1 /* $NetBSD: cd9660_node.c,v 1.34 2014/11/10 18:46:33 maxv 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 1.34 2014/11/10 18:46:33 maxv 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 extern int prtactive; /* 1 => print out reclaim of active vnodes */
61
62 struct pool cd9660_node_pool;
63
64 static u_int cd9660_chars2ui(const u_char *, int);
65
66 /*
67 * Initialize pool for nodes.
68 */
69 void
cd9660_init(void)70 cd9660_init(void)
71 {
72
73 malloc_type_attach(M_ISOFSMNT);
74 pool_init(&cd9660_node_pool, sizeof(struct iso_node), 0, 0, 0,
75 "cd9660nopl", &pool_allocator_nointr, IPL_NONE);
76 }
77
78 /*
79 * Reinitialize.
80 */
81
82 void
cd9660_reinit(void)83 cd9660_reinit(void)
84 {
85
86 }
87
88 /*
89 * Destroy node pool.
90 */
91 void
cd9660_done(void)92 cd9660_done(void)
93 {
94 pool_destroy(&cd9660_node_pool);
95 malloc_type_detach(M_ISOFSMNT);
96 }
97
98 /*
99 * Last reference to an inode, write the inode out and if necessary,
100 * truncate and deallocate the file.
101 */
102 int
cd9660_inactive(void * v)103 cd9660_inactive(void *v)
104 {
105 struct vop_inactive_args /* {
106 struct vnode *a_vp;
107 bool *a_recycle;
108 } */ *ap = v;
109 struct vnode *vp = ap->a_vp;
110 struct iso_node *ip = VTOI(vp);
111 int error = 0;
112
113 /*
114 * If we are done with the inode, reclaim it
115 * so that it can be reused immediately.
116 */
117 ip->i_flag = 0;
118 *ap->a_recycle = (ip->inode.iso_mode == 0);
119 VOP_UNLOCK(vp);
120 return error;
121 }
122
123 /*
124 * Reclaim an inode so that it can be used for other purposes.
125 */
126 int
cd9660_reclaim(void * v)127 cd9660_reclaim(void *v)
128 {
129 struct vop_reclaim_args /* {
130 struct vnode *a_vp;
131 struct lwp *a_l;
132 } */ *ap = v;
133 struct vnode *vp = ap->a_vp;
134 struct iso_node *ip = VTOI(vp);
135
136 if (prtactive && vp->v_usecount > 1)
137 vprint("cd9660_reclaim: pushing active", vp);
138 /*
139 * Remove the inode from the vnode cache.
140 */
141 vcache_remove(vp->v_mount, &ip->i_number, sizeof(ip->i_number));
142 /*
143 * Purge old data structures associated with the inode.
144 */
145 genfs_node_destroy(vp);
146 pool_put(&cd9660_node_pool, vp->v_data);
147 vp->v_data = NULL;
148 return (0);
149 }
150
151 /*
152 * File attributes
153 */
154 void
cd9660_defattr(struct iso_directory_record * isodir,struct iso_node * inop,struct buf * bp)155 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop,
156 struct buf *bp)
157 {
158 struct buf *bp2 = NULL;
159 struct iso_mnt *imp;
160 struct iso_extended_attributes *ap = NULL;
161 int off;
162
163 if (isonum_711(isodir->flags)&2) {
164 inop->inode.iso_mode = S_IFDIR;
165 /*
166 * If we return 2, fts() will assume there are no subdirectories
167 * (just links for the path and .), so instead we return 1.
168 */
169 inop->inode.iso_links = 1;
170 } else {
171 inop->inode.iso_mode = S_IFREG;
172 inop->inode.iso_links = 1;
173 }
174 if (!bp
175 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
176 && (off = isonum_711(isodir->ext_attr_length))) {
177 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift),
178 NULL, &bp2);
179 bp = bp2;
180 }
181 if (bp) {
182 ap = (struct iso_extended_attributes *)bp->b_data;
183
184 if (isonum_711(ap->version) == 1) {
185 if (!(ap->perm[1]&0x10))
186 inop->inode.iso_mode |= S_IRUSR;
187 if (!(ap->perm[1]&0x40))
188 inop->inode.iso_mode |= S_IXUSR;
189 if (!(ap->perm[0]&0x01))
190 inop->inode.iso_mode |= S_IRGRP;
191 if (!(ap->perm[0]&0x04))
192 inop->inode.iso_mode |= S_IXGRP;
193 if (!(ap->perm[0]&0x10))
194 inop->inode.iso_mode |= S_IROTH;
195 if (!(ap->perm[0]&0x40))
196 inop->inode.iso_mode |= S_IXOTH;
197 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
198 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
199 } else
200 ap = NULL;
201 }
202 if (!ap) {
203 inop->inode.iso_mode |=
204 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
205 inop->inode.iso_uid = (uid_t)0;
206 inop->inode.iso_gid = (gid_t)0;
207 }
208 if (bp2)
209 brelse(bp2, 0);
210 }
211
212 /*
213 * Time stamps
214 */
215 void
cd9660_deftstamp(struct iso_directory_record * isodir,struct iso_node * inop,struct buf * bp)216 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop,
217 struct buf *bp)
218 {
219 struct buf *bp2 = NULL;
220 struct iso_mnt *imp;
221 struct iso_extended_attributes *ap = NULL;
222 int off;
223
224 if (!bp
225 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
226 && (off = isonum_711(isodir->ext_attr_length))) {
227 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift),
228 NULL, &bp2);
229 bp = bp2;
230 }
231 if (bp) {
232 ap = (struct iso_extended_attributes *)bp->b_data;
233
234 if (isonum_711(ap->version) == 1) {
235 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
236 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
237 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
238 inop->inode.iso_ctime = inop->inode.iso_atime;
239 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
240 inop->inode.iso_mtime = inop->inode.iso_ctime;
241 } else
242 ap = NULL;
243 }
244 if (!ap) {
245 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime);
246 inop->inode.iso_atime = inop->inode.iso_ctime;
247 inop->inode.iso_mtime = inop->inode.iso_ctime;
248 }
249 if (bp2)
250 brelse(bp2, 0);
251 }
252
253 int
cd9660_tstamp_conv7(const u_char * pi,struct timespec * pu)254 cd9660_tstamp_conv7(const u_char *pi, struct timespec *pu)
255 {
256 int crtime, days;
257 int y, m, d, hour, minute, second, tz;
258
259 y = pi[0] + 1900;
260 m = pi[1];
261 d = pi[2];
262 hour = pi[3];
263 minute = pi[4];
264 second = pi[5];
265 tz = pi[6];
266
267 if (y < 1970) {
268 pu->tv_sec = 0;
269 pu->tv_nsec = 0;
270 return 0;
271 } else {
272 #ifdef ORIGINAL
273 /* computes day number relative to Sept. 19th,1989 */
274 /* don't even *THINK* about changing formula. It works! */
275 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
276 #else
277 /*
278 * Changed :-) to make it relative to Jan. 1st, 1970
279 * and to disambiguate negative division
280 */
281 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
282 #endif
283 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
284
285 /* timezone offset is unreliable on some disks */
286 if (-48 <= tz && tz <= 52)
287 crtime -= tz * 15 * 60;
288 }
289 pu->tv_sec = crtime;
290 pu->tv_nsec = 0;
291 return 1;
292 }
293
294 static u_int
cd9660_chars2ui(const u_char * begin,int len)295 cd9660_chars2ui(const u_char *begin, int len)
296 {
297 u_int rc;
298
299 for (rc = 0; --len >= 0;) {
300 rc *= 10;
301 rc += *begin++ - '0';
302 }
303 return rc;
304 }
305
306 int
cd9660_tstamp_conv17(const u_char * pi,struct timespec * pu)307 cd9660_tstamp_conv17(const u_char *pi, struct timespec *pu)
308 {
309 u_char tbuf[7];
310
311 /* year:"0001"-"9999" -> -1900 */
312 tbuf[0] = cd9660_chars2ui(pi,4) - 1900;
313
314 /* month: " 1"-"12" -> 1 - 12 */
315 tbuf[1] = cd9660_chars2ui(pi + 4,2);
316
317 /* day: " 1"-"31" -> 1 - 31 */
318 tbuf[2] = cd9660_chars2ui(pi + 6,2);
319
320 /* hour: " 0"-"23" -> 0 - 23 */
321 tbuf[3] = cd9660_chars2ui(pi + 8,2);
322
323 /* minute:" 0"-"59" -> 0 - 59 */
324 tbuf[4] = cd9660_chars2ui(pi + 10,2);
325
326 /* second:" 0"-"59" -> 0 - 59 */
327 tbuf[5] = cd9660_chars2ui(pi + 12,2);
328
329 /* difference of GMT */
330 tbuf[6] = pi[16];
331
332 return cd9660_tstamp_conv7(tbuf,pu);
333 }
334
335 ino_t
isodirino(struct iso_directory_record * isodir,struct iso_mnt * imp)336 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp)
337 {
338 ino_t ino;
339
340 /*
341 * Note there is an inverse calculation in
342 * cd9660_vfsops.c:cd9660_loadvnode():
343 * ip->iso_start = ino >> imp->im_bshift;
344 * and also a calculation of the isodir pointer
345 * from an inode in cd9660_vnops.c:cd9660_readlink()
346 */
347 ino = ((ino_t)isonum_733(isodir->extent) +
348 isonum_711(isodir->ext_attr_length)) << imp->im_bshift;
349 return ino;
350 }
351