1 /* $OpenBSD: cd9660_node.c,v 1.38 2021/10/19 06:11:45 semarie Exp $ */
2 /* $NetBSD: cd9660_node.c,v 1.17 1997/05/05 07:13:57 mycroft Exp $ */
3
4 /*-
5 * Copyright (c) 1982, 1986, 1989, 1994
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley
9 * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension
10 * Support code is derived from software contributed to Berkeley
11 * by Atsushi Murai (amurai@spec.co.jp).
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * @(#)cd9660_node.c 8.5 (Berkeley) 12/5/94
38 */
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/mount.h>
43 #include <sys/buf.h>
44 #include <sys/vnode.h>
45 #include <sys/lock.h>
46 #include <sys/namei.h>
47 #include <sys/kernel.h>
48 #include <sys/malloc.h>
49 #include <sys/stat.h>
50
51 #include <crypto/siphash.h>
52
53 #include <isofs/cd9660/iso.h>
54 #include <isofs/cd9660/cd9660_extern.h>
55 #include <isofs/cd9660/cd9660_node.h>
56
57 /*
58 * Structures associated with iso_node caching.
59 */
60 u_int cd9660_isohash(dev_t, cdino_t);
61
62 struct iso_node **isohashtbl;
63 u_long isohash;
64 SIPHASH_KEY isohashkey;
65 #define INOHASH(device, inum) cd9660_isohash((device), (inum))
66
67 extern int prtactive; /* 1 => print out reclaim of active vnodes */
68
69 static u_int cd9660_chars2ui(u_char *, int);
70
71 /*
72 * Initialize hash links for inodes and dnodes.
73 */
74 int
cd9660_init(struct vfsconf * vfsp)75 cd9660_init(struct vfsconf *vfsp)
76 {
77
78 isohashtbl = hashinit(initialvnodes, M_ISOFSMNT, M_WAITOK, &isohash);
79 arc4random_buf(&isohashkey, sizeof(isohashkey));
80 return (0);
81 }
82
83 u_int
cd9660_isohash(dev_t device,cdino_t inum)84 cd9660_isohash(dev_t device, cdino_t inum)
85 {
86 SIPHASH_CTX ctx;
87
88 SipHash24_Init(&ctx, &isohashkey);
89 SipHash24_Update(&ctx, &device, sizeof(device));
90 SipHash24_Update(&ctx, &inum, sizeof(inum));
91 return (SipHash24_End(&ctx) & isohash);
92 }
93
94 /*
95 * Use the device/inum pair to find the incore inode, and return a pointer
96 * to it. If it is in core, but locked, wait for it.
97 */
98 struct vnode *
cd9660_ihashget(dev_t dev,cdino_t inum)99 cd9660_ihashget(dev_t dev, cdino_t inum)
100 {
101 struct iso_node *ip;
102 struct vnode *vp;
103
104 loop:
105 /* XXX locking lock hash list? */
106 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
107 if (inum == ip->i_number && dev == ip->i_dev) {
108 vp = ITOV(ip);
109 /* XXX locking unlock hash list? */
110 if (vget(vp, LK_EXCLUSIVE))
111 goto loop;
112 return (vp);
113 }
114 }
115 /* XXX locking unlock hash list? */
116 return (NULL);
117 }
118
119 /*
120 * Insert the inode into the hash table, and return it locked.
121 */
122 int
cd9660_ihashins(struct iso_node * ip)123 cd9660_ihashins(struct iso_node *ip)
124 {
125 struct iso_node **ipp, *iq;
126
127 /* XXX locking lock hash list? */
128 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
129
130 for (iq = *ipp; iq; iq = iq->i_next) {
131 if (iq->i_dev == ip->i_dev &&
132 iq->i_number == ip->i_number)
133 return (EEXIST);
134 }
135
136 if ((iq = *ipp) != NULL)
137 iq->i_prev = &ip->i_next;
138 ip->i_next = iq;
139 ip->i_prev = ipp;
140 *ipp = ip;
141 /* XXX locking unlock hash list? */
142
143 VOP_LOCK(ITOV(ip), LK_EXCLUSIVE);
144
145 return (0);
146 }
147
148 /*
149 * Remove the inode from the hash table.
150 */
151 void
cd9660_ihashrem(struct iso_node * ip)152 cd9660_ihashrem(struct iso_node *ip)
153 {
154 struct iso_node *iq;
155
156 if (ip->i_prev == NULL)
157 return;
158
159 /* XXX locking lock hash list? */
160 if ((iq = ip->i_next) != NULL)
161 iq->i_prev = ip->i_prev;
162 *ip->i_prev = iq;
163 #ifdef DIAGNOSTIC
164 ip->i_next = NULL;
165 ip->i_prev = NULL;
166 #endif
167 /* XXX locking unlock hash list? */
168 }
169
170 /*
171 * Last reference to an inode, write the inode out and if necessary,
172 * truncate and deallocate the file.
173 */
174 int
cd9660_inactive(void * v)175 cd9660_inactive(void *v)
176 {
177 struct vop_inactive_args *ap = v;
178 struct vnode *vp = ap->a_vp;
179 struct iso_node *ip = VTOI(vp);
180 int error = 0;
181
182 #ifdef DIAGNOSTIC
183 if (prtactive && vp->v_usecount != 0)
184 vprint("cd9660_inactive: pushing active", vp);
185 #endif
186
187 ip->i_flag = 0;
188 VOP_UNLOCK(vp);
189 /*
190 * If we are done with the inode, reclaim it
191 * so that it can be reused immediately.
192 */
193 if (ip->inode.iso_mode == 0)
194 vrecycle(vp, ap->a_p);
195
196 return (error);
197 }
198
199 /*
200 * Reclaim an inode so that it can be used for other purposes.
201 */
202 int
cd9660_reclaim(void * v)203 cd9660_reclaim(void *v)
204 {
205 struct vop_reclaim_args *ap = v;
206 struct vnode *vp = ap->a_vp;
207 struct iso_node *ip = VTOI(vp);
208
209 #ifdef DIAGNOSTIC
210 if (prtactive && vp->v_usecount != 0)
211 vprint("cd9660_reclaim: pushing active", vp);
212 #endif
213
214 /*
215 * Remove the inode from its hash chain.
216 */
217 cd9660_ihashrem(ip);
218 /*
219 * Purge old data structures associated with the inode.
220 */
221 cache_purge(vp);
222 if (ip->i_devvp) {
223 vrele(ip->i_devvp);
224 ip->i_devvp = 0;
225 }
226 free(vp->v_data, M_ISOFSNODE, 0);
227 vp->v_data = NULL;
228 return (0);
229 }
230
231 /*
232 * File attributes
233 */
234 void
cd9660_defattr(struct iso_directory_record * isodir,struct iso_node * inop,struct buf * bp)235 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop,
236 struct buf *bp)
237 {
238 struct buf *bp2 = NULL;
239 struct iso_mnt *imp;
240 struct iso_extended_attributes *ap = NULL;
241 int off;
242
243 if (isonum_711(isodir->flags)&2) {
244 inop->inode.iso_mode = S_IFDIR;
245 /*
246 * If we return 2, fts() will assume there are no subdirectories
247 * (just links for the path and .), so instead we return 1.
248 */
249 inop->inode.iso_links = 1;
250 } else {
251 inop->inode.iso_mode = S_IFREG;
252 inop->inode.iso_links = 1;
253 }
254 if (!bp
255 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
256 && (off = isonum_711(isodir->ext_attr_length))) {
257 cd9660_bufatoff(inop, (off_t)-(off << imp->im_bshift), NULL,
258 &bp2);
259 bp = bp2;
260 }
261 if (bp) {
262 ap = (struct iso_extended_attributes *)bp->b_data;
263
264 if (isonum_711(ap->version) == 1) {
265 if (!(ap->perm[1]&0x10))
266 inop->inode.iso_mode |= S_IRUSR;
267 if (!(ap->perm[1]&0x40))
268 inop->inode.iso_mode |= S_IXUSR;
269 if (!(ap->perm[0]&0x01))
270 inop->inode.iso_mode |= S_IRGRP;
271 if (!(ap->perm[0]&0x04))
272 inop->inode.iso_mode |= S_IXGRP;
273 if (!(ap->perm[0]&0x10))
274 inop->inode.iso_mode |= S_IROTH;
275 if (!(ap->perm[0]&0x40))
276 inop->inode.iso_mode |= S_IXOTH;
277 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
278 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
279 } else
280 ap = NULL;
281 }
282 if (!ap) {
283 inop->inode.iso_mode |=
284 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
285 inop->inode.iso_uid = (uid_t)0;
286 inop->inode.iso_gid = (gid_t)0;
287 }
288 if (bp2)
289 brelse(bp2);
290 }
291
292 /*
293 * Time stamps
294 */
295 void
cd9660_deftstamp(struct iso_directory_record * isodir,struct iso_node * inop,struct buf * bp)296 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop,
297 struct buf *bp)
298 {
299 struct buf *bp2 = NULL;
300 struct iso_mnt *imp;
301 struct iso_extended_attributes *ap = NULL;
302 int off;
303
304 if (!bp
305 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
306 && (off = isonum_711(isodir->ext_attr_length))) {
307 cd9660_bufatoff(inop, (off_t)-(off << imp->im_bshift), NULL,
308 &bp2);
309 bp = bp2;
310 }
311 if (bp) {
312 ap = (struct iso_extended_attributes *)bp->b_data;
313
314 if (isonum_711(ap->version) == 1) {
315 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
316 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
317 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
318 inop->inode.iso_ctime = inop->inode.iso_atime;
319 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
320 inop->inode.iso_mtime = inop->inode.iso_ctime;
321 } else
322 ap = NULL;
323 }
324 if (!ap) {
325 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime);
326 inop->inode.iso_atime = inop->inode.iso_ctime;
327 inop->inode.iso_mtime = inop->inode.iso_ctime;
328 }
329 if (bp2)
330 brelse(bp2);
331 }
332
333 int
cd9660_tstamp_conv7(u_char * pi,struct timespec * pu)334 cd9660_tstamp_conv7(u_char *pi, struct timespec *pu)
335 {
336 int crtime, days;
337 int y, m, d, hour, minute, second;
338 signed char tz;
339
340 y = pi[0] + 1900;
341 m = pi[1];
342 d = pi[2];
343 hour = pi[3];
344 minute = pi[4];
345 second = pi[5];
346 tz = (signed char) pi[6];
347
348 if (y < 1970) {
349 pu->tv_sec = 0;
350 pu->tv_nsec = 0;
351 return (0);
352 } else {
353 #ifdef ORIGINAL
354 /* computes day number relative to Sept. 19th,1989 */
355 /* don't even *THINK* about changing formula. It works! */
356 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
357 #else
358 /*
359 * Changed :-) to make it relative to Jan. 1st, 1970
360 * and to disambiguate negative division
361 */
362 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
363 #endif
364 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
365
366 /* timezone offset is unreliable on some disks */
367 if (-48 <= tz && tz <= 52)
368 crtime -= tz * 15 * 60;
369 }
370 pu->tv_sec = crtime;
371 pu->tv_nsec = 0;
372 return (1);
373 }
374
375 static u_int
cd9660_chars2ui(u_char * begin,int len)376 cd9660_chars2ui(u_char *begin, int len)
377 {
378 u_int rc;
379
380 for (rc = 0; --len >= 0;) {
381 rc *= 10;
382 rc += *begin++ - '0';
383 }
384 return (rc);
385 }
386
387 int
cd9660_tstamp_conv17(u_char * pi,struct timespec * pu)388 cd9660_tstamp_conv17(u_char *pi, struct timespec *pu)
389 {
390 u_char buf[7];
391
392 /* year:"0001"-"9999" -> -1900 */
393 buf[0] = cd9660_chars2ui(pi,4) - 1900;
394
395 /* month: " 1"-"12" -> 1 - 12 */
396 buf[1] = cd9660_chars2ui(pi + 4,2);
397
398 /* day: " 1"-"31" -> 1 - 31 */
399 buf[2] = cd9660_chars2ui(pi + 6,2);
400
401 /* hour: " 0"-"23" -> 0 - 23 */
402 buf[3] = cd9660_chars2ui(pi + 8,2);
403
404 /* minute:" 0"-"59" -> 0 - 59 */
405 buf[4] = cd9660_chars2ui(pi + 10,2);
406
407 /* second:" 0"-"59" -> 0 - 59 */
408 buf[5] = cd9660_chars2ui(pi + 12,2);
409
410 /* difference of GMT */
411 buf[6] = pi[16];
412
413 return (cd9660_tstamp_conv7(buf,pu));
414 }
415
416 cdino_t
isodirino(struct iso_directory_record * isodir,struct iso_mnt * imp)417 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp)
418 {
419 cdino_t ino;
420
421 ino = (isonum_733(isodir->extent) +
422 isonum_711(isodir->ext_attr_length)) << imp->im_bshift;
423 return (ino);
424 }
425