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 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)cd9660_node.c 8.2 (Berkeley) 1/23/94
|
44#include <sys/param.h>
45#include <sys/systm.h>
46#include <sys/mount.h>
47#include <sys/bio.h>
48#include <sys/buf.h>
49#include <sys/vnode.h>
50#include <sys/malloc.h>
51#include <sys/stat.h>
52#include <sys/mutex.h>
53
54#include <isofs/cd9660/iso.h>
55#include <isofs/cd9660/cd9660_node.h>
56#include <isofs/cd9660/cd9660_mount.h>
57
58/*
59 * Structures associated with iso_node caching.
60 */
61static struct iso_node **isohashtbl;
62static u_long isohash;
63#define INOHASH(device, inum) ((minor(device) + ((inum)>>12)) & isohash)
64static struct mtx cd9660_ihash_mtx;
65
66static void cd9660_ihashrem(struct iso_node *);
67static unsigned cd9660_chars2ui(unsigned char *begin, int len);
68
69/*
70 * Initialize hash links for inodes and dnodes.
71 */
72int
73cd9660_init(vfsp)
74 struct vfsconf *vfsp;
75{
76
77 isohashtbl = hashinit(desiredvnodes, M_ISOFSMNT, &isohash);
78 mtx_init(&cd9660_ihash_mtx, "cd9660_ihash", NULL, MTX_DEF);
79 return (0);
80}
81
82int
83cd9660_uninit(vfsp)
84 struct vfsconf *vfsp;
85{
86
87 if (isohashtbl != NULL)
88 free(isohashtbl, M_ISOFSMNT);
89 return (0);
90}
91
92
93/*
94 * Use the device/inum pair to find the incore inode, and return a pointer
95 * to it. If it is in core, but locked, wait for it.
96 */
97int
98cd9660_ihashget(dev, inum, flags, vpp)
99 dev_t dev;
100 ino_t inum;
101 int flags;
102 struct vnode **vpp;
103{
104 struct thread *td = curthread; /* XXX */
105 struct iso_node *ip;
106 struct vnode *vp;
107 int error;
108
109 *vpp = NULL;
110loop:
111 mtx_lock(&cd9660_ihash_mtx);
112 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
113 if (inum == ip->i_number && dev == ip->i_dev) {
114 vp = ITOV(ip);
115 mtx_lock(&vp->v_interlock);
116 mtx_unlock(&cd9660_ihash_mtx);
117 error = vget(vp, flags | LK_INTERLOCK, td);
118 if (error == ENOENT)
119 goto loop;
120 if (error)
121 return (error);
122 *vpp = vp;
123 return (0);
124 }
125 }
126 mtx_unlock(&cd9660_ihash_mtx);
127 return (0);
128}
129
130/*
131 * Insert the inode into the hash table, and return it locked.
132 */
133void
134cd9660_ihashins(ip)
135 struct iso_node *ip;
136{
137 struct iso_node **ipp, *iq;
138
139 mtx_lock(&cd9660_ihash_mtx);
140 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
141 if ((iq = *ipp) != NULL)
142 iq->i_prev = &ip->i_next;
143 ip->i_next = iq;
144 ip->i_prev = ipp;
145 *ipp = ip;
146 mtx_unlock(&cd9660_ihash_mtx);
147
148 vn_lock(ITOV(ip), LK_EXCLUSIVE | LK_RETRY, curthread);
149}
150
151/*
152 * Remove the inode from the hash table.
153 */
154static void
155cd9660_ihashrem(ip)
156 register struct iso_node *ip;
157{
158 register struct iso_node *iq;
159
160 mtx_lock(&cd9660_ihash_mtx);
161 if ((iq = ip->i_next) != NULL)
162 iq->i_prev = ip->i_prev;
163 *ip->i_prev = iq;
164#ifdef DIAGNOSTIC
165 ip->i_next = NULL;
166 ip->i_prev = NULL;
167#endif
168 mtx_unlock(&cd9660_ihash_mtx);
169}
170
171/*
172 * Last reference to an inode, write the inode out and if necessary,
173 * truncate and deallocate the file.
174 */
175int
176cd9660_inactive(ap)
177 struct vop_inactive_args /* {
178 struct vnode *a_vp;
179 struct thread *a_td;
180 } */ *ap;
181{
182 struct vnode *vp = ap->a_vp;
183 struct thread *td = ap->a_td;
184 register struct iso_node *ip = VTOI(vp);
185 int error = 0;
186
187 if (prtactive && vrefcnt(vp) != 0)
188 vprint("cd9660_inactive: pushing active", vp);
189
190 ip->i_flag = 0;
191 VOP_UNLOCK(vp, 0, td);
192 /*
193 * If we are done with the inode, reclaim it
194 * so that it can be reused immediately.
195 */
196 if (ip->inode.iso_mode == 0)
197 vrecycle(vp, NULL, td);
198 return error;
199}
200
201/*
202 * Reclaim an inode so that it can be used for other purposes.
203 */
204int
205cd9660_reclaim(ap)
206 struct vop_reclaim_args /* {
207 struct vnode *a_vp;
208 struct thread *a_td;
209 } */ *ap;
210{
211 register struct vnode *vp = ap->a_vp;
212 register struct iso_node *ip = VTOI(vp);
213
214 if (prtactive && vrefcnt(vp) != 0)
215 vprint("cd9660_reclaim: pushing active", vp);
216 /*
217 * Remove the inode from its hash chain.
218 */
219 cd9660_ihashrem(ip);
220 /*
221 * Purge old data structures associated with the inode.
222 */
223 cache_purge(vp);
224 if (ip->i_devvp) {
225 vrele(ip->i_devvp);
226 ip->i_devvp = 0;
227 }
228 FREE(vp->v_data, M_ISOFSNODE);
229 vp->v_data = NULL;
230 return (0);
231}
232
233/*
234 * File attributes
235 */
236void
237cd9660_defattr(isodir, inop, bp, ftype)
238 struct iso_directory_record *isodir;
239 struct iso_node *inop;
240 struct buf *bp;
241 enum ISO_FTYPE ftype;
242{
243 struct buf *bp2 = NULL;
244 struct iso_mnt *imp;
245 struct iso_extended_attributes *ap = NULL;
246 int off;
247
248 /* high sierra does not have timezone data, flag is one byte ahead */
249 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
250 &isodir->date[6]: isodir->flags)&2) {
251 inop->inode.iso_mode = S_IFDIR;
252 /*
253 * If we return 2, fts() will assume there are no subdirectories
254 * (just links for the path and .), so instead we return 1.
255 */
256 inop->inode.iso_links = 1;
257 } else {
258 inop->inode.iso_mode = S_IFREG;
259 inop->inode.iso_links = 1;
260 }
261 if (!bp
262 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
263 && (off = isonum_711(isodir->ext_attr_length))) {
264 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
265 &bp2);
266 bp = bp2;
267 }
268 if (bp) {
269 ap = (struct iso_extended_attributes *)bp->b_data;
270
271 if (isonum_711(ap->version) == 1) {
272 if (!(ap->perm[0]&0x40))
273 inop->inode.iso_mode |= VEXEC >> 6;
274 if (!(ap->perm[0]&0x10))
275 inop->inode.iso_mode |= VREAD >> 6;
276 if (!(ap->perm[0]&4))
277 inop->inode.iso_mode |= VEXEC >> 3;
278 if (!(ap->perm[0]&1))
279 inop->inode.iso_mode |= VREAD >> 3;
280 if (!(ap->perm[1]&0x40))
281 inop->inode.iso_mode |= VEXEC;
282 if (!(ap->perm[1]&0x10))
283 inop->inode.iso_mode |= VREAD;
284 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
285 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
286 } else
287 ap = NULL;
288 }
289 if (!ap) {
290 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6;
291 inop->inode.iso_uid = (uid_t)0;
292 inop->inode.iso_gid = (gid_t)0;
293 }
294 if (bp2)
295 brelse(bp2);
296}
297
298/*
299 * Time stamps
300 */
301void
302cd9660_deftstamp(isodir,inop,bp,ftype)
303 struct iso_directory_record *isodir;
304 struct iso_node *inop;
305 struct buf *bp;
306 enum ISO_FTYPE ftype;
307{
308 struct buf *bp2 = NULL;
309 struct iso_mnt *imp;
310 struct iso_extended_attributes *ap = NULL;
311 int off;
312
313 if (!bp
314 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
315 && (off = isonum_711(isodir->ext_attr_length))) {
316 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
317 &bp2);
318 bp = bp2;
319 }
320 if (bp) {
321 ap = (struct iso_extended_attributes *)bp->b_data;
322
323 if (ftype != ISO_FTYPE_HIGH_SIERRA
324 && isonum_711(ap->version) == 1) {
325 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
326 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
327 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
328 inop->inode.iso_ctime = inop->inode.iso_atime;
329 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
330 inop->inode.iso_mtime = inop->inode.iso_ctime;
331 } else
332 ap = NULL;
333 }
334 if (!ap) {
335 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
336 inop->inode.iso_atime = inop->inode.iso_ctime;
337 inop->inode.iso_mtime = inop->inode.iso_ctime;
338 }
339 if (bp2)
340 brelse(bp2);
341}
342
343int
344cd9660_tstamp_conv7(pi,pu,ftype)
345 u_char *pi;
346 struct timespec *pu;
347 enum ISO_FTYPE ftype;
348{
349 int crtime, days;
350 int y, m, d, hour, minute, second, tz;
351
352 y = pi[0] + 1900;
353 m = pi[1];
354 d = pi[2];
355 hour = pi[3];
356 minute = pi[4];
357 second = pi[5];
358 if(ftype != ISO_FTYPE_HIGH_SIERRA)
359 tz = pi[6];
360 else
361 /* original high sierra misses timezone data */
362 tz = 0;
363
364 if (y < 1970) {
365 pu->tv_sec = 0;
366 pu->tv_nsec = 0;
367 return 0;
368 } else {
369#ifdef ORIGINAL
370 /* computes day number relative to Sept. 19th,1989 */
371 /* don't even *THINK* about changing formula. It works! */
372 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
373#else
374 /*
375 * Changed :-) to make it relative to Jan. 1st, 1970
376 * and to disambiguate negative division
377 */
378 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
379#endif
380 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
381
382 /* timezone offset is unreliable on some disks */
383 if (-48 <= tz && tz <= 52)
384 crtime -= tz * 15 * 60;
385 }
386 pu->tv_sec = crtime;
387 pu->tv_nsec = 0;
388 return 1;
389}
390
391static u_int
392cd9660_chars2ui(begin,len)
393 u_char *begin;
394 int len;
395{
396 u_int rc;
397
398 for (rc = 0; --len >= 0;) {
399 rc *= 10;
400 rc += *begin++ - '0';
401 }
402 return rc;
403}
404
405int
406cd9660_tstamp_conv17(pi,pu)
407 u_char *pi;
408 struct timespec *pu;
409{
410 u_char buf[7];
411
412 /* year:"0001"-"9999" -> -1900 */
413 buf[0] = cd9660_chars2ui(pi,4) - 1900;
414
415 /* month: " 1"-"12" -> 1 - 12 */
416 buf[1] = cd9660_chars2ui(pi + 4,2);
417
418 /* day: " 1"-"31" -> 1 - 31 */
419 buf[2] = cd9660_chars2ui(pi + 6,2);
420
421 /* hour: " 0"-"23" -> 0 - 23 */
422 buf[3] = cd9660_chars2ui(pi + 8,2);
423
424 /* minute:" 0"-"59" -> 0 - 59 */
425 buf[4] = cd9660_chars2ui(pi + 10,2);
426
427 /* second:" 0"-"59" -> 0 - 59 */
428 buf[5] = cd9660_chars2ui(pi + 12,2);
429
430 /* difference of GMT */
431 buf[6] = pi[16];
432
433 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
434}
435
436ino_t
437isodirino(isodir, imp)
438 struct iso_directory_record *isodir;
439 struct iso_mnt *imp;
440{
441 ino_t ino;
442
443 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length))
444 << imp->im_bshift;
445 return (ino);
446}
|