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