1 /* $NetBSD: cd9660_node.c,v 1.38 2017/05/26 14:34:19 riastradh Exp $ */
2
3 /*-
4 * Copyright (c) 1982, 1986, 1989, 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_node.c 8.8 (Berkeley) 5/22/95
37 */
38
39 #include <sys/cdefs.h>
40 __KERNEL_RCSID(0, "$NetBSD: cd9660_node.c,v 1.38 2017/05/26 14:34:19 riastradh Exp $");
41
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/mount.h>
45 #include <sys/proc.h>
46 #include <sys/file.h>
47 #include <sys/buf.h>
48 #include <sys/vnode.h>
49 #include <sys/namei.h>
50 #include <sys/kernel.h>
51 #include <sys/pool.h>
52 #include <sys/stat.h>
53
54 #include <fs/cd9660/iso.h>
55 #include <fs/cd9660/cd9660_extern.h>
56 #include <fs/cd9660/cd9660_node.h>
57 #include <fs/cd9660/cd9660_mount.h>
58 #include <fs/cd9660/iso_rrip.h>
59
60 struct pool cd9660_node_pool;
61
62 static u_int cd9660_chars2ui(const u_char *, int);
63
64 /*
65 * Initialize pool for nodes.
66 */
67 void
cd9660_init(void)68 cd9660_init(void)
69 {
70
71 malloc_type_attach(M_ISOFSMNT);
72 pool_init(&cd9660_node_pool, sizeof(struct iso_node), 0, 0, 0,
73 "cd9660nopl", &pool_allocator_nointr, IPL_NONE);
74 }
75
76 /*
77 * Reinitialize.
78 */
79
80 void
cd9660_reinit(void)81 cd9660_reinit(void)
82 {
83
84 }
85
86 /*
87 * Destroy node pool.
88 */
89 void
cd9660_done(void)90 cd9660_done(void)
91 {
92 pool_destroy(&cd9660_node_pool);
93 malloc_type_detach(M_ISOFSMNT);
94 }
95
96 /*
97 * Last reference to an inode, write the inode out and if necessary,
98 * truncate and deallocate the file.
99 */
100 int
cd9660_inactive(void * v)101 cd9660_inactive(void *v)
102 {
103 struct vop_inactive_v2_args /* {
104 struct vnode *a_vp;
105 bool *a_recycle;
106 } */ *ap = v;
107 struct vnode *vp = ap->a_vp;
108 struct iso_node *ip = VTOI(vp);
109 int error = 0;
110
111 /*
112 * If we are done with the inode, reclaim it
113 * so that it can be reused immediately.
114 */
115 ip->i_flag = 0;
116 *ap->a_recycle = (ip->inode.iso_mode == 0);
117 return error;
118 }
119
120 /*
121 * Reclaim an inode so that it can be used for other purposes.
122 */
123 int
cd9660_reclaim(void * v)124 cd9660_reclaim(void *v)
125 {
126 struct vop_reclaim_v2_args /* {
127 struct vnode *a_vp;
128 struct lwp *a_l;
129 } */ *ap = v;
130 struct vnode *vp = ap->a_vp;
131
132 VOP_UNLOCK(vp);
133
134 /*
135 * Purge old data structures associated with the inode.
136 */
137 genfs_node_destroy(vp);
138 pool_put(&cd9660_node_pool, vp->v_data);
139 vp->v_data = NULL;
140 return (0);
141 }
142
143 /*
144 * File attributes
145 */
146 void
cd9660_defattr(struct iso_directory_record * isodir,struct iso_node * inop,struct buf * bp)147 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop,
148 struct buf *bp)
149 {
150 struct buf *bp2 = NULL;
151 struct iso_mnt *imp;
152 struct iso_extended_attributes *ap = NULL;
153 int off;
154
155 if (isonum_711(isodir->flags)&2) {
156 inop->inode.iso_mode = S_IFDIR;
157 /*
158 * If we return 2, fts() will assume there are no subdirectories
159 * (just links for the path and .), so instead we return 1.
160 */
161 inop->inode.iso_links = 1;
162 } else {
163 inop->inode.iso_mode = S_IFREG;
164 inop->inode.iso_links = 1;
165 }
166 if (!bp
167 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
168 && (off = isonum_711(isodir->ext_attr_length))) {
169 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift),
170 NULL, &bp2);
171 bp = bp2;
172 }
173 if (bp) {
174 ap = (struct iso_extended_attributes *)bp->b_data;
175
176 if (isonum_711(ap->version) == 1) {
177 if (!(ap->perm[1]&0x10))
178 inop->inode.iso_mode |= S_IRUSR;
179 if (!(ap->perm[1]&0x40))
180 inop->inode.iso_mode |= S_IXUSR;
181 if (!(ap->perm[0]&0x01))
182 inop->inode.iso_mode |= S_IRGRP;
183 if (!(ap->perm[0]&0x04))
184 inop->inode.iso_mode |= S_IXGRP;
185 if (!(ap->perm[0]&0x10))
186 inop->inode.iso_mode |= S_IROTH;
187 if (!(ap->perm[0]&0x40))
188 inop->inode.iso_mode |= S_IXOTH;
189 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
190 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
191 } else
192 ap = NULL;
193 }
194 if (!ap) {
195 inop->inode.iso_mode |=
196 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
197 inop->inode.iso_uid = (uid_t)0;
198 inop->inode.iso_gid = (gid_t)0;
199 }
200 if (bp2)
201 brelse(bp2, 0);
202 }
203
204 /*
205 * Time stamps
206 */
207 void
cd9660_deftstamp(struct iso_directory_record * isodir,struct iso_node * inop,struct buf * bp)208 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop,
209 struct buf *bp)
210 {
211 struct buf *bp2 = NULL;
212 struct iso_mnt *imp;
213 struct iso_extended_attributes *ap = NULL;
214 int off;
215
216 if (!bp
217 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
218 && (off = isonum_711(isodir->ext_attr_length))) {
219 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift),
220 NULL, &bp2);
221 bp = bp2;
222 }
223 if (bp) {
224 ap = (struct iso_extended_attributes *)bp->b_data;
225
226 if (isonum_711(ap->version) == 1) {
227 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
228 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
229 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
230 inop->inode.iso_ctime = inop->inode.iso_atime;
231 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
232 inop->inode.iso_mtime = inop->inode.iso_ctime;
233 } else
234 ap = NULL;
235 }
236 if (!ap) {
237 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime);
238 inop->inode.iso_atime = inop->inode.iso_ctime;
239 inop->inode.iso_mtime = inop->inode.iso_ctime;
240 }
241 if (bp2)
242 brelse(bp2, 0);
243 }
244
245 int
cd9660_tstamp_conv7(const u_char * pi,struct timespec * pu)246 cd9660_tstamp_conv7(const u_char *pi, struct timespec *pu)
247 {
248 int crtime, days;
249 int y, m, d, hour, minute, second, tz;
250
251 y = pi[0] + 1900;
252 m = pi[1];
253 d = pi[2];
254 hour = pi[3];
255 minute = pi[4];
256 second = pi[5];
257 tz = pi[6];
258
259 if (y < 1970) {
260 pu->tv_sec = 0;
261 pu->tv_nsec = 0;
262 return 0;
263 } else {
264 #ifdef ORIGINAL
265 /* computes day number relative to Sept. 19th,1989 */
266 /* don't even *THINK* about changing formula. It works! */
267 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
268 #else
269 /*
270 * Changed :-) to make it relative to Jan. 1st, 1970
271 * and to disambiguate negative division
272 */
273 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
274 #endif
275 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
276
277 /* timezone offset is unreliable on some disks */
278 if (-48 <= tz && tz <= 52)
279 crtime -= tz * 15 * 60;
280 }
281 pu->tv_sec = crtime;
282 pu->tv_nsec = 0;
283 return 1;
284 }
285
286 static u_int
cd9660_chars2ui(const u_char * begin,int len)287 cd9660_chars2ui(const u_char *begin, int len)
288 {
289 u_int rc;
290
291 for (rc = 0; --len >= 0;) {
292 rc *= 10;
293 rc += *begin++ - '0';
294 }
295 return rc;
296 }
297
298 int
cd9660_tstamp_conv17(const u_char * pi,struct timespec * pu)299 cd9660_tstamp_conv17(const u_char *pi, struct timespec *pu)
300 {
301 u_char tbuf[7];
302
303 /* year:"0001"-"9999" -> -1900 */
304 tbuf[0] = cd9660_chars2ui(pi,4) - 1900;
305
306 /* month: " 1"-"12" -> 1 - 12 */
307 tbuf[1] = cd9660_chars2ui(pi + 4,2);
308
309 /* day: " 1"-"31" -> 1 - 31 */
310 tbuf[2] = cd9660_chars2ui(pi + 6,2);
311
312 /* hour: " 0"-"23" -> 0 - 23 */
313 tbuf[3] = cd9660_chars2ui(pi + 8,2);
314
315 /* minute:" 0"-"59" -> 0 - 59 */
316 tbuf[4] = cd9660_chars2ui(pi + 10,2);
317
318 /* second:" 0"-"59" -> 0 - 59 */
319 tbuf[5] = cd9660_chars2ui(pi + 12,2);
320
321 /* difference of GMT */
322 tbuf[6] = pi[16];
323
324 return cd9660_tstamp_conv7(tbuf,pu);
325 }
326
327 ino_t
isodirino(struct iso_directory_record * isodir,struct iso_mnt * imp)328 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp)
329 {
330 ino_t ino;
331
332 /*
333 * Note there is an inverse calculation in
334 * cd9660_vfsops.c:cd9660_loadvnode():
335 * ip->iso_start = ino >> imp->im_bshift;
336 * and also a calculation of the isodir pointer
337 * from an inode in cd9660_vnops.c:cd9660_readlink()
338 */
339 ino = ((ino_t)isonum_733(isodir->extent) +
340 isonum_711(isodir->ext_attr_length)) << imp->im_bshift;
341 return ino;
342 }
343