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
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)cd9660_node.c 8.2 (Berkeley) 1/23/94
35 * $FreeBSD: src/sys/isofs/cd9660/cd9660_node.c,v 1.29.2.1 2000/07/08 14:35:56 bp Exp $
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/mount.h>
43 #include <sys/vnode.h>
44 #include <sys/malloc.h>
48 #include "cd9660_node.h"
49 #include "cd9660_mount.h"
51 #define CD9660_HASH_SIZE_LIMIT 8192
54 * Structures associated with iso_node caching.
56 static struct iso_node **isohashtbl;
57 static u_long isohash;
58 #define INOHASH(device, inum) ((minor(device) + ((inum)>>12)) & isohash)
59 #ifndef NULL_SIMPLELOCKS
60 static struct lwkt_token cd9660_ihash_token;
63 static void cd9660_ihashrem(struct iso_node *);
64 static unsigned cd9660_chars2ui(unsigned char *begin, int len);
67 * Initialize hash links for inodes and dnodes. CDs and DVDs are small
68 * and slow compared to hard disks, there is no need to have a huge hash
69 * table so the size is capped at CD9660_HASH_SIZE_LIMIT.
72 cd9660_init(struct vfsconf *vfsp)
76 if ((hlimit = desiredvnodes) < CD9660_HASH_SIZE_LIMIT)
77 hlimit = CD9660_HASH_SIZE_LIMIT;
80 while (isohash < hlimit)
82 isohashtbl = kmalloc(sizeof(void *) * isohash,
83 M_ISOFSMNT, M_WAITOK|M_ZERO);
85 lwkt_token_init(&cd9660_ihash_token, "cd9660ihash");
90 cd9660_uninit(struct vfsconf *vfsp)
93 if (isohashtbl != NULL)
94 kfree(isohashtbl, M_ISOFSMNT);
100 * Use the device/inum pair to find the incore inode, and return a pointer
101 * to it. If it is in core, but locked, wait for it.
104 cd9660_ihashget(cdev_t dev, ino_t inum)
109 lwkt_gettoken(&cd9660_ihash_token);
111 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
112 if (inum != ip->i_number || dev != ip->i_dev)
115 if (vget(vp, LK_EXCLUSIVE))
118 * We must check to see if the inode has been ripped
119 * out from under us after blocking.
121 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
122 if (inum == ip->i_number && dev == ip->i_dev)
125 if (ip == NULL || ITOV(ip) != vp) {
128 lwkt_reltoken(&cd9660_ihash_token);
131 lwkt_reltoken(&cd9660_ihash_token);
136 * Insert the inode into the hash table, return 0 on success, non-zero
137 * if the inode has already been found to be in the hash table.
140 cd9660_ihashins(struct iso_node *ip)
142 struct iso_node **ipp, *iq;
144 lwkt_gettoken(&cd9660_ihash_token);
145 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
146 while ((iq = *ipp) != NULL) {
147 if (iq->i_dev == ip->i_dev && iq->i_number == ip->i_number) {
148 lwkt_reltoken(&cd9660_ihash_token);
155 lwkt_reltoken(&cd9660_ihash_token);
160 * Remove the inode from the hash table.
163 cd9660_ihashrem(struct iso_node *ip)
165 struct iso_node **ipp, *iq;
167 lwkt_gettoken(&cd9660_ihash_token);
168 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
169 while ((iq = *ipp) != NULL) {
177 lwkt_reltoken(&cd9660_ihash_token);
181 * Last reference to an inode, write the inode out and if necessary,
182 * truncate and deallocate the file.
184 * cd9660_inactive(struct vnode *a_vp)
187 cd9660_inactive(struct vop_inactive_args *ap)
189 struct vnode *vp = ap->a_vp;
190 struct iso_node *ip = VTOI(vp);
193 if (prtactive && VREFCNT(vp) > 1)
194 vprint("cd9660_inactive: pushing active", vp);
199 * If we are done with the inode, reclaim it
200 * so that it can be reused immediately.
202 if (ip == NULL || ip->inode.iso_mode == 0)
208 * Reclaim an inode so that it can be used for other purposes.
210 * cd9660_reclaim(struct vnode *a_vp, struct proc *a_p)
213 cd9660_reclaim(struct vop_reclaim_args *ap)
215 struct vnode *vp = ap->a_vp;
216 struct iso_node *ip = VTOI(vp);
218 if (prtactive && VREFCNT(vp) > 1)
219 vprint("cd9660_reclaim: pushing active", vp);
221 * Remove the inode from its hash chain.
230 kfree(ip, M_ISOFSNODE);
239 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop,
240 struct buf *bp, enum ISO_FTYPE ftype)
242 struct buf *bp2 = NULL;
244 struct iso_extended_attributes *ap = NULL;
247 /* high sierra does not have timezone data, flag is one byte ahead */
248 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
249 &isodir->date[6]: isodir->flags)&2) {
250 inop->inode.iso_mode = S_IFDIR;
252 * If we return 2, fts() will assume there are no subdirectories
253 * (just links for the path and .), so instead we return 1.
255 inop->inode.iso_links = 1;
257 inop->inode.iso_mode = S_IFREG;
258 inop->inode.iso_links = 1;
261 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
262 && (off = isonum_711(isodir->ext_attr_length))) {
263 cd9660_devblkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
268 ap = (struct iso_extended_attributes *)bp->b_data;
270 if (isonum_711(ap->version) == 1) {
271 if (!(ap->perm[0]&0x40))
272 inop->inode.iso_mode |= VEXEC >> 6;
273 if (!(ap->perm[0]&0x10))
274 inop->inode.iso_mode |= VREAD >> 6;
275 if (!(ap->perm[0]&4))
276 inop->inode.iso_mode |= VEXEC >> 3;
277 if (!(ap->perm[0]&1))
278 inop->inode.iso_mode |= VREAD >> 3;
279 if (!(ap->perm[1]&0x40))
280 inop->inode.iso_mode |= VEXEC;
281 if (!(ap->perm[1]&0x10))
282 inop->inode.iso_mode |= VREAD;
283 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
284 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
289 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6;
290 inop->inode.iso_uid = (uid_t)0;
291 inop->inode.iso_gid = (gid_t)0;
301 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop,
302 struct buf *bp, enum ISO_FTYPE ftype)
304 struct buf *bp2 = NULL;
306 struct iso_extended_attributes *ap = NULL;
310 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
311 && (off = isonum_711(isodir->ext_attr_length))) {
312 cd9660_devblkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
317 ap = (struct iso_extended_attributes *)bp->b_data;
319 if (ftype != ISO_FTYPE_HIGH_SIERRA
320 && isonum_711(ap->version) == 1) {
321 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
322 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
323 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
324 inop->inode.iso_ctime = inop->inode.iso_atime;
325 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
326 inop->inode.iso_mtime = inop->inode.iso_ctime;
331 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
332 inop->inode.iso_atime = inop->inode.iso_ctime;
333 inop->inode.iso_mtime = inop->inode.iso_ctime;
340 cd9660_tstamp_conv7(u_char *pi, struct timespec *pu, 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(u_char *begin, int len)
389 for (rc = 0; --len >= 0;) {
391 rc += *begin++ - '0';
397 cd9660_tstamp_conv17(u_char *pi, struct timespec *pu)
401 /* year:"0001"-"9999" -> -1900 */
402 buf[0] = cd9660_chars2ui(pi,4) - 1900;
404 /* month: " 1"-"12" -> 1 - 12 */
405 buf[1] = cd9660_chars2ui(pi + 4,2);
407 /* day: " 1"-"31" -> 1 - 31 */
408 buf[2] = cd9660_chars2ui(pi + 6,2);
410 /* hour: " 0"-"23" -> 0 - 23 */
411 buf[3] = cd9660_chars2ui(pi + 8,2);
413 /* minute:" 0"-"59" -> 0 - 59 */
414 buf[4] = cd9660_chars2ui(pi + 10,2);
416 /* second:" 0"-"59" -> 0 - 59 */
417 buf[5] = cd9660_chars2ui(pi + 12,2);
419 /* difference of GMT */
422 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
426 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp)
430 ino = (ino_t)(isonum_733(isodir->extent) +
431 isonum_711(isodir->ext_attr_length)) << imp->im_bshift;