MP Implementation 1/2: Get the APIC code working again, sweetly integrate the
[dragonfly.git] / sys / vfs / isofs / cd9660 / cd9660_node.c
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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
39 * $FreeBSD: src/sys/isofs/cd9660/cd9660_node.c,v 1.29.2.1 2000/07/08 14:35:56 bp Exp $
8a8d5d85 40 * $DragonFly: src/sys/vfs/isofs/cd9660/cd9660_node.c,v 1.4 2003/07/06 21:23:50 dillon Exp $
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41 */
42
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/mount.h>
46#include <sys/proc.h>
47#include <sys/buf.h>
48#include <sys/vnode.h>
49#include <sys/malloc.h>
50#include <sys/stat.h>
51
52#include <isofs/cd9660/iso.h>
53#include <isofs/cd9660/cd9660_node.h>
54#include <isofs/cd9660/cd9660_mount.h>
55
56/*
57 * Structures associated with iso_node caching.
58 */
59static struct iso_node **isohashtbl;
60static u_long isohash;
61#define INOHASH(device, inum) ((minor(device) + ((inum)>>12)) & isohash)
62#ifndef NULL_SIMPLELOCKS
8a8d5d85 63static struct lwkt_token cd9660_ihash_token;
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64#endif
65
66static void cd9660_ihashrem __P((struct iso_node *));
67static unsigned cd9660_chars2ui __P((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);
8a8d5d85 78 lwkt_inittoken(&cd9660_ihash_token);
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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 */
97struct vnode *
98cd9660_ihashget(dev, inum)
99 dev_t dev;
100 ino_t inum;
101{
dadab5e9 102 struct thread *td = curthread; /* XXX */
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103 struct iso_node *ip;
104 struct vnode *vp;
105
106loop:
8a8d5d85 107 lwkt_gettoken(&cd9660_ihash_token);
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108 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
109 if (inum == ip->i_number && dev == ip->i_dev) {
110 vp = ITOV(ip);
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111 lwkt_gettoken(&vp->v_interlock); /* YYY */
112 lwkt_reltoken(&cd9660_ihash_token);
dadab5e9 113 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td))
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114 goto loop;
115 return (vp);
116 }
117 }
8a8d5d85 118 lwkt_reltoken(&cd9660_ihash_token);
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119 return (NULL);
120}
121
122/*
123 * Insert the inode into the hash table, and return it locked.
124 */
125void
dadab5e9 126cd9660_ihashins(struct iso_node *ip)
984263bc 127{
dadab5e9 128 struct thread *td = curthread; /* XXX */
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129 struct iso_node **ipp, *iq;
130
8a8d5d85 131 lwkt_gettoken(&cd9660_ihash_token);
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132 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
133 if ((iq = *ipp) != NULL)
134 iq->i_prev = &ip->i_next;
135 ip->i_next = iq;
136 ip->i_prev = ipp;
137 *ipp = ip;
8a8d5d85 138 lwkt_reltoken(&cd9660_ihash_token);
984263bc 139
8a8d5d85 140 lockmgr(&ip->i_lock, LK_EXCLUSIVE, NULL, td);
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141}
142
143/*
144 * Remove the inode from the hash table.
145 */
146static void
147cd9660_ihashrem(ip)
148 register struct iso_node *ip;
149{
150 register struct iso_node *iq;
151
8a8d5d85 152 lwkt_gettoken(&cd9660_ihash_token);
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153 if ((iq = ip->i_next) != NULL)
154 iq->i_prev = ip->i_prev;
155 *ip->i_prev = iq;
156#ifdef DIAGNOSTIC
157 ip->i_next = NULL;
158 ip->i_prev = NULL;
159#endif
8a8d5d85 160 lwkt_reltoken(&cd9660_ihash_token);
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161}
162
163/*
164 * Last reference to an inode, write the inode out and if necessary,
165 * truncate and deallocate the file.
166 */
167int
168cd9660_inactive(ap)
169 struct vop_inactive_args /* {
170 struct vnode *a_vp;
dadab5e9 171 struct thread *a_td;
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172 } */ *ap;
173{
174 struct vnode *vp = ap->a_vp;
dadab5e9 175 struct thread *td = ap->a_td;
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176 register struct iso_node *ip = VTOI(vp);
177 int error = 0;
178
179 if (prtactive && vp->v_usecount != 0)
180 vprint("cd9660_inactive: pushing active", vp);
181
182 ip->i_flag = 0;
dadab5e9 183 VOP_UNLOCK(vp, 0, td);
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184 /*
185 * If we are done with the inode, reclaim it
186 * so that it can be reused immediately.
187 */
188 if (ip->inode.iso_mode == 0)
8a8d5d85 189 vrecycle(vp, NULL, td);
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190 return error;
191}
192
193/*
194 * Reclaim an inode so that it can be used for other purposes.
195 */
196int
197cd9660_reclaim(ap)
198 struct vop_reclaim_args /* {
199 struct vnode *a_vp;
200 struct proc *a_p;
201 } */ *ap;
202{
203 register struct vnode *vp = ap->a_vp;
204 register struct iso_node *ip = VTOI(vp);
205
206 if (prtactive && vp->v_usecount != 0)
207 vprint("cd9660_reclaim: pushing active", vp);
208 /*
209 * Remove the inode from its hash chain.
210 */
211 cd9660_ihashrem(ip);
212 /*
213 * Purge old data structures associated with the inode.
214 */
215 cache_purge(vp);
216 if (ip->i_devvp) {
217 vrele(ip->i_devvp);
218 ip->i_devvp = 0;
219 }
220 FREE(vp->v_data, M_ISOFSNODE);
221 vp->v_data = NULL;
222 return (0);
223}
224
225/*
226 * File attributes
227 */
228void
229cd9660_defattr(isodir, inop, bp, ftype)
230 struct iso_directory_record *isodir;
231 struct iso_node *inop;
232 struct buf *bp;
233 enum ISO_FTYPE ftype;
234{
235 struct buf *bp2 = NULL;
236 struct iso_mnt *imp;
237 struct iso_extended_attributes *ap = NULL;
238 int off;
239
240 /* high sierra does not have timezone data, flag is one byte ahead */
241 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
242 &isodir->date[6]: isodir->flags)&2) {
243 inop->inode.iso_mode = S_IFDIR;
244 /*
245 * If we return 2, fts() will assume there are no subdirectories
246 * (just links for the path and .), so instead we return 1.
247 */
248 inop->inode.iso_links = 1;
249 } else {
250 inop->inode.iso_mode = S_IFREG;
251 inop->inode.iso_links = 1;
252 }
253 if (!bp
254 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
255 && (off = isonum_711(isodir->ext_attr_length))) {
256 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
257 &bp2);
258 bp = bp2;
259 }
260 if (bp) {
261 ap = (struct iso_extended_attributes *)bp->b_data;
262
263 if (isonum_711(ap->version) == 1) {
264 if (!(ap->perm[0]&0x40))
265 inop->inode.iso_mode |= VEXEC >> 6;
266 if (!(ap->perm[0]&0x10))
267 inop->inode.iso_mode |= VREAD >> 6;
268 if (!(ap->perm[0]&4))
269 inop->inode.iso_mode |= VEXEC >> 3;
270 if (!(ap->perm[0]&1))
271 inop->inode.iso_mode |= VREAD >> 3;
272 if (!(ap->perm[1]&0x40))
273 inop->inode.iso_mode |= VEXEC;
274 if (!(ap->perm[1]&0x10))
275 inop->inode.iso_mode |= VREAD;
276 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
277 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
278 } else
279 ap = NULL;
280 }
281 if (!ap) {
282 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6;
283 inop->inode.iso_uid = (uid_t)0;
284 inop->inode.iso_gid = (gid_t)0;
285 }
286 if (bp2)
287 brelse(bp2);
288}
289
290/*
291 * Time stamps
292 */
293void
294cd9660_deftstamp(isodir,inop,bp,ftype)
295 struct iso_directory_record *isodir;
296 struct iso_node *inop;
297 struct buf *bp;
298 enum ISO_FTYPE ftype;
299{
300 struct buf *bp2 = NULL;
301 struct iso_mnt *imp;
302 struct iso_extended_attributes *ap = NULL;
303 int off;
304
305 if (!bp
306 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
307 && (off = isonum_711(isodir->ext_attr_length))) {
308 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
309 &bp2);
310 bp = bp2;
311 }
312 if (bp) {
313 ap = (struct iso_extended_attributes *)bp->b_data;
314
315 if (ftype != ISO_FTYPE_HIGH_SIERRA
316 && isonum_711(ap->version) == 1) {
317 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
318 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
319 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
320 inop->inode.iso_ctime = inop->inode.iso_atime;
321 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
322 inop->inode.iso_mtime = inop->inode.iso_ctime;
323 } else
324 ap = NULL;
325 }
326 if (!ap) {
327 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
328 inop->inode.iso_atime = inop->inode.iso_ctime;
329 inop->inode.iso_mtime = inop->inode.iso_ctime;
330 }
331 if (bp2)
332 brelse(bp2);
333}
334
335int
336cd9660_tstamp_conv7(pi,pu,ftype)
337 u_char *pi;
338 struct timespec *pu;
339 enum ISO_FTYPE ftype;
340{
341 int crtime, days;
342 int y, m, d, hour, minute, second, tz;
343
344 y = pi[0] + 1900;
345 m = pi[1];
346 d = pi[2];
347 hour = pi[3];
348 minute = pi[4];
349 second = pi[5];
350 if(ftype != ISO_FTYPE_HIGH_SIERRA)
351 tz = pi[6];
352 else
353 /* original high sierra misses timezone data */
354 tz = 0;
355
356 if (y < 1970) {
357 pu->tv_sec = 0;
358 pu->tv_nsec = 0;
359 return 0;
360 } else {
361#ifdef ORIGINAL
362 /* computes day number relative to Sept. 19th,1989 */
363 /* don't even *THINK* about changing formula. It works! */
364 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
365#else
366 /*
367 * Changed :-) to make it relative to Jan. 1st, 1970
368 * and to disambiguate negative division
369 */
370 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
371#endif
372 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
373
374 /* timezone offset is unreliable on some disks */
375 if (-48 <= tz && tz <= 52)
376 crtime -= tz * 15 * 60;
377 }
378 pu->tv_sec = crtime;
379 pu->tv_nsec = 0;
380 return 1;
381}
382
383static u_int
384cd9660_chars2ui(begin,len)
385 u_char *begin;
386 int len;
387{
388 u_int rc;
389
390 for (rc = 0; --len >= 0;) {
391 rc *= 10;
392 rc += *begin++ - '0';
393 }
394 return rc;
395}
396
397int
398cd9660_tstamp_conv17(pi,pu)
399 u_char *pi;
400 struct timespec *pu;
401{
402 u_char buf[7];
403
404 /* year:"0001"-"9999" -> -1900 */
405 buf[0] = cd9660_chars2ui(pi,4) - 1900;
406
407 /* month: " 1"-"12" -> 1 - 12 */
408 buf[1] = cd9660_chars2ui(pi + 4,2);
409
410 /* day: " 1"-"31" -> 1 - 31 */
411 buf[2] = cd9660_chars2ui(pi + 6,2);
412
413 /* hour: " 0"-"23" -> 0 - 23 */
414 buf[3] = cd9660_chars2ui(pi + 8,2);
415
416 /* minute:" 0"-"59" -> 0 - 59 */
417 buf[4] = cd9660_chars2ui(pi + 10,2);
418
419 /* second:" 0"-"59" -> 0 - 59 */
420 buf[5] = cd9660_chars2ui(pi + 12,2);
421
422 /* difference of GMT */
423 buf[6] = pi[16];
424
425 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
426}
427
428ino_t
429isodirino(isodir, imp)
430 struct iso_directory_record *isodir;
431 struct iso_mnt *imp;
432{
433 ino_t ino;
434
435 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length))
436 << imp->im_bshift;
437 return (ino);
438}