1 /*-
2 * Copyright (c) 1982, 1986, 1989, 1994, 1995
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 * 4. 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_node.c 8.2 (Berkeley) 1/23/94
35 */
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD: releng/9.0/sys/fs/cd9660/cd9660_node.c 215548 2010-11-19 21:17:34Z kib $");
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/mount.h>
43 #include <sys/bio.h>
44 #include <sys/buf.h>
45 #include <sys/vnode.h>
46 #include <sys/malloc.h>
47 #include <sys/stat.h>
48 #include <sys/mutex.h>
49
50 #include <fs/cd9660/iso.h>
51 #include <fs/cd9660/cd9660_node.h>
52 #include <fs/cd9660/cd9660_mount.h>
53
54 static unsigned cd9660_chars2ui(unsigned char *begin, int len);
55
56 /*
57 * Last reference to an inode, write the inode out and if necessary,
58 * truncate and deallocate the file.
59 */
60 int
61 cd9660_inactive(ap)
62 struct vop_inactive_args /* {
63 struct vnode *a_vp;
64 struct thread *a_td;
65 } */ *ap;
66 {
67 struct vnode *vp = ap->a_vp;
68 struct thread *td = ap->a_td;
69 struct iso_node *ip = VTOI(vp);
70 int error = 0;
71
72 /*
73 * If we are done with the inode, reclaim it
74 * so that it can be reused immediately.
75 */
76 if (ip->inode.iso_mode == 0)
77 vrecycle(vp, td);
78 return error;
79 }
80
81 /*
82 * Reclaim an inode so that it can be used for other purposes.
83 */
84 int
85 cd9660_reclaim(ap)
86 struct vop_reclaim_args /* {
87 struct vnode *a_vp;
88 struct thread *a_td;
89 } */ *ap;
90 {
91 struct vnode *vp = ap->a_vp;
92
93 /*
94 * Destroy the vm object and flush associated pages.
95 */
96 vnode_destroy_vobject(vp);
97 /*
98 * Remove the inode from its hash chain.
99 */
100 vfs_hash_remove(vp);
101
102 /*
103 * Purge old data structures associated with the inode.
104 */
105 free(vp->v_data, M_ISOFSNODE);
106 vp->v_data = NULL;
107 return (0);
108 }
109
110 /*
111 * File attributes
112 */
113 void
114 cd9660_defattr(isodir, inop, bp, ftype)
115 struct iso_directory_record *isodir;
116 struct iso_node *inop;
117 struct buf *bp;
118 enum ISO_FTYPE ftype;
119 {
120 struct buf *bp2 = NULL;
121 struct iso_mnt *imp;
122 struct iso_extended_attributes *ap = NULL;
123 int off;
124
125 /* high sierra does not have timezone data, flag is one byte ahead */
126 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
127 &isodir->date[6]: isodir->flags)&2) {
128 inop->inode.iso_mode = S_IFDIR;
129 /*
130 * If we return 2, fts() will assume there are no subdirectories
131 * (just links for the path and .), so instead we return 1.
132 */
133 inop->inode.iso_links = 1;
134 } else {
135 inop->inode.iso_mode = S_IFREG;
136 inop->inode.iso_links = 1;
137 }
138 if (!bp
139 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
140 && (off = isonum_711(isodir->ext_attr_length))) {
141 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
142 &bp2);
143 bp = bp2;
144 }
145 if (bp) {
146 ap = (struct iso_extended_attributes *)bp->b_data;
147
148 if (isonum_711(ap->version) == 1) {
149 if (!(ap->perm[0]&0x40))
150 inop->inode.iso_mode |= S_IXOTH;
151 if (!(ap->perm[0]&0x10))
152 inop->inode.iso_mode |= S_IROTH;
153 if (!(ap->perm[0]&4))
154 inop->inode.iso_mode |= S_IXGRP;
155 if (!(ap->perm[0]&1))
156 inop->inode.iso_mode |= S_IRGRP;
157 if (!(ap->perm[1]&0x40))
158 inop->inode.iso_mode |= S_IXUSR;
159 if (!(ap->perm[1]&0x10))
160 inop->inode.iso_mode |= S_IRUSR;
161 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
162 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
163 } else
164 ap = NULL;
165 }
166 if (!ap) {
167 inop->inode.iso_mode |= S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
168 inop->inode.iso_uid = (uid_t)0;
169 inop->inode.iso_gid = (gid_t)0;
170 }
171 if (bp2)
172 brelse(bp2);
173 }
174
175 /*
176 * Time stamps
177 */
178 void
179 cd9660_deftstamp(isodir,inop,bp,ftype)
180 struct iso_directory_record *isodir;
181 struct iso_node *inop;
182 struct buf *bp;
183 enum ISO_FTYPE ftype;
184 {
185 struct buf *bp2 = NULL;
186 struct iso_mnt *imp;
187 struct iso_extended_attributes *ap = NULL;
188 int off;
189
190 if (!bp
191 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
192 && (off = isonum_711(isodir->ext_attr_length))) {
193 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
194 &bp2);
195 bp = bp2;
196 }
197 if (bp) {
198 ap = (struct iso_extended_attributes *)bp->b_data;
199
200 if (ftype != ISO_FTYPE_HIGH_SIERRA
201 && isonum_711(ap->version) == 1) {
202 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
203 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
204 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
205 inop->inode.iso_ctime = inop->inode.iso_atime;
206 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
207 inop->inode.iso_mtime = inop->inode.iso_ctime;
208 } else
209 ap = NULL;
210 }
211 if (!ap) {
212 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
213 inop->inode.iso_atime = inop->inode.iso_ctime;
214 inop->inode.iso_mtime = inop->inode.iso_ctime;
215 }
216 if (bp2)
217 brelse(bp2);
218 }
219
220 int
221 cd9660_tstamp_conv7(pi,pu,ftype)
222 u_char *pi;
223 struct timespec *pu;
224 enum ISO_FTYPE ftype;
225 {
226 int crtime, days;
227 int y, m, d, hour, minute, second, tz;
228
229 y = pi[0] + 1900;
230 m = pi[1];
231 d = pi[2];
232 hour = pi[3];
233 minute = pi[4];
234 second = pi[5];
235 if(ftype != ISO_FTYPE_HIGH_SIERRA)
236 tz = ((signed char *)pi)[6]; /* Timezone value is signed. */
237 else
238 /* original high sierra misses timezone data */
239 tz = 0;
240
241 if (y < 1970) {
242 pu->tv_sec = 0;
243 pu->tv_nsec = 0;
244 return 0;
245 } else {
246 #ifdef ORIGINAL
247 /* computes day number relative to Sept. 19th,1989 */
248 /* don't even *THINK* about changing formula. It works! */
249 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
250 #else
251 /*
252 * Changed :-) to make it relative to Jan. 1st, 1970
253 * and to disambiguate negative division
254 */
255 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
256 #endif
257 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
258
259 /* timezone offset is unreliable on some disks */
260 if (-48 <= tz && tz <= 52)
261 crtime -= tz * 15 * 60;
262 }
263 pu->tv_sec = crtime;
264 pu->tv_nsec = 0;
265 return 1;
266 }
267
268 static u_int
269 cd9660_chars2ui(begin,len)
270 u_char *begin;
271 int len;
272 {
273 u_int rc;
274
275 for (rc = 0; --len >= 0;) {
276 rc *= 10;
277 rc += *begin++ - '';
278 }
279 return rc;
280 }
281
282 int
283 cd9660_tstamp_conv17(pi,pu)
284 u_char *pi;
285 struct timespec *pu;
286 {
287 u_char buf[7];
288
289 /* year:"0001"-"9999" -> -1900 */
290 buf[0] = cd9660_chars2ui(pi,4) - 1900;
291
292 /* month: " 1"-"12" -> 1 - 12 */
293 buf[1] = cd9660_chars2ui(pi + 4,2);
294
295 /* day: " 1"-"31" -> 1 - 31 */
296 buf[2] = cd9660_chars2ui(pi + 6,2);
297
298 /* hour: " 0"-"23" -> 0 - 23 */
299 buf[3] = cd9660_chars2ui(pi + 8,2);
300
301 /* minute:" 0"-"59" -> 0 - 59 */
302 buf[4] = cd9660_chars2ui(pi + 10,2);
303
304 /* second:" 0"-"59" -> 0 - 59 */
305 buf[5] = cd9660_chars2ui(pi + 12,2);
306
307 /* difference of GMT */
308 buf[6] = pi[16];
309
310 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
311 }
312
313 ino_t
314 isodirino(isodir, imp)
315 struct iso_directory_record *isodir;
316 struct iso_mnt *imp;
317 {
318 ino_t ino;
319
320 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length))
321 << imp->im_bshift;
322 return (ino);
323 }
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