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 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/mount.h> 43 #include <sys/bio.h> 44 #include <sys/buf.h> 45 #include <sys/vnode.h> 46 #include <sys/malloc.h> 47 #include <sys/stat.h> 48 #include <sys/mutex.h> 49 50 #include <fs/cd9660/iso.h> 51 #include <fs/cd9660/cd9660_node.h> 52 #include <fs/cd9660/cd9660_mount.h> 53 54 static unsigned cd9660_chars2ui(unsigned char *begin, int len); 55 56 /* 57 * Last reference to an inode, write the inode out and if necessary, 58 * truncate and deallocate the file. 59 */ 60 int 61 cd9660_inactive(struct vop_inactive_args *ap) 62 { 63 struct vnode *vp = ap->a_vp; 64 struct iso_node *ip = VTOI(vp); 65 int error = 0; 66 67 /* 68 * If we are done with the inode, reclaim it 69 * so that it can be reused immediately. 70 */ 71 if (ip->inode.iso_mode == 0) 72 vrecycle(vp); 73 return error; 74 } 75 76 /* 77 * Reclaim an inode so that it can be used for other purposes. 78 */ 79 int 80 cd9660_reclaim(struct vop_reclaim_args *ap) 81 { 82 struct vnode *vp = ap->a_vp; 83 84 /* 85 * Remove the inode from its hash chain. 86 */ 87 vfs_hash_remove(vp); 88 89 /* 90 * Purge old data structures associated with the inode. 91 */ 92 free(vp->v_data, M_ISOFSNODE); 93 vp->v_data = NULL; 94 return (0); 95 } 96 97 /* 98 * File attributes 99 */ 100 void 101 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop, 102 struct buf *bp, enum ISO_FTYPE ftype) 103 { 104 struct buf *bp2 = NULL; 105 struct iso_mnt *imp; 106 struct iso_extended_attributes *ap = NULL; 107 int off; 108 109 /* high sierra does not have timezone data, flag is one byte ahead */ 110 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA? 111 &isodir->date[6]: isodir->flags)&2) { 112 inop->inode.iso_mode = S_IFDIR; 113 /* 114 * If we return 2, fts() will assume there are no subdirectories 115 * (just links for the path and .), so instead we return 1. 116 */ 117 inop->inode.iso_links = 1; 118 } else { 119 inop->inode.iso_mode = S_IFREG; 120 inop->inode.iso_links = 1; 121 } 122 if (!bp 123 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 124 && (off = isonum_711(isodir->ext_attr_length))) { 125 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 126 &bp2); 127 bp = bp2; 128 } 129 if (bp) { 130 ap = (struct iso_extended_attributes *)bp->b_data; 131 132 if (isonum_711(ap->version) == 1) { 133 if (!(ap->perm[0]&0x40)) 134 inop->inode.iso_mode |= S_IXOTH; 135 if (!(ap->perm[0]&0x10)) 136 inop->inode.iso_mode |= S_IROTH; 137 if (!(ap->perm[0]&4)) 138 inop->inode.iso_mode |= S_IXGRP; 139 if (!(ap->perm[0]&1)) 140 inop->inode.iso_mode |= S_IRGRP; 141 if (!(ap->perm[1]&0x40)) 142 inop->inode.iso_mode |= S_IXUSR; 143 if (!(ap->perm[1]&0x10)) 144 inop->inode.iso_mode |= S_IRUSR; 145 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 146 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 147 } else 148 ap = NULL; 149 } 150 if (!ap) { 151 inop->inode.iso_mode |= S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 152 inop->inode.iso_uid = (uid_t)0; 153 inop->inode.iso_gid = (gid_t)0; 154 } 155 if (bp2) 156 brelse(bp2); 157 } 158 159 /* 160 * Time stamps 161 */ 162 void 163 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop, 164 struct buf *bp, enum ISO_FTYPE ftype) 165 { 166 struct buf *bp2 = NULL; 167 struct iso_mnt *imp; 168 struct iso_extended_attributes *ap = NULL; 169 int off; 170 171 if (!bp 172 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 173 && (off = isonum_711(isodir->ext_attr_length))) { 174 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 175 &bp2); 176 bp = bp2; 177 } 178 if (bp) { 179 ap = (struct iso_extended_attributes *)bp->b_data; 180 181 if (ftype != ISO_FTYPE_HIGH_SIERRA 182 && isonum_711(ap->version) == 1) { 183 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 184 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 185 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 186 inop->inode.iso_ctime = inop->inode.iso_atime; 187 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 188 inop->inode.iso_mtime = inop->inode.iso_ctime; 189 } else 190 ap = NULL; 191 } 192 if (!ap) { 193 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype); 194 inop->inode.iso_atime = inop->inode.iso_ctime; 195 inop->inode.iso_mtime = inop->inode.iso_ctime; 196 } 197 if (bp2) 198 brelse(bp2); 199 } 200 201 int 202 cd9660_tstamp_conv7(u_char *pi, struct timespec *pu, enum ISO_FTYPE ftype) 203 { 204 int crtime, days; 205 int y, m, d, hour, minute, second, tz; 206 207 y = pi[0] + 1900; 208 m = pi[1]; 209 d = pi[2]; 210 hour = pi[3]; 211 minute = pi[4]; 212 second = pi[5]; 213 if(ftype != ISO_FTYPE_HIGH_SIERRA) 214 tz = ((signed char *)pi)[6]; /* Timezone value is signed. */ 215 else 216 /* original high sierra misses timezone data */ 217 tz = 0; 218 219 if (y < 1970) { 220 pu->tv_sec = 0; 221 pu->tv_nsec = 0; 222 return 0; 223 } else { 224 #ifdef ORIGINAL 225 /* computes day number relative to Sept. 19th,1989 */ 226 /* don't even *THINK* about changing formula. It works! */ 227 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 228 #else 229 /* 230 * Changed :-) to make it relative to Jan. 1st, 1970 231 * and to disambiguate negative division 232 */ 233 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 234 #endif 235 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 236 237 /* timezone offset is unreliable on some disks */ 238 if (-48 <= tz && tz <= 52) 239 crtime -= tz * 15 * 60; 240 } 241 pu->tv_sec = crtime; 242 pu->tv_nsec = 0; 243 return 1; 244 } 245 246 static u_int 247 cd9660_chars2ui(u_char *begin, int len) 248 { 249 u_int rc; 250 251 for (rc = 0; --len >= 0;) { 252 rc *= 10; 253 rc += *begin++ - '0'; 254 } 255 return rc; 256 } 257 258 int 259 cd9660_tstamp_conv17(u_char *pi, struct timespec *pu) 260 { 261 u_char buf[7]; 262 263 /* year:"0001"-"9999" -> -1900 */ 264 buf[0] = cd9660_chars2ui(pi,4) - 1900; 265 266 /* month: " 1"-"12" -> 1 - 12 */ 267 buf[1] = cd9660_chars2ui(pi + 4,2); 268 269 /* day: " 1"-"31" -> 1 - 31 */ 270 buf[2] = cd9660_chars2ui(pi + 6,2); 271 272 /* hour: " 0"-"23" -> 0 - 23 */ 273 buf[3] = cd9660_chars2ui(pi + 8,2); 274 275 /* minute:" 0"-"59" -> 0 - 59 */ 276 buf[4] = cd9660_chars2ui(pi + 10,2); 277 278 /* second:" 0"-"59" -> 0 - 59 */ 279 buf[5] = cd9660_chars2ui(pi + 12,2); 280 281 /* difference of GMT */ 282 buf[6] = pi[16]; 283 284 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT); 285 } 286 287 cd_ino_t 288 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp) 289 { 290 cd_ino_t ino; 291 292 /* 293 * Note there is an inverse calculation in 294 * cd9660_vfsops.c:cd9660_vget_internal(): 295 * ip->iso_start = ino >> imp->im_bshift; 296 * and also a calculation of the isodir pointer 297 * from an inode in cd9660_vnops.c:cd9660_readlink() 298 */ 299 ino = ((cd_ino_t)isonum_733(isodir->extent) + 300 isonum_711(isodir->ext_attr_length)) << imp->im_bshift; 301 return ino; 302 } 303