xref: /freebsd/sys/fs/cd9660/cd9660_node.c (revision cddbc3b40812213ff00041f79174cac0be360a2a)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1982, 1986, 1989, 1994, 1995
5  *	The Regents of the University of California.  All rights reserved.
6  *
7  * This code is derived from software contributed to Berkeley
8  * by Pace Willisson (pace@blitz.com).  The Rock Ridge Extension
9  * Support code is derived from software contributed to Berkeley
10  * by Atsushi Murai (amurai@spec.co.jp).
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions and the following disclaimer.
17  * 2. Redistributions in binary form must reproduce the above copyright
18  *    notice, this list of conditions and the following disclaimer in the
19  *    documentation and/or other materials provided with the distribution.
20  * 3. Neither the name of the University nor the names of its contributors
21  *    may be used to endorse or promote products derived from this software
22  *    without specific prior written permission.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34  * SUCH DAMAGE.
35  *
36  *	@(#)cd9660_node.c	8.2 (Berkeley) 1/23/94
37  */
38 
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
41 
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/mount.h>
45 #include <sys/bio.h>
46 #include <sys/buf.h>
47 #include <sys/vnode.h>
48 #include <sys/malloc.h>
49 #include <sys/stat.h>
50 #include <sys/mutex.h>
51 
52 #include <fs/cd9660/iso.h>
53 #include <fs/cd9660/cd9660_node.h>
54 #include <fs/cd9660/cd9660_mount.h>
55 
56 static unsigned	cd9660_chars2ui(unsigned char *begin, int len);
57 
58 /*
59  * Last reference to an inode, write the inode out and if necessary,
60  * truncate and deallocate the file.
61  */
62 int
63 cd9660_inactive(ap)
64 	struct vop_inactive_args /* {
65 		struct vnode *a_vp;
66 		struct thread *a_td;
67 	} */ *ap;
68 {
69 	struct vnode *vp = ap->a_vp;
70 	struct iso_node *ip = VTOI(vp);
71 	int error = 0;
72 
73 	/*
74 	 * If we are done with the inode, reclaim it
75 	 * so that it can be reused immediately.
76 	 */
77 	if (ip->inode.iso_mode == 0)
78 		vrecycle(vp);
79 	return error;
80 }
81 
82 /*
83  * Reclaim an inode so that it can be used for other purposes.
84  */
85 int
86 cd9660_reclaim(ap)
87 	struct vop_reclaim_args /* {
88 		struct vnode *a_vp;
89 		struct thread *a_td;
90 	} */ *ap;
91 {
92 	struct vnode *vp = ap->a_vp;
93 
94 	/*
95 	 * Destroy the vm object and flush associated pages.
96 	 */
97 	vnode_destroy_vobject(vp);
98 	/*
99 	 * Remove the inode from its hash chain.
100 	 */
101 	vfs_hash_remove(vp);
102 
103 	/*
104 	 * Purge old data structures associated with the inode.
105 	 */
106 	free(vp->v_data, M_ISOFSNODE);
107 	vp->v_data = NULL;
108 	return (0);
109 }
110 
111 /*
112  * File attributes
113  */
114 void
115 cd9660_defattr(isodir, inop, bp, ftype)
116 	struct iso_directory_record *isodir;
117 	struct iso_node *inop;
118 	struct buf *bp;
119 	enum ISO_FTYPE ftype;
120 {
121 	struct buf *bp2 = NULL;
122 	struct iso_mnt *imp;
123 	struct iso_extended_attributes *ap = NULL;
124 	int off;
125 
126 	/* high sierra does not have timezone data, flag is one byte ahead */
127 	if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
128 		       &isodir->date[6]: isodir->flags)&2) {
129 		inop->inode.iso_mode = S_IFDIR;
130 		/*
131 		 * If we return 2, fts() will assume there are no subdirectories
132 		 * (just links for the path and .), so instead we return 1.
133 		 */
134 		inop->inode.iso_links = 1;
135 	} else {
136 		inop->inode.iso_mode = S_IFREG;
137 		inop->inode.iso_links = 1;
138 	}
139 	if (!bp
140 	    && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
141 	    && (off = isonum_711(isodir->ext_attr_length))) {
142 		cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
143 			     &bp2);
144 		bp = bp2;
145 	}
146 	if (bp) {
147 		ap = (struct iso_extended_attributes *)bp->b_data;
148 
149 		if (isonum_711(ap->version) == 1) {
150 			if (!(ap->perm[0]&0x40))
151 				inop->inode.iso_mode |= S_IXOTH;
152 			if (!(ap->perm[0]&0x10))
153 				inop->inode.iso_mode |= S_IROTH;
154 			if (!(ap->perm[0]&4))
155 				inop->inode.iso_mode |= S_IXGRP;
156 			if (!(ap->perm[0]&1))
157 				inop->inode.iso_mode |= S_IRGRP;
158 			if (!(ap->perm[1]&0x40))
159 				inop->inode.iso_mode |= S_IXUSR;
160 			if (!(ap->perm[1]&0x10))
161 				inop->inode.iso_mode |= S_IRUSR;
162 			inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
163 			inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
164 		} else
165 			ap = NULL;
166 	}
167 	if (!ap) {
168 		inop->inode.iso_mode |= S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
169 		inop->inode.iso_uid = (uid_t)0;
170 		inop->inode.iso_gid = (gid_t)0;
171 	}
172 	if (bp2)
173 		brelse(bp2);
174 }
175 
176 /*
177  * Time stamps
178  */
179 void
180 cd9660_deftstamp(isodir,inop,bp,ftype)
181 	struct iso_directory_record *isodir;
182 	struct iso_node *inop;
183 	struct buf *bp;
184 	enum ISO_FTYPE ftype;
185 {
186 	struct buf *bp2 = NULL;
187 	struct iso_mnt *imp;
188 	struct iso_extended_attributes *ap = NULL;
189 	int off;
190 
191 	if (!bp
192 	    && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
193 	    && (off = isonum_711(isodir->ext_attr_length))) {
194 		cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
195 			     &bp2);
196 		bp = bp2;
197 	}
198 	if (bp) {
199 		ap = (struct iso_extended_attributes *)bp->b_data;
200 
201 		if (ftype != ISO_FTYPE_HIGH_SIERRA
202 		    && isonum_711(ap->version) == 1) {
203 			if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
204 				cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
205 			if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
206 				inop->inode.iso_ctime = inop->inode.iso_atime;
207 			if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
208 				inop->inode.iso_mtime = inop->inode.iso_ctime;
209 		} else
210 			ap = NULL;
211 	}
212 	if (!ap) {
213 		cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
214 		inop->inode.iso_atime = inop->inode.iso_ctime;
215 		inop->inode.iso_mtime = inop->inode.iso_ctime;
216 	}
217 	if (bp2)
218 		brelse(bp2);
219 }
220 
221 int
222 cd9660_tstamp_conv7(pi,pu,ftype)
223 	u_char *pi;
224 	struct timespec *pu;
225 	enum ISO_FTYPE ftype;
226 {
227 	int crtime, days;
228 	int y, m, d, hour, minute, second, tz;
229 
230 	y = pi[0] + 1900;
231 	m = pi[1];
232 	d = pi[2];
233 	hour = pi[3];
234 	minute = pi[4];
235 	second = pi[5];
236 	if(ftype != ISO_FTYPE_HIGH_SIERRA)
237 		tz = ((signed char *)pi)[6]; /* Timezone value is signed. */
238 	else
239 		/* original high sierra misses timezone data */
240 		tz = 0;
241 
242 	if (y < 1970) {
243 		pu->tv_sec  = 0;
244 		pu->tv_nsec = 0;
245 		return 0;
246 	} else {
247 #ifdef	ORIGINAL
248 		/* computes day number relative to Sept. 19th,1989 */
249 		/* don't even *THINK* about changing formula. It works! */
250 		days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
251 #else
252 		/*
253 		 * Changed :-) to make it relative to Jan. 1st, 1970
254 		 * and to disambiguate negative division
255 		 */
256 		days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
257 #endif
258 		crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
259 
260 		/* timezone offset is unreliable on some disks */
261 		if (-48 <= tz && tz <= 52)
262 			crtime -= tz * 15 * 60;
263 	}
264 	pu->tv_sec  = crtime;
265 	pu->tv_nsec = 0;
266 	return 1;
267 }
268 
269 static u_int
270 cd9660_chars2ui(begin,len)
271 	u_char *begin;
272 	int len;
273 {
274 	u_int rc;
275 
276 	for (rc = 0; --len >= 0;) {
277 		rc *= 10;
278 		rc += *begin++ - '0';
279 	}
280 	return rc;
281 }
282 
283 int
284 cd9660_tstamp_conv17(pi,pu)
285 	u_char *pi;
286 	struct timespec *pu;
287 {
288 	u_char buf[7];
289 
290 	/* year:"0001"-"9999" -> -1900  */
291 	buf[0] = cd9660_chars2ui(pi,4) - 1900;
292 
293 	/* month: " 1"-"12"   -> 1 - 12 */
294 	buf[1] = cd9660_chars2ui(pi + 4,2);
295 
296 	/* day:	  " 1"-"31"   -> 1 - 31 */
297 	buf[2] = cd9660_chars2ui(pi + 6,2);
298 
299 	/* hour:  " 0"-"23"   -> 0 - 23 */
300 	buf[3] = cd9660_chars2ui(pi + 8,2);
301 
302 	/* minute:" 0"-"59"   -> 0 - 59 */
303 	buf[4] = cd9660_chars2ui(pi + 10,2);
304 
305 	/* second:" 0"-"59"   -> 0 - 59 */
306 	buf[5] = cd9660_chars2ui(pi + 12,2);
307 
308 	/* difference of GMT */
309 	buf[6] = pi[16];
310 
311 	return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
312 }
313 
314 cd_ino_t
315 isodirino(isodir, imp)
316 	struct iso_directory_record *isodir;
317 	struct iso_mnt *imp;
318 {
319 	cd_ino_t ino;
320 
321 	/*
322 	 * Note there is an inverse calculation in
323 	 * cd9660_vfsops.c:cd9660_vget_internal():
324 	 *   ip->iso_start = ino >> imp->im_bshift;
325 	 * and also a calculation of the isodir pointer
326 	 * from an inode in cd9660_vnops.c:cd9660_readlink()
327 	 */
328 	ino = ((cd_ino_t)isonum_733(isodir->extent) +
329 		isonum_711(isodir->ext_attr_length)) << imp->im_bshift;
330 	return ino;
331 }
332