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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /* $NetBSD: cd9660_node.c,v 1.13 1994/12/24 15:30:07 cgd Exp $ */
23:
24: /*-
25: * Copyright (c) 1982, 1986, 1989, 1994
26: * The Regents of the University of California. All rights reserved.
27: *
28: * This code is derived from software contributed to Berkeley
29: * by Pace Willisson ([email protected]). The Rock Ridge Extension
30: * Support code is derived from software contributed to Berkeley
31: * by Atsushi Murai ([email protected]).
32: *
33: * Redistribution and use in source and binary forms, with or without
34: * modification, are permitted provided that the following conditions
35: * are met:
36: * 1. Redistributions of source code must retain the above copyright
37: * notice, this list of conditions and the following disclaimer.
38: * 2. Redistributions in binary form must reproduce the above copyright
39: * notice, this list of conditions and the following disclaimer in the
40: * documentation and/or other materials provided with the distribution.
41: * 3. All advertising materials mentioning features or use of this software
42: * must display the following acknowledgement:
43: * This product includes software developed by the University of
44: * California, Berkeley and its contributors.
45: * 4. Neither the name of the University nor the names of its contributors
46: * may be used to endorse or promote products derived from this software
47: * without specific prior written permission.
48: *
49: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59: * SUCH DAMAGE.
60: *
61: * @(#)cd9660_node.c 8.5 (Berkeley) 12/5/94
62:
63:
64:
65: * HISTORY
66: * 22-Jan-98 radar 1669467 - ISO 9660 CD support - jwc
67: * 17-Feb-98 radar 1669467 - changed lock protocols to use the lock manager - chw
68:
69: */
70:
71: #include <sys/param.h>
72: #include <sys/systm.h>
73: #include <sys/mount.h>
74: #include <sys/proc.h>
75: #include <sys/file.h>
76: #include <sys/buf.h>
77: #include <sys/vnode.h>
78: #include <sys/kernel.h>
79: #include <sys/malloc.h>
80: #include <sys/stat.h>
81:
82: // radar 1669467 Using the lock manager now so include lock.h
83: #include <sys/lock.h>
84:
85: #include <isofs/cd9660/iso.h>
86: #include <isofs/cd9660/cd9660_node.h>
87: #include <isofs/cd9660/iso_rrip.h>
88: #include <isofs/cd9660/cd9660_mount.h>
89:
90: /*
91: * Structures associated with iso_node caching.
92: */
93: struct iso_node **isohashtbl;
94: u_long isohash;
95: #define INOHASH(device, inum) (((device) + ((inum)>>12)) & isohash)
96:
97: #ifdef ISODEVMAP
98: struct iso_node **idvhashtbl;
99: u_long idvhash;
100: #define DNOHASH(device, inum) (((device) + ((inum)>>12)) & idvhash)
101: #endif
102:
103: /* defined in bsd/ufs/ufs/ufs_inode.c */
104: extern int prtactive; /* 1 => print out reclaim of active vnodes */
105:
106: extern void cache_purge (struct vnode *vp);
107:
108: /*
109: * Initialize hash links for inodes and dnodes.
110: */
111: int
112: cd9660_init()
113: {
114:
115: isohashtbl = hashinit(desiredvnodes, M_ISOFSMNT, &isohash);
116: #ifdef ISODEVMAP
117: idvhashtbl = hashinit(desiredvnodes / 8, M_ISOFSMNT, &idvhash);
118: #endif
119: return 0;
120: }
121:
122: #ifdef ISODEVMAP
123: /*
124: * Enter a new node into the device hash list
125: */
126: struct iso_dnode *
127: iso_dmap(device, inum, create)
128: dev_t device;
129: ino_t inum;
130: int create;
131: {
132: register struct iso_dnode **dpp, *dp, *dq;
133:
134: dpp = &idvhashtbl[DNOHASH(device, inum)];
135: for (dp = *dpp;; dp = dp->d_next) {
136: if (dp == NULL)
137: return (NULL);
138: if (inum == dp->i_number && device == dp->i_dev)
139: return (dp);
140:
141: if (!create)
142: return (NULL);
143:
144: MALLOC(dp, struct iso_dnode *, sizeof(struct iso_dnode), M_CACHE,
145: M_WAITOK);
146: dp->i_dev = dev;
147: dp->i_number = ino;
148:
149: if (dq = *dpp)
150: dq->d_prev = dp->d_next;
151: dp->d_next = dq;
152: dp->d_prev = dpp;
153: *dpp = dp;
154:
155: return (dp);
156: }
157:
158: void
159: iso_dunmap(device)
160: dev_t device;
161: {
162: struct iso_dnode **dpp, *dp, *dq;
163:
164: for (dpp = idvhashtbl; dpp <= idvhashtbl + idvhash; dpp++) {
165: for (dp = *dpp; dp != NULL; dp = dq)
166: dq = dp->d_next;
167: if (device == dp->i_dev) {
168: if (dq)
169: dq->d_prev = dp->d_prev;
170: *dp->d_prev = dq;
171: FREE(dp, M_CACHE);
172: }
173: }
174: }
175: }
176: #endif
177:
178: /*
179: * Use the device/inum pair to find the incore inode, and return a pointer
180: * to it. If it is in core, but locked, wait for it.
181: */
182: struct vnode *
183: cd9660_ihashget(device, inum, p)
184: dev_t device;
185: ino_t inum;
186: struct proc *p;
187: {
188: register struct iso_node *ip;
189: struct vnode *vp;
190:
191: for (;;)
192: for (ip = isohashtbl[INOHASH(device, inum)];; ip = ip->i_next) {
193: if (ip == NULL)
194: return (NULL);
195: if (inum == ip->i_number && device == ip->i_dev) {
196:
197: // radar 1669467 This is my most dangerous change. I am not waiting for the indoe
198: // lock anymore (ufs doesn't, why should we) and I'm worried because
199: // there is not lock on the hashtable, but there wasn't before so
200: // I'll let it go for now.
201:
202: vp = ITOV(ip);
203: simple_lock(&vp->v_interlock);
204: if (!vget(vp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY, p))
205: return (vp);
206: break;
207: }
208: }
209: /* NOTREACHED */
210: }
211:
212: /*
213: * Insert the inode into the hash table, and return it locked.
214: */
215: void
216: cd9660_ihashins(ip)
217: struct iso_node *ip;
218: {
219: struct iso_node **ipp, *iq;
220: struct proc *p = current_proc();
221:
222: // radar 1669467 another change in the locking - chw
223:
224: /* lock the inode, then put it on the appropriate hash list */
225: lockmgr(&ip->i_lock, LK_EXCLUSIVE, (struct slock *)0, p);
226:
227: ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
228: if ((iq = *ipp))
229: iq->i_prev = &ip->i_next;
230: ip->i_next = iq;
231: ip->i_prev = ipp;
232: *ipp = ip;
233: }
234:
235: /*
236: * Remove the inode from the hash table.
237: */
238: void
239: cd9660_ihashrem(ip)
240: register struct iso_node *ip;
241: {
242: register struct iso_node *iq;
243:
244: if ((iq = ip->i_next))
245: iq->i_prev = ip->i_prev;
246: *ip->i_prev = iq;
247: #if 1 /* was ifdef DIAGNOSTIC */
248: ip->i_next = NULL;
249: ip->i_prev = NULL;
250: #endif
251: }
252:
253: /*
254: * Last reference to an inode, write the inode out and if necessary,
255: * truncate and deallocate the file.
256: */
257: int
258: cd9660_inactive(ap)
259: struct vop_inactive_args /* {
260: struct vnode *a_vp;
261: } */ *ap;
262: {
263: struct vnode *vp = ap->a_vp;
264: register struct iso_node *ip = VTOI(vp);
265: int error = 0;
266:
267: if (prtactive && vp->v_usecount != 0)
268: vprint("cd9660_inactive: pushing active", vp);
269:
270: ip->i_flag = 0;
271:
272: // radar 1669467 We need to unlock the inode here. If we don't panics or hangs will
273: // ensue. Our callers expect us to take care of this.
274:
275: VOP_UNLOCK(vp,0,ap->a_p);
276:
277: /*
278: * If we are done with the inode, reclaim it
279: * so that it can be reused immediately.
280: */
281: if (vp->v_usecount == 0 && ip->inode.iso_mode == 0)
282: vgone(vp);
283:
284: return error;
285: }
286:
287: /*
288: * Reclaim an inode so that it can be used for other purposes.
289: */
290: int
291: cd9660_reclaim(ap)
292: struct vop_reclaim_args /* {
293: struct vnode *a_vp;
294: } */ *ap;
295: {
296: register struct vnode *vp = ap->a_vp;
297: register struct iso_node *ip = VTOI(vp);
298:
299: if (prtactive && vp->v_usecount != 0)
300: vprint("cd9660_reclaim: pushing active", vp);
301: /*
302: * Remove the inode from its hash chain.
303: */
304: cd9660_ihashrem(ip);
305: /*
306: * Purge old data structures associated with the inode.
307: */
308: cache_purge(vp);
309: if (ip->i_devvp) {
310: vrele(ip->i_devvp);
311: ip->i_devvp = 0;
312: }
313: FREE(vp->v_data, M_ISOFSNODE);
314: vp->v_data = NULL;
315: return (0);
316: }
317:
318: /*
319: * File attributes
320: */
321: void
322: cd9660_defattr(isodir, inop, bp)
323: struct iso_directory_record *isodir;
324: struct iso_node *inop;
325: struct buf *bp;
326: {
327: struct buf *bp2 = NULL;
328: struct iso_mnt *imp;
329: struct iso_extended_attributes *ap = NULL;
330: int off;
331:
332: #if 1 // radar 1669467 - make it pretty
333: if ( isonum_711(isodir->flags) & directoryBit ) {
334: #else
335: if (isonum_711(isodir->flags)&2) {
336: #endif // radar 1669467
337: inop->inode.iso_mode = S_IFDIR;
338: /*
339: * If we return 2, fts() will assume there are no subdirectories
340: * (just links for the path and .), so instead we return 1.
341: */
342: inop->inode.iso_links = 1;
343: } else {
344: inop->inode.iso_mode = S_IFREG;
345: inop->inode.iso_links = 1;
346: }
347: if (!bp
348: && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
349: && (off = isonum_711(isodir->ext_attr_length))) {
350: VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
351: &bp2);
352: bp = bp2;
353: }
354: if (bp) {
355: ap = (struct iso_extended_attributes *)bp->b_data;
356:
357: if (isonum_711(ap->version) == 1) {
358: if (!(ap->perm[0]&0x40))
359: inop->inode.iso_mode |= VEXEC >> 6;
360: if (!(ap->perm[0]&0x10))
361: inop->inode.iso_mode |= VREAD >> 6;
362: if (!(ap->perm[0]&4))
363: inop->inode.iso_mode |= VEXEC >> 3;
364: if (!(ap->perm[0]&1))
365: inop->inode.iso_mode |= VREAD >> 3;
366: if (!(ap->perm[1]&0x40))
367: inop->inode.iso_mode |= VEXEC;
368: if (!(ap->perm[1]&0x10))
369: inop->inode.iso_mode |= VREAD;
370: inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
371: inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
372: } else
373: ap = NULL;
374: }
375: if (!ap) {
376: inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6;
377: inop->inode.iso_uid = (uid_t)0;
378: inop->inode.iso_gid = (gid_t)0;
379: }
380: if (bp2)
381: brelse(bp2);
382: }
383:
384: /*
385: * Time stamps
386: */
387: void
388: cd9660_deftstamp(isodir,inop,bp)
389: struct iso_directory_record *isodir;
390: struct iso_node *inop;
391: struct buf *bp;
392: {
393: struct buf *bp2 = NULL;
394: struct iso_mnt *imp;
395: struct iso_extended_attributes *ap = NULL;
396: int off;
397:
398: if (!bp
399: && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
400: && (off = isonum_711(isodir->ext_attr_length)))
401: {
402: VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, &bp2);
403: bp = bp2;
404: }
405: if (bp) {
406: ap = (struct iso_extended_attributes *)bp->b_data;
407:
408: if (isonum_711(ap->version) == 1) {
409: if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
410: cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
411: if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
412: inop->inode.iso_ctime = inop->inode.iso_atime;
413: if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
414: inop->inode.iso_mtime = inop->inode.iso_ctime;
415: } else
416: ap = NULL;
417: }
418: if (!ap) {
419: cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime);
420: inop->inode.iso_atime = inop->inode.iso_ctime;
421: inop->inode.iso_mtime = inop->inode.iso_ctime;
422: }
423: if (bp2)
424: brelse(bp2);
425: }
426:
427: int
428: cd9660_tstamp_conv7(pi,pu)
429: u_char *pi;
430: struct timespec *pu;
431: {
432: int crtime, days;
433: int y, m, d, hour, minute, second, tz;
434:
435: y = pi[0] + 1900;
436: m = pi[1];
437: d = pi[2];
438: hour = pi[3];
439: minute = pi[4];
440: second = pi[5];
441: tz = pi[6];
442:
443: if (y < 1970) {
444: pu->tv_sec = 0;
445: pu->tv_nsec = 0;
446: return 0;
447: } else {
448: #ifdef ORIGINAL
449: /* computes day number relative to Sept. 19th,1989 */
450: /* don't even *THINK* about changing formula. It works! */
451: days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
452: #else
453: /*
454: * Changed :-) to make it relative to Jan. 1st, 1970
455: * and to disambiguate negative division
456: */
457: days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
458: #endif
459: crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
460:
461: /* timezone offset is unreliable on some disks */
462: if (-48 <= tz && tz <= 52)
463: crtime -= tz * 15 * 60;
464: }
465: pu->tv_sec = crtime;
466: pu->tv_nsec = 0;
467: return 1;
468: }
469:
470: static u_int
471: cd9660_chars2ui(begin,len)
472: u_char *begin;
473: int len;
474: {
475: u_int rc;
476:
477: for (rc = 0; --len >= 0;) {
478: rc *= 10;
479: rc += *begin++ - '0';
480: }
481: return rc;
482: }
483:
484: int
485: cd9660_tstamp_conv17(pi,pu)
486: u_char *pi;
487: struct timespec *pu;
488: {
489: u_char buf[7];
490:
491: /* year:"0001"-"9999" -> -1900 */
492: buf[0] = cd9660_chars2ui(pi,4) - 1900;
493:
494: /* month: " 1"-"12" -> 1 - 12 */
495: buf[1] = cd9660_chars2ui(pi + 4,2);
496:
497: /* day: " 1"-"31" -> 1 - 31 */
498: buf[2] = cd9660_chars2ui(pi + 6,2);
499:
500: /* hour: " 0"-"23" -> 0 - 23 */
501: buf[3] = cd9660_chars2ui(pi + 8,2);
502:
503: /* minute:" 0"-"59" -> 0 - 59 */
504: buf[4] = cd9660_chars2ui(pi + 10,2);
505:
506: /* second:" 0"-"59" -> 0 - 59 */
507: buf[5] = cd9660_chars2ui(pi + 12,2);
508:
509: /* difference of GMT */
510: buf[6] = pi[16];
511:
512: return cd9660_tstamp_conv7(buf,pu);
513: }
514:
515: ino_t
516: isodirino(isodir, imp)
517: struct iso_directory_record *isodir;
518: struct iso_mnt *imp;
519: {
520: ino_t ino;
521:
522: ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length))
523: << imp->im_bshift;
524: return (ino);
525: }
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