
1392 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred,
1393 int flags, struct thread *td)
1396 int ioflag, error, ref;
1401 if (uio->uio_resid > DEVFS_IOSIZE_MAX)
1404 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1406 error = vnops.fo_read(fp, uio, cred, flags, td);
1409 resid = uio->uio_resid;
1410 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT);
1411 if (ioflag & O_DIRECT)
1412 ioflag |= IO_DIRECT;
1414 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK);
1415 error = dsw->d_read(dev, uio, ioflag);
1416 if (uio->uio_resid != resid || (error == 0 && resid != 0))
1417 devfs_timestamp(&dev->si_atime);
1419 dev_relthread(dev, ref);
1421 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_R);
1426 devfs_readdir(struct vop_readdir_args *ap)
1431 struct devfs_dirent *dd;
1432 struct devfs_dirent *de;
1433 struct devfs_mount *dmp;
1435 int *tmp_ncookies = NULL;
1437 if (ap->a_vp->v_type != VDIR)
1441 if (uio->uio_offset < 0)
1445 * XXX: This is a temporary hack to get around this filesystem not
1446 * supporting cookies. We store the location of the ncookies pointer
1447 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent()
1448 * and set the number of cookies to 0. We then set the pointer to
1449 * NULL so that vfs_read_dirent doesn't try to call realloc() on
1450 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies
1451 * pointer to its original location before returning to the caller.
1453 if (ap->a_ncookies != NULL) {
1454 tmp_ncookies = ap->a_ncookies;
1455 *ap->a_ncookies = 0;
1456 ap->a_ncookies = NULL;
1459 dmp = VFSTODEVFS(ap->a_vp->v_mount);
1460 if (devfs_populate_vp(ap->a_vp) != 0) {
1461 if (tmp_ncookies != NULL)
1462 ap->a_ncookies = tmp_ncookies;
1466 de = ap->a_vp->v_data;
1468 TAILQ_FOREACH(dd, &de->de_dlist, de_list) {
1469 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__));
1470 if (dd->de_flags & (DE_COVERED | DE_WHITEOUT))
1472 if (devfs_prison_check(dd, uio->uio_td))
1474 if (dd->de_dirent->d_type == DT_DIR)
1479 MPASS(dp->d_reclen == GENERIC_DIRSIZ(dp));
1480 if (dp->d_reclen > uio->uio_resid)
1482 dp->d_fileno = de->de_inode;
1483 /* NOTE: d_off is the offset for the *next* entry. */
1484 dp->d_off = off + dp->d_reclen;
1485 if (off >= uio->uio_offset) {
1486 error = vfs_read_dirent(ap, dp, off);
1490 off += dp->d_reclen;
1492 sx_xunlock(&dmp->dm_lock);
1493 uio->uio_offset = off;
1496 * Restore ap->a_ncookies if it wasn't originally NULL in the first
1499 if (tmp_ncookies != NULL)
1500 ap->a_ncookies = tmp_ncookies;
1506 devfs_readlink(struct vop_readlink_args *ap)
1508 struct devfs_dirent *de;
1510 de = ap->a_vp->v_data;
1511 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio));
1515 devfs_reclaiml(struct vnode *vp)
1517 struct devfs_dirent *de;
1519 mtx_assert(&devfs_de_interlock, MA_OWNED);
1522 MPASS(de->de_usecount == 0);
1523 de->de_vnode = NULL;
1529 devfs_reclaim(struct vop_reclaim_args *ap)
1534 mtx_lock(&devfs_de_interlock);
1536 mtx_unlock(&devfs_de_interlock);
1541 devfs_reclaim_vchr(struct vop_reclaim_args *ap)
1547 MPASS(vp->v_type == VCHR);
1549 mtx_lock(&devfs_de_interlock);
1551 devfs_usecount_subl(vp);
1553 mtx_unlock(&devfs_de_interlock);
1565 devfs_remove(struct vop_remove_args *ap)
1567 struct vnode *dvp = ap->a_dvp;
1568 struct vnode *vp = ap->a_vp;
1569 struct devfs_dirent *dd;
1570 struct devfs_dirent *de, *de_covered;
1571 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount);
1573 ASSERT_VOP_ELOCKED(dvp, "devfs_remove");
1574 ASSERT_VOP_ELOCKED(vp, "devfs_remove");
1576 sx_xlock(&dmp->dm_lock);
1577 dd = ap->a_dvp->v_data;
1579 if (de->de_cdp == NULL) {
1580 TAILQ_REMOVE(&dd->de_dlist, de, de_list);
1581 if (de->de_dirent->d_type == DT_LNK) {
1582 de_covered = devfs_find(dd, de->de_dirent->d_name,
1583 de->de_dirent->d_namlen, 0);
1584 if (de_covered != NULL)
1585 de_covered->de_flags &= ~DE_COVERED;
1587 /* We need to unlock dvp because devfs_delete() may lock it. */
1591 devfs_delete(dmp, de, 0);
1592 sx_xunlock(&dmp->dm_lock);
1594 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1595 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1597 de->de_flags |= DE_WHITEOUT;
1598 sx_xunlock(&dmp->dm_lock);
1604 * Revoke is called on a tty when a terminal session ends. The vnode
1605 * is orphaned by setting v_op to deadfs so we need to let go of it
1606 * as well so that we create a new one next time around.
1610 devfs_revoke(struct vop_revoke_args *ap)
1612 struct vnode *vp = ap->a_vp, *vp2;
1614 struct cdev_priv *cdp;
1615 struct devfs_dirent *de;
1619 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL"));
1622 cdp = cdev2priv(dev);
1635 mtx_lock(&devfs_de_interlock);
1638 for (i = 0; i <= cdp->cdp_maxdirent; i++) {
1639 de = cdp->cdp_dirents[i];
1646 vs = vget_prep(vp2);
1647 mtx_unlock(&devfs_de_interlock);
1648 if (vget_finish(vp2, LK_EXCLUSIVE, vs) != 0)
1661 mtx_unlock(&devfs_de_interlock);
1666 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) {
1667 KASSERT((cdp->cdp_flags & CDP_ON_ACTIVE_LIST) != 0,
1668 ("%s: cdp %p (%s) not on active list",
1669 __func__, cdp, dev->si_name));
1670 cdp->cdp_flags &= ~CDP_ON_ACTIVE_LIST;
1671 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list);
1673 dev_rel(&cdp->cdp_c);
1677 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1682 devfs_rioctl(struct vop_ioctl_args *ap)
1685 struct devfs_mount *dmp;
1689 vn_lock(vp, LK_SHARED | LK_RETRY);
1690 if (VN_IS_DOOMED(vp)) {
1694 dmp = VFSTODEVFS(vp->v_mount);
1695 sx_xlock(&dmp->dm_lock);
1697 DEVFS_DMP_HOLD(dmp);
1698 devfs_populate(dmp);
1699 if (DEVFS_DMP_DROP(dmp)) {
1700 sx_xunlock(&dmp->dm_lock);
1701 devfs_unmount_final(dmp);
1704 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td);
1705 sx_xunlock(&dmp->dm_lock);
1710 devfs_rread(struct vop_read_args *ap)
1713 if (ap->a_vp->v_type != VDIR)
1715 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL));
1719 devfs_setattr(struct vop_setattr_args *ap)
1721 struct devfs_dirent *de;
1732 if ((vap->va_type != VNON) ||
1733 (vap->va_nlink != VNOVAL) ||
1734 (vap->va_fsid != VNOVAL) ||
1735 (vap->va_fileid != VNOVAL) ||
1736 (vap->va_blocksize != VNOVAL) ||
1737 (vap->va_flags != VNOVAL && vap->va_flags != 0) ||
1738 (vap->va_rdev != VNOVAL) ||
1739 ((int)vap->va_bytes != VNOVAL) ||
1740 (vap->va_gen != VNOVAL)) {
1744 error = devfs_populate_vp(vp);
1749 if (vp->v_type == VDIR)
1753 if (vap->va_uid == (uid_t)VNOVAL)
1757 if (vap->va_gid == (gid_t)VNOVAL)
1761 if (uid != de->de_uid || gid != de->de_gid) {
1762 if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid ||
1763 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) {
1764 error = priv_check(td, PRIV_VFS_CHOWN);
1773 if (vap->va_mode != (mode_t)VNOVAL) {
1774 if (ap->a_cred->cr_uid != de->de_uid) {
1775 error = priv_check(td, PRIV_VFS_ADMIN);
1779 de->de_mode = vap->va_mode;
1783 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
1784 error = vn_utimes_perm(vp, vap, ap->a_cred, td);
1787 if (vap->va_atime.tv_sec != VNOVAL) {
1788 if (vp->v_type == VCHR)
1789 vp->v_rdev->si_atime = vap->va_atime;
1791 de->de_atime = vap->va_atime;
1793 if (vap->va_mtime.tv_sec != VNOVAL) {
1794 if (vp->v_type == VCHR)
1795 vp->v_rdev->si_mtime = vap->va_mtime;
1797 de->de_mtime = vap->va_mtime;
1803 if (vp->v_type == VCHR)
1804 vfs_timestamp(&vp->v_rdev->si_ctime);
1806 vfs_timestamp(&de->de_mtime);
1810 sx_xunlock(&VFSTODEVFS(vp->v_mount)->dm_lock);
1816 devfs_setlabel(struct vop_setlabel_args *ap)
1819 struct devfs_dirent *de;
1824 mac_vnode_relabel(ap->a_cred, vp, ap->a_label);
1825 mac_devfs_update(vp->v_mount, de, vp);
1832 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred)
1835 return (vnops.fo_stat(fp, sb, cred));
1839 devfs_symlink(struct vop_symlink_args *ap)
1842 struct devfs_dirent *dd;
1843 struct devfs_dirent *de, *de_covered, *de_dotdot;
1844 struct devfs_mount *dmp;
1846 error = priv_check(curthread, PRIV_DEVFS_SYMLINK);
1849 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
1850 if (devfs_populate_vp(ap->a_dvp) != 0)
1853 dd = ap->a_dvp->v_data;
1854 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen);
1855 de->de_flags = DE_USER;
1859 de->de_inode = alloc_unr(devfs_inos);
1861 de->de_dirent->d_type = DT_LNK;
1862 i = strlen(ap->a_target) + 1;
1863 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK);
1864 bcopy(ap->a_target, de->de_symlink, i);
1866 mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de);
1868 de_covered = devfs_find(dd, de->de_dirent->d_name,
1869 de->de_dirent->d_namlen, 0);
1870 if (de_covered != NULL) {
1871 if ((de_covered->de_flags & DE_USER) != 0) {
1872 devfs_delete(dmp, de, DEVFS_DEL_NORECURSE);
1873 sx_xunlock(&dmp->dm_lock);
1876 KASSERT((de_covered->de_flags & DE_COVERED) == 0,
1877 ("devfs_symlink: entry %p already covered", de_covered));
1878 de_covered->de_flags |= DE_COVERED;
1881 de_dotdot = TAILQ_FIRST(&dd->de_dlist); /* "." */
1882 de_dotdot = TAILQ_NEXT(de_dotdot, de_list); /* ".." */
1883 TAILQ_INSERT_AFTER(&dd->de_dlist, de_dotdot, de, de_list);
1884 devfs_dir_ref_de(dmp, dd);
1885 devfs_rules_apply(dmp, de);
1887 return (devfs_allocv(de, ap->a_dvp->v_mount, LK_EXCLUSIVE, ap->a_vpp));
1891 devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td)
1894 return (vnops.fo_truncate(fp, length, cred, td));
1898 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred,
1899 int flags, struct thread *td)
1902 int error, ioflag, ref;
1907 if (uio->uio_resid > DEVFS_IOSIZE_MAX)
1910 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1912 error = vnops.fo_write(fp, uio, cred, flags, td);
1915 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td));
1916 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC);
1917 if (ioflag & O_DIRECT)
1918 ioflag |= IO_DIRECT;
1919 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK);
1921 resid = uio->uio_resid;
1923 error = dsw->d_write(dev, uio, ioflag);
1924 if (uio->uio_resid != resid || (error == 0 && resid != 0)) {
1925 devfs_timestamp(&dev->si_ctime);
1926 dev->si_mtime = dev->si_ctime;
1929 dev_relthread(dev, ref);
1931 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_W);
1936 devfs_mmap_f(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size,
1937 vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff,
1952 * Ensure that file and memory protections are
1956 if (mp != NULL && (mp->mnt_flag & MNT_NOEXEC) != 0) {
1957 maxprot = VM_PROT_NONE;
1958 if ((prot & VM_PROT_EXECUTE) != 0)
1961 maxprot = VM_PROT_EXECUTE;
1962 if ((fp->f_flag & FREAD) != 0)
1963 maxprot |= VM_PROT_READ;
1964 else if ((prot & VM_PROT_READ) != 0)
1968 * If we are sharing potential changes via MAP_SHARED and we
1969 * are trying to get write permission although we opened it
1970 * without asking for it, bail out.
1972 * Note that most character devices always share mappings.
1973 * The one exception is that D_MMAP_ANON devices
1974 * (i.e. /dev/zero) permit private writable mappings.
1976 * Rely on vm_mmap_cdev() to fail invalid MAP_PRIVATE requests
1977 * as well as updating maxprot to permit writing for
1978 * D_MMAP_ANON devices rather than doing that here.
1980 if ((flags & MAP_SHARED) != 0) {
1981 if ((fp->f_flag & FWRITE) != 0)
1982 maxprot |= VM_PROT_WRITE;
1983 else if ((prot & VM_PROT_WRITE) != 0)
1986 maxprot &= cap_maxprot;
1989 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1993 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, dev, dsw, &foff,
1996 dev_relthread(dev, ref);
2000 error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object,
2003 vm_object_deallocate(object);
2008 dev2udev(struct cdev *x)
2012 return (cdev2priv(x)->cdp_inode);
2015 static struct fileops devfs_ops_f = {
2016 .fo_read = devfs_read_f,
2017 .fo_write = devfs_write_f,
2018 .fo_truncate = devfs_truncate_f,
2019 .fo_ioctl = devfs_ioctl_f,
2020 .fo_poll = devfs_poll_f,
2021 .fo_kqfilter = devfs_kqfilter_f,
2022 .fo_stat = devfs_stat_f,
2023 .fo_close = devfs_close_f,
2024 .fo_chmod = vn_chmod,
2025 .fo_chown = vn_chown,
2026 .fo_sendfile = vn_sendfile,
2028 .fo_fill_kinfo = vn_fill_kinfo,
2029 .fo_mmap = devfs_mmap_f,
2030 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE
2033 /* Vops for non-CHR vnodes in /dev. */
2034 static struct vop_vector devfs_vnodeops = {
2035 .vop_default = &default_vnodeops,
2037 .vop_access = devfs_access,
2038 .vop_getattr = devfs_getattr,
2039 .vop_ioctl = devfs_rioctl,
2040 .vop_lookup = devfs_lookup,
2041 .vop_mknod = devfs_mknod,
2042 .vop_pathconf = devfs_pathconf,
2043 .vop_read = devfs_rread,
2044 .vop_readdir = devfs_readdir,
2045 .vop_readlink = devfs_readlink,
2046 .vop_reclaim = devfs_reclaim,
2047 .vop_remove = devfs_remove,
2048 .vop_revoke = devfs_revoke,
2049 .vop_setattr = devfs_setattr,
2051 .vop_setlabel = devfs_setlabel,
2053 .vop_symlink = devfs_symlink,
2054 .vop_vptocnp = devfs_vptocnp,
2055 .vop_lock1 = vop_lock,
2056 .vop_unlock = vop_unlock,
2057 .vop_islocked = vop_islocked,
2058 .vop_add_writecount = vop_stdadd_writecount_nomsync,
2060 VFS_VOP_VECTOR_REGISTER(devfs_vnodeops);
2062 /* Vops for VCHR vnodes in /dev. */
2063 static struct vop_vector devfs_specops = {
2064 .vop_default = &default_vnodeops,
2066 .vop_access = devfs_access,
2067 .vop_bmap = VOP_PANIC,
2068 .vop_close = devfs_close,
2069 .vop_create = VOP_PANIC,
2070 .vop_fsync = vop_stdfsync,
2071 .vop_getattr = devfs_getattr,
2072 .vop_ioctl = devfs_ioctl,
2073 .vop_link = VOP_PANIC,
2074 .vop_mkdir = VOP_PANIC,
2075 .vop_mknod = VOP_PANIC,
2076 .vop_open = devfs_open,
2077 .vop_pathconf = devfs_pathconf,
2078 .vop_poll = dead_poll,
2079 .vop_print = devfs_print,
2080 .vop_read = dead_read,
2081 .vop_readdir = VOP_PANIC,
2082 .vop_readlink = VOP_PANIC,
2083 .vop_reallocblks = VOP_PANIC,
2084 .vop_reclaim = devfs_reclaim_vchr,
2085 .vop_remove = devfs_remove,
2086 .vop_rename = VOP_PANIC,
2087 .vop_revoke = devfs_revoke,
2088 .vop_rmdir = VOP_PANIC,
2089 .vop_setattr = devfs_setattr,
2091 .vop_setlabel = devfs_setlabel,
2093 .vop_strategy = VOP_PANIC,
2094 .vop_symlink = VOP_PANIC,
2095 .vop_vptocnp = devfs_vptocnp,
2096 .vop_write = dead_write,
2097 .vop_lock1 = vop_lock,
2098 .vop_unlock = vop_unlock,
2099 .vop_islocked = vop_islocked,
2100 .vop_add_writecount = vop_stdadd_writecount_nomsync,
2102 VFS_VOP_VECTOR_REGISTER(devfs_specops);
2105 * Our calling convention to the device drivers used to be that we passed
2106 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_
2107 * flags instead since that's what open(), close() and ioctl() takes and
2108 * we don't really want vnode.h in device drivers.
2109 * We solved the source compatibility by redefining some vnode flags to
2110 * be the same as the fcntl ones and by sending down the bitwise OR of
2111 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody
2112 * pulls the rug out under this.
2114 CTASSERT(O_NONBLOCK == IO_NDELAY);
2115 CTASSERT(O_FSYNC == IO_SYNC);