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3eb9e4a134f14e0afdff9cb76a94f43e6e932e20
[dragonfly.git] / sys / vfs / isofs / cd9660 / cd9660_vfsops.c
blob3eb9e4a134f14e0afdff9cb76a94f43e6e932e20
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 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)cd9660_vfsops.c 8.18 (Berkeley) 5/22/95
39 * $FreeBSD: src/sys/isofs/cd9660/cd9660_vfsops.c,v 1.74.2.7 2002/04/08 09:39:29 bde Exp $
40 * $DragonFly: src/sys/vfs/isofs/cd9660/cd9660_vfsops.c,v 1.45 2008/01/05 14:02:41 swildner Exp $
41 */
42
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/proc.h>
46 #include <sys/nlookup.h>
47 #include <sys/kernel.h>
48 #include <sys/vnode.h>
49 #include <sys/mount.h>
50 #include <sys/buf.h>
51 #include <sys/cdio.h>
52 #include <sys/conf.h>
53 #include <sys/fcntl.h>
54 #include <sys/malloc.h>
55 #include <sys/stat.h>
56 #include <sys/syslog.h>
57
58 #include <vm/vm_zone.h>
59
60 #include "iso.h"
61 #include "iso_rrip.h"
62 #include "cd9660_node.h"
63 #include "cd9660_mount.h"
64
65 extern struct vop_ops cd9660_vnode_vops;
66 extern struct vop_ops cd9660_spec_vops;
67 extern struct vop_ops cd9660_fifo_vops;
68
69 MALLOC_DEFINE(M_ISOFSMNT, "ISOFS mount", "ISOFS mount structure");
70 MALLOC_DEFINE(M_ISOFSNODE, "ISOFS node", "ISOFS vnode private part");
71
72 static int cd9660_mount (struct mount *, char *, caddr_t, struct ucred *);
73 static int cd9660_unmount (struct mount *, int);
74 static int cd9660_root (struct mount *, struct vnode **);
75 static int cd9660_statfs (struct mount *, struct statfs *, struct ucred *);
76 static int cd9660_vget (struct mount *, ino_t, struct vnode **);
77 static int cd9660_fhtovp (struct mount *, struct fid *, struct vnode **);
78 static int cd9660_checkexp (struct mount *, struct sockaddr *,
79 int *, struct ucred **);
80 static int cd9660_vptofh (struct vnode *, struct fid *);
81
82 static struct vfsops cd9660_vfsops = {
83 .vfs_mount = cd9660_mount,
84 .vfs_unmount = cd9660_unmount,
85 .vfs_root = cd9660_root,
86 .vfs_statfs = cd9660_statfs,
87 .vfs_sync = vfs_stdsync,
88 .vfs_vget = cd9660_vget,
89 .vfs_fhtovp = cd9660_fhtovp,
90 .vfs_checkexp = cd9660_checkexp,
91 .vfs_vptofh = cd9660_vptofh,
92 .vfs_init = cd9660_init,
93 .vfs_uninit = cd9660_uninit,
94 };
95 VFS_SET(cd9660_vfsops, cd9660, VFCF_READONLY);
96 MODULE_VERSION(cd9660, 1);
97
98
99 /*
100 * Called by vfs_mountroot when iso is going to be mounted as root.
101 */
102
103 static int iso_get_ssector (cdev_t dev);
104 static int iso_mountfs (struct vnode *devvp, struct mount *mp,
105 struct iso_args *argp);
106
107 /*
108 * Try to find the start of the last data track on this CD-ROM. This
109 * is used to mount the last session of a multi-session CD. Bail out
110 * and return 0 if we fail, this is always a safe bet.
111 */
112 static int
113 iso_get_ssector(cdev_t dev)
114 {
115 struct ioc_toc_header h;
116 struct ioc_read_toc_single_entry t;
117 int i;
118
119 if (dev_dioctl(dev, CDIOREADTOCHEADER, (caddr_t)&h, FREAD, proc0.p_ucred) != 0)
120 return 0;
121
122 for (i = h.ending_track; i >= 0; i--) {
123 t.address_format = CD_LBA_FORMAT;
124 t.track = i;
125 if (dev_dioctl(dev, CDIOREADTOCENTRY, (caddr_t)&t, FREAD, proc0.p_ucred) != 0) {
126 return 0;
127 }
128 if ((t.entry.control & 4) != 0)
129 /* found a data track */
130 break;
131 }
132
133 if (i < 0)
134 return 0;
135
136 return ntohl(t.entry.addr.lba);
137 }
138
139 static int
140 iso_mountroot(struct mount *mp)
141 {
142 struct iso_args args;
143 struct vnode *rootvp;
144 int error;
145
146 if ((error = bdevvp(rootdev, &rootvp))) {
147 kprintf("iso_mountroot: can't find rootvp\n");
148 return (error);
149 }
150 args.flags = ISOFSMNT_ROOT;
151
152 vn_lock(rootvp, LK_EXCLUSIVE | LK_RETRY);
153 error = VOP_OPEN(rootvp, FREAD, FSCRED, NULL);
154 vn_unlock(rootvp);
155 if (error)
156 return (error);
157
158 args.ssector = iso_get_ssector(rootdev);
159
160 VOP_CLOSE(rootvp, FREAD);
161
162 if (bootverbose)
163 kprintf("iso_mountroot(): using session at block %d\n",
164 args.ssector);
165 if ((error = iso_mountfs(rootvp, mp, &args)) != 0)
166 return (error);
167
168 cd9660_statfs(mp, &mp->mnt_stat, proc0.p_ucred);
169 return (0);
170 }
171
172 /*
173 * VFS Operations.
174 *
175 * mount system call
176 */
177 static int
178 cd9660_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
179 {
180 struct vnode *devvp;
181 struct iso_args args;
182 size_t size;
183 int error;
184 mode_t accessmode;
185 struct iso_mnt *imp = 0;
186 struct nlookupdata nd;
187
188 if ((mp->mnt_flag & (MNT_ROOTFS|MNT_UPDATE)) == MNT_ROOTFS) {
189 return (iso_mountroot(mp));
190 }
191 if ((error = copyin(data, (caddr_t)&args, sizeof (struct iso_args))))
192 return (error);
193
194 if ((mp->mnt_flag & MNT_RDONLY) == 0)
195 return (EROFS);
196
197 /*
198 * If updating, check whether changing from read-only to
199 * read/write; if there is no device name, that's all we do.
200 */
201 if (mp->mnt_flag & MNT_UPDATE) {
202 imp = VFSTOISOFS(mp);
203 if (args.fspec == 0)
204 return (vfs_export(mp, &imp->im_export, &args.export));
205 }
206 /*
207 * Not an update, or updating the name: look up the name
208 * and verify that it refers to a sensible block device.
209 */
210 devvp = NULL;
211 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW);
212 if (error == 0)
213 error = nlookup(&nd);
214 if (error == 0)
215 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
216 nlookup_done(&nd);
217 if (error)
218 return (error);
219
220 if (!vn_isdisk(devvp, &error)) {
221 vrele(devvp);
222 return (error);
223 }
224
225 /*
226 * Verify that user has necessary permissions on the device,
227 * or has superuser abilities
228 */
229 accessmode = VREAD;
230 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
231 error = VOP_ACCESS(devvp, accessmode, cred);
232 if (error)
233 error = suser_cred(cred, 0);
234 if (error) {
235 vput(devvp);
236 return (error);
237 }
238 vn_unlock(devvp);
239
240 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
241 error = iso_mountfs(devvp, mp, &args);
242 } else {
243 if (devvp != imp->im_devvp)
244 error = EINVAL; /* needs translation */
245 else
246 vrele(devvp);
247 }
248 if (error) {
249 vrele(devvp);
250 return error;
251 }
252 imp = VFSTOISOFS(mp);
253 copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
254 &size);
255 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
256 cd9660_statfs(mp, &mp->mnt_stat, cred);
257 return 0;
258 }
259
260 /*
261 * Common code for mount and mountroot
262 */
263 static int
264 iso_mountfs(struct vnode *devvp, struct mount *mp, struct iso_args *argp)
265 {
266 struct iso_mnt *isomp = NULL;
267 struct buf *bp = NULL;
268 struct buf *pribp = NULL, *supbp = NULL;
269 cdev_t dev;
270 int error = EINVAL;
271 int needclose = 0;
272 int high_sierra = 0;
273 int iso_bsize;
274 int iso_blknum;
275 int joliet_level;
276 struct iso_volume_descriptor *vdp = 0;
277 struct iso_primary_descriptor *pri = NULL;
278 struct iso_sierra_primary_descriptor *pri_sierra = NULL;
279 struct iso_supplementary_descriptor *sup = NULL;
280 struct iso_directory_record *rootp;
281 int logical_block_size;
282
283 if (!(mp->mnt_flag & MNT_RDONLY))
284 return EROFS;
285
286 /*
287 * Disallow multiple mounts of the same device.
288 * Disallow mounting of a device that is currently in use
289 * Flush out any old buffers remaining from a previous use.
290 */
291 if ((error = vfs_mountedon(devvp)))
292 return error;
293 if (count_udev(devvp->v_umajor, devvp->v_uminor) > 0)
294 return EBUSY;
295 if ((error = vinvalbuf(devvp, V_SAVE, 0, 0)))
296 return (error);
297
298 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
299 error = VOP_OPEN(devvp, FREAD, FSCRED, NULL);
300 vn_unlock(devvp);
301 if (error)
302 return error;
303 dev = devvp->v_rdev;
304 if (dev->si_iosize_max != 0)
305 mp->mnt_iosize_max = dev->si_iosize_max;
306 if (mp->mnt_iosize_max > MAXPHYS)
307 mp->mnt_iosize_max = MAXPHYS;
308
309 needclose = 1;
310
311 /* This is the "logical sector size". The standard says this
312 * should be 2048 or the physical sector size on the device,
313 * whichever is greater. For now, we'll just use a constant.
314 */
315 iso_bsize = ISO_DEFAULT_BLOCK_SIZE;
316
317 joliet_level = 0;
318 for (iso_blknum = 16 + argp->ssector;
319 iso_blknum < 100 + argp->ssector;
320 iso_blknum++) {
321 if ((error = bread(devvp, (off_t)iso_blknum * iso_bsize,
322 iso_bsize, &bp)) != 0)
323 goto out;
324
325 vdp = (struct iso_volume_descriptor *)bp->b_data;
326 if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) {
327 if (bcmp (vdp->id_sierra, ISO_SIERRA_ID,
328 sizeof vdp->id) != 0) {
329 error = EINVAL;
330 goto out;
331 } else
332 high_sierra = 1;
333 }
334 switch (isonum_711 (high_sierra? vdp->type_sierra: vdp->type)){
335 case ISO_VD_PRIMARY:
336 if (pribp == NULL) {
337 pribp = bp;
338 bp = NULL;
339 pri = (struct iso_primary_descriptor *)vdp;
340 pri_sierra =
341 (struct iso_sierra_primary_descriptor *)vdp;
342 }
343 break;
344
345 case ISO_VD_SUPPLEMENTARY:
346 if (supbp == NULL) {
347 supbp = bp;
348 bp = NULL;
349 sup = (struct iso_supplementary_descriptor *)vdp;
350
351 if (!(argp->flags & ISOFSMNT_NOJOLIET)) {
352 if (bcmp(sup->escape, "%/@", 3) == 0)
353 joliet_level = 1;
354 if (bcmp(sup->escape, "%/C", 3) == 0)
355 joliet_level = 2;
356 if (bcmp(sup->escape, "%/E", 3) == 0)
357 joliet_level = 3;
358
359 if ((isonum_711 (sup->flags) & 1) &&
360 (argp->flags & ISOFSMNT_BROKENJOLIET) == 0)
361 joliet_level = 0;
362 }
363 }
364 break;
365
366 case ISO_VD_END:
367 goto vd_end;
368
369 default:
370 break;
371 }
372 if (bp) {
373 brelse(bp);
374 bp = NULL;
375 }
376 }
377 vd_end:
378 if (bp) {
379 brelse(bp);
380 bp = NULL;
381 }
382
383 if (pri == NULL) {
384 error = EINVAL;
385 goto out;
386 }
387
388 logical_block_size =
389 isonum_723 (high_sierra?
390 pri_sierra->logical_block_size:
391 pri->logical_block_size);
392
393 if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE
394 || (logical_block_size & (logical_block_size - 1)) != 0) {
395 error = EINVAL;
396 goto out;
397 }
398
399 rootp = (struct iso_directory_record *)
400 (high_sierra?
401 pri_sierra->root_directory_record:
402 pri->root_directory_record);
403
404 isomp = kmalloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO);
405 isomp->logical_block_size = logical_block_size;
406 isomp->volume_space_size =
407 isonum_733 (high_sierra?
408 pri_sierra->volume_space_size:
409 pri->volume_space_size);
410 isomp->joliet_level = 0;
411 /*
412 * Since an ISO9660 multi-session CD can also access previous
413 * sessions, we have to include them into the space consider-
414 * ations. This doesn't yield a very accurate number since
415 * parts of the old sessions might be inaccessible now, but we
416 * can't do much better. This is also important for the NFS
417 * filehandle validation.
418 */
419 isomp->volume_space_size += argp->ssector;
420 bcopy (rootp, isomp->root, sizeof isomp->root);
421 isomp->root_extent = isonum_733 (rootp->extent);
422 isomp->root_size = isonum_733 (rootp->size);
423
424 isomp->im_bmask = logical_block_size - 1;
425 isomp->im_bshift = ffs(logical_block_size) - 1;
426
427 pribp->b_flags |= B_AGE;
428 brelse(pribp);
429 pribp = NULL;
430
431 mp->mnt_data = (qaddr_t)isomp;
432 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
433 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
434 mp->mnt_maxsymlinklen = 0;
435 mp->mnt_flag |= MNT_LOCAL;
436 isomp->im_mountp = mp;
437 isomp->im_dev = dev;
438 isomp->im_devvp = devvp;
439
440 dev->si_mountpoint = mp;
441
442 /* Check the Rock Ridge Extention support */
443 if (!(argp->flags & ISOFSMNT_NORRIP)) {
444 if ((error = bread(isomp->im_devvp,
445 lblktooff(isomp, isomp->root_extent + isonum_711(rootp->ext_attr_length)),
446 isomp->logical_block_size, &bp)) != 0)
447 goto out;
448
449 rootp = (struct iso_directory_record *)bp->b_data;
450
451 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) {
452 argp->flags |= ISOFSMNT_NORRIP;
453 } else {
454 argp->flags &= ~ISOFSMNT_GENS;
455 }
456
457 /*
458 * The contents are valid,
459 * but they will get reread as part of another vnode, so...
460 */
461 bp->b_flags |= B_AGE;
462 brelse(bp);
463 bp = NULL;
464 }
465 isomp->im_flags = argp->flags & (ISOFSMNT_NORRIP | ISOFSMNT_GENS |
466 ISOFSMNT_EXTATT | ISOFSMNT_NOJOLIET);
467
468 if (high_sierra) {
469 /* this effectively ignores all the mount flags */
470 log(LOG_INFO, "cd9660: High Sierra Format\n");
471 isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA;
472 } else {
473 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) {
474 default:
475 isomp->iso_ftype = ISO_FTYPE_DEFAULT;
476 break;
477 case ISOFSMNT_GENS|ISOFSMNT_NORRIP:
478 isomp->iso_ftype = ISO_FTYPE_9660;
479 break;
480 case 0:
481 log(LOG_INFO, "cd9660: RockRidge Extension\n");
482 isomp->iso_ftype = ISO_FTYPE_RRIP;
483 break;
484 }
485 }
486
487 /* Decide whether to use the Joliet descriptor */
488
489 if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) {
490 log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n", joliet_level);
491 rootp = (struct iso_directory_record *)
492 sup->root_directory_record;
493 bcopy (rootp, isomp->root, sizeof isomp->root);
494 isomp->root_extent = isonum_733 (rootp->extent);
495 isomp->root_size = isonum_733 (rootp->size);
496 isomp->joliet_level = joliet_level;
497 supbp->b_flags |= B_AGE;
498 }
499
500 if (supbp) {
501 brelse(supbp);
502 supbp = NULL;
503 }
504
505 vfs_add_vnodeops(mp, &cd9660_vnode_vops, &mp->mnt_vn_norm_ops);
506 vfs_add_vnodeops(mp, &cd9660_spec_vops, &mp->mnt_vn_spec_ops);
507 vfs_add_vnodeops(mp, &cd9660_fifo_vops, &mp->mnt_vn_fifo_ops);
508
509 return 0;
510 out:
511 dev->si_mountpoint = NULL;
512 if (bp)
513 brelse(bp);
514 if (pribp)
515 brelse(pribp);
516 if (supbp)
517 brelse(supbp);
518 if (needclose)
519 VOP_CLOSE(devvp, FREAD);
520 if (isomp) {
521 kfree((caddr_t)isomp, M_ISOFSMNT);
522 mp->mnt_data = (qaddr_t)0;
523 }
524 return error;
525 }
526
527 /*
528 * unmount system call
529 */
530 static int
531 cd9660_unmount(struct mount *mp, int mntflags)
532 {
533 struct iso_mnt *isomp;
534 int error, flags = 0;
535
536 if (mntflags & MNT_FORCE)
537 flags |= FORCECLOSE;
538 #if 0
539 mntflushbuf(mp, 0);
540 if (mntinvalbuf(mp))
541 return EBUSY;
542 #endif
543 if ((error = vflush(mp, 0, flags)))
544 return (error);
545
546 isomp = VFSTOISOFS(mp);
547
548 isomp->im_devvp->v_rdev->si_mountpoint = NULL;
549 error = VOP_CLOSE(isomp->im_devvp, FREAD);
550 vrele(isomp->im_devvp);
551 kfree((caddr_t)isomp, M_ISOFSMNT);
552 mp->mnt_data = (qaddr_t)0;
553 mp->mnt_flag &= ~MNT_LOCAL;
554 return (error);
555 }
556
557 /*
558 * Return root of a filesystem
559 */
560 static int
561 cd9660_root(struct mount *mp, struct vnode **vpp)
562 {
563 struct iso_mnt *imp = VFSTOISOFS(mp);
564 struct iso_directory_record *dp =
565 (struct iso_directory_record *)imp->root;
566 ino_t ino = isodirino(dp, imp);
567
568 /*
569 * With RRIP we must use the `.' entry of the root directory.
570 * Simply tell vget, that it's a relocated directory.
571 */
572 return (cd9660_vget_internal(mp, ino, vpp,
573 imp->iso_ftype == ISO_FTYPE_RRIP, dp));
574 }
575
576 /*
577 * Get file system statistics.
578 */
579 int
580 cd9660_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
581 {
582 struct iso_mnt *isomp;
583
584 isomp = VFSTOISOFS(mp);
585
586 sbp->f_bsize = isomp->logical_block_size;
587 sbp->f_iosize = sbp->f_bsize; /* XXX */
588 sbp->f_blocks = isomp->volume_space_size;
589 sbp->f_bfree = 0; /* total free blocks */
590 sbp->f_bavail = 0; /* blocks free for non superuser */
591 sbp->f_files = 0; /* total files */
592 sbp->f_ffree = 0; /* free file nodes */
593 if (sbp != &mp->mnt_stat) {
594 sbp->f_type = mp->mnt_vfc->vfc_typenum;
595 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
596 }
597 return 0;
598 }
599
600 /*
601 * File handle to vnode
602 *
603 * Have to be really careful about stale file handles:
604 * - check that the inode number is in range
605 * - call iget() to get the locked inode
606 * - check for an unallocated inode (i_mode == 0)
607 * - check that the generation number matches
608 */
609
610 struct ifid {
611 ushort ifid_len;
612 ushort ifid_pad;
613 int ifid_ino;
614 long ifid_start;
615 };
616
617 /* ARGSUSED */
618 int
619 cd9660_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
620 {
621 struct ifid *ifhp = (struct ifid *)fhp;
622 struct iso_node *ip;
623 struct vnode *nvp;
624 int error;
625
626 #ifdef ISOFS_DBG
627 kprintf("fhtovp: ino %d, start %ld\n",
628 ifhp->ifid_ino, ifhp->ifid_start);
629 #endif
630
631 if ((error = VFS_VGET(mp, ifhp->ifid_ino, &nvp)) != 0) {
632 *vpp = NULLVP;
633 return (error);
634 }
635 ip = VTOI(nvp);
636 if (ip->inode.iso_mode == 0) {
637 vput(nvp);
638 *vpp = NULLVP;
639 return (ESTALE);
640 }
641 *vpp = nvp;
642 return (0);
643 }
644
645 int
646 cd9660_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp,
647 struct ucred **credanonp)
648 {
649 struct netcred *np;
650 struct iso_mnt *imp;
651
652 imp = VFSTOISOFS(mp);
653
654 /*
655 * Get the export permission structure for this <mp, client> tuple.
656 */
657 np = vfs_export_lookup(mp, &imp->im_export, nam);
658 if (np == NULL)
659 return (EACCES);
660
661 *exflagsp = np->netc_exflags;
662 *credanonp = &np->netc_anon;
663 return (0);
664 }
665
666 int
667 cd9660_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
668 {
669
670 /*
671 * XXXX
672 * It would be nice if we didn't always set the `relocated' flag
673 * and force the extra read, but I don't want to think about fixing
674 * that right now.
675 */
676 return (cd9660_vget_internal(mp, ino, vpp,
677 #if 0
678 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP,
679 #else
680 0,
681 #endif
682 (struct iso_directory_record *)0));
683 }
684
685 int
686 cd9660_vget_internal(struct mount *mp, ino_t ino, struct vnode **vpp,
687 int relocated, struct iso_directory_record *isodir)
688 {
689 struct iso_mnt *imp;
690 struct iso_node *ip;
691 struct buf *bp;
692 struct vnode *vp;
693 cdev_t dev;
694 int error;
695
696 imp = VFSTOISOFS(mp);
697 dev = imp->im_dev;
698 again:
699 if ((*vpp = cd9660_ihashget(dev, ino)) != NULLVP)
700 return (0);
701
702 /* Allocate a new vnode/iso_node. */
703 error = getnewvnode(VT_ISOFS, mp, &vp, 0, 0);
704 if (error) {
705 *vpp = NULLVP;
706 return (error);
707 }
708 MALLOC(ip, struct iso_node *, sizeof(struct iso_node), M_ISOFSNODE,
709 M_WAITOK | M_ZERO);
710 ip->i_vnode = vp;
711 ip->i_dev = dev;
712 ip->i_number = ino;
713
714 /*
715 * Insert it into the inode hash table and check for a collision.
716 * If a collision occurs, throw away the vnode and try again.
717 */
718 if (cd9660_ihashins(ip) != 0) {
719 kprintf("debug: cd9660 ihashins collision, retrying\n");
720 vx_put(vp);
721 kfree(ip, M_ISOFSNODE);
722 goto again;
723 }
724 vp->v_data = ip;
725
726 if (isodir == NULL) {
727 int lbn, off;
728
729 lbn = lblkno(imp, ino);
730 if (lbn >= imp->volume_space_size) {
731 vx_put(vp);
732 kprintf("fhtovp: lbn exceed volume space %d\n", lbn);
733 return (ESTALE);
734 }
735
736 off = blkoff(imp, ino);
737 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) {
738 vx_put(vp);
739 kprintf("fhtovp: crosses block boundary %d\n",
740 off + ISO_DIRECTORY_RECORD_SIZE);
741 return (ESTALE);
742 }
743
744 error = bread(imp->im_devvp,
745 lblktooff(imp, lbn),
746 imp->logical_block_size, &bp);
747 if (error) {
748 vx_put(vp);
749 brelse(bp);
750 kprintf("fhtovp: bread error %d\n",error);
751 return (error);
752 }
753 isodir = (struct iso_directory_record *)(bp->b_data + off);
754
755 if (off + isonum_711(isodir->length) >
756 imp->logical_block_size) {
757 vx_put(vp);
758 if (bp != NULL)
759 brelse(bp);
760 kprintf("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 if (bp != NULL)
770 brelse(bp);
771 kprintf("fhtovp: file start miss %d vs %d\n",
772 isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length),
773 ifhp->ifid_start);
774 return (ESTALE);
775 }
776 #endif
777 } else
778 bp = 0;
779
780 ip->i_mnt = imp;
781 ip->i_devvp = imp->im_devvp;
782 vref(ip->i_devvp);
783
784 if (relocated) {
785 /*
786 * On relocated directories we must
787 * read the `.' entry out of a dir.
788 */
789 ip->iso_start = ino >> imp->im_bshift;
790 if (bp != NULL)
791 brelse(bp);
792 if ((error = cd9660_devblkatoff(vp, (off_t)0, NULL, &bp)) != 0) {
793 vx_put(vp);
794 return (error);
795 }
796 isodir = (struct iso_directory_record *)bp->b_data;
797 }
798
799 ip->iso_extent = isonum_733(isodir->extent);
800 ip->i_size = isonum_733(isodir->size);
801 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent;
802
803 /*
804 * Setup time stamp, attribute
805 */
806 vp->v_type = VNON;
807 switch (imp->iso_ftype) {
808 default: /* ISO_FTYPE_9660 */
809 {
810 struct buf *bp2;
811 int off;
812 if ((imp->im_flags & ISOFSMNT_EXTATT)
813 && (off = isonum_711(isodir->ext_attr_length)))
814 cd9660_devblkatoff(vp, (off_t)-(off << imp->im_bshift), NULL,
815 &bp2);
816 else
817 bp2 = NULL;
818 cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660);
819 cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660);
820 if (bp2)
821 brelse(bp2);
822 break;
823 }
824 case ISO_FTYPE_RRIP:
825 cd9660_rrip_analyze(isodir, ip, imp);
826 break;
827 }
828
829 if (bp != NULL)
830 brelse(bp);
831
832 /*
833 * Initialize the associated vnode
834 */
835 vp->v_type = IFTOVT(ip->inode.iso_mode);
836
837 switch (vp->v_type) {
838 case VFIFO:
839 vp->v_ops = &mp->mnt_vn_fifo_ops;
840 break;
841 case VCHR:
842 case VBLK:
843 vp->v_ops = &mp->mnt_vn_spec_ops;
844 addaliasu(vp, umajor(ip->inode.iso_rdev),
845 uminor(ip->inode.iso_rdev));
846 break;
847 case VREG:
848 case VDIR:
849 vinitvmio(vp, ip->i_size);
850 break;
851 default:
852 break;
853 }
854
855 if (ip->iso_extent == imp->root_extent)
856 vp->v_flag |= VROOT;
857
858 /*
859 * Return the locked and refd vp
860 */
861 *vpp = vp;
862 return (0);
863 }
864
865 /*
866 * Vnode pointer to File handle
867 */
868 /* ARGSUSED */
869 int
870 cd9660_vptofh(struct vnode *vp, struct fid *fhp)
871 {
872 struct iso_node *ip = VTOI(vp);
873 struct ifid *ifhp;
874
875 ifhp = (struct ifid *)fhp;
876 ifhp->ifid_len = sizeof(struct ifid);
877
878 ifhp->ifid_ino = ip->i_number;
879 ifhp->ifid_start = ip->iso_start;
880
881 #ifdef ISOFS_DBG
882 kprintf("vptofh: ino %d, start %ld\n",
883 ifhp->ifid_ino,ifhp->ifid_start);
884 #endif
885 return 0;
886 }
DragonFly BSD