kernel - lwkt_token revamp
[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 $
3c37c940 40 * $DragonFly: src/sys/vfs/isofs/cd9660/cd9660_node.c,v 1.21 2007/05/06 19:23:34 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;
3b998fa9 90 lwkt_token_init(&cd9660_ihash_token, 1);
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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{
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111 struct iso_node *ip;
112 struct vnode *vp;
113
3b998fa9 114 lwkt_gettoken(&cd9660_ihash_token);
984263bc 115loop:
984263bc 116 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
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117 if (inum != ip->i_number || dev != ip->i_dev)
118 continue;
119 vp = ITOV(ip);
87de5057 120 if (vget(vp, LK_EXCLUSIVE))
5fd012e0 121 goto loop;
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122 /*
123 * We must check to see if the inode has been ripped
124 * out from under us after blocking.
125 */
126 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
127 if (inum == ip->i_number && dev == ip->i_dev)
128 break;
984263bc 129 }
41a01a4d 130 if (ip == NULL || ITOV(ip) != vp) {
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131 goto loop;
132 }
3b998fa9 133 lwkt_reltoken(&cd9660_ihash_token);
41a01a4d 134 return (vp);
984263bc 135 }
3b998fa9 136 lwkt_reltoken(&cd9660_ihash_token);
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137 return (NULL);
138}
139
140/*
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141 * Insert the inode into the hash table, return 0 on success, non-zero
142 * if the inode has already been found to be in the hash table.
984263bc 143 */
3446c007 144int
dadab5e9 145cd9660_ihashins(struct iso_node *ip)
984263bc 146{
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147 struct iso_node **ipp, *iq;
148
3b998fa9 149 lwkt_gettoken(&cd9660_ihash_token);
984263bc 150 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
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151 while ((iq = *ipp) != NULL) {
152 if (iq->i_dev == ip->i_dev && iq->i_number == ip->i_number) {
3b998fa9 153 lwkt_reltoken(&cd9660_ihash_token);
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154 return(EBUSY);
155 }
156 ipp = &iq->i_next;
157 }
158 ip->i_next = NULL;
984263bc 159 *ipp = ip;
3b998fa9 160 lwkt_reltoken(&cd9660_ihash_token);
3446c007 161 return(0);
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162}
163
164/*
165 * Remove the inode from the hash table.
166 */
167static void
3fa8192b 168cd9660_ihashrem(struct iso_node *ip)
984263bc 169{
3446c007 170 struct iso_node **ipp, *iq;
984263bc 171
3b998fa9 172 lwkt_gettoken(&cd9660_ihash_token);
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173 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
174 while ((iq = *ipp) != NULL) {
175 if (ip == iq)
176 break;
177 ipp = &iq->i_next;
178 }
179 KKASSERT(ip == iq);
180 *ipp = ip->i_next;
984263bc 181 ip->i_next = NULL;
3b998fa9 182 lwkt_reltoken(&cd9660_ihash_token);
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183}
184
185/*
186 * Last reference to an inode, write the inode out and if necessary,
187 * truncate and deallocate the file.
3fa8192b 188 *
87de5057 189 * cd9660_inactive(struct vnode *a_vp)
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190 */
191int
3fa8192b 192cd9660_inactive(struct vop_inactive_args *ap)
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193{
194 struct vnode *vp = ap->a_vp;
3a1b0fdc 195 struct iso_node *ip = VTOI(vp);
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196 int error = 0;
197
3c37c940 198 if (prtactive && vp->v_sysref.refcnt > 1)
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199 vprint("cd9660_inactive: pushing active", vp);
200
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201 if (ip)
202 ip->i_flag = 0;
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203 /*
204 * If we are done with the inode, reclaim it
205 * so that it can be reused immediately.
206 */
3446c007 207 if (ip == NULL || ip->inode.iso_mode == 0)
87de5057 208 vrecycle(vp);
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209 return error;
210}
211
212/*
213 * Reclaim an inode so that it can be used for other purposes.
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214 *
215 * cd9660_reclaim(struct vnode *a_vp, struct proc *a_p)
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216 */
217int
3fa8192b 218cd9660_reclaim(struct vop_reclaim_args *ap)
984263bc 219{
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220 struct vnode *vp = ap->a_vp;
221 struct iso_node *ip = VTOI(vp);
984263bc 222
3c37c940 223 if (prtactive && vp->v_sysref.refcnt > 1)
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224 vprint("cd9660_reclaim: pushing active", vp);
225 /*
5fd012e0 226 * Remove the inode from its hash chain.
984263bc 227 */
984263bc 228 vp->v_data = NULL;
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229 if (ip) {
230 cd9660_ihashrem(ip);
231 if (ip->i_devvp) {
232 vrele(ip->i_devvp);
233 ip->i_devvp = 0;
234 }
efda3bd0 235 kfree(ip, M_ISOFSNODE);
3446c007 236 }
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237 return (0);
238}
239
240/*
241 * File attributes
242 */
243void
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244cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop,
245 struct buf *bp, enum ISO_FTYPE ftype)
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246{
247 struct buf *bp2 = NULL;
248 struct iso_mnt *imp;
249 struct iso_extended_attributes *ap = NULL;
250 int off;
251
252 /* high sierra does not have timezone data, flag is one byte ahead */
253 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
254 &isodir->date[6]: isodir->flags)&2) {
255 inop->inode.iso_mode = S_IFDIR;
256 /*
257 * If we return 2, fts() will assume there are no subdirectories
258 * (just links for the path and .), so instead we return 1.
259 */
260 inop->inode.iso_links = 1;
261 } else {
262 inop->inode.iso_mode = S_IFREG;
263 inop->inode.iso_links = 1;
264 }
265 if (!bp
266 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
267 && (off = isonum_711(isodir->ext_attr_length))) {
899483f5 268 cd9660_devblkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
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269 &bp2);
270 bp = bp2;
271 }
272 if (bp) {
273 ap = (struct iso_extended_attributes *)bp->b_data;
274
275 if (isonum_711(ap->version) == 1) {
276 if (!(ap->perm[0]&0x40))
277 inop->inode.iso_mode |= VEXEC >> 6;
278 if (!(ap->perm[0]&0x10))
279 inop->inode.iso_mode |= VREAD >> 6;
280 if (!(ap->perm[0]&4))
281 inop->inode.iso_mode |= VEXEC >> 3;
282 if (!(ap->perm[0]&1))
283 inop->inode.iso_mode |= VREAD >> 3;
284 if (!(ap->perm[1]&0x40))
285 inop->inode.iso_mode |= VEXEC;
286 if (!(ap->perm[1]&0x10))
287 inop->inode.iso_mode |= VREAD;
288 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
289 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
290 } else
291 ap = NULL;
292 }
293 if (!ap) {
294 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6;
295 inop->inode.iso_uid = (uid_t)0;
296 inop->inode.iso_gid = (gid_t)0;
297 }
298 if (bp2)
299 brelse(bp2);
300}
301
302/*
303 * Time stamps
304 */
305void
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306cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop,
307 struct buf *bp, enum ISO_FTYPE ftype)
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308{
309 struct buf *bp2 = NULL;
310 struct iso_mnt *imp;
311 struct iso_extended_attributes *ap = NULL;
312 int off;
313
314 if (!bp
315 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
316 && (off = isonum_711(isodir->ext_attr_length))) {
899483f5 317 cd9660_devblkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
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318 &bp2);
319 bp = bp2;
320 }
321 if (bp) {
322 ap = (struct iso_extended_attributes *)bp->b_data;
323
324 if (ftype != ISO_FTYPE_HIGH_SIERRA
325 && isonum_711(ap->version) == 1) {
326 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
327 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
328 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
329 inop->inode.iso_ctime = inop->inode.iso_atime;
330 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
331 inop->inode.iso_mtime = inop->inode.iso_ctime;
332 } else
333 ap = NULL;
334 }
335 if (!ap) {
336 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
337 inop->inode.iso_atime = inop->inode.iso_ctime;
338 inop->inode.iso_mtime = inop->inode.iso_ctime;
339 }
340 if (bp2)
341 brelse(bp2);
342}
343
344int
3fa8192b 345cd9660_tstamp_conv7(u_char *pi, struct timespec *pu, enum ISO_FTYPE ftype)
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346{
347 int crtime, days;
348 int y, m, d, hour, minute, second, tz;
349
350 y = pi[0] + 1900;
351 m = pi[1];
352 d = pi[2];
353 hour = pi[3];
354 minute = pi[4];
355 second = pi[5];
356 if(ftype != ISO_FTYPE_HIGH_SIERRA)
357 tz = pi[6];
358 else
359 /* original high sierra misses timezone data */
360 tz = 0;
361
362 if (y < 1970) {
363 pu->tv_sec = 0;
364 pu->tv_nsec = 0;
365 return 0;
366 } else {
367#ifdef ORIGINAL
368 /* computes day number relative to Sept. 19th,1989 */
369 /* don't even *THINK* about changing formula. It works! */
370 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
371#else
372 /*
373 * Changed :-) to make it relative to Jan. 1st, 1970
374 * and to disambiguate negative division
375 */
376 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
377#endif
378 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
379
380 /* timezone offset is unreliable on some disks */
381 if (-48 <= tz && tz <= 52)
382 crtime -= tz * 15 * 60;
383 }
384 pu->tv_sec = crtime;
385 pu->tv_nsec = 0;
386 return 1;
387}
388
389static u_int
3fa8192b 390cd9660_chars2ui(u_char *begin, int len)
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391{
392 u_int rc;
393
394 for (rc = 0; --len >= 0;) {
395 rc *= 10;
396 rc += *begin++ - '0';
397 }
398 return rc;
399}
400
401int
3fa8192b 402cd9660_tstamp_conv17(u_char *pi, struct timespec *pu)
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403{
404 u_char buf[7];
405
406 /* year:"0001"-"9999" -> -1900 */
407 buf[0] = cd9660_chars2ui(pi,4) - 1900;
408
409 /* month: " 1"-"12" -> 1 - 12 */
410 buf[1] = cd9660_chars2ui(pi + 4,2);
411
412 /* day: " 1"-"31" -> 1 - 31 */
413 buf[2] = cd9660_chars2ui(pi + 6,2);
414
415 /* hour: " 0"-"23" -> 0 - 23 */
416 buf[3] = cd9660_chars2ui(pi + 8,2);
417
418 /* minute:" 0"-"59" -> 0 - 59 */
419 buf[4] = cd9660_chars2ui(pi + 10,2);
420
421 /* second:" 0"-"59" -> 0 - 59 */
422 buf[5] = cd9660_chars2ui(pi + 12,2);
423
424 /* difference of GMT */
425 buf[6] = pi[16];
426
427 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
428}
429
430ino_t
3fa8192b 431isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp)
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432{
433 ino_t ino;
434
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435 ino = (ino_t)(isonum_733(isodir->extent) +
436 isonum_711(isodir->ext_attr_length)) << imp->im_bshift;
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437 return (ino);
438}