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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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 $
36 * $DragonFly: src/sys/vfs/isofs/cd9660/cd9660_node.c,v 1.21 2007/05/06 19:23:34 dillon Exp $
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/mount.h>
44 #include <sys/vnode.h>
45 #include <sys/malloc.h>
49 #include "cd9660_node.h"
50 #include "cd9660_mount.h"
52 #define CD9660_HASH_SIZE_LIMIT 8192
55 * Structures associated with iso_node caching.
57 static struct iso_node **isohashtbl;
58 static u_long isohash;
59 #define INOHASH(device, inum) ((minor(device) + ((inum)>>12)) & isohash)
60 #ifndef NULL_SIMPLELOCKS
61 static struct lwkt_token cd9660_ihash_token;
64 static void cd9660_ihashrem (struct iso_node *);
65 static unsigned cd9660_chars2ui (unsigned char *begin, int len);
68 * Initialize hash links for inodes and dnodes. CDs and DVDs are small
69 * and slow compared to hard disks, there is no need to have a huge hash
70 * table so the size is capped at CD9660_HASH_SIZE_LIMIT.
73 cd9660_init(struct vfsconf *vfsp)
77 if ((hlimit = desiredvnodes) < CD9660_HASH_SIZE_LIMIT)
78 hlimit = CD9660_HASH_SIZE_LIMIT;
81 while (isohash < hlimit)
83 isohashtbl = kmalloc(sizeof(void *) * isohash,
84 M_ISOFSMNT, M_WAITOK|M_ZERO);
86 lwkt_token_init(&cd9660_ihash_token, "cd9660ihash");
91 cd9660_uninit(struct vfsconf *vfsp)
94 if (isohashtbl != NULL)
95 kfree(isohashtbl, M_ISOFSMNT);
101 * Use the device/inum pair to find the incore inode, and return a pointer
102 * to it. If it is in core, but locked, wait for it.
105 cd9660_ihashget(cdev_t dev, ino_t inum)
110 lwkt_gettoken(&cd9660_ihash_token);
112 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
113 if (inum != ip->i_number || dev != ip->i_dev)
116 if (vget(vp, LK_EXCLUSIVE))
119 * We must check to see if the inode has been ripped
120 * out from under us after blocking.
122 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
123 if (inum == ip->i_number && dev == ip->i_dev)
126 if (ip == NULL || ITOV(ip) != vp) {
129 lwkt_reltoken(&cd9660_ihash_token);
132 lwkt_reltoken(&cd9660_ihash_token);
137 * Insert the inode into the hash table, return 0 on success, non-zero
138 * if the inode has already been found to be in the hash table.
141 cd9660_ihashins(struct iso_node *ip)
143 struct iso_node **ipp, *iq;
145 lwkt_gettoken(&cd9660_ihash_token);
146 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
147 while ((iq = *ipp) != NULL) {
148 if (iq->i_dev == ip->i_dev && iq->i_number == ip->i_number) {
149 lwkt_reltoken(&cd9660_ihash_token);
156 lwkt_reltoken(&cd9660_ihash_token);
161 * Remove the inode from the hash table.
164 cd9660_ihashrem(struct iso_node *ip)
166 struct iso_node **ipp, *iq;
168 lwkt_gettoken(&cd9660_ihash_token);
169 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
170 while ((iq = *ipp) != NULL) {
178 lwkt_reltoken(&cd9660_ihash_token);
182 * Last reference to an inode, write the inode out and if necessary,
183 * truncate and deallocate the file.
185 * cd9660_inactive(struct vnode *a_vp)
188 cd9660_inactive(struct vop_inactive_args *ap)
190 struct vnode *vp = ap->a_vp;
191 struct iso_node *ip = VTOI(vp);
194 if (prtactive && VREFCNT(vp) > 1)
195 vprint("cd9660_inactive: pushing active", vp);
200 * If we are done with the inode, reclaim it
201 * so that it can be reused immediately.
203 if (ip == NULL || ip->inode.iso_mode == 0)
209 * Reclaim an inode so that it can be used for other purposes.
211 * cd9660_reclaim(struct vnode *a_vp, struct proc *a_p)
214 cd9660_reclaim(struct vop_reclaim_args *ap)
216 struct vnode *vp = ap->a_vp;
217 struct iso_node *ip = VTOI(vp);
219 if (prtactive && VREFCNT(vp) > 1)
220 vprint("cd9660_reclaim: pushing active", vp);
222 * Remove the inode from its hash chain.
231 kfree(ip, M_ISOFSNODE);
240 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop,
241 struct buf *bp, enum ISO_FTYPE ftype)
243 struct buf *bp2 = NULL;
245 struct iso_extended_attributes *ap = NULL;
248 /* high sierra does not have timezone data, flag is one byte ahead */
249 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
250 &isodir->date[6]: isodir->flags)&2) {
251 inop->inode.iso_mode = S_IFDIR;
253 * If we return 2, fts() will assume there are no subdirectories
254 * (just links for the path and .), so instead we return 1.
256 inop->inode.iso_links = 1;
258 inop->inode.iso_mode = S_IFREG;
259 inop->inode.iso_links = 1;
262 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
263 && (off = isonum_711(isodir->ext_attr_length))) {
264 cd9660_devblkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
269 ap = (struct iso_extended_attributes *)bp->b_data;
271 if (isonum_711(ap->version) == 1) {
272 if (!(ap->perm[0]&0x40))
273 inop->inode.iso_mode |= VEXEC >> 6;
274 if (!(ap->perm[0]&0x10))
275 inop->inode.iso_mode |= VREAD >> 6;
276 if (!(ap->perm[0]&4))
277 inop->inode.iso_mode |= VEXEC >> 3;
278 if (!(ap->perm[0]&1))
279 inop->inode.iso_mode |= VREAD >> 3;
280 if (!(ap->perm[1]&0x40))
281 inop->inode.iso_mode |= VEXEC;
282 if (!(ap->perm[1]&0x10))
283 inop->inode.iso_mode |= VREAD;
284 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
285 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
290 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6;
291 inop->inode.iso_uid = (uid_t)0;
292 inop->inode.iso_gid = (gid_t)0;
302 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop,
303 struct buf *bp, enum ISO_FTYPE ftype)
305 struct buf *bp2 = NULL;
307 struct iso_extended_attributes *ap = NULL;
311 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
312 && (off = isonum_711(isodir->ext_attr_length))) {
313 cd9660_devblkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
318 ap = (struct iso_extended_attributes *)bp->b_data;
320 if (ftype != ISO_FTYPE_HIGH_SIERRA
321 && isonum_711(ap->version) == 1) {
322 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
323 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
324 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
325 inop->inode.iso_ctime = inop->inode.iso_atime;
326 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
327 inop->inode.iso_mtime = inop->inode.iso_ctime;
332 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
333 inop->inode.iso_atime = inop->inode.iso_ctime;
334 inop->inode.iso_mtime = inop->inode.iso_ctime;
341 cd9660_tstamp_conv7(u_char *pi, struct timespec *pu, enum ISO_FTYPE ftype)
344 int y, m, d, hour, minute, second, tz;
352 if(ftype != ISO_FTYPE_HIGH_SIERRA)
355 /* original high sierra misses timezone data */
364 /* computes day number relative to Sept. 19th,1989 */
365 /* don't even *THINK* about changing formula. It works! */
366 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
369 * Changed :-) to make it relative to Jan. 1st, 1970
370 * and to disambiguate negative division
372 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
374 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
376 /* timezone offset is unreliable on some disks */
377 if (-48 <= tz && tz <= 52)
378 crtime -= tz * 15 * 60;
386 cd9660_chars2ui(u_char *begin, int len)
390 for (rc = 0; --len >= 0;) {
392 rc += *begin++ - '0';
398 cd9660_tstamp_conv17(u_char *pi, struct timespec *pu)
402 /* year:"0001"-"9999" -> -1900 */
403 buf[0] = cd9660_chars2ui(pi,4) - 1900;
405 /* month: " 1"-"12" -> 1 - 12 */
406 buf[1] = cd9660_chars2ui(pi + 4,2);
408 /* day: " 1"-"31" -> 1 - 31 */
409 buf[2] = cd9660_chars2ui(pi + 6,2);
411 /* hour: " 0"-"23" -> 0 - 23 */
412 buf[3] = cd9660_chars2ui(pi + 8,2);
414 /* minute:" 0"-"59" -> 0 - 59 */
415 buf[4] = cd9660_chars2ui(pi + 10,2);
417 /* second:" 0"-"59" -> 0 - 59 */
418 buf[5] = cd9660_chars2ui(pi + 12,2);
420 /* difference of GMT */
423 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
427 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp)
431 ino = (ino_t)(isonum_733(isodir->extent) +
432 isonum_711(isodir->ext_attr_length)) << imp->im_bshift;