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 mtx cdevpriv_mtx;
89 MTX_SYSINIT(cdevpriv_mtx, &cdevpriv_mtx, "cdevpriv lock", MTX_DEF);
91 SYSCTL_DECL(_vfs_devfs);
93 static int devfs_dotimes;
94 SYSCTL_INT(_vfs_devfs, OID_AUTO, dotimes, CTLFLAG_RW,
95 &devfs_dotimes, 0, "Update timestamps on DEVFS with default precision");
98 * Update devfs node timestamp. Note that updates are unlocked and
99 * stat(2) could see partially updated times.
102 devfs_timestamp(struct timespec *tsp)
110 if (tsp->tv_sec != ts) {
118 devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp,
121 *dswp = devvn_refthread(fp->f_vnode, devp, ref);
122 if (*dswp == NULL || *devp != fp->f_data) {
124 dev_relthread(*devp, *ref);
127 KASSERT((*devp)->si_refcount > 0,
128 ("devfs: un-referenced struct cdev *(%s)", devtoname(*devp)));
131 curthread->td_fpop = fp;
136 devfs_get_cdevpriv(void **datap)
139 struct cdev_privdata *p;
142 fp = curthread->td_fpop;
148 *datap = p->cdpd_data;
155 devfs_set_cdevpriv(void *priv, d_priv_dtor_t *priv_dtr)
158 struct cdev_priv *cdp;
159 struct cdev_privdata *p;
162 fp = curthread->td_fpop;
165 cdp = cdev2priv((struct cdev *)fp->f_data);
166 p = malloc(sizeof(struct cdev_privdata), M_CDEVPDATA, M_WAITOK);
168 p->cdpd_dtr = priv_dtr;
170 mtx_lock(&cdevpriv_mtx);
171 if (fp->f_cdevpriv == NULL) {
172 LIST_INSERT_HEAD(&cdp->cdp_fdpriv, p, cdpd_list);
174 mtx_unlock(&cdevpriv_mtx);
177 mtx_unlock(&cdevpriv_mtx);
178 free(p, M_CDEVPDATA);
185 devfs_destroy_cdevpriv(struct cdev_privdata *p)
188 mtx_assert(&cdevpriv_mtx, MA_OWNED);
189 KASSERT(p->cdpd_fp->f_cdevpriv == p,
190 ("devfs_destoy_cdevpriv %p != %p", p->cdpd_fp->f_cdevpriv, p));
191 p->cdpd_fp->f_cdevpriv = NULL;
192 LIST_REMOVE(p, cdpd_list);
193 mtx_unlock(&cdevpriv_mtx);
194 (p->cdpd_dtr)(p->cdpd_data);
195 free(p, M_CDEVPDATA);
199 devfs_fpdrop(struct file *fp)
201 struct cdev_privdata *p;
203 mtx_lock(&cdevpriv_mtx);
204 if ((p = fp->f_cdevpriv) == NULL) {
205 mtx_unlock(&cdevpriv_mtx);
208 devfs_destroy_cdevpriv(p);
212 devfs_clear_cdevpriv(void)
216 fp = curthread->td_fpop;
223 devfs_usecount_add(struct vnode *vp)
225 struct devfs_dirent *de;
228 mtx_lock(&devfs_de_interlock);
230 VNPASS(vp->v_type == VCHR || vp->v_type == VBAD, vp);
231 if (VN_IS_DOOMED(vp)) {
243 mtx_unlock(&devfs_de_interlock);
247 devfs_usecount_subl(struct vnode *vp)
249 struct devfs_dirent *de;
252 mtx_assert(&devfs_de_interlock, MA_OWNED);
253 ASSERT_VI_LOCKED(vp, __func__);
254 VNPASS(vp->v_type == VCHR || vp->v_type == VBAD, vp);
261 MPASS(de->de_usecount == 0);
264 if (dev->si_usecount < de->de_usecount)
265 panic("%s: si_usecount underflow for dev %p "
266 "(has %ld, dirent has %d)\n",
267 __func__, dev, dev->si_usecount, de->de_usecount);
268 if (VN_IS_DOOMED(vp)) {
269 dev->si_usecount -= de->de_usecount;
272 if (de->de_usecount == 0)
273 panic("%s: de_usecount underflow for dev %p\n",
281 devfs_usecount_sub(struct vnode *vp)
284 mtx_lock(&devfs_de_interlock);
286 devfs_usecount_subl(vp);
288 mtx_unlock(&devfs_de_interlock);
292 devfs_usecountl(struct vnode *vp)
295 VNPASS(vp->v_type == VCHR, vp);
296 mtx_assert(&devfs_de_interlock, MA_OWNED);
297 ASSERT_VI_LOCKED(vp, __func__);
298 return (vp->v_rdev->si_usecount);
302 devfs_usecount(struct vnode *vp)
306 VNPASS(vp->v_type == VCHR, vp);
307 mtx_lock(&devfs_de_interlock);
309 count = devfs_usecountl(vp);
311 mtx_unlock(&devfs_de_interlock);
316 devfs_ctty_ref(struct vnode *vp)
320 devfs_usecount_add(vp);
324 devfs_ctty_unref(struct vnode *vp)
327 devfs_usecount_sub(vp);
332 * On success devfs_populate_vp() returns with dmp->dm_lock held.
335 devfs_populate_vp(struct vnode *vp)
337 struct devfs_dirent *de;
338 struct devfs_mount *dmp;
341 ASSERT_VOP_LOCKED(vp, "devfs_populate_vp");
343 dmp = VFSTODEVFS(vp->v_mount);
344 if (!devfs_populate_needed(dmp)) {
345 sx_xlock(&dmp->dm_lock);
349 locked = VOP_ISLOCKED(vp);
351 sx_xlock(&dmp->dm_lock);
354 /* Can't call devfs_populate() with the vnode lock held. */
358 sx_xunlock(&dmp->dm_lock);
359 vn_lock(vp, locked | LK_RETRY);
360 sx_xlock(&dmp->dm_lock);
361 if (DEVFS_DMP_DROP(dmp)) {
362 sx_xunlock(&dmp->dm_lock);
363 devfs_unmount_final(dmp);
367 if (VN_IS_DOOMED(vp)) {
368 sx_xunlock(&dmp->dm_lock);
373 ("devfs_populate_vp: vp->v_data == NULL but vnode not doomed"));
374 if ((de->de_flags & DE_DOOMED) != 0) {
375 sx_xunlock(&dmp->dm_lock);
383 devfs_vptocnp(struct vop_vptocnp_args *ap)
385 struct vnode *vp = ap->a_vp;
386 struct vnode **dvp = ap->a_vpp;
387 struct devfs_mount *dmp;
388 char *buf = ap->a_buf;
389 size_t *buflen = ap->a_buflen;
390 struct devfs_dirent *dd, *de;
393 dmp = VFSTODEVFS(vp->v_mount);
395 error = devfs_populate_vp(vp);
399 if (vp->v_type != VCHR && vp->v_type != VDIR) {
405 if (vp->v_type == VDIR && dd == dmp->dm_rootdir) {
412 i -= dd->de_dirent->d_namlen;
417 bcopy(dd->de_dirent->d_name, buf + i, dd->de_dirent->d_namlen);
419 de = devfs_parent_dirent(dd);
424 mtx_lock(&devfs_de_interlock);
428 mtx_unlock(&devfs_de_interlock);
434 mtx_unlock(&devfs_de_interlock);
438 sx_xunlock(&dmp->dm_lock);
443 * Construct the fully qualified path name relative to the mountpoint.
444 * If a NULL cnp is provided, no '/' is appended to the resulting path.
447 devfs_fqpn(char *buf, struct devfs_mount *dmp, struct devfs_dirent *dd,
448 struct componentname *cnp)
451 struct devfs_dirent *de;
453 sx_assert(&dmp->dm_lock, SA_LOCKED);
458 i -= cnp->cn_namelen;
462 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen);
464 while (de != dmp->dm_rootdir) {
465 if (cnp != NULL || i < SPECNAMELEN) {
471 i -= de->de_dirent->d_namlen;
474 bcopy(de->de_dirent->d_name, buf + i,
475 de->de_dirent->d_namlen);
476 de = devfs_parent_dirent(de);
484 devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp,
485 struct devfs_dirent *de)
490 if (de->de_flags & DE_DOOMED)
492 if (DEVFS_DE_DROP(de)) {
493 KASSERT(not_found == 1, ("DEVFS de dropped but not doomed"));
494 devfs_dirent_free(de);
496 if (DEVFS_DMP_DROP(dmp)) {
497 KASSERT(not_found == 1,
498 ("DEVFS mount struct freed before dirent"));
500 sx_xunlock(&dmp->dm_lock);
501 devfs_unmount_final(dmp);
503 if (not_found == 1 || (drop_dm_lock && not_found != 2))
504 sx_unlock(&dmp->dm_lock);
509 * devfs_allocv shall be entered with dmp->dm_lock held, and it drops
513 devfs_allocv(struct devfs_dirent *de, struct mount *mp, int lockmode,
519 struct devfs_mount *dmp;
523 dmp = VFSTODEVFS(mp);
524 if (de->de_flags & DE_DOOMED) {
525 sx_xunlock(&dmp->dm_lock);
531 mtx_lock(&devfs_de_interlock);
535 mtx_unlock(&devfs_de_interlock);
536 sx_xunlock(&dmp->dm_lock);
537 vget_finish(vp, lockmode | LK_RETRY, vs);
538 sx_xlock(&dmp->dm_lock);
539 if (devfs_allocv_drop_refs(0, dmp, de)) {
543 else if (VN_IS_DOOMED(vp)) {
544 mtx_lock(&devfs_de_interlock);
545 if (de->de_vnode == vp) {
549 mtx_unlock(&devfs_de_interlock);
553 sx_xunlock(&dmp->dm_lock);
557 mtx_unlock(&devfs_de_interlock);
558 if (de->de_dirent->d_type == DT_CHR) {
559 if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) {
560 devfs_allocv_drop_refs(1, dmp, de);
563 dev = &de->de_cdp->cdp_c;
567 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp);
569 devfs_allocv_drop_refs(1, dmp, de);
570 printf("devfs_allocv: failed to allocate new vnode\n");
574 if (de->de_dirent->d_type == DT_CHR) {
579 /* XXX: v_rdev should be protect by vnode lock */
581 VNPASS(vp->v_usecount == 1, vp);
582 /* Special casing of ttys for deadfs. Probably redundant. */
584 if (dsw != NULL && (dsw->d_flags & D_TTY) != 0)
585 vp->v_vflag |= VV_ISTTY;
588 if ((dev->si_flags & SI_ETERNAL) != 0)
589 vp->v_vflag |= VV_ETERNALDEV;
590 vp->v_op = &devfs_specops;
591 } else if (de->de_dirent->d_type == DT_DIR) {
593 } else if (de->de_dirent->d_type == DT_LNK) {
598 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS);
600 mtx_lock(&devfs_de_interlock);
603 mtx_unlock(&devfs_de_interlock);
604 error = insmntque1(vp, mp);
606 mtx_lock(&devfs_de_interlock);
609 mtx_unlock(&devfs_de_interlock);
612 (void) devfs_allocv_drop_refs(1, dmp, de);
615 if (devfs_allocv_drop_refs(0, dmp, de)) {
621 mac_devfs_vnode_associate(mp, de, vp);
623 sx_xunlock(&dmp->dm_lock);
624 vn_set_state(vp, VSTATE_CONSTRUCTED);
630 devfs_access(struct vop_access_args *ap)
632 struct vnode *vp = ap->a_vp;
633 struct devfs_dirent *de;
638 if (vp->v_type == VDIR)
641 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid,
642 ap->a_accmode, ap->a_cred);
647 p = ap->a_td->td_proc;
648 /* We do, however, allow access to the controlling terminal */
650 if (!(p->p_flag & P_CONTROLT)) {
654 if (p->p_session->s_ttydp == de->de_cdp)
660 _Static_assert(((FMASK | FCNTLFLAGS) & (FLASTCLOSE | FREVOKE)) == 0,
661 "devfs-only flag reuse failed");
664 devfs_close(struct vop_close_args *ap)
666 struct vnode *vp = ap->a_vp, *oldvp;
667 struct thread *td = ap->a_td;
669 struct cdev *dev = vp->v_rdev;
671 struct devfs_dirent *de = vp->v_data;
672 int dflags, error, ref, vp_locked;
675 * XXX: Don't call d_close() if we were called because of
676 * XXX: insmntque() failure.
678 if (vp->v_data == NULL)
682 * Hack: a tty device that is a controlling terminal
683 * has a reference from the session structure.
684 * We cannot easily tell that a character device is
685 * a controlling terminal, unless it is the closing
686 * process' controlling terminal. In that case,
687 * if the reference count is 2 (this last descriptor
688 * plus the session), release the reference from the session.
690 if (de->de_usecount == 2 && td != NULL) {
693 if (vp == p->p_session->s_ttyvp) {
696 sx_xlock(&proctree_lock);
697 if (vp == p->p_session->s_ttyvp) {
698 SESS_LOCK(p->p_session);
699 mtx_lock(&devfs_de_interlock);
701 if (devfs_usecountl(vp) == 2 && !VN_IS_DOOMED(vp)) {
702 p->p_session->s_ttyvp = NULL;
703 p->p_session->s_ttydp = NULL;
707 mtx_unlock(&devfs_de_interlock);
708 SESS_UNLOCK(p->p_session);
710 sx_xunlock(&proctree_lock);
712 devfs_ctty_unref(oldvp);
717 * We do not want to really close the device if it
718 * is still in use unless we are trying to close it
719 * forcibly. Since every use (buffer, vnode, swap, cmap)
720 * holds a reference to the vnode, and because we mark
721 * any other vnodes that alias this device, when the
722 * sum of the reference counts on all the aliased
723 * vnodes descends to one, we are on last close.
725 dsw = dev_refthread(dev, &ref);
729 mtx_lock(&devfs_de_interlock);
731 if (devfs_usecountl(vp) == 1)
732 dflags |= FLASTCLOSE;
733 devfs_usecount_subl(vp);
734 mtx_unlock(&devfs_de_interlock);
735 if (VN_IS_DOOMED(vp)) {
737 dflags |= FREVOKE | FNONBLOCK;
738 } else if (dsw->d_flags & D_TRACKCLOSE) {
739 /* Keep device updated on status. */
740 } else if ((dflags & FLASTCLOSE) == 0) {
742 dev_relthread(dev, ref);
747 vp_locked = VOP_ISLOCKED(vp);
749 KASSERT(dev->si_refcount > 0,
750 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev)));
751 error = dsw->d_close(dev, ap->a_fflag | dflags, S_IFCHR, td);
752 dev_relthread(dev, ref);
753 vn_lock(vp, vp_locked | LK_RETRY);
759 devfs_close_f(struct file *fp, struct thread *td)
765 * NB: td may be NULL if this descriptor is closed due to
766 * garbage collection from a closed UNIX domain socket.
768 fpop = curthread->td_fpop;
769 curthread->td_fpop = fp;
770 error = vnops.fo_close(fp, td);
771 curthread->td_fpop = fpop;
774 * The f_cdevpriv cannot be assigned non-NULL value while we
775 * are destroying the file.
777 if (fp->f_cdevpriv != NULL)
783 devfs_getattr(struct vop_getattr_args *ap)
785 struct vnode *vp = ap->a_vp;
786 struct vattr *vap = ap->a_vap;
787 struct devfs_dirent *de;
788 struct devfs_mount *dmp;
790 struct timeval boottime;
793 error = devfs_populate_vp(vp);
797 dmp = VFSTODEVFS(vp->v_mount);
798 sx_xunlock(&dmp->dm_lock);
801 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp));
802 if (vp->v_type == VDIR) {
805 ("Null dir dirent in devfs_getattr vp=%p", vp));
807 vap->va_uid = de->de_uid;
808 vap->va_gid = de->de_gid;
809 vap->va_mode = de->de_mode;
810 if (vp->v_type == VLNK)
811 vap->va_size = strlen(de->de_symlink);
812 else if (vp->v_type == VDIR)
813 vap->va_size = vap->va_bytes = DEV_BSIZE;
816 if (vp->v_type != VDIR)
818 vap->va_blocksize = DEV_BSIZE;
819 vap->va_type = vp->v_type;
821 getboottime(&boottime);
824 if ((aa).tv_sec <= 3600) { \
825 (aa).tv_sec = boottime.tv_sec; \
826 (aa).tv_nsec = boottime.tv_usec * 1000; \
830 if (vp->v_type != VCHR) {
832 vap->va_atime = de->de_atime;
834 vap->va_mtime = de->de_mtime;
836 vap->va_ctime = de->de_ctime;
840 vap->va_atime = dev->si_atime;
842 vap->va_mtime = dev->si_mtime;
844 vap->va_ctime = dev->si_ctime;
846 vap->va_rdev = cdev2priv(dev)->cdp_inode;
851 vap->va_nlink = de->de_links;
852 vap->va_fileid = de->de_inode;
859 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td)
866 error = vnops.fo_ioctl(fp, com, data, cred, td);
872 fiodgname_buf_get_ptr(void *fgnp, u_long com)
875 struct fiodgname_arg fgn;
876 #ifdef COMPAT_FREEBSD32
877 struct fiodgname_arg32 fgn32;
884 return (fgnup->fgn.buf);
885 #ifdef COMPAT_FREEBSD32
887 return ((void *)(uintptr_t)fgnup->fgn32.buf);
890 panic("Unhandled ioctl command %ld", com);
895 devfs_ioctl(struct vop_ioctl_args *ap)
897 struct fiodgname_arg *fgn;
898 struct vnode *vpold, *vp;
901 struct session *sess;
911 dsw = devvn_refthread(vp, &dev, &ref);
914 KASSERT(dev->si_refcount > 0,
915 ("devfs: un-referenced struct cdev *(%s)", devtoname(dev)));
919 *(int *)ap->a_data = dsw->d_flags & D_TYPEMASK;
923 #ifdef COMPAT_FREEBSD32
932 error = copyout(p, fiodgname_buf_get_ptr(fgn, com), i);
935 error = dsw->d_ioctl(dev, com, ap->a_data, ap->a_fflag, td);
938 dev_relthread(dev, ref);
939 if (error == ENOIOCTL)
942 if (error == 0 && com == TIOCSCTTY) {
944 * Do nothing if reassigning same control tty, or if the
945 * control tty has already disappeared. If it disappeared,
946 * it's because we were racing with TIOCNOTTY. TIOCNOTTY
947 * already took care of releasing the old vnode and we have
948 * nothing left to do.
950 sx_slock(&proctree_lock);
951 sess = td->td_proc->p_session;
952 if (sess->s_ttyvp == vp || sess->s_ttyp == NULL) {
953 sx_sunlock(&proctree_lock);
959 vpold = sess->s_ttyvp;
961 sess->s_ttydp = cdev2priv(dev);
964 sx_sunlock(&proctree_lock);
966 /* Get rid of reference to old control tty */
968 devfs_ctty_unref(vpold);
975 devfs_kqfilter_f(struct file *fp, struct knote *kn)
985 error = devfs_fp_check(fp, &dev, &dsw, &ref);
988 error = dsw->d_kqfilter(dev, kn);
990 dev_relthread(dev, ref);
995 devfs_prison_check(struct devfs_dirent *de, struct thread *td)
997 struct cdev_priv *cdp;
1005 dcr = cdp->cdp_c.si_cred;
1009 error = prison_check(td->td_ucred, dcr);
1012 /* We do, however, allow access to the controlling terminal */
1015 if (!(p->p_flag & P_CONTROLT)) {
1019 if (p->p_session->s_ttydp == cdp)
1026 devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock)
1028 struct componentname *cnp;
1029 struct vnode *dvp, **vpp;
1031 struct devfs_dirent *de, *dd;
1032 struct devfs_dirent **dde;
1033 struct devfs_mount *dmp;
1036 int error, flags, nameiop, dvplocked;
1037 char specname[SPECNAMELEN + 1], *pname;
1043 pname = cnp->cn_nameptr;
1044 flags = cnp->cn_flags;
1045 nameiop = cnp->cn_nameiop;
1047 dmp = VFSTODEVFS(mp);
1051 if ((flags & ISLASTCN) && nameiop == RENAME)
1052 return (EOPNOTSUPP);
1054 if (dvp->v_type != VDIR)
1057 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT))
1060 error = vn_dir_check_exec(dvp, cnp);
1064 if (cnp->cn_namelen == 1 && *pname == '.') {
1065 if ((flags & ISLASTCN) && nameiop != LOOKUP)
1072 if (flags & ISDOTDOT) {
1073 if ((flags & ISLASTCN) && nameiop != LOOKUP)
1075 de = devfs_parent_dirent(dd);
1078 dvplocked = VOP_ISLOCKED(dvp);
1080 error = devfs_allocv(de, mp, cnp->cn_lkflags & LK_TYPE_MASK,
1083 vn_lock(dvp, dvplocked | LK_RETRY);
1088 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen, 0);
1089 while (de == NULL) { /* While(...) so we can use break */
1091 if (nameiop == DELETE)
1095 * OK, we didn't have an entry for the name we were asked for
1096 * so we try to see if anybody can create it on demand.
1098 pname = devfs_fqpn(specname, dmp, dd, cnp);
1103 DEVFS_DMP_HOLD(dmp);
1104 sx_xunlock(&dmp->dm_lock);
1105 EVENTHANDLER_INVOKE(dev_clone,
1106 td->td_ucred, pname, strlen(pname), &cdev);
1109 sx_xlock(&dmp->dm_lock);
1110 else if (devfs_populate_vp(dvp) != 0) {
1112 sx_xlock(&dmp->dm_lock);
1113 if (DEVFS_DMP_DROP(dmp)) {
1114 sx_xunlock(&dmp->dm_lock);
1115 devfs_unmount_final(dmp);
1117 sx_xunlock(&dmp->dm_lock);
1121 if (DEVFS_DMP_DROP(dmp)) {
1123 sx_xunlock(&dmp->dm_lock);
1124 devfs_unmount_final(dmp);
1134 dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx];
1135 if (dde != NULL && *dde != NULL)
1142 if (de == NULL || de->de_flags & DE_WHITEOUT) {
1143 if ((nameiop == CREATE || nameiop == RENAME) &&
1144 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) {
1145 return (EJUSTRETURN);
1150 if (devfs_prison_check(de, td))
1153 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) {
1154 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
1163 error = devfs_allocv(de, mp, cnp->cn_lkflags & LK_TYPE_MASK, vpp);
1169 devfs_lookup(struct vop_lookup_args *ap)
1172 struct devfs_mount *dmp;
1175 if (devfs_populate_vp(ap->a_dvp) != 0)
1178 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
1180 j = devfs_lookupx(ap, &dm_unlock);
1182 sx_xunlock(&dmp->dm_lock);
1187 devfs_mknod(struct vop_mknod_args *ap)
1189 struct componentname *cnp;
1190 struct vnode *dvp, **vpp;
1191 struct devfs_dirent *dd, *de;
1192 struct devfs_mount *dmp;
1196 * The only type of node we should be creating here is a
1197 * character device, for anything else return EOPNOTSUPP.
1199 if (ap->a_vap->va_type != VCHR)
1200 return (EOPNOTSUPP);
1202 dmp = VFSTODEVFS(dvp->v_mount);
1209 sx_xlock(&dmp->dm_lock);
1210 TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
1211 if (cnp->cn_namelen != de->de_dirent->d_namlen)
1213 if (de->de_dirent->d_type == DT_CHR &&
1214 (de->de_cdp->cdp_flags & CDP_ACTIVE) == 0)
1216 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name,
1217 de->de_dirent->d_namlen) != 0)
1219 if (de->de_flags & DE_WHITEOUT)
1225 de->de_flags &= ~DE_WHITEOUT;
1226 error = devfs_allocv(de, dvp->v_mount, LK_EXCLUSIVE, vpp);
1229 sx_xunlock(&dmp->dm_lock);
1235 devfs_open(struct vop_open_args *ap)
1237 struct thread *td = ap->a_td;
1238 struct vnode *vp = ap->a_vp;
1239 struct cdev *dev = vp->v_rdev;
1240 struct file *fp = ap->a_fp;
1241 int error, ref, vlocked;
1245 if (vp->v_type == VBLK)
1251 /* Make this field valid before any I/O in d_open. */
1252 if (dev->si_iosize_max == 0)
1253 dev->si_iosize_max = DFLTPHYS;
1255 dsw = dev_refthread(dev, &ref);
1258 if (fp == NULL && dsw->d_fdopen != NULL) {
1259 dev_relthread(dev, ref);
1263 if (vp->v_type == VCHR)
1264 devfs_usecount_add(vp);
1266 vlocked = VOP_ISLOCKED(vp);
1275 if (dsw->d_fdopen != NULL)
1276 error = dsw->d_fdopen(dev, ap->a_mode, td, fp);
1278 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td);
1279 /* Clean up any cdevpriv upon error. */
1281 devfs_clear_cdevpriv();
1284 vn_lock(vp, vlocked | LK_RETRY);
1285 if (error != 0 && vp->v_type == VCHR)
1286 devfs_usecount_sub(vp);
1288 dev_relthread(dev, ref);
1290 if (error == ERESTART)
1295 #if 0 /* /dev/console */
1296 KASSERT(fp != NULL, ("Could not vnode bypass device on NULL fp"));
1301 if (fp->f_ops == &badfileops)
1302 finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f);
1307 devfs_pathconf(struct vop_pathconf_args *ap)
1310 switch (ap->a_name) {
1311 case _PC_FILESIZEBITS:
1315 *ap->a_retval = NAME_MAX;
1318 *ap->a_retval = INT_MAX;
1320 case _PC_SYMLINK_MAX:
1321 *ap->a_retval = MAXPATHLEN;
1324 if (ap->a_vp->v_vflag & VV_ISTTY) {
1325 *ap->a_retval = MAX_CANON;
1330 if (ap->a_vp->v_vflag & VV_ISTTY) {
1331 *ap->a_retval = MAX_INPUT;
1336 if (ap->a_vp->v_vflag & VV_ISTTY) {
1337 *ap->a_retval = _POSIX_VDISABLE;
1341 case _PC_MAC_PRESENT:
1344 * If MAC is enabled, devfs automatically supports
1345 * trivial non-persistent label storage.
1352 case _PC_CHOWN_RESTRICTED:
1356 return (vop_stdpathconf(ap));
1363 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td)
1371 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1373 error = vnops.fo_poll(fp, events, cred, td);
1376 error = dsw->d_poll(dev, events, td);
1378 dev_relthread(dev, ref);
1383 * Print out the contents of a special device vnode.
1386 devfs_print(struct vop_print_args *ap)
1389 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev));
1394 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred,
1395 int flags, struct thread *td)
1398 int ioflag, error, ref;
1403 if (uio->uio_resid > DEVFS_IOSIZE_MAX)
1406 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1408 error = vnops.fo_read(fp, uio, cred, flags, td);
1411 resid = uio->uio_resid;
1412 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT);
1413 if (ioflag & O_DIRECT)
1414 ioflag |= IO_DIRECT;
1416 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK);
1417 error = dsw->d_read(dev, uio, ioflag);
1418 if (uio->uio_resid != resid || (error == 0 && resid != 0))
1419 devfs_timestamp(&dev->si_atime);
1421 dev_relthread(dev, ref);
1423 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_R);
1428 devfs_readdir(struct vop_readdir_args *ap)
1433 struct devfs_dirent *dd;
1434 struct devfs_dirent *de;
1435 struct devfs_mount *dmp;
1437 int *tmp_ncookies = NULL;
1439 if (ap->a_vp->v_type != VDIR)
1443 if (uio->uio_offset < 0)
1447 * XXX: This is a temporary hack to get around this filesystem not
1448 * supporting cookies. We store the location of the ncookies pointer
1449 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent()
1450 * and set the number of cookies to 0. We then set the pointer to
1451 * NULL so that vfs_read_dirent doesn't try to call realloc() on
1452 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies
1453 * pointer to its original location before returning to the caller.
1455 if (ap->a_ncookies != NULL) {
1456 tmp_ncookies = ap->a_ncookies;
1457 *ap->a_ncookies = 0;
1458 ap->a_ncookies = NULL;
1461 dmp = VFSTODEVFS(ap->a_vp->v_mount);
1462 if (devfs_populate_vp(ap->a_vp) != 0) {
1463 if (tmp_ncookies != NULL)
1464 ap->a_ncookies = tmp_ncookies;
1468 de = ap->a_vp->v_data;
1470 TAILQ_FOREACH(dd, &de->de_dlist, de_list) {
1471 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__));
1472 if (dd->de_flags & (DE_COVERED | DE_WHITEOUT))
1474 if (devfs_prison_check(dd, uio->uio_td))
1476 if (dd->de_dirent->d_type == DT_DIR)
1481 MPASS(dp->d_reclen == GENERIC_DIRSIZ(dp));
1482 if (dp->d_reclen > uio->uio_resid)
1484 dp->d_fileno = de->de_inode;
1485 /* NOTE: d_off is the offset for the *next* entry. */
1486 dp->d_off = off + dp->d_reclen;
1487 if (off >= uio->uio_offset) {
1488 error = vfs_read_dirent(ap, dp, off);
1492 off += dp->d_reclen;
1494 sx_xunlock(&dmp->dm_lock);
1495 uio->uio_offset = off;
1498 * Restore ap->a_ncookies if it wasn't originally NULL in the first
1501 if (tmp_ncookies != NULL)
1502 ap->a_ncookies = tmp_ncookies;
1508 devfs_readlink(struct vop_readlink_args *ap)
1510 struct devfs_dirent *de;
1512 de = ap->a_vp->v_data;
1513 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio));
1517 devfs_reclaiml(struct vnode *vp)
1519 struct devfs_dirent *de;
1521 mtx_assert(&devfs_de_interlock, MA_OWNED);
1524 MPASS(de->de_usecount == 0);
1525 de->de_vnode = NULL;
1531 devfs_reclaim(struct vop_reclaim_args *ap)
1536 mtx_lock(&devfs_de_interlock);
1538 mtx_unlock(&devfs_de_interlock);
1543 devfs_reclaim_vchr(struct vop_reclaim_args *ap)
1549 MPASS(vp->v_type == VCHR);
1551 mtx_lock(&devfs_de_interlock);
1553 devfs_usecount_subl(vp);
1555 mtx_unlock(&devfs_de_interlock);
1567 devfs_remove(struct vop_remove_args *ap)
1569 struct vnode *dvp = ap->a_dvp;
1570 struct vnode *vp = ap->a_vp;
1571 struct devfs_dirent *dd;
1572 struct devfs_dirent *de, *de_covered;
1573 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount);
1575 ASSERT_VOP_ELOCKED(dvp, "devfs_remove");
1576 ASSERT_VOP_ELOCKED(vp, "devfs_remove");
1578 sx_xlock(&dmp->dm_lock);
1579 dd = ap->a_dvp->v_data;
1581 if (de->de_cdp == NULL) {
1582 TAILQ_REMOVE(&dd->de_dlist, de, de_list);
1583 if (de->de_dirent->d_type == DT_LNK) {
1584 de_covered = devfs_find(dd, de->de_dirent->d_name,
1585 de->de_dirent->d_namlen, 0);
1586 if (de_covered != NULL)
1587 de_covered->de_flags &= ~DE_COVERED;
1589 /* We need to unlock dvp because devfs_delete() may lock it. */
1593 devfs_delete(dmp, de, 0);
1594 sx_xunlock(&dmp->dm_lock);
1596 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1597 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1599 de->de_flags |= DE_WHITEOUT;
1600 sx_xunlock(&dmp->dm_lock);
1606 * Revoke is called on a tty when a terminal session ends. The vnode
1607 * is orphaned by setting v_op to deadfs so we need to let go of it
1608 * as well so that we create a new one next time around.
1612 devfs_revoke(struct vop_revoke_args *ap)
1614 struct vnode *vp = ap->a_vp, *vp2;
1616 struct cdev_priv *cdp;
1617 struct devfs_dirent *de;
1621 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL"));
1624 cdp = cdev2priv(dev);
1637 mtx_lock(&devfs_de_interlock);
1640 for (i = 0; i <= cdp->cdp_maxdirent; i++) {
1641 de = cdp->cdp_dirents[i];
1648 vs = vget_prep(vp2);
1649 mtx_unlock(&devfs_de_interlock);
1650 if (vget_finish(vp2, LK_EXCLUSIVE, vs) != 0)
1663 mtx_unlock(&devfs_de_interlock);
1668 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) {
1669 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list);
1671 dev_rel(&cdp->cdp_c);
1675 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1680 devfs_rioctl(struct vop_ioctl_args *ap)
1683 struct devfs_mount *dmp;
1687 vn_lock(vp, LK_SHARED | LK_RETRY);
1688 if (VN_IS_DOOMED(vp)) {
1692 dmp = VFSTODEVFS(vp->v_mount);
1693 sx_xlock(&dmp->dm_lock);
1695 DEVFS_DMP_HOLD(dmp);
1696 devfs_populate(dmp);
1697 if (DEVFS_DMP_DROP(dmp)) {
1698 sx_xunlock(&dmp->dm_lock);
1699 devfs_unmount_final(dmp);
1702 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td);
1703 sx_xunlock(&dmp->dm_lock);
1708 devfs_rread(struct vop_read_args *ap)
1711 if (ap->a_vp->v_type != VDIR)
1713 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL));
1717 devfs_setattr(struct vop_setattr_args *ap)
1719 struct devfs_dirent *de;
1730 if ((vap->va_type != VNON) ||
1731 (vap->va_nlink != VNOVAL) ||
1732 (vap->va_fsid != VNOVAL) ||
1733 (vap->va_fileid != VNOVAL) ||
1734 (vap->va_blocksize != VNOVAL) ||
1735 (vap->va_flags != VNOVAL && vap->va_flags != 0) ||
1736 (vap->va_rdev != VNOVAL) ||
1737 ((int)vap->va_bytes != VNOVAL) ||
1738 (vap->va_gen != VNOVAL)) {
1742 error = devfs_populate_vp(vp);
1747 if (vp->v_type == VDIR)
1751 if (vap->va_uid == (uid_t)VNOVAL)
1755 if (vap->va_gid == (gid_t)VNOVAL)
1759 if (uid != de->de_uid || gid != de->de_gid) {
1760 if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid ||
1761 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) {
1762 error = priv_check(td, PRIV_VFS_CHOWN);
1771 if (vap->va_mode != (mode_t)VNOVAL) {
1772 if (ap->a_cred->cr_uid != de->de_uid) {
1773 error = priv_check(td, PRIV_VFS_ADMIN);
1777 de->de_mode = vap->va_mode;
1781 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
1782 error = vn_utimes_perm(vp, vap, ap->a_cred, td);
1785 if (vap->va_atime.tv_sec != VNOVAL) {
1786 if (vp->v_type == VCHR)
1787 vp->v_rdev->si_atime = vap->va_atime;
1789 de->de_atime = vap->va_atime;
1791 if (vap->va_mtime.tv_sec != VNOVAL) {
1792 if (vp->v_type == VCHR)
1793 vp->v_rdev->si_mtime = vap->va_mtime;
1795 de->de_mtime = vap->va_mtime;
1801 if (vp->v_type == VCHR)
1802 vfs_timestamp(&vp->v_rdev->si_ctime);
1804 vfs_timestamp(&de->de_mtime);
1808 sx_xunlock(&VFSTODEVFS(vp->v_mount)->dm_lock);
1814 devfs_setlabel(struct vop_setlabel_args *ap)
1817 struct devfs_dirent *de;
1822 mac_vnode_relabel(ap->a_cred, vp, ap->a_label);
1823 mac_devfs_update(vp->v_mount, de, vp);
1830 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred)
1833 return (vnops.fo_stat(fp, sb, cred));
1837 devfs_symlink(struct vop_symlink_args *ap)
1840 struct devfs_dirent *dd;
1841 struct devfs_dirent *de, *de_covered, *de_dotdot;
1842 struct devfs_mount *dmp;
1844 error = priv_check(curthread, PRIV_DEVFS_SYMLINK);
1847 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
1848 if (devfs_populate_vp(ap->a_dvp) != 0)
1851 dd = ap->a_dvp->v_data;
1852 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen);
1853 de->de_flags = DE_USER;
1857 de->de_inode = alloc_unr(devfs_inos);
1859 de->de_dirent->d_type = DT_LNK;
1860 i = strlen(ap->a_target) + 1;
1861 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK);
1862 bcopy(ap->a_target, de->de_symlink, i);
1864 mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de);
1866 de_covered = devfs_find(dd, de->de_dirent->d_name,
1867 de->de_dirent->d_namlen, 0);
1868 if (de_covered != NULL) {
1869 if ((de_covered->de_flags & DE_USER) != 0) {
1870 devfs_delete(dmp, de, DEVFS_DEL_NORECURSE);
1871 sx_xunlock(&dmp->dm_lock);
1874 KASSERT((de_covered->de_flags & DE_COVERED) == 0,
1875 ("devfs_symlink: entry %p already covered", de_covered));
1876 de_covered->de_flags |= DE_COVERED;
1879 de_dotdot = TAILQ_FIRST(&dd->de_dlist); /* "." */
1880 de_dotdot = TAILQ_NEXT(de_dotdot, de_list); /* ".." */
1881 TAILQ_INSERT_AFTER(&dd->de_dlist, de_dotdot, de, de_list);
1882 devfs_dir_ref_de(dmp, dd);
1883 devfs_rules_apply(dmp, de);
1885 return (devfs_allocv(de, ap->a_dvp->v_mount, LK_EXCLUSIVE, ap->a_vpp));
1889 devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td)
1892 return (vnops.fo_truncate(fp, length, cred, td));
1896 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred,
1897 int flags, struct thread *td)
1900 int error, ioflag, ref;
1905 if (uio->uio_resid > DEVFS_IOSIZE_MAX)
1908 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1910 error = vnops.fo_write(fp, uio, cred, flags, td);
1913 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td));
1914 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC);
1915 if (ioflag & O_DIRECT)
1916 ioflag |= IO_DIRECT;
1917 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK);
1919 resid = uio->uio_resid;
1921 error = dsw->d_write(dev, uio, ioflag);
1922 if (uio->uio_resid != resid || (error == 0 && resid != 0)) {
1923 devfs_timestamp(&dev->si_ctime);
1924 dev->si_mtime = dev->si_ctime;
1927 dev_relthread(dev, ref);
1929 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_W);
1934 devfs_mmap_f(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size,
1935 vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff,
1950 * Ensure that file and memory protections are
1954 if (mp != NULL && (mp->mnt_flag & MNT_NOEXEC) != 0) {
1955 maxprot = VM_PROT_NONE;
1956 if ((prot & VM_PROT_EXECUTE) != 0)
1959 maxprot = VM_PROT_EXECUTE;
1960 if ((fp->f_flag & FREAD) != 0)
1961 maxprot |= VM_PROT_READ;
1962 else if ((prot & VM_PROT_READ) != 0)
1966 * If we are sharing potential changes via MAP_SHARED and we
1967 * are trying to get write permission although we opened it
1968 * without asking for it, bail out.
1970 * Note that most character devices always share mappings.
1971 * The one exception is that D_MMAP_ANON devices
1972 * (i.e. /dev/zero) permit private writable mappings.
1974 * Rely on vm_mmap_cdev() to fail invalid MAP_PRIVATE requests
1975 * as well as updating maxprot to permit writing for
1976 * D_MMAP_ANON devices rather than doing that here.
1978 if ((flags & MAP_SHARED) != 0) {
1979 if ((fp->f_flag & FWRITE) != 0)
1980 maxprot |= VM_PROT_WRITE;
1981 else if ((prot & VM_PROT_WRITE) != 0)
1984 maxprot &= cap_maxprot;
1987 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1991 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, dev, dsw, &foff,
1994 dev_relthread(dev, ref);
1998 error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object,
2001 vm_object_deallocate(object);
2006 dev2udev(struct cdev *x)
2010 return (cdev2priv(x)->cdp_inode);
2013 static struct fileops devfs_ops_f = {
2014 .fo_read = devfs_read_f,
2015 .fo_write = devfs_write_f,
2016 .fo_truncate = devfs_truncate_f,
2017 .fo_ioctl = devfs_ioctl_f,
2018 .fo_poll = devfs_poll_f,
2019 .fo_kqfilter = devfs_kqfilter_f,
2020 .fo_stat = devfs_stat_f,
2021 .fo_close = devfs_close_f,
2022 .fo_chmod = vn_chmod,
2023 .fo_chown = vn_chown,
2024 .fo_sendfile = vn_sendfile,
2026 .fo_fill_kinfo = vn_fill_kinfo,
2027 .fo_mmap = devfs_mmap_f,
2028 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE
2031 /* Vops for non-CHR vnodes in /dev. */
2032 static struct vop_vector devfs_vnodeops = {
2033 .vop_default = &default_vnodeops,
2035 .vop_access = devfs_access,
2036 .vop_getattr = devfs_getattr,
2037 .vop_ioctl = devfs_rioctl,
2038 .vop_lookup = devfs_lookup,
2039 .vop_mknod = devfs_mknod,
2040 .vop_pathconf = devfs_pathconf,
2041 .vop_read = devfs_rread,
2042 .vop_readdir = devfs_readdir,
2043 .vop_readlink = devfs_readlink,
2044 .vop_reclaim = devfs_reclaim,
2045 .vop_remove = devfs_remove,
2046 .vop_revoke = devfs_revoke,
2047 .vop_setattr = devfs_setattr,
2049 .vop_setlabel = devfs_setlabel,
2051 .vop_symlink = devfs_symlink,
2052 .vop_vptocnp = devfs_vptocnp,
2053 .vop_lock1 = vop_lock,
2054 .vop_unlock = vop_unlock,
2055 .vop_islocked = vop_islocked,
2056 .vop_add_writecount = vop_stdadd_writecount_nomsync,
2058 VFS_VOP_VECTOR_REGISTER(devfs_vnodeops);
2060 /* Vops for VCHR vnodes in /dev. */
2061 static struct vop_vector devfs_specops = {
2062 .vop_default = &default_vnodeops,
2064 .vop_access = devfs_access,
2065 .vop_bmap = VOP_PANIC,
2066 .vop_close = devfs_close,
2067 .vop_create = VOP_PANIC,
2068 .vop_fsync = vop_stdfsync,
2069 .vop_getattr = devfs_getattr,
2070 .vop_ioctl = devfs_ioctl,
2071 .vop_link = VOP_PANIC,
2072 .vop_mkdir = VOP_PANIC,
2073 .vop_mknod = VOP_PANIC,
2074 .vop_open = devfs_open,
2075 .vop_pathconf = devfs_pathconf,
2076 .vop_poll = dead_poll,
2077 .vop_print = devfs_print,
2078 .vop_read = dead_read,
2079 .vop_readdir = VOP_PANIC,
2080 .vop_readlink = VOP_PANIC,
2081 .vop_reallocblks = VOP_PANIC,
2082 .vop_reclaim = devfs_reclaim_vchr,
2083 .vop_remove = devfs_remove,
2084 .vop_rename = VOP_PANIC,
2085 .vop_revoke = devfs_revoke,
2086 .vop_rmdir = VOP_PANIC,
2087 .vop_setattr = devfs_setattr,
2089 .vop_setlabel = devfs_setlabel,
2091 .vop_strategy = VOP_PANIC,
2092 .vop_symlink = VOP_PANIC,
2093 .vop_vptocnp = devfs_vptocnp,
2094 .vop_write = dead_write,
2095 .vop_lock1 = vop_lock,
2096 .vop_unlock = vop_unlock,
2097 .vop_islocked = vop_islocked,
2098 .vop_add_writecount = vop_stdadd_writecount_nomsync,
2100 VFS_VOP_VECTOR_REGISTER(devfs_specops);
2103 * Our calling convention to the device drivers used to be that we passed
2104 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_
2105 * flags instead since that's what open(), close() and ioctl() takes and
2106 * we don't really want vnode.h in device drivers.
2107 * We solved the source compatibility by redefining some vnode flags to
2108 * be the same as the fcntl ones and by sending down the bitwise OR of
2109 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody
2110 * pulls the rug out under this.
2112 CTASSERT(O_NONBLOCK == IO_NDELAY);
2113 CTASSERT(O_FSYNC == IO_SYNC);