3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley
6 * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension
7 * Support code is derived from software contributed to Berkeley
8 * by Atsushi Murai (amurai@spec.co.jp).
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. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)cd9660_vfsops.c 8.18 (Berkeley) 5/22/95
39 * $FreeBSD: src/sys/isofs/cd9660/cd9660_vfsops.c,v 1.74.2.7 2002/04/08 09:39:29 bde Exp $
40 * $DragonFly: src/sys/vfs/isofs/cd9660/cd9660_vfsops.c,v 1.46 2008/09/17 21:44:23 dillon Exp $
43 #include <sys/param.h>
44 #include <sys/systm.h>
47 #include <sys/nlookup.h>
48 #include <sys/kernel.h>
49 #include <sys/vnode.h>
50 #include <sys/mount.h>
54 #include <sys/fcntl.h>
55 #include <sys/malloc.h>
57 #include <sys/syslog.h>
58 #include <sys/iconv.h>
60 #include <vm/vm_zone.h>
66 #include "cd9660_node.h"
67 #include "cd9660_mount.h"
69 extern struct vop_ops cd9660_vnode_vops;
70 extern struct vop_ops cd9660_spec_vops;
71 extern struct vop_ops cd9660_fifo_vops;
73 MALLOC_DEFINE(M_ISOFSMNT, "ISOFS mount", "ISOFS mount structure");
74 MALLOC_DEFINE(M_ISOFSNODE, "ISOFS node", "ISOFS vnode private part");
76 struct iconv_functions *cd9660_iconv = NULL;
78 static int cd9660_mount (struct mount *, char *, caddr_t, struct ucred *);
79 static int cd9660_unmount (struct mount *, int);
80 static int cd9660_root (struct mount *, struct vnode **);
81 static int cd9660_statfs (struct mount *, struct statfs *, struct ucred *);
82 static int cd9660_vget (struct mount *, struct vnode *, ino_t, struct vnode **);
83 static int cd9660_fhtovp (struct mount *, struct vnode *rootvp,
84 struct fid *, struct vnode **);
85 static int cd9660_checkexp (struct mount *, struct sockaddr *,
86 int *, struct ucred **);
87 static int cd9660_vptofh (struct vnode *, struct fid *);
89 static struct vfsops cd9660_vfsops = {
90 .vfs_mount = cd9660_mount,
91 .vfs_unmount = cd9660_unmount,
92 .vfs_root = cd9660_root,
93 .vfs_statfs = cd9660_statfs,
94 .vfs_sync = vfs_stdsync,
95 .vfs_vget = cd9660_vget,
96 .vfs_fhtovp = cd9660_fhtovp,
97 .vfs_checkexp = cd9660_checkexp,
98 .vfs_vptofh = cd9660_vptofh,
99 .vfs_init = cd9660_init,
100 .vfs_uninit = cd9660_uninit,
102 VFS_SET(cd9660_vfsops, cd9660, VFCF_READONLY);
103 MODULE_VERSION(cd9660, 1);
107 * Called by vfs_mountroot when iso is going to be mounted as root.
110 static int iso_get_ssector (cdev_t dev);
111 static int iso_mountfs (struct vnode *devvp, struct mount *mp,
112 struct iso_args *argp);
115 * Try to find the start of the last data track on this CD-ROM. This
116 * is used to mount the last session of a multi-session CD. Bail out
117 * and return 0 if we fail, this is always a safe bet.
120 iso_get_ssector(cdev_t dev)
122 struct ioc_toc_header h;
123 struct ioc_read_toc_single_entry t;
126 if (dev_dioctl(dev, CDIOREADTOCHEADER, (caddr_t)&h, FREAD,
127 proc0.p_ucred, NULL) != 0)
130 for (i = h.ending_track; i >= 0; i--) {
131 t.address_format = CD_LBA_FORMAT;
133 if (dev_dioctl(dev, CDIOREADTOCENTRY, (caddr_t)&t, FREAD,
134 proc0.p_ucred, NULL) != 0) {
137 if ((t.entry.control & 4) != 0)
138 /* found a data track */
145 return ntohl(t.entry.addr.lba);
149 iso_mountroot(struct mount *mp)
151 struct iso_args args;
152 struct vnode *rootvp;
155 if ((error = bdevvp(rootdev, &rootvp))) {
156 kprintf("iso_mountroot: can't find rootvp\n");
159 args.flags = ISOFSMNT_ROOT;
161 vn_lock(rootvp, LK_EXCLUSIVE | LK_RETRY);
162 error = VOP_OPEN(rootvp, FREAD, FSCRED, NULL);
167 args.ssector = iso_get_ssector(rootdev);
169 VOP_CLOSE(rootvp, FREAD);
172 kprintf("iso_mountroot(): using session at block %d\n",
174 if ((error = iso_mountfs(rootvp, mp, &args)) != 0)
177 cd9660_statfs(mp, &mp->mnt_stat, proc0.p_ucred);
187 cd9660_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
190 struct iso_args args;
194 struct iso_mnt *imp = 0;
195 struct nlookupdata nd;
197 if ((mp->mnt_flag & (MNT_ROOTFS|MNT_UPDATE)) == MNT_ROOTFS) {
198 return (iso_mountroot(mp));
200 if ((error = copyin(data, (caddr_t)&args, sizeof (struct iso_args))))
203 if ((mp->mnt_flag & MNT_RDONLY) == 0)
207 * If updating, check whether changing from read-only to
208 * read/write; if there is no device name, that's all we do.
210 if (mp->mnt_flag & MNT_UPDATE) {
211 imp = VFSTOISOFS(mp);
213 return (vfs_export(mp, &imp->im_export, &args.export));
216 * Not an update, or updating the name: look up the name
217 * and verify that it refers to a sensible block device.
220 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW);
222 error = nlookup(&nd);
224 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
229 if (!vn_isdisk(devvp, &error)) {
235 * Verify that user has necessary permissions on the device,
236 * or has superuser abilities
239 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
240 error = VOP_EACCESS(devvp, accessmode, cred);
242 error = priv_check_cred(cred, PRIV_ROOT, 0);
249 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
250 error = iso_mountfs(devvp, mp, &args);
252 if (devvp != imp->im_devvp)
253 error = EINVAL; /* needs translation */
261 imp = VFSTOISOFS(mp);
262 copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
264 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
265 cd9660_statfs(mp, &mp->mnt_stat, cred);
270 * Common code for mount and mountroot
273 iso_mountfs(struct vnode *devvp, struct mount *mp, struct iso_args *argp)
275 struct iso_mnt *isomp = NULL;
276 struct buf *bp = NULL;
277 struct buf *pribp = NULL, *supbp = NULL;
285 struct iso_volume_descriptor *vdp = 0;
286 struct iso_primary_descriptor *pri = NULL;
287 struct iso_sierra_primary_descriptor *pri_sierra = NULL;
288 struct iso_supplementary_descriptor *sup = NULL;
289 struct iso_directory_record *rootp;
290 int logical_block_size;
291 char cs_local[ICONV_CSNMAXLEN];
292 char cs_disk[ICONV_CSNMAXLEN];
294 if (!(mp->mnt_flag & MNT_RDONLY))
298 * Disallow multiple mounts of the same device.
299 * Disallow mounting of a device that is currently in use
300 * Flush out any old buffers remaining from a previous use.
302 if ((error = vfs_mountedon(devvp)))
304 if (vcount(devvp) > 0)
306 if ((error = vinvalbuf(devvp, V_SAVE, 0, 0)))
309 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
310 error = VOP_OPEN(devvp, FREAD, FSCRED, NULL);
315 if (dev->si_iosize_max != 0)
316 mp->mnt_iosize_max = dev->si_iosize_max;
317 if (mp->mnt_iosize_max > MAXPHYS)
318 mp->mnt_iosize_max = MAXPHYS;
322 /* This is the "logical sector size". The standard says this
323 * should be 2048 or the physical sector size on the device,
324 * whichever is greater. For now, we'll just use a constant.
326 iso_bsize = ISO_DEFAULT_BLOCK_SIZE;
329 for (iso_blknum = 16 + argp->ssector;
330 iso_blknum < 100 + argp->ssector;
332 if ((error = bread(devvp, (off_t)iso_blknum * iso_bsize,
333 iso_bsize, &bp)) != 0)
336 vdp = (struct iso_volume_descriptor *)bp->b_data;
337 if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) {
338 if (bcmp (vdp->id_sierra, ISO_SIERRA_ID,
339 sizeof vdp->id) != 0) {
345 switch (isonum_711 (high_sierra? vdp->type_sierra: vdp->type)){
350 pri = (struct iso_primary_descriptor *)vdp;
352 (struct iso_sierra_primary_descriptor *)vdp;
356 case ISO_VD_SUPPLEMENTARY:
360 sup = (struct iso_supplementary_descriptor *)vdp;
362 if (!(argp->flags & ISOFSMNT_NOJOLIET)) {
363 if (bcmp(sup->escape, "%/@", 3) == 0)
365 if (bcmp(sup->escape, "%/C", 3) == 0)
367 if (bcmp(sup->escape, "%/E", 3) == 0)
370 if ((isonum_711 (sup->flags) & 1) &&
371 (argp->flags & ISOFSMNT_BROKENJOLIET) == 0)
400 isonum_723 (high_sierra?
401 pri_sierra->logical_block_size:
402 pri->logical_block_size);
404 if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE
405 || (logical_block_size & (logical_block_size - 1)) != 0) {
410 rootp = (struct iso_directory_record *)
412 pri_sierra->root_directory_record:
413 pri->root_directory_record);
415 isomp = kmalloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO);
416 isomp->logical_block_size = logical_block_size;
417 isomp->volume_space_size =
418 isonum_733 (high_sierra?
419 pri_sierra->volume_space_size:
420 pri->volume_space_size);
421 isomp->joliet_level = 0;
423 * Since an ISO9660 multi-session CD can also access previous
424 * sessions, we have to include them into the space consider-
425 * ations. This doesn't yield a very accurate number since
426 * parts of the old sessions might be inaccessible now, but we
427 * can't do much better. This is also important for the NFS
428 * filehandle validation.
430 isomp->volume_space_size += argp->ssector;
431 bcopy (rootp, isomp->root, sizeof isomp->root);
432 isomp->root_extent = isonum_733 (rootp->extent);
433 isomp->root_size = isonum_733 (rootp->size);
435 isomp->im_bmask = logical_block_size - 1;
436 isomp->im_bshift = ffs(logical_block_size) - 1;
438 pribp->b_flags |= B_AGE;
442 mp->mnt_data = (qaddr_t)isomp;
443 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
444 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
445 mp->mnt_maxsymlinklen = 0;
446 mp->mnt_flag |= MNT_LOCAL;
447 isomp->im_mountp = mp;
449 isomp->im_devvp = devvp;
451 dev->si_mountpoint = mp;
453 /* Check the Rock Ridge Extention support */
454 if (!(argp->flags & ISOFSMNT_NORRIP)) {
455 if ((error = bread(isomp->im_devvp,
456 lblktooff(isomp, isomp->root_extent + isonum_711(rootp->ext_attr_length)),
457 isomp->logical_block_size, &bp)) != 0)
460 rootp = (struct iso_directory_record *)bp->b_data;
462 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) {
463 argp->flags |= ISOFSMNT_NORRIP;
465 argp->flags &= ~ISOFSMNT_GENS;
469 * The contents are valid,
470 * but they will get reread as part of another vnode, so...
472 bp->b_flags |= B_AGE;
476 isomp->im_flags = argp->flags & (ISOFSMNT_NORRIP | ISOFSMNT_GENS |
477 ISOFSMNT_EXTATT | ISOFSMNT_NOJOLIET |
479 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) {
480 bcopy(argp->cs_local, cs_local, sizeof(cs_local));
481 bcopy(argp->cs_disk, cs_disk, sizeof(cs_disk));
482 cd9660_iconv->open(cs_local, cs_disk, &isomp->im_d2l);
483 cd9660_iconv->open(cs_disk, cs_local, &isomp->im_l2d);
485 isomp->im_d2l = NULL;
486 isomp->im_l2d = NULL;
490 /* this effectively ignores all the mount flags */
491 log(LOG_INFO, "cd9660: High Sierra Format\n");
492 isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA;
494 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) {
496 isomp->iso_ftype = ISO_FTYPE_DEFAULT;
498 case ISOFSMNT_GENS|ISOFSMNT_NORRIP:
499 isomp->iso_ftype = ISO_FTYPE_9660;
502 log(LOG_INFO, "cd9660: RockRidge Extension\n");
503 isomp->iso_ftype = ISO_FTYPE_RRIP;
508 /* Decide whether to use the Joliet descriptor */
510 if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) {
511 log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n", joliet_level);
512 rootp = (struct iso_directory_record *)
513 sup->root_directory_record;
514 bcopy (rootp, isomp->root, sizeof isomp->root);
515 isomp->root_extent = isonum_733 (rootp->extent);
516 isomp->root_size = isonum_733 (rootp->size);
517 isomp->joliet_level = joliet_level;
518 supbp->b_flags |= B_AGE;
526 vfs_add_vnodeops(mp, &cd9660_vnode_vops, &mp->mnt_vn_norm_ops);
527 vfs_add_vnodeops(mp, &cd9660_spec_vops, &mp->mnt_vn_spec_ops);
528 vfs_add_vnodeops(mp, &cd9660_fifo_vops, &mp->mnt_vn_fifo_ops);
532 dev->si_mountpoint = NULL;
540 VOP_CLOSE(devvp, FREAD);
542 kfree((caddr_t)isomp, M_ISOFSMNT);
543 mp->mnt_data = (qaddr_t)0;
549 * unmount system call
552 cd9660_unmount(struct mount *mp, int mntflags)
554 struct iso_mnt *isomp;
555 int error, flags = 0;
557 if (mntflags & MNT_FORCE)
564 if ((error = vflush(mp, 0, flags)))
567 isomp = VFSTOISOFS(mp);
569 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) {
571 cd9660_iconv->close(isomp->im_d2l);
573 cd9660_iconv->close(isomp->im_l2d);
576 isomp->im_devvp->v_rdev->si_mountpoint = NULL;
577 error = VOP_CLOSE(isomp->im_devvp, FREAD);
578 vrele(isomp->im_devvp);
579 kfree((caddr_t)isomp, M_ISOFSMNT);
580 mp->mnt_data = (qaddr_t)0;
581 mp->mnt_flag &= ~MNT_LOCAL;
586 * Return root of a filesystem
589 cd9660_root(struct mount *mp, struct vnode **vpp)
591 struct iso_mnt *imp = VFSTOISOFS(mp);
592 struct iso_directory_record *dp =
593 (struct iso_directory_record *)imp->root;
594 ino_t ino = isodirino(dp, imp);
597 * With RRIP we must use the `.' entry of the root directory.
598 * Simply tell vget, that it's a relocated directory.
600 return (cd9660_vget_internal(mp, ino, vpp,
601 imp->iso_ftype == ISO_FTYPE_RRIP, dp));
605 * Get file system statistics.
608 cd9660_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
610 struct iso_mnt *isomp;
612 isomp = VFSTOISOFS(mp);
614 sbp->f_bsize = isomp->logical_block_size;
615 sbp->f_iosize = sbp->f_bsize; /* XXX */
616 sbp->f_blocks = isomp->volume_space_size;
617 sbp->f_bfree = 0; /* total free blocks */
618 sbp->f_bavail = 0; /* blocks free for non superuser */
619 sbp->f_files = 0; /* total files */
620 sbp->f_ffree = 0; /* free file nodes */
621 if (sbp != &mp->mnt_stat) {
622 sbp->f_type = mp->mnt_vfc->vfc_typenum;
623 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
629 * File handle to vnode
631 * Have to be really careful about stale file handles:
632 * - check that the inode number is in range
633 * - call iget() to get the locked inode
634 * - check for an unallocated inode (i_mode == 0)
635 * - check that the generation number matches
647 cd9660_fhtovp(struct mount *mp, struct vnode *rootvp,
648 struct fid *fhp, struct vnode **vpp)
650 struct ifid *ifhp = (struct ifid *)fhp;
656 kprintf("fhtovp: ino %d, start %ld\n",
657 ifhp->ifid_ino, ifhp->ifid_start);
660 if ((error = VFS_VGET(mp, NULL, ifhp->ifid_ino, &nvp)) != 0) {
665 if (ip->inode.iso_mode == 0) {
675 cd9660_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp,
676 struct ucred **credanonp)
681 imp = VFSTOISOFS(mp);
684 * Get the export permission structure for this <mp, client> tuple.
686 np = vfs_export_lookup(mp, &imp->im_export, nam);
690 *exflagsp = np->netc_exflags;
691 *credanonp = &np->netc_anon;
696 cd9660_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp)
701 * It would be nice if we didn't always set the `relocated' flag
702 * and force the extra read, but I don't want to think about fixing
705 return (cd9660_vget_internal(mp, ino, vpp,
707 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP,
715 cd9660_vget_internal(struct mount *mp, ino_t ino, struct vnode **vpp,
716 int relocated, struct iso_directory_record *isodir)
725 imp = VFSTOISOFS(mp);
728 if ((*vpp = cd9660_ihashget(dev, ino)) != NULLVP)
731 /* Allocate a new vnode/iso_node. */
732 error = getnewvnode(VT_ISOFS, mp, &vp, 0, 0);
737 MALLOC(ip, struct iso_node *, sizeof(struct iso_node), M_ISOFSNODE,
744 * Insert it into the inode hash table and check for a collision.
745 * If a collision occurs, throw away the vnode and try again.
747 if (cd9660_ihashins(ip) != 0) {
748 kprintf("debug: cd9660 ihashins collision, retrying\n");
750 kfree(ip, M_ISOFSNODE);
755 if (isodir == NULL) {
758 lbn = lblkno(imp, ino);
759 if (lbn >= imp->volume_space_size) {
761 kprintf("fhtovp: lbn exceed volume space %d\n", lbn);
765 off = blkoff(imp, ino);
766 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) {
768 kprintf("fhtovp: crosses block boundary %d\n",
769 off + ISO_DIRECTORY_RECORD_SIZE);
773 error = bread(imp->im_devvp,
775 imp->logical_block_size, &bp);
779 kprintf("fhtovp: bread error %d\n",error);
782 isodir = (struct iso_directory_record *)(bp->b_data + off);
784 if (off + isonum_711(isodir->length) >
785 imp->logical_block_size) {
789 kprintf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n",
790 off +isonum_711(isodir->length), off,
791 isonum_711(isodir->length));
796 if (isonum_733(isodir->extent) +
797 isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) {
800 kprintf("fhtovp: file start miss %d vs %d\n",
801 isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length),
810 ip->i_devvp = imp->im_devvp;
815 * On relocated directories we must
816 * read the `.' entry out of a dir.
818 ip->iso_start = ino >> imp->im_bshift;
821 if ((error = cd9660_devblkatoff(vp, (off_t)0, NULL, &bp)) != 0) {
825 isodir = (struct iso_directory_record *)bp->b_data;
828 ip->iso_extent = isonum_733(isodir->extent);
829 ip->i_size = isonum_733(isodir->size);
830 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent;
833 * Setup time stamp, attribute
836 switch (imp->iso_ftype) {
837 default: /* ISO_FTYPE_9660 */
841 if ((imp->im_flags & ISOFSMNT_EXTATT)
842 && (off = isonum_711(isodir->ext_attr_length)))
843 cd9660_devblkatoff(vp, (off_t)-(off << imp->im_bshift), NULL,
847 cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660);
848 cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660);
854 cd9660_rrip_analyze(isodir, ip, imp);
862 * Initialize the associated vnode
864 vp->v_type = IFTOVT(ip->inode.iso_mode);
866 switch (vp->v_type) {
868 vp->v_ops = &mp->mnt_vn_fifo_ops;
872 vp->v_ops = &mp->mnt_vn_spec_ops;
873 addaliasu(vp, umajor(ip->inode.iso_rdev),
874 uminor(ip->inode.iso_rdev));
878 vinitvmio(vp, ip->i_size, PAGE_SIZE, -1);
884 if (ip->iso_extent == imp->root_extent)
885 vsetflags(vp, VROOT);
888 * Return the locked and refd vp
895 * Vnode pointer to File handle
899 cd9660_vptofh(struct vnode *vp, struct fid *fhp)
901 struct iso_node *ip = VTOI(vp);
904 ifhp = (struct ifid *)fhp;
905 ifhp->ifid_len = sizeof(struct ifid);
907 ifhp->ifid_ino = ip->i_number;
908 ifhp->ifid_start = ip->iso_start;
911 kprintf("vptofh: ino %d, start %ld\n",
912 ifhp->ifid_ino,ifhp->ifid_start);