| 1 | /* $NetBSD: cd9660_node.c,v 1.35 2016/08/20 12:37:06 hannken 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@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 8.8 (Berkeley) 5/22/95 |
| 37 | */ |
| 38 | |
| 39 | #include <sys/cdefs.h> |
| 40 | __KERNEL_RCSID(0, "$NetBSD: cd9660_node.c,v 1.35 2016/08/20 12:37:06 hannken 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_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 | VOP_UNLOCK(vp); |
| 120 | return error; |
| 121 | } |
| 122 | |
| 123 | /* |
| 124 | * Reclaim an inode so that it can be used for other purposes. |
| 125 | */ |
| 126 | int |
| 127 | cd9660_reclaim(void *v) |
| 128 | { |
| 129 | struct vop_reclaim_args /* { |
| 130 | struct vnode *a_vp; |
| 131 | struct lwp *a_l; |
| 132 | } */ *ap = v; |
| 133 | struct vnode *vp = ap->a_vp; |
| 134 | |
| 135 | if (prtactive && vp->v_usecount > 1) |
| 136 | vprint("cd9660_reclaim: pushing active" , vp); |
| 137 | /* |
| 138 | * Purge old data structures associated with the inode. |
| 139 | */ |
| 140 | genfs_node_destroy(vp); |
| 141 | pool_put(&cd9660_node_pool, vp->v_data); |
| 142 | vp->v_data = NULL; |
| 143 | return (0); |
| 144 | } |
| 145 | |
| 146 | /* |
| 147 | * File attributes |
| 148 | */ |
| 149 | void |
| 150 | cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop, |
| 151 | struct buf *bp) |
| 152 | { |
| 153 | struct buf *bp2 = NULL; |
| 154 | struct iso_mnt *imp; |
| 155 | struct iso_extended_attributes *ap = NULL; |
| 156 | int off; |
| 157 | |
| 158 | if (isonum_711(isodir->flags)&2) { |
| 159 | inop->inode.iso_mode = S_IFDIR; |
| 160 | /* |
| 161 | * If we return 2, fts() will assume there are no subdirectories |
| 162 | * (just links for the path and .), so instead we return 1. |
| 163 | */ |
| 164 | inop->inode.iso_links = 1; |
| 165 | } else { |
| 166 | inop->inode.iso_mode = S_IFREG; |
| 167 | inop->inode.iso_links = 1; |
| 168 | } |
| 169 | if (!bp |
| 170 | && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) |
| 171 | && (off = isonum_711(isodir->ext_attr_length))) { |
| 172 | cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), |
| 173 | NULL, &bp2); |
| 174 | bp = bp2; |
| 175 | } |
| 176 | if (bp) { |
| 177 | ap = (struct iso_extended_attributes *)bp->b_data; |
| 178 | |
| 179 | if (isonum_711(ap->version) == 1) { |
| 180 | if (!(ap->perm[1]&0x10)) |
| 181 | inop->inode.iso_mode |= S_IRUSR; |
| 182 | if (!(ap->perm[1]&0x40)) |
| 183 | inop->inode.iso_mode |= S_IXUSR; |
| 184 | if (!(ap->perm[0]&0x01)) |
| 185 | inop->inode.iso_mode |= S_IRGRP; |
| 186 | if (!(ap->perm[0]&0x04)) |
| 187 | inop->inode.iso_mode |= S_IXGRP; |
| 188 | if (!(ap->perm[0]&0x10)) |
| 189 | inop->inode.iso_mode |= S_IROTH; |
| 190 | if (!(ap->perm[0]&0x40)) |
| 191 | inop->inode.iso_mode |= S_IXOTH; |
| 192 | inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ |
| 193 | inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ |
| 194 | } else |
| 195 | ap = NULL; |
| 196 | } |
| 197 | if (!ap) { |
| 198 | inop->inode.iso_mode |= |
| 199 | S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; |
| 200 | inop->inode.iso_uid = (uid_t)0; |
| 201 | inop->inode.iso_gid = (gid_t)0; |
| 202 | } |
| 203 | if (bp2) |
| 204 | brelse(bp2, 0); |
| 205 | } |
| 206 | |
| 207 | /* |
| 208 | * Time stamps |
| 209 | */ |
| 210 | void |
| 211 | cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop, |
| 212 | struct buf *bp) |
| 213 | { |
| 214 | struct buf *bp2 = NULL; |
| 215 | struct iso_mnt *imp; |
| 216 | struct iso_extended_attributes *ap = NULL; |
| 217 | int off; |
| 218 | |
| 219 | if (!bp |
| 220 | && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) |
| 221 | && (off = isonum_711(isodir->ext_attr_length))) { |
| 222 | cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), |
| 223 | NULL, &bp2); |
| 224 | bp = bp2; |
| 225 | } |
| 226 | if (bp) { |
| 227 | ap = (struct iso_extended_attributes *)bp->b_data; |
| 228 | |
| 229 | if (isonum_711(ap->version) == 1) { |
| 230 | if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) |
| 231 | cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); |
| 232 | if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) |
| 233 | inop->inode.iso_ctime = inop->inode.iso_atime; |
| 234 | if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) |
| 235 | inop->inode.iso_mtime = inop->inode.iso_ctime; |
| 236 | } else |
| 237 | ap = NULL; |
| 238 | } |
| 239 | if (!ap) { |
| 240 | cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime); |
| 241 | inop->inode.iso_atime = inop->inode.iso_ctime; |
| 242 | inop->inode.iso_mtime = inop->inode.iso_ctime; |
| 243 | } |
| 244 | if (bp2) |
| 245 | brelse(bp2, 0); |
| 246 | } |
| 247 | |
| 248 | int |
| 249 | cd9660_tstamp_conv7(const u_char *pi, struct timespec *pu) |
| 250 | { |
| 251 | int crtime, days; |
| 252 | int y, m, d, hour, minute, second, tz; |
| 253 | |
| 254 | y = pi[0] + 1900; |
| 255 | m = pi[1]; |
| 256 | d = pi[2]; |
| 257 | hour = pi[3]; |
| 258 | minute = pi[4]; |
| 259 | second = pi[5]; |
| 260 | tz = pi[6]; |
| 261 | |
| 262 | if (y < 1970) { |
| 263 | pu->tv_sec = 0; |
| 264 | pu->tv_nsec = 0; |
| 265 | return 0; |
| 266 | } else { |
| 267 | #ifdef ORIGINAL |
| 268 | /* computes day number relative to Sept. 19th,1989 */ |
| 269 | /* don't even *THINK* about changing formula. It works! */ |
| 270 | days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; |
| 271 | #else |
| 272 | /* |
| 273 | * Changed :-) to make it relative to Jan. 1st, 1970 |
| 274 | * and to disambiguate negative division |
| 275 | */ |
| 276 | days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; |
| 277 | #endif |
| 278 | crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; |
| 279 | |
| 280 | /* timezone offset is unreliable on some disks */ |
| 281 | if (-48 <= tz && tz <= 52) |
| 282 | crtime -= tz * 15 * 60; |
| 283 | } |
| 284 | pu->tv_sec = crtime; |
| 285 | pu->tv_nsec = 0; |
| 286 | return 1; |
| 287 | } |
| 288 | |
| 289 | static u_int |
| 290 | cd9660_chars2ui(const u_char *begin, int len) |
| 291 | { |
| 292 | u_int rc; |
| 293 | |
| 294 | for (rc = 0; --len >= 0;) { |
| 295 | rc *= 10; |
| 296 | rc += *begin++ - '0'; |
| 297 | } |
| 298 | return rc; |
| 299 | } |
| 300 | |
| 301 | int |
| 302 | cd9660_tstamp_conv17(const u_char *pi, struct timespec *pu) |
| 303 | { |
| 304 | u_char tbuf[7]; |
| 305 | |
| 306 | /* year:"0001"-"9999" -> -1900 */ |
| 307 | tbuf[0] = cd9660_chars2ui(pi,4) - 1900; |
| 308 | |
| 309 | /* month: " 1"-"12" -> 1 - 12 */ |
| 310 | tbuf[1] = cd9660_chars2ui(pi + 4,2); |
| 311 | |
| 312 | /* day: " 1"-"31" -> 1 - 31 */ |
| 313 | tbuf[2] = cd9660_chars2ui(pi + 6,2); |
| 314 | |
| 315 | /* hour: " 0"-"23" -> 0 - 23 */ |
| 316 | tbuf[3] = cd9660_chars2ui(pi + 8,2); |
| 317 | |
| 318 | /* minute:" 0"-"59" -> 0 - 59 */ |
| 319 | tbuf[4] = cd9660_chars2ui(pi + 10,2); |
| 320 | |
| 321 | /* second:" 0"-"59" -> 0 - 59 */ |
| 322 | tbuf[5] = cd9660_chars2ui(pi + 12,2); |
| 323 | |
| 324 | /* difference of GMT */ |
| 325 | tbuf[6] = pi[16]; |
| 326 | |
| 327 | return cd9660_tstamp_conv7(tbuf,pu); |
| 328 | } |
| 329 | |
| 330 | ino_t |
| 331 | isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp) |
| 332 | { |
| 333 | ino_t ino; |
| 334 | |
| 335 | /* |
| 336 | * Note there is an inverse calculation in |
| 337 | * cd9660_vfsops.c:cd9660_loadvnode(): |
| 338 | * ip->iso_start = ino >> imp->im_bshift; |
| 339 | * and also a calculation of the isodir pointer |
| 340 | * from an inode in cd9660_vnops.c:cd9660_readlink() |
| 341 | */ |
| 342 | ino = ((ino_t)isonum_733(isodir->extent) + |
| 343 | isonum_711(isodir->ext_attr_length)) << imp->im_bshift; |
| 344 | return ino; |
| 345 | } |
| 346 | |