1 /* $NetBSD: cd9660_node.c,v 1.38 2017/05/26 14:34:19 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 1982, 1986, 1989, 1994 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 (at) blitz.com). The Rock Ridge Extension 9 * Support code is derived from software contributed to Berkeley 10 * by Atsushi Murai (amurai (at) 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 8.8 (Berkeley) 5/22/95 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: cd9660_node.c,v 1.38 2017/05/26 14:34:19 riastradh Exp $"); 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/mount.h> 45 #include <sys/proc.h> 46 #include <sys/file.h> 47 #include <sys/buf.h> 48 #include <sys/vnode.h> 49 #include <sys/namei.h> 50 #include <sys/kernel.h> 51 #include <sys/pool.h> 52 #include <sys/stat.h> 53 54 #include <fs/cd9660/iso.h> 55 #include <fs/cd9660/cd9660_extern.h> 56 #include <fs/cd9660/cd9660_node.h> 57 #include <fs/cd9660/cd9660_mount.h> 58 #include <fs/cd9660/iso_rrip.h> 59 60 struct pool cd9660_node_pool; 61 62 static u_int cd9660_chars2ui(const u_char *, int); 63 64 /* 65 * Initialize pool for nodes. 66 */ 67 void 68 cd9660_init(void) 69 { 70 71 malloc_type_attach(M_ISOFSMNT); 72 pool_init(&cd9660_node_pool, sizeof(struct iso_node), 0, 0, 0, 73 "cd9660nopl", &pool_allocator_nointr, IPL_NONE); 74 } 75 76 /* 77 * Reinitialize. 78 */ 79 80 void 81 cd9660_reinit(void) 82 { 83 84 } 85 86 /* 87 * Destroy node pool. 88 */ 89 void 90 cd9660_done(void) 91 { 92 pool_destroy(&cd9660_node_pool); 93 malloc_type_detach(M_ISOFSMNT); 94 } 95 96 /* 97 * Last reference to an inode, write the inode out and if necessary, 98 * truncate and deallocate the file. 99 */ 100 int 101 cd9660_inactive(void *v) 102 { 103 struct vop_inactive_v2_args /* { 104 struct vnode *a_vp; 105 bool *a_recycle; 106 } */ *ap = v; 107 struct vnode *vp = ap->a_vp; 108 struct iso_node *ip = VTOI(vp); 109 int error = 0; 110 111 /* 112 * If we are done with the inode, reclaim it 113 * so that it can be reused immediately. 114 */ 115 ip->i_flag = 0; 116 *ap->a_recycle = (ip->inode.iso_mode == 0); 117 return error; 118 } 119 120 /* 121 * Reclaim an inode so that it can be used for other purposes. 122 */ 123 int 124 cd9660_reclaim(void *v) 125 { 126 struct vop_reclaim_v2_args /* { 127 struct vnode *a_vp; 128 struct lwp *a_l; 129 } */ *ap = v; 130 struct vnode *vp = ap->a_vp; 131 132 VOP_UNLOCK(vp); 133 134 /* 135 * Purge old data structures associated with the inode. 136 */ 137 genfs_node_destroy(vp); 138 pool_put(&cd9660_node_pool, vp->v_data); 139 vp->v_data = NULL; 140 return (0); 141 } 142 143 /* 144 * File attributes 145 */ 146 void 147 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop, 148 struct buf *bp) 149 { 150 struct buf *bp2 = NULL; 151 struct iso_mnt *imp; 152 struct iso_extended_attributes *ap = NULL; 153 int off; 154 155 if (isonum_711(isodir->flags)&2) { 156 inop->inode.iso_mode = S_IFDIR; 157 /* 158 * If we return 2, fts() will assume there are no subdirectories 159 * (just links for the path and .), so instead we return 1. 160 */ 161 inop->inode.iso_links = 1; 162 } else { 163 inop->inode.iso_mode = S_IFREG; 164 inop->inode.iso_links = 1; 165 } 166 if (!bp 167 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 168 && (off = isonum_711(isodir->ext_attr_length))) { 169 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 170 NULL, &bp2); 171 bp = bp2; 172 } 173 if (bp) { 174 ap = (struct iso_extended_attributes *)bp->b_data; 175 176 if (isonum_711(ap->version) == 1) { 177 if (!(ap->perm[1]&0x10)) 178 inop->inode.iso_mode |= S_IRUSR; 179 if (!(ap->perm[1]&0x40)) 180 inop->inode.iso_mode |= S_IXUSR; 181 if (!(ap->perm[0]&0x01)) 182 inop->inode.iso_mode |= S_IRGRP; 183 if (!(ap->perm[0]&0x04)) 184 inop->inode.iso_mode |= S_IXGRP; 185 if (!(ap->perm[0]&0x10)) 186 inop->inode.iso_mode |= S_IROTH; 187 if (!(ap->perm[0]&0x40)) 188 inop->inode.iso_mode |= S_IXOTH; 189 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 190 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 191 } else 192 ap = NULL; 193 } 194 if (!ap) { 195 inop->inode.iso_mode |= 196 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 197 inop->inode.iso_uid = (uid_t)0; 198 inop->inode.iso_gid = (gid_t)0; 199 } 200 if (bp2) 201 brelse(bp2, 0); 202 } 203 204 /* 205 * Time stamps 206 */ 207 void 208 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop, 209 struct buf *bp) 210 { 211 struct buf *bp2 = NULL; 212 struct iso_mnt *imp; 213 struct iso_extended_attributes *ap = NULL; 214 int off; 215 216 if (!bp 217 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 218 && (off = isonum_711(isodir->ext_attr_length))) { 219 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 220 NULL, &bp2); 221 bp = bp2; 222 } 223 if (bp) { 224 ap = (struct iso_extended_attributes *)bp->b_data; 225 226 if (isonum_711(ap->version) == 1) { 227 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 228 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 229 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 230 inop->inode.iso_ctime = inop->inode.iso_atime; 231 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 232 inop->inode.iso_mtime = inop->inode.iso_ctime; 233 } else 234 ap = NULL; 235 } 236 if (!ap) { 237 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime); 238 inop->inode.iso_atime = inop->inode.iso_ctime; 239 inop->inode.iso_mtime = inop->inode.iso_ctime; 240 } 241 if (bp2) 242 brelse(bp2, 0); 243 } 244 245 int 246 cd9660_tstamp_conv7(const u_char *pi, struct timespec *pu) 247 { 248 int crtime, days; 249 int y, m, d, hour, minute, second, tz; 250 251 y = pi[0] + 1900; 252 m = pi[1]; 253 d = pi[2]; 254 hour = pi[3]; 255 minute = pi[4]; 256 second = pi[5]; 257 tz = pi[6]; 258 259 if (y < 1970) { 260 pu->tv_sec = 0; 261 pu->tv_nsec = 0; 262 return 0; 263 } else { 264 #ifdef ORIGINAL 265 /* computes day number relative to Sept. 19th,1989 */ 266 /* don't even *THINK* about changing formula. It works! */ 267 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 268 #else 269 /* 270 * Changed :-) to make it relative to Jan. 1st, 1970 271 * and to disambiguate negative division 272 */ 273 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 274 #endif 275 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 276 277 /* timezone offset is unreliable on some disks */ 278 if (-48 <= tz && tz <= 52) 279 crtime -= tz * 15 * 60; 280 } 281 pu->tv_sec = crtime; 282 pu->tv_nsec = 0; 283 return 1; 284 } 285 286 static u_int 287 cd9660_chars2ui(const u_char *begin, int len) 288 { 289 u_int rc; 290 291 for (rc = 0; --len >= 0;) { 292 rc *= 10; 293 rc += *begin++ - '0'; 294 } 295 return rc; 296 } 297 298 int 299 cd9660_tstamp_conv17(const u_char *pi, struct timespec *pu) 300 { 301 u_char tbuf[7]; 302 303 /* year:"0001"-"9999" -> -1900 */ 304 tbuf[0] = cd9660_chars2ui(pi,4) - 1900; 305 306 /* month: " 1"-"12" -> 1 - 12 */ 307 tbuf[1] = cd9660_chars2ui(pi + 4,2); 308 309 /* day: " 1"-"31" -> 1 - 31 */ 310 tbuf[2] = cd9660_chars2ui(pi + 6,2); 311 312 /* hour: " 0"-"23" -> 0 - 23 */ 313 tbuf[3] = cd9660_chars2ui(pi + 8,2); 314 315 /* minute:" 0"-"59" -> 0 - 59 */ 316 tbuf[4] = cd9660_chars2ui(pi + 10,2); 317 318 /* second:" 0"-"59" -> 0 - 59 */ 319 tbuf[5] = cd9660_chars2ui(pi + 12,2); 320 321 /* difference of GMT */ 322 tbuf[6] = pi[16]; 323 324 return cd9660_tstamp_conv7(tbuf,pu); 325 } 326 327 ino_t 328 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp) 329 { 330 ino_t ino; 331 332 /* 333 * Note there is an inverse calculation in 334 * cd9660_vfsops.c:cd9660_loadvnode(): 335 * ip->iso_start = ino >> imp->im_bshift; 336 * and also a calculation of the isodir pointer 337 * from an inode in cd9660_vnops.c:cd9660_readlink() 338 */ 339 ino = ((ino_t)isonum_733(isodir->extent) + 340 isonum_711(isodir->ext_attr_length)) << imp->im_bshift; 341 return ino; 342 } 343
Indexes created Sun Sep 21 20:09:37 GMT 2025