cd9660_node.c revision 1.36
1 /* $NetBSD: cd9660_node.c,v 1.36 2017/04/11 14:24:59 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 1.36 2017/04/11 14:24:59 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 extern int prtactive; /* 1 => print out reclaim of active vnodes */ 61 62 struct pool cd9660_node_pool; 63 64 static u_int cd9660_chars2ui(const u_char *, int); 65 66 /* 67 * Initialize pool for nodes. 68 */ 69 void 70 cd9660_init(void) 71 { 72 73 malloc_type_attach(M_ISOFSMNT); 74 pool_init(&cd9660_node_pool, sizeof(struct iso_node), 0, 0, 0, 75 "cd9660nopl", &pool_allocator_nointr, IPL_NONE); 76 } 77 78 /* 79 * Reinitialize. 80 */ 81 82 void 83 cd9660_reinit(void) 84 { 85 86 } 87 88 /* 89 * Destroy node pool. 90 */ 91 void 92 cd9660_done(void) 93 { 94 pool_destroy(&cd9660_node_pool); 95 malloc_type_detach(M_ISOFSMNT); 96 } 97 98 /* 99 * Last reference to an inode, write the inode out and if necessary, 100 * truncate and deallocate the file. 101 */ 102 int 103 cd9660_inactive(void *v) 104 { 105 struct vop_inactive_v2_args /* { 106 struct vnode *a_vp; 107 bool *a_recycle; 108 } */ *ap = v; 109 struct vnode *vp = ap->a_vp; 110 struct iso_node *ip = VTOI(vp); 111 int error = 0; 112 113 /* 114 * If we are done with the inode, reclaim it 115 * so that it can be reused immediately. 116 */ 117 ip->i_flag = 0; 118 *ap->a_recycle = (ip->inode.iso_mode == 0); 119 return error; 120 } 121 122 /* 123 * Reclaim an inode so that it can be used for other purposes. 124 */ 125 int 126 cd9660_reclaim(void *v) 127 { 128 struct vop_reclaim_args /* { 129 struct vnode *a_vp; 130 struct lwp *a_l; 131 } */ *ap = v; 132 struct vnode *vp = ap->a_vp; 133 134 if (prtactive && vp->v_usecount > 1) 135 vprint("cd9660_reclaim: pushing active", vp); 136 /* 137 * Purge old data structures associated with the inode. 138 */ 139 genfs_node_destroy(vp); 140 pool_put(&cd9660_node_pool, vp->v_data); 141 vp->v_data = NULL; 142 return (0); 143 } 144 145 /* 146 * File attributes 147 */ 148 void 149 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop, 150 struct buf *bp) 151 { 152 struct buf *bp2 = NULL; 153 struct iso_mnt *imp; 154 struct iso_extended_attributes *ap = NULL; 155 int off; 156 157 if (isonum_711(isodir->flags)&2) { 158 inop->inode.iso_mode = S_IFDIR; 159 /* 160 * If we return 2, fts() will assume there are no subdirectories 161 * (just links for the path and .), so instead we return 1. 162 */ 163 inop->inode.iso_links = 1; 164 } else { 165 inop->inode.iso_mode = S_IFREG; 166 inop->inode.iso_links = 1; 167 } 168 if (!bp 169 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 170 && (off = isonum_711(isodir->ext_attr_length))) { 171 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 172 NULL, &bp2); 173 bp = bp2; 174 } 175 if (bp) { 176 ap = (struct iso_extended_attributes *)bp->b_data; 177 178 if (isonum_711(ap->version) == 1) { 179 if (!(ap->perm[1]&0x10)) 180 inop->inode.iso_mode |= S_IRUSR; 181 if (!(ap->perm[1]&0x40)) 182 inop->inode.iso_mode |= S_IXUSR; 183 if (!(ap->perm[0]&0x01)) 184 inop->inode.iso_mode |= S_IRGRP; 185 if (!(ap->perm[0]&0x04)) 186 inop->inode.iso_mode |= S_IXGRP; 187 if (!(ap->perm[0]&0x10)) 188 inop->inode.iso_mode |= S_IROTH; 189 if (!(ap->perm[0]&0x40)) 190 inop->inode.iso_mode |= S_IXOTH; 191 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 192 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 193 } else 194 ap = NULL; 195 } 196 if (!ap) { 197 inop->inode.iso_mode |= 198 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 199 inop->inode.iso_uid = (uid_t)0; 200 inop->inode.iso_gid = (gid_t)0; 201 } 202 if (bp2) 203 brelse(bp2, 0); 204 } 205 206 /* 207 * Time stamps 208 */ 209 void 210 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop, 211 struct buf *bp) 212 { 213 struct buf *bp2 = NULL; 214 struct iso_mnt *imp; 215 struct iso_extended_attributes *ap = NULL; 216 int off; 217 218 if (!bp 219 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 220 && (off = isonum_711(isodir->ext_attr_length))) { 221 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 222 NULL, &bp2); 223 bp = bp2; 224 } 225 if (bp) { 226 ap = (struct iso_extended_attributes *)bp->b_data; 227 228 if (isonum_711(ap->version) == 1) { 229 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 230 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 231 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 232 inop->inode.iso_ctime = inop->inode.iso_atime; 233 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 234 inop->inode.iso_mtime = inop->inode.iso_ctime; 235 } else 236 ap = NULL; 237 } 238 if (!ap) { 239 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime); 240 inop->inode.iso_atime = inop->inode.iso_ctime; 241 inop->inode.iso_mtime = inop->inode.iso_ctime; 242 } 243 if (bp2) 244 brelse(bp2, 0); 245 } 246 247 int 248 cd9660_tstamp_conv7(const u_char *pi, struct timespec *pu) 249 { 250 int crtime, days; 251 int y, m, d, hour, minute, second, tz; 252 253 y = pi[0] + 1900; 254 m = pi[1]; 255 d = pi[2]; 256 hour = pi[3]; 257 minute = pi[4]; 258 second = pi[5]; 259 tz = pi[6]; 260 261 if (y < 1970) { 262 pu->tv_sec = 0; 263 pu->tv_nsec = 0; 264 return 0; 265 } else { 266 #ifdef ORIGINAL 267 /* computes day number relative to Sept. 19th,1989 */ 268 /* don't even *THINK* about changing formula. It works! */ 269 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 270 #else 271 /* 272 * Changed :-) to make it relative to Jan. 1st, 1970 273 * and to disambiguate negative division 274 */ 275 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 276 #endif 277 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 278 279 /* timezone offset is unreliable on some disks */ 280 if (-48 <= tz && tz <= 52) 281 crtime -= tz * 15 * 60; 282 } 283 pu->tv_sec = crtime; 284 pu->tv_nsec = 0; 285 return 1; 286 } 287 288 static u_int 289 cd9660_chars2ui(const u_char *begin, int len) 290 { 291 u_int rc; 292 293 for (rc = 0; --len >= 0;) { 294 rc *= 10; 295 rc += *begin++ - '0'; 296 } 297 return rc; 298 } 299 300 int 301 cd9660_tstamp_conv17(const u_char *pi, struct timespec *pu) 302 { 303 u_char tbuf[7]; 304 305 /* year:"0001"-"9999" -> -1900 */ 306 tbuf[0] = cd9660_chars2ui(pi,4) - 1900; 307 308 /* month: " 1"-"12" -> 1 - 12 */ 309 tbuf[1] = cd9660_chars2ui(pi + 4,2); 310 311 /* day: " 1"-"31" -> 1 - 31 */ 312 tbuf[2] = cd9660_chars2ui(pi + 6,2); 313 314 /* hour: " 0"-"23" -> 0 - 23 */ 315 tbuf[3] = cd9660_chars2ui(pi + 8,2); 316 317 /* minute:" 0"-"59" -> 0 - 59 */ 318 tbuf[4] = cd9660_chars2ui(pi + 10,2); 319 320 /* second:" 0"-"59" -> 0 - 59 */ 321 tbuf[5] = cd9660_chars2ui(pi + 12,2); 322 323 /* difference of GMT */ 324 tbuf[6] = pi[16]; 325 326 return cd9660_tstamp_conv7(tbuf,pu); 327 } 328 329 ino_t 330 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp) 331 { 332 ino_t ino; 333 334 /* 335 * Note there is an inverse calculation in 336 * cd9660_vfsops.c:cd9660_loadvnode(): 337 * ip->iso_start = ino >> imp->im_bshift; 338 * and also a calculation of the isodir pointer 339 * from an inode in cd9660_vnops.c:cd9660_readlink() 340 */ 341 ino = ((ino_t)isonum_733(isodir->extent) + 342 isonum_711(isodir->ext_attr_length)) << imp->im_bshift; 343 return ino; 344 } 345
Indexes created Wed Sep 24 05:09:52 GMT 2025