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
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/namei.h>
40 #include <sys/kernel.h>
41 #include <sys/conf.h>
42 #include <sys/stat.h>
43 #include <sys/bio.h>
44 #include <sys/buf.h>
45 #include <sys/mount.h>
46 #include <sys/vnode.h>
47 #include <sys/malloc.h>
48 #include <sys/dirent.h>
49 #include <sys/unistd.h>
50 #include <sys/filio.h>
51 #include <sys/sysctl.h>
52
53 #include <vm/vm.h>
54 #include <vm/vnode_pager.h>
55 #include <vm/uma.h>
56
57 #include <fs/cd9660/iso.h>
58 #include <fs/cd9660/cd9660_node.h>
59 #include <fs/cd9660/cd9660_mount.h>
60 #include <fs/cd9660/iso_rrip.h>
61
62 static vop_setattr_t cd9660_setattr;
63 static vop_open_t cd9660_open;
64 static vop_access_t cd9660_access;
65 static vop_getattr_t cd9660_getattr;
66 static vop_ioctl_t cd9660_ioctl;
67 static vop_pathconf_t cd9660_pathconf;
68 static vop_read_t cd9660_read;
69 struct isoreaddir;
70 static int iso_uiodir(struct isoreaddir *idp, struct dirent *dp, off_t off);
71 static int iso_shipdir(struct isoreaddir *idp);
72 static vop_readdir_t cd9660_readdir;
73 static vop_readlink_t cd9660_readlink;
74 static vop_strategy_t cd9660_strategy;
75 static vop_vptofh_t cd9660_vptofh;
76 static vop_getpages_t cd9660_getpages;
77
78 /*
79 * Setattr call. Only allowed for block and character special devices.
80 */
81 static int
cd9660_setattr(struct vop_setattr_args * ap)82 cd9660_setattr(struct vop_setattr_args *ap)
83 {
84 struct vnode *vp = ap->a_vp;
85 struct vattr *vap = ap->a_vap;
86
87 if (vap->va_flags != (u_long)VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
88 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
89 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL)
90 return (EROFS);
91 if (vap->va_size != (u_quad_t)VNOVAL) {
92 switch (vp->v_type) {
93 case VDIR:
94 return (EISDIR);
95 case VLNK:
96 case VREG:
97 return (EROFS);
98 case VCHR:
99 case VBLK:
100 case VSOCK:
101 case VFIFO:
102 case VNON:
103 case VBAD:
104 case VMARKER:
105 return (0);
106 }
107 }
108 return (0);
109 }
110
111 /*
112 * Check mode permission on inode pointer. Mode is READ, WRITE or EXEC.
113 * The mode is shifted to select the owner/group/other fields. The
114 * super user is granted all permissions.
115 */
116 /* ARGSUSED */
117 static int
cd9660_access(struct vop_access_args * ap)118 cd9660_access(struct vop_access_args *ap)
119 {
120 struct vnode *vp = ap->a_vp;
121 struct iso_node *ip = VTOI(vp);
122 accmode_t accmode = ap->a_accmode;
123 accmode_t file_mode;
124 uid_t uid;
125 gid_t gid;
126
127 if (VN_ISDEV(vp))
128 return (EOPNOTSUPP);
129
130 /*
131 * Disallow write attempts unless the file is a socket,
132 * fifo, or a block or character device resident on the
133 * filesystem.
134 */
135 if (accmode & VWRITE) {
136 switch (vp->v_type) {
137 case VDIR:
138 case VLNK:
139 case VREG:
140 return (EROFS);
141 /* NOT REACHED */
142 default:
143 break;
144 }
145 }
146
147 file_mode = ip->inode.iso_mode;
148 file_mode &= (vp->v_type == VDIR) ? ip->i_mnt->im_dmask : ip->i_mnt->im_fmask;
149
150 uid = (ip->i_mnt->im_flags & ISOFSMNT_UID) ?
151 ip->i_mnt->im_uid : ip->inode.iso_uid;
152 gid = (ip->i_mnt->im_flags & ISOFSMNT_GID) ?
153 ip->i_mnt->im_gid : ip->inode.iso_gid;
154
155 return (vaccess(vp->v_type, file_mode, uid,
156 gid, ap->a_accmode, ap->a_cred));
157 }
158
159 static int
cd9660_open(struct vop_open_args * ap)160 cd9660_open(struct vop_open_args *ap)
161 {
162 struct vnode *vp = ap->a_vp;
163 struct iso_node *ip = VTOI(vp);
164
165 if (VN_ISDEV(vp))
166 return (EOPNOTSUPP);
167
168 vnode_create_vobject(vp, ip->i_size, ap->a_td);
169 return (0);
170 }
171
172 static int
cd9660_getattr(struct vop_getattr_args * ap)173 cd9660_getattr(struct vop_getattr_args *ap)
174
175 {
176 struct vnode *vp = ap->a_vp;
177 struct vattr *vap = ap->a_vap;
178 struct iso_node *ip = VTOI(vp);
179
180 vap->va_fsid = dev2udev(ip->i_mnt->im_dev);
181 vap->va_fileid = ip->i_number;
182
183 vap->va_mode = ip->inode.iso_mode;
184 vap->va_mode &= (vp->v_type == VDIR) ? ip->i_mnt->im_dmask : ip->i_mnt->im_fmask;
185
186 vap->va_nlink = ip->inode.iso_links;
187 vap->va_uid = (ip->i_mnt->im_flags & ISOFSMNT_UID) ?
188 ip->i_mnt->im_uid : ip->inode.iso_uid;
189 vap->va_gid = (ip->i_mnt->im_flags & ISOFSMNT_GID) ?
190 ip->i_mnt->im_gid : ip->inode.iso_gid;
191 vap->va_atime = ip->inode.iso_atime;
192 vap->va_mtime = ip->inode.iso_mtime;
193 vap->va_ctime = ip->inode.iso_ctime;
194 vap->va_birthtime = ip->inode.iso_birthtime;
195 vap->va_rdev = VN_ISDEV(vp) ? ip->inode.iso_rdev : NODEV;
196
197 vap->va_size = ip->i_size;
198 if (ip->i_size == 0 && vp->v_type == VLNK) {
199 struct vop_readlink_args rdlnk;
200 struct iovec aiov;
201 struct uio auio;
202 char *cp;
203
204 cp = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
205 aiov.iov_base = cp;
206 aiov.iov_len = MAXPATHLEN;
207 auio.uio_iov = &aiov;
208 auio.uio_iovcnt = 1;
209 auio.uio_offset = 0;
210 auio.uio_rw = UIO_READ;
211 auio.uio_segflg = UIO_SYSSPACE;
212 auio.uio_td = curthread;
213 auio.uio_resid = MAXPATHLEN;
214 rdlnk.a_uio = &auio;
215 rdlnk.a_vp = ap->a_vp;
216 rdlnk.a_cred = ap->a_cred;
217 if (cd9660_readlink(&rdlnk) == 0)
218 vap->va_size = MAXPATHLEN - auio.uio_resid;
219 free(cp, M_TEMP);
220 }
221 vap->va_flags = 0;
222 vap->va_gen = 1;
223 vap->va_blocksize = ip->i_mnt->logical_block_size;
224 vap->va_bytes = (u_quad_t) ip->i_size;
225 vap->va_type = vp->v_type;
226 vap->va_filerev = 0;
227 return (0);
228 }
229
230 /*
231 * Vnode op for ioctl.
232 */
233 static int
cd9660_ioctl(struct vop_ioctl_args * ap)234 cd9660_ioctl(struct vop_ioctl_args *ap)
235 {
236 struct vnode *vp;
237 struct iso_node *ip;
238 int error;
239
240 vp = ap->a_vp;
241 vn_lock(vp, LK_SHARED | LK_RETRY);
242 if (VN_IS_DOOMED(vp)) {
243 VOP_UNLOCK(vp);
244 return (EBADF);
245 }
246 if (VN_ISDEV(vp)) {
247 VOP_UNLOCK(vp);
248 return (EOPNOTSUPP);
249 }
250
251 ip = VTOI(vp);
252 error = 0;
253
254 switch (ap->a_command) {
255 case FIOGETLBA:
256 *(int *)(ap->a_data) = ip->iso_start;
257 break;
258 default:
259 error = ENOTTY;
260 break;
261 }
262
263 VOP_UNLOCK(vp);
264 return (error);
265 }
266
267 /*
268 * Vnode op for reading.
269 */
270 static int
cd9660_read(struct vop_read_args * ap)271 cd9660_read(struct vop_read_args *ap)
272 {
273 struct vnode *vp = ap->a_vp;
274 struct uio *uio = ap->a_uio;
275 struct iso_node *ip = VTOI(vp);
276 struct iso_mnt *imp;
277 struct buf *bp;
278 daddr_t lbn, rablock;
279 off_t diff;
280 int rasize, error = 0;
281 int seqcount;
282 long size, n, on;
283
284 if (VN_ISDEV(vp))
285 return (EOPNOTSUPP);
286
287 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
288
289 if (uio->uio_resid == 0)
290 return (0);
291 if (uio->uio_offset < 0)
292 return (EINVAL);
293 imp = ip->i_mnt;
294 do {
295 lbn = lblkno(imp, uio->uio_offset);
296 on = blkoff(imp, uio->uio_offset);
297 n = MIN(imp->logical_block_size - on, uio->uio_resid);
298 diff = (off_t)ip->i_size - uio->uio_offset;
299 if (diff <= 0)
300 return (0);
301 if (diff < n)
302 n = diff;
303 size = blksize(imp, ip, lbn);
304 rablock = lbn + 1;
305 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
306 if (lblktosize(imp, rablock) < ip->i_size)
307 error = cluster_read(vp, (off_t)ip->i_size,
308 lbn, size, NOCRED, uio->uio_resid,
309 (ap->a_ioflag >> 16), 0, &bp);
310 else
311 error = bread(vp, lbn, size, NOCRED, &bp);
312 } else {
313 if (seqcount > 1 &&
314 lblktosize(imp, rablock) < ip->i_size) {
315 rasize = blksize(imp, ip, rablock);
316 error = breadn(vp, lbn, size, &rablock,
317 &rasize, 1, NOCRED, &bp);
318 } else
319 error = bread(vp, lbn, size, NOCRED, &bp);
320 }
321 if (error != 0)
322 return (error);
323 n = MIN(n, size - bp->b_resid);
324
325 error = uiomove(bp->b_data + on, (int)n, uio);
326 brelse(bp);
327 } while (error == 0 && uio->uio_resid > 0 && n != 0);
328 return (error);
329 }
330
331 /*
332 * Structure for reading directories
333 */
334 struct isoreaddir {
335 struct dirent saveent;
336 struct dirent assocent;
337 struct dirent current;
338 off_t saveoff;
339 off_t assocoff;
340 off_t curroff;
341 struct uio *uio;
342 off_t uio_off;
343 int eofflag;
344 uint64_t *cookies;
345 int ncookies;
346 };
347
348 static int
iso_uiodir(struct isoreaddir * idp,struct dirent * dp,off_t off)349 iso_uiodir(struct isoreaddir *idp, struct dirent *dp, off_t off)
350 {
351 int error;
352
353 dp->d_reclen = GENERIC_DIRSIZ(dp);
354 dirent_terminate(dp);
355
356 if (idp->uio->uio_resid < dp->d_reclen) {
357 idp->eofflag = 0;
358 return (-1);
359 }
360
361 if (idp->cookies) {
362 if (idp->ncookies <= 0) {
363 idp->eofflag = 0;
364 return (-1);
365 }
366
367 *idp->cookies++ = off;
368 --idp->ncookies;
369 }
370
371 if ((error = uiomove(dp, dp->d_reclen, idp->uio)) != 0)
372 return (error);
373 idp->uio_off = off;
374 return (0);
375 }
376
377 static int
iso_shipdir(struct isoreaddir * idp)378 iso_shipdir(struct isoreaddir *idp)
379 {
380 struct dirent *dp;
381 int cl, sl, assoc;
382 int error;
383 char *cname, *sname;
384
385 cl = idp->current.d_namlen;
386 cname = idp->current.d_name;
387 assoc = (cl > 1) && (*cname == ASSOCCHAR);
388 if (assoc) {
389 cl--;
390 cname++;
391 }
392
393 dp = &idp->saveent;
394 sname = dp->d_name;
395 if (!(sl = dp->d_namlen)) {
396 dp = &idp->assocent;
397 sname = dp->d_name + 1;
398 sl = dp->d_namlen - 1;
399 }
400 if (sl > 0) {
401 if (sl != cl
402 || bcmp(sname,cname,sl)) {
403 if (idp->assocent.d_namlen) {
404 if ((error = iso_uiodir(idp,&idp->assocent,idp->assocoff)) != 0)
405 return (error);
406 idp->assocent.d_namlen = 0;
407 }
408 if (idp->saveent.d_namlen) {
409 if ((error = iso_uiodir(idp,&idp->saveent,idp->saveoff)) != 0)
410 return (error);
411 idp->saveent.d_namlen = 0;
412 }
413 }
414 }
415 idp->current.d_reclen = GENERIC_DIRSIZ(&idp->current);
416 if (assoc) {
417 idp->assocoff = idp->curroff;
418 memcpy(&idp->assocent, &idp->current, idp->current.d_reclen);
419 } else {
420 idp->saveoff = idp->curroff;
421 memcpy(&idp->saveent, &idp->current, idp->current.d_reclen);
422 }
423 return (0);
424 }
425
426 /*
427 * Vnode op for readdir
428 */
429 static int
cd9660_readdir(struct vop_readdir_args * ap)430 cd9660_readdir(struct vop_readdir_args *ap)
431 {
432 struct uio *uio = ap->a_uio;
433 struct isoreaddir *idp;
434 struct vnode *vdp = ap->a_vp;
435 struct iso_node *dp;
436 struct iso_mnt *imp;
437 struct buf *bp = NULL;
438 struct iso_directory_record *ep;
439 int entryoffsetinblock;
440 doff_t endsearch;
441 u_long bmask;
442 int error = 0;
443 int reclen;
444 u_short namelen;
445 u_int ncookies = 0;
446 uint64_t *cookies = NULL;
447 ino_t ino;
448
449 dp = VTOI(vdp);
450 imp = dp->i_mnt;
451 bmask = imp->im_bmask;
452
453 idp = malloc(sizeof(*idp), M_TEMP, M_WAITOK);
454 idp->saveent.d_namlen = idp->assocent.d_namlen = 0;
455 /*
456 * XXX
457 * Is it worth trying to figure out the type?
458 */
459 idp->saveent.d_type = idp->assocent.d_type = idp->current.d_type =
460 DT_UNKNOWN;
461 idp->uio = uio;
462 if (ap->a_ncookies == NULL) {
463 idp->cookies = NULL;
464 } else {
465 /*
466 * Guess the number of cookies needed.
467 */
468 ncookies = uio->uio_resid / 16;
469 cookies = malloc(ncookies * sizeof(*cookies), M_TEMP, M_WAITOK);
470 idp->cookies = cookies;
471 idp->ncookies = ncookies;
472 }
473 idp->eofflag = 1;
474 idp->curroff = uio->uio_offset;
475 idp->uio_off = uio->uio_offset;
476
477 if ((entryoffsetinblock = idp->curroff & bmask) &&
478 (error = cd9660_blkatoff(vdp, (off_t)idp->curroff, NULL, &bp))) {
479 free(idp, M_TEMP);
480 return (error);
481 }
482 endsearch = dp->i_size;
483
484 while (idp->curroff < endsearch) {
485 /*
486 * If offset is on a block boundary,
487 * read the next directory block.
488 * Release previous if it exists.
489 */
490 if ((idp->curroff & bmask) == 0) {
491 if (bp != NULL)
492 brelse(bp);
493 if ((error =
494 cd9660_blkatoff(vdp, (off_t)idp->curroff, NULL, &bp)) != 0)
495 break;
496 entryoffsetinblock = 0;
497 }
498 /*
499 * Get pointer to next entry.
500 */
501 ep = (struct iso_directory_record *)
502 ((char *)bp->b_data + entryoffsetinblock);
503
504 reclen = isonum_711(ep->length);
505 if (reclen == 0) {
506 /* skip to next block, if any */
507 idp->curroff =
508 (idp->curroff & ~bmask) + imp->logical_block_size;
509 continue;
510 }
511
512 if (reclen < ISO_DIRECTORY_RECORD_SIZE) {
513 error = EINVAL;
514 /* illegal entry, stop */
515 break;
516 }
517
518 if (entryoffsetinblock + reclen > imp->logical_block_size) {
519 error = EINVAL;
520 /* illegal directory, so stop looking */
521 break;
522 }
523
524 idp->current.d_namlen = isonum_711(ep->name_len);
525
526 if (reclen < ISO_DIRECTORY_RECORD_SIZE + idp->current.d_namlen) {
527 error = EINVAL;
528 /* illegal entry, stop */
529 break;
530 }
531
532 if (isonum_711(ep->flags)&2)
533 idp->current.d_fileno = isodirino(ep, imp);
534 else
535 idp->current.d_fileno = dbtob(bp->b_blkno) +
536 entryoffsetinblock;
537
538 idp->curroff += reclen;
539 /* NOTE: d_off is the offset of *next* entry. */
540 idp->current.d_off = idp->curroff;
541
542 switch (imp->iso_ftype) {
543 case ISO_FTYPE_RRIP:
544 ino = idp->current.d_fileno;
545 cd9660_rrip_getname(ep, idp->current.d_name, &namelen,
546 &ino, imp);
547 idp->current.d_fileno = ino;
548 idp->current.d_namlen = (u_char)namelen;
549 if (idp->current.d_namlen)
550 error = iso_uiodir(idp,&idp->current,idp->curroff);
551 break;
552 default: /* ISO_FTYPE_DEFAULT || ISO_FTYPE_9660 || ISO_FTYPE_HIGH_SIERRA*/
553 strcpy(idp->current.d_name,"..");
554 if (idp->current.d_namlen == 1 && ep->name[0] == 0) {
555 idp->current.d_namlen = 1;
556 error = iso_uiodir(idp,&idp->current,idp->curroff);
557 } else if (idp->current.d_namlen == 1 && ep->name[0] == 1) {
558 idp->current.d_namlen = 2;
559 error = iso_uiodir(idp,&idp->current,idp->curroff);
560 } else {
561 isofntrans(ep->name,idp->current.d_namlen,
562 idp->current.d_name, &namelen,
563 imp->iso_ftype == ISO_FTYPE_9660,
564 isonum_711(ep->flags)&4,
565 imp->joliet_level,
566 imp->im_flags,
567 imp->im_d2l);
568 idp->current.d_namlen = (u_char)namelen;
569 if (imp->iso_ftype == ISO_FTYPE_DEFAULT)
570 error = iso_shipdir(idp);
571 else
572 error = iso_uiodir(idp,&idp->current,idp->curroff);
573 }
574 }
575 if (error)
576 break;
577
578 entryoffsetinblock += reclen;
579 }
580
581 if (!error && imp->iso_ftype == ISO_FTYPE_DEFAULT) {
582 idp->current.d_namlen = 0;
583 error = iso_shipdir(idp);
584 }
585 if (error < 0)
586 error = 0;
587
588 if (ap->a_ncookies != NULL) {
589 if (error)
590 free(cookies, M_TEMP);
591 else {
592 /*
593 * Work out the number of cookies actually used.
594 */
595 *ap->a_ncookies = ncookies - idp->ncookies;
596 *ap->a_cookies = cookies;
597 }
598 }
599
600 if (bp)
601 brelse (bp);
602
603 uio->uio_offset = idp->uio_off;
604 *ap->a_eofflag = idp->eofflag;
605
606 free(idp, M_TEMP);
607
608 return (error);
609 }
610
611 /*
612 * Return target name of a symbolic link
613 * Shouldn't we get the parent vnode and read the data from there?
614 * This could eventually result in deadlocks in cd9660_lookup.
615 * But otherwise the block read here is in the block buffer two times.
616 */
617 typedef struct iso_directory_record ISODIR;
618 typedef struct iso_node ISONODE;
619 typedef struct iso_mnt ISOMNT;
620 static int
cd9660_readlink(struct vop_readlink_args * ap)621 cd9660_readlink(struct vop_readlink_args *ap)
622 {
623 ISONODE *ip;
624 ISODIR *dirp;
625 ISOMNT *imp;
626 struct buf *bp;
627 struct uio *uio;
628 u_short symlen;
629 int error;
630 char *symname;
631
632 ip = VTOI(ap->a_vp);
633 imp = ip->i_mnt;
634 uio = ap->a_uio;
635
636 if (imp->iso_ftype != ISO_FTYPE_RRIP)
637 return (EINVAL);
638
639 /*
640 * Get parents directory record block that this inode included.
641 */
642 error = bread(imp->im_devvp,
643 (ip->i_number >> imp->im_bshift) <<
644 (imp->im_bshift - DEV_BSHIFT),
645 imp->logical_block_size, NOCRED, &bp);
646 if (error) {
647 return (EINVAL);
648 }
649
650 /*
651 * Setup the directory pointer for this inode
652 */
653 dirp = (ISODIR *)(bp->b_data + (ip->i_number & imp->im_bmask));
654
655 /*
656 * Just make sure, we have a right one....
657 * 1: Check not cross boundary on block
658 */
659 if ((ip->i_number & imp->im_bmask) + isonum_711(dirp->length)
660 > (unsigned)imp->logical_block_size) {
661 brelse(bp);
662 return (EINVAL);
663 }
664
665 /*
666 * Now get a buffer
667 * Abuse a namei buffer for now.
668 */
669 if (uio->uio_segflg == UIO_SYSSPACE)
670 symname = uio->uio_iov->iov_base;
671 else
672 symname = uma_zalloc(namei_zone, M_WAITOK);
673
674 /*
675 * Ok, we just gathering a symbolic name in SL record.
676 */
677 if (cd9660_rrip_getsymname(dirp, symname, &symlen, imp) == 0) {
678 if (uio->uio_segflg != UIO_SYSSPACE)
679 uma_zfree(namei_zone, symname);
680 brelse(bp);
681 return (EINVAL);
682 }
683 /*
684 * Don't forget before you leave from home ;-)
685 */
686 brelse(bp);
687
688 /*
689 * return with the symbolic name to caller's.
690 */
691 if (uio->uio_segflg != UIO_SYSSPACE) {
692 error = uiomove(symname, symlen, uio);
693 uma_zfree(namei_zone, symname);
694 return (error);
695 }
696 uio->uio_resid -= symlen;
697 uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + symlen;
698 uio->uio_iov->iov_len -= symlen;
699 return (0);
700 }
701
702 /*
703 * Calculate the logical to physical mapping if not done already,
704 * then call the device strategy routine.
705 */
706 static int
cd9660_strategy(struct vop_strategy_args * ap)707 cd9660_strategy(struct vop_strategy_args *ap)
708 {
709 struct buf *bp = ap->a_bp;
710 struct vnode *vp = ap->a_vp;
711 struct iso_node *ip;
712 struct bufobj *bo;
713
714 ip = VTOI(vp);
715 if (VN_ISDEV(vp))
716 panic("cd9660_strategy: spec");
717 if (bp->b_blkno == bp->b_lblkno) {
718 bp->b_blkno = (ip->iso_start + bp->b_lblkno) <<
719 (ip->i_mnt->im_bshift - DEV_BSHIFT);
720 }
721 bp->b_iooffset = dbtob(bp->b_blkno);
722 bo = ip->i_mnt->im_bo;
723 BO_STRATEGY(bo, bp);
724 return (0);
725 }
726
727 /*
728 * Return POSIX pathconf information applicable to cd9660 filesystems.
729 */
730 static int
cd9660_pathconf(struct vop_pathconf_args * ap)731 cd9660_pathconf(struct vop_pathconf_args *ap)
732 {
733
734 switch (ap->a_name) {
735 case _PC_FILESIZEBITS:
736 *ap->a_retval = 32;
737 return (0);
738 case _PC_LINK_MAX:
739 *ap->a_retval = 1;
740 return (0);
741 case _PC_NAME_MAX:
742 if (VTOI(ap->a_vp)->i_mnt->iso_ftype == ISO_FTYPE_RRIP)
743 *ap->a_retval = NAME_MAX;
744 else
745 *ap->a_retval = 37;
746 return (0);
747 case _PC_SYMLINK_MAX:
748 if (VTOI(ap->a_vp)->i_mnt->iso_ftype == ISO_FTYPE_RRIP) {
749 *ap->a_retval = MAXPATHLEN;
750 return (0);
751 }
752 return (EINVAL);
753 case _PC_NO_TRUNC:
754 *ap->a_retval = 1;
755 return (0);
756 default:
757 return (vop_stdpathconf(ap));
758 }
759 /* NOTREACHED */
760 }
761
762 _Static_assert(sizeof(struct ifid) <= sizeof(struct fid),
763 "struct ifid must be no larger than struct fid");
764
765 /*
766 * Vnode pointer to File handle
767 */
768 static int
cd9660_vptofh(struct vop_vptofh_args * ap)769 cd9660_vptofh(struct vop_vptofh_args *ap)
770 {
771 struct ifid ifh;
772 struct iso_node *ip = VTOI(ap->a_vp);
773
774 ifh.ifid_len = sizeof(struct ifid);
775
776 ifh.ifid_ino = ip->i_number;
777 ifh.ifid_start = ip->iso_start;
778 /*
779 * This intentionally uses sizeof(ifh) in order to not copy stack
780 * garbage on ILP32.
781 */
782 memcpy(ap->a_fhp, &ifh, sizeof(ifh));
783
784 #ifdef ISOFS_DBG
785 printf("vptofh: ino %jd, start %ld\n",
786 (uintmax_t)ifh.ifid_ino, ifh.ifid_start);
787 #endif
788
789 return (0);
790 }
791
792 SYSCTL_NODE(_vfs, OID_AUTO, cd9660, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
793 "cd9660 filesystem");
794 static int use_buf_pager = 1;
795 SYSCTL_INT(_vfs_cd9660, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN,
796 &use_buf_pager, 0,
797 "Use buffer pager instead of bmap");
798
799 static daddr_t
cd9660_gbp_getblkno(struct vnode * vp,vm_ooffset_t off)800 cd9660_gbp_getblkno(struct vnode *vp, vm_ooffset_t off)
801 {
802
803 return (lblkno(VTOI(vp)->i_mnt, off));
804 }
805
806 static int
cd9660_gbp_getblksz(struct vnode * vp,daddr_t lbn,long * sz)807 cd9660_gbp_getblksz(struct vnode *vp, daddr_t lbn, long *sz)
808 {
809 struct iso_node *ip;
810
811 ip = VTOI(vp);
812 *sz = blksize(ip->i_mnt, ip, lbn);
813 return (0);
814 }
815
816 static int
cd9660_getpages(struct vop_getpages_args * ap)817 cd9660_getpages(struct vop_getpages_args *ap)
818 {
819 struct vnode *vp;
820
821 vp = ap->a_vp;
822 if (VN_ISDEV(vp))
823 return (EOPNOTSUPP);
824
825 if (use_buf_pager)
826 return (vfs_bio_getpages(vp, ap->a_m, ap->a_count,
827 ap->a_rbehind, ap->a_rahead, cd9660_gbp_getblkno,
828 cd9660_gbp_getblksz));
829 return (vnode_pager_generic_getpages(vp, ap->a_m, ap->a_count,
830 ap->a_rbehind, ap->a_rahead, NULL, NULL));
831 }
832
833 /*
834 * Global vfs data structures for cd9660
835 */
836 struct vop_vector cd9660_vnodeops = {
837 .vop_default = &default_vnodeops,
838 .vop_open = cd9660_open,
839 .vop_access = cd9660_access,
840 .vop_bmap = cd9660_bmap,
841 .vop_cachedlookup = cd9660_lookup,
842 .vop_getattr = cd9660_getattr,
843 .vop_inactive = cd9660_inactive,
844 .vop_ioctl = cd9660_ioctl,
845 .vop_lookup = vfs_cache_lookup,
846 .vop_pathconf = cd9660_pathconf,
847 .vop_read = cd9660_read,
848 .vop_readdir = cd9660_readdir,
849 .vop_readlink = cd9660_readlink,
850 .vop_reclaim = cd9660_reclaim,
851 .vop_setattr = cd9660_setattr,
852 .vop_strategy = cd9660_strategy,
853 .vop_vptofh = cd9660_vptofh,
854 .vop_getpages = cd9660_getpages,
855 };
856 VFS_VOP_VECTOR_REGISTER(cd9660_vnodeops);
857
858 /*
859 * Special device vnode ops
860 */
861
862 struct vop_vector cd9660_fifoops = {
863 .vop_default = &fifo_specops,
864 .vop_access = cd9660_access,
865 .vop_getattr = cd9660_getattr,
866 .vop_inactive = cd9660_inactive,
867 .vop_reclaim = cd9660_reclaim,
868 .vop_setattr = cd9660_setattr,
869 .vop_vptofh = cd9660_vptofh,
870 };
871 VFS_VOP_VECTOR_REGISTER(cd9660_fifoops);
872