1 /*- 2 * Copyright (c) 1998, 1999 Semen Ustimenko (semenu@FreeBSD.org) 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: src/sys/fs/hpfs/hpfs_vfsops.c,v 1.3.2.2 2001/12/25 01:44:45 dillon Exp $ 27 * $DragonFly: src/sys/vfs/hpfs/hpfs_vfsops.c,v 1.29 2005/08/02 13:03:55 joerg Exp $ 28 */ 29 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/nlookup.h> 34 #include <sys/conf.h> 35 #include <sys/proc.h> 36 #include <sys/kernel.h> 37 #include <sys/vnode.h> 38 #include <sys/mount.h> 39 #include <sys/buf.h> 40 #include <sys/fcntl.h> 41 #include <sys/malloc.h> 42 43 #include <machine/inttypes.h> 44 45 #include <vm/vm.h> 46 #include <vm/vm_param.h> 47 #if defined(__NetBSD__) 48 #include <vm/vm_prot.h> 49 #endif 50 #include <vm/vm_page.h> 51 #include <vm/vm_object.h> 52 #include <vm/vm_extern.h> 53 #include <sys/buf2.h> 54 55 #if defined(__NetBSD__) 56 #include <miscfs/specfs/specdev.h> 57 #endif 58 59 #include "hpfs.h" 60 #include "hpfsmount.h" 61 #include "hpfs_subr.h" 62 63 extern struct vnodeopv_entry_desc hpfs_vnodeop_entries[]; 64 65 MALLOC_DEFINE(M_HPFSMNT, "HPFS mount", "HPFS mount structure"); 66 MALLOC_DEFINE(M_HPFSNO, "HPFS node", "HPFS node structure"); 67 68 static int hpfs_root (struct mount *, struct vnode **); 69 static int hpfs_statfs (struct mount *, struct statfs *, 70 struct thread *); 71 static int hpfs_unmount (struct mount *, int, struct thread *); 72 static int hpfs_vget (struct mount *mp, ino_t ino, 73 struct vnode **vpp); 74 static int hpfs_mountfs (struct vnode *, struct mount *, 75 struct hpfs_args *, struct thread *); 76 static int hpfs_vptofh (struct vnode *, struct fid *); 77 static int hpfs_fhtovp (struct mount *, struct fid *, 78 struct vnode **); 79 80 81 struct sockaddr; 82 static int hpfs_mount (struct mount *, char *, caddr_t, struct thread *); 83 static int hpfs_init (struct vfsconf *); 84 static int hpfs_checkexp (struct mount *, struct sockaddr *, 85 int *, struct ucred **); 86 87 /*ARGSUSED*/ 88 static int 89 hpfs_checkexp(struct mount *mp, 90 struct sockaddr *nam, 91 int *exflagsp, struct ucred **credanonp) 92 { 93 struct netcred *np; 94 struct hpfsmount *hpm = VFSTOHPFS(mp); 95 96 /* 97 * Get the export permission structure for this <mp, client> tuple. 98 */ 99 np = vfs_export_lookup(mp, &hpm->hpm_export, nam); 100 if (np == NULL) 101 return (EACCES); 102 103 *exflagsp = np->netc_exflags; 104 *credanonp = &np->netc_anon; 105 return (0); 106 } 107 108 static int 109 hpfs_init(struct vfsconf *vcp) 110 { 111 dprintf(("hpfs_init():\n")); 112 113 hpfs_hphashinit(); 114 return 0; 115 } 116 117 static int 118 hpfs_mount(struct mount *mp, 119 char *path, caddr_t data, 120 struct thread *td) 121 { 122 u_int size; 123 int error; 124 struct vnode *devvp; 125 struct hpfs_args args; 126 struct hpfsmount *hpmp = 0; 127 struct nlookupdata nd; 128 129 dprintf(("hpfs_mount():\n")); 130 /* 131 *** 132 * Mounting non-root file system or updating a file system 133 *** 134 */ 135 136 /* copy in user arguments*/ 137 error = copyin(data, (caddr_t)&args, sizeof (struct hpfs_args)); 138 if (error) 139 goto error_1; /* can't get arguments*/ 140 141 /* 142 * If updating, check whether changing from read-only to 143 * read/write; if there is no device name, that's all we do. 144 */ 145 if (mp->mnt_flag & MNT_UPDATE) { 146 dprintf(("hpfs_mount: MNT_UPDATE: ")); 147 148 hpmp = VFSTOHPFS(mp); 149 150 if (args.fspec == 0) { 151 dprintf(("export 0x%x\n",args.export.ex_flags)); 152 error = vfs_export(mp, &hpmp->hpm_export, &args.export); 153 if (error) { 154 printf("hpfs_mount: vfs_export failed %d\n", 155 error); 156 } 157 goto success; 158 } else { 159 dprintf(("name [FAILED]\n")); 160 error = EINVAL; 161 goto success; 162 } 163 dprintf(("\n")); 164 } 165 166 /* 167 * Not an update, or updating the name: look up the name 168 * and verify that it refers to a sensible block device. 169 */ 170 devvp = NULL; 171 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW); 172 if (error == 0) 173 error = nlookup(&nd); 174 if (error == 0) 175 error = cache_vref(nd.nl_ncp, nd.nl_cred, &devvp); 176 nlookup_done(&nd); 177 if (error) 178 goto error_1; 179 180 if (!vn_isdisk(devvp, &error)) 181 goto error_2; 182 183 /* 184 ******************** 185 * NEW MOUNT 186 ******************** 187 */ 188 189 /* Save "mounted from" info for mount point (NULL pad)*/ 190 copyinstr( args.fspec, /* device name*/ 191 mp->mnt_stat.f_mntfromname, /* save area*/ 192 MNAMELEN - 1, /* max size*/ 193 &size); /* real size*/ 194 bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 195 196 error = hpfs_mountfs(devvp, mp, &args, td); 197 if (error) 198 goto error_2; 199 200 /* 201 * Initialize FS stat information in mount struct; uses 202 * mp->mnt_stat.f_mntfromname. 203 * 204 * This code is common to root and non-root mounts 205 */ 206 VFS_STATFS(mp, &mp->mnt_stat, td); 207 return (error); 208 209 error_2: /* error with devvp held*/ 210 211 /* release devvp before failing*/ 212 vrele(devvp); 213 214 error_1: /* no state to back out*/ 215 216 success: 217 return (error); 218 } 219 220 /* 221 * Common code for mount and mountroot 222 */ 223 int 224 hpfs_mountfs(struct vnode *devvp, struct mount *mp, struct hpfs_args *argsp, 225 struct thread *td) 226 { 227 int error, ncount, ronly; 228 struct sublock *sup; 229 struct spblock *spp; 230 struct hpfsmount *hpmp; 231 struct buf *bp = NULL; 232 struct vnode *vp; 233 dev_t dev; 234 235 dprintf(("hpfs_mountfs():\n")); 236 /* 237 * Disallow multiple mounts of the same device. 238 * Disallow mounting of a device that is currently in use 239 * (except for root, which might share swap device for miniroot). 240 * Flush out any old buffers remaining from a previous use. 241 */ 242 error = vfs_mountedon(devvp); 243 if (error) 244 return (error); 245 ncount = count_udev(devvp->v_udev); 246 if (devvp->v_object) 247 ncount -= 1; 248 if (ncount > 0) 249 return (EBUSY); 250 251 VN_LOCK(devvp, LK_EXCLUSIVE | LK_RETRY, td); 252 error = vinvalbuf(devvp, V_SAVE, td, 0, 0); 253 VOP__UNLOCK(devvp, 0, td); 254 if (error) 255 return (error); 256 257 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 258 VN_LOCK(devvp, LK_EXCLUSIVE | LK_RETRY, td); 259 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL, td); 260 VOP__UNLOCK(devvp, 0, td); 261 if (error) 262 return (error); 263 dev = devvp->v_rdev; 264 265 /* 266 * Do actual mount 267 */ 268 hpmp = malloc(sizeof(struct hpfsmount), M_HPFSMNT, M_WAITOK); 269 bzero(hpmp, sizeof(struct hpfsmount)); 270 271 /* Read in SuperBlock */ 272 error = bread(devvp, SUBLOCK, SUSIZE, &bp); 273 if (error) 274 goto failed; 275 bcopy(bp->b_data, &hpmp->hpm_su, sizeof(struct sublock)); 276 brelse(bp); bp = NULL; 277 278 /* Read in SpareBlock */ 279 error = bread(devvp, SPBLOCK, SPSIZE, &bp); 280 if (error) 281 goto failed; 282 bcopy(bp->b_data, &hpmp->hpm_sp, sizeof(struct spblock)); 283 brelse(bp); bp = NULL; 284 285 sup = &hpmp->hpm_su; 286 spp = &hpmp->hpm_sp; 287 288 /* Check magic */ 289 if (sup->su_magic != SU_MAGIC) { 290 printf("hpfs_mountfs: SuperBlock MAGIC DOESN'T MATCH\n"); 291 error = EINVAL; 292 goto failed; 293 } 294 if (spp->sp_magic != SP_MAGIC) { 295 printf("hpfs_mountfs: SpareBlock MAGIC DOESN'T MATCH\n"); 296 error = EINVAL; 297 goto failed; 298 } 299 300 mp->mnt_data = (qaddr_t)hpmp; 301 hpmp->hpm_devvp = devvp; 302 hpmp->hpm_dev = dev; 303 hpmp->hpm_mp = mp; 304 hpmp->hpm_uid = argsp->uid; 305 hpmp->hpm_gid = argsp->gid; 306 hpmp->hpm_mode = argsp->mode; 307 308 error = hpfs_bminit(hpmp); 309 if (error) 310 goto failed; 311 312 error = hpfs_cpinit(hpmp, argsp); 313 if (error) { 314 hpfs_bmdeinit(hpmp); 315 goto failed; 316 } 317 vfs_add_vnodeops(mp, &mp->mnt_vn_norm_ops, hpfs_vnodeop_entries); 318 319 error = hpfs_root(mp, &vp); 320 if (error) { 321 hpfs_cpdeinit(hpmp); 322 hpfs_bmdeinit(hpmp); 323 goto failed; 324 } 325 326 vput(vp); 327 328 mp->mnt_stat.f_fsid.val[0] = (long)dev2udev(dev); 329 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 330 mp->mnt_maxsymlinklen = 0; 331 mp->mnt_flag |= MNT_LOCAL; 332 dev->si_mountpoint = mp; 333 return (0); 334 335 failed: 336 if (bp) 337 brelse (bp); 338 mp->mnt_data = (qaddr_t)NULL; 339 dev->si_mountpoint = NULL; 340 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, td); 341 return (error); 342 } 343 344 345 static int 346 hpfs_unmount(struct mount *mp, int mntflags, struct thread *td) 347 { 348 int error, flags, ronly; 349 struct hpfsmount *hpmp = VFSTOHPFS(mp); 350 351 dprintf(("hpfs_unmount():\n")); 352 353 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 354 355 flags = 0; 356 if(mntflags & MNT_FORCE) 357 flags |= FORCECLOSE; 358 359 dprintf(("hpfs_unmount: vflushing...\n")); 360 361 error = vflush(mp, 0, flags); 362 if (error) { 363 printf("hpfs_unmount: vflush failed: %d\n",error); 364 return (error); 365 } 366 367 hpmp->hpm_devvp->v_rdev->si_mountpoint = NULL; 368 369 vinvalbuf(hpmp->hpm_devvp, V_SAVE, td, 0, 0); 370 error = VOP_CLOSE(hpmp->hpm_devvp, ronly ? FREAD : FREAD|FWRITE, td); 371 372 vrele(hpmp->hpm_devvp); 373 374 dprintf(("hpfs_umount: freeing memory...\n")); 375 hpfs_cpdeinit(hpmp); 376 hpfs_bmdeinit(hpmp); 377 mp->mnt_data = (qaddr_t)0; 378 mp->mnt_flag &= ~MNT_LOCAL; 379 FREE(hpmp, M_HPFSMNT); 380 381 return (0); 382 } 383 384 static int 385 hpfs_root(struct mount *mp, struct vnode **vpp) 386 { 387 int error = 0; 388 struct hpfsmount *hpmp = VFSTOHPFS(mp); 389 390 dprintf(("hpfs_root():\n")); 391 error = VFS_VGET(mp, (ino_t)hpmp->hpm_su.su_rootfno, vpp); 392 if(error) { 393 printf("hpfs_root: VFS_VGET failed: %d\n",error); 394 return (error); 395 } 396 397 return (error); 398 } 399 400 static int 401 hpfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 402 { 403 struct hpfsmount *hpmp = VFSTOHPFS(mp); 404 405 dprintf(("hpfs_statfs(): HPFS%d.%d\n", 406 hpmp->hpm_su.su_hpfsver, hpmp->hpm_su.su_fnctver)); 407 408 sbp->f_type = mp->mnt_vfc->vfc_typenum; 409 sbp->f_bsize = DEV_BSIZE; 410 sbp->f_iosize = DEV_BSIZE; 411 sbp->f_blocks = hpmp->hpm_su.su_btotal; 412 sbp->f_bfree = sbp->f_bavail = hpmp->hpm_bavail; 413 sbp->f_ffree = 0; 414 sbp->f_files = 0; 415 if (sbp != &mp->mnt_stat) { 416 bcopy((caddr_t)mp->mnt_stat.f_mntfromname, 417 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN); 418 } 419 sbp->f_flags = mp->mnt_flag; 420 421 return (0); 422 } 423 424 425 /*ARGSUSED*/ 426 static int 427 hpfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 428 { 429 struct vnode *nvp; 430 struct hpfid *hpfhp = (struct hpfid *)fhp; 431 int error; 432 433 if ((error = VFS_VGET(mp, hpfhp->hpfid_ino, &nvp)) != 0) { 434 *vpp = NULLVP; 435 return (error); 436 } 437 /* XXX as unlink/rmdir/mkdir/creat are not currently possible 438 * with HPFS, we don't need to check anything else for now */ 439 *vpp = nvp; 440 441 return (0); 442 } 443 444 static int 445 hpfs_vptofh(struct vnode *vp, struct fid *fhp) 446 { 447 struct hpfsnode *hpp; 448 struct hpfid *hpfhp; 449 450 hpp = VTOHP(vp); 451 hpfhp = (struct hpfid *)fhp; 452 hpfhp->hpfid_len = sizeof(struct hpfid); 453 hpfhp->hpfid_ino = hpp->h_no; 454 /* hpfhp->hpfid_gen = hpp->h_gen; */ 455 return (0); 456 } 457 458 static int 459 hpfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 460 { 461 struct hpfsmount *hpmp = VFSTOHPFS(mp); 462 struct vnode *vp; 463 struct hpfsnode *hp; 464 struct buf *bp; 465 struct thread *td = curthread; /* XXX */ 466 int error; 467 468 dprintf(("hpfs_vget(0x%x): ",ino)); 469 470 *vpp = NULL; 471 hp = NULL; 472 vp = NULL; 473 474 if ((*vpp = hpfs_hphashvget(hpmp->hpm_dev, ino, td)) != NULL) { 475 dprintf(("hashed\n")); 476 return (0); 477 } 478 479 /* 480 * We have to lock node creation for a while, 481 * but then we have to call getnewvnode(), 482 * this may cause hpfs_reclaim() to be called, 483 * this may need to VOP_VGET() parent dir for 484 * update reasons, and if parent is not in 485 * hash, we have to lock node creation... 486 * To solve this, we MALLOC, getnewvnode and init while 487 * not locked (probability of node appearence 488 * at that time is little, and anyway - we'll 489 * check for it). 490 */ 491 MALLOC(hp, struct hpfsnode *, sizeof(struct hpfsnode), 492 M_HPFSNO, M_WAITOK); 493 494 error = getnewvnode(VT_HPFS, hpmp->hpm_mp, &vp, VLKTIMEOUT, 0); 495 if (error) { 496 printf("hpfs_vget: can't get new vnode\n"); 497 FREE(hp, M_HPFSNO); 498 return (error); 499 } 500 501 dprintf(("prenew ")); 502 503 vp->v_data = hp; 504 505 if (ino == (ino_t)hpmp->hpm_su.su_rootfno) 506 vp->v_flag |= VROOT; 507 508 lwkt_token_init(&hp->h_interlock); 509 510 hp->h_flag = H_INVAL; 511 hp->h_vp = vp; 512 hp->h_hpmp = hpmp; 513 hp->h_no = ino; 514 hp->h_dev = hpmp->hpm_dev; 515 hp->h_uid = hpmp->hpm_uid; 516 hp->h_gid = hpmp->hpm_uid; 517 hp->h_mode = hpmp->hpm_mode; 518 hp->h_devvp = hpmp->hpm_devvp; 519 vref(hp->h_devvp); 520 521 do { 522 if ((*vpp = hpfs_hphashvget(hpmp->hpm_dev, ino, td)) != NULL) { 523 dprintf(("hashed2\n")); 524 vx_put(vp); 525 return (0); 526 } 527 } while(LOCKMGR(&hpfs_hphash_lock,LK_EXCLUSIVE|LK_SLEEPFAIL,NULL,NULL)); 528 529 hpfs_hphashins(hp); 530 531 LOCKMGR(&hpfs_hphash_lock, LK_RELEASE, NULL, NULL); 532 533 error = bread(hpmp->hpm_devvp, ino, FNODESIZE, &bp); 534 if (error) { 535 printf("hpfs_vget: can't read ino %"PRId64"\n",ino); 536 vx_put(vp); 537 return (error); 538 } 539 bcopy(bp->b_data, &hp->h_fn, sizeof(struct fnode)); 540 brelse(bp); 541 542 if (hp->h_fn.fn_magic != FN_MAGIC) { 543 printf("hpfs_vget: MAGIC DOESN'T MATCH\n"); 544 vx_put(vp); 545 return (EINVAL); 546 } 547 548 vp->v_type = hp->h_fn.fn_flag ? VDIR:VREG; 549 hp->h_flag &= ~H_INVAL; 550 551 /* Return the locked and refd vnode */ 552 *vpp = vp; 553 554 return (0); 555 } 556 557 static struct vfsops hpfs_vfsops = { 558 .vfs_mount = hpfs_mount, 559 .vfs_unmount = hpfs_unmount, 560 .vfs_root = hpfs_root, 561 .vfs_statfs = hpfs_statfs, 562 .vfs_sync = vfs_stdsync, 563 .vfs_vget = hpfs_vget, 564 .vfs_fhtovp = hpfs_fhtovp, 565 .vfs_checkexp = hpfs_checkexp, 566 .vfs_vptofh = hpfs_vptofh, 567 .vfs_init = hpfs_init, 568 .vfs_uninit = hpfs_hphash_uninit 569 }; 570 571 VFS_SET(hpfs_vfsops, hpfs, 0); 572 573