1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1989, 1994, 1995
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_node.c 8.2 (Berkeley) 1/23/94
37 */
38
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
41
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/mount.h>
45 #include <sys/bio.h>
46 #include <sys/buf.h>
47 #include <sys/vnode.h>
48 #include <sys/malloc.h>
49 #include <sys/stat.h>
50 #include <sys/mutex.h>
51
52 #include <fs/cd9660/iso.h>
53 #include <fs/cd9660/cd9660_node.h>
54 #include <fs/cd9660/cd9660_mount.h>
55
56 static unsigned cd9660_chars2ui(unsigned char *begin, int len);
57
58 /*
59 * Last reference to an inode, write the inode out and if necessary,
60 * truncate and deallocate the file.
61 */
62 int
63 cd9660_inactive(ap)
64 struct vop_inactive_args /* {
65 struct vnode *a_vp;
66 struct thread *a_td;
67 } */ *ap;
68 {
69 struct vnode *vp = ap->a_vp;
70 struct iso_node *ip = VTOI(vp);
71 int error = 0;
72
73 /*
74 * If we are done with the inode, reclaim it
75 * so that it can be reused immediately.
76 */
77 if (ip->inode.iso_mode == 0)
78 vrecycle(vp);
79 return error;
80 }
81
82 /*
83 * Reclaim an inode so that it can be used for other purposes.
84 */
85 int
86 cd9660_reclaim(ap)
87 struct vop_reclaim_args /* {
88 struct vnode *a_vp;
89 struct thread *a_td;
90 } */ *ap;
91 {
92 struct vnode *vp = ap->a_vp;
93
94 /*
95 * Destroy the vm object and flush associated pages.
96 */
97 vnode_destroy_vobject(vp);
98 /*
99 * Remove the inode from its hash chain.
100 */
101 vfs_hash_remove(vp);
102
103 /*
104 * Purge old data structures associated with the inode.
105 */
106 free(vp->v_data, M_ISOFSNODE);
107 vp->v_data = NULL;
108 return (0);
109 }
110
111 /*
112 * File attributes
113 */
114 void
115 cd9660_defattr(isodir, inop, bp, ftype)
116 struct iso_directory_record *isodir;
117 struct iso_node *inop;
118 struct buf *bp;
119 enum ISO_FTYPE ftype;
120 {
121 struct buf *bp2 = NULL;
122 struct iso_mnt *imp;
123 struct iso_extended_attributes *ap = NULL;
124 int off;
125
126 /* high sierra does not have timezone data, flag is one byte ahead */
127 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
128 &isodir->date[6]: isodir->flags)&2) {
129 inop->inode.iso_mode = S_IFDIR;
130 /*
131 * If we return 2, fts() will assume there are no subdirectories
132 * (just links for the path and .), so instead we return 1.
133 */
134 inop->inode.iso_links = 1;
135 } else {
136 inop->inode.iso_mode = S_IFREG;
137 inop->inode.iso_links = 1;
138 }
139 if (!bp
140 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
141 && (off = isonum_711(isodir->ext_attr_length))) {
142 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
143 &bp2);
144 bp = bp2;
145 }
146 if (bp) {
147 ap = (struct iso_extended_attributes *)bp->b_data;
148
149 if (isonum_711(ap->version) == 1) {
150 if (!(ap->perm[0]&0x40))
151 inop->inode.iso_mode |= S_IXOTH;
152 if (!(ap->perm[0]&0x10))
153 inop->inode.iso_mode |= S_IROTH;
154 if (!(ap->perm[0]&4))
155 inop->inode.iso_mode |= S_IXGRP;
156 if (!(ap->perm[0]&1))
157 inop->inode.iso_mode |= S_IRGRP;
158 if (!(ap->perm[1]&0x40))
159 inop->inode.iso_mode |= S_IXUSR;
160 if (!(ap->perm[1]&0x10))
161 inop->inode.iso_mode |= S_IRUSR;
162 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
163 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
164 } else
165 ap = NULL;
166 }
167 if (!ap) {
168 inop->inode.iso_mode |= S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
169 inop->inode.iso_uid = (uid_t)0;
170 inop->inode.iso_gid = (gid_t)0;
171 }
172 if (bp2)
173 brelse(bp2);
174 }
175
176 /*
177 * Time stamps
178 */
179 void
180 cd9660_deftstamp(isodir,inop,bp,ftype)
181 struct iso_directory_record *isodir;
182 struct iso_node *inop;
183 struct buf *bp;
184 enum ISO_FTYPE ftype;
185 {
186 struct buf *bp2 = NULL;
187 struct iso_mnt *imp;
188 struct iso_extended_attributes *ap = NULL;
189 int off;
190
191 if (!bp
192 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
193 && (off = isonum_711(isodir->ext_attr_length))) {
194 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
195 &bp2);
196 bp = bp2;
197 }
198 if (bp) {
199 ap = (struct iso_extended_attributes *)bp->b_data;
200
201 if (ftype != ISO_FTYPE_HIGH_SIERRA
202 && isonum_711(ap->version) == 1) {
203 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
204 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
205 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
206 inop->inode.iso_ctime = inop->inode.iso_atime;
207 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
208 inop->inode.iso_mtime = inop->inode.iso_ctime;
209 } else
210 ap = NULL;
211 }
212 if (!ap) {
213 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
214 inop->inode.iso_atime = inop->inode.iso_ctime;
215 inop->inode.iso_mtime = inop->inode.iso_ctime;
216 }
217 if (bp2)
218 brelse(bp2);
219 }
220
221 int
222 cd9660_tstamp_conv7(pi,pu,ftype)
223 u_char *pi;
224 struct timespec *pu;
225 enum ISO_FTYPE ftype;
226 {
227 int crtime, days;
228 int y, m, d, hour, minute, second, tz;
229
230 y = pi[0] + 1900;
231 m = pi[1];
232 d = pi[2];
233 hour = pi[3];
234 minute = pi[4];
235 second = pi[5];
236 if(ftype != ISO_FTYPE_HIGH_SIERRA)
237 tz = ((signed char *)pi)[6]; /* Timezone value is signed. */
238 else
239 /* original high sierra misses timezone data */
240 tz = 0;
241
242 if (y < 1970) {
243 pu->tv_sec = 0;
244 pu->tv_nsec = 0;
245 return 0;
246 } else {
247 #ifdef ORIGINAL
248 /* computes day number relative to Sept. 19th,1989 */
249 /* don't even *THINK* about changing formula. It works! */
250 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
251 #else
252 /*
253 * Changed :-) to make it relative to Jan. 1st, 1970
254 * and to disambiguate negative division
255 */
256 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
257 #endif
258 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
259
260 /* timezone offset is unreliable on some disks */
261 if (-48 <= tz && tz <= 52)
262 crtime -= tz * 15 * 60;
263 }
264 pu->tv_sec = crtime;
265 pu->tv_nsec = 0;
266 return 1;
267 }
268
269 static u_int
270 cd9660_chars2ui(begin,len)
271 u_char *begin;
272 int len;
273 {
274 u_int rc;
275
276 for (rc = 0; --len >= 0;) {
277 rc *= 10;
278 rc += *begin++ - '';
279 }
280 return rc;
281 }
282
283 int
284 cd9660_tstamp_conv17(pi,pu)
285 u_char *pi;
286 struct timespec *pu;
287 {
288 u_char buf[7];
289
290 /* year:"0001"-"9999" -> -1900 */
291 buf[0] = cd9660_chars2ui(pi,4) - 1900;
292
293 /* month: " 1"-"12" -> 1 - 12 */
294 buf[1] = cd9660_chars2ui(pi + 4,2);
295
296 /* day: " 1"-"31" -> 1 - 31 */
297 buf[2] = cd9660_chars2ui(pi + 6,2);
298
299 /* hour: " 0"-"23" -> 0 - 23 */
300 buf[3] = cd9660_chars2ui(pi + 8,2);
301
302 /* minute:" 0"-"59" -> 0 - 59 */
303 buf[4] = cd9660_chars2ui(pi + 10,2);
304
305 /* second:" 0"-"59" -> 0 - 59 */
306 buf[5] = cd9660_chars2ui(pi + 12,2);
307
308 /* difference of GMT */
309 buf[6] = pi[16];
310
311 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
312 }
313
314 cd_ino_t
315 isodirino(isodir, imp)
316 struct iso_directory_record *isodir;
317 struct iso_mnt *imp;
318 {
319 cd_ino_t ino;
320
321 /*
322 * Note there is an inverse calculation in
323 * cd9660_vfsops.c:cd9660_vget_internal():
324 * ip->iso_start = ino >> imp->im_bshift;
325 * and also a calculation of the isodir pointer
326 * from an inode in cd9660_vnops.c:cd9660_readlink()
327 */
328 ino = ((cd_ino_t)isonum_733(isodir->extent) +
329 isonum_711(isodir->ext_attr_length)) << imp->im_bshift;
330 return ino;
331 }
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