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 1.21 2007/05/06 19:23:34 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>
53 #include "cd9660_node.h"
54 #include "cd9660_mount.h"
56 #define CD9660_HASH_SIZE_LIMIT 8192
59 * Structures associated with iso_node caching.
61 static struct iso_node **isohashtbl;
62 static u_long isohash;
63 #define INOHASH(device, inum) ((minor(device) + ((inum)>>12)) & isohash)
64 #ifndef NULL_SIMPLELOCKS
65 static struct lwkt_token cd9660_ihash_token;
68 static void cd9660_ihashrem (struct iso_node *);
69 static unsigned cd9660_chars2ui (unsigned char *begin, int len);
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.
77 cd9660_init(struct vfsconf *vfsp)
81 if ((hlimit = desiredvnodes) < CD9660_HASH_SIZE_LIMIT)
82 hlimit = CD9660_HASH_SIZE_LIMIT;
85 while (isohash < hlimit)
87 isohashtbl = kmalloc(sizeof(void *) * isohash,
88 M_ISOFSMNT, M_WAITOK|M_ZERO);
90 lwkt_token_init(&cd9660_ihash_token);
95 cd9660_uninit(struct vfsconf *vfsp)
98 if (isohashtbl != NULL)
99 kfree(isohashtbl, M_ISOFSMNT);
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.
109 cd9660_ihashget(cdev_t dev, ino_t inum)
115 lwkt_gettoken(&ilock, &cd9660_ihash_token);
117 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
118 if (inum != ip->i_number || dev != ip->i_dev)
121 if (vget(vp, LK_EXCLUSIVE))
124 * We must check to see if the inode has been ripped
125 * out from under us after blocking.
127 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
128 if (inum == ip->i_number && dev == ip->i_dev)
131 if (ip == NULL || ITOV(ip) != vp) {
134 lwkt_reltoken(&ilock);
137 lwkt_reltoken(&ilock);
142 * Insert the inode into the hash table, return 0 on success, non-zero
143 * if the inode has already been found to be in the hash table.
146 cd9660_ihashins(struct iso_node *ip)
148 struct iso_node **ipp, *iq;
151 lwkt_gettoken(&ilock, &cd9660_ihash_token);
152 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
153 while ((iq = *ipp) != NULL) {
154 if (iq->i_dev == ip->i_dev && iq->i_number == ip->i_number) {
155 lwkt_reltoken(&ilock);
162 lwkt_reltoken(&ilock);
167 * Remove the inode from the hash table.
170 cd9660_ihashrem(struct iso_node *ip)
172 struct iso_node **ipp, *iq;
175 lwkt_gettoken(&ilock, &cd9660_ihash_token);
176 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
177 while ((iq = *ipp) != NULL) {
185 lwkt_reltoken(&ilock);
189 * Last reference to an inode, write the inode out and if necessary,
190 * truncate and deallocate the file.
192 * cd9660_inactive(struct vnode *a_vp)
195 cd9660_inactive(struct vop_inactive_args *ap)
197 struct vnode *vp = ap->a_vp;
198 struct iso_node *ip = VTOI(vp);
201 if (prtactive && vp->v_sysref.refcnt > 1)
202 vprint("cd9660_inactive: pushing active", vp);
207 * If we are done with the inode, reclaim it
208 * so that it can be reused immediately.
210 if (ip == NULL || ip->inode.iso_mode == 0)
216 * Reclaim an inode so that it can be used for other purposes.
218 * cd9660_reclaim(struct vnode *a_vp, struct proc *a_p)
221 cd9660_reclaim(struct vop_reclaim_args *ap)
223 struct vnode *vp = ap->a_vp;
224 struct iso_node *ip = VTOI(vp);
226 if (prtactive && vp->v_sysref.refcnt > 1)
227 vprint("cd9660_reclaim: pushing active", vp);
229 * Remove the inode from its hash chain.
238 kfree(ip, M_ISOFSNODE);
247 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop,
248 struct buf *bp, enum ISO_FTYPE ftype)
250 struct buf *bp2 = NULL;
252 struct iso_extended_attributes *ap = NULL;
255 /* high sierra does not have timezone data, flag is one byte ahead */
256 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
257 &isodir->date[6]: isodir->flags)&2) {
258 inop->inode.iso_mode = S_IFDIR;
260 * If we return 2, fts() will assume there are no subdirectories
261 * (just links for the path and .), so instead we return 1.
263 inop->inode.iso_links = 1;
265 inop->inode.iso_mode = S_IFREG;
266 inop->inode.iso_links = 1;
269 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
270 && (off = isonum_711(isodir->ext_attr_length))) {
271 cd9660_devblkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
276 ap = (struct iso_extended_attributes *)bp->b_data;
278 if (isonum_711(ap->version) == 1) {
279 if (!(ap->perm[0]&0x40))
280 inop->inode.iso_mode |= VEXEC >> 6;
281 if (!(ap->perm[0]&0x10))
282 inop->inode.iso_mode |= VREAD >> 6;
283 if (!(ap->perm[0]&4))
284 inop->inode.iso_mode |= VEXEC >> 3;
285 if (!(ap->perm[0]&1))
286 inop->inode.iso_mode |= VREAD >> 3;
287 if (!(ap->perm[1]&0x40))
288 inop->inode.iso_mode |= VEXEC;
289 if (!(ap->perm[1]&0x10))
290 inop->inode.iso_mode |= VREAD;
291 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
292 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
297 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6;
298 inop->inode.iso_uid = (uid_t)0;
299 inop->inode.iso_gid = (gid_t)0;
309 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop,
310 struct buf *bp, enum ISO_FTYPE ftype)
312 struct buf *bp2 = NULL;
314 struct iso_extended_attributes *ap = NULL;
318 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
319 && (off = isonum_711(isodir->ext_attr_length))) {
320 cd9660_devblkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
325 ap = (struct iso_extended_attributes *)bp->b_data;
327 if (ftype != ISO_FTYPE_HIGH_SIERRA
328 && isonum_711(ap->version) == 1) {
329 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
330 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
331 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
332 inop->inode.iso_ctime = inop->inode.iso_atime;
333 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
334 inop->inode.iso_mtime = inop->inode.iso_ctime;
339 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
340 inop->inode.iso_atime = inop->inode.iso_ctime;
341 inop->inode.iso_mtime = inop->inode.iso_ctime;
348 cd9660_tstamp_conv7(u_char *pi, struct timespec *pu, enum ISO_FTYPE ftype)
351 int y, m, d, hour, minute, second, tz;
359 if(ftype != ISO_FTYPE_HIGH_SIERRA)
362 /* original high sierra misses timezone data */
371 /* computes day number relative to Sept. 19th,1989 */
372 /* don't even *THINK* about changing formula. It works! */
373 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
376 * Changed :-) to make it relative to Jan. 1st, 1970
377 * and to disambiguate negative division
379 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
381 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
383 /* timezone offset is unreliable on some disks */
384 if (-48 <= tz && tz <= 52)
385 crtime -= tz * 15 * 60;
393 cd9660_chars2ui(u_char *begin, int len)
397 for (rc = 0; --len >= 0;) {
399 rc += *begin++ - '0';
405 cd9660_tstamp_conv17(u_char *pi, struct timespec *pu)
409 /* year:"0001"-"9999" -> -1900 */
410 buf[0] = cd9660_chars2ui(pi,4) - 1900;
412 /* month: " 1"-"12" -> 1 - 12 */
413 buf[1] = cd9660_chars2ui(pi + 4,2);
415 /* day: " 1"-"31" -> 1 - 31 */
416 buf[2] = cd9660_chars2ui(pi + 6,2);
418 /* hour: " 0"-"23" -> 0 - 23 */
419 buf[3] = cd9660_chars2ui(pi + 8,2);
421 /* minute:" 0"-"59" -> 0 - 59 */
422 buf[4] = cd9660_chars2ui(pi + 10,2);
424 /* second:" 0"-"59" -> 0 - 59 */
425 buf[5] = cd9660_chars2ui(pi + 12,2);
427 /* difference of GMT */
430 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
434 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp)
438 ino = (ino_t)(isonum_733(isodir->extent) +
439 isonum_711(isodir->ext_attr_length)) << imp->im_bshift;