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