1/* $NetBSD: cd9660_node.c,v 1.35 2016/08/20 12:37:06 hannken 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 1.35 2016/08/20 12:37:06 hannken 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
60extern int prtactive; /* 1 => print out reclaim of active vnodes */
61
62struct pool cd9660_node_pool;
63
64static u_int cd9660_chars2ui(const u_char *, int);
65
66/*
67 * Initialize pool for nodes.
68 */
69void
70cd9660_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
82void
83cd9660_reinit(void)
84{
85
86}
87
88/*
89 * Destroy node pool.
90 */
91void
92cd9660_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 */
102int
103cd9660_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 */
126int
127cd9660_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
135 if (prtactive && vp->v_usecount > 1)
136 vprint("cd9660_reclaim: pushing active", vp);
137 /*
138 * Purge old data structures associated with the inode.
139 */
140 genfs_node_destroy(vp);
141 pool_put(&cd9660_node_pool, vp->v_data);
142 vp->v_data = NULL;
143 return (0);
144}
145
146/*
147 * File attributes
148 */
149void
150cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop,
151 struct buf *bp)
152{
153 struct buf *bp2 = NULL;
154 struct iso_mnt *imp;
155 struct iso_extended_attributes *ap = NULL;
156 int off;
157
158 if (isonum_711(isodir->flags)&2) {
159 inop->inode.iso_mode = S_IFDIR;
160 /*
161 * If we return 2, fts() will assume there are no subdirectories
162 * (just links for the path and .), so instead we return 1.
163 */
164 inop->inode.iso_links = 1;
165 } else {
166 inop->inode.iso_mode = S_IFREG;
167 inop->inode.iso_links = 1;
168 }
169 if (!bp
170 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
171 && (off = isonum_711(isodir->ext_attr_length))) {
172 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift),
173 NULL, &bp2);
174 bp = bp2;
175 }
176 if (bp) {
177 ap = (struct iso_extended_attributes *)bp->b_data;
178
179 if (isonum_711(ap->version) == 1) {
180 if (!(ap->perm[1]&0x10))
181 inop->inode.iso_mode |= S_IRUSR;
182 if (!(ap->perm[1]&0x40))
183 inop->inode.iso_mode |= S_IXUSR;
184 if (!(ap->perm[0]&0x01))
185 inop->inode.iso_mode |= S_IRGRP;
186 if (!(ap->perm[0]&0x04))
187 inop->inode.iso_mode |= S_IXGRP;
188 if (!(ap->perm[0]&0x10))
189 inop->inode.iso_mode |= S_IROTH;
190 if (!(ap->perm[0]&0x40))
191 inop->inode.iso_mode |= S_IXOTH;
192 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
193 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
194 } else
195 ap = NULL;
196 }
197 if (!ap) {
198 inop->inode.iso_mode |=
199 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
200 inop->inode.iso_uid = (uid_t)0;
201 inop->inode.iso_gid = (gid_t)0;
202 }
203 if (bp2)
204 brelse(bp2, 0);
205}
206
207/*
208 * Time stamps
209 */
210void
211cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop,
212 struct buf *bp)
213{
214 struct buf *bp2 = NULL;
215 struct iso_mnt *imp;
216 struct iso_extended_attributes *ap = NULL;
217 int off;
218
219 if (!bp
220 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
221 && (off = isonum_711(isodir->ext_attr_length))) {
222 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift),
223 NULL, &bp2);
224 bp = bp2;
225 }
226 if (bp) {
227 ap = (struct iso_extended_attributes *)bp->b_data;
228
229 if (isonum_711(ap->version) == 1) {
230 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
231 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
232 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
233 inop->inode.iso_ctime = inop->inode.iso_atime;
234 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
235 inop->inode.iso_mtime = inop->inode.iso_ctime;
236 } else
237 ap = NULL;
238 }
239 if (!ap) {
240 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime);
241 inop->inode.iso_atime = inop->inode.iso_ctime;
242 inop->inode.iso_mtime = inop->inode.iso_ctime;
243 }
244 if (bp2)
245 brelse(bp2, 0);
246}
247
248int
249cd9660_tstamp_conv7(const u_char *pi, struct timespec *pu)
250{
251 int crtime, days;
252 int y, m, d, hour, minute, second, tz;
253
254 y = pi[0] + 1900;
255 m = pi[1];
256 d = pi[2];
257 hour = pi[3];
258 minute = pi[4];
259 second = pi[5];
260 tz = pi[6];
261
262 if (y < 1970) {
263 pu->tv_sec = 0;
264 pu->tv_nsec = 0;
265 return 0;
266 } else {
267#ifdef ORIGINAL
268 /* computes day number relative to Sept. 19th,1989 */
269 /* don't even *THINK* about changing formula. It works! */
270 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
271#else
272 /*
273 * Changed :-) to make it relative to Jan. 1st, 1970
274 * and to disambiguate negative division
275 */
276 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
277#endif
278 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
279
280 /* timezone offset is unreliable on some disks */
281 if (-48 <= tz && tz <= 52)
282 crtime -= tz * 15 * 60;
283 }
284 pu->tv_sec = crtime;
285 pu->tv_nsec = 0;
286 return 1;
287}
288
289static u_int
290cd9660_chars2ui(const u_char *begin, int len)
291{
292 u_int rc;
293
294 for (rc = 0; --len >= 0;) {
295 rc *= 10;
296 rc += *begin++ - '0';
297 }
298 return rc;
299}
300
301int
302cd9660_tstamp_conv17(const u_char *pi, struct timespec *pu)
303{
304 u_char tbuf[7];
305
306 /* year:"0001"-"9999" -> -1900 */
307 tbuf[0] = cd9660_chars2ui(pi,4) - 1900;
308
309 /* month: " 1"-"12" -> 1 - 12 */
310 tbuf[1] = cd9660_chars2ui(pi + 4,2);
311
312 /* day: " 1"-"31" -> 1 - 31 */
313 tbuf[2] = cd9660_chars2ui(pi + 6,2);
314
315 /* hour: " 0"-"23" -> 0 - 23 */
316 tbuf[3] = cd9660_chars2ui(pi + 8,2);
317
318 /* minute:" 0"-"59" -> 0 - 59 */
319 tbuf[4] = cd9660_chars2ui(pi + 10,2);
320
321 /* second:" 0"-"59" -> 0 - 59 */
322 tbuf[5] = cd9660_chars2ui(pi + 12,2);
323
324 /* difference of GMT */
325 tbuf[6] = pi[16];
326
327 return cd9660_tstamp_conv7(tbuf,pu);
328}
329
330ino_t
331isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp)
332{
333 ino_t ino;
334
335 /*
336 * Note there is an inverse calculation in
337 * cd9660_vfsops.c:cd9660_loadvnode():
338 * ip->iso_start = ino >> imp->im_bshift;
339 * and also a calculation of the isodir pointer
340 * from an inode in cd9660_vnops.c:cd9660_readlink()
341 */
342 ino = ((ino_t)isonum_733(isodir->extent) +
343 isonum_711(isodir->ext_attr_length)) << imp->im_bshift;
344 return ino;
345}
346