2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Poul-Henning Kamp. 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
39 * remove empty directories
40 * mknod: hunt down DE_DELETED, compare name, reinstantiate.
44 #include <opt_devfs.h>
48 #include <sys/param.h>
49 #include <sys/systm.h>
51 #include <sys/dirent.h>
52 #include <sys/kernel.h>
55 #include <sys/malloc.h>
56 #include <sys/mount.h>
57 #include <sys/namei.h>
60 #include <sys/unistd.h>
61 #include <sys/vnode.h>
63 #include <fs/devfs/devfs.h>
65 static int devfs_access(struct vop_access_args *ap);
66 static int devfs_getattr(struct vop_getattr_args *ap);
67 static int devfs_ioctl(struct vop_ioctl_args *ap);
68 static int devfs_lookupx(struct vop_lookup_args *ap);
69 static int devfs_mknod(struct vop_mknod_args *ap);
70 static int devfs_pathconf(struct vop_pathconf_args *ap);
71 static int devfs_read(struct vop_read_args *ap);
72 static int devfs_readdir(struct vop_readdir_args *ap);
73 static int devfs_readlink(struct vop_readlink_args *ap);
74 static int devfs_reclaim(struct vop_reclaim_args *ap);
76 static int devfs_refreshlabel(struct vop_refreshlabel_args *ap);
78 static int devfs_remove(struct vop_remove_args *ap);
79 static int devfs_revoke(struct vop_revoke_args *ap);
80 static int devfs_setattr(struct vop_setattr_args *ap);
82 static int devfs_setlabel(struct vop_setlabel_args *ap);
84 static int devfs_symlink(struct vop_symlink_args *ap);
86 static vop_t **devfs_vnodeop_p;
87 static vop_t **devfs_specop_p;
90 * Construct the fully qualified path name relative to the mountpoint
93 devfs_fqpn(char *buf, struct vnode *dvp, struct componentname *cnp)
96 struct devfs_dirent *de, *dd;
97 struct devfs_mount *dmp;
99 dmp = VFSTODEVFS(dvp->v_mount);
103 i -= cnp->cn_namelen;
106 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen);
108 while (de != dmp->dm_basedir) {
113 i -= de->de_dirent->d_namlen;
116 bcopy(de->de_dirent->d_name, buf + i,
117 de->de_dirent->d_namlen);
118 de = TAILQ_FIRST(&de->de_dlist); /* "." */
119 de = TAILQ_NEXT(de, de_list); /* ".." */
126 devfs_allocv(struct devfs_dirent *de, struct mount *mp, struct vnode **vpp, struct thread *td)
133 td = curthread; /* XXX */
137 if (vget(vp, LK_EXCLUSIVE, td ? td : curthread))
142 if (de->de_dirent->d_type == DT_CHR) {
143 dev = *devfs_itod(de->de_inode);
149 error = getnewvnode("devfs", mp, devfs_vnodeop_p, &vp);
151 printf("devfs_allocv: failed to allocate new vnode\n");
155 if (de->de_dirent->d_type == DT_CHR) {
157 vp = addaliasu(vp, dev->si_udev);
158 vp->v_op = devfs_specop_p;
159 } else if (de->de_dirent->d_type == DT_DIR) {
161 } else if (de->de_dirent->d_type == DT_LNK) {
168 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
170 mac_associate_vnode_devfs(mp, de, vp);
178 struct vop_access_args /* {
181 struct ucred *a_cred;
185 struct vnode *vp = ap->a_vp;
186 struct devfs_dirent *de;
189 if (vp->v_type == VDIR)
192 return (vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid,
193 ap->a_mode, ap->a_cred, NULL));
198 struct vop_getattr_args /* {
201 struct ucred *a_cred;
205 struct vnode *vp = ap->a_vp;
206 struct vattr *vap = ap->a_vap;
208 struct devfs_dirent *de;
212 if (vp->v_type == VDIR)
214 bzero((caddr_t) vap, sizeof(*vap));
216 vap->va_uid = de->de_uid;
217 vap->va_gid = de->de_gid;
218 vap->va_mode = de->de_mode;
219 if (vp->v_type == VLNK)
220 vap->va_size = de->de_dirent->d_namlen;
221 else if (vp->v_type == VDIR)
222 vap->va_size = vap->va_bytes = DEV_BSIZE;
225 if (vp->v_type != VDIR)
227 vap->va_blocksize = DEV_BSIZE;
228 vap->va_type = vp->v_type;
232 if ((aa).tv_sec == 0) { \
233 (aa).tv_sec = boottime.tv_sec; \
234 (aa).tv_nsec = boottime.tv_usec * 1000; \
238 if (vp->v_type != VCHR) {
240 vap->va_atime = de->de_atime;
242 vap->va_mtime = de->de_mtime;
244 vap->va_ctime = de->de_ctime;
248 vap->va_atime = dev->si_atime;
250 vap->va_mtime = dev->si_mtime;
252 vap->va_ctime = dev->si_ctime;
253 vap->va_rdev = dev->si_udev;
257 vap->va_nlink = de->de_links;
258 vap->va_fileid = de->de_inode;
265 struct vop_ioctl_args /* {
270 struct ucred *a_cred;
276 error = devfs_rules_ioctl(ap->a_vp->v_mount, ap->a_command, ap->a_data,
283 struct vop_lookup_args /* {
284 struct vnode * a_dvp;
285 struct vnode ** a_vpp;
286 struct componentname * a_cnp;
289 struct componentname *cnp;
290 struct vnode *dvp, **vpp;
292 struct devfs_dirent *de, *dd;
293 struct devfs_mount *dmp;
295 int error, cloned, flags, nameiop;
296 char specname[SPECNAMELEN + 1], *pname;
301 pname = cnp->cn_nameptr;
303 flags = cnp->cn_flags;
304 nameiop = cnp->cn_nameiop;
305 dmp = VFSTODEVFS(dvp->v_mount);
310 cnp->cn_flags &= ~PDIRUNLOCK;
312 if ((flags & ISLASTCN) && nameiop == RENAME)
315 if (dvp->v_type != VDIR)
318 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT))
321 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td);
325 if (cnp->cn_namelen == 1 && *pname == '.') {
326 if ((flags & ISLASTCN) && nameiop != LOOKUP)
333 if (flags & ISDOTDOT) {
334 if ((flags & ISLASTCN) && nameiop != LOOKUP)
336 VOP_UNLOCK(dvp, 0, td);
337 cnp->cn_flags |= PDIRUNLOCK;
338 de = TAILQ_FIRST(&dd->de_dlist); /* "." */
339 de = TAILQ_NEXT(de, de_list); /* ".." */
341 error = devfs_allocv(de, dvp->v_mount, vpp, td);
342 if (error || ((flags & LOCKPARENT) && (flags & ISLASTCN))) {
343 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
344 cnp->cn_flags &= ~PDIRUNLOCK;
351 TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
352 if (cnp->cn_namelen != de->de_dirent->d_namlen)
354 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name,
355 de->de_dirent->d_namlen) != 0)
357 if (de->de_flags & DE_WHITEOUT)
362 if (nameiop == DELETE)
366 * OK, we didn't have an entry for the name we were asked for
367 * so we try to see if anybody can create it on demand.
369 pname = devfs_fqpn(specname, dvp, cnp);
374 EVENTHANDLER_INVOKE(dev_clone, pname, strlen(pname), &cdev);
381 TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
382 cpdev = devfs_itod(de->de_inode);
383 if (cpdev != NULL && cdev == *cpdev)
390 if ((nameiop == CREATE || nameiop == RENAME) &&
391 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) {
392 cnp->cn_flags |= SAVENAME;
393 if (!(flags & LOCKPARENT)) {
394 VOP_UNLOCK(dvp, 0, td);
395 cnp->cn_flags |= PDIRUNLOCK;
397 return (EJUSTRETURN);
404 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) {
405 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
413 error = devfs_allocv(de, dvp->v_mount, vpp, td);
416 if (!(flags & LOCKPARENT)) {
417 VOP_UNLOCK(dvp, 0, td);
418 cnp->cn_flags |= PDIRUNLOCK;
422 error = devfs_allocv(de, dvp->v_mount, vpp, td);
425 if (!(flags & LOCKPARENT) || !(flags & ISLASTCN)) {
426 VOP_UNLOCK(dvp, 0, td);
427 cnp->cn_flags |= PDIRUNLOCK;
433 devfs_lookup(struct vop_lookup_args *ap)
436 struct devfs_mount *dmp;
438 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
439 lockmgr(&dmp->dm_lock, LK_SHARED, 0, curthread);
440 j = devfs_lookupx(ap);
441 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
446 devfs_mknod(struct vop_mknod_args *ap)
448 struct vop_mknod_args {
449 struct vnodeop_desc *a_desc;
451 struct vnode **a_vpp;
452 struct componentname *a_cnp;
457 struct componentname *cnp;
458 struct vnode *dvp, **vpp;
460 struct devfs_dirent *dd, *de;
461 struct devfs_mount *dmp;
462 int cloned, flags, nameiop;
466 dmp = VFSTODEVFS(dvp->v_mount);
467 lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, curthread);
472 flags = cnp->cn_flags;
473 nameiop = cnp->cn_nameiop;
478 TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
479 if (cnp->cn_namelen != de->de_dirent->d_namlen)
481 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name,
482 de->de_dirent->d_namlen) != 0)
484 if (de->de_flags & DE_WHITEOUT)
490 de->de_flags &= ~DE_WHITEOUT;
491 error = devfs_allocv(de, dvp->v_mount, vpp, td);
493 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
500 struct vop_pathconf_args /* {
507 switch (ap->a_name) {
509 *ap->a_retval = NAME_MAX;
512 *ap->a_retval = PATH_MAX;
514 case _PC_MAC_PRESENT:
517 * If MAC is enabled, devfs automatically supports
518 * trivial non-persistant label storage.
526 return (vop_stdpathconf(ap));
533 struct vop_read_args /* {
537 struct ucred *a_cred;
541 if (ap->a_vp->v_type != VDIR)
543 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL));
548 struct vop_readdir_args /* {
551 struct ucred *a_cred;
560 struct devfs_dirent *dd;
561 struct devfs_dirent *de;
562 struct devfs_mount *dmp;
565 u_long *cookiebuf, *cookiep;
566 struct dirent *dps, *dpe;
568 if (ap->a_vp->v_type != VDIR)
572 if (uio->uio_offset < 0)
575 dmp = VFSTODEVFS(ap->a_vp->v_mount);
576 lockmgr(&dmp->dm_lock, LK_SHARED, 0, curthread);
579 de = ap->a_vp->v_data;
581 oldoff = uio->uio_offset;
582 TAILQ_FOREACH(dd, &de->de_dlist, de_list) {
583 if (dd->de_flags & DE_WHITEOUT)
585 if (dd->de_dirent->d_type == DT_DIR)
590 if (dp->d_reclen > uio->uio_resid)
592 dp->d_fileno = de->de_inode;
593 if (off >= uio->uio_offset) {
595 error = uiomove((caddr_t)dp, dp->d_reclen, uio);
601 if( !error && ap->a_ncookies != NULL && ap->a_cookies != NULL ) {
602 MALLOC(cookiebuf, u_long *, ncookies * sizeof(u_long),
605 dps = (struct dirent *)((char *)uio->uio_iov->iov_base -
606 (uio->uio_offset - oldoff));
607 dpe = (struct dirent *) uio->uio_iov->iov_base;
610 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) {
611 oldoff += dp->d_reclen;
612 *cookiep++ = (u_long) oldoff;
614 *ap->a_ncookies = ncookies;
615 *ap->a_cookies = cookiebuf;
617 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
618 uio->uio_offset = off;
624 struct vop_readlink_args /* {
627 struct ucred *a_cead;
631 struct devfs_dirent *de;
633 de = ap->a_vp->v_data;
634 error = uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio);
640 struct vop_reclaim_args /* {
644 struct vnode *vp = ap->a_vp;
645 struct devfs_dirent *de;
652 if (vp->v_rdev != NODEV && vp->v_rdev != NULL) {
654 if ((vp->v_rdev->si_flags & SI_CHEAPCLONE) && i == 0 &&
655 (vp->v_rdev->si_flags & SI_NAMED))
656 destroy_dev(vp->v_rdev);
663 devfs_refreshlabel(ap)
664 struct vop_refreshlabel_args /* {
666 struct ucred *a_cred;
670 /* Labels are always in sync. */
677 struct vop_remove_args /* {
680 struct componentname *a_cnp;
683 struct vnode *vp = ap->a_vp;
684 struct devfs_dirent *dd;
685 struct devfs_dirent *de;
686 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount);
688 lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, curthread);
689 dd = ap->a_dvp->v_data;
691 if (de->de_dirent->d_type == DT_LNK) {
692 TAILQ_REMOVE(&dd->de_dlist, de, de_list);
694 de->de_vnode->v_data = NULL;
696 mac_destroy_devfsdirent(de);
700 de->de_flags |= DE_WHITEOUT;
702 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
707 * Revoke is called on a tty when a terminal session ends. The vnode
708 * is orphaned by setting v_op to deadfs so we need to let go of it
709 * as well so that we create a new one next time around.
713 struct vop_revoke_args /* {
718 struct vnode *vp = ap->a_vp;
719 struct devfs_dirent *de;
729 struct vop_setattr_args /* {
732 struct ucred *a_cred;
736 struct devfs_dirent *de;
745 if ((vap->va_type != VNON) ||
746 (vap->va_nlink != VNOVAL) ||
747 (vap->va_fsid != VNOVAL) ||
748 (vap->va_fileid != VNOVAL) ||
749 (vap->va_blocksize != VNOVAL) ||
750 (vap->va_flags != VNOVAL && vap->va_flags != 0) ||
751 (vap->va_rdev != VNOVAL) ||
752 ((int)vap->va_bytes != VNOVAL) ||
753 (vap->va_gen != VNOVAL)) {
758 if (vp->v_type == VDIR)
762 if (vap->va_uid == (uid_t)VNOVAL)
766 if (vap->va_gid == (gid_t)VNOVAL)
770 if (uid != de->de_uid || gid != de->de_gid) {
771 if (((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid ||
772 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) &&
773 (error = suser_cred(ap->a_td->td_ucred, PRISON_ROOT)) != 0)
780 if (vap->va_mode != (mode_t)VNOVAL) {
781 if ((ap->a_cred->cr_uid != de->de_uid) &&
782 (error = suser_cred(ap->a_td->td_ucred, PRISON_ROOT)))
784 de->de_mode = vap->va_mode;
788 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
789 /* See the comment in ufs_vnops::ufs_setattr(). */
790 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, ap->a_td)) &&
791 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
792 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, ap->a_td))))
794 if (vap->va_atime.tv_sec != VNOVAL) {
795 if (vp->v_type == VCHR)
796 vp->v_rdev->si_atime = vap->va_atime;
798 de->de_atime = vap->va_atime;
800 if (vap->va_mtime.tv_sec != VNOVAL) {
801 if (vp->v_type == VCHR)
802 vp->v_rdev->si_mtime = vap->va_mtime;
804 de->de_mtime = vap->va_mtime;
810 if (vp->v_type == VCHR)
811 vfs_timestamp(&vp->v_rdev->si_ctime);
813 vfs_timestamp(&de->de_mtime);
821 struct vop_setlabel_args /* {
824 struct ucred *a_cred;
829 struct devfs_dirent *de;
834 mac_relabel_vnode(ap->a_cred, vp, ap->a_label);
835 mac_update_devfsdirent(de, vp);
843 struct vop_symlink_args /* {
845 struct vnode **a_vpp;
846 struct componentname *a_cnp;
852 struct devfs_dirent *dd;
853 struct devfs_dirent *de;
854 struct devfs_mount *dmp;
856 error = suser(ap->a_cnp->cn_thread);
859 dmp = VFSTODEVFS(ap->a_dvp->v_mount);
860 dd = ap->a_dvp->v_data;
861 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen);
865 de->de_inode = dmp->dm_inode++;
866 de->de_dirent->d_type = DT_LNK;
867 i = strlen(ap->a_target) + 1;
868 MALLOC(de->de_symlink, char *, i, M_DEVFS, M_WAITOK);
869 bcopy(ap->a_target, de->de_symlink, i);
870 lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, curthread);
872 mac_create_devfs_symlink(ap->a_cnp->cn_cred, dd, de);
874 TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list);
875 devfs_allocv(de, ap->a_dvp->v_mount, ap->a_vpp, 0);
876 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
880 static struct vnodeopv_entry_desc devfs_vnodeop_entries[] = {
881 { &vop_default_desc, (vop_t *) vop_defaultop },
882 { &vop_access_desc, (vop_t *) devfs_access },
883 { &vop_getattr_desc, (vop_t *) devfs_getattr },
884 { &vop_ioctl_desc, (vop_t *) devfs_ioctl },
885 { &vop_islocked_desc, (vop_t *) vop_stdislocked },
886 { &vop_lock_desc, (vop_t *) vop_stdlock },
887 { &vop_lookup_desc, (vop_t *) devfs_lookup },
888 { &vop_mknod_desc, (vop_t *) devfs_mknod },
889 { &vop_pathconf_desc, (vop_t *) devfs_pathconf },
890 { &vop_print_desc, (vop_t *) vop_null },
891 { &vop_read_desc, (vop_t *) devfs_read },
892 { &vop_readdir_desc, (vop_t *) devfs_readdir },
893 { &vop_readlink_desc, (vop_t *) devfs_readlink },
894 { &vop_reclaim_desc, (vop_t *) devfs_reclaim },
895 { &vop_remove_desc, (vop_t *) devfs_remove },
897 { &vop_refreshlabel_desc, (vop_t *) devfs_refreshlabel },
899 { &vop_revoke_desc, (vop_t *) devfs_revoke },
900 { &vop_setattr_desc, (vop_t *) devfs_setattr },
902 { &vop_setlabel_desc, (vop_t *) devfs_setlabel },
904 { &vop_symlink_desc, (vop_t *) devfs_symlink },
905 { &vop_unlock_desc, (vop_t *) vop_stdunlock },
908 static struct vnodeopv_desc devfs_vnodeop_opv_desc =
909 { &devfs_vnodeop_p, devfs_vnodeop_entries };
911 VNODEOP_SET(devfs_vnodeop_opv_desc);
913 static struct vnodeopv_entry_desc devfs_specop_entries[] = {
914 { &vop_default_desc, (vop_t *) spec_vnoperate },
915 { &vop_access_desc, (vop_t *) devfs_access },
916 { &vop_getattr_desc, (vop_t *) devfs_getattr },
917 { &vop_islocked_desc, (vop_t *) vop_stdislocked },
918 { &vop_lock_desc, (vop_t *) vop_stdlock },
919 { &vop_pathconf_desc, (vop_t *) devfs_pathconf },
920 { &vop_print_desc, (vop_t *) vop_null },
921 { &vop_reclaim_desc, (vop_t *) devfs_reclaim },
923 { &vop_refreshlabel_desc, (vop_t *) devfs_refreshlabel },
925 { &vop_remove_desc, (vop_t *) devfs_remove },
926 { &vop_revoke_desc, (vop_t *) devfs_revoke },
927 { &vop_setattr_desc, (vop_t *) devfs_setattr },
929 { &vop_setlabel_desc, (vop_t *) devfs_setlabel },
931 { &vop_unlock_desc, (vop_t *) vop_stdunlock },
934 static struct vnodeopv_desc devfs_specop_opv_desc =
935 { &devfs_specop_p, devfs_specop_entries };
937 VNODEOP_SET(devfs_specop_opv_desc);