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