xref: /dragonfly/sys/vfs/isofs/cd9660/cd9660_node.c (revision 43b4d1bd) 
1 /*-
2  * Copyright (c) 1982, 1986, 1989, 1994, 1995
3  *	The Regents of the University of California.  All rights reserved.
4  *
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).
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. All advertising materials mentioning features or use of this software
19  *    must display the following acknowledgement:
20  *	This product includes software developed by the University of
21  *	California, Berkeley and its contributors.
22  * 4. Neither the name of the University nor the names of its contributors
23  *    may be used to endorse or promote products derived from this software
24  *    without specific prior written permission.
25  *
26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36  * SUCH DAMAGE.
37  *
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 1.11 2004/08/28 19:02:15 dillon Exp $
41  */
42 
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/mount.h>
46 #include <sys/proc.h>
47 #include <sys/buf.h>
48 #include <sys/vnode.h>
49 #include <sys/malloc.h>
50 #include <sys/stat.h>
51 
52 #include "iso.h"
53 #include "cd9660_node.h"
54 #include "cd9660_mount.h"
55 
56 /*
57  * Structures associated with iso_node caching.
58  */
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 lwkt_token cd9660_ihash_token;
64 #endif
65 
66 static void cd9660_ihashrem (struct iso_node *);
67 static unsigned	cd9660_chars2ui (unsigned char *begin, int len);
68 
69 /*
70  * Initialize hash links for inodes and dnodes.
71  */
72 int
73 cd9660_init(struct vfsconf *vfsp)
74 {
75 	isohash = 16;
76 	while (isohash < desiredvnodes)
77 		isohash <<= 1;
78 	isohashtbl = malloc(sizeof(void *) * isohash,
79 			    M_ISOFSMNT, M_WAITOK|M_ZERO);
80 	--isohash;
81 	lwkt_token_init(&cd9660_ihash_token);
82 	return (0);
83 }
84 
85 int
86 cd9660_uninit(struct vfsconf *vfsp)
87 {
88 
89 	if (isohashtbl != NULL)
90 		free(isohashtbl, M_ISOFSMNT);
91 	return (0);
92 }
93 
94 
95 /*
96  * Use the device/inum pair to find the incore inode, and return a pointer
97  * to it. If it is in core, but locked, wait for it.
98  */
99 struct vnode *
100 cd9660_ihashget(dev_t dev, ino_t inum)
101 {
102 	struct thread *td = curthread;		/* XXX */
103 	struct iso_node *ip;
104 	lwkt_tokref ilock;
105 	lwkt_tokref vlock;
106 	struct vnode *vp;
107 
108 	lwkt_gettoken(&ilock, &cd9660_ihash_token);
109 loop:
110 	for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
111 		if (inum != ip->i_number || dev != ip->i_dev)
112 			continue;
113 		vp = ITOV(ip);
114 		lwkt_gettoken(&vlock, vp->v_interlock);
115 		/*
116 		 * We must check to see if the inode has been ripped
117 		 * out from under us after blocking.
118 		 */
119 		for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
120 			if (inum == ip->i_number && dev == ip->i_dev)
121 				break;
122 		}
123 		if (ip == NULL || ITOV(ip) != vp) {
124 			lwkt_reltoken(&vlock);
125 			goto loop;
126 		}
127 		if (vget(vp, &vlock, LK_EXCLUSIVE | LK_INTERLOCK, td))
128 			goto loop;
129 		lwkt_reltoken(&ilock);
130 		return (vp);
131 	}
132 	lwkt_reltoken(&ilock);
133 	return (NULL);
134 }
135 
136 /*
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.
139  */
140 int
141 cd9660_ihashins(struct iso_node *ip)
142 {
143 	struct iso_node **ipp, *iq;
144 	lwkt_tokref ilock;
145 
146 	lwkt_gettoken(&ilock, &cd9660_ihash_token);
147 	ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
148 	while ((iq = *ipp) != NULL) {
149 		if (iq->i_dev == ip->i_dev && iq->i_number == ip->i_number) {
150 			lwkt_reltoken(&ilock);
151 			return(EBUSY);
152 		}
153 		ipp = &iq->i_next;
154 	}
155 	ip->i_next = NULL;
156 	*ipp = ip;
157 	lwkt_reltoken(&ilock);
158 	return(0);
159 }
160 
161 /*
162  * Remove the inode from the hash table.
163  */
164 static void
165 cd9660_ihashrem(struct iso_node *ip)
166 {
167 	struct iso_node **ipp, *iq;
168 	lwkt_tokref ilock;
169 
170 	lwkt_gettoken(&ilock, &cd9660_ihash_token);
171 	ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
172 	while ((iq = *ipp) != NULL) {
173 		if (ip == iq)
174 			break;
175 		ipp = &iq->i_next;
176 	}
177 	KKASSERT(ip == iq);
178 	*ipp = ip->i_next;
179 	ip->i_next = NULL;
180 	lwkt_reltoken(&ilock);
181 }
182 
183 /*
184  * Last reference to an inode, write the inode out and if necessary,
185  * truncate and deallocate the file.
186  *
187  * cd9660_inactive(struct vnode *a_vp, struct thread *a_td)
188  */
189 int
190 cd9660_inactive(struct vop_inactive_args *ap)
191 {
192 	struct vnode *vp = ap->a_vp;
193 	struct thread *td = ap->a_td;
194 	struct iso_node *ip = VTOI(vp);
195 	int error = 0;
196 
197 	if (prtactive && vp->v_usecount != 0)
198 		vprint("cd9660_inactive: pushing active", vp);
199 
200 	if (ip)
201 		ip->i_flag = 0;
202 	VOP_UNLOCK(vp, NULL, 0, td);
203 	/*
204 	 * If we are done with the inode, reclaim it
205 	 * so that it can be reused immediately.
206 	 */
207 	if (ip == NULL || ip->inode.iso_mode == 0)
208 		vrecycle(vp, NULL, td);
209 	return error;
210 }
211 
212 /*
213  * Reclaim an inode so that it can be used for other purposes.
214  *
215  * cd9660_reclaim(struct vnode *a_vp, struct proc *a_p)
216  */
217 int
218 cd9660_reclaim(struct vop_reclaim_args *ap)
219 {
220 	struct vnode *vp = ap->a_vp;
221 	struct iso_node *ip = VTOI(vp);
222 
223 	if (prtactive && vp->v_usecount != 0)
224 		vprint("cd9660_reclaim: pushing active", vp);
225 	/*
226 	 * Remove the inode from its hash chain and purge namecache
227 	 * data associated with the vnode.
228 	 */
229 	cache_purge(vp);
230 	vp->v_data = NULL;
231 	if (ip) {
232 		cd9660_ihashrem(ip);
233 		if (ip->i_devvp) {
234 			vrele(ip->i_devvp);
235 			ip->i_devvp = 0;
236 		}
237 		free(ip, M_ISOFSNODE);
238 	}
239 	return (0);
240 }
241 
242 /*
243  * File attributes
244  */
245 void
246 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop,
247 	       struct buf *bp, enum ISO_FTYPE ftype)
248 {
249 	struct buf *bp2 = NULL;
250 	struct iso_mnt *imp;
251 	struct iso_extended_attributes *ap = NULL;
252 	int off;
253 
254 	/* high sierra does not have timezone data, flag is one byte ahead */
255 	if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
256 		       &isodir->date[6]: isodir->flags)&2) {
257 		inop->inode.iso_mode = S_IFDIR;
258 		/*
259 		 * If we return 2, fts() will assume there are no subdirectories
260 		 * (just links for the path and .), so instead we return 1.
261 		 */
262 		inop->inode.iso_links = 1;
263 	} else {
264 		inop->inode.iso_mode = S_IFREG;
265 		inop->inode.iso_links = 1;
266 	}
267 	if (!bp
268 	    && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
269 	    && (off = isonum_711(isodir->ext_attr_length))) {
270 		cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
271 			     &bp2);
272 		bp = bp2;
273 	}
274 	if (bp) {
275 		ap = (struct iso_extended_attributes *)bp->b_data;
276 
277 		if (isonum_711(ap->version) == 1) {
278 			if (!(ap->perm[0]&0x40))
279 				inop->inode.iso_mode |= VEXEC >> 6;
280 			if (!(ap->perm[0]&0x10))
281 				inop->inode.iso_mode |= VREAD >> 6;
282 			if (!(ap->perm[0]&4))
283 				inop->inode.iso_mode |= VEXEC >> 3;
284 			if (!(ap->perm[0]&1))
285 				inop->inode.iso_mode |= VREAD >> 3;
286 			if (!(ap->perm[1]&0x40))
287 				inop->inode.iso_mode |= VEXEC;
288 			if (!(ap->perm[1]&0x10))
289 				inop->inode.iso_mode |= VREAD;
290 			inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
291 			inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
292 		} else
293 			ap = NULL;
294 	}
295 	if (!ap) {
296 		inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6;
297 		inop->inode.iso_uid = (uid_t)0;
298 		inop->inode.iso_gid = (gid_t)0;
299 	}
300 	if (bp2)
301 		brelse(bp2);
302 }
303 
304 /*
305  * Time stamps
306  */
307 void
308 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop,
309 		 struct buf *bp, enum ISO_FTYPE ftype)
310 {
311 	struct buf *bp2 = NULL;
312 	struct iso_mnt *imp;
313 	struct iso_extended_attributes *ap = NULL;
314 	int off;
315 
316 	if (!bp
317 	    && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
318 	    && (off = isonum_711(isodir->ext_attr_length))) {
319 		cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
320 			     &bp2);
321 		bp = bp2;
322 	}
323 	if (bp) {
324 		ap = (struct iso_extended_attributes *)bp->b_data;
325 
326 		if (ftype != ISO_FTYPE_HIGH_SIERRA
327 		    && isonum_711(ap->version) == 1) {
328 			if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
329 				cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
330 			if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
331 				inop->inode.iso_ctime = inop->inode.iso_atime;
332 			if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
333 				inop->inode.iso_mtime = inop->inode.iso_ctime;
334 		} else
335 			ap = NULL;
336 	}
337 	if (!ap) {
338 		cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
339 		inop->inode.iso_atime = inop->inode.iso_ctime;
340 		inop->inode.iso_mtime = inop->inode.iso_ctime;
341 	}
342 	if (bp2)
343 		brelse(bp2);
344 }
345 
346 int
347 cd9660_tstamp_conv7(u_char *pi, struct timespec *pu, enum ISO_FTYPE ftype)
348 {
349 	int crtime, days;
350 	int y, m, d, hour, minute, second, tz;
351 
352 	y = pi[0] + 1900;
353 	m = pi[1];
354 	d = pi[2];
355 	hour = pi[3];
356 	minute = pi[4];
357 	second = pi[5];
358 	if(ftype != ISO_FTYPE_HIGH_SIERRA)
359 		tz = pi[6];
360 	else
361 		/* original high sierra misses timezone data */
362 		tz = 0;
363 
364 	if (y < 1970) {
365 		pu->tv_sec  = 0;
366 		pu->tv_nsec = 0;
367 		return 0;
368 	} else {
369 #ifdef	ORIGINAL
370 		/* computes day number relative to Sept. 19th,1989 */
371 		/* don't even *THINK* about changing formula. It works! */
372 		days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
373 #else
374 		/*
375 		 * Changed :-) to make it relative to Jan. 1st, 1970
376 		 * and to disambiguate negative division
377 		 */
378 		days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
379 #endif
380 		crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
381 
382 		/* timezone offset is unreliable on some disks */
383 		if (-48 <= tz && tz <= 52)
384 			crtime -= tz * 15 * 60;
385 	}
386 	pu->tv_sec  = crtime;
387 	pu->tv_nsec = 0;
388 	return 1;
389 }
390 
391 static u_int
392 cd9660_chars2ui(u_char *begin, int len)
393 {
394 	u_int rc;
395 
396 	for (rc = 0; --len >= 0;) {
397 		rc *= 10;
398 		rc += *begin++ - '0';
399 	}
400 	return rc;
401 }
402 
403 int
404 cd9660_tstamp_conv17(u_char *pi, struct timespec *pu)
405 {
406 	u_char buf[7];
407 
408 	/* year:"0001"-"9999" -> -1900  */
409 	buf[0] = cd9660_chars2ui(pi,4) - 1900;
410 
411 	/* month: " 1"-"12"   -> 1 - 12 */
412 	buf[1] = cd9660_chars2ui(pi + 4,2);
413 
414 	/* day:	  " 1"-"31"   -> 1 - 31 */
415 	buf[2] = cd9660_chars2ui(pi + 6,2);
416 
417 	/* hour:  " 0"-"23"   -> 0 - 23 */
418 	buf[3] = cd9660_chars2ui(pi + 8,2);
419 
420 	/* minute:" 0"-"59"   -> 0 - 59 */
421 	buf[4] = cd9660_chars2ui(pi + 10,2);
422 
423 	/* second:" 0"-"59"   -> 0 - 59 */
424 	buf[5] = cd9660_chars2ui(pi + 12,2);
425 
426 	/* difference of GMT */
427 	buf[6] = pi[16];
428 
429 	return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
430 }
431 
432 ino_t
433 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp)
434 {
435 	ino_t ino;
436 
437 	ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length))
438 	      << imp->im_bshift;
439 	return (ino);
440 }
441