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
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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
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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
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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>
59 #include <vm/vm_zone.h>
63 #include "cd9660_node.h"
64 #include "cd9660_mount.h"
66 extern struct vop_ops cd9660_vnode_vops;
67 extern struct vop_ops cd9660_spec_vops;
68 extern struct vop_ops cd9660_fifo_vops;
70 MALLOC_DEFINE(M_ISOFSMNT, "ISOFS mount", "ISOFS mount structure");
71 MALLOC_DEFINE(M_ISOFSNODE, "ISOFS node", "ISOFS vnode private part");
73 static int cd9660_mount (struct mount *, char *, caddr_t, struct ucred *);
74 static int cd9660_unmount (struct mount *, int);
75 static int cd9660_root (struct mount *, struct vnode **);
76 static int cd9660_statfs (struct mount *, struct statfs *, struct ucred *);
77 static int cd9660_vget (struct mount *, ino_t, struct vnode **);
78 static int cd9660_fhtovp (struct mount *, struct vnode *rootvp,
79 struct fid *, struct vnode **);
80 static int cd9660_checkexp (struct mount *, struct sockaddr *,
81 int *, struct ucred **);
82 static int cd9660_vptofh (struct vnode *, struct fid *);
84 static struct vfsops cd9660_vfsops = {
85 .vfs_mount = cd9660_mount,
86 .vfs_unmount = cd9660_unmount,
87 .vfs_root = cd9660_root,
88 .vfs_statfs = cd9660_statfs,
89 .vfs_sync = vfs_stdsync,
90 .vfs_vget = cd9660_vget,
91 .vfs_fhtovp = cd9660_fhtovp,
92 .vfs_checkexp = cd9660_checkexp,
93 .vfs_vptofh = cd9660_vptofh,
94 .vfs_init = cd9660_init,
95 .vfs_uninit = cd9660_uninit,
97 VFS_SET(cd9660_vfsops, cd9660, VFCF_READONLY);
98 MODULE_VERSION(cd9660, 1);
102 * Called by vfs_mountroot when iso is going to be mounted as root.
105 static int iso_get_ssector (cdev_t dev);
106 static int iso_mountfs (struct vnode *devvp, struct mount *mp,
107 struct iso_args *argp);
110 * Try to find the start of the last data track on this CD-ROM. This
111 * is used to mount the last session of a multi-session CD. Bail out
112 * and return 0 if we fail, this is always a safe bet.
115 iso_get_ssector(cdev_t dev)
117 struct ioc_toc_header h;
118 struct ioc_read_toc_single_entry t;
121 if (dev_dioctl(dev, CDIOREADTOCHEADER, (caddr_t)&h, FREAD, proc0.p_ucred) != 0)
124 for (i = h.ending_track; i >= 0; i--) {
125 t.address_format = CD_LBA_FORMAT;
127 if (dev_dioctl(dev, CDIOREADTOCENTRY, (caddr_t)&t, FREAD, proc0.p_ucred) != 0) {
130 if ((t.entry.control & 4) != 0)
131 /* found a data track */
138 return ntohl(t.entry.addr.lba);
142 iso_mountroot(struct mount *mp)
144 struct iso_args args;
145 struct vnode *rootvp;
148 if ((error = bdevvp(rootdev, &rootvp))) {
149 kprintf("iso_mountroot: can't find rootvp\n");
152 args.flags = ISOFSMNT_ROOT;
154 vn_lock(rootvp, LK_EXCLUSIVE | LK_RETRY);
155 error = VOP_OPEN(rootvp, FREAD, FSCRED, NULL);
160 args.ssector = iso_get_ssector(rootdev);
162 VOP_CLOSE(rootvp, FREAD);
165 kprintf("iso_mountroot(): using session at block %d\n",
167 if ((error = iso_mountfs(rootvp, mp, &args)) != 0)
170 cd9660_statfs(mp, &mp->mnt_stat, proc0.p_ucred);
180 cd9660_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
183 struct iso_args args;
187 struct iso_mnt *imp = 0;
188 struct nlookupdata nd;
190 if ((mp->mnt_flag & (MNT_ROOTFS|MNT_UPDATE)) == MNT_ROOTFS) {
191 return (iso_mountroot(mp));
193 if ((error = copyin(data, (caddr_t)&args, sizeof (struct iso_args))))
196 if ((mp->mnt_flag & MNT_RDONLY) == 0)
200 * If updating, check whether changing from read-only to
201 * read/write; if there is no device name, that's all we do.
203 if (mp->mnt_flag & MNT_UPDATE) {
204 imp = VFSTOISOFS(mp);
206 return (vfs_export(mp, &imp->im_export, &args.export));
209 * Not an update, or updating the name: look up the name
210 * and verify that it refers to a sensible block device.
213 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW);
215 error = nlookup(&nd);
217 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
222 if (!vn_isdisk(devvp, &error)) {
228 * Verify that user has necessary permissions on the device,
229 * or has superuser abilities
232 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
233 error = VOP_ACCESS(devvp, accessmode, cred);
235 error = priv_check_cred(cred, PRIV_ROOT, 0);
242 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
243 error = iso_mountfs(devvp, mp, &args);
245 if (devvp != imp->im_devvp)
246 error = EINVAL; /* needs translation */
254 imp = VFSTOISOFS(mp);
255 copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
257 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
258 cd9660_statfs(mp, &mp->mnt_stat, cred);
263 * Common code for mount and mountroot
266 iso_mountfs(struct vnode *devvp, struct mount *mp, struct iso_args *argp)
268 struct iso_mnt *isomp = NULL;
269 struct buf *bp = NULL;
270 struct buf *pribp = NULL, *supbp = NULL;
278 struct iso_volume_descriptor *vdp = 0;
279 struct iso_primary_descriptor *pri = NULL;
280 struct iso_sierra_primary_descriptor *pri_sierra = NULL;
281 struct iso_supplementary_descriptor *sup = NULL;
282 struct iso_directory_record *rootp;
283 int logical_block_size;
285 if (!(mp->mnt_flag & MNT_RDONLY))
289 * Disallow multiple mounts of the same device.
290 * Disallow mounting of a device that is currently in use
291 * Flush out any old buffers remaining from a previous use.
293 if ((error = vfs_mountedon(devvp)))
295 if (count_udev(devvp->v_umajor, devvp->v_uminor) > 0)
297 if ((error = vinvalbuf(devvp, V_SAVE, 0, 0)))
300 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
301 error = VOP_OPEN(devvp, FREAD, FSCRED, NULL);
306 if (dev->si_iosize_max != 0)
307 mp->mnt_iosize_max = dev->si_iosize_max;
308 if (mp->mnt_iosize_max > MAXPHYS)
309 mp->mnt_iosize_max = MAXPHYS;
313 /* This is the "logical sector size". The standard says this
314 * should be 2048 or the physical sector size on the device,
315 * whichever is greater. For now, we'll just use a constant.
317 iso_bsize = ISO_DEFAULT_BLOCK_SIZE;
320 for (iso_blknum = 16 + argp->ssector;
321 iso_blknum < 100 + argp->ssector;
323 if ((error = bread(devvp, (off_t)iso_blknum * iso_bsize,
324 iso_bsize, &bp)) != 0)
327 vdp = (struct iso_volume_descriptor *)bp->b_data;
328 if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) {
329 if (bcmp (vdp->id_sierra, ISO_SIERRA_ID,
330 sizeof vdp->id) != 0) {
336 switch (isonum_711 (high_sierra? vdp->type_sierra: vdp->type)){
341 pri = (struct iso_primary_descriptor *)vdp;
343 (struct iso_sierra_primary_descriptor *)vdp;
347 case ISO_VD_SUPPLEMENTARY:
351 sup = (struct iso_supplementary_descriptor *)vdp;
353 if (!(argp->flags & ISOFSMNT_NOJOLIET)) {
354 if (bcmp(sup->escape, "%/@", 3) == 0)
356 if (bcmp(sup->escape, "%/C", 3) == 0)
358 if (bcmp(sup->escape, "%/E", 3) == 0)
361 if ((isonum_711 (sup->flags) & 1) &&
362 (argp->flags & ISOFSMNT_BROKENJOLIET) == 0)
391 isonum_723 (high_sierra?
392 pri_sierra->logical_block_size:
393 pri->logical_block_size);
395 if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE
396 || (logical_block_size & (logical_block_size - 1)) != 0) {
401 rootp = (struct iso_directory_record *)
403 pri_sierra->root_directory_record:
404 pri->root_directory_record);
406 isomp = kmalloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO);
407 isomp->logical_block_size = logical_block_size;
408 isomp->volume_space_size =
409 isonum_733 (high_sierra?
410 pri_sierra->volume_space_size:
411 pri->volume_space_size);
412 isomp->joliet_level = 0;
414 * Since an ISO9660 multi-session CD can also access previous
415 * sessions, we have to include them into the space consider-
416 * ations. This doesn't yield a very accurate number since
417 * parts of the old sessions might be inaccessible now, but we
418 * can't do much better. This is also important for the NFS
419 * filehandle validation.
421 isomp->volume_space_size += argp->ssector;
422 bcopy (rootp, isomp->root, sizeof isomp->root);
423 isomp->root_extent = isonum_733 (rootp->extent);
424 isomp->root_size = isonum_733 (rootp->size);
426 isomp->im_bmask = logical_block_size - 1;
427 isomp->im_bshift = ffs(logical_block_size) - 1;
429 pribp->b_flags |= B_AGE;
433 mp->mnt_data = (qaddr_t)isomp;
434 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
435 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
436 mp->mnt_maxsymlinklen = 0;
437 mp->mnt_flag |= MNT_LOCAL;
438 isomp->im_mountp = mp;
440 isomp->im_devvp = devvp;
442 dev->si_mountpoint = mp;
444 /* Check the Rock Ridge Extention support */
445 if (!(argp->flags & ISOFSMNT_NORRIP)) {
446 if ((error = bread(isomp->im_devvp,
447 lblktooff(isomp, isomp->root_extent + isonum_711(rootp->ext_attr_length)),
448 isomp->logical_block_size, &bp)) != 0)
451 rootp = (struct iso_directory_record *)bp->b_data;
453 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) {
454 argp->flags |= ISOFSMNT_NORRIP;
456 argp->flags &= ~ISOFSMNT_GENS;
460 * The contents are valid,
461 * but they will get reread as part of another vnode, so...
463 bp->b_flags |= B_AGE;
467 isomp->im_flags = argp->flags & (ISOFSMNT_NORRIP | ISOFSMNT_GENS |
468 ISOFSMNT_EXTATT | ISOFSMNT_NOJOLIET);
471 /* this effectively ignores all the mount flags */
472 log(LOG_INFO, "cd9660: High Sierra Format\n");
473 isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA;
475 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) {
477 isomp->iso_ftype = ISO_FTYPE_DEFAULT;
479 case ISOFSMNT_GENS|ISOFSMNT_NORRIP:
480 isomp->iso_ftype = ISO_FTYPE_9660;
483 log(LOG_INFO, "cd9660: RockRidge Extension\n");
484 isomp->iso_ftype = ISO_FTYPE_RRIP;
489 /* Decide whether to use the Joliet descriptor */
491 if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) {
492 log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n", joliet_level);
493 rootp = (struct iso_directory_record *)
494 sup->root_directory_record;
495 bcopy (rootp, isomp->root, sizeof isomp->root);
496 isomp->root_extent = isonum_733 (rootp->extent);
497 isomp->root_size = isonum_733 (rootp->size);
498 isomp->joliet_level = joliet_level;
499 supbp->b_flags |= B_AGE;
507 vfs_add_vnodeops(mp, &cd9660_vnode_vops, &mp->mnt_vn_norm_ops);
508 vfs_add_vnodeops(mp, &cd9660_spec_vops, &mp->mnt_vn_spec_ops);
509 vfs_add_vnodeops(mp, &cd9660_fifo_vops, &mp->mnt_vn_fifo_ops);
513 dev->si_mountpoint = NULL;
521 VOP_CLOSE(devvp, FREAD);
523 kfree((caddr_t)isomp, M_ISOFSMNT);
524 mp->mnt_data = (qaddr_t)0;
530 * unmount system call
533 cd9660_unmount(struct mount *mp, int mntflags)
535 struct iso_mnt *isomp;
536 int error, flags = 0;
538 if (mntflags & MNT_FORCE)
545 if ((error = vflush(mp, 0, flags)))
548 isomp = VFSTOISOFS(mp);
550 isomp->im_devvp->v_rdev->si_mountpoint = NULL;
551 error = VOP_CLOSE(isomp->im_devvp, FREAD);
552 vrele(isomp->im_devvp);
553 kfree((caddr_t)isomp, M_ISOFSMNT);
554 mp->mnt_data = (qaddr_t)0;
555 mp->mnt_flag &= ~MNT_LOCAL;
560 * Return root of a filesystem
563 cd9660_root(struct mount *mp, struct vnode **vpp)
565 struct iso_mnt *imp = VFSTOISOFS(mp);
566 struct iso_directory_record *dp =
567 (struct iso_directory_record *)imp->root;
568 ino_t ino = isodirino(dp, imp);
571 * With RRIP we must use the `.' entry of the root directory.
572 * Simply tell vget, that it's a relocated directory.
574 return (cd9660_vget_internal(mp, ino, vpp,
575 imp->iso_ftype == ISO_FTYPE_RRIP, dp));
579 * Get file system statistics.
582 cd9660_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
584 struct iso_mnt *isomp;
586 isomp = VFSTOISOFS(mp);
588 sbp->f_bsize = isomp->logical_block_size;
589 sbp->f_iosize = sbp->f_bsize; /* XXX */
590 sbp->f_blocks = isomp->volume_space_size;
591 sbp->f_bfree = 0; /* total free blocks */
592 sbp->f_bavail = 0; /* blocks free for non superuser */
593 sbp->f_files = 0; /* total files */
594 sbp->f_ffree = 0; /* free file nodes */
595 if (sbp != &mp->mnt_stat) {
596 sbp->f_type = mp->mnt_vfc->vfc_typenum;
597 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
603 * File handle to vnode
605 * Have to be really careful about stale file handles:
606 * - check that the inode number is in range
607 * - call iget() to get the locked inode
608 * - check for an unallocated inode (i_mode == 0)
609 * - check that the generation number matches
621 cd9660_fhtovp(struct mount *mp, struct vnode *rootvp,
622 struct fid *fhp, struct vnode **vpp)
624 struct ifid *ifhp = (struct ifid *)fhp;
630 kprintf("fhtovp: ino %d, start %ld\n",
631 ifhp->ifid_ino, ifhp->ifid_start);
634 if ((error = VFS_VGET(mp, ifhp->ifid_ino, &nvp)) != 0) {
639 if (ip->inode.iso_mode == 0) {
649 cd9660_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp,
650 struct ucred **credanonp)
655 imp = VFSTOISOFS(mp);
658 * Get the export permission structure for this <mp, client> tuple.
660 np = vfs_export_lookup(mp, &imp->im_export, nam);
664 *exflagsp = np->netc_exflags;
665 *credanonp = &np->netc_anon;
670 cd9660_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
675 * It would be nice if we didn't always set the `relocated' flag
676 * and force the extra read, but I don't want to think about fixing
679 return (cd9660_vget_internal(mp, ino, vpp,
681 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP,
685 (struct iso_directory_record *)0));
689 cd9660_vget_internal(struct mount *mp, ino_t ino, struct vnode **vpp,
690 int relocated, struct iso_directory_record *isodir)
699 imp = VFSTOISOFS(mp);
702 if ((*vpp = cd9660_ihashget(dev, ino)) != NULLVP)
705 /* Allocate a new vnode/iso_node. */
706 error = getnewvnode(VT_ISOFS, mp, &vp, 0, 0);
711 MALLOC(ip, struct iso_node *, sizeof(struct iso_node), M_ISOFSNODE,
718 * Insert it into the inode hash table and check for a collision.
719 * If a collision occurs, throw away the vnode and try again.
721 if (cd9660_ihashins(ip) != 0) {
722 kprintf("debug: cd9660 ihashins collision, retrying\n");
724 kfree(ip, M_ISOFSNODE);
729 if (isodir == NULL) {
732 lbn = lblkno(imp, ino);
733 if (lbn >= imp->volume_space_size) {
735 kprintf("fhtovp: lbn exceed volume space %d\n", lbn);
739 off = blkoff(imp, ino);
740 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) {
742 kprintf("fhtovp: crosses block boundary %d\n",
743 off + ISO_DIRECTORY_RECORD_SIZE);
747 error = bread(imp->im_devvp,
749 imp->logical_block_size, &bp);
753 kprintf("fhtovp: bread error %d\n",error);
756 isodir = (struct iso_directory_record *)(bp->b_data + off);
758 if (off + isonum_711(isodir->length) >
759 imp->logical_block_size) {
763 kprintf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n",
764 off +isonum_711(isodir->length), off,
765 isonum_711(isodir->length));
770 if (isonum_733(isodir->extent) +
771 isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) {
774 kprintf("fhtovp: file start miss %d vs %d\n",
775 isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length),
784 ip->i_devvp = imp->im_devvp;
789 * On relocated directories we must
790 * read the `.' entry out of a dir.
792 ip->iso_start = ino >> imp->im_bshift;
795 if ((error = cd9660_devblkatoff(vp, (off_t)0, NULL, &bp)) != 0) {
799 isodir = (struct iso_directory_record *)bp->b_data;
802 ip->iso_extent = isonum_733(isodir->extent);
803 ip->i_size = isonum_733(isodir->size);
804 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent;
807 * Setup time stamp, attribute
810 switch (imp->iso_ftype) {
811 default: /* ISO_FTYPE_9660 */
815 if ((imp->im_flags & ISOFSMNT_EXTATT)
816 && (off = isonum_711(isodir->ext_attr_length)))
817 cd9660_devblkatoff(vp, (off_t)-(off << imp->im_bshift), NULL,
821 cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660);
822 cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660);
828 cd9660_rrip_analyze(isodir, ip, imp);
836 * Initialize the associated vnode
838 vp->v_type = IFTOVT(ip->inode.iso_mode);
840 switch (vp->v_type) {
842 vp->v_ops = &mp->mnt_vn_fifo_ops;
846 vp->v_ops = &mp->mnt_vn_spec_ops;
847 addaliasu(vp, umajor(ip->inode.iso_rdev),
848 uminor(ip->inode.iso_rdev));
852 vinitvmio(vp, ip->i_size);
858 if (ip->iso_extent == imp->root_extent)
862 * Return the locked and refd vp
869 * Vnode pointer to File handle
873 cd9660_vptofh(struct vnode *vp, struct fid *fhp)
875 struct iso_node *ip = VTOI(vp);
878 ifhp = (struct ifid *)fhp;
879 ifhp->ifid_len = sizeof(struct ifid);
881 ifhp->ifid_ino = ip->i_number;
882 ifhp->ifid_start = ip->iso_start;
885 kprintf("vptofh: ino %d, start %ld\n",
886 ifhp->ifid_ino,ifhp->ifid_start);