cd9660_node.c revision 331722
1/*- 2 * Copyright (c) 1982, 1986, 1989, 1994, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley 6 * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension 7 * Support code is derived from software contributed to Berkeley 8 * by Atsushi Murai (amurai@spec.co.jp). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)cd9660_node.c 8.2 (Berkeley) 1/23/94 35 */ 36 37#include <sys/cdefs.h> 38__FBSDID("$FreeBSD: stable/11/sys/fs/cd9660/cd9660_node.c 331722 2018-03-29 02:50:57Z eadler $"); 39 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 54static 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 */ 60int 61cd9660_inactive(ap) 62 struct vop_inactive_args /* { 63 struct vnode *a_vp; 64 struct thread *a_td; 65 } */ *ap; 66{ 67 struct vnode *vp = ap->a_vp; 68 struct iso_node *ip = VTOI(vp); 69 int error = 0; 70 71 /* 72 * If we are done with the inode, reclaim it 73 * so that it can be reused immediately. 74 */ 75 if (ip->inode.iso_mode == 0) 76 vrecycle(vp); 77 return error; 78} 79 80/* 81 * Reclaim an inode so that it can be used for other purposes. 82 */ 83int 84cd9660_reclaim(ap) 85 struct vop_reclaim_args /* { 86 struct vnode *a_vp; 87 struct thread *a_td; 88 } */ *ap; 89{ 90 struct vnode *vp = ap->a_vp; 91 92 /* 93 * Destroy the vm object and flush associated pages. 94 */ 95 vnode_destroy_vobject(vp); 96 /* 97 * Remove the inode from its hash chain. 98 */ 99 vfs_hash_remove(vp); 100 101 /* 102 * Purge old data structures associated with the inode. 103 */ 104 free(vp->v_data, M_ISOFSNODE); 105 vp->v_data = NULL; 106 return (0); 107} 108 109/* 110 * File attributes 111 */ 112void 113cd9660_defattr(isodir, inop, bp, ftype) 114 struct iso_directory_record *isodir; 115 struct iso_node *inop; 116 struct buf *bp; 117 enum ISO_FTYPE ftype; 118{ 119 struct buf *bp2 = NULL; 120 struct iso_mnt *imp; 121 struct iso_extended_attributes *ap = NULL; 122 int off; 123 124 /* high sierra does not have timezone data, flag is one byte ahead */ 125 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA? 126 &isodir->date[6]: isodir->flags)&2) { 127 inop->inode.iso_mode = S_IFDIR; 128 /* 129 * If we return 2, fts() will assume there are no subdirectories 130 * (just links for the path and .), so instead we return 1. 131 */ 132 inop->inode.iso_links = 1; 133 } else { 134 inop->inode.iso_mode = S_IFREG; 135 inop->inode.iso_links = 1; 136 } 137 if (!bp 138 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 139 && (off = isonum_711(isodir->ext_attr_length))) { 140 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 141 &bp2); 142 bp = bp2; 143 } 144 if (bp) { 145 ap = (struct iso_extended_attributes *)bp->b_data; 146 147 if (isonum_711(ap->version) == 1) { 148 if (!(ap->perm[0]&0x40)) 149 inop->inode.iso_mode |= S_IXOTH; 150 if (!(ap->perm[0]&0x10)) 151 inop->inode.iso_mode |= S_IROTH; 152 if (!(ap->perm[0]&4)) 153 inop->inode.iso_mode |= S_IXGRP; 154 if (!(ap->perm[0]&1)) 155 inop->inode.iso_mode |= S_IRGRP; 156 if (!(ap->perm[1]&0x40)) 157 inop->inode.iso_mode |= S_IXUSR; 158 if (!(ap->perm[1]&0x10)) 159 inop->inode.iso_mode |= S_IRUSR; 160 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 161 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 162 } else 163 ap = NULL; 164 } 165 if (!ap) { 166 inop->inode.iso_mode |= S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 167 inop->inode.iso_uid = (uid_t)0; 168 inop->inode.iso_gid = (gid_t)0; 169 } 170 if (bp2) 171 brelse(bp2); 172} 173 174/* 175 * Time stamps 176 */ 177void 178cd9660_deftstamp(isodir,inop,bp,ftype) 179 struct iso_directory_record *isodir; 180 struct iso_node *inop; 181 struct buf *bp; 182 enum ISO_FTYPE ftype; 183{ 184 struct buf *bp2 = NULL; 185 struct iso_mnt *imp; 186 struct iso_extended_attributes *ap = NULL; 187 int off; 188 189 if (!bp 190 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 191 && (off = isonum_711(isodir->ext_attr_length))) { 192 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 193 &bp2); 194 bp = bp2; 195 } 196 if (bp) { 197 ap = (struct iso_extended_attributes *)bp->b_data; 198 199 if (ftype != ISO_FTYPE_HIGH_SIERRA 200 && isonum_711(ap->version) == 1) { 201 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 202 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 203 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 204 inop->inode.iso_ctime = inop->inode.iso_atime; 205 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 206 inop->inode.iso_mtime = inop->inode.iso_ctime; 207 } else 208 ap = NULL; 209 } 210 if (!ap) { 211 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype); 212 inop->inode.iso_atime = inop->inode.iso_ctime; 213 inop->inode.iso_mtime = inop->inode.iso_ctime; 214 } 215 if (bp2) 216 brelse(bp2); 217} 218 219int 220cd9660_tstamp_conv7(pi,pu,ftype) 221 u_char *pi; 222 struct timespec *pu; 223 enum ISO_FTYPE ftype; 224{ 225 int crtime, days; 226 int y, m, d, hour, minute, second, tz; 227 228 y = pi[0] + 1900; 229 m = pi[1]; 230 d = pi[2]; 231 hour = pi[3]; 232 minute = pi[4]; 233 second = pi[5]; 234 if(ftype != ISO_FTYPE_HIGH_SIERRA) 235 tz = ((signed char *)pi)[6]; /* Timezone value is signed. */ 236 else 237 /* original high sierra misses timezone data */ 238 tz = 0; 239 240 if (y < 1970) { 241 pu->tv_sec = 0; 242 pu->tv_nsec = 0; 243 return 0; 244 } else { 245#ifdef ORIGINAL 246 /* computes day number relative to Sept. 19th,1989 */ 247 /* don't even *THINK* about changing formula. It works! */ 248 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 249#else 250 /* 251 * Changed :-) to make it relative to Jan. 1st, 1970 252 * and to disambiguate negative division 253 */ 254 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 255#endif 256 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 257 258 /* timezone offset is unreliable on some disks */ 259 if (-48 <= tz && tz <= 52) 260 crtime -= tz * 15 * 60; 261 } 262 pu->tv_sec = crtime; 263 pu->tv_nsec = 0; 264 return 1; 265} 266 267static u_int 268cd9660_chars2ui(begin,len) 269 u_char *begin; 270 int len; 271{ 272 u_int rc; 273 274 for (rc = 0; --len >= 0;) { 275 rc *= 10; 276 rc += *begin++ - '0'; 277 } 278 return rc; 279} 280 281int 282cd9660_tstamp_conv17(pi,pu) 283 u_char *pi; 284 struct timespec *pu; 285{ 286 u_char buf[7]; 287 288 /* year:"0001"-"9999" -> -1900 */ 289 buf[0] = cd9660_chars2ui(pi,4) - 1900; 290 291 /* month: " 1"-"12" -> 1 - 12 */ 292 buf[1] = cd9660_chars2ui(pi + 4,2); 293 294 /* day: " 1"-"31" -> 1 - 31 */ 295 buf[2] = cd9660_chars2ui(pi + 6,2); 296 297 /* hour: " 0"-"23" -> 0 - 23 */ 298 buf[3] = cd9660_chars2ui(pi + 8,2); 299 300 /* minute:" 0"-"59" -> 0 - 59 */ 301 buf[4] = cd9660_chars2ui(pi + 10,2); 302 303 /* second:" 0"-"59" -> 0 - 59 */ 304 buf[5] = cd9660_chars2ui(pi + 12,2); 305 306 /* difference of GMT */ 307 buf[6] = pi[16]; 308 309 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT); 310} 311 312ino_t 313isodirino(isodir, imp) 314 struct iso_directory_record *isodir; 315 struct iso_mnt *imp; 316{ 317 ino_t ino; 318 319 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 320 << imp->im_bshift; 321 return (ino); 322} 323