1 /*- 2 * Copyright (c) 1994 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 * %sccs.include.redist.c% 11 * 12 * @(#)cd9660_vfsops.c 8.3 (Berkeley) 01/31/94 13 */ 14 15 #include <sys/param.h> 16 #include <sys/systm.h> 17 #include <sys/namei.h> 18 #include <sys/proc.h> 19 #include <sys/kernel.h> 20 #include <sys/vnode.h> 21 #include <miscfs/specfs/specdev.h> 22 #include <sys/mount.h> 23 #include <sys/buf.h> 24 #include <sys/file.h> 25 #include <sys/dkbad.h> 26 #include <sys/disklabel.h> 27 #include <sys/ioctl.h> 28 #include <sys/errno.h> 29 #include <sys/malloc.h> 30 31 #include <isofs/cd9660/iso.h> 32 #include <isofs/cd9660/cd9660_node.h> 33 34 extern int enodev (); 35 36 struct vfsops cd9660_vfsops = { 37 cd9660_mount, 38 cd9660_start, 39 cd9660_unmount, 40 cd9660_root, 41 cd9660_quotactl, 42 cd9660_statfs, 43 cd9660_sync, 44 cd9660_vget, 45 cd9660_fhtovp, 46 cd9660_vptofh, 47 cd9660_init, 48 }; 49 50 /* 51 * Called by vfs_mountroot when iso is going to be mounted as root. 52 * 53 * Name is updated by mount(8) after booting. 54 */ 55 #define ROOTNAME "root_device" 56 57 static iso_mountfs(); 58 59 cd9660_mountroot() 60 { 61 register struct mount *mp; 62 extern struct vnode *rootvp; 63 struct proc *p = curproc; /* XXX */ 64 struct iso_mnt *imp; 65 register struct fs *fs; 66 u_int size; 67 int error; 68 struct iso_args args; 69 70 /* 71 * Get vnodes for swapdev and rootdev. 72 */ 73 if (bdevvp(swapdev, &swapdev_vp) || bdevvp(rootdev, &rootvp)) 74 panic("cd9660_mountroot: can't setup bdevvp's"); 75 76 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 77 bzero((char *)mp, (u_long)sizeof(struct mount)); 78 mp->mnt_op = &cd9660_vfsops; 79 mp->mnt_flag = MNT_RDONLY; 80 args.flags = ISOFSMNT_ROOT; 81 if (error = iso_mountfs(rootvp, mp, p, &args)) { 82 free(mp, M_MOUNT); 83 return (error); 84 } 85 if (error = vfs_lock(mp)) { 86 (void)cd9660_unmount(mp, 0, p); 87 free(mp, M_MOUNT); 88 return (error); 89 } 90 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 91 mp->mnt_flag |= MNT_ROOTFS; 92 mp->mnt_vnodecovered = NULLVP; 93 imp = VFSTOISOFS(mp); 94 bzero(imp->im_fsmnt, sizeof(imp->im_fsmnt)); 95 imp->im_fsmnt[0] = '/'; 96 bcopy((caddr_t)imp->im_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 97 MNAMELEN); 98 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 99 &size); 100 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 101 (void) cd9660_statfs(mp, &mp->mnt_stat, p); 102 vfs_unlock(mp); 103 return (0); 104 } 105 106 /* 107 * Flag to allow forcible unmounting. 108 */ 109 int iso_doforce = 1; 110 111 /* 112 * VFS Operations. 113 * 114 * mount system call 115 */ 116 cd9660_mount(mp, path, data, ndp, p) 117 register struct mount *mp; 118 char *path; 119 caddr_t data; 120 struct nameidata *ndp; 121 struct proc *p; 122 { 123 struct vnode *devvp; 124 struct iso_args args; 125 u_int size; 126 int error; 127 struct iso_mnt *imp; 128 129 if (error = copyin(data, (caddr_t)&args, sizeof (struct iso_args))) 130 return (error); 131 132 if ((mp->mnt_flag & MNT_RDONLY) == 0) 133 return (EROFS); 134 135 /* 136 * If updating, check whether changing from read-only to 137 * read/write; if there is no device name, that's all we do. 138 */ 139 if (mp->mnt_flag & MNT_UPDATE) { 140 imp = VFSTOISOFS(mp); 141 if (args.fspec == 0) 142 return (vfs_export(mp, &imp->im_export, &args.export)); 143 } 144 /* 145 * Not an update, or updating the name: look up the name 146 * and verify that it refers to a sensible block device. 147 */ 148 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 149 if (error = namei(ndp)) 150 return (error); 151 devvp = ndp->ni_vp; 152 153 if (devvp->v_type != VBLK) { 154 vrele(devvp); 155 return ENOTBLK; 156 } 157 if (major(devvp->v_rdev) >= nblkdev) { 158 vrele(devvp); 159 return ENXIO; 160 } 161 if ((mp->mnt_flag & MNT_UPDATE) == 0) 162 error = iso_mountfs(devvp, mp, p, &args); 163 else { 164 if (devvp != imp->im_devvp) 165 error = EINVAL; /* needs translation */ 166 else 167 vrele(devvp); 168 } 169 if (error) { 170 vrele(devvp); 171 return error; 172 } 173 imp = VFSTOISOFS(mp); 174 (void) copyinstr(path, imp->im_fsmnt, sizeof(imp->im_fsmnt)-1, &size); 175 bzero(imp->im_fsmnt + size, sizeof(imp->im_fsmnt) - size); 176 bcopy((caddr_t)imp->im_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 177 MNAMELEN); 178 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 179 &size); 180 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 181 (void) cd9660_statfs(mp, &mp->mnt_stat, p); 182 return 0; 183 } 184 185 /* 186 * Common code for mount and mountroot 187 */ 188 static iso_mountfs(devvp, mp, p, argp) 189 register struct vnode *devvp; 190 struct mount *mp; 191 struct proc *p; 192 struct iso_args *argp; 193 { 194 register struct iso_mnt *isomp = (struct iso_mnt *)0; 195 struct buf *bp = NULL; 196 dev_t dev = devvp->v_rdev; 197 caddr_t base, space; 198 int havepart = 0, blks; 199 int error = EINVAL, i, size; 200 int needclose = 0; 201 int ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 202 extern struct vnode *rootvp; 203 int j; 204 int iso_bsize; 205 int iso_blknum; 206 struct iso_volume_descriptor *vdp; 207 struct iso_primary_descriptor *pri; 208 struct iso_directory_record *rootp; 209 int logical_block_size; 210 211 if (!ronly) 212 return EROFS; 213 214 /* 215 * Disallow multiple mounts of the same device. 216 * Disallow mounting of a device that is currently in use 217 * (except for root, which might share swap device for miniroot). 218 * Flush out any old buffers remaining from a previous use. 219 */ 220 if (error = vfs_mountedon(devvp)) 221 return error; 222 if (vcount(devvp) > 1 && devvp != rootvp) 223 return EBUSY; 224 if (error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)) 225 return (error); 226 227 if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p)) 228 return error; 229 needclose = 1; 230 231 /* This is the "logical sector size". The standard says this 232 * should be 2048 or the physical sector size on the device, 233 * whichever is greater. For now, we'll just use a constant. 234 */ 235 iso_bsize = ISO_DEFAULT_BLOCK_SIZE; 236 237 for (iso_blknum = 16; iso_blknum < 100; iso_blknum++) { 238 if (error = bread (devvp, btodb(iso_blknum * iso_bsize), 239 iso_bsize, NOCRED, &bp)) 240 goto out; 241 242 vdp = (struct iso_volume_descriptor *)bp->b_un.b_addr; 243 if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) { 244 error = EINVAL; 245 goto out; 246 } 247 248 if (isonum_711 (vdp->type) == ISO_VD_END) { 249 error = EINVAL; 250 goto out; 251 } 252 253 if (isonum_711 (vdp->type) == ISO_VD_PRIMARY) 254 break; 255 brelse(bp); 256 } 257 258 if (isonum_711 (vdp->type) != ISO_VD_PRIMARY) { 259 error = EINVAL; 260 goto out; 261 } 262 263 pri = (struct iso_primary_descriptor *)vdp; 264 265 logical_block_size = isonum_723 (pri->logical_block_size); 266 267 if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE 268 || (logical_block_size & (logical_block_size - 1)) != 0) { 269 error = EINVAL; 270 goto out; 271 } 272 273 rootp = (struct iso_directory_record *)pri->root_directory_record; 274 275 isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK); 276 bzero((caddr_t)isomp, sizeof *isomp); 277 isomp->logical_block_size = logical_block_size; 278 isomp->volume_space_size = isonum_733 (pri->volume_space_size); 279 bcopy (rootp, isomp->root, sizeof isomp->root); 280 isomp->root_extent = isonum_733 (rootp->extent); 281 isomp->root_size = isonum_733 (rootp->size); 282 283 isomp->im_bmask = logical_block_size - 1; 284 isomp->im_bshift = 0; 285 while ((1 << isomp->im_bshift) < isomp->logical_block_size) 286 isomp->im_bshift++; 287 288 bp->b_flags |= B_AGE; 289 brelse(bp); 290 bp = NULL; 291 292 mp->mnt_data = (qaddr_t)isomp; 293 mp->mnt_stat.f_fsid.val[0] = (long)dev; 294 mp->mnt_stat.f_fsid.val[1] = MOUNT_CD9660; 295 mp->mnt_maxsymlinklen = 0; 296 mp->mnt_flag |= MNT_LOCAL; 297 isomp->im_mountp = mp; 298 isomp->im_dev = dev; 299 isomp->im_devvp = devvp; 300 301 devvp->v_specflags |= SI_MOUNTEDON; 302 303 /* Check the Rock Ridge Extention support */ 304 if (!(argp->flags & ISOFSMNT_NORRIP)) { 305 if (error = bread (isomp->im_devvp, 306 (isomp->root_extent + isonum_711(rootp->ext_attr_length)) 307 * isomp->logical_block_size / DEV_BSIZE, 308 isomp->logical_block_size,NOCRED,&bp)) 309 goto out; 310 311 rootp = (struct iso_directory_record *)bp->b_un.b_addr; 312 313 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) { 314 argp->flags |= ISOFSMNT_NORRIP; 315 } else { 316 argp->flags &= ~ISOFSMNT_GENS; 317 } 318 319 /* 320 * The contents are valid, 321 * but they will get reread as part of another vnode, so... 322 */ 323 bp->b_flags |= B_AGE; 324 brelse(bp); 325 bp = NULL; 326 } 327 isomp->im_flags = argp->flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS|ISOFSMNT_EXTATT); 328 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) { 329 default: 330 isomp->iso_ftype = ISO_FTYPE_DEFAULT; 331 break; 332 case ISOFSMNT_GENS|ISOFSMNT_NORRIP: 333 isomp->iso_ftype = ISO_FTYPE_9660; 334 break; 335 case 0: 336 isomp->iso_ftype = ISO_FTYPE_RRIP; 337 break; 338 } 339 340 return 0; 341 out: 342 if (bp) 343 brelse(bp); 344 if (needclose) 345 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 346 if (isomp) { 347 free((caddr_t)isomp, M_ISOFSMNT); 348 mp->mnt_data = (qaddr_t)0; 349 } 350 return error; 351 } 352 353 /* 354 * Make a filesystem operational. 355 * Nothing to do at the moment. 356 */ 357 /* ARGSUSED */ 358 cd9660_start(mp, flags, p) 359 struct mount *mp; 360 int flags; 361 struct proc *p; 362 { 363 return 0; 364 } 365 366 /* 367 * unmount system call 368 */ 369 int 370 cd9660_unmount(mp, mntflags, p) 371 struct mount *mp; 372 int mntflags; 373 struct proc *p; 374 { 375 register struct iso_mnt *isomp; 376 int i, error, ronly, flags = 0; 377 378 if (mntflags & MNT_FORCE) { 379 if (!iso_doforce || (mp->mnt_flag & MNT_ROOTFS)) 380 return (EINVAL); 381 flags |= FORCECLOSE; 382 } 383 #if 0 384 mntflushbuf(mp, 0); 385 if (mntinvalbuf(mp)) 386 return EBUSY; 387 #endif 388 if (error = vflush(mp, NULLVP, flags)) 389 return (error); 390 391 isomp = VFSTOISOFS(mp); 392 393 #ifdef ISODEVMAP 394 if (isomp->iso_ftype == ISO_FTYPE_RRIP) 395 iso_dunmap(isomp->im_dev); 396 #endif 397 398 isomp->im_devvp->v_specflags &= ~SI_MOUNTEDON; 399 error = VOP_CLOSE(isomp->im_devvp, FREAD, NOCRED, p); 400 vrele(isomp->im_devvp); 401 free((caddr_t)isomp, M_ISOFSMNT); 402 mp->mnt_data = (qaddr_t)0; 403 mp->mnt_flag &= ~MNT_LOCAL; 404 return (error); 405 } 406 407 /* 408 * Return root of a filesystem 409 */ 410 cd9660_root(mp, vpp) 411 struct mount *mp; 412 struct vnode **vpp; 413 { 414 register struct iso_node *ip; 415 struct iso_node tip, *nip; 416 struct vnode tvp; 417 int error; 418 struct iso_mnt *imp = VFSTOISOFS (mp); 419 struct iso_directory_record *dp; 420 421 tvp.v_mount = mp; 422 tvp.v_data = &tip; 423 ip = VTOI(&tvp); 424 ip->i_vnode = &tvp; 425 ip->i_dev = imp->im_dev; 426 ip->i_diroff = 0; 427 dp = (struct iso_directory_record *)imp->root; 428 isodirino(&ip->i_number,dp,imp); 429 430 /* 431 * With RRIP we must use the `.' entry of the root directory. 432 * Simply tell iget, that it's a relocated directory. 433 */ 434 error = iso_iget(ip,ip->i_number, 435 imp->iso_ftype == ISO_FTYPE_RRIP, 436 &nip,dp); 437 if (error) 438 return error; 439 *vpp = ITOV(nip); 440 return 0; 441 } 442 443 /* 444 * Do operations associated with quotas, not supported 445 */ 446 /* ARGSUSED */ 447 int 448 cd9660_quotactl(mp, cmd, uid, arg, p) 449 struct mount *mp; 450 int cmd; 451 uid_t uid; 452 caddr_t arg; 453 struct proc *p; 454 { 455 456 return (EOPNOTSUPP); 457 } 458 459 /* 460 * Get file system statistics. 461 */ 462 cd9660_statfs(mp, sbp, p) 463 struct mount *mp; 464 register struct statfs *sbp; 465 struct proc *p; 466 { 467 register struct iso_mnt *isomp; 468 register struct fs *fs; 469 470 isomp = VFSTOISOFS(mp); 471 472 sbp->f_type = MOUNT_CD9660; 473 sbp->f_bsize = isomp->logical_block_size; 474 sbp->f_iosize = sbp->f_bsize; /* XXX */ 475 sbp->f_blocks = isomp->volume_space_size; 476 sbp->f_bfree = 0; /* total free blocks */ 477 sbp->f_bavail = 0; /* blocks free for non superuser */ 478 sbp->f_files = 0; /* total files */ 479 sbp->f_ffree = 0; /* free file nodes */ 480 if (sbp != &mp->mnt_stat) { 481 bcopy((caddr_t)mp->mnt_stat.f_mntonname, 482 (caddr_t)&sbp->f_mntonname[0], MNAMELEN); 483 bcopy((caddr_t)mp->mnt_stat.f_mntfromname, 484 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN); 485 } 486 /* Use the first spare for flags: */ 487 sbp->f_spare[0] = isomp->im_flags; 488 return 0; 489 } 490 491 /* ARGSUSED */ 492 int 493 cd9660_sync(mp, waitfor, cred, p) 494 struct mount *mp; 495 int waitfor; 496 struct ucred *cred; 497 struct proc *p; 498 { 499 return (0); 500 } 501 502 /* 503 * Flat namespace lookup. 504 * Currently unsupported. 505 */ 506 /* ARGSUSED */ 507 int 508 cd9660_vget(mp, ino, vpp) 509 struct mount *mp; 510 ino_t ino; 511 struct vnode **vpp; 512 { 513 514 return (EOPNOTSUPP); 515 } 516 517 /* 518 * File handle to vnode 519 * 520 * Have to be really careful about stale file handles: 521 * - check that the inode number is in range 522 * - call iget() to get the locked inode 523 * - check for an unallocated inode (i_mode == 0) 524 * - check that the generation number matches 525 */ 526 527 struct ifid { 528 ushort ifid_len; 529 ushort ifid_pad; 530 int ifid_ino; 531 long ifid_start; 532 }; 533 534 /* ARGSUSED */ 535 int 536 cd9660_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 537 register struct mount *mp; 538 struct fid *fhp; 539 struct mbuf *nam; 540 struct vnode **vpp; 541 int *exflagsp; 542 struct ucred **credanonp; 543 { 544 struct vnode tvp; 545 int error; 546 int lbn, off; 547 struct ifid *ifhp; 548 struct iso_mnt *imp; 549 struct buf *bp; 550 struct iso_directory_record *dirp; 551 struct iso_node tip, *ip, *nip; 552 struct netcred *np; 553 554 imp = VFSTOISOFS (mp); 555 ifhp = (struct ifid *)fhp; 556 557 #ifdef ISOFS_DBG 558 printf("fhtovp: ino %d, start %ld\n", 559 ifhp->ifid_ino, ifhp->ifid_start); 560 #endif 561 562 np = vfs_export_lookup(mp, &imp->im_export, nam); 563 if (np == NULL) 564 return (EACCES); 565 566 lbn = iso_lblkno(imp, ifhp->ifid_ino); 567 if (lbn >= imp->volume_space_size) { 568 printf("fhtovp: lbn exceed volume space %d\n", lbn); 569 return (ESTALE); 570 } 571 572 off = iso_blkoff(imp, ifhp->ifid_ino); 573 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) { 574 printf("fhtovp: crosses block boundary %d\n", 575 off + ISO_DIRECTORY_RECORD_SIZE); 576 return (ESTALE); 577 } 578 579 error = bread(imp->im_devvp, btodb(lbn * imp->logical_block_size), 580 imp->logical_block_size, NOCRED, &bp); 581 if (error) { 582 printf("fhtovp: bread error %d\n",error); 583 brelse(bp); 584 return (error); 585 } 586 587 dirp = (struct iso_directory_record *)(bp->b_un.b_addr + off); 588 if (off + isonum_711(dirp->length) > imp->logical_block_size) { 589 brelse(bp); 590 printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n", 591 off+isonum_711(dirp->length), off, 592 isonum_711(dirp->length)); 593 return (ESTALE); 594 } 595 596 if (isonum_733(dirp->extent) + isonum_711(dirp->ext_attr_length) != 597 ifhp->ifid_start) { 598 brelse(bp); 599 printf("fhtovp: file start miss %d vs %d\n", 600 isonum_733(dirp->extent)+isonum_711(dirp->ext_attr_length), 601 ifhp->ifid_start); 602 return (ESTALE); 603 } 604 brelse(bp); 605 606 ip = &tip; 607 tvp.v_mount = mp; 608 tvp.v_data = ip; 609 ip->i_vnode = &tvp; 610 ip->i_dev = imp->im_dev; 611 if (error = iso_iget(ip, ifhp->ifid_ino, 0, &nip, dirp)) { 612 *vpp = NULLVP; 613 printf("fhtovp: failed to get inode\n"); 614 return (error); 615 } 616 ip = nip; 617 /* 618 * XXX need generation number? 619 */ 620 if (ip->inode.iso_mode == 0) { 621 iso_iput(ip); 622 *vpp = NULLVP; 623 printf("fhtovp: inode mode == 0\n"); 624 return (ESTALE); 625 } 626 *vpp = ITOV(ip); 627 *exflagsp = np->netc_exflags; 628 *credanonp = &np->netc_anon; 629 return 0; 630 } 631 632 /* 633 * Vnode pointer to File handle 634 */ 635 /* ARGSUSED */ 636 cd9660_vptofh(vp, fhp) 637 struct vnode *vp; 638 struct fid *fhp; 639 { 640 register struct iso_node *ip = VTOI(vp); 641 register struct ifid *ifhp; 642 register struct iso_mnt *mp = ip->i_mnt; 643 644 ifhp = (struct ifid *)fhp; 645 ifhp->ifid_len = sizeof(struct ifid); 646 647 ifhp->ifid_ino = ip->i_number; 648 ifhp->ifid_start = ip->iso_start; 649 650 #ifdef ISOFS_DBG 651 printf("vptofh: ino %d, start %ld\n", 652 ifhp->ifid_ino,ifhp->ifid_start); 653 #endif 654 return 0; 655 } 656