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(struct vop_inactive_args *ap) 64 { 65 struct vnode *vp = ap->a_vp; 66 struct iso_node *ip = VTOI(vp); 67 int error = 0; 68 69 /* 70 * If we are done with the inode, reclaim it 71 * so that it can be reused immediately. 72 */ 73 if (ip->inode.iso_mode == 0) 74 vrecycle(vp); 75 return error; 76 } 77 78 /* 79 * Reclaim an inode so that it can be used for other purposes. 80 */ 81 int 82 cd9660_reclaim(struct vop_reclaim_args *ap) 83 { 84 struct vnode *vp = ap->a_vp; 85 86 /* 87 * Remove the inode from its hash chain. 88 */ 89 vfs_hash_remove(vp); 90 91 /* 92 * Purge old data structures associated with the inode. 93 */ 94 free(vp->v_data, M_ISOFSNODE); 95 vp->v_data = NULL; 96 return (0); 97 } 98 99 /* 100 * File attributes 101 */ 102 void 103 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop, 104 struct buf *bp, enum ISO_FTYPE ftype) 105 { 106 struct buf *bp2 = NULL; 107 struct iso_mnt *imp; 108 struct iso_extended_attributes *ap = NULL; 109 int off; 110 111 /* high sierra does not have timezone data, flag is one byte ahead */ 112 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA? 113 &isodir->date[6]: isodir->flags)&2) { 114 inop->inode.iso_mode = S_IFDIR; 115 /* 116 * If we return 2, fts() will assume there are no subdirectories 117 * (just links for the path and .), so instead we return 1. 118 */ 119 inop->inode.iso_links = 1; 120 } else { 121 inop->inode.iso_mode = S_IFREG; 122 inop->inode.iso_links = 1; 123 } 124 if (!bp 125 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 126 && (off = isonum_711(isodir->ext_attr_length))) { 127 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 128 &bp2); 129 bp = bp2; 130 } 131 if (bp) { 132 ap = (struct iso_extended_attributes *)bp->b_data; 133 134 if (isonum_711(ap->version) == 1) { 135 if (!(ap->perm[0]&0x40)) 136 inop->inode.iso_mode |= S_IXOTH; 137 if (!(ap->perm[0]&0x10)) 138 inop->inode.iso_mode |= S_IROTH; 139 if (!(ap->perm[0]&4)) 140 inop->inode.iso_mode |= S_IXGRP; 141 if (!(ap->perm[0]&1)) 142 inop->inode.iso_mode |= S_IRGRP; 143 if (!(ap->perm[1]&0x40)) 144 inop->inode.iso_mode |= S_IXUSR; 145 if (!(ap->perm[1]&0x10)) 146 inop->inode.iso_mode |= S_IRUSR; 147 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 148 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 149 } else 150 ap = NULL; 151 } 152 if (!ap) { 153 inop->inode.iso_mode |= S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 154 inop->inode.iso_uid = (uid_t)0; 155 inop->inode.iso_gid = (gid_t)0; 156 } 157 if (bp2) 158 brelse(bp2); 159 } 160 161 /* 162 * Time stamps 163 */ 164 void 165 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop, 166 struct buf *bp, enum ISO_FTYPE ftype) 167 { 168 struct buf *bp2 = NULL; 169 struct iso_mnt *imp; 170 struct iso_extended_attributes *ap = NULL; 171 int off; 172 173 if (!bp 174 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 175 && (off = isonum_711(isodir->ext_attr_length))) { 176 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 177 &bp2); 178 bp = bp2; 179 } 180 if (bp) { 181 ap = (struct iso_extended_attributes *)bp->b_data; 182 183 if (ftype != ISO_FTYPE_HIGH_SIERRA 184 && isonum_711(ap->version) == 1) { 185 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 186 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 187 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 188 inop->inode.iso_ctime = inop->inode.iso_atime; 189 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 190 inop->inode.iso_mtime = inop->inode.iso_ctime; 191 } else 192 ap = NULL; 193 } 194 if (!ap) { 195 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype); 196 inop->inode.iso_atime = inop->inode.iso_ctime; 197 inop->inode.iso_mtime = inop->inode.iso_ctime; 198 } 199 if (bp2) 200 brelse(bp2); 201 } 202 203 int 204 cd9660_tstamp_conv7(u_char *pi, struct timespec *pu, enum ISO_FTYPE ftype) 205 { 206 int crtime, days; 207 int y, m, d, hour, minute, second, tz; 208 209 y = pi[0] + 1900; 210 m = pi[1]; 211 d = pi[2]; 212 hour = pi[3]; 213 minute = pi[4]; 214 second = pi[5]; 215 if(ftype != ISO_FTYPE_HIGH_SIERRA) 216 tz = ((signed char *)pi)[6]; /* Timezone value is signed. */ 217 else 218 /* original high sierra misses timezone data */ 219 tz = 0; 220 221 if (y < 1970) { 222 pu->tv_sec = 0; 223 pu->tv_nsec = 0; 224 return 0; 225 } else { 226 #ifdef ORIGINAL 227 /* computes day number relative to Sept. 19th,1989 */ 228 /* don't even *THINK* about changing formula. It works! */ 229 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 230 #else 231 /* 232 * Changed :-) to make it relative to Jan. 1st, 1970 233 * and to disambiguate negative division 234 */ 235 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 236 #endif 237 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 238 239 /* timezone offset is unreliable on some disks */ 240 if (-48 <= tz && tz <= 52) 241 crtime -= tz * 15 * 60; 242 } 243 pu->tv_sec = crtime; 244 pu->tv_nsec = 0; 245 return 1; 246 } 247 248 static u_int 249 cd9660_chars2ui(u_char *begin, int len) 250 { 251 u_int rc; 252 253 for (rc = 0; --len >= 0;) { 254 rc *= 10; 255 rc += *begin++ - '0'; 256 } 257 return rc; 258 } 259 260 int 261 cd9660_tstamp_conv17(u_char *pi, struct timespec *pu) 262 { 263 u_char buf[7]; 264 265 /* year:"0001"-"9999" -> -1900 */ 266 buf[0] = cd9660_chars2ui(pi,4) - 1900; 267 268 /* month: " 1"-"12" -> 1 - 12 */ 269 buf[1] = cd9660_chars2ui(pi + 4,2); 270 271 /* day: " 1"-"31" -> 1 - 31 */ 272 buf[2] = cd9660_chars2ui(pi + 6,2); 273 274 /* hour: " 0"-"23" -> 0 - 23 */ 275 buf[3] = cd9660_chars2ui(pi + 8,2); 276 277 /* minute:" 0"-"59" -> 0 - 59 */ 278 buf[4] = cd9660_chars2ui(pi + 10,2); 279 280 /* second:" 0"-"59" -> 0 - 59 */ 281 buf[5] = cd9660_chars2ui(pi + 12,2); 282 283 /* difference of GMT */ 284 buf[6] = pi[16]; 285 286 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT); 287 } 288 289 cd_ino_t 290 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp) 291 { 292 cd_ino_t ino; 293 294 /* 295 * Note there is an inverse calculation in 296 * cd9660_vfsops.c:cd9660_vget_internal(): 297 * ip->iso_start = ino >> imp->im_bshift; 298 * and also a calculation of the isodir pointer 299 * from an inode in cd9660_vnops.c:cd9660_readlink() 300 */ 301 ino = ((cd_ino_t)isonum_733(isodir->extent) + 302 isonum_711(isodir->ext_attr_length)) << imp->im_bshift; 303 return ino; 304 } 305