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 __FBSDID("$FreeBSD: stable/12/sys/fs/cd9660/cd9660_vfsops.c 373192 2023-09-06 21:58:16Z jhb $");
41
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/namei.h>
45 #include <sys/priv.h>
46 #include <sys/proc.h>
47 #include <sys/kernel.h>
48 #include <sys/vnode.h>
49 #include <sys/mount.h>
50 #include <sys/bio.h>
51 #include <sys/buf.h>
52 #include <sys/cdio.h>
53 #include <sys/conf.h>
54 #include <sys/fcntl.h>
55 #include <sys/malloc.h>
56 #include <sys/stat.h>
57 #include <sys/syslog.h>
58 #include <sys/iconv.h>
59
60 #include <fs/cd9660/iso.h>
61 #include <fs/cd9660/iso_rrip.h>
62 #include <fs/cd9660/cd9660_node.h>
63 #include <fs/cd9660/cd9660_mount.h>
64
65 #include <geom/geom.h>
66 #include <geom/geom_vfs.h>
67
68 MALLOC_DEFINE(M_ISOFSMNT, "isofs_mount", "ISOFS mount structure");
69 MALLOC_DEFINE(M_ISOFSNODE, "isofs_node", "ISOFS vnode private part");
70
71 struct iconv_functions *cd9660_iconv = NULL;
72
73 static vfs_mount_t cd9660_mount;
74 static vfs_cmount_t cd9660_cmount;
75 static vfs_unmount_t cd9660_unmount;
76 static vfs_root_t cd9660_root;
77 static vfs_statfs_t cd9660_statfs;
78 static vfs_vget_t cd9660_vget;
79 static vfs_fhtovp_t cd9660_fhtovp;
80
81 static struct vfsops cd9660_vfsops = {
82 .vfs_fhtovp = cd9660_fhtovp,
83 .vfs_mount = cd9660_mount,
84 .vfs_cmount = cd9660_cmount,
85 .vfs_root = cd9660_root,
86 .vfs_statfs = cd9660_statfs,
87 .vfs_unmount = cd9660_unmount,
88 .vfs_vget = cd9660_vget,
89 };
90 VFS_SET(cd9660_vfsops, cd9660, VFCF_READONLY);
91 MODULE_VERSION(cd9660, 1);
92
93 static int cd9660_vfs_hash_cmp(struct vnode *vp, void *pino);
94 static int iso_mountfs(struct vnode *devvp, struct mount *mp);
95
96 /*
97 * VFS Operations.
98 */
99
100 static int
cd9660_cmount(struct mntarg * ma,void * data,uint64_t flags)101 cd9660_cmount(struct mntarg *ma, void *data, uint64_t flags)
102 {
103 struct iso_args args;
104 struct export_args exp;
105 int error;
106
107 error = copyin(data, &args, sizeof args);
108 if (error)
109 return (error);
110 vfs_oexport_conv(&args.export, &exp);
111
112 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN);
113 ma = mount_arg(ma, "export", &exp, sizeof(exp));
114 ma = mount_argsu(ma, "cs_disk", args.cs_disk, 64);
115 ma = mount_argsu(ma, "cs_local", args.cs_local, 64);
116 ma = mount_argf(ma, "ssector", "%u", args.ssector);
117 ma = mount_argb(ma, !(args.flags & ISOFSMNT_NORRIP), "norrip");
118 ma = mount_argb(ma, args.flags & ISOFSMNT_GENS, "nogens");
119 ma = mount_argb(ma, args.flags & ISOFSMNT_EXTATT, "noextatt");
120 ma = mount_argb(ma, !(args.flags & ISOFSMNT_NOJOLIET), "nojoliet");
121 ma = mount_argb(ma,
122 args.flags & ISOFSMNT_BROKENJOLIET, "nobrokenjoliet");
123 ma = mount_argb(ma, args.flags & ISOFSMNT_KICONV, "nokiconv");
124
125 error = kernel_mount(ma, flags);
126
127 return (error);
128 }
129
130 static int
cd9660_mount(struct mount * mp)131 cd9660_mount(struct mount *mp)
132 {
133 struct vnode *devvp;
134 struct thread *td;
135 char *fspec;
136 int error;
137 accmode_t accmode;
138 struct nameidata ndp;
139 struct iso_mnt *imp = NULL;
140
141 td = curthread;
142
143 /*
144 * Unconditionally mount as read-only.
145 */
146 MNT_ILOCK(mp);
147 mp->mnt_flag |= MNT_RDONLY;
148 MNT_IUNLOCK(mp);
149
150 fspec = vfs_getopts(mp->mnt_optnew, "from", &error);
151 if (error)
152 return (error);
153
154 imp = VFSTOISOFS(mp);
155
156 if (mp->mnt_flag & MNT_UPDATE) {
157 if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0))
158 return (0);
159 }
160 /*
161 * Not an update, or updating the name: look up the name
162 * and verify that it refers to a sensible block device.
163 */
164 NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td);
165 if ((error = namei(&ndp)))
166 return (error);
167 NDFREE(&ndp, NDF_ONLY_PNBUF);
168 devvp = ndp.ni_vp;
169
170 if (!vn_isdisk(devvp, &error)) {
171 vput(devvp);
172 return (error);
173 }
174
175 /*
176 * Verify that user has necessary permissions on the device,
177 * or has superuser abilities
178 */
179 accmode = VREAD;
180 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td);
181 if (error)
182 error = priv_check(td, PRIV_VFS_MOUNT_PERM);
183 if (error) {
184 vput(devvp);
185 return (error);
186 }
187
188 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
189 error = iso_mountfs(devvp, mp);
190 if (error)
191 vrele(devvp);
192 } else {
193 if (devvp != imp->im_devvp)
194 error = EINVAL; /* needs translation */
195 vput(devvp);
196 }
197 if (error)
198 return (error);
199 vfs_mountedfrom(mp, fspec);
200 return (0);
201 }
202
203 /*
204 * Common code for mount and mountroot
205 */
206 static int
iso_mountfs(devvp,mp)207 iso_mountfs(devvp, mp)
208 struct vnode *devvp;
209 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
231 dev = devvp->v_rdev;
232 dev_ref(dev);
233 g_topology_lock();
234 error = g_vfs_open(devvp, &cp, "cd9660", 0);
235 if (error == 0)
236 g_getattr("MNT::verified", cp, &isverified);
237 g_topology_unlock();
238 VOP_UNLOCK(devvp, 0);
239 if (error)
240 goto out;
241 if (devvp->v_rdev->si_iosize_max != 0)
242 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
243 if (mp->mnt_iosize_max > MAXPHYS)
244 mp->mnt_iosize_max = MAXPHYS;
245
246 bo = &devvp->v_bufobj;
247
248 /* This is the "logical sector size". The standard says this
249 * should be 2048 or the physical sector size on the device,
250 * whichever is greater.
251 */
252 if ((ISO_DEFAULT_BLOCK_SIZE % cp->provider->sectorsize) != 0) {
253 error = EINVAL;
254 goto out;
255 }
256
257 iso_bsize = cp->provider->sectorsize;
258
259 joliet_level = 0;
260 if (1 != vfs_scanopt(mp->mnt_optnew, "ssector", "%d", &ssector))
261 ssector = 0;
262 for (iso_blknum = 16 + ssector;
263 iso_blknum < 100 + ssector;
264 iso_blknum++) {
265 if ((error = bread(devvp, iso_blknum * btodb(ISO_DEFAULT_BLOCK_SIZE),
266 iso_bsize, NOCRED, &bp)) != 0)
267 goto out;
268
269 vdp = (struct iso_volume_descriptor *)bp->b_data;
270 if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) {
271 if (bcmp (vdp->id_sierra, ISO_SIERRA_ID,
272 sizeof vdp->id_sierra) != 0) {
273 error = EINVAL;
274 goto out;
275 } else
276 high_sierra = 1;
277 }
278 switch (isonum_711 (high_sierra? vdp->type_sierra: vdp->type)){
279 case ISO_VD_PRIMARY:
280 if (pribp == NULL) {
281 pribp = bp;
282 bp = NULL;
283 pri = (struct iso_primary_descriptor *)vdp;
284 pri_sierra =
285 (struct iso_sierra_primary_descriptor *)vdp;
286 }
287 break;
288
289 case ISO_VD_SUPPLEMENTARY:
290 if (supbp == NULL) {
291 supbp = bp;
292 bp = NULL;
293 sup = (struct iso_supplementary_descriptor *)vdp;
294
295 if (!vfs_flagopt(mp->mnt_optnew, "nojoliet", NULL, 0)) {
296 if (bcmp(sup->escape, "%/@", 3) == 0)
297 joliet_level = 1;
298 if (bcmp(sup->escape, "%/C", 3) == 0)
299 joliet_level = 2;
300 if (bcmp(sup->escape, "%/E", 3) == 0)
301 joliet_level = 3;
302
303 if ((isonum_711 (sup->flags) & 1) &&
304 !vfs_flagopt(mp->mnt_optnew, "brokenjoliet", NULL, 0))
305 joliet_level = 0;
306 }
307 }
308 break;
309
310 case ISO_VD_END:
311 goto vd_end;
312
313 default:
314 break;
315 }
316 if (bp != NULL) {
317 brelse(bp);
318 bp = NULL;
319 }
320 }
321 vd_end:
322 if (bp != NULL) {
323 brelse(bp);
324 bp = NULL;
325 }
326
327 if (pri == NULL) {
328 error = EINVAL;
329 goto out;
330 }
331
332 logical_block_size =
333 isonum_723 (high_sierra?
334 pri_sierra->logical_block_size:
335 pri->logical_block_size);
336
337 if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE
338 || (logical_block_size & (logical_block_size - 1)) != 0) {
339 error = EINVAL;
340 goto out;
341 }
342
343 if (logical_block_size < cp->provider->sectorsize) {
344 printf("cd9660: Unsupported logical block size %u\n",
345 logical_block_size);
346 error = EINVAL;
347 goto out;
348 }
349
350 rootp = (struct iso_directory_record *)
351 (high_sierra?
352 pri_sierra->root_directory_record:
353 pri->root_directory_record);
354
355 isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO);
356 isomp->im_cp = cp;
357 isomp->im_bo = bo;
358 isomp->logical_block_size = logical_block_size;
359 isomp->volume_space_size =
360 isonum_733 (high_sierra?
361 pri_sierra->volume_space_size:
362 pri->volume_space_size);
363 isomp->joliet_level = 0;
364 /*
365 * Since an ISO9660 multi-session CD can also access previous
366 * sessions, we have to include them into the space consider-
367 * ations. This doesn't yield a very accurate number since
368 * parts of the old sessions might be inaccessible now, but we
369 * can't do much better. This is also important for the NFS
370 * filehandle validation.
371 */
372 isomp->volume_space_size += ssector;
373 memcpy(isomp->root, rootp, sizeof isomp->root);
374 isomp->root_extent = isonum_733 (rootp->extent);
375 isomp->root_size = isonum_733 (rootp->size);
376
377 isomp->im_bmask = logical_block_size - 1;
378 isomp->im_bshift = ffs(logical_block_size) - 1;
379
380 pribp->b_flags |= B_AGE;
381 brelse(pribp);
382 pribp = NULL;
383 rootp = NULL;
384 pri = NULL;
385 pri_sierra = NULL;
386
387 mp->mnt_data = isomp;
388 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
389 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
390 mp->mnt_maxsymlinklen = 0;
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
401 vfs_flagopt(mp->mnt_optnew, "norrip", &isomp->im_flags, ISOFSMNT_NORRIP);
402 vfs_flagopt(mp->mnt_optnew, "gens", &isomp->im_flags, ISOFSMNT_GENS);
403 vfs_flagopt(mp->mnt_optnew, "extatt", &isomp->im_flags, ISOFSMNT_EXTATT);
404 vfs_flagopt(mp->mnt_optnew, "nojoliet", &isomp->im_flags, ISOFSMNT_NOJOLIET);
405 vfs_flagopt(mp->mnt_optnew, "kiconv", &isomp->im_flags, ISOFSMNT_KICONV);
406
407 /* Check the Rock Ridge Extension support */
408 if (!(isomp->im_flags & ISOFSMNT_NORRIP)) {
409 if ((error = bread(isomp->im_devvp, (isomp->root_extent +
410 isonum_711(((struct iso_directory_record *)isomp->root)->
411 ext_attr_length)) << (isomp->im_bshift - DEV_BSHIFT),
412 isomp->logical_block_size, NOCRED, &bp)) != 0)
413 goto out;
414
415 rootp = (struct iso_directory_record *)bp->b_data;
416
417 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) {
418 isomp->im_flags |= ISOFSMNT_NORRIP;
419 } else {
420 isomp->im_flags &= ~ISOFSMNT_GENS;
421 }
422
423 /*
424 * The contents are valid,
425 * but they will get reread as part of another vnode, so...
426 */
427 bp->b_flags |= B_AGE;
428 brelse(bp);
429 bp = NULL;
430 rootp = NULL;
431 }
432
433 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) {
434 cs_local = vfs_getopts(mp->mnt_optnew, "cs_local", &error);
435 if (error)
436 goto out;
437 cs_disk = vfs_getopts(mp->mnt_optnew, "cs_disk", &error);
438 if (error)
439 goto out;
440 cd9660_iconv->open(cs_local, cs_disk, &isomp->im_d2l);
441 cd9660_iconv->open(cs_disk, cs_local, &isomp->im_l2d);
442 } else {
443 isomp->im_d2l = NULL;
444 isomp->im_l2d = NULL;
445 }
446
447 if (high_sierra) {
448 /* this effectively ignores all the mount flags */
449 if (bootverbose)
450 log(LOG_INFO, "cd9660: High Sierra Format\n");
451 isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA;
452 } else
453 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) {
454 default:
455 isomp->iso_ftype = ISO_FTYPE_DEFAULT;
456 break;
457 case ISOFSMNT_GENS|ISOFSMNT_NORRIP:
458 isomp->iso_ftype = ISO_FTYPE_9660;
459 break;
460 case 0:
461 if (bootverbose)
462 log(LOG_INFO, "cd9660: RockRidge Extension\n");
463 isomp->iso_ftype = ISO_FTYPE_RRIP;
464 break;
465 }
466
467 /* Decide whether to use the Joliet descriptor */
468
469 if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) {
470 if (bootverbose)
471 log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n",
472 joliet_level);
473 rootp = (struct iso_directory_record *)
474 sup->root_directory_record;
475 memcpy(isomp->root, rootp, sizeof isomp->root);
476 isomp->root_extent = isonum_733 (rootp->extent);
477 isomp->root_size = isonum_733 (rootp->size);
478 isomp->joliet_level = joliet_level;
479 supbp->b_flags |= B_AGE;
480 }
481
482 if (supbp) {
483 brelse(supbp);
484 supbp = NULL;
485 sup = NULL;
486 }
487
488 return 0;
489 out:
490 if (bp != NULL)
491 brelse(bp);
492 if (pribp != NULL)
493 brelse(pribp);
494 if (supbp != NULL)
495 brelse(supbp);
496 if (cp != NULL) {
497 g_topology_lock();
498 g_vfs_close(cp);
499 g_topology_unlock();
500 }
501 if (isomp) {
502 free(isomp, M_ISOFSMNT);
503 mp->mnt_data = NULL;
504 }
505 dev_rel(dev);
506 return error;
507 }
508
509 /*
510 * unmount system call
511 */
512 static int
cd9660_unmount(mp,mntflags)513 cd9660_unmount(mp, mntflags)
514 struct mount *mp;
515 int mntflags;
516 {
517 struct iso_mnt *isomp;
518 int error, flags = 0;
519
520 if (mntflags & MNT_FORCE)
521 flags |= FORCECLOSE;
522 if ((error = vflush(mp, 0, flags, curthread)))
523 return (error);
524
525 isomp = VFSTOISOFS(mp);
526
527 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) {
528 if (isomp->im_d2l)
529 cd9660_iconv->close(isomp->im_d2l);
530 if (isomp->im_l2d)
531 cd9660_iconv->close(isomp->im_l2d);
532 }
533 g_topology_lock();
534 g_vfs_close(isomp->im_cp);
535 g_topology_unlock();
536 vrele(isomp->im_devvp);
537 dev_rel(isomp->im_dev);
538 free(isomp, M_ISOFSMNT);
539 mp->mnt_data = NULL;
540 MNT_ILOCK(mp);
541 mp->mnt_flag &= ~MNT_LOCAL;
542 MNT_IUNLOCK(mp);
543 return (error);
544 }
545
546 /*
547 * Return root of a filesystem
548 */
549 static int
cd9660_root(mp,flags,vpp)550 cd9660_root(mp, flags, vpp)
551 struct mount *mp;
552 int flags;
553 struct vnode **vpp;
554 {
555 struct iso_mnt *imp = VFSTOISOFS(mp);
556 struct iso_directory_record *dp =
557 (struct iso_directory_record *)imp->root;
558 cd_ino_t ino = isodirino(dp, imp);
559
560 /*
561 * With RRIP we must use the `.' entry of the root directory.
562 * Simply tell vget, that it's a relocated directory.
563 */
564 return (cd9660_vget_internal(mp, ino, flags, vpp,
565 imp->iso_ftype == ISO_FTYPE_RRIP, dp));
566 }
567
568 /*
569 * Get filesystem statistics.
570 */
571 static int
cd9660_statfs(mp,sbp)572 cd9660_statfs(mp, sbp)
573 struct mount *mp;
574 struct statfs *sbp;
575 {
576 struct iso_mnt *isomp;
577
578 isomp = VFSTOISOFS(mp);
579
580 sbp->f_bsize = isomp->logical_block_size;
581 sbp->f_iosize = sbp->f_bsize; /* XXX */
582 sbp->f_blocks = isomp->volume_space_size;
583 sbp->f_bfree = 0; /* total free blocks */
584 sbp->f_bavail = 0; /* blocks free for non superuser */
585 sbp->f_files = 0; /* total files */
586 sbp->f_ffree = 0; /* free file nodes */
587 return 0;
588 }
589
590 /*
591 * File handle to vnode
592 *
593 * Have to be really careful about stale file handles:
594 * - check that the inode number is in range
595 * - call iget() to get the locked inode
596 * - check for an unallocated inode (i_mode == 0)
597 * - check that the generation number matches
598 */
599
600 /* ARGSUSED */
601 static int
cd9660_fhtovp(mp,fhp,flags,vpp)602 cd9660_fhtovp(mp, fhp, flags, vpp)
603 struct mount *mp;
604 struct fid *fhp;
605 int flags;
606 struct vnode **vpp;
607 {
608 struct ifid ifh;
609 struct iso_node *ip;
610 struct vnode *nvp;
611 int error;
612
613 memcpy(&ifh, fhp, sizeof(ifh));
614
615 #ifdef ISOFS_DBG
616 printf("fhtovp: ino %d, start %ld\n",
617 ifh.ifid_ino, ifh.ifid_start);
618 #endif
619
620 if ((error = VFS_VGET(mp, ifh.ifid_ino, LK_EXCLUSIVE, &nvp)) != 0) {
621 *vpp = NULLVP;
622 return (error);
623 }
624 ip = VTOI(nvp);
625 if (ip->inode.iso_mode == 0) {
626 vput(nvp);
627 *vpp = NULLVP;
628 return (ESTALE);
629 }
630 *vpp = nvp;
631 vnode_create_vobject(*vpp, ip->i_size, curthread);
632 return (0);
633 }
634
635 /*
636 * Conform to standard VFS interface; can't vget arbitrary inodes beyond 4GB
637 * into media with current inode scheme and 32-bit ino_t. This shouldn't be
638 * needed for anything other than nfsd, and who exports a mounted DVD over NFS?
639 */
640 static int
cd9660_vget(mp,ino,flags,vpp)641 cd9660_vget(mp, ino, flags, vpp)
642 struct mount *mp;
643 ino_t ino;
644 int flags;
645 struct vnode **vpp;
646 {
647
648 /*
649 * XXXX
650 * It would be nice if we didn't always set the `relocated' flag
651 * and force the extra read, but I don't want to think about fixing
652 * that right now.
653 */
654 return (cd9660_vget_internal(mp, ino, flags, vpp,
655 #if 0
656 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP,
657 #else
658 0,
659 #endif
660 (struct iso_directory_record *)0));
661 }
662
663 /* Use special comparator for full 64-bit ino comparison. */
664 static int
cd9660_vfs_hash_cmp(vp,pino)665 cd9660_vfs_hash_cmp(vp, pino)
666 struct vnode *vp;
667 void *pino;
668 {
669 struct iso_node *ip;
670 cd_ino_t ino;
671
672 ip = VTOI(vp);
673 ino = *(cd_ino_t *)pino;
674 return (ip->i_number != ino);
675 }
676
677 int
cd9660_vget_internal(mp,ino,flags,vpp,relocated,isodir)678 cd9660_vget_internal(mp, ino, flags, vpp, relocated, isodir)
679 struct mount *mp;
680 cd_ino_t ino;
681 int flags;
682 struct vnode **vpp;
683 int relocated;
684 struct iso_directory_record *isodir;
685 {
686 struct iso_mnt *imp;
687 struct iso_node *ip;
688 struct buf *bp;
689 struct vnode *vp;
690 int error;
691 struct thread *td;
692
693 td = curthread;
694 error = vfs_hash_get(mp, ino, flags, td, vpp, cd9660_vfs_hash_cmp,
695 &ino);
696 if (error || *vpp != NULL)
697 return (error);
698
699 /*
700 * We must promote to an exclusive lock for vnode creation. This
701 * can happen if lookup is passed LOCKSHARED.
702 */
703 if ((flags & LK_TYPE_MASK) == LK_SHARED) {
704 flags &= ~LK_TYPE_MASK;
705 flags |= LK_EXCLUSIVE;
706 }
707
708 /*
709 * We do not lock vnode creation as it is believed to be too
710 * expensive for such rare case as simultaneous creation of vnode
711 * for same ino by different processes. We just allow them to race
712 * and check later to decide who wins. Let the race begin!
713 */
714
715 imp = VFSTOISOFS(mp);
716
717 /* Allocate a new vnode/iso_node. */
718 if ((error = getnewvnode("isofs", mp, &cd9660_vnodeops, &vp)) != 0) {
719 *vpp = NULLVP;
720 return (error);
721 }
722 ip = malloc(sizeof(struct iso_node), M_ISOFSNODE,
723 M_WAITOK | M_ZERO);
724 vp->v_data = ip;
725 ip->i_vnode = vp;
726 ip->i_number = ino;
727
728 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
729 error = insmntque(vp, mp);
730 if (error != 0) {
731 free(ip, M_ISOFSNODE);
732 *vpp = NULLVP;
733 return (error);
734 }
735 error = vfs_hash_insert(vp, ino, flags, td, vpp, cd9660_vfs_hash_cmp,
736 &ino);
737 if (error || *vpp != NULL)
738 return (error);
739
740 if (isodir == NULL) {
741 int lbn, off;
742
743 lbn = lblkno(imp, ino);
744 if (lbn >= imp->volume_space_size) {
745 vput(vp);
746 printf("fhtovp: lbn exceed volume space %d\n", lbn);
747 return (ESTALE);
748 }
749
750 off = blkoff(imp, ino);
751 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) {
752 vput(vp);
753 printf("fhtovp: crosses block boundary %d\n",
754 off + ISO_DIRECTORY_RECORD_SIZE);
755 return (ESTALE);
756 }
757
758 error = bread(imp->im_devvp,
759 lbn << (imp->im_bshift - DEV_BSHIFT),
760 imp->logical_block_size, NOCRED, &bp);
761 if (error) {
762 vput(vp);
763 brelse(bp);
764 printf("fhtovp: bread error %d\n",error);
765 return (error);
766 }
767 isodir = (struct iso_directory_record *)(bp->b_data + off);
768
769 if (off + isonum_711(isodir->length) >
770 imp->logical_block_size) {
771 vput(vp);
772 brelse(bp);
773 printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n",
774 off +isonum_711(isodir->length), off,
775 isonum_711(isodir->length));
776 return (ESTALE);
777 }
778
779 #if 0
780 if (isonum_733(isodir->extent) +
781 isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) {
782 brelse(bp);
783 printf("fhtovp: file start miss %d vs %d\n",
784 isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length),
785 ifhp->ifid_start);
786 return (ESTALE);
787 }
788 #endif
789 } else
790 bp = NULL;
791
792 ip->i_mnt = imp;
793
794 if (relocated) {
795 /*
796 * On relocated directories we must
797 * read the `.' entry out of a dir.
798 */
799 ip->iso_start = ino >> imp->im_bshift;
800 if (bp != NULL)
801 brelse(bp);
802 if ((error = cd9660_blkatoff(vp, (off_t)0, NULL, &bp)) != 0) {
803 vput(vp);
804 return (error);
805 }
806 isodir = (struct iso_directory_record *)bp->b_data;
807 }
808
809 ip->iso_extent = isonum_733(isodir->extent);
810 ip->i_size = isonum_733(isodir->size);
811 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent;
812
813 /*
814 * Setup time stamp, attribute
815 */
816 vp->v_type = VNON;
817 switch (imp->iso_ftype) {
818 default: /* ISO_FTYPE_9660 */
819 {
820 struct buf *bp2;
821 int off;
822 if ((imp->im_flags & ISOFSMNT_EXTATT)
823 && (off = isonum_711(isodir->ext_attr_length)))
824 cd9660_blkatoff(vp, (off_t)-(off << imp->im_bshift), NULL,
825 &bp2);
826 else
827 bp2 = NULL;
828 cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660);
829 cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660);
830 if (bp2)
831 brelse(bp2);
832 break;
833 }
834 case ISO_FTYPE_RRIP:
835 cd9660_rrip_analyze(isodir, ip, imp);
836 break;
837 }
838
839 brelse(bp);
840
841 /*
842 * Initialize the associated vnode
843 */
844 switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) {
845 case VFIFO:
846 vp->v_op = &cd9660_fifoops;
847 break;
848 default:
849 VN_LOCK_ASHARE(vp);
850 break;
851 }
852
853 if (ip->iso_extent == imp->root_extent)
854 vp->v_vflag |= VV_ROOT;
855
856 /*
857 * XXX need generation number?
858 */
859
860 *vpp = vp;
861 return (0);
862 }
863