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 8.1 (Berkeley) 01/21/94 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/isofs_node.h> 33 34 extern int enodev (); 35 36 struct vfsops isofs_vfsops = { 37 isofs_mount, 38 isofs_start, 39 isofs_unmount, 40 isofs_root, 41 isofs_quotactl, 42 isofs_statfs, 43 isofs_sync, 44 isofs_vget, 45 isofs_fhtovp, 46 isofs_vptofh, 47 isofs_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 isofs_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("isofs_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 = &isofs_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)isofs_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) isofs_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 isofs_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) isofs_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 = (struct iso_mnt *)malloc(sizeof *isomp,M_ISOFSMNT,M_WAITOK); 276 isomp->logical_block_size = logical_block_size; 277 isomp->volume_space_size = isonum_733 (pri->volume_space_size); 278 bcopy (rootp, isomp->root, sizeof isomp->root); 279 isomp->root_extent = isonum_733 (rootp->extent); 280 isomp->root_size = isonum_733 (rootp->size); 281 282 isomp->im_bmask = logical_block_size - 1; 283 isomp->im_bshift = 0; 284 while ((1 << isomp->im_bshift) < isomp->logical_block_size) 285 isomp->im_bshift++; 286 287 bp->b_flags |= B_AGE; 288 brelse(bp); 289 bp = NULL; 290 291 mp->mnt_data = (qaddr_t)isomp; 292 mp->mnt_stat.f_fsid.val[0] = (long)dev; 293 mp->mnt_stat.f_fsid.val[1] = MOUNT_ISOFS; 294 mp->mnt_maxsymlinklen = 0; 295 mp->mnt_flag |= MNT_LOCAL; 296 isomp->im_mountp = mp; 297 isomp->im_dev = dev; 298 isomp->im_devvp = devvp; 299 300 devvp->v_specflags |= SI_MOUNTEDON; 301 302 /* Check the Rock Ridge Extention support */ 303 if (!(argp->flags & ISOFSMNT_NORRIP)) { 304 if (error = bread (isomp->im_devvp, 305 (isomp->root_extent + isonum_711(rootp->ext_attr_length)) 306 * isomp->logical_block_size / DEV_BSIZE, 307 isomp->logical_block_size,NOCRED,&bp)) 308 goto out; 309 310 rootp = (struct iso_directory_record *)bp->b_un.b_addr; 311 312 if ((isomp->rr_skip = isofs_rrip_offset(rootp,isomp)) < 0) { 313 argp->flags |= ISOFSMNT_NORRIP; 314 } else { 315 argp->flags &= ~ISOFSMNT_GENS; 316 } 317 318 /* 319 * The contents are valid, 320 * but they will get reread as part of another vnode, so... 321 */ 322 bp->b_flags |= B_AGE; 323 brelse(bp); 324 bp = NULL; 325 } 326 isomp->im_flags = argp->flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS|ISOFSMNT_EXTATT); 327 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) { 328 default: 329 isomp->iso_ftype = ISO_FTYPE_DEFAULT; 330 break; 331 case ISOFSMNT_GENS|ISOFSMNT_NORRIP: 332 isomp->iso_ftype = ISO_FTYPE_9660; 333 break; 334 case 0: 335 isomp->iso_ftype = ISO_FTYPE_RRIP; 336 break; 337 } 338 339 return 0; 340 out: 341 if (bp) 342 brelse(bp); 343 if (needclose) 344 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 345 if (isomp) { 346 free((caddr_t)isomp, M_ISOFSMNT); 347 mp->mnt_data = (qaddr_t)0; 348 } 349 return error; 350 } 351 352 /* 353 * Make a filesystem operational. 354 * Nothing to do at the moment. 355 */ 356 /* ARGSUSED */ 357 isofs_start(mp, flags, p) 358 struct mount *mp; 359 int flags; 360 struct proc *p; 361 { 362 return 0; 363 } 364 365 /* 366 * unmount system call 367 */ 368 int 369 isofs_unmount(mp, mntflags, p) 370 struct mount *mp; 371 int mntflags; 372 struct proc *p; 373 { 374 register struct iso_mnt *isomp; 375 int i, error, ronly, flags = 0; 376 377 if (mntflags & MNT_FORCE) { 378 if (!iso_doforce || (mp->mnt_flag & MNT_ROOTFS)) 379 return (EINVAL); 380 flags |= FORCECLOSE; 381 } 382 #if 0 383 mntflushbuf(mp, 0); 384 if (mntinvalbuf(mp)) 385 return EBUSY; 386 #endif 387 if (error = vflush(mp, NULLVP, flags)) 388 return (error); 389 390 isomp = VFSTOISOFS(mp); 391 392 #ifdef ISODEVMAP 393 if (isomp->iso_ftype == ISO_FTYPE_RRIP) 394 iso_dunmap(isomp->im_dev); 395 #endif 396 397 isomp->im_devvp->v_specflags &= ~SI_MOUNTEDON; 398 error = VOP_CLOSE(isomp->im_devvp, FREAD, NOCRED, p); 399 vrele(isomp->im_devvp); 400 free((caddr_t)isomp, M_ISOFSMNT); 401 mp->mnt_data = (qaddr_t)0; 402 mp->mnt_flag &= ~MNT_LOCAL; 403 return (error); 404 } 405 406 /* 407 * Return root of a filesystem 408 */ 409 isofs_root(mp, vpp) 410 struct mount *mp; 411 struct vnode **vpp; 412 { 413 register struct iso_node *ip; 414 struct iso_node tip, *nip; 415 struct vnode tvp; 416 int error; 417 struct iso_mnt *imp = VFSTOISOFS (mp); 418 struct iso_directory_record *dp; 419 420 tvp.v_mount = mp; 421 tvp.v_data = &tip; 422 ip = VTOI(&tvp); 423 ip->i_vnode = &tvp; 424 ip->i_dev = imp->im_dev; 425 ip->i_diroff = 0; 426 dp = (struct iso_directory_record *)imp->root; 427 isodirino(&ip->i_number,dp,imp); 428 429 /* 430 * With RRIP we must use the `.' entry of the root directory. 431 * Simply tell iget, that it's a relocated directory. 432 */ 433 error = iso_iget(ip,ip->i_number, 434 imp->iso_ftype == ISO_FTYPE_RRIP, 435 &nip,dp); 436 if (error) 437 return error; 438 *vpp = ITOV(nip); 439 return 0; 440 } 441 442 /* 443 * Do operations associated with quotas, not supported 444 */ 445 /* ARGSUSED */ 446 int 447 isofs_quotactl(mp, cmd, uid, arg, p) 448 struct mount *mp; 449 int cmd; 450 uid_t uid; 451 caddr_t arg; 452 struct proc *p; 453 { 454 455 return (EOPNOTSUPP); 456 } 457 458 /* 459 * Get file system statistics. 460 */ 461 isofs_statfs(mp, sbp, p) 462 struct mount *mp; 463 register struct statfs *sbp; 464 struct proc *p; 465 { 466 register struct iso_mnt *isomp; 467 register struct fs *fs; 468 469 isomp = VFSTOISOFS(mp); 470 471 sbp->f_type = MOUNT_ISOFS; 472 sbp->f_bsize = isomp->logical_block_size; 473 sbp->f_iosize = sbp->f_bsize; /* XXX */ 474 sbp->f_blocks = isomp->volume_space_size; 475 sbp->f_bfree = 0; /* total free blocks */ 476 sbp->f_bavail = 0; /* blocks free for non superuser */ 477 sbp->f_files = 0; /* total files */ 478 sbp->f_ffree = 0; /* free file nodes */ 479 if (sbp != &mp->mnt_stat) { 480 bcopy((caddr_t)mp->mnt_stat.f_mntonname, 481 (caddr_t)&sbp->f_mntonname[0], MNAMELEN); 482 bcopy((caddr_t)mp->mnt_stat.f_mntfromname, 483 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN); 484 } 485 /* Use the first spare for flags: */ 486 sbp->f_spare[0] = isomp->im_flags; 487 return 0; 488 } 489 490 /* ARGSUSED */ 491 int 492 isofs_sync(mp, waitfor, cred, p) 493 struct mount *mp; 494 int waitfor; 495 struct ucred *cred; 496 struct proc *p; 497 { 498 return (0); 499 } 500 501 /* 502 * Flat namespace lookup. 503 * Currently unsupported. 504 */ 505 /* ARGSUSED */ 506 int 507 isofs_vget(mp, ino, vpp) 508 struct mount *mp; 509 ino_t ino; 510 struct vnode **vpp; 511 { 512 513 return (EOPNOTSUPP); 514 } 515 516 /* 517 * File handle to vnode 518 * 519 * Have to be really careful about stale file handles: 520 * - check that the inode number is in range 521 * - call iget() to get the locked inode 522 * - check for an unallocated inode (i_mode == 0) 523 * - check that the generation number matches 524 */ 525 526 struct ifid { 527 ushort ifid_len; 528 ushort ifid_pad; 529 int ifid_ino; 530 long ifid_start; 531 }; 532 533 /* ARGSUSED */ 534 int 535 isofs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 536 register struct mount *mp; 537 struct fid *fhp; 538 struct mbuf *nam; 539 struct vnode **vpp; 540 int *exflagsp; 541 struct ucred **credanonp; 542 { 543 struct vnode tvp; 544 int error; 545 int lbn, off; 546 struct ifid *ifhp; 547 struct iso_mnt *imp; 548 struct buf *bp; 549 struct iso_directory_record *dirp; 550 struct iso_node tip, *ip, *nip; 551 struct netcred *np; 552 553 imp = VFSTOISOFS (mp); 554 ifhp = (struct ifid *)fhp; 555 556 #ifdef ISOFS_DBG 557 printf("fhtovp: ino %d, start %ld\n", 558 ifhp->ifid_ino, ifhp->ifid_start); 559 #endif 560 561 np = vfs_export_lookup(mp, &imp->im_export, nam); 562 if (np == NULL) 563 return (EACCES); 564 565 lbn = iso_lblkno(imp, ifhp->ifid_ino); 566 if (lbn >= imp->volume_space_size) { 567 printf("fhtovp: lbn exceed volume space %d\n", lbn); 568 return (ESTALE); 569 } 570 571 off = iso_blkoff(imp, ifhp->ifid_ino); 572 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) { 573 printf("fhtovp: crosses block boundary %d\n", 574 off + ISO_DIRECTORY_RECORD_SIZE); 575 return (ESTALE); 576 } 577 578 error = bread(imp->im_devvp, btodb(lbn * imp->logical_block_size), 579 imp->logical_block_size, NOCRED, &bp); 580 if (error) { 581 printf("fhtovp: bread error %d\n",error); 582 brelse(bp); 583 return (error); 584 } 585 586 dirp = (struct iso_directory_record *)(bp->b_un.b_addr + off); 587 if (off + isonum_711(dirp->length) > imp->logical_block_size) { 588 brelse(bp); 589 printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n", 590 off+isonum_711(dirp->length), off, 591 isonum_711(dirp->length)); 592 return (ESTALE); 593 } 594 595 if (isonum_733(dirp->extent) + isonum_711(dirp->ext_attr_length) != 596 ifhp->ifid_start) { 597 brelse(bp); 598 printf("fhtovp: file start miss %d vs %d\n", 599 isonum_733(dirp->extent)+isonum_711(dirp->ext_attr_length), 600 ifhp->ifid_start); 601 return (ESTALE); 602 } 603 brelse(bp); 604 605 ip = &tip; 606 tvp.v_mount = mp; 607 tvp.v_data = ip; 608 ip->i_vnode = &tvp; 609 ip->i_dev = imp->im_dev; 610 if (error = iso_iget(ip, ifhp->ifid_ino, 0, &nip, dirp)) { 611 *vpp = NULLVP; 612 printf("fhtovp: failed to get inode\n"); 613 return (error); 614 } 615 ip = nip; 616 /* 617 * XXX need generation number? 618 */ 619 if (ip->inode.iso_mode == 0) { 620 iso_iput(ip); 621 *vpp = NULLVP; 622 printf("fhtovp: inode mode == 0\n"); 623 return (ESTALE); 624 } 625 *vpp = ITOV(ip); 626 *exflagsp = np->netc_exflags; 627 *credanonp = &np->netc_anon; 628 return 0; 629 } 630 631 /* 632 * Vnode pointer to File handle 633 */ 634 /* ARGSUSED */ 635 isofs_vptofh(vp, fhp) 636 struct vnode *vp; 637 struct fid *fhp; 638 { 639 register struct iso_node *ip = VTOI(vp); 640 register struct ifid *ifhp; 641 register struct iso_mnt *mp = ip->i_mnt; 642 643 ifhp = (struct ifid *)fhp; 644 ifhp->ifid_len = sizeof(struct ifid); 645 646 ifhp->ifid_ino = ip->i_number; 647 ifhp->ifid_start = ip->iso_start; 648 649 #ifdef ISOFS_DBG 650 printf("vptofh: ino %d, start %ld\n", 651 ifhp->ifid_ino,ifhp->ifid_start); 652 #endif 653 return 0; 654 } 655