1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley
8 * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension
9 * Support code is derived from software contributed to Berkeley
10 * by Atsushi Murai (amurai@spec.co.jp).
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)cd9660_vfsops.c 8.18 (Berkeley) 5/22/95
37 */
38
39 #include <sys/cdefs.h>
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/namei.h>
43 #include <sys/priv.h>
44 #include <sys/proc.h>
45 #include <sys/kernel.h>
46 #include <sys/vnode.h>
47 #include <sys/mount.h>
48 #include <sys/bio.h>
49 #include <sys/buf.h>
50 #include <sys/cdio.h>
51 #include <sys/conf.h>
52 #include <sys/fcntl.h>
53 #include <sys/malloc.h>
54 #include <sys/stat.h>
55 #include <sys/syslog.h>
56 #include <sys/iconv.h>
57
58 #include <fs/cd9660/iso.h>
59 #include <fs/cd9660/iso_rrip.h>
60 #include <fs/cd9660/cd9660_node.h>
61 #include <fs/cd9660/cd9660_mount.h>
62
63 #include <geom/geom.h>
64 #include <geom/geom_vfs.h>
65
66 MALLOC_DEFINE(M_ISOFSMNT, "isofs_mount", "ISOFS mount structure");
67 MALLOC_DEFINE(M_ISOFSNODE, "isofs_node", "ISOFS vnode private part");
68
69 struct iconv_functions *cd9660_iconv = NULL;
70
71 static vfs_mount_t cd9660_mount;
72 static vfs_cmount_t cd9660_cmount;
73 static vfs_unmount_t cd9660_unmount;
74 static vfs_root_t cd9660_root;
75 static vfs_statfs_t cd9660_statfs;
76 static vfs_vget_t cd9660_vget;
77 static vfs_fhtovp_t cd9660_fhtovp;
78
79 static struct vfsops cd9660_vfsops = {
80 .vfs_fhtovp = cd9660_fhtovp,
81 .vfs_mount = cd9660_mount,
82 .vfs_cmount = cd9660_cmount,
83 .vfs_root = cd9660_root,
84 .vfs_statfs = cd9660_statfs,
85 .vfs_unmount = cd9660_unmount,
86 .vfs_vget = cd9660_vget,
87 };
88 VFS_SET(cd9660_vfsops, cd9660, VFCF_READONLY);
89 MODULE_VERSION(cd9660, 1);
90
91 static int cd9660_vfs_hash_cmp(struct vnode *vp, void *pino);
92 static int iso_mountfs(struct vnode *devvp, struct mount *mp);
93
94 /*
95 * VFS Operations.
96 */
97
98 static int
cd9660_cmount(struct mntarg * ma,void * data,uint64_t flags)99 cd9660_cmount(struct mntarg *ma, void *data, uint64_t flags)
100 {
101 struct iso_args args;
102 int error;
103
104 error = copyin(data, &args, sizeof args);
105 if (error)
106 return (error);
107
108 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN);
109 ma = mount_arg(ma, "export", &args.export, sizeof(args.export));
110 if (args.flags & ISOFSMNT_UID)
111 ma = mount_argf(ma, "uid", "%d", args.uid);
112 if (args.flags & ISOFSMNT_GID)
113 ma = mount_argf(ma, "gid", "%d", args.gid);
114 ma = mount_argf(ma, "mask", "%d", args.fmask);
115 ma = mount_argf(ma, "dirmask", "%d", args.dmask);
116 ma = mount_argsu(ma, "cs_disk", args.cs_disk, 64);
117 ma = mount_argsu(ma, "cs_local", args.cs_local, 64);
118 ma = mount_argf(ma, "ssector", "%u", args.ssector);
119 ma = mount_argb(ma, !(args.flags & ISOFSMNT_NORRIP), "norrip");
120 ma = mount_argb(ma, args.flags & ISOFSMNT_GENS, "nogens");
121 ma = mount_argb(ma, args.flags & ISOFSMNT_EXTATT, "noextatt");
122 ma = mount_argb(ma, !(args.flags & ISOFSMNT_NOJOLIET), "nojoliet");
123 ma = mount_argb(ma,
124 args.flags & ISOFSMNT_BROKENJOLIET, "nobrokenjoliet");
125 ma = mount_argb(ma, args.flags & ISOFSMNT_KICONV, "nokiconv");
126
127 error = kernel_mount(ma, flags);
128
129 return (error);
130 }
131
132 static int
cd9660_mount(struct mount * mp)133 cd9660_mount(struct mount *mp)
134 {
135 struct vnode *devvp;
136 struct thread *td;
137 char *fspec;
138 int error;
139 accmode_t accmode;
140 struct nameidata ndp;
141 struct iso_mnt *imp = NULL;
142
143 td = curthread;
144
145 /*
146 * Unconditionally mount as read-only.
147 */
148 MNT_ILOCK(mp);
149 mp->mnt_flag |= MNT_RDONLY;
150 MNT_IUNLOCK(mp);
151
152 fspec = vfs_getopts(mp->mnt_optnew, "from", &error);
153 if (error)
154 return (error);
155
156 imp = VFSTOISOFS(mp);
157
158 if (mp->mnt_flag & MNT_UPDATE) {
159 if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0))
160 return (0);
161 }
162 /*
163 * Not an update, or updating the name: look up the name
164 * and verify that it refers to a sensible block device.
165 */
166 NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec);
167 if ((error = namei(&ndp)))
168 return (error);
169 NDFREE_PNBUF(&ndp);
170 devvp = ndp.ni_vp;
171
172 if (!vn_isdisk_error(devvp, &error)) {
173 vput(devvp);
174 return (error);
175 }
176
177 /*
178 * Verify that user has necessary permissions on the device,
179 * or has superuser abilities
180 */
181 accmode = VREAD;
182 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td);
183 if (error)
184 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
185 if (error) {
186 vput(devvp);
187 return (error);
188 }
189
190 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
191 error = iso_mountfs(devvp, mp);
192 if (error)
193 vrele(devvp);
194 } else {
195 if (devvp != imp->im_devvp)
196 error = EINVAL; /* needs translation */
197 vput(devvp);
198 }
199 if (error)
200 return (error);
201 vfs_mountedfrom(mp, fspec);
202 return (0);
203 }
204
205 /*
206 * Common code for mount and mountroot
207 */
208 static int
iso_mountfs(struct vnode * devvp,struct mount * mp)209 iso_mountfs(struct vnode *devvp, struct mount *mp)
210 {
211 struct iso_mnt *isomp = NULL;
212 struct buf *bp = NULL;
213 struct buf *pribp = NULL, *supbp = NULL;
214 struct cdev *dev;
215 int error = EINVAL;
216 int high_sierra = 0;
217 int iso_bsize;
218 int iso_blknum;
219 int joliet_level;
220 int isverified = 0;
221 struct iso_volume_descriptor *vdp = NULL;
222 struct iso_primary_descriptor *pri = NULL;
223 struct iso_sierra_primary_descriptor *pri_sierra = NULL;
224 struct iso_supplementary_descriptor *sup = NULL;
225 struct iso_directory_record *rootp;
226 int logical_block_size, ssector;
227 struct g_consumer *cp;
228 struct bufobj *bo;
229 char *cs_local, *cs_disk;
230 int v;
231
232 dev = devvp->v_rdev;
233 dev_ref(dev);
234 g_topology_lock();
235 error = g_vfs_open(devvp, &cp, "cd9660", 0);
236 if (error == 0)
237 g_getattr("MNT::verified", cp, &isverified);
238 g_topology_unlock();
239 VOP_UNLOCK(devvp);
240 if (error)
241 goto out;
242 if (devvp->v_rdev->si_iosize_max != 0)
243 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
244 if (mp->mnt_iosize_max > maxphys)
245 mp->mnt_iosize_max = maxphys;
246
247 bo = &devvp->v_bufobj;
248
249 /* This is the "logical sector size". The standard says this
250 * should be 2048 or the physical sector size on the device,
251 * whichever is greater.
252 */
253 if ((ISO_DEFAULT_BLOCK_SIZE % cp->provider->sectorsize) != 0) {
254 error = EINVAL;
255 goto out;
256 }
257
258 iso_bsize = cp->provider->sectorsize;
259
260 joliet_level = 0;
261 if (1 != vfs_scanopt(mp->mnt_optnew, "ssector", "%d", &ssector))
262 ssector = 0;
263 for (iso_blknum = 16 + ssector;
264 iso_blknum < 100 + ssector;
265 iso_blknum++) {
266 if ((error = bread(devvp, iso_blknum * btodb(ISO_DEFAULT_BLOCK_SIZE),
267 iso_bsize, NOCRED, &bp)) != 0)
268 goto out;
269
270 vdp = (struct iso_volume_descriptor *)bp->b_data;
271 if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) {
272 if (bcmp (vdp->id_sierra, ISO_SIERRA_ID,
273 sizeof vdp->id_sierra) != 0) {
274 error = EINVAL;
275 goto out;
276 } else
277 high_sierra = 1;
278 }
279 switch (isonum_711 (high_sierra? vdp->type_sierra: vdp->type)){
280 case ISO_VD_PRIMARY:
281 if (pribp == NULL) {
282 pribp = bp;
283 bp = NULL;
284 pri = (struct iso_primary_descriptor *)vdp;
285 pri_sierra =
286 (struct iso_sierra_primary_descriptor *)vdp;
287 }
288 break;
289
290 case ISO_VD_SUPPLEMENTARY:
291 if (supbp == NULL) {
292 supbp = bp;
293 bp = NULL;
294 sup = (struct iso_supplementary_descriptor *)vdp;
295
296 if (!vfs_flagopt(mp->mnt_optnew, "nojoliet", NULL, 0)) {
297 if (bcmp(sup->escape, "%/@", 3) == 0)
298 joliet_level = 1;
299 if (bcmp(sup->escape, "%/C", 3) == 0)
300 joliet_level = 2;
301 if (bcmp(sup->escape, "%/E", 3) == 0)
302 joliet_level = 3;
303
304 if ((isonum_711 (sup->flags) & 1) &&
305 !vfs_flagopt(mp->mnt_optnew, "brokenjoliet", NULL, 0))
306 joliet_level = 0;
307 }
308 }
309 break;
310
311 case ISO_VD_END:
312 goto vd_end;
313
314 default:
315 break;
316 }
317 if (bp != NULL) {
318 brelse(bp);
319 bp = NULL;
320 }
321 }
322 vd_end:
323 if (bp != NULL) {
324 brelse(bp);
325 bp = NULL;
326 }
327
328 if (pri == NULL) {
329 error = EINVAL;
330 goto out;
331 }
332
333 logical_block_size =
334 isonum_723 (high_sierra?
335 pri_sierra->logical_block_size:
336 pri->logical_block_size);
337
338 if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE
339 || (logical_block_size & (logical_block_size - 1)) != 0) {
340 error = EINVAL;
341 goto out;
342 }
343
344 if (logical_block_size < cp->provider->sectorsize) {
345 printf("cd9660: Unsupported logical block size %u\n",
346 logical_block_size);
347 error = EINVAL;
348 goto out;
349 }
350
351 rootp = (struct iso_directory_record *)
352 (high_sierra?
353 pri_sierra->root_directory_record:
354 pri->root_directory_record);
355
356 isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO);
357 isomp->im_cp = cp;
358 isomp->im_bo = bo;
359 isomp->logical_block_size = logical_block_size;
360 isomp->volume_space_size =
361 isonum_733 (high_sierra?
362 pri_sierra->volume_space_size:
363 pri->volume_space_size);
364 isomp->joliet_level = 0;
365 /*
366 * Since an ISO9660 multi-session CD can also access previous
367 * sessions, we have to include them into the space consider-
368 * ations. This doesn't yield a very accurate number since
369 * parts of the old sessions might be inaccessible now, but we
370 * can't do much better. This is also important for the NFS
371 * filehandle validation.
372 */
373 isomp->volume_space_size += ssector;
374 memcpy(isomp->root, rootp, sizeof isomp->root);
375 isomp->root_extent = isonum_733 (rootp->extent);
376 isomp->root_size = isonum_733 (rootp->size);
377
378 isomp->im_bmask = logical_block_size - 1;
379 isomp->im_bshift = ffs(logical_block_size) - 1;
380
381 pribp->b_flags |= B_AGE;
382 brelse(pribp);
383 pribp = NULL;
384 rootp = NULL;
385 pri = NULL;
386 pri_sierra = NULL;
387
388 mp->mnt_data = isomp;
389 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
390 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
391 MNT_ILOCK(mp);
392 if (isverified)
393 mp->mnt_flag |= MNT_VERIFIED;
394 mp->mnt_flag |= MNT_LOCAL;
395 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED;
396 MNT_IUNLOCK(mp);
397 isomp->im_mountp = mp;
398 isomp->im_dev = dev;
399 isomp->im_devvp = devvp;
400 isomp->im_fmask = isomp->im_dmask = ALLPERMS;
401
402 vfs_flagopt(mp->mnt_optnew, "norrip", &isomp->im_flags, ISOFSMNT_NORRIP);
403 vfs_flagopt(mp->mnt_optnew, "gens", &isomp->im_flags, ISOFSMNT_GENS);
404 vfs_flagopt(mp->mnt_optnew, "extatt", &isomp->im_flags, ISOFSMNT_EXTATT);
405 vfs_flagopt(mp->mnt_optnew, "nojoliet", &isomp->im_flags, ISOFSMNT_NOJOLIET);
406 vfs_flagopt(mp->mnt_optnew, "kiconv", &isomp->im_flags, ISOFSMNT_KICONV);
407
408 if (vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v) == 1) {
409 isomp->im_flags |= ISOFSMNT_UID;
410 isomp->im_uid = v;
411 }
412 if (vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v) == 1) {
413 isomp->im_flags |= ISOFSMNT_GID;
414 isomp->im_gid = v;
415 }
416 if (vfs_scanopt(mp->mnt_optnew, "mask", "%d", &v) == 1) {
417 isomp->im_fmask &= v;
418 }
419 if (vfs_scanopt(mp->mnt_optnew, "dirmask", "%d", &v) == 1) {
420 isomp->im_dmask &= v;
421 }
422
423 /* Check the Rock Ridge Extension support */
424 if (!(isomp->im_flags & ISOFSMNT_NORRIP)) {
425 if ((error = bread(isomp->im_devvp, (isomp->root_extent +
426 isonum_711(((struct iso_directory_record *)isomp->root)->
427 ext_attr_length)) << (isomp->im_bshift - DEV_BSHIFT),
428 isomp->logical_block_size, NOCRED, &bp)) != 0)
429 goto out;
430
431 rootp = (struct iso_directory_record *)bp->b_data;
432
433 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) {
434 isomp->im_flags |= ISOFSMNT_NORRIP;
435 } else {
436 isomp->im_flags &= ~ISOFSMNT_GENS;
437 }
438
439 /*
440 * The contents are valid,
441 * but they will get reread as part of another vnode, so...
442 */
443 bp->b_flags |= B_AGE;
444 brelse(bp);
445 bp = NULL;
446 rootp = NULL;
447 }
448
449 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) {
450 cs_local = vfs_getopts(mp->mnt_optnew, "cs_local", &error);
451 if (error)
452 goto out;
453 cs_disk = vfs_getopts(mp->mnt_optnew, "cs_disk", &error);
454 if (error)
455 goto out;
456 cd9660_iconv->open(cs_local, cs_disk, &isomp->im_d2l);
457 cd9660_iconv->open(cs_disk, cs_local, &isomp->im_l2d);
458 } else {
459 isomp->im_d2l = NULL;
460 isomp->im_l2d = NULL;
461 }
462
463 if (high_sierra) {
464 /* this effectively ignores all the mount flags */
465 if (bootverbose)
466 log(LOG_INFO, "cd9660: High Sierra Format\n");
467 isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA;
468 } else
469 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) {
470 default:
471 isomp->iso_ftype = ISO_FTYPE_DEFAULT;
472 break;
473 case ISOFSMNT_GENS|ISOFSMNT_NORRIP:
474 isomp->iso_ftype = ISO_FTYPE_9660;
475 break;
476 case 0:
477 if (bootverbose)
478 log(LOG_INFO, "cd9660: RockRidge Extension\n");
479 isomp->iso_ftype = ISO_FTYPE_RRIP;
480 break;
481 }
482
483 /* Decide whether to use the Joliet descriptor */
484
485 if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) {
486 if (bootverbose)
487 log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n",
488 joliet_level);
489 rootp = (struct iso_directory_record *)
490 sup->root_directory_record;
491 memcpy(isomp->root, rootp, sizeof isomp->root);
492 isomp->root_extent = isonum_733 (rootp->extent);
493 isomp->root_size = isonum_733 (rootp->size);
494 isomp->joliet_level = joliet_level;
495 supbp->b_flags |= B_AGE;
496 }
497
498 if (supbp) {
499 brelse(supbp);
500 supbp = NULL;
501 sup = NULL;
502 }
503
504 return 0;
505 out:
506 if (bp != NULL)
507 brelse(bp);
508 if (pribp != NULL)
509 brelse(pribp);
510 if (supbp != NULL)
511 brelse(supbp);
512 if (cp != NULL) {
513 g_topology_lock();
514 g_vfs_close(cp);
515 g_topology_unlock();
516 }
517 if (isomp) {
518 free(isomp, M_ISOFSMNT);
519 mp->mnt_data = NULL;
520 }
521 dev_rel(dev);
522 return error;
523 }
524
525 /*
526 * unmount system call
527 */
528 static int
cd9660_unmount(struct mount * mp,int mntflags)529 cd9660_unmount(struct mount *mp, int mntflags)
530 {
531 struct iso_mnt *isomp;
532 int error, flags = 0;
533
534 if (mntflags & MNT_FORCE)
535 flags |= FORCECLOSE;
536 if ((error = vflush(mp, 0, flags, curthread)))
537 return (error);
538
539 isomp = VFSTOISOFS(mp);
540
541 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) {
542 if (isomp->im_d2l)
543 cd9660_iconv->close(isomp->im_d2l);
544 if (isomp->im_l2d)
545 cd9660_iconv->close(isomp->im_l2d);
546 }
547 g_topology_lock();
548 g_vfs_close(isomp->im_cp);
549 g_topology_unlock();
550 vrele(isomp->im_devvp);
551 dev_rel(isomp->im_dev);
552 free(isomp, M_ISOFSMNT);
553 mp->mnt_data = NULL;
554 return (error);
555 }
556
557 /*
558 * Return root of a filesystem
559 */
560 static int
cd9660_root(struct mount * mp,int flags,struct vnode ** vpp)561 cd9660_root(struct mount *mp, int flags, struct vnode **vpp)
562 {
563 struct iso_mnt *imp = VFSTOISOFS(mp);
564 struct iso_directory_record *dp =
565 (struct iso_directory_record *)imp->root;
566 ino_t ino = isodirino(dp, imp);
567
568 /*
569 * With RRIP we must use the `.' entry of the root directory.
570 * Simply tell vget, that it's a relocated directory.
571 */
572 return (cd9660_vget_internal(mp, ino, flags, vpp,
573 imp->iso_ftype == ISO_FTYPE_RRIP, dp));
574 }
575
576 /*
577 * Get filesystem statistics.
578 */
579 static int
cd9660_statfs(struct mount * mp,struct statfs * sbp)580 cd9660_statfs(struct mount *mp, struct statfs *sbp)
581 {
582 struct iso_mnt *isomp;
583
584 isomp = VFSTOISOFS(mp);
585
586 sbp->f_bsize = isomp->logical_block_size;
587 sbp->f_iosize = sbp->f_bsize; /* XXX */
588 sbp->f_blocks = isomp->volume_space_size;
589 sbp->f_bfree = 0; /* total free blocks */
590 sbp->f_bavail = 0; /* blocks free for non superuser */
591 sbp->f_files = 0; /* total files */
592 sbp->f_ffree = 0; /* free file nodes */
593 return 0;
594 }
595
596 /*
597 * File handle to vnode
598 *
599 * Have to be really careful about stale file handles:
600 * - check that the inode number is in range
601 * - call iget() to get the locked inode
602 * - check for an unallocated inode (i_mode == 0)
603 * - check that the generation number matches
604 */
605
606 /* ARGSUSED */
607 static int
cd9660_fhtovp(struct mount * mp,struct fid * fhp,int flags,struct vnode ** vpp)608 cd9660_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
609 {
610 struct ifid ifh;
611 struct iso_node *ip;
612 struct vnode *nvp;
613 int error;
614
615 memcpy(&ifh, fhp, sizeof(ifh));
616
617 #ifdef ISOFS_DBG
618 printf("fhtovp: ino %d, start %ld\n",
619 ifh.ifid_ino, ifh.ifid_start);
620 #endif
621
622 if ((error = VFS_VGET(mp, ifh.ifid_ino, LK_EXCLUSIVE, &nvp)) != 0) {
623 *vpp = NULLVP;
624 return (error);
625 }
626 ip = VTOI(nvp);
627 if (ip->inode.iso_mode == 0) {
628 vput(nvp);
629 *vpp = NULLVP;
630 return (ESTALE);
631 }
632 *vpp = nvp;
633 vnode_create_vobject(*vpp, ip->i_size, curthread);
634 return (0);
635 }
636
637 /*
638 * Conform to standard VFS interface; can't vget arbitrary inodes beyond 4GB
639 * into media with current inode scheme and 32-bit ino_t. This shouldn't be
640 * needed for anything other than nfsd, and who exports a mounted DVD over NFS?
641 */
642 static int
cd9660_vget(struct mount * mp,ino_t ino,int flags,struct vnode ** vpp)643 cd9660_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
644 {
645
646 /*
647 * XXXX
648 * It would be nice if we didn't always set the `relocated' flag
649 * and force the extra read, but I don't want to think about fixing
650 * that right now.
651 */
652 return (cd9660_vget_internal(mp, ino, flags, vpp,
653 #if 0
654 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP,
655 #else
656 0,
657 #endif
658 (struct iso_directory_record *)0));
659 }
660
661 /* Use special comparator for full 64-bit ino comparison. */
662 static int
cd9660_vfs_hash_cmp(struct vnode * vp,void * pino)663 cd9660_vfs_hash_cmp(struct vnode *vp, void *pino)
664 {
665 struct iso_node *ip;
666 ino_t ino;
667
668 ip = VTOI(vp);
669 ino = *(ino_t *)pino;
670 return (ip->i_number != ino);
671 }
672
673 int
cd9660_vget_internal(struct mount * mp,ino_t ino,int flags,struct vnode ** vpp,int relocated,struct iso_directory_record * isodir)674 cd9660_vget_internal(struct mount *mp, ino_t ino, int flags,
675 struct vnode **vpp, int relocated, struct iso_directory_record *isodir)
676 {
677 struct iso_mnt *imp;
678 struct iso_node *ip;
679 struct buf *bp;
680 struct vnode *vp;
681 int error;
682 struct thread *td;
683
684 td = curthread;
685 error = vfs_hash_get(mp, ino, flags, td, vpp, cd9660_vfs_hash_cmp,
686 &ino);
687 if (error || *vpp != NULL)
688 return (error);
689
690 /*
691 * We must promote to an exclusive lock for vnode creation. This
692 * can happen if lookup is passed LOCKSHARED.
693 */
694 if ((flags & LK_TYPE_MASK) == LK_SHARED) {
695 flags &= ~LK_TYPE_MASK;
696 flags |= LK_EXCLUSIVE;
697 }
698
699 /*
700 * We do not lock vnode creation as it is believed to be too
701 * expensive for such rare case as simultaneous creation of vnode
702 * for same ino by different processes. We just allow them to race
703 * and check later to decide who wins. Let the race begin!
704 */
705
706 imp = VFSTOISOFS(mp);
707
708 /* Allocate a new vnode/iso_node. */
709 if ((error = getnewvnode("isofs", mp, &cd9660_vnodeops, &vp)) != 0) {
710 *vpp = NULLVP;
711 return (error);
712 }
713 ip = malloc(sizeof(struct iso_node), M_ISOFSNODE,
714 M_WAITOK | M_ZERO);
715 vp->v_data = ip;
716 ip->i_vnode = vp;
717 ip->i_number = ino;
718
719 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
720 error = insmntque(vp, mp);
721 if (error != 0) {
722 free(ip, M_ISOFSNODE);
723 *vpp = NULLVP;
724 return (error);
725 }
726 error = vfs_hash_insert(vp, ino, flags, td, vpp, cd9660_vfs_hash_cmp,
727 &ino);
728 if (error || *vpp != NULL)
729 return (error);
730
731 if (isodir == NULL) {
732 int lbn, off;
733
734 lbn = lblkno(imp, ino);
735 if (lbn >= imp->volume_space_size) {
736 vput(vp);
737 printf("fhtovp: lbn exceed volume space %d\n", lbn);
738 return (ESTALE);
739 }
740
741 off = blkoff(imp, ino);
742 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) {
743 vput(vp);
744 printf("fhtovp: crosses block boundary %d\n",
745 off + ISO_DIRECTORY_RECORD_SIZE);
746 return (ESTALE);
747 }
748
749 error = bread(imp->im_devvp,
750 lbn << (imp->im_bshift - DEV_BSHIFT),
751 imp->logical_block_size, NOCRED, &bp);
752 if (error) {
753 vput(vp);
754 printf("fhtovp: bread error %d\n",error);
755 return (error);
756 }
757 isodir = (struct iso_directory_record *)(bp->b_data + off);
758
759 if (off + isonum_711(isodir->length) >
760 imp->logical_block_size) {
761 vput(vp);
762 brelse(bp);
763 printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n",
764 off +isonum_711(isodir->length), off,
765 isonum_711(isodir->length));
766 return (ESTALE);
767 }
768
769 #if 0
770 if (isonum_733(isodir->extent) +
771 isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) {
772 brelse(bp);
773 printf("fhtovp: file start miss %d vs %d\n",
774 isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length),
775 ifhp->ifid_start);
776 return (ESTALE);
777 }
778 #endif
779 } else
780 bp = NULL;
781
782 ip->i_mnt = imp;
783
784 if (relocated) {
785 /*
786 * On relocated directories we must
787 * read the `.' entry out of a dir.
788 */
789 ip->iso_start = ino >> imp->im_bshift;
790 if (bp != NULL)
791 brelse(bp);
792 if ((error = cd9660_blkatoff(vp, (off_t)0, NULL, &bp)) != 0) {
793 vput(vp);
794 return (error);
795 }
796 isodir = (struct iso_directory_record *)bp->b_data;
797 }
798
799 ip->iso_extent = isonum_733(isodir->extent);
800 ip->i_size = isonum_733(isodir->size);
801 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent;
802
803 /*
804 * Setup time stamp, attribute
805 */
806 vp->v_type = VNON;
807 switch (imp->iso_ftype) {
808 default: /* ISO_FTYPE_9660 */
809 {
810 struct buf *bp2;
811 int off;
812 if ((imp->im_flags & ISOFSMNT_EXTATT)
813 && (off = isonum_711(isodir->ext_attr_length)))
814 cd9660_blkatoff(vp, (off_t)-(off << imp->im_bshift), NULL,
815 &bp2);
816 else
817 bp2 = NULL;
818 cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660);
819 cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660);
820 if (bp2)
821 brelse(bp2);
822 break;
823 }
824 case ISO_FTYPE_RRIP:
825 cd9660_rrip_analyze(isodir, ip, imp);
826 break;
827 }
828
829 brelse(bp);
830
831 /*
832 * Initialize the associated vnode
833 */
834 switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) {
835 case VFIFO:
836 vp->v_op = &cd9660_fifoops;
837 break;
838 default:
839 VN_LOCK_ASHARE(vp);
840 break;
841 }
842
843 if (ip->iso_extent == imp->root_extent)
844 vp->v_vflag |= VV_ROOT;
845
846 /*
847 * XXX need generation number?
848 */
849
850 vn_set_state(vp, VSTATE_CONSTRUCTED);
851 *vpp = vp;
852 return (0);
853 }
854