advfsops.c revision 1.52
1 /* $NetBSD: advfsops.c,v 1.52 2008/05/16 09:21:59 hannken Exp $ */ 2 3 /* 4 * Copyright (c) 1994 Christian E. Hopps 5 * Copyright (c) 1996 Matthias Scheler 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Christian E. Hopps. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: advfsops.c,v 1.52 2008/05/16 09:21:59 hannken Exp $"); 36 37 #if defined(_KERNEL_OPT) 38 #include "opt_compat_netbsd.h" 39 #endif 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/sysctl.h> 44 #include <sys/vnode.h> 45 #include <sys/mount.h> 46 #include <sys/proc.h> 47 #include <sys/time.h> 48 #include <sys/malloc.h> 49 #include <sys/pool.h> 50 #include <sys/disklabel.h> 51 #include <miscfs/genfs/genfs.h> 52 #include <miscfs/specfs/specdev.h> /* XXX */ 53 #include <sys/fcntl.h> 54 #include <sys/namei.h> 55 #include <sys/ioctl.h> 56 #include <sys/queue.h> 57 #include <sys/buf.h> 58 #include <sys/conf.h> 59 #include <sys/kauth.h> 60 #include <sys/simplelock.h> 61 #include <sys/module.h> 62 #include <fs/adosfs/adosfs.h> 63 64 MODULE(MODULE_CLASS_VFS, adosfs, NULL); 65 66 VFS_PROTOS(adosfs); 67 68 int adosfs_mountfs __P((struct vnode *, struct mount *, struct lwp *)); 69 int adosfs_loadbitmap __P((struct adosfsmount *)); 70 71 struct simplelock adosfs_hashlock; 72 73 struct pool adosfs_node_pool; 74 75 MALLOC_JUSTDEFINE(M_ADOSFSMNT, "adosfs mount", "adosfs mount structures"); 76 MALLOC_JUSTDEFINE(M_ANODE, "adosfs anode","adosfs anode structures and tables"); 77 MALLOC_JUSTDEFINE(M_ADOSFSBITMAP, "adosfs bitmap", "adosfs bitmap"); 78 79 static const struct genfs_ops adosfs_genfsops = { 80 .gop_size = genfs_size, 81 }; 82 83 int (**adosfs_vnodeop_p) __P((void *)); 84 85 int 86 adosfs_mount(mp, path, data, data_len) 87 struct mount *mp; 88 const char *path; 89 void *data; 90 size_t *data_len; 91 { 92 struct lwp *l = curlwp; 93 struct nameidata nd; 94 struct vnode *devvp; 95 struct adosfs_args *args = data; 96 struct adosfsmount *amp; 97 int error; 98 mode_t accessmode; 99 100 if (*data_len < sizeof *args) 101 return EINVAL; 102 103 if (mp->mnt_flag & MNT_GETARGS) { 104 amp = VFSTOADOSFS(mp); 105 if (amp == NULL) 106 return EIO; 107 args->uid = amp->uid; 108 args->gid = amp->gid; 109 args->mask = amp->mask; 110 args->fspec = NULL; 111 *data_len = sizeof *args; 112 return 0; 113 } 114 115 if ((mp->mnt_flag & MNT_RDONLY) == 0) 116 return (EROFS); 117 118 if ((mp->mnt_flag & MNT_UPDATE) && args->fspec == NULL) 119 return EOPNOTSUPP; 120 121 /* 122 * Not an update, or updating the name: look up the name 123 * and verify that it refers to a sensible block device. 124 */ 125 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, args->fspec); 126 if ((error = namei(&nd)) != 0) 127 return (error); 128 devvp = nd.ni_vp; 129 130 if (devvp->v_type != VBLK) { 131 vrele(devvp); 132 return (ENOTBLK); 133 } 134 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 135 vrele(devvp); 136 return (ENXIO); 137 } 138 /* 139 * If mount by non-root, then verify that user has necessary 140 * permissions on the device. 141 */ 142 if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, NULL)) { 143 accessmode = VREAD; 144 if ((mp->mnt_flag & MNT_RDONLY) == 0) 145 accessmode |= VWRITE; 146 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 147 error = VOP_ACCESS(devvp, accessmode, l->l_cred); 148 if (error) { 149 vput(devvp); 150 return (error); 151 } 152 VOP_UNLOCK(devvp, 0); 153 } 154 /* MNT_UPDATE? */ 155 if ((error = adosfs_mountfs(devvp, mp, l)) != 0) { 156 vrele(devvp); 157 return (error); 158 } 159 amp = VFSTOADOSFS(mp); 160 amp->uid = args->uid; 161 amp->gid = args->gid; 162 amp->mask = args->mask; 163 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 164 mp->mnt_op->vfs_name, mp, l); 165 } 166 167 int 168 adosfs_mountfs(devvp, mp, l) 169 struct vnode *devvp; 170 struct mount *mp; 171 struct lwp *l; 172 { 173 struct disklabel dl; 174 struct partition *parp; 175 struct adosfsmount *amp; 176 struct buf *bp; 177 struct vnode *rvp; 178 int error, part, i; 179 180 part = DISKPART(devvp->v_rdev); 181 amp = NULL; 182 183 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 184 return (error); 185 186 /* 187 * open blkdev and read root block 188 */ 189 if ((error = VOP_OPEN(devvp, FREAD, NOCRED)) != 0) 190 return (error); 191 error = VOP_IOCTL(devvp, DIOCGDINFO, &dl, FREAD, NOCRED); 192 if (error) 193 goto fail; 194 195 parp = &dl.d_partitions[part]; 196 amp = malloc(sizeof(struct adosfsmount), M_ADOSFSMNT, M_WAITOK); 197 memset((char *)amp, 0, (u_long)sizeof(struct adosfsmount)); 198 amp->mp = mp; 199 if (dl.d_type == DTYPE_FLOPPY) { 200 amp->bsize = dl.d_secsize; 201 amp->secsperblk = 1; 202 } 203 else { 204 amp->bsize = parp->p_fsize * parp->p_frag; 205 amp->secsperblk = parp->p_frag; 206 } 207 208 /* invalid fs ? */ 209 if (amp->secsperblk == 0) { 210 error = EINVAL; 211 goto fail; 212 } 213 214 bp = NULL; 215 if ((error = bread(devvp, (daddr_t)BBOFF, 216 amp->bsize, NOCRED, 0, &bp)) != 0) { 217 brelse(bp, 0); 218 goto fail; 219 } 220 amp->dostype = adoswordn(bp, 0); 221 brelse(bp, 0); 222 223 /* basic sanity checks */ 224 if (amp->dostype < 0x444f5300 || amp->dostype > 0x444f5305) { 225 error = EINVAL; 226 goto fail; 227 } 228 229 amp->rootb = (parp->p_size / amp->secsperblk - 1 + parp->p_cpg) >> 1; 230 amp->numblks = parp->p_size / amp->secsperblk - parp->p_cpg; 231 232 amp->nwords = amp->bsize >> 2; 233 amp->dbsize = amp->bsize - (IS_FFS(amp) ? 0 : OFS_DATA_OFFSET); 234 amp->devvp = devvp; 235 236 mp->mnt_data = amp; 237 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)devvp->v_rdev; 238 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_ADOSFS); 239 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 240 mp->mnt_stat.f_namemax = ADMAXNAMELEN; 241 mp->mnt_fs_bshift = ffs(amp->bsize) - 1; 242 mp->mnt_dev_bshift = DEV_BSHIFT; /* XXX */ 243 mp->mnt_flag |= MNT_LOCAL; 244 245 /* 246 * init anode table. 247 */ 248 for (i = 0; i < ANODEHASHSZ; i++) 249 LIST_INIT(&->anodetab[i]); 250 251 /* 252 * get the root anode, if not a valid fs this will fail. 253 */ 254 if ((error = VFS_ROOT(mp, &rvp)) != 0) 255 goto fail; 256 /* allocate and load bitmap, set free space */ 257 amp->bitmap = malloc(((amp->numblks + 31) / 32) * sizeof(*amp->bitmap), 258 M_ADOSFSBITMAP, M_WAITOK); 259 if (amp->bitmap) 260 adosfs_loadbitmap(amp); 261 if (mp->mnt_flag & MNT_RDONLY && amp->bitmap) { 262 /* 263 * Don't need the bitmap any more if it's read-only. 264 */ 265 free(amp->bitmap, M_ADOSFSBITMAP); 266 amp->bitmap = NULL; 267 } 268 vput(rvp); 269 270 return(0); 271 272 fail: 273 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 274 (void) VOP_CLOSE(devvp, FREAD, NOCRED); 275 VOP_UNLOCK(devvp, 0); 276 if (amp && amp->bitmap) 277 free(amp->bitmap, M_ADOSFSBITMAP); 278 if (amp) 279 free(amp, M_ADOSFSMNT); 280 return (error); 281 } 282 283 int 284 adosfs_start(mp, flags) 285 struct mount *mp; 286 int flags; 287 { 288 289 return (0); 290 } 291 292 int 293 adosfs_unmount(mp, mntflags) 294 struct mount *mp; 295 int mntflags; 296 { 297 struct adosfsmount *amp; 298 int error, flags; 299 300 flags = 0; 301 if (mntflags & MNT_FORCE) 302 flags |= FORCECLOSE; 303 if ((error = vflush(mp, NULLVP, flags)) != 0) 304 return (error); 305 amp = VFSTOADOSFS(mp); 306 if (amp->devvp->v_type != VBAD) 307 amp->devvp->v_specmountpoint = NULL; 308 vn_lock(amp->devvp, LK_EXCLUSIVE | LK_RETRY); 309 error = VOP_CLOSE(amp->devvp, FREAD, NOCRED); 310 vput(amp->devvp); 311 if (amp->bitmap) 312 free(amp->bitmap, M_ADOSFSBITMAP); 313 free(amp, M_ADOSFSMNT); 314 mp->mnt_data = NULL; 315 mp->mnt_flag &= ~MNT_LOCAL; 316 return (error); 317 } 318 319 int 320 adosfs_root(mp, vpp) 321 struct mount *mp; 322 struct vnode **vpp; 323 { 324 struct vnode *nvp; 325 int error; 326 327 if ((error = VFS_VGET(mp, (ino_t)VFSTOADOSFS(mp)->rootb, &nvp)) != 0) 328 return (error); 329 /* XXX verify it's a root block? */ 330 *vpp = nvp; 331 return (0); 332 } 333 334 int 335 adosfs_statvfs(mp, sbp) 336 struct mount *mp; 337 struct statvfs *sbp; 338 { 339 struct adosfsmount *amp; 340 341 amp = VFSTOADOSFS(mp); 342 sbp->f_bsize = amp->bsize; 343 sbp->f_frsize = amp->bsize; 344 sbp->f_iosize = amp->dbsize; 345 sbp->f_blocks = amp->numblks; 346 sbp->f_bfree = amp->freeblks; 347 sbp->f_bavail = amp->freeblks; 348 sbp->f_bresvd = 0; 349 sbp->f_files = 0; /* who knows */ 350 sbp->f_ffree = 0; /* " " */ 351 sbp->f_favail = 0; /* " " */ 352 sbp->f_fresvd = 0; 353 copy_statvfs_info(sbp, mp); 354 return (0); 355 } 356 357 /* 358 * lookup an anode, check mount's hash table if not found, create 359 * return locked and referenced al la vget(vp, 1); 360 */ 361 int 362 adosfs_vget(mp, an, vpp) 363 struct mount *mp; 364 ino_t an; 365 struct vnode **vpp; 366 { 367 struct adosfsmount *amp; 368 struct vnode *vp; 369 struct anode *ap; 370 struct buf *bp; 371 char *nam, *tmp; 372 int namlen, error; 373 374 error = 0; 375 amp = VFSTOADOSFS(mp); 376 bp = NULL; 377 378 /* 379 * check hash table. we are done if found 380 */ 381 if ((*vpp = adosfs_ahashget(mp, an)) != NULL) 382 return (0); 383 384 error = getnewvnode(VT_ADOSFS, mp, adosfs_vnodeop_p, &vp); 385 if (error) 386 return (error); 387 388 /* 389 * setup, insert in hash, and lock before io. 390 */ 391 vp->v_data = ap = pool_get(&adosfs_node_pool, PR_WAITOK); 392 memset(ap, 0, sizeof(struct anode)); 393 ap->vp = vp; 394 ap->amp = amp; 395 ap->block = an; 396 ap->nwords = amp->nwords; 397 genfs_node_init(vp, &adosfs_genfsops); 398 adosfs_ainshash(amp, ap); 399 400 if ((error = bread(amp->devvp, an * amp->bsize / DEV_BSIZE, 401 amp->bsize, NOCRED, 0, &bp)) != 0) { 402 brelse(bp, 0); 403 vput(vp); 404 return (error); 405 } 406 407 /* 408 * get type and fill rest in based on that. 409 */ 410 switch (ap->type = adosfs_getblktype(amp, bp)) { 411 case AROOT: 412 vp->v_type = VDIR; 413 vp->v_vflag |= VV_ROOT; 414 ap->mtimev.days = adoswordn(bp, ap->nwords - 10); 415 ap->mtimev.mins = adoswordn(bp, ap->nwords - 9); 416 ap->mtimev.ticks = adoswordn(bp, ap->nwords - 8); 417 ap->created.days = adoswordn(bp, ap->nwords - 7); 418 ap->created.mins = adoswordn(bp, ap->nwords - 6); 419 ap->created.ticks = adoswordn(bp, ap->nwords - 5); 420 break; 421 case ALDIR: 422 case ADIR: 423 vp->v_type = VDIR; 424 break; 425 case ALFILE: 426 case AFILE: 427 vp->v_type = VREG; 428 ap->fsize = adoswordn(bp, ap->nwords - 47); 429 break; 430 case ASLINK: /* XXX soft link */ 431 vp->v_type = VLNK; 432 /* 433 * convert from BCPL string and 434 * from: "part:dir/file" to: "/part/dir/file" 435 */ 436 nam = (char *)bp->b_data + (6 * sizeof(long)); 437 namlen = strlen(nam); 438 tmp = nam; 439 while (*tmp && *tmp != ':') 440 tmp++; 441 if (*tmp == 0) { 442 ap->slinkto = malloc(namlen + 1, M_ANODE, M_WAITOK); 443 memcpy(ap->slinkto, nam, namlen); 444 } else if (*nam == ':') { 445 ap->slinkto = malloc(namlen + 1, M_ANODE, M_WAITOK); 446 memcpy(ap->slinkto, nam, namlen); 447 ap->slinkto[0] = '/'; 448 } else { 449 ap->slinkto = malloc(namlen + 2, M_ANODE, M_WAITOK); 450 ap->slinkto[0] = '/'; 451 memcpy(&ap->slinkto[1], nam, namlen); 452 ap->slinkto[tmp - nam + 1] = '/'; 453 namlen++; 454 } 455 ap->slinkto[namlen] = 0; 456 ap->fsize = namlen; 457 break; 458 default: 459 brelse(bp, 0); 460 vput(vp); 461 return (EINVAL); 462 } 463 464 /* 465 * Get appropriate data from this block; hard link needs 466 * to get other data from the "real" block. 467 */ 468 469 /* 470 * copy in name (from original block) 471 */ 472 nam = (char *)bp->b_data + (ap->nwords - 20) * sizeof(u_int32_t); 473 namlen = *(u_char *)nam++; 474 if (namlen > 30) { 475 #ifdef DIAGNOSTIC 476 printf("adosfs: aget: name length too long blk %llu\n", 477 (unsigned long long)an); 478 #endif 479 brelse(bp, 0); 480 vput(vp); 481 return (EINVAL); 482 } 483 memcpy(ap->name, nam, namlen); 484 ap->name[namlen] = 0; 485 486 /* 487 * if dir alloc hash table and copy it in 488 */ 489 if (vp->v_type == VDIR) { 490 int i; 491 492 ap->tab = malloc(ANODETABSZ(ap) * 2, M_ANODE, M_WAITOK); 493 ap->ntabent = ANODETABENT(ap); 494 ap->tabi = (int *)&ap->tab[ap->ntabent]; 495 memset(ap->tabi, 0, ANODETABSZ(ap)); 496 for (i = 0; i < ap->ntabent; i++) 497 ap->tab[i] = adoswordn(bp, i + 6); 498 } 499 500 /* 501 * misc. 502 */ 503 ap->pblock = adoswordn(bp, ap->nwords - 3); 504 ap->hashf = adoswordn(bp, ap->nwords - 4); 505 ap->linknext = adoswordn(bp, ap->nwords - 10); 506 ap->linkto = adoswordn(bp, ap->nwords - 11); 507 508 /* 509 * setup last indirect block cache. 510 */ 511 ap->lastlindblk = 0; 512 if (ap->type == AFILE) { 513 ap->lastindblk = ap->block; 514 if (adoswordn(bp, ap->nwords - 10)) 515 ap->linkto = ap->block; 516 } else if (ap->type == ALFILE) { 517 ap->lastindblk = ap->linkto; 518 brelse(bp, 0); 519 bp = NULL; 520 error = bread(amp->devvp, ap->linkto * amp->bsize / DEV_BSIZE, 521 amp->bsize, NOCRED, 0, &bp); 522 if (error) { 523 brelse(bp, 0); 524 vput(vp); 525 return (error); 526 } 527 ap->fsize = adoswordn(bp, ap->nwords - 47); 528 /* 529 * Should ap->block be set to the real file header block? 530 */ 531 ap->block = ap->linkto; 532 } 533 534 if (ap->type == AROOT) { 535 ap->adprot = 15; 536 ap->uid = amp->uid; 537 ap->gid = amp->gid; 538 } else { 539 ap->adprot = adoswordn(bp, ap->nwords - 48) ^ 15; 540 /* 541 * ADOS directories do not have a `x' protection bit as 542 * it is known in VFS; this functionality is fulfilled 543 * by the ADOS `r' bit. 544 * 545 * To retain the ADOS behaviour, fake execute permissions 546 * in that case. 547 */ 548 if ((ap->type == ADIR || ap->type == ALDIR) && 549 (ap->adprot & 0x00000008) == 0) 550 ap->adprot &= ~0x00000002; 551 552 /* 553 * Get uid/gid from extensions in file header 554 * (really need to know if this is a muFS partition) 555 */ 556 ap->uid = (adoswordn(bp, ap->nwords - 49) >> 16) & 0xffff; 557 ap->gid = adoswordn(bp, ap->nwords - 49) & 0xffff; 558 if (ap->uid || ap->gid) { 559 if (ap->uid == 0xffff) 560 ap->uid = 0; 561 if (ap->gid == 0xffff) 562 ap->gid = 0; 563 ap->adprot |= 0x40000000; /* Kludge */ 564 } 565 else { 566 /* 567 * uid & gid extension don't exist, 568 * so use the mount-point uid/gid 569 */ 570 ap->uid = amp->uid; 571 ap->gid = amp->gid; 572 } 573 } 574 ap->mtime.days = adoswordn(bp, ap->nwords - 23); 575 ap->mtime.mins = adoswordn(bp, ap->nwords - 22); 576 ap->mtime.ticks = adoswordn(bp, ap->nwords - 21); 577 578 *vpp = vp; 579 brelse(bp, 0); 580 uvm_vnp_setsize(vp, ap->fsize); 581 return (0); 582 } 583 584 /* 585 * Load the bitmap into memory, and count the number of available 586 * blocks. 587 * The bitmap will be released if the filesystem is read-only; it's 588 * only needed to find the free space. 589 */ 590 int 591 adosfs_loadbitmap(amp) 592 struct adosfsmount *amp; 593 { 594 struct buf *bp, *mapbp; 595 u_long bn; 596 int blkix, endix, mapix; 597 int bmsize; 598 int error; 599 600 bp = mapbp = NULL; 601 bn = amp->rootb; 602 if ((error = bread(amp->devvp, bn * amp->bsize / DEV_BSIZE, amp->bsize, 603 NOCRED, 0, &bp)) != 0) { 604 brelse(bp, 0); 605 return (error); 606 } 607 blkix = amp->nwords - 49; 608 endix = amp->nwords - 24; 609 mapix = 0; 610 bmsize = (amp->numblks + 31) / 32; 611 while (mapix < bmsize) { 612 int n; 613 u_long bits; 614 615 if (adoswordn(bp, blkix) == 0) 616 break; 617 if (mapbp != NULL) 618 brelse(mapbp, 0); 619 if ((error = bread(amp->devvp, 620 adoswordn(bp, blkix) * amp->bsize / DEV_BSIZE, amp->bsize, 621 NOCRED, 0, &mapbp)) != 0) 622 break; 623 if (adoscksum(mapbp, amp->nwords)) { 624 #ifdef DIAGNOSTIC 625 printf("adosfs: loadbitmap - cksum of blk %d failed\n", 626 adoswordn(bp, blkix)); 627 #endif 628 /* XXX Force read-only? Set free space 0? */ 629 break; 630 } 631 n = 1; 632 while (n < amp->nwords && mapix < bmsize) { 633 amp->bitmap[mapix++] = bits = adoswordn(mapbp, n); 634 ++n; 635 if (mapix == bmsize && amp->numblks & 31) 636 bits &= ~(0xffffffff << (amp->numblks & 31)); 637 while (bits) { 638 if (bits & 1) 639 ++amp->freeblks; 640 bits >>= 1; 641 } 642 } 643 ++blkix; 644 if (mapix < bmsize && blkix == endix) { 645 bn = adoswordn(bp, blkix); 646 brelse(bp, 0); 647 if ((error = bread(amp->devvp, bn * amp->bsize / DEV_BSIZE, 648 amp->bsize, NOCRED, 0, &bp)) != 0) 649 break; 650 /* 651 * Why is there no checksum on these blocks? 652 */ 653 blkix = 0; 654 endix = amp->nwords - 1; 655 } 656 } 657 if (bp) 658 brelse(bp, 0); 659 if (mapbp) 660 brelse(mapbp, 0); 661 return (error); 662 } 663 664 665 /* 666 * File handle to vnode 667 * 668 * Have to be really careful about stale file handles: 669 * - check that the inode number is in range 670 * - call iget() to get the locked inode 671 * - check for an unallocated inode (i_mode == 0) 672 * - check that the generation number matches 673 */ 674 675 struct ifid { 676 ushort ifid_len; 677 ushort ifid_pad; 678 int ifid_ino; 679 long ifid_start; 680 }; 681 682 int 683 adosfs_fhtovp(mp, fhp, vpp) 684 struct mount *mp; 685 struct fid *fhp; 686 struct vnode **vpp; 687 { 688 struct ifid ifh; 689 #if 0 690 struct anode *ap; 691 #endif 692 struct vnode *nvp; 693 int error; 694 695 if (fhp->fid_len != sizeof(struct ifid)) 696 return EINVAL; 697 698 #ifdef ADOSFS_DIAGNOSTIC 699 printf("adfhtovp(%x, %x, %x)\n", mp, fhp, vpp); 700 #endif 701 702 memcpy(&ifh, fhp, sizeof(ifh)); 703 704 if ((error = VFS_VGET(mp, ifh.ifid_ino, &nvp)) != 0) { 705 *vpp = NULLVP; 706 return (error); 707 } 708 #if 0 709 ap = VTOA(nvp); 710 if (ap->inode.iso_mode == 0) { 711 vput(nvp); 712 *vpp = NULLVP; 713 return (ESTALE); 714 } 715 #endif 716 *vpp = nvp; 717 return(0); 718 } 719 720 int 721 adosfs_vptofh(vp, fhp, fh_size) 722 struct vnode *vp; 723 struct fid *fhp; 724 size_t *fh_size; 725 { 726 struct anode *ap = VTOA(vp); 727 struct ifid ifh; 728 729 if (*fh_size < sizeof(struct ifid)) { 730 *fh_size = sizeof(struct ifid); 731 return E2BIG; 732 } 733 *fh_size = sizeof(struct ifid); 734 735 memset(&ifh, 0, sizeof(ifh)); 736 ifh.ifid_len = sizeof(struct ifid); 737 ifh.ifid_ino = ap->block; 738 ifh.ifid_start = ap->block; 739 memcpy(fhp, &ifh, sizeof(ifh)); 740 741 #ifdef ADOSFS_DIAGNOSTIC 742 printf("advptofh(%x, %x)\n", vp, fhp); 743 #endif 744 return(0); 745 } 746 747 int 748 adosfs_sync(mp, waitfor, uc) 749 struct mount *mp; 750 int waitfor; 751 kauth_cred_t uc; 752 { 753 #ifdef ADOSFS_DIAGNOSTIC 754 printf("ad_sync(%x, %x)\n", mp, waitfor); 755 #endif 756 return(0); 757 } 758 759 void 760 adosfs_init() 761 { 762 763 malloc_type_attach(M_ADOSFSMNT); 764 malloc_type_attach(M_ANODE); 765 malloc_type_attach(M_ADOSFSBITMAP); 766 pool_init(&adosfs_node_pool, sizeof(struct anode), 0, 0, 0, "adosndpl", 767 &pool_allocator_nointr, IPL_NONE); 768 simple_lock_init(&adosfs_hashlock); 769 } 770 771 void 772 adosfs_done() 773 { 774 775 pool_destroy(&adosfs_node_pool); 776 malloc_type_detach(M_ADOSFSBITMAP); 777 malloc_type_detach(M_ANODE); 778 malloc_type_detach(M_ADOSFSMNT); 779 } 780 781 SYSCTL_SETUP(sysctl_vfs_adosfs_setup, "sysctl vfs.adosfs subtree setup") 782 { 783 784 sysctl_createv(clog, 0, NULL, NULL, 785 CTLFLAG_PERMANENT, 786 CTLTYPE_NODE, "vfs", NULL, 787 NULL, 0, NULL, 0, 788 CTL_VFS, CTL_EOL); 789 sysctl_createv(clog, 0, NULL, NULL, 790 CTLFLAG_PERMANENT, 791 CTLTYPE_NODE, "adosfs", 792 SYSCTL_DESCR("AmigaDOS file system"), 793 NULL, 0, NULL, 0, 794 CTL_VFS, 16, CTL_EOL); 795 /* 796 * XXX the "16" above could be dynamic, thereby eliminating 797 * one more instance of the "number to vfs" mapping problem, 798 * but "16" is the order as taken from sys/mount.h 799 */ 800 } 801 802 /* 803 * vfs generic function call table 804 */ 805 806 extern const struct vnodeopv_desc adosfs_vnodeop_opv_desc; 807 808 const struct vnodeopv_desc *adosfs_vnodeopv_descs[] = { 809 &adosfs_vnodeop_opv_desc, 810 NULL, 811 }; 812 813 struct vfsops adosfs_vfsops = { 814 MOUNT_ADOSFS, 815 sizeof (struct adosfs_args), 816 adosfs_mount, 817 adosfs_start, 818 adosfs_unmount, 819 adosfs_root, 820 (void *)eopnotsupp, /* vfs_quotactl */ 821 adosfs_statvfs, 822 adosfs_sync, 823 adosfs_vget, 824 adosfs_fhtovp, 825 adosfs_vptofh, 826 adosfs_init, 827 NULL, 828 adosfs_done, 829 NULL, /* vfs_mountroot */ 830 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 831 vfs_stdextattrctl, 832 (void *)eopnotsupp, /* vfs_suspendctl */ 833 genfs_renamelock_enter, 834 genfs_renamelock_exit, 835 (void *)eopnotsupp, 836 adosfs_vnodeopv_descs, 837 0, 838 { NULL, NULL }, 839 }; 840 841 static int 842 adosfs_modcmd(modcmd_t cmd, void *arg) 843 { 844 845 switch (cmd) { 846 case MODULE_CMD_INIT: 847 return vfs_attach(&adosfs_vfsops); 848 case MODULE_CMD_FINI: 849 return vfs_detach(&adosfs_vfsops); 850 default: 851 return ENOTTY; 852 } 853 } 854
Indexes created Tue Sep 23 20:09:58 GMT 2025