2 * Copyright (c) 2000-2004
3 * Poul-Henning Kamp. All rights reserved.
4 * Copyright (c) 1989, 1992-1993, 1995
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software donated to Berkeley by
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * @(#)kernfs_vnops.c 8.15 (Berkeley) 5/21/95
32 * 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/fcntl.h>
48 #include <sys/filedesc.h>
49 #include <sys/filio.h>
51 #include <sys/kernel.h>
53 #include <sys/malloc.h>
54 #include <sys/mount.h>
55 #include <sys/namei.h>
61 #include <sys/ttycom.h>
62 #include <sys/unistd.h>
63 #include <sys/vnode.h>
65 static struct vop_vector devfs_vnodeops;
66 static struct vop_vector devfs_specops;
67 static struct fileops devfs_ops_f;
69 #include <fs/devfs/devfs.h>
70 #include <fs/devfs/devfs_int.h>
72 #include <security/mac/mac_framework.h>
74 static MALLOC_DEFINE(M_CDEVPDATA, "DEVFSP", "Metainfo for cdev-fp data");
76 struct mtx devfs_de_interlock;
77 MTX_SYSINIT(devfs_de_interlock, &devfs_de_interlock, "devfs interlock", MTX_DEF);
78 struct sx clone_drain_lock;
79 SX_SYSINIT(clone_drain_lock, &clone_drain_lock, "clone events drain lock");
80 struct mtx cdevpriv_mtx;
81 MTX_SYSINIT(cdevpriv_mtx, &cdevpriv_mtx, "cdevpriv lock", MTX_DEF);
84 devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp,
88 *dswp = devvn_refthread(fp->f_vnode, devp, ref);
89 if (*devp != fp->f_data) {
91 dev_relthread(*devp, *ref);
94 KASSERT((*devp)->si_refcount > 0,
95 ("devfs: un-referenced struct cdev *(%s)", devtoname(*devp)));
98 curthread->td_fpop = fp;
103 devfs_get_cdevpriv(void **datap)
106 struct cdev_privdata *p;
109 fp = curthread->td_fpop;
115 *datap = p->cdpd_data;
122 devfs_set_cdevpriv(void *priv, cdevpriv_dtr_t priv_dtr)
125 struct cdev_priv *cdp;
126 struct cdev_privdata *p;
129 fp = curthread->td_fpop;
132 cdp = cdev2priv((struct cdev *)fp->f_data);
133 p = malloc(sizeof(struct cdev_privdata), M_CDEVPDATA, M_WAITOK);
135 p->cdpd_dtr = priv_dtr;
137 mtx_lock(&cdevpriv_mtx);
138 if (fp->f_cdevpriv == NULL) {
139 LIST_INSERT_HEAD(&cdp->cdp_fdpriv, p, cdpd_list);
141 mtx_unlock(&cdevpriv_mtx);
144 mtx_unlock(&cdevpriv_mtx);
145 free(p, M_CDEVPDATA);
152 devfs_destroy_cdevpriv(struct cdev_privdata *p)
155 mtx_assert(&cdevpriv_mtx, MA_OWNED);
156 p->cdpd_fp->f_cdevpriv = NULL;
157 LIST_REMOVE(p, cdpd_list);
158 mtx_unlock(&cdevpriv_mtx);
159 (p->cdpd_dtr)(p->cdpd_data);
160 free(p, M_CDEVPDATA);
164 devfs_fpdrop(struct file *fp)
166 struct cdev_privdata *p;
168 mtx_lock(&cdevpriv_mtx);
169 if ((p = fp->f_cdevpriv) == NULL) {
170 mtx_unlock(&cdevpriv_mtx);
173 devfs_destroy_cdevpriv(p);
177 devfs_clear_cdevpriv(void)
181 fp = curthread->td_fpop;
188 * On success devfs_populate_vp() returns with dmp->dm_lock held.
191 devfs_populate_vp(struct vnode *vp)
193 struct devfs_dirent *de;
194 struct devfs_mount *dmp;
197 ASSERT_VOP_LOCKED(vp, "devfs_populate_vp");
199 dmp = VFSTODEVFS(vp->v_mount);
200 locked = VOP_ISLOCKED(vp);
202 sx_xlock(&dmp->dm_lock);
205 /* Can't call devfs_populate() with the vnode lock held. */
209 sx_xunlock(&dmp->dm_lock);
210 vn_lock(vp, locked | LK_RETRY);
211 sx_xlock(&dmp->dm_lock);
212 if (DEVFS_DMP_DROP(dmp)) {
213 sx_xunlock(&dmp->dm_lock);
214 devfs_unmount_final(dmp);
217 if ((vp->v_iflag & VI_DOOMED) != 0) {
218 sx_xunlock(&dmp->dm_lock);
223 ("devfs_populate_vp: vp->v_data == NULL but vnode not doomed"));
224 if ((de->de_flags & DE_DOOMED) != 0) {
225 sx_xunlock(&dmp->dm_lock);
233 devfs_vptocnp(struct vop_vptocnp_args *ap)
235 struct vnode *vp = ap->a_vp;
236 struct vnode **dvp = ap->a_vpp;
237 struct devfs_mount *dmp;
238 char *buf = ap->a_buf;
239 int *buflen = ap->a_buflen;
240 struct devfs_dirent *dd, *de;
243 dmp = VFSTODEVFS(vp->v_mount);
245 error = devfs_populate_vp(vp);
252 if (vp->v_type == VCHR) {
253 i -= strlen(dd->de_cdp->cdp_c.si_name);
258 bcopy(dd->de_cdp->cdp_c.si_name, buf + i,
259 strlen(dd->de_cdp->cdp_c.si_name));
261 } else if (vp->v_type == VDIR) {
262 if (dd == dmp->dm_rootdir) {
267 i -= dd->de_dirent->d_namlen;
272 bcopy(dd->de_dirent->d_name, buf + i,
273 dd->de_dirent->d_namlen);
280 de = devfs_parent_dirent(de);
285 mtx_lock(&devfs_de_interlock);
289 mtx_unlock(&devfs_de_interlock);
295 mtx_unlock(&devfs_de_interlock);
299 sx_xunlock(&dmp->dm_lock);
304 * Construct the fully qualified path name relative to the mountpoint.
305 * If a NULL cnp is provided, no '/' is appended to the resulting path.
308 devfs_fqpn(char *buf, struct devfs_mount *dmp, struct devfs_dirent *dd,
309 struct componentname *cnp)
312 struct devfs_dirent *de;
314 sx_assert(&dmp->dm_lock, SA_LOCKED);
319 i -= cnp->cn_namelen;
323 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen);
325 while (de != dmp->dm_rootdir) {
326 if (cnp != NULL || i < SPECNAMELEN) {
332 i -= de->de_dirent->d_namlen;
335 bcopy(de->de_dirent->d_name, buf + i,
336 de->de_dirent->d_namlen);
337 de = devfs_parent_dirent(de);
345 devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp,
346 struct devfs_dirent *de)
351 if (de->de_flags & DE_DOOMED)
353 if (DEVFS_DE_DROP(de)) {
354 KASSERT(not_found == 1, ("DEVFS de dropped but not doomed"));
355 devfs_dirent_free(de);
357 if (DEVFS_DMP_DROP(dmp)) {
358 KASSERT(not_found == 1,
359 ("DEVFS mount struct freed before dirent"));
361 sx_xunlock(&dmp->dm_lock);
362 devfs_unmount_final(dmp);
364 if (not_found == 1 || (drop_dm_lock && not_found != 2))
365 sx_unlock(&dmp->dm_lock);
370 devfs_insmntque_dtr(struct vnode *vp, void *arg)
372 struct devfs_dirent *de;
374 de = (struct devfs_dirent *)arg;
375 mtx_lock(&devfs_de_interlock);
378 mtx_unlock(&devfs_de_interlock);
384 * devfs_allocv shall be entered with dmp->dm_lock held, and it drops
388 devfs_allocv(struct devfs_dirent *de, struct mount *mp, int lockmode,
394 struct devfs_mount *dmp;
397 dmp = VFSTODEVFS(mp);
398 if (de->de_flags & DE_DOOMED) {
399 sx_xunlock(&dmp->dm_lock);
405 mtx_lock(&devfs_de_interlock);
409 mtx_unlock(&devfs_de_interlock);
410 sx_xunlock(&dmp->dm_lock);
411 vget(vp, lockmode | LK_INTERLOCK | LK_RETRY, curthread);
412 sx_xlock(&dmp->dm_lock);
413 if (devfs_allocv_drop_refs(0, dmp, de)) {
417 else if ((vp->v_iflag & VI_DOOMED) != 0) {
418 mtx_lock(&devfs_de_interlock);
419 if (de->de_vnode == vp) {
423 mtx_unlock(&devfs_de_interlock);
427 sx_xunlock(&dmp->dm_lock);
431 mtx_unlock(&devfs_de_interlock);
432 if (de->de_dirent->d_type == DT_CHR) {
433 if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) {
434 devfs_allocv_drop_refs(1, dmp, de);
437 dev = &de->de_cdp->cdp_c;
441 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp);
443 devfs_allocv_drop_refs(1, dmp, de);
444 printf("devfs_allocv: failed to allocate new vnode\n");
448 if (de->de_dirent->d_type == DT_CHR) {
453 /* XXX: v_rdev should be protect by vnode lock */
455 KASSERT(vp->v_usecount == 1,
456 ("%s %d (%d)\n", __func__, __LINE__, vp->v_usecount));
457 dev->si_usecount += vp->v_usecount;
458 /* Special casing of ttys for deadfs. Probably redundant. */
460 if (dsw != NULL && (dsw->d_flags & D_TTY) != 0)
461 vp->v_vflag |= VV_ISTTY;
464 if ((dev->si_flags & SI_ETERNAL) != 0)
465 vp->v_vflag |= VV_ETERNALDEV;
466 vp->v_op = &devfs_specops;
467 } else if (de->de_dirent->d_type == DT_DIR) {
469 } else if (de->de_dirent->d_type == DT_LNK) {
474 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS);
476 mtx_lock(&devfs_de_interlock);
479 mtx_unlock(&devfs_de_interlock);
480 error = insmntque1(vp, mp, devfs_insmntque_dtr, de);
482 (void) devfs_allocv_drop_refs(1, dmp, de);
485 if (devfs_allocv_drop_refs(0, dmp, de)) {
490 mac_devfs_vnode_associate(mp, de, vp);
492 sx_xunlock(&dmp->dm_lock);
498 devfs_access(struct vop_access_args *ap)
500 struct vnode *vp = ap->a_vp;
501 struct devfs_dirent *de;
505 if (vp->v_type == VDIR)
508 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid,
509 ap->a_accmode, ap->a_cred, NULL);
514 /* We do, however, allow access to the controlling terminal */
515 if (!(ap->a_td->td_proc->p_flag & P_CONTROLT))
517 if (ap->a_td->td_proc->p_session->s_ttydp == de->de_cdp)
524 devfs_close(struct vop_close_args *ap)
526 struct vnode *vp = ap->a_vp, *oldvp;
527 struct thread *td = ap->a_td;
528 struct cdev *dev = vp->v_rdev;
530 int vp_locked, error, ref;
533 * XXX: Don't call d_close() if we were called because of
534 * XXX: insmntque1() failure.
536 if (vp->v_data == NULL)
540 * Hack: a tty device that is a controlling terminal
541 * has a reference from the session structure.
542 * We cannot easily tell that a character device is
543 * a controlling terminal, unless it is the closing
544 * process' controlling terminal. In that case,
545 * if the reference count is 2 (this last descriptor
546 * plus the session), release the reference from the session.
549 sx_xlock(&proctree_lock);
550 if (td && vp == td->td_proc->p_session->s_ttyvp) {
551 SESS_LOCK(td->td_proc->p_session);
553 if (count_dev(dev) == 2 && (vp->v_iflag & VI_DOOMED) == 0) {
554 td->td_proc->p_session->s_ttyvp = NULL;
555 td->td_proc->p_session->s_ttydp = NULL;
559 SESS_UNLOCK(td->td_proc->p_session);
561 sx_xunlock(&proctree_lock);
565 * We do not want to really close the device if it
566 * is still in use unless we are trying to close it
567 * forcibly. Since every use (buffer, vnode, swap, cmap)
568 * holds a reference to the vnode, and because we mark
569 * any other vnodes that alias this device, when the
570 * sum of the reference counts on all the aliased
571 * vnodes descends to one, we are on last close.
573 dsw = dev_refthread(dev, &ref);
577 if (vp->v_iflag & VI_DOOMED) {
579 } else if (dsw->d_flags & D_TRACKCLOSE) {
580 /* Keep device updated on status. */
581 } else if (count_dev(dev) > 1) {
583 dev_relthread(dev, ref);
588 vp_locked = VOP_ISLOCKED(vp);
590 KASSERT(dev->si_refcount > 0,
591 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev)));
592 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td);
593 dev_relthread(dev, ref);
594 vn_lock(vp, vp_locked | LK_RETRY);
600 devfs_close_f(struct file *fp, struct thread *td)
607 error = vnops.fo_close(fp, td);
611 * The f_cdevpriv cannot be assigned non-NULL value while we
612 * are destroying the file.
614 if (fp->f_cdevpriv != NULL)
620 devfs_fsync(struct vop_fsync_args *ap)
624 struct devfs_dirent *de;
626 if (!vn_isdisk(ap->a_vp, &error)) {
627 bo = &ap->a_vp->v_bufobj;
628 de = ap->a_vp->v_data;
629 if (error == ENXIO && bo->bo_dirty.bv_cnt > 0) {
630 printf("Device %s went missing before all of the data "
631 "could be written to it; expect data loss.\n",
632 de->de_dirent->d_name);
634 error = vop_stdfsync(ap);
635 if (bo->bo_dirty.bv_cnt != 0 || error != 0)
636 panic("devfs_fsync: vop_stdfsync failed.");
642 return (vop_stdfsync(ap));
646 devfs_getattr(struct vop_getattr_args *ap)
648 struct vnode *vp = ap->a_vp;
649 struct vattr *vap = ap->a_vap;
651 struct devfs_dirent *de;
652 struct devfs_mount *dmp;
655 error = devfs_populate_vp(vp);
659 dmp = VFSTODEVFS(vp->v_mount);
660 sx_xunlock(&dmp->dm_lock);
663 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp));
664 if (vp->v_type == VDIR) {
667 ("Null dir dirent in devfs_getattr vp=%p", vp));
669 vap->va_uid = de->de_uid;
670 vap->va_gid = de->de_gid;
671 vap->va_mode = de->de_mode;
672 if (vp->v_type == VLNK)
673 vap->va_size = strlen(de->de_symlink);
674 else if (vp->v_type == VDIR)
675 vap->va_size = vap->va_bytes = DEV_BSIZE;
678 if (vp->v_type != VDIR)
680 vap->va_blocksize = DEV_BSIZE;
681 vap->va_type = vp->v_type;
685 if ((aa).tv_sec <= 3600) { \
686 (aa).tv_sec = boottime.tv_sec; \
687 (aa).tv_nsec = boottime.tv_usec * 1000; \
691 if (vp->v_type != VCHR) {
693 vap->va_atime = de->de_atime;
695 vap->va_mtime = de->de_mtime;
697 vap->va_ctime = de->de_ctime;
701 vap->va_atime = dev->si_atime;
703 vap->va_mtime = dev->si_mtime;
705 vap->va_ctime = dev->si_ctime;
707 vap->va_rdev = cdev2priv(dev)->cdp_inode;
712 vap->va_nlink = de->de_links;
713 vap->va_fileid = de->de_inode;
720 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td)
728 struct fiodgname_arg *fgn;
732 error = devfs_fp_check(fp, &dev, &dsw, &ref);
736 if (com == FIODTYPE) {
737 *(int *)data = dsw->d_flags & D_TYPEMASK;
739 dev_relthread(dev, ref);
741 } else if (com == FIODGNAME) {
748 error = copyout(p, fgn->buf, i);
750 dev_relthread(dev, ref);
753 error = dsw->d_ioctl(dev, com, data, fp->f_flag, td);
755 dev_relthread(dev, ref);
756 if (error == ENOIOCTL)
758 if (error == 0 && com == TIOCSCTTY) {
761 /* Do nothing if reassigning same control tty */
762 sx_slock(&proctree_lock);
763 if (td->td_proc->p_session->s_ttyvp == vp) {
764 sx_sunlock(&proctree_lock);
768 vpold = td->td_proc->p_session->s_ttyvp;
770 SESS_LOCK(td->td_proc->p_session);
771 td->td_proc->p_session->s_ttyvp = vp;
772 td->td_proc->p_session->s_ttydp = cdev2priv(dev);
773 SESS_UNLOCK(td->td_proc->p_session);
775 sx_sunlock(&proctree_lock);
777 /* Get rid of reference to old control tty */
786 devfs_kqfilter_f(struct file *fp, struct knote *kn)
796 error = devfs_fp_check(fp, &dev, &dsw, &ref);
799 error = dsw->d_kqfilter(dev, kn);
801 dev_relthread(dev, ref);
806 devfs_prison_check(struct devfs_dirent *de, struct thread *td)
808 struct cdev_priv *cdp;
815 dcr = cdp->cdp_c.si_cred;
819 error = prison_check(td->td_ucred, dcr);
822 /* We do, however, allow access to the controlling terminal */
823 if (!(td->td_proc->p_flag & P_CONTROLT))
825 if (td->td_proc->p_session->s_ttydp == cdp)
831 devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock)
833 struct componentname *cnp;
834 struct vnode *dvp, **vpp;
836 struct devfs_dirent *de, *dd;
837 struct devfs_dirent **dde;
838 struct devfs_mount *dmp;
840 int error, flags, nameiop, dvplocked;
841 char specname[SPECNAMELEN + 1], *pname;
846 pname = cnp->cn_nameptr;
848 flags = cnp->cn_flags;
849 nameiop = cnp->cn_nameiop;
850 dmp = VFSTODEVFS(dvp->v_mount);
854 if ((flags & ISLASTCN) && nameiop == RENAME)
857 if (dvp->v_type != VDIR)
860 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT))
863 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td);
867 if (cnp->cn_namelen == 1 && *pname == '.') {
868 if ((flags & ISLASTCN) && nameiop != LOOKUP)
875 if (flags & ISDOTDOT) {
876 if ((flags & ISLASTCN) && nameiop != LOOKUP)
878 de = devfs_parent_dirent(dd);
881 dvplocked = VOP_ISLOCKED(dvp);
883 error = devfs_allocv(de, dvp->v_mount,
884 cnp->cn_lkflags & LK_TYPE_MASK, vpp);
886 vn_lock(dvp, dvplocked | LK_RETRY);
891 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen, 0);
892 while (de == NULL) { /* While(...) so we can use break */
894 if (nameiop == DELETE)
898 * OK, we didn't have an entry for the name we were asked for
899 * so we try to see if anybody can create it on demand.
901 pname = devfs_fqpn(specname, dmp, dd, cnp);
907 sx_xunlock(&dmp->dm_lock);
908 sx_slock(&clone_drain_lock);
909 EVENTHANDLER_INVOKE(dev_clone,
910 td->td_ucred, pname, strlen(pname), &cdev);
911 sx_sunlock(&clone_drain_lock);
914 sx_xlock(&dmp->dm_lock);
915 else if (devfs_populate_vp(dvp) != 0) {
917 sx_xlock(&dmp->dm_lock);
918 if (DEVFS_DMP_DROP(dmp)) {
919 sx_xunlock(&dmp->dm_lock);
920 devfs_unmount_final(dmp);
922 sx_xunlock(&dmp->dm_lock);
926 if (DEVFS_DMP_DROP(dmp)) {
928 sx_xunlock(&dmp->dm_lock);
929 devfs_unmount_final(dmp);
939 dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx];
940 if (dde != NULL && *dde != NULL)
947 if (de == NULL || de->de_flags & DE_WHITEOUT) {
948 if ((nameiop == CREATE || nameiop == RENAME) &&
949 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) {
950 cnp->cn_flags |= SAVENAME;
951 return (EJUSTRETURN);
956 if (devfs_prison_check(de, td))
959 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) {
960 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
969 error = devfs_allocv(de, dvp->v_mount, cnp->cn_lkflags & LK_TYPE_MASK,
976 devfs_lookup(struct vop_lookup_args *ap)
979 struct devfs_mount *dmp;
982 if (devfs_populate_vp(ap->a_dvp) != 0)
985 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
987 j = devfs_lookupx(ap, &dm_unlock);
989 sx_xunlock(&dmp->dm_lock);
994 devfs_mknod(struct vop_mknod_args *ap)
996 struct componentname *cnp;
997 struct vnode *dvp, **vpp;
998 struct devfs_dirent *dd, *de;
999 struct devfs_mount *dmp;
1003 * The only type of node we should be creating here is a
1004 * character device, for anything else return EOPNOTSUPP.
1006 if (ap->a_vap->va_type != VCHR)
1007 return (EOPNOTSUPP);
1009 dmp = VFSTODEVFS(dvp->v_mount);
1016 sx_xlock(&dmp->dm_lock);
1017 TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
1018 if (cnp->cn_namelen != de->de_dirent->d_namlen)
1020 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name,
1021 de->de_dirent->d_namlen) != 0)
1023 if (de->de_flags & DE_WHITEOUT)
1029 de->de_flags &= ~DE_WHITEOUT;
1030 error = devfs_allocv(de, dvp->v_mount, LK_EXCLUSIVE, vpp);
1033 sx_xunlock(&dmp->dm_lock);
1039 devfs_open(struct vop_open_args *ap)
1041 struct thread *td = ap->a_td;
1042 struct vnode *vp = ap->a_vp;
1043 struct cdev *dev = vp->v_rdev;
1044 struct file *fp = ap->a_fp;
1045 int error, ref, vlocked;
1049 if (vp->v_type == VBLK)
1055 /* Make this field valid before any I/O in d_open. */
1056 if (dev->si_iosize_max == 0)
1057 dev->si_iosize_max = DFLTPHYS;
1059 dsw = dev_refthread(dev, &ref);
1062 if (fp == NULL && dsw->d_fdopen != NULL) {
1063 dev_relthread(dev, ref);
1067 vlocked = VOP_ISLOCKED(vp);
1076 if (dsw->d_fdopen != NULL)
1077 error = dsw->d_fdopen(dev, ap->a_mode, td, fp);
1079 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td);
1082 vn_lock(vp, vlocked | LK_RETRY);
1083 dev_relthread(dev, ref);
1087 #if 0 /* /dev/console */
1088 KASSERT(fp != NULL, ("Could not vnode bypass device on NULL fp"));
1093 if (fp->f_ops == &badfileops)
1094 finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f);
1099 devfs_pathconf(struct vop_pathconf_args *ap)
1102 switch (ap->a_name) {
1103 case _PC_MAC_PRESENT:
1106 * If MAC is enabled, devfs automatically supports
1107 * trivial non-persistant label storage.
1115 return (vop_stdpathconf(ap));
1122 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td)
1130 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1132 return (poll_no_poll(events));
1133 error = dsw->d_poll(dev, events, td);
1135 dev_relthread(dev, ref);
1140 * Print out the contents of a special device vnode.
1143 devfs_print(struct vop_print_args *ap)
1146 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev));
1152 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td)
1155 int ioflag, error, ref, resid;
1160 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1163 resid = uio->uio_resid;
1164 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT);
1165 if (ioflag & O_DIRECT)
1166 ioflag |= IO_DIRECT;
1168 if ((flags & FOF_OFFSET) == 0)
1169 uio->uio_offset = fp->f_offset;
1171 error = dsw->d_read(dev, uio, ioflag);
1172 if (uio->uio_resid != resid || (error == 0 && resid != 0))
1173 vfs_timestamp(&dev->si_atime);
1175 dev_relthread(dev, ref);
1177 if ((flags & FOF_OFFSET) == 0)
1178 fp->f_offset = uio->uio_offset;
1179 fp->f_nextoff = uio->uio_offset;
1184 devfs_readdir(struct vop_readdir_args *ap)
1189 struct devfs_dirent *dd;
1190 struct devfs_dirent *de;
1191 struct devfs_mount *dmp;
1193 int *tmp_ncookies = NULL;
1195 if (ap->a_vp->v_type != VDIR)
1199 if (uio->uio_offset < 0)
1203 * XXX: This is a temporary hack to get around this filesystem not
1204 * supporting cookies. We store the location of the ncookies pointer
1205 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent()
1206 * and set the number of cookies to 0. We then set the pointer to
1207 * NULL so that vfs_read_dirent doesn't try to call realloc() on
1208 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies
1209 * pointer to its original location before returning to the caller.
1211 if (ap->a_ncookies != NULL) {
1212 tmp_ncookies = ap->a_ncookies;
1213 *ap->a_ncookies = 0;
1214 ap->a_ncookies = NULL;
1217 dmp = VFSTODEVFS(ap->a_vp->v_mount);
1218 if (devfs_populate_vp(ap->a_vp) != 0) {
1219 if (tmp_ncookies != NULL)
1220 ap->a_ncookies = tmp_ncookies;
1224 de = ap->a_vp->v_data;
1226 TAILQ_FOREACH(dd, &de->de_dlist, de_list) {
1227 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__));
1228 if (dd->de_flags & (DE_COVERED | DE_WHITEOUT))
1230 if (devfs_prison_check(dd, uio->uio_td))
1232 if (dd->de_dirent->d_type == DT_DIR)
1237 if (dp->d_reclen > uio->uio_resid)
1239 dp->d_fileno = de->de_inode;
1240 if (off >= uio->uio_offset) {
1241 error = vfs_read_dirent(ap, dp, off);
1245 off += dp->d_reclen;
1247 sx_xunlock(&dmp->dm_lock);
1248 uio->uio_offset = off;
1251 * Restore ap->a_ncookies if it wasn't originally NULL in the first
1254 if (tmp_ncookies != NULL)
1255 ap->a_ncookies = tmp_ncookies;
1261 devfs_readlink(struct vop_readlink_args *ap)
1263 struct devfs_dirent *de;
1265 de = ap->a_vp->v_data;
1266 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio));
1270 devfs_reclaim(struct vop_reclaim_args *ap)
1272 struct vnode *vp = ap->a_vp;
1273 struct devfs_dirent *de;
1276 mtx_lock(&devfs_de_interlock);
1279 de->de_vnode = NULL;
1282 mtx_unlock(&devfs_de_interlock);
1284 vnode_destroy_vobject(vp);
1297 dev->si_usecount -= vp->v_usecount;
1305 devfs_remove(struct vop_remove_args *ap)
1307 struct vnode *dvp = ap->a_dvp;
1308 struct vnode *vp = ap->a_vp;
1309 struct devfs_dirent *dd;
1310 struct devfs_dirent *de, *de_covered;
1311 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount);
1313 ASSERT_VOP_ELOCKED(dvp, "devfs_remove");
1314 ASSERT_VOP_ELOCKED(vp, "devfs_remove");
1316 sx_xlock(&dmp->dm_lock);
1317 dd = ap->a_dvp->v_data;
1319 if (de->de_cdp == NULL) {
1320 TAILQ_REMOVE(&dd->de_dlist, de, de_list);
1321 if (de->de_dirent->d_type == DT_LNK) {
1322 de_covered = devfs_find(dd, de->de_dirent->d_name,
1323 de->de_dirent->d_namlen, 0);
1324 if (de_covered != NULL)
1325 de_covered->de_flags &= ~DE_COVERED;
1327 /* We need to unlock dvp because devfs_delete() may lock it. */
1331 devfs_delete(dmp, de, 0);
1332 sx_xunlock(&dmp->dm_lock);
1334 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1335 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1337 de->de_flags |= DE_WHITEOUT;
1338 sx_xunlock(&dmp->dm_lock);
1344 * Revoke is called on a tty when a terminal session ends. The vnode
1345 * is orphaned by setting v_op to deadfs so we need to let go of it
1346 * as well so that we create a new one next time around.
1350 devfs_revoke(struct vop_revoke_args *ap)
1352 struct vnode *vp = ap->a_vp, *vp2;
1354 struct cdev_priv *cdp;
1355 struct devfs_dirent *de;
1358 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL"));
1361 cdp = cdev2priv(dev);
1374 mtx_lock(&devfs_de_interlock);
1377 for (i = 0; i <= cdp->cdp_maxdirent; i++) {
1378 de = cdp->cdp_dirents[i];
1386 mtx_unlock(&devfs_de_interlock);
1387 if (vget(vp2, LK_EXCLUSIVE | LK_INTERLOCK,
1401 mtx_unlock(&devfs_de_interlock);
1406 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) {
1407 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list);
1409 dev_rel(&cdp->cdp_c);
1413 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1418 devfs_rioctl(struct vop_ioctl_args *ap)
1421 struct devfs_mount *dmp;
1425 vn_lock(vp, LK_SHARED | LK_RETRY);
1426 if (vp->v_iflag & VI_DOOMED) {
1430 dmp = VFSTODEVFS(vp->v_mount);
1431 sx_xlock(&dmp->dm_lock);
1433 DEVFS_DMP_HOLD(dmp);
1434 devfs_populate(dmp);
1435 if (DEVFS_DMP_DROP(dmp)) {
1436 sx_xunlock(&dmp->dm_lock);
1437 devfs_unmount_final(dmp);
1440 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td);
1441 sx_xunlock(&dmp->dm_lock);
1446 devfs_rread(struct vop_read_args *ap)
1449 if (ap->a_vp->v_type != VDIR)
1451 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL));
1455 devfs_setattr(struct vop_setattr_args *ap)
1457 struct devfs_dirent *de;
1468 if ((vap->va_type != VNON) ||
1469 (vap->va_nlink != VNOVAL) ||
1470 (vap->va_fsid != VNOVAL) ||
1471 (vap->va_fileid != VNOVAL) ||
1472 (vap->va_blocksize != VNOVAL) ||
1473 (vap->va_flags != VNOVAL && vap->va_flags != 0) ||
1474 (vap->va_rdev != VNOVAL) ||
1475 ((int)vap->va_bytes != VNOVAL) ||
1476 (vap->va_gen != VNOVAL)) {
1481 if (vp->v_type == VDIR)
1485 if (vap->va_uid == (uid_t)VNOVAL)
1489 if (vap->va_gid == (gid_t)VNOVAL)
1493 if (uid != de->de_uid || gid != de->de_gid) {
1494 if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid ||
1495 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) {
1496 error = priv_check(td, PRIV_VFS_CHOWN);
1505 if (vap->va_mode != (mode_t)VNOVAL) {
1506 if (ap->a_cred->cr_uid != de->de_uid) {
1507 error = priv_check(td, PRIV_VFS_ADMIN);
1511 de->de_mode = vap->va_mode;
1515 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
1516 /* See the comment in ufs_vnops::ufs_setattr(). */
1517 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)) &&
1518 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
1519 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, td))))
1521 if (vap->va_atime.tv_sec != VNOVAL) {
1522 if (vp->v_type == VCHR)
1523 vp->v_rdev->si_atime = vap->va_atime;
1525 de->de_atime = vap->va_atime;
1527 if (vap->va_mtime.tv_sec != VNOVAL) {
1528 if (vp->v_type == VCHR)
1529 vp->v_rdev->si_mtime = vap->va_mtime;
1531 de->de_mtime = vap->va_mtime;
1537 if (vp->v_type == VCHR)
1538 vfs_timestamp(&vp->v_rdev->si_ctime);
1540 vfs_timestamp(&de->de_mtime);
1547 devfs_setlabel(struct vop_setlabel_args *ap)
1550 struct devfs_dirent *de;
1555 mac_vnode_relabel(ap->a_cred, vp, ap->a_label);
1556 mac_devfs_update(vp->v_mount, de, vp);
1563 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td)
1566 return (vnops.fo_stat(fp, sb, cred, td));
1570 devfs_symlink(struct vop_symlink_args *ap)
1573 struct devfs_dirent *dd;
1574 struct devfs_dirent *de, *de_covered, *de_dotdot;
1575 struct devfs_mount *dmp;
1577 error = priv_check(curthread, PRIV_DEVFS_SYMLINK);
1580 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
1581 if (devfs_populate_vp(ap->a_dvp) != 0)
1584 dd = ap->a_dvp->v_data;
1585 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen);
1586 de->de_flags = DE_USER;
1590 de->de_inode = alloc_unr(devfs_inos);
1592 de->de_dirent->d_type = DT_LNK;
1593 i = strlen(ap->a_target) + 1;
1594 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK);
1595 bcopy(ap->a_target, de->de_symlink, i);
1597 mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de);
1599 de_covered = devfs_find(dd, de->de_dirent->d_name,
1600 de->de_dirent->d_namlen, 0);
1601 if (de_covered != NULL) {
1602 if ((de_covered->de_flags & DE_USER) != 0) {
1603 devfs_delete(dmp, de, DEVFS_DEL_NORECURSE);
1604 sx_xunlock(&dmp->dm_lock);
1607 KASSERT((de_covered->de_flags & DE_COVERED) == 0,
1608 ("devfs_symlink: entry %p already covered", de_covered));
1609 de_covered->de_flags |= DE_COVERED;
1612 de_dotdot = TAILQ_FIRST(&dd->de_dlist); /* "." */
1613 de_dotdot = TAILQ_NEXT(de_dotdot, de_list); /* ".." */
1614 TAILQ_INSERT_AFTER(&dd->de_dlist, de_dotdot, de, de_list);
1615 devfs_dir_ref_de(dmp, dd);
1616 devfs_rules_apply(dmp, de);
1618 return (devfs_allocv(de, ap->a_dvp->v_mount, LK_EXCLUSIVE, ap->a_vpp));
1622 devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td)
1625 return (vnops.fo_truncate(fp, length, cred, td));
1630 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td)
1633 int error, ioflag, ref, resid;
1638 error = devfs_fp_check(fp, &dev, &dsw, &ref);
1641 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td));
1642 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC);
1643 if (ioflag & O_DIRECT)
1644 ioflag |= IO_DIRECT;
1645 if ((flags & FOF_OFFSET) == 0)
1646 uio->uio_offset = fp->f_offset;
1648 resid = uio->uio_resid;
1650 error = dsw->d_write(dev, uio, ioflag);
1651 if (uio->uio_resid != resid || (error == 0 && resid != 0)) {
1652 vfs_timestamp(&dev->si_ctime);
1653 dev->si_mtime = dev->si_ctime;
1656 dev_relthread(dev, ref);
1658 if ((flags & FOF_OFFSET) == 0)
1659 fp->f_offset = uio->uio_offset;
1660 fp->f_nextoff = uio->uio_offset;
1665 dev2udev(struct cdev *x)
1669 return (cdev2priv(x)->cdp_inode);
1672 static struct fileops devfs_ops_f = {
1673 .fo_read = devfs_read_f,
1674 .fo_write = devfs_write_f,
1675 .fo_truncate = devfs_truncate_f,
1676 .fo_ioctl = devfs_ioctl_f,
1677 .fo_poll = devfs_poll_f,
1678 .fo_kqfilter = devfs_kqfilter_f,
1679 .fo_stat = devfs_stat_f,
1680 .fo_close = devfs_close_f,
1681 .fo_chmod = vn_chmod,
1682 .fo_chown = vn_chown,
1683 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE
1686 static struct vop_vector devfs_vnodeops = {
1687 .vop_default = &default_vnodeops,
1689 .vop_access = devfs_access,
1690 .vop_getattr = devfs_getattr,
1691 .vop_ioctl = devfs_rioctl,
1692 .vop_lookup = devfs_lookup,
1693 .vop_mknod = devfs_mknod,
1694 .vop_pathconf = devfs_pathconf,
1695 .vop_read = devfs_rread,
1696 .vop_readdir = devfs_readdir,
1697 .vop_readlink = devfs_readlink,
1698 .vop_reclaim = devfs_reclaim,
1699 .vop_remove = devfs_remove,
1700 .vop_revoke = devfs_revoke,
1701 .vop_setattr = devfs_setattr,
1703 .vop_setlabel = devfs_setlabel,
1705 .vop_symlink = devfs_symlink,
1706 .vop_vptocnp = devfs_vptocnp,
1709 static struct vop_vector devfs_specops = {
1710 .vop_default = &default_vnodeops,
1712 .vop_access = devfs_access,
1713 .vop_bmap = VOP_PANIC,
1714 .vop_close = devfs_close,
1715 .vop_create = VOP_PANIC,
1716 .vop_fsync = devfs_fsync,
1717 .vop_getattr = devfs_getattr,
1718 .vop_link = VOP_PANIC,
1719 .vop_mkdir = VOP_PANIC,
1720 .vop_mknod = VOP_PANIC,
1721 .vop_open = devfs_open,
1722 .vop_pathconf = devfs_pathconf,
1723 .vop_print = devfs_print,
1724 .vop_read = VOP_PANIC,
1725 .vop_readdir = VOP_PANIC,
1726 .vop_readlink = VOP_PANIC,
1727 .vop_reallocblks = VOP_PANIC,
1728 .vop_reclaim = devfs_reclaim,
1729 .vop_remove = devfs_remove,
1730 .vop_rename = VOP_PANIC,
1731 .vop_revoke = devfs_revoke,
1732 .vop_rmdir = VOP_PANIC,
1733 .vop_setattr = devfs_setattr,
1735 .vop_setlabel = devfs_setlabel,
1737 .vop_strategy = VOP_PANIC,
1738 .vop_symlink = VOP_PANIC,
1739 .vop_vptocnp = devfs_vptocnp,
1740 .vop_write = VOP_PANIC,
1744 * Our calling convention to the device drivers used to be that we passed
1745 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_
1746 * flags instead since that's what open(), close() and ioctl() takes and
1747 * we don't really want vnode.h in device drivers.
1748 * We solved the source compatibility by redefining some vnode flags to
1749 * be the same as the fcntl ones and by sending down the bitwise OR of
1750 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody
1751 * pulls the rug out under this.
1753 CTASSERT(O_NONBLOCK == IO_NDELAY);
1754 CTASSERT(O_FSYNC == IO_SYNC);