1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley
8 * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension
9 * Support code is derived from software contributed to Berkeley
10 * by Atsushi Murai (amurai@spec.co.jp).
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)cd9660_vnops.c 8.19 (Berkeley) 5/27/95
37 */
38
39 #include <sys/cdefs.h>
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/namei.h>
43 #include <sys/kernel.h>
44 #include <sys/conf.h>
45 #include <sys/stat.h>
46 #include <sys/bio.h>
47 #include <sys/buf.h>
48 #include <sys/mount.h>
49 #include <sys/vnode.h>
50 #include <sys/malloc.h>
51 #include <sys/dirent.h>
52 #include <sys/unistd.h>
53 #include <sys/filio.h>
54 #include <sys/sysctl.h>
55
56 #include <vm/vm.h>
57 #include <vm/vnode_pager.h>
58 #include <vm/uma.h>
59
60 #include <fs/cd9660/iso.h>
61 #include <fs/cd9660/cd9660_node.h>
62 #include <fs/cd9660/cd9660_mount.h>
63 #include <fs/cd9660/iso_rrip.h>
64
65 static vop_setattr_t cd9660_setattr;
66 static vop_open_t cd9660_open;
67 static vop_access_t cd9660_access;
68 static vop_getattr_t cd9660_getattr;
69 static vop_ioctl_t cd9660_ioctl;
70 static vop_pathconf_t cd9660_pathconf;
71 static vop_read_t cd9660_read;
72 struct isoreaddir;
73 static int iso_uiodir(struct isoreaddir *idp, struct dirent *dp, off_t off);
74 static int iso_shipdir(struct isoreaddir *idp);
75 static vop_readdir_t cd9660_readdir;
76 static vop_readlink_t cd9660_readlink;
77 static vop_strategy_t cd9660_strategy;
78 static vop_vptofh_t cd9660_vptofh;
79 static vop_getpages_t cd9660_getpages;
80
81 /*
82 * Setattr call. Only allowed for block and character special devices.
83 */
84 static int
cd9660_setattr(ap)85 cd9660_setattr(ap)
86 struct vop_setattr_args /* {
87 struct vnodeop_desc *a_desc;
88 struct vnode *a_vp;
89 struct vattr *a_vap;
90 struct ucred *a_cred;
91 } */ *ap;
92 {
93 struct vnode *vp = ap->a_vp;
94 struct vattr *vap = ap->a_vap;
95
96 if (vap->va_flags != (u_long)VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
97 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
98 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL)
99 return (EROFS);
100 if (vap->va_size != (u_quad_t)VNOVAL) {
101 switch (vp->v_type) {
102 case VDIR:
103 return (EISDIR);
104 case VLNK:
105 case VREG:
106 return (EROFS);
107 case VCHR:
108 case VBLK:
109 case VSOCK:
110 case VFIFO:
111 case VNON:
112 case VBAD:
113 case VMARKER:
114 return (0);
115 }
116 }
117 return (0);
118 }
119
120 /*
121 * Check mode permission on inode pointer. Mode is READ, WRITE or EXEC.
122 * The mode is shifted to select the owner/group/other fields. The
123 * super user is granted all permissions.
124 */
125 /* ARGSUSED */
126 static int
cd9660_access(ap)127 cd9660_access(ap)
128 struct vop_access_args /* {
129 struct vnode *a_vp;
130 accmode_t a_accmode;
131 struct ucred *a_cred;
132 struct thread *a_td;
133 } */ *ap;
134 {
135 struct vnode *vp = ap->a_vp;
136 struct iso_node *ip = VTOI(vp);
137 accmode_t accmode = ap->a_accmode;
138 accmode_t file_mode;
139 uid_t uid;
140 gid_t gid;
141
142 if (vp->v_type == VCHR || vp->v_type == VBLK)
143 return (EOPNOTSUPP);
144
145 /*
146 * Disallow write attempts unless the file is a socket,
147 * fifo, or a block or character device resident on the
148 * filesystem.
149 */
150 if (accmode & VWRITE) {
151 switch (vp->v_type) {
152 case VDIR:
153 case VLNK:
154 case VREG:
155 return (EROFS);
156 /* NOT REACHED */
157 default:
158 break;
159 }
160 }
161
162 file_mode = ip->inode.iso_mode;
163 file_mode &= (vp->v_type == VDIR) ? ip->i_mnt->im_dmask : ip->i_mnt->im_fmask;
164
165 uid = (ip->i_mnt->im_flags & ISOFSMNT_UID) ?
166 ip->i_mnt->im_uid : ip->inode.iso_uid;
167 gid = (ip->i_mnt->im_flags & ISOFSMNT_GID) ?
168 ip->i_mnt->im_gid : ip->inode.iso_gid;
169
170 return (vaccess(vp->v_type, file_mode, uid,
171 gid, ap->a_accmode, ap->a_cred));
172 }
173
174 static int
cd9660_open(ap)175 cd9660_open(ap)
176 struct vop_open_args /* {
177 struct vnode *a_vp;
178 int a_mode;
179 struct ucred *a_cred;
180 struct thread *a_td;
181 struct file *a_fp;
182 } */ *ap;
183 {
184 struct vnode *vp = ap->a_vp;
185 struct iso_node *ip = VTOI(vp);
186
187 if (vp->v_type == VCHR || vp->v_type == VBLK)
188 return (EOPNOTSUPP);
189
190 vnode_create_vobject(vp, ip->i_size, ap->a_td);
191 return (0);
192 }
193
194 static int
cd9660_getattr(ap)195 cd9660_getattr(ap)
196 struct vop_getattr_args /* {
197 struct vnode *a_vp;
198 struct vattr *a_vap;
199 struct ucred *a_cred;
200 } */ *ap;
201
202 {
203 struct vnode *vp = ap->a_vp;
204 struct vattr *vap = ap->a_vap;
205 struct iso_node *ip = VTOI(vp);
206
207 vap->va_fsid = dev2udev(ip->i_mnt->im_dev);
208 vap->va_fileid = ip->i_number;
209
210 vap->va_mode = ip->inode.iso_mode;
211 vap->va_mode &= (vp->v_type == VDIR) ? ip->i_mnt->im_dmask : ip->i_mnt->im_fmask;
212
213 vap->va_nlink = ip->inode.iso_links;
214 vap->va_uid = (ip->i_mnt->im_flags & ISOFSMNT_UID) ?
215 ip->i_mnt->im_uid : ip->inode.iso_uid;
216 vap->va_gid = (ip->i_mnt->im_flags & ISOFSMNT_GID) ?
217 ip->i_mnt->im_gid : ip->inode.iso_gid;
218 vap->va_atime = ip->inode.iso_atime;
219 vap->va_mtime = ip->inode.iso_mtime;
220 vap->va_ctime = ip->inode.iso_ctime;
221 vap->va_rdev = ip->inode.iso_rdev;
222
223 vap->va_size = (u_quad_t) ip->i_size;
224 if (ip->i_size == 0 && (vap->va_mode & S_IFMT) == S_IFLNK) {
225 struct vop_readlink_args rdlnk;
226 struct iovec aiov;
227 struct uio auio;
228 char *cp;
229
230 cp = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
231 aiov.iov_base = cp;
232 aiov.iov_len = MAXPATHLEN;
233 auio.uio_iov = &aiov;
234 auio.uio_iovcnt = 1;
235 auio.uio_offset = 0;
236 auio.uio_rw = UIO_READ;
237 auio.uio_segflg = UIO_SYSSPACE;
238 auio.uio_td = curthread;
239 auio.uio_resid = MAXPATHLEN;
240 rdlnk.a_uio = &auio;
241 rdlnk.a_vp = ap->a_vp;
242 rdlnk.a_cred = ap->a_cred;
243 if (cd9660_readlink(&rdlnk) == 0)
244 vap->va_size = MAXPATHLEN - auio.uio_resid;
245 free(cp, M_TEMP);
246 }
247 vap->va_flags = 0;
248 vap->va_gen = 1;
249 vap->va_blocksize = ip->i_mnt->logical_block_size;
250 vap->va_bytes = (u_quad_t) ip->i_size;
251 vap->va_type = vp->v_type;
252 vap->va_filerev = 0;
253 return (0);
254 }
255
256 /*
257 * Vnode op for ioctl.
258 */
259 static int
cd9660_ioctl(ap)260 cd9660_ioctl(ap)
261 struct vop_ioctl_args /* {
262 struct vnode *a_vp;
263 u_long a_command;
264 caddr_t a_data;
265 int a_fflag;
266 struct ucred *a_cred;
267 struct thread *a_td;
268 } */ *ap;
269 {
270 struct vnode *vp;
271 struct iso_node *ip;
272 int error;
273
274 vp = ap->a_vp;
275 vn_lock(vp, LK_SHARED | LK_RETRY);
276 if (VN_IS_DOOMED(vp)) {
277 VOP_UNLOCK(vp);
278 return (EBADF);
279 }
280 if (vp->v_type == VCHR || vp->v_type == VBLK) {
281 VOP_UNLOCK(vp);
282 return (EOPNOTSUPP);
283 }
284
285 ip = VTOI(vp);
286 error = 0;
287
288 switch (ap->a_command) {
289 case FIOGETLBA:
290 *(int *)(ap->a_data) = ip->iso_start;
291 break;
292 default:
293 error = ENOTTY;
294 break;
295 }
296
297 VOP_UNLOCK(vp);
298 return (error);
299 }
300
301 /*
302 * Vnode op for reading.
303 */
304 static int
cd9660_read(ap)305 cd9660_read(ap)
306 struct vop_read_args /* {
307 struct vnode *a_vp;
308 struct uio *a_uio;
309 int a_ioflag;
310 struct ucred *a_cred;
311 } */ *ap;
312 {
313 struct vnode *vp = ap->a_vp;
314 struct uio *uio = ap->a_uio;
315 struct iso_node *ip = VTOI(vp);
316 struct iso_mnt *imp;
317 struct buf *bp;
318 daddr_t lbn, rablock;
319 off_t diff;
320 int rasize, error = 0;
321 int seqcount;
322 long size, n, on;
323
324 if (vp->v_type == VCHR || vp->v_type == VBLK)
325 return (EOPNOTSUPP);
326
327 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
328
329 if (uio->uio_resid == 0)
330 return (0);
331 if (uio->uio_offset < 0)
332 return (EINVAL);
333 imp = ip->i_mnt;
334 do {
335 lbn = lblkno(imp, uio->uio_offset);
336 on = blkoff(imp, uio->uio_offset);
337 n = MIN(imp->logical_block_size - on, uio->uio_resid);
338 diff = (off_t)ip->i_size - uio->uio_offset;
339 if (diff <= 0)
340 return (0);
341 if (diff < n)
342 n = diff;
343 size = blksize(imp, ip, lbn);
344 rablock = lbn + 1;
345 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
346 if (lblktosize(imp, rablock) < ip->i_size)
347 error = cluster_read(vp, (off_t)ip->i_size,
348 lbn, size, NOCRED, uio->uio_resid,
349 (ap->a_ioflag >> 16), 0, &bp);
350 else
351 error = bread(vp, lbn, size, NOCRED, &bp);
352 } else {
353 if (seqcount > 1 &&
354 lblktosize(imp, rablock) < ip->i_size) {
355 rasize = blksize(imp, ip, rablock);
356 error = breadn(vp, lbn, size, &rablock,
357 &rasize, 1, NOCRED, &bp);
358 } else
359 error = bread(vp, lbn, size, NOCRED, &bp);
360 }
361 if (error != 0)
362 return (error);
363 n = MIN(n, size - bp->b_resid);
364
365 error = uiomove(bp->b_data + on, (int)n, uio);
366 brelse(bp);
367 } while (error == 0 && uio->uio_resid > 0 && n != 0);
368 return (error);
369 }
370
371 /*
372 * Structure for reading directories
373 */
374 struct isoreaddir {
375 struct dirent saveent;
376 struct dirent assocent;
377 struct dirent current;
378 off_t saveoff;
379 off_t assocoff;
380 off_t curroff;
381 struct uio *uio;
382 off_t uio_off;
383 int eofflag;
384 u_long *cookies;
385 int ncookies;
386 };
387
388 static int
iso_uiodir(idp,dp,off)389 iso_uiodir(idp,dp,off)
390 struct isoreaddir *idp;
391 struct dirent *dp;
392 off_t off;
393 {
394 int error;
395
396 dp->d_reclen = GENERIC_DIRSIZ(dp);
397 dirent_terminate(dp);
398
399 if (idp->uio->uio_resid < dp->d_reclen) {
400 idp->eofflag = 0;
401 return (-1);
402 }
403
404 if (idp->cookies) {
405 if (idp->ncookies <= 0) {
406 idp->eofflag = 0;
407 return (-1);
408 }
409
410 *idp->cookies++ = off;
411 --idp->ncookies;
412 }
413
414 if ((error = uiomove(dp, dp->d_reclen, idp->uio)) != 0)
415 return (error);
416 idp->uio_off = off;
417 return (0);
418 }
419
420 static int
iso_shipdir(idp)421 iso_shipdir(idp)
422 struct isoreaddir *idp;
423 {
424 struct dirent *dp;
425 int cl, sl, assoc;
426 int error;
427 char *cname, *sname;
428
429 cl = idp->current.d_namlen;
430 cname = idp->current.d_name;
431 assoc = (cl > 1) && (*cname == ASSOCCHAR);
432 if (assoc) {
433 cl--;
434 cname++;
435 }
436
437 dp = &idp->saveent;
438 sname = dp->d_name;
439 if (!(sl = dp->d_namlen)) {
440 dp = &idp->assocent;
441 sname = dp->d_name + 1;
442 sl = dp->d_namlen - 1;
443 }
444 if (sl > 0) {
445 if (sl != cl
446 || bcmp(sname,cname,sl)) {
447 if (idp->assocent.d_namlen) {
448 if ((error = iso_uiodir(idp,&idp->assocent,idp->assocoff)) != 0)
449 return (error);
450 idp->assocent.d_namlen = 0;
451 }
452 if (idp->saveent.d_namlen) {
453 if ((error = iso_uiodir(idp,&idp->saveent,idp->saveoff)) != 0)
454 return (error);
455 idp->saveent.d_namlen = 0;
456 }
457 }
458 }
459 idp->current.d_reclen = GENERIC_DIRSIZ(&idp->current);
460 if (assoc) {
461 idp->assocoff = idp->curroff;
462 memcpy(&idp->assocent, &idp->current, idp->current.d_reclen);
463 } else {
464 idp->saveoff = idp->curroff;
465 memcpy(&idp->saveent, &idp->current, idp->current.d_reclen);
466 }
467 return (0);
468 }
469
470 /*
471 * Vnode op for readdir
472 */
473 static int
cd9660_readdir(ap)474 cd9660_readdir(ap)
475 struct vop_readdir_args /* {
476 struct vnode *a_vp;
477 struct uio *a_uio;
478 struct ucred *a_cred;
479 int *a_eofflag;
480 int *a_ncookies;
481 u_long **a_cookies;
482 } */ *ap;
483 {
484 struct uio *uio = ap->a_uio;
485 struct isoreaddir *idp;
486 struct vnode *vdp = ap->a_vp;
487 struct iso_node *dp;
488 struct iso_mnt *imp;
489 struct buf *bp = NULL;
490 struct iso_directory_record *ep;
491 int entryoffsetinblock;
492 doff_t endsearch;
493 u_long bmask;
494 int error = 0;
495 int reclen;
496 u_short namelen;
497 u_int ncookies = 0;
498 u_long *cookies = NULL;
499 cd_ino_t ino;
500
501 dp = VTOI(vdp);
502 imp = dp->i_mnt;
503 bmask = imp->im_bmask;
504
505 idp = malloc(sizeof(*idp), M_TEMP, M_WAITOK);
506 idp->saveent.d_namlen = idp->assocent.d_namlen = 0;
507 /*
508 * XXX
509 * Is it worth trying to figure out the type?
510 */
511 idp->saveent.d_type = idp->assocent.d_type = idp->current.d_type =
512 DT_UNKNOWN;
513 idp->uio = uio;
514 if (ap->a_ncookies == NULL) {
515 idp->cookies = NULL;
516 } else {
517 /*
518 * Guess the number of cookies needed.
519 */
520 ncookies = uio->uio_resid / 16;
521 cookies = malloc(ncookies * sizeof(u_long),
522 M_TEMP, M_WAITOK);
523 idp->cookies = cookies;
524 idp->ncookies = ncookies;
525 }
526 idp->eofflag = 1;
527 idp->curroff = uio->uio_offset;
528 idp->uio_off = uio->uio_offset;
529
530 if ((entryoffsetinblock = idp->curroff & bmask) &&
531 (error = cd9660_blkatoff(vdp, (off_t)idp->curroff, NULL, &bp))) {
532 free(idp, M_TEMP);
533 return (error);
534 }
535 endsearch = dp->i_size;
536
537 while (idp->curroff < endsearch) {
538 /*
539 * If offset is on a block boundary,
540 * read the next directory block.
541 * Release previous if it exists.
542 */
543 if ((idp->curroff & bmask) == 0) {
544 if (bp != NULL)
545 brelse(bp);
546 if ((error =
547 cd9660_blkatoff(vdp, (off_t)idp->curroff, NULL, &bp)) != 0)
548 break;
549 entryoffsetinblock = 0;
550 }
551 /*
552 * Get pointer to next entry.
553 */
554 ep = (struct iso_directory_record *)
555 ((char *)bp->b_data + entryoffsetinblock);
556
557 reclen = isonum_711(ep->length);
558 if (reclen == 0) {
559 /* skip to next block, if any */
560 idp->curroff =
561 (idp->curroff & ~bmask) + imp->logical_block_size;
562 continue;
563 }
564
565 if (reclen < ISO_DIRECTORY_RECORD_SIZE) {
566 error = EINVAL;
567 /* illegal entry, stop */
568 break;
569 }
570
571 if (entryoffsetinblock + reclen > imp->logical_block_size) {
572 error = EINVAL;
573 /* illegal directory, so stop looking */
574 break;
575 }
576
577 idp->current.d_namlen = isonum_711(ep->name_len);
578
579 if (reclen < ISO_DIRECTORY_RECORD_SIZE + idp->current.d_namlen) {
580 error = EINVAL;
581 /* illegal entry, stop */
582 break;
583 }
584
585 if (isonum_711(ep->flags)&2)
586 idp->current.d_fileno = isodirino(ep, imp);
587 else
588 idp->current.d_fileno = dbtob(bp->b_blkno) +
589 entryoffsetinblock;
590
591 idp->curroff += reclen;
592 /* NOTE: d_off is the offset of *next* entry. */
593 idp->current.d_off = idp->curroff;
594
595 switch (imp->iso_ftype) {
596 case ISO_FTYPE_RRIP:
597 ino = idp->current.d_fileno;
598 cd9660_rrip_getname(ep, idp->current.d_name, &namelen,
599 &ino, imp);
600 idp->current.d_fileno = ino;
601 idp->current.d_namlen = (u_char)namelen;
602 if (idp->current.d_namlen)
603 error = iso_uiodir(idp,&idp->current,idp->curroff);
604 break;
605 default: /* ISO_FTYPE_DEFAULT || ISO_FTYPE_9660 || ISO_FTYPE_HIGH_SIERRA*/
606 strcpy(idp->current.d_name,"..");
607 if (idp->current.d_namlen == 1 && ep->name[0] == 0) {
608 idp->current.d_namlen = 1;
609 error = iso_uiodir(idp,&idp->current,idp->curroff);
610 } else if (idp->current.d_namlen == 1 && ep->name[0] == 1) {
611 idp->current.d_namlen = 2;
612 error = iso_uiodir(idp,&idp->current,idp->curroff);
613 } else {
614 isofntrans(ep->name,idp->current.d_namlen,
615 idp->current.d_name, &namelen,
616 imp->iso_ftype == ISO_FTYPE_9660,
617 isonum_711(ep->flags)&4,
618 imp->joliet_level,
619 imp->im_flags,
620 imp->im_d2l);
621 idp->current.d_namlen = (u_char)namelen;
622 if (imp->iso_ftype == ISO_FTYPE_DEFAULT)
623 error = iso_shipdir(idp);
624 else
625 error = iso_uiodir(idp,&idp->current,idp->curroff);
626 }
627 }
628 if (error)
629 break;
630
631 entryoffsetinblock += reclen;
632 }
633
634 if (!error && imp->iso_ftype == ISO_FTYPE_DEFAULT) {
635 idp->current.d_namlen = 0;
636 error = iso_shipdir(idp);
637 }
638 if (error < 0)
639 error = 0;
640
641 if (ap->a_ncookies != NULL) {
642 if (error)
643 free(cookies, M_TEMP);
644 else {
645 /*
646 * Work out the number of cookies actually used.
647 */
648 *ap->a_ncookies = ncookies - idp->ncookies;
649 *ap->a_cookies = cookies;
650 }
651 }
652
653 if (bp)
654 brelse (bp);
655
656 uio->uio_offset = idp->uio_off;
657 *ap->a_eofflag = idp->eofflag;
658
659 free(idp, M_TEMP);
660
661 return (error);
662 }
663
664 /*
665 * Return target name of a symbolic link
666 * Shouldn't we get the parent vnode and read the data from there?
667 * This could eventually result in deadlocks in cd9660_lookup.
668 * But otherwise the block read here is in the block buffer two times.
669 */
670 typedef struct iso_directory_record ISODIR;
671 typedef struct iso_node ISONODE;
672 typedef struct iso_mnt ISOMNT;
673 static int
cd9660_readlink(ap)674 cd9660_readlink(ap)
675 struct vop_readlink_args /* {
676 struct vnode *a_vp;
677 struct uio *a_uio;
678 struct ucred *a_cred;
679 } */ *ap;
680 {
681 ISONODE *ip;
682 ISODIR *dirp;
683 ISOMNT *imp;
684 struct buf *bp;
685 struct uio *uio;
686 u_short symlen;
687 int error;
688 char *symname;
689
690 ip = VTOI(ap->a_vp);
691 imp = ip->i_mnt;
692 uio = ap->a_uio;
693
694 if (imp->iso_ftype != ISO_FTYPE_RRIP)
695 return (EINVAL);
696
697 /*
698 * Get parents directory record block that this inode included.
699 */
700 error = bread(imp->im_devvp,
701 (ip->i_number >> imp->im_bshift) <<
702 (imp->im_bshift - DEV_BSHIFT),
703 imp->logical_block_size, NOCRED, &bp);
704 if (error) {
705 return (EINVAL);
706 }
707
708 /*
709 * Setup the directory pointer for this inode
710 */
711 dirp = (ISODIR *)(bp->b_data + (ip->i_number & imp->im_bmask));
712
713 /*
714 * Just make sure, we have a right one....
715 * 1: Check not cross boundary on block
716 */
717 if ((ip->i_number & imp->im_bmask) + isonum_711(dirp->length)
718 > (unsigned)imp->logical_block_size) {
719 brelse(bp);
720 return (EINVAL);
721 }
722
723 /*
724 * Now get a buffer
725 * Abuse a namei buffer for now.
726 */
727 if (uio->uio_segflg == UIO_SYSSPACE)
728 symname = uio->uio_iov->iov_base;
729 else
730 symname = uma_zalloc(namei_zone, M_WAITOK);
731
732 /*
733 * Ok, we just gathering a symbolic name in SL record.
734 */
735 if (cd9660_rrip_getsymname(dirp, symname, &symlen, imp) == 0) {
736 if (uio->uio_segflg != UIO_SYSSPACE)
737 uma_zfree(namei_zone, symname);
738 brelse(bp);
739 return (EINVAL);
740 }
741 /*
742 * Don't forget before you leave from home ;-)
743 */
744 brelse(bp);
745
746 /*
747 * return with the symbolic name to caller's.
748 */
749 if (uio->uio_segflg != UIO_SYSSPACE) {
750 error = uiomove(symname, symlen, uio);
751 uma_zfree(namei_zone, symname);
752 return (error);
753 }
754 uio->uio_resid -= symlen;
755 uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + symlen;
756 uio->uio_iov->iov_len -= symlen;
757 return (0);
758 }
759
760 /*
761 * Calculate the logical to physical mapping if not done already,
762 * then call the device strategy routine.
763 */
764 static int
cd9660_strategy(ap)765 cd9660_strategy(ap)
766 struct vop_strategy_args /* {
767 struct buf *a_vp;
768 struct buf *a_bp;
769 } */ *ap;
770 {
771 struct buf *bp = ap->a_bp;
772 struct vnode *vp = ap->a_vp;
773 struct iso_node *ip;
774 struct bufobj *bo;
775
776 ip = VTOI(vp);
777 if (vp->v_type == VBLK || vp->v_type == VCHR)
778 panic("cd9660_strategy: spec");
779 if (bp->b_blkno == bp->b_lblkno) {
780 bp->b_blkno = (ip->iso_start + bp->b_lblkno) <<
781 (ip->i_mnt->im_bshift - DEV_BSHIFT);
782 }
783 bp->b_iooffset = dbtob(bp->b_blkno);
784 bo = ip->i_mnt->im_bo;
785 BO_STRATEGY(bo, bp);
786 return (0);
787 }
788
789 /*
790 * Return POSIX pathconf information applicable to cd9660 filesystems.
791 */
792 static int
cd9660_pathconf(ap)793 cd9660_pathconf(ap)
794 struct vop_pathconf_args /* {
795 struct vnode *a_vp;
796 int a_name;
797 register_t *a_retval;
798 } */ *ap;
799 {
800
801 switch (ap->a_name) {
802 case _PC_FILESIZEBITS:
803 *ap->a_retval = 32;
804 return (0);
805 case _PC_LINK_MAX:
806 *ap->a_retval = 1;
807 return (0);
808 case _PC_NAME_MAX:
809 if (VTOI(ap->a_vp)->i_mnt->iso_ftype == ISO_FTYPE_RRIP)
810 *ap->a_retval = NAME_MAX;
811 else
812 *ap->a_retval = 37;
813 return (0);
814 case _PC_SYMLINK_MAX:
815 if (VTOI(ap->a_vp)->i_mnt->iso_ftype == ISO_FTYPE_RRIP) {
816 *ap->a_retval = MAXPATHLEN;
817 return (0);
818 }
819 return (EINVAL);
820 case _PC_NO_TRUNC:
821 *ap->a_retval = 1;
822 return (0);
823 default:
824 return (vop_stdpathconf(ap));
825 }
826 /* NOTREACHED */
827 }
828
829 _Static_assert(sizeof(struct ifid) <= sizeof(struct fid),
830 "struct ifid must be no larger than struct fid");
831
832 /*
833 * Vnode pointer to File handle
834 */
835 static int
cd9660_vptofh(ap)836 cd9660_vptofh(ap)
837 struct vop_vptofh_args /* {
838 struct vnode *a_vp;
839 struct fid *a_fhp;
840 } */ *ap;
841 {
842 struct ifid ifh;
843 struct iso_node *ip = VTOI(ap->a_vp);
844
845 ifh.ifid_len = sizeof(struct ifid);
846
847 ifh.ifid_ino = ip->i_number;
848 ifh.ifid_start = ip->iso_start;
849 /*
850 * This intentionally uses sizeof(ifh) in order to not copy stack
851 * garbage on ILP32.
852 */
853 memcpy(ap->a_fhp, &ifh, sizeof(ifh));
854
855 #ifdef ISOFS_DBG
856 printf("vptofh: ino %jd, start %ld\n",
857 (uintmax_t)ifh.ifid_ino, ifh.ifid_start);
858 #endif
859
860 return (0);
861 }
862
863 SYSCTL_NODE(_vfs, OID_AUTO, cd9660, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
864 "cd9660 filesystem");
865 static int use_buf_pager = 1;
866 SYSCTL_INT(_vfs_cd9660, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN,
867 &use_buf_pager, 0,
868 "Use buffer pager instead of bmap");
869
870 static daddr_t
cd9660_gbp_getblkno(struct vnode * vp,vm_ooffset_t off)871 cd9660_gbp_getblkno(struct vnode *vp, vm_ooffset_t off)
872 {
873
874 return (lblkno(VTOI(vp)->i_mnt, off));
875 }
876
877 static int
cd9660_gbp_getblksz(struct vnode * vp,daddr_t lbn,long * sz)878 cd9660_gbp_getblksz(struct vnode *vp, daddr_t lbn, long *sz)
879 {
880 struct iso_node *ip;
881
882 ip = VTOI(vp);
883 *sz = blksize(ip->i_mnt, ip, lbn);
884 return (0);
885 }
886
887 static int
cd9660_getpages(struct vop_getpages_args * ap)888 cd9660_getpages(struct vop_getpages_args *ap)
889 {
890 struct vnode *vp;
891
892 vp = ap->a_vp;
893 if (vp->v_type == VCHR || vp->v_type == VBLK)
894 return (EOPNOTSUPP);
895
896 if (use_buf_pager)
897 return (vfs_bio_getpages(vp, ap->a_m, ap->a_count,
898 ap->a_rbehind, ap->a_rahead, cd9660_gbp_getblkno,
899 cd9660_gbp_getblksz));
900 return (vnode_pager_generic_getpages(vp, ap->a_m, ap->a_count,
901 ap->a_rbehind, ap->a_rahead, NULL, NULL));
902 }
903
904 /*
905 * Global vfs data structures for cd9660
906 */
907 struct vop_vector cd9660_vnodeops = {
908 .vop_default = &default_vnodeops,
909 .vop_open = cd9660_open,
910 .vop_access = cd9660_access,
911 .vop_bmap = cd9660_bmap,
912 .vop_cachedlookup = cd9660_lookup,
913 .vop_getattr = cd9660_getattr,
914 .vop_inactive = cd9660_inactive,
915 .vop_ioctl = cd9660_ioctl,
916 .vop_lookup = vfs_cache_lookup,
917 .vop_pathconf = cd9660_pathconf,
918 .vop_read = cd9660_read,
919 .vop_readdir = cd9660_readdir,
920 .vop_readlink = cd9660_readlink,
921 .vop_reclaim = cd9660_reclaim,
922 .vop_setattr = cd9660_setattr,
923 .vop_strategy = cd9660_strategy,
924 .vop_vptofh = cd9660_vptofh,
925 .vop_getpages = cd9660_getpages,
926 };
927 VFS_VOP_VECTOR_REGISTER(cd9660_vnodeops);
928
929 /*
930 * Special device vnode ops
931 */
932
933 struct vop_vector cd9660_fifoops = {
934 .vop_default = &fifo_specops,
935 .vop_access = cd9660_access,
936 .vop_getattr = cd9660_getattr,
937 .vop_inactive = cd9660_inactive,
938 .vop_reclaim = cd9660_reclaim,
939 .vop_setattr = cd9660_setattr,
940 .vop_vptofh = cd9660_vptofh,
941 };
942 VFS_VOP_VECTOR_REGISTER(cd9660_fifoops);
943