Annotation of sys/isofs/cd9660/cd9660_node.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: cd9660_node.c,v 1.19 2007/06/01 23:47:55 deraadt Exp $ */
2: /* $NetBSD: cd9660_node.c,v 1.17 1997/05/05 07:13:57 mycroft Exp $ */
3:
4: /*-
5: * Copyright (c) 1982, 1986, 1989, 1994
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley
9: * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension
10: * Support code is derived from software contributed to Berkeley
11: * by Atsushi Murai (amurai@spec.co.jp).
12: *
13: * Redistribution and use in source and binary forms, with or without
14: * modification, are permitted provided that the following conditions
15: * are met:
16: * 1. Redistributions of source code must retain the above copyright
17: * notice, this list of conditions and the following disclaimer.
18: * 2. Redistributions in binary form must reproduce the above copyright
19: * notice, this list of conditions and the following disclaimer in the
20: * documentation and/or other materials provided with the distribution.
21: * 3. Neither the name of the University nor the names of its contributors
22: * may be used to endorse or promote products derived from this software
23: * without specific prior written permission.
24: *
25: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35: * SUCH DAMAGE.
36: *
37: * @(#)cd9660_node.c 8.5 (Berkeley) 12/5/94
38: */
39:
40: #include <sys/param.h>
41: #include <sys/systm.h>
42: #include <sys/mount.h>
43: #include <sys/proc.h>
44: #include <sys/file.h>
45: #include <sys/buf.h>
46: #include <sys/vnode.h>
47: #include <sys/namei.h>
48: #include <sys/kernel.h>
49: #include <sys/malloc.h>
50: #include <sys/stat.h>
51:
52: #include <isofs/cd9660/iso.h>
53: #include <isofs/cd9660/cd9660_extern.h>
54: #include <isofs/cd9660/cd9660_node.h>
55: #include <isofs/cd9660/iso_rrip.h>
56:
57: /*
58: * Structures associated with iso_node caching.
59: */
60: struct iso_node **isohashtbl;
61: u_long isohash;
62: #define INOHASH(device, inum) (((device) + ((inum)>>12)) & isohash)
63: struct simplelock cd9660_ihash_slock;
64:
65: #ifdef ISODEVMAP
66: struct iso_node **idvhashtbl;
67: u_long idvhash;
68: #define DNOHASH(device, inum) (((device) + ((inum)>>12)) & idvhash)
69: #endif
70:
71: extern int prtactive; /* 1 => print out reclaim of active vnodes */
72:
73: static u_int cd9660_chars2ui(u_char *, int);
74:
75: /*
76: * Initialize hash links for inodes and dnodes.
77: */
78: int
79: cd9660_init(vfsp)
80: struct vfsconf *vfsp;
81: {
82:
83: isohashtbl = hashinit(desiredvnodes, M_ISOFSMNT, M_WAITOK, &isohash);
84: simple_lock_init(&cd9660_ihash_slock);
85: #ifdef ISODEVMAP
86: idvhashtbl = hashinit(desiredvnodes / 8, M_ISOFSMNT, M_WAITOK, &idvhash);
87: #endif
88: return (0);
89: }
90:
91: #ifdef ISODEVMAP
92: /*
93: * Enter a new node into the device hash list
94: */
95: struct iso_dnode *
96: iso_dmap(device, inum, create)
97: dev_t device;
98: ino_t inum;
99: int create;
100: {
101: register struct iso_dnode **dpp, *dp, *dq;
102:
103: dpp = &idvhashtbl[DNOHASH(device, inum)];
104: for (dp = *dpp;; dp = dp->d_next) {
105: if (dp == NULL)
106: return (NULL);
107: if (inum == dp->i_number && device == dp->i_dev)
108: return (dp);
109: }
110:
111: if (!create)
112: return (NULL);
113:
114: MALLOC(dp, struct iso_dnode *, sizeof(struct iso_dnode), M_CACHE,
115: M_WAITOK);
116: dp->i_dev = dev;
117: dp->i_number = ino;
118:
119: if (dq = *dpp)
120: dq->d_prev = dp->d_next;
121: dp->d_next = dq;
122: dp->d_prev = dpp;
123: *dpp = dp;
124:
125: return (dp);
126: }
127:
128: void
129: iso_dunmap(device)
130: dev_t device;
131: {
132: struct iso_dnode **dpp, *dp, *dq;
133:
134: for (dpp = idvhashtbl; dpp <= idvhashtbl + idvhash; dpp++) {
135: for (dp = *dpp; dp != NULL; dp = dq) {
136: dq = dp->d_next;
137: if (device == dp->i_dev) {
138: if (dq)
139: dq->d_prev = dp->d_prev;
140: *dp->d_prev = dq;
141: FREE(dp, M_CACHE);
142: }
143: }
144: }
145: }
146: #endif
147:
148: /*
149: * Use the device/inum pair to find the incore inode, and return a pointer
150: * to it. If it is in core, but locked, wait for it.
151: */
152: struct vnode *
153: cd9660_ihashget(dev, inum)
154: dev_t dev;
155: ino_t inum;
156: {
157: struct proc *p = curproc; /* XXX */
158: struct iso_node *ip;
159: struct vnode *vp;
160:
161: loop:
162: simple_lock(&cd9660_ihash_slock);
163: for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
164: if (inum == ip->i_number && dev == ip->i_dev) {
165: vp = ITOV(ip);
166: simple_unlock(&cd9660_ihash_slock);
167: if (vget(vp, LK_EXCLUSIVE, p))
168: goto loop;
169: return (vp);
170: }
171: }
172: simple_unlock(&cd9660_ihash_slock);
173: return (NULL);
174: }
175:
176: /*
177: * Insert the inode into the hash table, and return it locked.
178: */
179: int
180: cd9660_ihashins(ip)
181: struct iso_node *ip;
182: {
183: struct iso_node **ipp, *iq;
184:
185: simple_lock(&cd9660_ihash_slock);
186: ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
187:
188: for (iq = *ipp; iq; iq = iq->i_next) {
189: if (iq->i_dev == ip->i_dev &&
190: iq->i_number == ip->i_number)
191: return (EEXIST);
192: }
193:
194: if ((iq = *ipp) != NULL)
195: iq->i_prev = &ip->i_next;
196: ip->i_next = iq;
197: ip->i_prev = ipp;
198: *ipp = ip;
199: simple_unlock(&cd9660_ihash_slock);
200:
201: lockmgr(&ip->i_lock, LK_EXCLUSIVE, NULL);
202:
203: return (0);
204: }
205:
206: /*
207: * Remove the inode from the hash table.
208: */
209: void
210: cd9660_ihashrem(ip)
211: register struct iso_node *ip;
212: {
213: register struct iso_node *iq;
214:
215: if (ip->i_prev == NULL)
216: return;
217:
218: simple_lock(&cd9660_ihash_slock);
219: if ((iq = ip->i_next) != NULL)
220: iq->i_prev = ip->i_prev;
221: *ip->i_prev = iq;
222: #ifdef DIAGNOSTIC
223: ip->i_next = NULL;
224: ip->i_prev = NULL;
225: #endif
226: simple_unlock(&cd9660_ihash_slock);
227: }
228:
229: /*
230: * Last reference to an inode, write the inode out and if necessary,
231: * truncate and deallocate the file.
232: */
233: int
234: cd9660_inactive(v)
235: void *v;
236: {
237: struct vop_inactive_args *ap = v;
238: struct vnode *vp = ap->a_vp;
239: struct proc *p = ap->a_p;
240: register struct iso_node *ip = VTOI(vp);
241: int error = 0;
242:
243: #ifdef DIAGNOSTIC
244: if (prtactive && vp->v_usecount != 0)
245: vprint("cd9660_inactive: pushing active", vp);
246: #endif
247:
248: ip->i_flag = 0;
249: VOP_UNLOCK(vp, 0, p);
250: /*
251: * If we are done with the inode, reclaim it
252: * so that it can be reused immediately.
253: */
254: if (ip->inode.iso_mode == 0)
255: vrecycle(vp, p);
256:
257: return (error);
258: }
259:
260: /*
261: * Reclaim an inode so that it can be used for other purposes.
262: */
263: int
264: cd9660_reclaim(v)
265: void *v;
266: {
267: struct vop_reclaim_args *ap = v;
268: register struct vnode *vp = ap->a_vp;
269: register struct iso_node *ip = VTOI(vp);
270:
271: #ifdef DIAGNOSTIC
272: if (prtactive && vp->v_usecount != 0)
273: vprint("cd9660_reclaim: pushing active", vp);
274: #endif
275:
276: /*
277: * Remove the inode from its hash chain.
278: */
279: cd9660_ihashrem(ip);
280: /*
281: * Purge old data structures associated with the inode.
282: */
283: cache_purge(vp);
284: if (ip->i_devvp) {
285: vrele(ip->i_devvp);
286: ip->i_devvp = 0;
287: }
288: FREE(vp->v_data, M_ISOFSNODE);
289: vp->v_data = NULL;
290: return (0);
291: }
292:
293: /*
294: * File attributes
295: */
296: void
297: cd9660_defattr(isodir, inop, bp)
298: struct iso_directory_record *isodir;
299: struct iso_node *inop;
300: struct buf *bp;
301: {
302: struct buf *bp2 = NULL;
303: struct iso_mnt *imp;
304: struct iso_extended_attributes *ap = NULL;
305: int off;
306:
307: if (isonum_711(isodir->flags)&2) {
308: inop->inode.iso_mode = S_IFDIR;
309: /*
310: * If we return 2, fts() will assume there are no subdirectories
311: * (just links for the path and .), so instead we return 1.
312: */
313: inop->inode.iso_links = 1;
314: } else {
315: inop->inode.iso_mode = S_IFREG;
316: inop->inode.iso_links = 1;
317: }
318: if (!bp
319: && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
320: && (off = isonum_711(isodir->ext_attr_length))) {
321: cd9660_bufatoff(inop, (off_t)-(off << imp->im_bshift), NULL,
322: &bp2);
323: bp = bp2;
324: }
325: if (bp) {
326: ap = (struct iso_extended_attributes *)bp->b_data;
327:
328: if (isonum_711(ap->version) == 1) {
329: if (!(ap->perm[1]&0x10))
330: inop->inode.iso_mode |= S_IRUSR;
331: if (!(ap->perm[1]&0x40))
332: inop->inode.iso_mode |= S_IXUSR;
333: if (!(ap->perm[0]&0x01))
334: inop->inode.iso_mode |= S_IRGRP;
335: if (!(ap->perm[0]&0x04))
336: inop->inode.iso_mode |= S_IXGRP;
337: if (!(ap->perm[0]&0x10))
338: inop->inode.iso_mode |= S_IROTH;
339: if (!(ap->perm[0]&0x40))
340: inop->inode.iso_mode |= S_IXOTH;
341: inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
342: inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
343: } else
344: ap = NULL;
345: }
346: if (!ap) {
347: inop->inode.iso_mode |=
348: S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
349: inop->inode.iso_uid = (uid_t)0;
350: inop->inode.iso_gid = (gid_t)0;
351: }
352: if (bp2)
353: brelse(bp2);
354: }
355:
356: /*
357: * Time stamps
358: */
359: void
360: cd9660_deftstamp(isodir,inop,bp)
361: struct iso_directory_record *isodir;
362: struct iso_node *inop;
363: struct buf *bp;
364: {
365: struct buf *bp2 = NULL;
366: struct iso_mnt *imp;
367: struct iso_extended_attributes *ap = NULL;
368: int off;
369:
370: if (!bp
371: && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
372: && (off = isonum_711(isodir->ext_attr_length))) {
373: cd9660_bufatoff(inop, (off_t)-(off << imp->im_bshift), NULL,
374: &bp2);
375: bp = bp2;
376: }
377: if (bp) {
378: ap = (struct iso_extended_attributes *)bp->b_data;
379:
380: if (isonum_711(ap->version) == 1) {
381: if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
382: cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
383: if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
384: inop->inode.iso_ctime = inop->inode.iso_atime;
385: if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
386: inop->inode.iso_mtime = inop->inode.iso_ctime;
387: } else
388: ap = NULL;
389: }
390: if (!ap) {
391: cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime);
392: inop->inode.iso_atime = inop->inode.iso_ctime;
393: inop->inode.iso_mtime = inop->inode.iso_ctime;
394: }
395: if (bp2)
396: brelse(bp2);
397: }
398:
399: int
400: cd9660_tstamp_conv7(pi,pu)
401: u_char *pi;
402: struct timespec *pu;
403: {
404: int crtime, days;
405: int y, m, d, hour, minute, second;
406: signed char tz;
407:
408: y = pi[0] + 1900;
409: m = pi[1];
410: d = pi[2];
411: hour = pi[3];
412: minute = pi[4];
413: second = pi[5];
414: tz = (signed char) pi[6];
415:
416: if (y < 1970) {
417: pu->tv_sec = 0;
418: pu->tv_nsec = 0;
419: return (0);
420: } else {
421: #ifdef ORIGINAL
422: /* computes day number relative to Sept. 19th,1989 */
423: /* don't even *THINK* about changing formula. It works! */
424: days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
425: #else
426: /*
427: * Changed :-) to make it relative to Jan. 1st, 1970
428: * and to disambiguate negative division
429: */
430: days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
431: #endif
432: crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
433:
434: /* timezone offset is unreliable on some disks */
435: if (-48 <= tz && tz <= 52)
436: crtime -= tz * 15 * 60;
437: }
438: pu->tv_sec = crtime;
439: pu->tv_nsec = 0;
440: return (1);
441: }
442:
443: static u_int
444: cd9660_chars2ui(begin,len)
445: u_char *begin;
446: int len;
447: {
448: u_int rc;
449:
450: for (rc = 0; --len >= 0;) {
451: rc *= 10;
452: rc += *begin++ - '0';
453: }
454: return (rc);
455: }
456:
457: int
458: cd9660_tstamp_conv17(pi,pu)
459: u_char *pi;
460: struct timespec *pu;
461: {
462: u_char buf[7];
463:
464: /* year:"0001"-"9999" -> -1900 */
465: buf[0] = cd9660_chars2ui(pi,4) - 1900;
466:
467: /* month: " 1"-"12" -> 1 - 12 */
468: buf[1] = cd9660_chars2ui(pi + 4,2);
469:
470: /* day: " 1"-"31" -> 1 - 31 */
471: buf[2] = cd9660_chars2ui(pi + 6,2);
472:
473: /* hour: " 0"-"23" -> 0 - 23 */
474: buf[3] = cd9660_chars2ui(pi + 8,2);
475:
476: /* minute:" 0"-"59" -> 0 - 59 */
477: buf[4] = cd9660_chars2ui(pi + 10,2);
478:
479: /* second:" 0"-"59" -> 0 - 59 */
480: buf[5] = cd9660_chars2ui(pi + 12,2);
481:
482: /* difference of GMT */
483: buf[6] = pi[16];
484:
485: return (cd9660_tstamp_conv7(buf,pu));
486: }
487:
488: ino_t
489: isodirino(isodir, imp)
490: struct iso_directory_record *isodir;
491: struct iso_mnt *imp;
492: {
493: ino_t ino;
494:
495: ino = (isonum_733(isodir->extent) +
496: isonum_711(isodir->ext_attr_length)) << imp->im_bshift;
497: return (ino);
498: }
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