2 * Copyright (c) 1982, 1986, 1989, 1994, 1995
3 * The Regents of the University of California. All rights reserved.
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).
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11 * modification, are permitted provided that the following conditions
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20 * This product includes software developed by the University of
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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 $
40 * $DragonFly: src/sys/vfs/isofs/cd9660/cd9660_node.c,v 1.2 2003/06/17 04:28:41 dillon Exp $
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/mount.h>
48 #include <sys/vnode.h>
49 #include <sys/malloc.h>
52 #include <isofs/cd9660/iso.h>
53 #include <isofs/cd9660/cd9660_node.h>
54 #include <isofs/cd9660/cd9660_mount.h>
57 * Structures associated with iso_node caching.
59 static struct iso_node **isohashtbl;
60 static u_long isohash;
61 #define INOHASH(device, inum) ((minor(device) + ((inum)>>12)) & isohash)
62 #ifndef NULL_SIMPLELOCKS
63 static struct simplelock cd9660_ihash_slock;
66 static void cd9660_ihashrem __P((struct iso_node *));
67 static unsigned cd9660_chars2ui __P((unsigned char *begin, int len));
70 * Initialize hash links for inodes and dnodes.
77 isohashtbl = hashinit(desiredvnodes, M_ISOFSMNT, &isohash);
78 simple_lock_init(&cd9660_ihash_slock);
87 if (isohashtbl != NULL)
88 free(isohashtbl, M_ISOFSMNT);
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.
98 cd9660_ihashget(dev, inum)
102 struct proc *p = curproc; /* XXX */
107 simple_lock(&cd9660_ihash_slock);
108 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
109 if (inum == ip->i_number && dev == ip->i_dev) {
111 simple_lock(&vp->v_interlock);
112 simple_unlock(&cd9660_ihash_slock);
113 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p))
118 simple_unlock(&cd9660_ihash_slock);
123 * Insert the inode into the hash table, and return it locked.
129 struct proc *p = curproc; /* XXX */
130 struct iso_node **ipp, *iq;
132 simple_lock(&cd9660_ihash_slock);
133 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
134 if ((iq = *ipp) != NULL)
135 iq->i_prev = &ip->i_next;
139 simple_unlock(&cd9660_ihash_slock);
141 lockmgr(&ip->i_lock, LK_EXCLUSIVE, (struct simplelock *)0, p);
145 * Remove the inode from the hash table.
149 register struct iso_node *ip;
151 register struct iso_node *iq;
153 simple_lock(&cd9660_ihash_slock);
154 if ((iq = ip->i_next) != NULL)
155 iq->i_prev = ip->i_prev;
161 simple_unlock(&cd9660_ihash_slock);
165 * Last reference to an inode, write the inode out and if necessary,
166 * truncate and deallocate the file.
170 struct vop_inactive_args /* {
175 struct vnode *vp = ap->a_vp;
176 struct proc *p = ap->a_p;
177 register struct iso_node *ip = VTOI(vp);
180 if (prtactive && vp->v_usecount != 0)
181 vprint("cd9660_inactive: pushing active", vp);
184 VOP_UNLOCK(vp, 0, p);
186 * If we are done with the inode, reclaim it
187 * so that it can be reused immediately.
189 if (ip->inode.iso_mode == 0)
190 vrecycle(vp, (struct simplelock *)0, p);
195 * Reclaim an inode so that it can be used for other purposes.
199 struct vop_reclaim_args /* {
204 register struct vnode *vp = ap->a_vp;
205 register struct iso_node *ip = VTOI(vp);
207 if (prtactive && vp->v_usecount != 0)
208 vprint("cd9660_reclaim: pushing active", vp);
210 * Remove the inode from its hash chain.
214 * Purge old data structures associated with the inode.
221 FREE(vp->v_data, M_ISOFSNODE);
230 cd9660_defattr(isodir, inop, bp, ftype)
231 struct iso_directory_record *isodir;
232 struct iso_node *inop;
234 enum ISO_FTYPE ftype;
236 struct buf *bp2 = NULL;
238 struct iso_extended_attributes *ap = NULL;
241 /* high sierra does not have timezone data, flag is one byte ahead */
242 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
243 &isodir->date[6]: isodir->flags)&2) {
244 inop->inode.iso_mode = S_IFDIR;
246 * If we return 2, fts() will assume there are no subdirectories
247 * (just links for the path and .), so instead we return 1.
249 inop->inode.iso_links = 1;
251 inop->inode.iso_mode = S_IFREG;
252 inop->inode.iso_links = 1;
255 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
256 && (off = isonum_711(isodir->ext_attr_length))) {
257 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
262 ap = (struct iso_extended_attributes *)bp->b_data;
264 if (isonum_711(ap->version) == 1) {
265 if (!(ap->perm[0]&0x40))
266 inop->inode.iso_mode |= VEXEC >> 6;
267 if (!(ap->perm[0]&0x10))
268 inop->inode.iso_mode |= VREAD >> 6;
269 if (!(ap->perm[0]&4))
270 inop->inode.iso_mode |= VEXEC >> 3;
271 if (!(ap->perm[0]&1))
272 inop->inode.iso_mode |= VREAD >> 3;
273 if (!(ap->perm[1]&0x40))
274 inop->inode.iso_mode |= VEXEC;
275 if (!(ap->perm[1]&0x10))
276 inop->inode.iso_mode |= VREAD;
277 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
278 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
283 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6;
284 inop->inode.iso_uid = (uid_t)0;
285 inop->inode.iso_gid = (gid_t)0;
295 cd9660_deftstamp(isodir,inop,bp,ftype)
296 struct iso_directory_record *isodir;
297 struct iso_node *inop;
299 enum ISO_FTYPE ftype;
301 struct buf *bp2 = NULL;
303 struct iso_extended_attributes *ap = NULL;
307 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
308 && (off = isonum_711(isodir->ext_attr_length))) {
309 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
314 ap = (struct iso_extended_attributes *)bp->b_data;
316 if (ftype != ISO_FTYPE_HIGH_SIERRA
317 && isonum_711(ap->version) == 1) {
318 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
319 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
320 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
321 inop->inode.iso_ctime = inop->inode.iso_atime;
322 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
323 inop->inode.iso_mtime = inop->inode.iso_ctime;
328 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
329 inop->inode.iso_atime = inop->inode.iso_ctime;
330 inop->inode.iso_mtime = inop->inode.iso_ctime;
337 cd9660_tstamp_conv7(pi,pu,ftype)
340 enum ISO_FTYPE ftype;
343 int y, m, d, hour, minute, second, tz;
351 if(ftype != ISO_FTYPE_HIGH_SIERRA)
354 /* original high sierra misses timezone data */
363 /* computes day number relative to Sept. 19th,1989 */
364 /* don't even *THINK* about changing formula. It works! */
365 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
368 * Changed :-) to make it relative to Jan. 1st, 1970
369 * and to disambiguate negative division
371 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
373 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
375 /* timezone offset is unreliable on some disks */
376 if (-48 <= tz && tz <= 52)
377 crtime -= tz * 15 * 60;
385 cd9660_chars2ui(begin,len)
391 for (rc = 0; --len >= 0;) {
393 rc += *begin++ - '0';
399 cd9660_tstamp_conv17(pi,pu)
405 /* year:"0001"-"9999" -> -1900 */
406 buf[0] = cd9660_chars2ui(pi,4) - 1900;
408 /* month: " 1"-"12" -> 1 - 12 */
409 buf[1] = cd9660_chars2ui(pi + 4,2);
411 /* day: " 1"-"31" -> 1 - 31 */
412 buf[2] = cd9660_chars2ui(pi + 6,2);
414 /* hour: " 0"-"23" -> 0 - 23 */
415 buf[3] = cd9660_chars2ui(pi + 8,2);
417 /* minute:" 0"-"59" -> 0 - 59 */
418 buf[4] = cd9660_chars2ui(pi + 10,2);
420 /* second:" 0"-"59" -> 0 - 59 */
421 buf[5] = cd9660_chars2ui(pi + 12,2);
423 /* difference of GMT */
426 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
430 isodirino(isodir, imp)
431 struct iso_directory_record *isodir;
436 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length))