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: releng/10.0/sys/fs/cd9660/cd9660_vfsops.c 255867 2013-09-25 02:49:18Z jmg $");
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 = NULL;
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 = 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 struct iso_volume_descriptor *vdp = NULL;
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_LOOKUP_SHARED | MNTK_EXTENDED_SHARED;
383 MNT_IUNLOCK(mp);
384 isomp->im_mountp = mp;
385 isomp->im_dev = dev;
386 isomp->im_devvp = devvp;
387
388 vfs_flagopt(mp->mnt_optnew, "norrip", &isomp->im_flags, ISOFSMNT_NORRIP);
389 vfs_flagopt(mp->mnt_optnew, "gens", &isomp->im_flags, ISOFSMNT_GENS);
390 vfs_flagopt(mp->mnt_optnew, "extatt", &isomp->im_flags, ISOFSMNT_EXTATT);
391 vfs_flagopt(mp->mnt_optnew, "nojoliet", &isomp->im_flags, ISOFSMNT_NOJOLIET);
392 vfs_flagopt(mp->mnt_optnew, "kiconv", &isomp->im_flags, ISOFSMNT_KICONV);
393
394 /* Check the Rock Ridge Extension support */
395 if (!(isomp->im_flags & ISOFSMNT_NORRIP)) {
396 if ((error = bread(isomp->im_devvp, (isomp->root_extent +
397 isonum_711(((struct iso_directory_record *)isomp->root)->
398 ext_attr_length)) << (isomp->im_bshift - DEV_BSHIFT),
399 isomp->logical_block_size, NOCRED, &bp)) != 0)
400 goto out;
401
402 rootp = (struct iso_directory_record *)bp->b_data;
403
404 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) {
405 isomp->im_flags |= ISOFSMNT_NORRIP;
406 } else {
407 isomp->im_flags &= ~ISOFSMNT_GENS;
408 }
409
410 /*
411 * The contents are valid,
412 * but they will get reread as part of another vnode, so...
413 */
414 bp->b_flags |= B_AGE;
415 brelse(bp);
416 bp = NULL;
417 rootp = NULL;
418 }
419
420 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) {
421 cs_local = vfs_getopts(mp->mnt_optnew, "cs_local", &error);
422 if (error)
423 goto out;
424 cs_disk = vfs_getopts(mp->mnt_optnew, "cs_disk", &error);
425 if (error)
426 goto out;
427 cd9660_iconv->open(cs_local, cs_disk, &isomp->im_d2l);
428 cd9660_iconv->open(cs_disk, cs_local, &isomp->im_l2d);
429 } else {
430 isomp->im_d2l = NULL;
431 isomp->im_l2d = NULL;
432 }
433
434 if (high_sierra) {
435 /* this effectively ignores all the mount flags */
436 if (bootverbose)
437 log(LOG_INFO, "cd9660: High Sierra Format\n");
438 isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA;
439 } else
440 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) {
441 default:
442 isomp->iso_ftype = ISO_FTYPE_DEFAULT;
443 break;
444 case ISOFSMNT_GENS|ISOFSMNT_NORRIP:
445 isomp->iso_ftype = ISO_FTYPE_9660;
446 break;
447 case 0:
448 if (bootverbose)
449 log(LOG_INFO, "cd9660: RockRidge Extension\n");
450 isomp->iso_ftype = ISO_FTYPE_RRIP;
451 break;
452 }
453
454 /* Decide whether to use the Joliet descriptor */
455
456 if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) {
457 if (bootverbose)
458 log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n",
459 joliet_level);
460 rootp = (struct iso_directory_record *)
461 sup->root_directory_record;
462 bcopy (rootp, isomp->root, sizeof isomp->root);
463 isomp->root_extent = isonum_733 (rootp->extent);
464 isomp->root_size = isonum_733 (rootp->size);
465 isomp->joliet_level = joliet_level;
466 supbp->b_flags |= B_AGE;
467 }
468
469 if (supbp) {
470 brelse(supbp);
471 supbp = NULL;
472 sup = NULL;
473 }
474
475 return 0;
476 out:
477 if (bp)
478 brelse(bp);
479 if (pribp)
480 brelse(pribp);
481 if (supbp)
482 brelse(supbp);
483 if (cp != NULL) {
484 DROP_GIANT();
485 g_topology_lock();
486 g_vfs_close(cp);
487 g_topology_unlock();
488 PICKUP_GIANT();
489 }
490 if (isomp) {
491 free(isomp, M_ISOFSMNT);
492 mp->mnt_data = NULL;
493 }
494 dev_rel(dev);
495 return error;
496 }
497
498 /*
499 * unmount system call
500 */
501 static int
502 cd9660_unmount(mp, mntflags)
503 struct mount *mp;
504 int mntflags;
505 {
506 struct iso_mnt *isomp;
507 int error, flags = 0;
508
509 if (mntflags & MNT_FORCE)
510 flags |= FORCECLOSE;
511 if ((error = vflush(mp, 0, flags, curthread)))
512 return (error);
513
514 isomp = VFSTOISOFS(mp);
515
516 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) {
517 if (isomp->im_d2l)
518 cd9660_iconv->close(isomp->im_d2l);
519 if (isomp->im_l2d)
520 cd9660_iconv->close(isomp->im_l2d);
521 }
522 DROP_GIANT();
523 g_topology_lock();
524 g_vfs_close(isomp->im_cp);
525 g_topology_unlock();
526 PICKUP_GIANT();
527 vrele(isomp->im_devvp);
528 dev_rel(isomp->im_dev);
529 free(isomp, M_ISOFSMNT);
530 mp->mnt_data = NULL;
531 MNT_ILOCK(mp);
532 mp->mnt_flag &= ~MNT_LOCAL;
533 MNT_IUNLOCK(mp);
534 return (error);
535 }
536
537 /*
538 * Return root of a filesystem
539 */
540 static int
541 cd9660_root(mp, flags, vpp)
542 struct mount *mp;
543 int flags;
544 struct vnode **vpp;
545 {
546 struct iso_mnt *imp = VFSTOISOFS(mp);
547 struct iso_directory_record *dp =
548 (struct iso_directory_record *)imp->root;
549 ino_t ino = isodirino(dp, imp);
550
551 /*
552 * With RRIP we must use the `.' entry of the root directory.
553 * Simply tell vget, that it's a relocated directory.
554 */
555 return (cd9660_vget_internal(mp, ino, flags, vpp,
556 imp->iso_ftype == ISO_FTYPE_RRIP, dp));
557 }
558
559 /*
560 * Get filesystem statistics.
561 */
562 static int
563 cd9660_statfs(mp, sbp)
564 struct mount *mp;
565 struct statfs *sbp;
566 {
567 struct iso_mnt *isomp;
568
569 isomp = VFSTOISOFS(mp);
570
571 sbp->f_bsize = isomp->logical_block_size;
572 sbp->f_iosize = sbp->f_bsize; /* XXX */
573 sbp->f_blocks = isomp->volume_space_size;
574 sbp->f_bfree = 0; /* total free blocks */
575 sbp->f_bavail = 0; /* blocks free for non superuser */
576 sbp->f_files = 0; /* total files */
577 sbp->f_ffree = 0; /* free file nodes */
578 return 0;
579 }
580
581 /*
582 * File handle to vnode
583 *
584 * Have to be really careful about stale file handles:
585 * - check that the inode number is in range
586 * - call iget() to get the locked inode
587 * - check for an unallocated inode (i_mode == 0)
588 * - check that the generation number matches
589 */
590
591 /* ARGSUSED */
592 static int
593 cd9660_fhtovp(mp, fhp, flags, vpp)
594 struct mount *mp;
595 struct fid *fhp;
596 int flags;
597 struct vnode **vpp;
598 {
599 struct ifid ifh;
600 struct iso_node *ip;
601 struct vnode *nvp;
602 int error;
603
604 memcpy(&ifh, fhp, sizeof(ifh));
605
606 #ifdef ISOFS_DBG
607 printf("fhtovp: ino %d, start %ld\n",
608 ifh.ifid_ino, ifh.ifid_start);
609 #endif
610
611 if ((error = VFS_VGET(mp, ifh.ifid_ino, LK_EXCLUSIVE, &nvp)) != 0) {
612 *vpp = NULLVP;
613 return (error);
614 }
615 ip = VTOI(nvp);
616 if (ip->inode.iso_mode == 0) {
617 vput(nvp);
618 *vpp = NULLVP;
619 return (ESTALE);
620 }
621 *vpp = nvp;
622 vnode_create_vobject(*vpp, ip->i_size, curthread);
623 return (0);
624 }
625
626 static int
627 cd9660_vget(mp, ino, flags, vpp)
628 struct mount *mp;
629 ino_t ino;
630 int flags;
631 struct vnode **vpp;
632 {
633
634 /*
635 * XXXX
636 * It would be nice if we didn't always set the `relocated' flag
637 * and force the extra read, but I don't want to think about fixing
638 * that right now.
639 */
640 return (cd9660_vget_internal(mp, ino, flags, vpp,
641 #if 0
642 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP,
643 #else
644 0,
645 #endif
646 (struct iso_directory_record *)0));
647 }
648
649 int
650 cd9660_vget_internal(mp, ino, flags, vpp, relocated, isodir)
651 struct mount *mp;
652 ino_t ino;
653 int flags;
654 struct vnode **vpp;
655 int relocated;
656 struct iso_directory_record *isodir;
657 {
658 struct iso_mnt *imp;
659 struct iso_node *ip;
660 struct buf *bp;
661 struct vnode *vp;
662 struct cdev *dev;
663 int error;
664 struct thread *td;
665
666 td = curthread;
667 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL);
668 if (error || *vpp != NULL)
669 return (error);
670
671 /*
672 * We must promote to an exclusive lock for vnode creation. This
673 * can happen if lookup is passed LOCKSHARED.
674 */
675 if ((flags & LK_TYPE_MASK) == LK_SHARED) {
676 flags &= ~LK_TYPE_MASK;
677 flags |= LK_EXCLUSIVE;
678 }
679
680 /*
681 * We do not lock vnode creation as it is believed to be too
682 * expensive for such rare case as simultaneous creation of vnode
683 * for same ino by different processes. We just allow them to race
684 * and check later to decide who wins. Let the race begin!
685 */
686
687 imp = VFSTOISOFS(mp);
688 dev = imp->im_dev;
689
690 /* Allocate a new vnode/iso_node. */
691 if ((error = getnewvnode("isofs", mp, &cd9660_vnodeops, &vp)) != 0) {
692 *vpp = NULLVP;
693 return (error);
694 }
695 ip = malloc(sizeof(struct iso_node), M_ISOFSNODE,
696 M_WAITOK | M_ZERO);
697 vp->v_data = ip;
698 ip->i_vnode = vp;
699 ip->i_number = ino;
700
701 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
702 error = insmntque(vp, mp);
703 if (error != 0) {
704 free(ip, M_ISOFSNODE);
705 *vpp = NULLVP;
706 return (error);
707 }
708 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
709 if (error || *vpp != NULL)
710 return (error);
711
712 if (isodir == 0) {
713 int lbn, off;
714
715 lbn = lblkno(imp, ino);
716 if (lbn >= imp->volume_space_size) {
717 vput(vp);
718 printf("fhtovp: lbn exceed volume space %d\n", lbn);
719 return (ESTALE);
720 }
721
722 off = blkoff(imp, ino);
723 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) {
724 vput(vp);
725 printf("fhtovp: crosses block boundary %d\n",
726 off + ISO_DIRECTORY_RECORD_SIZE);
727 return (ESTALE);
728 }
729
730 error = bread(imp->im_devvp,
731 lbn << (imp->im_bshift - DEV_BSHIFT),
732 imp->logical_block_size, NOCRED, &bp);
733 if (error) {
734 vput(vp);
735 brelse(bp);
736 printf("fhtovp: bread error %d\n",error);
737 return (error);
738 }
739 isodir = (struct iso_directory_record *)(bp->b_data + off);
740
741 if (off + isonum_711(isodir->length) >
742 imp->logical_block_size) {
743 vput(vp);
744 if (bp != 0)
745 brelse(bp);
746 printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n",
747 off +isonum_711(isodir->length), off,
748 isonum_711(isodir->length));
749 return (ESTALE);
750 }
751
752 #if 0
753 if (isonum_733(isodir->extent) +
754 isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) {
755 if (bp != 0)
756 brelse(bp);
757 printf("fhtovp: file start miss %d vs %d\n",
758 isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length),
759 ifhp->ifid_start);
760 return (ESTALE);
761 }
762 #endif
763 } else
764 bp = 0;
765
766 ip->i_mnt = imp;
767
768 if (relocated) {
769 /*
770 * On relocated directories we must
771 * read the `.' entry out of a dir.
772 */
773 ip->iso_start = ino >> imp->im_bshift;
774 if (bp != 0)
775 brelse(bp);
776 if ((error = cd9660_blkatoff(vp, (off_t)0, NULL, &bp)) != 0) {
777 vput(vp);
778 return (error);
779 }
780 isodir = (struct iso_directory_record *)bp->b_data;
781 }
782
783 ip->iso_extent = isonum_733(isodir->extent);
784 ip->i_size = isonum_733(isodir->size);
785 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent;
786
787 /*
788 * Setup time stamp, attribute
789 */
790 vp->v_type = VNON;
791 switch (imp->iso_ftype) {
792 default: /* ISO_FTYPE_9660 */
793 {
794 struct buf *bp2;
795 int off;
796 if ((imp->im_flags & ISOFSMNT_EXTATT)
797 && (off = isonum_711(isodir->ext_attr_length)))
798 cd9660_blkatoff(vp, (off_t)-(off << imp->im_bshift), NULL,
799 &bp2);
800 else
801 bp2 = NULL;
802 cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660);
803 cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660);
804 if (bp2)
805 brelse(bp2);
806 break;
807 }
808 case ISO_FTYPE_RRIP:
809 cd9660_rrip_analyze(isodir, ip, imp);
810 break;
811 }
812
813 if (bp != 0)
814 brelse(bp);
815
816 /*
817 * Initialize the associated vnode
818 */
819 switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) {
820 case VFIFO:
821 vp->v_op = &cd9660_fifoops;
822 break;
823 default:
824 VN_LOCK_ASHARE(vp);
825 break;
826 }
827
828 if (ip->iso_extent == imp->root_extent)
829 vp->v_vflag |= VV_ROOT;
830
831 /*
832 * XXX need generation number?
833 */
834
835 *vpp = vp;
836 return (0);
837 }
Cache object: 71864dfba96c1f569a332b70fa66eaed
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