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. 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 * $FreeBSD: src/sys/isofs/cd9660/cd9660_vfsops.c,v 1.74.2.7 2002/04/08 09:39:29 bde Exp $
36 */
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/proc.h>
41 #include <sys/caps.h>
42 #include <sys/nlookup.h>
43 #include <sys/kernel.h>
44 #include <sys/vnode.h>
45 #include <sys/mount.h>
46 #include <sys/buf.h>
47 #include <sys/cdio.h>
48 #include <sys/conf.h>
49 #include <sys/fcntl.h>
50 #include <sys/malloc.h>
51 #include <sys/stat.h>
52 #include <sys/syslog.h>
53 #include <sys/iconv.h>
54
55 #include <vm/vm_zone.h>
56
57 #include <sys/buf2.h>
58
59 #include "iso.h"
60 #include "iso_rrip.h"
61 #include "cd9660_node.h"
62 #include "cd9660_mount.h"
63
64 extern struct vop_ops cd9660_vnode_vops;
65 extern struct vop_ops cd9660_spec_vops;
66 extern struct vop_ops cd9660_fifo_vops;
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 int cd9660_mount(struct mount *, char *, caddr_t, struct ucred *);
74 static int cd9660_unmount(struct mount *, int);
75 static int cd9660_root(struct mount *, struct vnode **);
76 static int cd9660_statfs(struct mount *, struct statfs *, struct ucred *);
77 static int cd9660_vget(struct mount *, struct vnode *, ino_t, struct vnode **);
78 static int cd9660_fhtovp(struct mount *, struct vnode *rootvp,
79 struct fid *, struct vnode **);
80 static int cd9660_checkexp(struct mount *, struct sockaddr *,
81 int *, struct ucred **);
82 static int cd9660_vptofh (struct vnode *, struct fid *);
83
84 static struct vfsops cd9660_vfsops = {
85 .vfs_flags = 0,
86 .vfs_mount = cd9660_mount,
87 .vfs_unmount = cd9660_unmount,
88 .vfs_root = cd9660_root,
89 .vfs_statfs = cd9660_statfs,
90 .vfs_vget = cd9660_vget,
91 .vfs_fhtovp = cd9660_fhtovp,
92 .vfs_checkexp = cd9660_checkexp,
93 .vfs_vptofh = cd9660_vptofh,
94 .vfs_init = cd9660_init,
95 .vfs_uninit = cd9660_uninit,
96 };
97 VFS_SET(cd9660_vfsops, cd9660, VFCF_READONLY);
98 MODULE_VERSION(cd9660, 1);
99
100
101 /*
102 * Called by vfs_mountroot when iso is going to be mounted as root.
103 */
104
105 static int iso_get_ssector(cdev_t dev);
106 static int iso_mountfs(struct vnode *devvp, struct mount *mp,
107 struct iso_args *argp);
108
109 /*
110 * Try to find the start of the last data track on this CD-ROM. This
111 * is used to mount the last session of a multi-session CD. Bail out
112 * and return 0 if we fail, this is always a safe bet.
113 */
114 static int
iso_get_ssector(cdev_t dev)115 iso_get_ssector(cdev_t dev)
116 {
117 struct ioc_toc_header h;
118 struct ioc_read_toc_single_entry t;
119 int i;
120
121 if (dev_dioctl(dev, CDIOREADTOCHEADER, (caddr_t)&h, FREAD,
122 proc0.p_ucred, NULL, NULL) != 0)
123 return 0;
124
125 for (i = h.ending_track; i >= 0; i--) {
126 t.address_format = CD_LBA_FORMAT;
127 t.track = i;
128 if (dev_dioctl(dev, CDIOREADTOCENTRY, (caddr_t)&t, FREAD,
129 proc0.p_ucred, NULL, NULL) != 0) {
130 return 0;
131 }
132 if ((t.entry.control & 4) != 0)
133 /* found a data track */
134 break;
135 }
136
137 if (i < 0)
138 return 0;
139
140 return ntohl(t.entry.addr.lba);
141 }
142
143 static int
iso_mountroot(struct mount * mp)144 iso_mountroot(struct mount *mp)
145 {
146 struct iso_args args;
147 struct vnode *rootvp;
148 int error;
149
150 if ((error = bdevvp(rootdev, &rootvp))) {
151 kprintf("iso_mountroot: can't find rootvp\n");
152 return (error);
153 }
154 args.flags = ISOFSMNT_ROOT;
155
156 vn_lock(rootvp, LK_EXCLUSIVE | LK_RETRY);
157 error = VOP_OPEN(rootvp, FREAD, FSCRED, NULL);
158 vn_unlock(rootvp);
159 if (error)
160 return (error);
161
162 args.ssector = iso_get_ssector(rootdev);
163
164 vn_lock(rootvp, LK_EXCLUSIVE | LK_RETRY);
165 VOP_CLOSE(rootvp, FREAD, NULL);
166 vn_unlock(rootvp);
167
168 if (bootverbose)
169 kprintf("iso_mountroot(): using session at block %d\n",
170 args.ssector);
171 if ((error = iso_mountfs(rootvp, mp, &args)) != 0)
172 return (error);
173
174 cd9660_statfs(mp, &mp->mnt_stat, proc0.p_ucred);
175 return (0);
176 }
177
178 /*
179 * VFS Operations.
180 *
181 * mount system call
182 */
183 static int
cd9660_mount(struct mount * mp,char * path,caddr_t data,struct ucred * cred)184 cd9660_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
185 {
186 struct vnode *devvp;
187 struct iso_args args;
188 size_t size;
189 int error;
190 mode_t accessmode;
191 struct iso_mnt *imp = NULL;
192 struct nlookupdata nd;
193
194 if ((mp->mnt_flag & (MNT_ROOTFS|MNT_UPDATE)) == MNT_ROOTFS) {
195 return (iso_mountroot(mp));
196 }
197 if ((error = copyin(data, (caddr_t)&args, sizeof (struct iso_args))))
198 return (error);
199
200 if ((mp->mnt_flag & MNT_RDONLY) == 0)
201 return (EROFS);
202
203 /*
204 * If updating, check whether changing from read-only to
205 * read/write; if there is no device name, that's all we do.
206 */
207 if (mp->mnt_flag & MNT_UPDATE) {
208 imp = VFSTOISOFS(mp);
209 if (args.fspec == NULL)
210 return (vfs_export(mp, &imp->im_export, &args.export));
211 }
212 /*
213 * Not an update, or updating the name: look up the name
214 * and verify that it refers to a sensible block device.
215 */
216 devvp = NULL;
217 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW);
218 if (error == 0)
219 error = nlookup(&nd);
220 if (error == 0)
221 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
222 nlookup_done(&nd);
223 if (error)
224 return (error);
225
226 if (!vn_isdisk(devvp, &error)) {
227 vrele(devvp);
228 return (error);
229 }
230
231 /*
232 * Verify that user has necessary permissions on the device,
233 * or has superuser abilities
234 */
235 accessmode = VREAD;
236 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
237 error = VOP_EACCESS(devvp, accessmode, cred);
238 if (error)
239 error = caps_priv_check(cred, SYSCAP_RESTRICTEDROOT);
240 if (error) {
241 vput(devvp);
242 return (error);
243 }
244 vn_unlock(devvp);
245
246 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
247 error = iso_mountfs(devvp, mp, &args);
248 } else {
249 if (devvp != imp->im_devvp)
250 error = EINVAL; /* needs translation */
251 else
252 vrele(devvp);
253 }
254 if (error) {
255 vrele(devvp);
256 return error;
257 }
258 imp = VFSTOISOFS(mp);
259 copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
260 &size);
261 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
262 cd9660_statfs(mp, &mp->mnt_stat, cred);
263 return 0;
264 }
265
266 /*
267 * Common code for mount and mountroot
268 */
269 static int
iso_mountfs(struct vnode * devvp,struct mount * mp,struct iso_args * argp)270 iso_mountfs(struct vnode *devvp, struct mount *mp, struct iso_args *argp)
271 {
272 struct iso_mnt *isomp = NULL;
273 struct buf *bp = NULL;
274 struct buf *pribp = NULL, *supbp = NULL;
275 cdev_t dev;
276 int error = EINVAL;
277 int needclose = 0;
278 int high_sierra = 0;
279 int iso_bsize;
280 int iso_blknum;
281 int joliet_level;
282 struct iso_volume_descriptor *vdp = NULL;
283 struct iso_primary_descriptor *pri = NULL;
284 struct iso_sierra_primary_descriptor *pri_sierra = NULL;
285 struct iso_supplementary_descriptor *sup = NULL;
286 struct iso_directory_record *rootp;
287 int logical_block_size;
288 char cs_local[ICONV_CSNMAXLEN];
289 char cs_disk[ICONV_CSNMAXLEN];
290
291 if (!(mp->mnt_flag & MNT_RDONLY))
292 return EROFS;
293
294 /*
295 * Disallow multiple mounts of the same device.
296 * Disallow mounting of a device that is currently in use
297 * Flush out any old buffers remaining from a previous use.
298 */
299 if ((error = vfs_mountedon(devvp)))
300 return error;
301 if (vcount(devvp) > 0)
302 return EBUSY;
303 if ((error = vinvalbuf(devvp, V_SAVE, 0, 0)))
304 return (error);
305
306 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
307 error = VOP_OPEN(devvp, FREAD, FSCRED, NULL);
308 vn_unlock(devvp);
309 if (error)
310 return error;
311 dev = devvp->v_rdev;
312 if (dev->si_iosize_max != 0)
313 mp->mnt_iosize_max = dev->si_iosize_max;
314 if (mp->mnt_iosize_max > MAXPHYS)
315 mp->mnt_iosize_max = MAXPHYS;
316
317 needclose = 1;
318
319 /* This is the "logical sector size". The standard says this
320 * should be 2048 or the physical sector size on the device,
321 * whichever is greater. For now, we'll just use a constant.
322 */
323 iso_bsize = ISO_DEFAULT_BLOCK_SIZE;
324
325 joliet_level = 0;
326 for (iso_blknum = 16 + argp->ssector;
327 iso_blknum < 100 + argp->ssector;
328 iso_blknum++) {
329 if ((error = bread(devvp, (off_t)iso_blknum * iso_bsize,
330 iso_bsize, &bp)) != 0)
331 goto out;
332
333 vdp = (struct iso_volume_descriptor *)bp->b_data;
334 if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) {
335 if (bcmp (vdp->id_sierra, ISO_SIERRA_ID,
336 sizeof vdp->id) != 0) {
337 error = EINVAL;
338 goto out;
339 } else
340 high_sierra = 1;
341 }
342 switch (isonum_711 (high_sierra? vdp->type_sierra: vdp->type)){
343 case ISO_VD_PRIMARY:
344 if (pribp == NULL) {
345 pribp = bp;
346 bp = NULL;
347 pri = (struct iso_primary_descriptor *)vdp;
348 pri_sierra =
349 (struct iso_sierra_primary_descriptor *)vdp;
350 }
351 break;
352
353 case ISO_VD_SUPPLEMENTARY:
354 if (supbp == NULL) {
355 supbp = bp;
356 bp = NULL;
357 sup = (struct iso_supplementary_descriptor *)vdp;
358
359 if (!(argp->flags & ISOFSMNT_NOJOLIET)) {
360 if (bcmp(sup->escape, "%/@", 3) == 0)
361 joliet_level = 1;
362 if (bcmp(sup->escape, "%/C", 3) == 0)
363 joliet_level = 2;
364 if (bcmp(sup->escape, "%/E", 3) == 0)
365 joliet_level = 3;
366
367 if ((isonum_711 (sup->flags) & 1) &&
368 (argp->flags & ISOFSMNT_BROKENJOLIET) == 0)
369 joliet_level = 0;
370 }
371 }
372 break;
373
374 case ISO_VD_END:
375 goto vd_end;
376
377 default:
378 break;
379 }
380 if (bp) {
381 brelse(bp);
382 bp = NULL;
383 }
384 }
385 vd_end:
386 if (bp) {
387 brelse(bp);
388 bp = NULL;
389 }
390
391 if (pri == NULL) {
392 error = EINVAL;
393 goto out;
394 }
395
396 logical_block_size =
397 isonum_723 (high_sierra?
398 pri_sierra->logical_block_size:
399 pri->logical_block_size);
400
401 if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE
402 || (logical_block_size & (logical_block_size - 1)) != 0) {
403 error = EINVAL;
404 goto out;
405 }
406
407 rootp = (struct iso_directory_record *)
408 (high_sierra?
409 pri_sierra->root_directory_record:
410 pri->root_directory_record);
411
412 isomp = kmalloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO);
413 isomp->logical_block_size = logical_block_size;
414 isomp->volume_space_size =
415 isonum_733 (high_sierra?
416 pri_sierra->volume_space_size:
417 pri->volume_space_size);
418 isomp->joliet_level = 0;
419 /*
420 * Since an ISO9660 multi-session CD can also access previous
421 * sessions, we have to include them into the space consider-
422 * ations. This doesn't yield a very accurate number since
423 * parts of the old sessions might be inaccessible now, but we
424 * can't do much better. This is also important for the NFS
425 * filehandle validation.
426 */
427 isomp->volume_space_size += argp->ssector;
428 bcopy (rootp, isomp->root, sizeof isomp->root);
429 isomp->root_extent = isonum_733 (rootp->extent);
430 isomp->root_size = isonum_733 (rootp->size);
431
432 isomp->im_bmask = logical_block_size - 1;
433 isomp->im_bshift = ffs(logical_block_size) - 1;
434
435 pribp->b_flags |= B_AGE;
436 brelse(pribp);
437 pribp = NULL;
438
439 mp->mnt_data = (qaddr_t)isomp;
440 mp->mnt_stat.f_fsid.val[0] = devid_from_dev(dev);
441 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
442 mp->mnt_maxsymlinklen = 0;
443 mp->mnt_flag |= MNT_LOCAL;
444 isomp->im_mountp = mp;
445 isomp->im_dev = dev;
446 isomp->im_devvp = devvp;
447
448 dev->si_mountpoint = mp;
449
450 if (argp->flags & ISOFSMNT_UID)
451 isomp->im_uid = argp->uid;
452 if (argp->flags & ISOFSMNT_GID)
453 isomp->im_gid = argp->gid;
454 if (argp->flags & ISOFSMNT_MODEMASK) {
455 isomp->im_fmask = argp->fmask & ACCESSPERMS;
456 isomp->im_dmask = argp->dmask & ACCESSPERMS;
457 } else {
458 isomp->im_fmask = ACCESSPERMS;
459 isomp->im_dmask = ACCESSPERMS;
460 }
461
462 /* Check the Rock Ridge Extension support */
463 if (!(argp->flags & ISOFSMNT_NORRIP)) {
464 if ((error = bread(isomp->im_devvp,
465 lblktooff(isomp, isomp->root_extent + isonum_711(rootp->ext_attr_length)),
466 isomp->logical_block_size, &bp)) != 0)
467 goto out;
468
469 rootp = (struct iso_directory_record *)bp->b_data;
470
471 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) {
472 argp->flags |= ISOFSMNT_NORRIP;
473 } else {
474 argp->flags &= ~ISOFSMNT_GENS;
475 }
476
477 /*
478 * The contents are valid,
479 * but they will get reread as part of another vnode, so...
480 */
481 bp->b_flags |= B_AGE;
482 brelse(bp);
483 bp = NULL;
484 }
485 isomp->im_flags = argp->flags & (ISOFSMNT_NORRIP | ISOFSMNT_GENS |
486 ISOFSMNT_EXTATT | ISOFSMNT_NOJOLIET |
487 ISOFSMNT_KICONV |
488 ISOFSMNT_UID | ISOFSMNT_GID);
489
490 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) {
491 bcopy(argp->cs_local, cs_local, sizeof(cs_local));
492 bcopy(argp->cs_disk, cs_disk, sizeof(cs_disk));
493 cd9660_iconv->open(cs_local, cs_disk, &isomp->im_d2l);
494 cd9660_iconv->open(cs_disk, cs_local, &isomp->im_l2d);
495 } else {
496 isomp->im_d2l = NULL;
497 isomp->im_l2d = NULL;
498 }
499
500 if (high_sierra) {
501 /* this effectively ignores all the mount flags */
502 log(LOG_INFO, "cd9660: High Sierra Format\n");
503 isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA;
504 } else {
505 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) {
506 default:
507 isomp->iso_ftype = ISO_FTYPE_DEFAULT;
508 break;
509 case ISOFSMNT_GENS|ISOFSMNT_NORRIP:
510 isomp->iso_ftype = ISO_FTYPE_9660;
511 break;
512 case 0:
513 log(LOG_INFO, "cd9660: RockRidge Extension\n");
514 isomp->iso_ftype = ISO_FTYPE_RRIP;
515 break;
516 }
517 }
518
519 /* Decide whether to use the Joliet descriptor */
520
521 if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) {
522 log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n", joliet_level);
523 rootp = (struct iso_directory_record *)
524 sup->root_directory_record;
525 bcopy (rootp, isomp->root, sizeof isomp->root);
526 isomp->root_extent = isonum_733 (rootp->extent);
527 isomp->root_size = isonum_733 (rootp->size);
528 isomp->joliet_level = joliet_level;
529 supbp->b_flags |= B_AGE;
530 }
531
532 if (supbp) {
533 brelse(supbp);
534 supbp = NULL;
535 }
536
537 vfs_add_vnodeops(mp, &cd9660_vnode_vops, &mp->mnt_vn_norm_ops);
538 vfs_add_vnodeops(mp, &cd9660_spec_vops, &mp->mnt_vn_spec_ops);
539 vfs_add_vnodeops(mp, &cd9660_fifo_vops, &mp->mnt_vn_fifo_ops);
540
541 return 0;
542 out:
543 dev->si_mountpoint = NULL;
544 if (bp)
545 brelse(bp);
546 if (pribp)
547 brelse(pribp);
548 if (supbp)
549 brelse(supbp);
550 if (needclose) {
551 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
552 VOP_CLOSE(devvp, FREAD, NULL);
553 vn_unlock(devvp);
554 }
555 if (isomp) {
556 kfree((caddr_t)isomp, M_ISOFSMNT);
557 mp->mnt_data = (qaddr_t)0;
558 }
559 return error;
560 }
561
562 /*
563 * unmount system call
564 */
565 static int
cd9660_unmount(struct mount * mp,int mntflags)566 cd9660_unmount(struct mount *mp, int mntflags)
567 {
568 struct iso_mnt *isomp;
569 int error, flags = 0;
570
571 if (mntflags & MNT_FORCE)
572 flags |= FORCECLOSE;
573 #if 0
574 mntflushbuf(mp, 0);
575 if (mntinvalbuf(mp))
576 return EBUSY;
577 #endif
578 if ((error = vflush(mp, 0, flags)))
579 return (error);
580
581 isomp = VFSTOISOFS(mp);
582
583 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) {
584 if (isomp->im_d2l)
585 cd9660_iconv->close(isomp->im_d2l);
586 if (isomp->im_l2d)
587 cd9660_iconv->close(isomp->im_l2d);
588 }
589
590 isomp->im_devvp->v_rdev->si_mountpoint = NULL;
591 vn_lock(isomp->im_devvp, LK_EXCLUSIVE | LK_RETRY);
592 error = VOP_CLOSE(isomp->im_devvp, FREAD, NULL);
593 vn_unlock(isomp->im_devvp);
594 vrele(isomp->im_devvp);
595 kfree((caddr_t)isomp, M_ISOFSMNT);
596 mp->mnt_data = (qaddr_t)0;
597 mp->mnt_flag &= ~MNT_LOCAL;
598 return (error);
599 }
600
601 /*
602 * Return root of a filesystem
603 */
604 static int
cd9660_root(struct mount * mp,struct vnode ** vpp)605 cd9660_root(struct mount *mp, struct vnode **vpp)
606 {
607 struct iso_mnt *imp = VFSTOISOFS(mp);
608 struct iso_directory_record *dp =
609 (struct iso_directory_record *)imp->root;
610 ino_t ino = isodirino(dp, imp);
611
612 /*
613 * With RRIP we must use the `.' entry of the root directory.
614 * Simply tell vget, that it's a relocated directory.
615 */
616 return (cd9660_vget_internal(mp, ino, vpp,
617 imp->iso_ftype == ISO_FTYPE_RRIP, dp));
618 }
619
620 /*
621 * Get filesystem statistics.
622 */
623 int
cd9660_statfs(struct mount * mp,struct statfs * sbp,struct ucred * cred)624 cd9660_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
625 {
626 struct iso_mnt *isomp;
627
628 isomp = VFSTOISOFS(mp);
629
630 sbp->f_bsize = isomp->logical_block_size;
631 sbp->f_iosize = sbp->f_bsize; /* XXX */
632 sbp->f_blocks = isomp->volume_space_size;
633 sbp->f_bfree = 0; /* total free blocks */
634 sbp->f_bavail = 0; /* blocks free for non superuser */
635 sbp->f_files = 0; /* total files */
636 sbp->f_ffree = 0; /* free file nodes */
637 if (sbp != &mp->mnt_stat) {
638 sbp->f_type = mp->mnt_vfc->vfc_typenum;
639 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
640 }
641 return 0;
642 }
643
644 /*
645 * File handle to vnode
646 *
647 * Have to be really careful about stale file handles:
648 * - check that the inode number is in range
649 * - call iget() to get the locked inode
650 * - check for an unallocated inode (i_mode == 0)
651 * - check that the generation number matches
652 */
653
654 struct ifid {
655 ushort ifid_len;
656 ushort ifid_pad;
657 int ifid_ino;
658 long ifid_start;
659 };
660
661 /* ARGSUSED */
662 int
cd9660_fhtovp(struct mount * mp,struct vnode * rootvp,struct fid * fhp,struct vnode ** vpp)663 cd9660_fhtovp(struct mount *mp, struct vnode *rootvp,
664 struct fid *fhp, struct vnode **vpp)
665 {
666 struct ifid *ifhp = (struct ifid *)fhp;
667 struct iso_node *ip;
668 struct vnode *nvp;
669 int error;
670
671 #ifdef ISOFS_DBG
672 kprintf("fhtovp: ino %d, start %ld\n",
673 ifhp->ifid_ino, ifhp->ifid_start);
674 #endif
675
676 if ((error = VFS_VGET(mp, NULL, ifhp->ifid_ino, &nvp)) != 0) {
677 *vpp = NULLVP;
678 return (error);
679 }
680 ip = VTOI(nvp);
681 if (ip->inode.iso_mode == 0) {
682 vput(nvp);
683 *vpp = NULLVP;
684 return (ESTALE);
685 }
686 *vpp = nvp;
687 return (0);
688 }
689
690 int
cd9660_checkexp(struct mount * mp,struct sockaddr * nam,int * exflagsp,struct ucred ** credanonp)691 cd9660_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp,
692 struct ucred **credanonp)
693 {
694 struct netcred *np;
695 struct iso_mnt *imp;
696
697 imp = VFSTOISOFS(mp);
698
699 /*
700 * Get the export permission structure for this <mp, client> tuple.
701 */
702 np = vfs_export_lookup(mp, &imp->im_export, nam);
703 if (np == NULL)
704 return (EACCES);
705
706 *exflagsp = np->netc_exflags;
707 *credanonp = &np->netc_anon;
708 return (0);
709 }
710
711 int
cd9660_vget(struct mount * mp,struct vnode * dvp,ino_t ino,struct vnode ** vpp)712 cd9660_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp)
713 {
714
715 /*
716 * XXXX
717 * It would be nice if we didn't always set the `relocated' flag
718 * and force the extra read, but I don't want to think about fixing
719 * that right now.
720 */
721 return (cd9660_vget_internal(mp, ino, vpp,
722 #if 0
723 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP,
724 #else
725 0,
726 #endif
727 NULL));
728 }
729
730 int
cd9660_vget_internal(struct mount * mp,ino_t ino,struct vnode ** vpp,int relocated,struct iso_directory_record * isodir)731 cd9660_vget_internal(struct mount *mp, ino_t ino, struct vnode **vpp,
732 int relocated, struct iso_directory_record *isodir)
733 {
734 struct iso_mnt *imp;
735 struct iso_node *ip;
736 struct buf *bp;
737 struct vnode *vp;
738 cdev_t dev;
739 int error;
740
741 imp = VFSTOISOFS(mp);
742 dev = imp->im_dev;
743 again:
744 if ((*vpp = cd9660_ihashget(dev, ino)) != NULLVP)
745 return (0);
746
747 /* Allocate a new vnode/iso_node. */
748 error = getnewvnode(VT_ISOFS, mp, &vp, 0, 0);
749 if (error) {
750 *vpp = NULLVP;
751 return (error);
752 }
753 ip = kmalloc(sizeof(struct iso_node), M_ISOFSNODE, M_WAITOK | M_ZERO);
754 ip->i_vnode = vp;
755 ip->i_dev = dev;
756 ip->i_number = ino;
757
758 /*
759 * Insert it into the inode hash table and check for a collision.
760 * If a collision occurs, throw away the vnode and try again.
761 */
762 if (cd9660_ihashins(ip) != 0) {
763 kprintf("debug: cd9660 ihashins collision, retrying\n");
764 vx_put(vp);
765 kfree(ip, M_ISOFSNODE);
766 goto again;
767 }
768 vp->v_data = ip;
769
770 if (isodir == NULL) {
771 int lbn, off;
772
773 lbn = lblkno(imp, ino);
774 if (lbn >= imp->volume_space_size) {
775 vx_put(vp);
776 kprintf("fhtovp: lbn exceed volume space %d\n", lbn);
777 return (ESTALE);
778 }
779
780 off = blkoff(imp, ino);
781 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) {
782 vx_put(vp);
783 kprintf("fhtovp: crosses block boundary %d\n",
784 off + ISO_DIRECTORY_RECORD_SIZE);
785 return (ESTALE);
786 }
787
788 error = bread(imp->im_devvp,
789 lblktooff(imp, lbn),
790 imp->logical_block_size, &bp);
791 if (error) {
792 vx_put(vp);
793 brelse(bp);
794 kprintf("fhtovp: bread error %d\n",error);
795 return (error);
796 }
797 isodir = (struct iso_directory_record *)(bp->b_data + off);
798
799 if (off + isonum_711(isodir->length) >
800 imp->logical_block_size) {
801 vx_put(vp);
802 if (bp != NULL)
803 brelse(bp);
804 kprintf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n",
805 off +isonum_711(isodir->length), off,
806 isonum_711(isodir->length));
807 return (ESTALE);
808 }
809
810 #if 0
811 if (isonum_733(isodir->extent) +
812 isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) {
813 if (bp != NULL)
814 brelse(bp);
815 kprintf("fhtovp: file start miss %d vs %d\n",
816 isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length),
817 ifhp->ifid_start);
818 return (ESTALE);
819 }
820 #endif
821 } else
822 bp = NULL;
823
824 ip->i_mnt = imp;
825 ip->i_devvp = imp->im_devvp;
826 vref(ip->i_devvp);
827
828 if (relocated) {
829 /*
830 * On relocated directories we must
831 * read the `.' entry out of a dir.
832 */
833 ip->iso_start = ino >> imp->im_bshift;
834 if (bp != NULL)
835 brelse(bp);
836 if ((error = cd9660_devblkatoff(vp, (off_t)0, NULL, &bp)) != 0) {
837 vx_put(vp);
838 return (error);
839 }
840 isodir = (struct iso_directory_record *)bp->b_data;
841 }
842
843 ip->iso_extent = isonum_733(isodir->extent);
844 ip->i_size = isonum_733(isodir->size);
845 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent;
846
847 /*
848 * Setup time stamp, attribute
849 */
850 vp->v_type = VNON;
851 switch (imp->iso_ftype) {
852 default: /* ISO_FTYPE_9660 */
853 {
854 struct buf *bp2;
855 int off;
856 if ((imp->im_flags & ISOFSMNT_EXTATT)
857 && (off = isonum_711(isodir->ext_attr_length)))
858 cd9660_devblkatoff(vp, (off_t)-(off << imp->im_bshift), NULL,
859 &bp2);
860 else
861 bp2 = NULL;
862 cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660);
863 cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660);
864 if (bp2)
865 brelse(bp2);
866 break;
867 }
868 case ISO_FTYPE_RRIP:
869 cd9660_rrip_analyze(isodir, ip, imp);
870 break;
871 }
872
873 if (bp != NULL)
874 brelse(bp);
875
876 /*
877 * Initialize the associated vnode
878 */
879 vp->v_type = IFTOVT(ip->inode.iso_mode);
880
881 switch (vp->v_type) {
882 case VFIFO:
883 vp->v_ops = &mp->mnt_vn_fifo_ops;
884 break;
885 case VCHR:
886 case VBLK:
887 vp->v_ops = &mp->mnt_vn_spec_ops;
888 addaliasu(vp, umajor(ip->inode.iso_rdev),
889 uminor(ip->inode.iso_rdev));
890 break;
891 case VREG:
892 case VDIR:
893 vinitvmio(vp, ip->i_size, PAGE_SIZE, -1);
894 break;
895 default:
896 break;
897 }
898
899 if (ip->iso_extent == imp->root_extent)
900 vsetflags(vp, VROOT);
901
902 /*
903 * Return the locked and refd vp
904 */
905 vx_downgrade(vp);
906 *vpp = vp;
907 return (0);
908 }
909
910 /*
911 * Vnode pointer to File handle
912 */
913 /* ARGSUSED */
914 int
cd9660_vptofh(struct vnode * vp,struct fid * fhp)915 cd9660_vptofh(struct vnode *vp, struct fid *fhp)
916 {
917 struct iso_node *ip = VTOI(vp);
918 struct ifid *ifhp;
919
920 ifhp = (struct ifid *)fhp;
921 ifhp->ifid_len = sizeof(struct ifid);
922
923 ifhp->ifid_ino = ip->i_number;
924 ifhp->ifid_start = ip->iso_start;
925
926 #ifdef ISOFS_DBG
927 kprintf("vptofh: ino %d, start %ld\n",
928 ifhp->ifid_ino,ifhp->ifid_start);
929 #endif
930 return 0;
931 }
932