Change the kernel dev_t, representing a pointer to a specinfo structure,
[dragonfly.git] / sys / vfs / isofs / cd9660 / cd9660_node.c
CommitLineData
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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 $
b13267a5 40 * $DragonFly: src/sys/vfs/isofs/cd9660/cd9660_node.c,v 1.20 2006/09/10 01:26:40 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
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52#include "iso.h"
53#include "cd9660_node.h"
54#include "cd9660_mount.h"
984263bc 55
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56#define CD9660_HASH_SIZE_LIMIT 8192
57
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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)
64#ifndef NULL_SIMPLELOCKS
8a8d5d85 65static struct lwkt_token cd9660_ihash_token;
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66#endif
67
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68static void cd9660_ihashrem (struct iso_node *);
69static unsigned cd9660_chars2ui (unsigned char *begin, int len);
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70
71/*
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72 * Initialize hash links for inodes and dnodes. CDs and DVDs are small
73 * and slow compared to hard disks, there is no need to have a huge hash
74 * table so the size is capped at CD9660_HASH_SIZE_LIMIT.
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75 */
76int
3fa8192b 77cd9660_init(struct vfsconf *vfsp)
984263bc 78{
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79 int hlimit;
80
81 if ((hlimit = desiredvnodes) < CD9660_HASH_SIZE_LIMIT)
82 hlimit = CD9660_HASH_SIZE_LIMIT;
83
3446c007 84 isohash = 16;
fb62a928 85 while (isohash < hlimit)
3446c007 86 isohash <<= 1;
77652cad 87 isohashtbl = kmalloc(sizeof(void *) * isohash,
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88 M_ISOFSMNT, M_WAITOK|M_ZERO);
89 --isohash;
41a01a4d 90 lwkt_token_init(&cd9660_ihash_token);
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91 return (0);
92}
93
94int
3fa8192b 95cd9660_uninit(struct vfsconf *vfsp)
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96{
97
98 if (isohashtbl != NULL)
efda3bd0 99 kfree(isohashtbl, M_ISOFSMNT);
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100 return (0);
101}
102
103
104/*
105 * Use the device/inum pair to find the incore inode, and return a pointer
106 * to it. If it is in core, but locked, wait for it.
107 */
108struct vnode *
b13267a5 109cd9660_ihashget(cdev_t dev, ino_t inum)
984263bc 110{
984263bc 111 struct iso_node *ip;
41a01a4d 112 lwkt_tokref ilock;
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113 struct vnode *vp;
114
41a01a4d 115 lwkt_gettoken(&ilock, &cd9660_ihash_token);
984263bc 116loop:
984263bc 117 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
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118 if (inum != ip->i_number || dev != ip->i_dev)
119 continue;
120 vp = ITOV(ip);
87de5057 121 if (vget(vp, LK_EXCLUSIVE))
5fd012e0 122 goto loop;
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123 /*
124 * We must check to see if the inode has been ripped
125 * out from under us after blocking.
126 */
127 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
128 if (inum == ip->i_number && dev == ip->i_dev)
129 break;
984263bc 130 }
41a01a4d 131 if (ip == NULL || ITOV(ip) != vp) {
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132 goto loop;
133 }
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134 lwkt_reltoken(&ilock);
135 return (vp);
984263bc 136 }
41a01a4d 137 lwkt_reltoken(&ilock);
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138 return (NULL);
139}
140
141/*
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142 * Insert the inode into the hash table, return 0 on success, non-zero
143 * if the inode has already been found to be in the hash table.
984263bc 144 */
3446c007 145int
dadab5e9 146cd9660_ihashins(struct iso_node *ip)
984263bc 147{
984263bc 148 struct iso_node **ipp, *iq;
41a01a4d 149 lwkt_tokref ilock;
984263bc 150
41a01a4d 151 lwkt_gettoken(&ilock, &cd9660_ihash_token);
984263bc 152 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
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153 while ((iq = *ipp) != NULL) {
154 if (iq->i_dev == ip->i_dev && iq->i_number == ip->i_number) {
155 lwkt_reltoken(&ilock);
156 return(EBUSY);
157 }
158 ipp = &iq->i_next;
159 }
160 ip->i_next = NULL;
984263bc 161 *ipp = ip;
41a01a4d 162 lwkt_reltoken(&ilock);
3446c007 163 return(0);
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164}
165
166/*
167 * Remove the inode from the hash table.
168 */
169static void
3fa8192b 170cd9660_ihashrem(struct iso_node *ip)
984263bc 171{
3446c007 172 struct iso_node **ipp, *iq;
41a01a4d 173 lwkt_tokref ilock;
984263bc 174
41a01a4d 175 lwkt_gettoken(&ilock, &cd9660_ihash_token);
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176 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
177 while ((iq = *ipp) != NULL) {
178 if (ip == iq)
179 break;
180 ipp = &iq->i_next;
181 }
182 KKASSERT(ip == iq);
183 *ipp = ip->i_next;
984263bc 184 ip->i_next = NULL;
41a01a4d 185 lwkt_reltoken(&ilock);
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186}
187
188/*
189 * Last reference to an inode, write the inode out and if necessary,
190 * truncate and deallocate the file.
3fa8192b 191 *
87de5057 192 * cd9660_inactive(struct vnode *a_vp)
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193 */
194int
3fa8192b 195cd9660_inactive(struct vop_inactive_args *ap)
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196{
197 struct vnode *vp = ap->a_vp;
3a1b0fdc 198 struct iso_node *ip = VTOI(vp);
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199 int error = 0;
200
201 if (prtactive && vp->v_usecount != 0)
202 vprint("cd9660_inactive: pushing active", vp);
203
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204 if (ip)
205 ip->i_flag = 0;
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206 /*
207 * If we are done with the inode, reclaim it
208 * so that it can be reused immediately.
209 */
3446c007 210 if (ip == NULL || ip->inode.iso_mode == 0)
87de5057 211 vrecycle(vp);
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212 return error;
213}
214
215/*
216 * Reclaim an inode so that it can be used for other purposes.
3fa8192b
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217 *
218 * cd9660_reclaim(struct vnode *a_vp, struct proc *a_p)
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219 */
220int
3fa8192b 221cd9660_reclaim(struct vop_reclaim_args *ap)
984263bc 222{
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223 struct vnode *vp = ap->a_vp;
224 struct iso_node *ip = VTOI(vp);
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225
226 if (prtactive && vp->v_usecount != 0)
227 vprint("cd9660_reclaim: pushing active", vp);
228 /*
5fd012e0 229 * Remove the inode from its hash chain.
984263bc 230 */
984263bc 231 vp->v_data = NULL;
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232 if (ip) {
233 cd9660_ihashrem(ip);
234 if (ip->i_devvp) {
235 vrele(ip->i_devvp);
236 ip->i_devvp = 0;
237 }
efda3bd0 238 kfree(ip, M_ISOFSNODE);
3446c007 239 }
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240 return (0);
241}
242
243/*
244 * File attributes
245 */
246void
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247cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop,
248 struct buf *bp, enum ISO_FTYPE ftype)
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249{
250 struct buf *bp2 = NULL;
251 struct iso_mnt *imp;
252 struct iso_extended_attributes *ap = NULL;
253 int off;
254
255 /* high sierra does not have timezone data, flag is one byte ahead */
256 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
257 &isodir->date[6]: isodir->flags)&2) {
258 inop->inode.iso_mode = S_IFDIR;
259 /*
260 * If we return 2, fts() will assume there are no subdirectories
261 * (just links for the path and .), so instead we return 1.
262 */
263 inop->inode.iso_links = 1;
264 } else {
265 inop->inode.iso_mode = S_IFREG;
266 inop->inode.iso_links = 1;
267 }
268 if (!bp
269 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
270 && (off = isonum_711(isodir->ext_attr_length))) {
899483f5 271 cd9660_devblkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
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272 &bp2);
273 bp = bp2;
274 }
275 if (bp) {
276 ap = (struct iso_extended_attributes *)bp->b_data;
277
278 if (isonum_711(ap->version) == 1) {
279 if (!(ap->perm[0]&0x40))
280 inop->inode.iso_mode |= VEXEC >> 6;
281 if (!(ap->perm[0]&0x10))
282 inop->inode.iso_mode |= VREAD >> 6;
283 if (!(ap->perm[0]&4))
284 inop->inode.iso_mode |= VEXEC >> 3;
285 if (!(ap->perm[0]&1))
286 inop->inode.iso_mode |= VREAD >> 3;
287 if (!(ap->perm[1]&0x40))
288 inop->inode.iso_mode |= VEXEC;
289 if (!(ap->perm[1]&0x10))
290 inop->inode.iso_mode |= VREAD;
291 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
292 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
293 } else
294 ap = NULL;
295 }
296 if (!ap) {
297 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6;
298 inop->inode.iso_uid = (uid_t)0;
299 inop->inode.iso_gid = (gid_t)0;
300 }
301 if (bp2)
302 brelse(bp2);
303}
304
305/*
306 * Time stamps
307 */
308void
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309cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop,
310 struct buf *bp, enum ISO_FTYPE ftype)
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311{
312 struct buf *bp2 = NULL;
313 struct iso_mnt *imp;
314 struct iso_extended_attributes *ap = NULL;
315 int off;
316
317 if (!bp
318 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
319 && (off = isonum_711(isodir->ext_attr_length))) {
899483f5 320 cd9660_devblkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
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321 &bp2);
322 bp = bp2;
323 }
324 if (bp) {
325 ap = (struct iso_extended_attributes *)bp->b_data;
326
327 if (ftype != ISO_FTYPE_HIGH_SIERRA
328 && isonum_711(ap->version) == 1) {
329 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
330 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
331 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
332 inop->inode.iso_ctime = inop->inode.iso_atime;
333 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
334 inop->inode.iso_mtime = inop->inode.iso_ctime;
335 } else
336 ap = NULL;
337 }
338 if (!ap) {
339 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
340 inop->inode.iso_atime = inop->inode.iso_ctime;
341 inop->inode.iso_mtime = inop->inode.iso_ctime;
342 }
343 if (bp2)
344 brelse(bp2);
345}
346
347int
3fa8192b 348cd9660_tstamp_conv7(u_char *pi, struct timespec *pu, enum ISO_FTYPE ftype)
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349{
350 int crtime, days;
351 int y, m, d, hour, minute, second, tz;
352
353 y = pi[0] + 1900;
354 m = pi[1];
355 d = pi[2];
356 hour = pi[3];
357 minute = pi[4];
358 second = pi[5];
359 if(ftype != ISO_FTYPE_HIGH_SIERRA)
360 tz = pi[6];
361 else
362 /* original high sierra misses timezone data */
363 tz = 0;
364
365 if (y < 1970) {
366 pu->tv_sec = 0;
367 pu->tv_nsec = 0;
368 return 0;
369 } else {
370#ifdef ORIGINAL
371 /* computes day number relative to Sept. 19th,1989 */
372 /* don't even *THINK* about changing formula. It works! */
373 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
374#else
375 /*
376 * Changed :-) to make it relative to Jan. 1st, 1970
377 * and to disambiguate negative division
378 */
379 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
380#endif
381 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
382
383 /* timezone offset is unreliable on some disks */
384 if (-48 <= tz && tz <= 52)
385 crtime -= tz * 15 * 60;
386 }
387 pu->tv_sec = crtime;
388 pu->tv_nsec = 0;
389 return 1;
390}
391
392static u_int
3fa8192b 393cd9660_chars2ui(u_char *begin, int len)
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394{
395 u_int rc;
396
397 for (rc = 0; --len >= 0;) {
398 rc *= 10;
399 rc += *begin++ - '0';
400 }
401 return rc;
402}
403
404int
3fa8192b 405cd9660_tstamp_conv17(u_char *pi, struct timespec *pu)
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406{
407 u_char buf[7];
408
409 /* year:"0001"-"9999" -> -1900 */
410 buf[0] = cd9660_chars2ui(pi,4) - 1900;
411
412 /* month: " 1"-"12" -> 1 - 12 */
413 buf[1] = cd9660_chars2ui(pi + 4,2);
414
415 /* day: " 1"-"31" -> 1 - 31 */
416 buf[2] = cd9660_chars2ui(pi + 6,2);
417
418 /* hour: " 0"-"23" -> 0 - 23 */
419 buf[3] = cd9660_chars2ui(pi + 8,2);
420
421 /* minute:" 0"-"59" -> 0 - 59 */
422 buf[4] = cd9660_chars2ui(pi + 10,2);
423
424 /* second:" 0"-"59" -> 0 - 59 */
425 buf[5] = cd9660_chars2ui(pi + 12,2);
426
427 /* difference of GMT */
428 buf[6] = pi[16];
429
430 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
431}
432
433ino_t
3fa8192b 434isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp)
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435{
436 ino_t ino;
437
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MD
438 ino = (ino_t)(isonum_733(isodir->extent) +
439 isonum_711(isodir->ext_attr_length)) << imp->im_bshift;
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440 return (ino);
441}