1 /* $OpenBSD: vfs_subr.c,v 1.260 2017/07/31 16:47:03 florian Exp $ */ 2 /* $NetBSD: vfs_subr.c,v 1.53 1996/04/22 01:39:13 christos Exp $ */ 3 4 /* 5 * Copyright (c) 1989, 1993 6 * The Regents of the University of California. All rights reserved. 7 * (c) UNIX System Laboratories, Inc. 8 * All or some portions of this file are derived from material licensed 9 * to the University of California by American Telephone and Telegraph 10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 11 * the permission of UNIX System Laboratories, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)vfs_subr.c 8.13 (Berkeley) 4/18/94 38 */ 39 40 /* 41 * External virtual filesystem routines 42 */ 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/proc.h> 47 #include <sys/sysctl.h> 48 #include <sys/mount.h> 49 #include <sys/time.h> 50 #include <sys/fcntl.h> 51 #include <sys/kernel.h> 52 #include <sys/conf.h> 53 #include <sys/vnode.h> 54 #include <sys/lock.h> 55 #include <sys/stat.h> 56 #include <sys/acct.h> 57 #include <sys/namei.h> 58 #include <sys/ucred.h> 59 #include <sys/buf.h> 60 #include <sys/errno.h> 61 #include <sys/malloc.h> 62 #include <sys/mbuf.h> 63 #include <sys/syscallargs.h> 64 #include <sys/pool.h> 65 #include <sys/tree.h> 66 #include <sys/specdev.h> 67 68 #include <netinet/in.h> 69 70 #include <uvm/uvm_extern.h> 71 #include <uvm/uvm_vnode.h> 72 73 #include "softraid.h" 74 75 void sr_shutdown(void); 76 77 enum vtype iftovt_tab[16] = { 78 VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, 79 VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, 80 }; 81 82 int vttoif_tab[9] = { 83 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, 84 S_IFSOCK, S_IFIFO, S_IFMT, 85 }; 86 87 int prtactive = 0; /* 1 => print out reclaim of active vnodes */ 88 int suid_clear = 1; /* 1 => clear SUID / SGID on owner change */ 89 90 /* 91 * Insq/Remq for the vnode usage lists. 92 */ 93 #define bufinsvn(bp, dp) LIST_INSERT_HEAD(dp, bp, b_vnbufs) 94 #define bufremvn(bp) { \ 95 LIST_REMOVE(bp, b_vnbufs); \ 96 LIST_NEXT(bp, b_vnbufs) = NOLIST; \ 97 } 98 99 struct freelst vnode_hold_list; /* list of vnodes referencing buffers */ 100 struct freelst vnode_free_list; /* vnode free list */ 101 102 struct mntlist mountlist; /* mounted filesystem list */ 103 104 void vclean(struct vnode *, int, struct proc *); 105 106 void insmntque(struct vnode *, struct mount *); 107 int getdevvp(dev_t, struct vnode **, enum vtype); 108 109 int vfs_hang_addrlist(struct mount *, struct netexport *, 110 struct export_args *); 111 int vfs_free_netcred(struct radix_node *, void *, u_int); 112 void vfs_free_addrlist(struct netexport *); 113 void vputonfreelist(struct vnode *); 114 115 int vflush_vnode(struct vnode *, void *); 116 int maxvnodes; 117 118 #ifdef DEBUG 119 void printlockedvnodes(void); 120 #endif 121 122 struct pool vnode_pool; 123 struct pool uvm_vnode_pool; 124 125 static inline int rb_buf_compare(const struct buf *b1, const struct buf *b2); 126 RBT_GENERATE(buf_rb_bufs, buf, b_rbbufs, rb_buf_compare); 127 128 static inline int 129 rb_buf_compare(const struct buf *b1, const struct buf *b2) 130 { 131 if (b1->b_lblkno < b2->b_lblkno) 132 return(-1); 133 if (b1->b_lblkno > b2->b_lblkno) 134 return(1); 135 return(0); 136 } 137 138 /* 139 * Initialize the vnode management data structures. 140 */ 141 void 142 vntblinit(void) 143 { 144 /* buffer cache may need a vnode for each buffer */ 145 maxvnodes = 2 * initialvnodes; 146 pool_init(&vnode_pool, sizeof(struct vnode), 0, IPL_NONE, 147 PR_WAITOK, "vnodes", NULL); 148 pool_init(&uvm_vnode_pool, sizeof(struct uvm_vnode), 0, IPL_NONE, 149 PR_WAITOK, "uvmvnodes", NULL); 150 TAILQ_INIT(&vnode_hold_list); 151 TAILQ_INIT(&vnode_free_list); 152 TAILQ_INIT(&mountlist); 153 /* 154 * Initialize the filesystem syncer. 155 */ 156 vn_initialize_syncerd(); 157 158 #ifdef NFSSERVER 159 rn_init(sizeof(struct sockaddr_in)); 160 #endif /* NFSSERVER */ 161 } 162 163 /* 164 * Mark a mount point as busy. Used to synchronize access and to delay 165 * unmounting. 166 * 167 * Default behaviour is to attempt getting a READ lock and in case of an 168 * ongoing unmount, to wait for it to finish and then return failure. 169 */ 170 int 171 vfs_busy(struct mount *mp, int flags) 172 { 173 int rwflags = 0; 174 175 /* new mountpoints need their lock initialised */ 176 if (mp->mnt_lock.rwl_name == NULL) 177 rw_init_flags(&mp->mnt_lock, "vfslock", RWL_IS_VNODE); 178 179 if (flags & VB_WRITE) 180 rwflags |= RW_WRITE; 181 else 182 rwflags |= RW_READ; 183 184 if (flags & VB_WAIT) 185 rwflags |= RW_SLEEPFAIL; 186 else 187 rwflags |= RW_NOSLEEP; 188 189 if (rw_enter(&mp->mnt_lock, rwflags)) 190 return (EBUSY); 191 192 return (0); 193 } 194 195 /* 196 * Free a busy file system 197 */ 198 void 199 vfs_unbusy(struct mount *mp) 200 { 201 rw_exit(&mp->mnt_lock); 202 } 203 204 int 205 vfs_isbusy(struct mount *mp) 206 { 207 if (RWLOCK_OWNER(&mp->mnt_lock) > 0) 208 return (1); 209 else 210 return (0); 211 } 212 213 /* 214 * Lookup a filesystem type, and if found allocate and initialize 215 * a mount structure for it. 216 * 217 * Devname is usually updated by mount(8) after booting. 218 */ 219 int 220 vfs_rootmountalloc(char *fstypename, char *devname, struct mount **mpp) 221 { 222 struct vfsconf *vfsp; 223 struct mount *mp; 224 225 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 226 if (!strcmp(vfsp->vfc_name, fstypename)) 227 break; 228 if (vfsp == NULL) 229 return (ENODEV); 230 mp = malloc(sizeof(*mp), M_MOUNT, M_WAITOK|M_ZERO); 231 (void)vfs_busy(mp, VB_READ|VB_NOWAIT); 232 LIST_INIT(&mp->mnt_vnodelist); 233 mp->mnt_vfc = vfsp; 234 mp->mnt_op = vfsp->vfc_vfsops; 235 mp->mnt_flag = MNT_RDONLY; 236 mp->mnt_vnodecovered = NULLVP; 237 vfsp->vfc_refcount++; 238 mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; 239 strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 240 mp->mnt_stat.f_mntonname[0] = '/'; 241 copystr(devname, mp->mnt_stat.f_mntfromname, MNAMELEN, 0); 242 copystr(devname, mp->mnt_stat.f_mntfromspec, MNAMELEN, 0); 243 *mpp = mp; 244 return (0); 245 } 246 247 /* 248 * Lookup a mount point by filesystem identifier. 249 */ 250 struct mount * 251 vfs_getvfs(fsid_t *fsid) 252 { 253 struct mount *mp; 254 255 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 256 if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && 257 mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { 258 return (mp); 259 } 260 } 261 262 return (NULL); 263 } 264 265 266 /* 267 * Get a new unique fsid 268 */ 269 void 270 vfs_getnewfsid(struct mount *mp) 271 { 272 static u_short xxxfs_mntid; 273 274 fsid_t tfsid; 275 int mtype; 276 277 mtype = mp->mnt_vfc->vfc_typenum; 278 mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + mtype, 0); 279 mp->mnt_stat.f_fsid.val[1] = mtype; 280 if (xxxfs_mntid == 0) 281 ++xxxfs_mntid; 282 tfsid.val[0] = makedev(nblkdev + mtype, xxxfs_mntid); 283 tfsid.val[1] = mtype; 284 if (!TAILQ_EMPTY(&mountlist)) { 285 while (vfs_getvfs(&tfsid)) { 286 tfsid.val[0]++; 287 xxxfs_mntid++; 288 } 289 } 290 mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; 291 } 292 293 /* 294 * Set vnode attributes to VNOVAL 295 */ 296 void 297 vattr_null(struct vattr *vap) 298 { 299 300 vap->va_type = VNON; 301 /* 302 * Don't get fancy: u_quad_t = u_int = VNOVAL leaves the u_quad_t 303 * with 2^31-1 instead of 2^64-1. Just write'm out and let 304 * the compiler do its job. 305 */ 306 vap->va_mode = VNOVAL; 307 vap->va_nlink = VNOVAL; 308 vap->va_uid = VNOVAL; 309 vap->va_gid = VNOVAL; 310 vap->va_fsid = VNOVAL; 311 vap->va_fileid = VNOVAL; 312 vap->va_size = VNOVAL; 313 vap->va_blocksize = VNOVAL; 314 vap->va_atime.tv_sec = VNOVAL; 315 vap->va_atime.tv_nsec = VNOVAL; 316 vap->va_mtime.tv_sec = VNOVAL; 317 vap->va_mtime.tv_nsec = VNOVAL; 318 vap->va_ctime.tv_sec = VNOVAL; 319 vap->va_ctime.tv_nsec = VNOVAL; 320 vap->va_gen = VNOVAL; 321 vap->va_flags = VNOVAL; 322 vap->va_rdev = VNOVAL; 323 vap->va_bytes = VNOVAL; 324 vap->va_filerev = VNOVAL; 325 vap->va_vaflags = 0; 326 } 327 328 /* 329 * Routines having to do with the management of the vnode table. 330 */ 331 long numvnodes; 332 333 /* 334 * Return the next vnode from the free list. 335 */ 336 int 337 getnewvnode(enum vtagtype tag, struct mount *mp, struct vops *vops, 338 struct vnode **vpp) 339 { 340 struct proc *p = curproc; 341 struct freelst *listhd; 342 static int toggle; 343 struct vnode *vp; 344 int s; 345 346 /* 347 * allow maxvnodes to increase if the buffer cache itself 348 * is big enough to justify it. (we don't shrink it ever) 349 */ 350 maxvnodes = maxvnodes < bcstats.numbufs ? bcstats.numbufs 351 : maxvnodes; 352 353 /* 354 * We must choose whether to allocate a new vnode or recycle an 355 * existing one. The criterion for allocating a new one is that 356 * the total number of vnodes is less than the number desired or 357 * there are no vnodes on either free list. Generally we only 358 * want to recycle vnodes that have no buffers associated with 359 * them, so we look first on the vnode_free_list. If it is empty, 360 * we next consider vnodes with referencing buffers on the 361 * vnode_hold_list. The toggle ensures that half the time we 362 * will use a buffer from the vnode_hold_list, and half the time 363 * we will allocate a new one unless the list has grown to twice 364 * the desired size. We are reticent to recycle vnodes from the 365 * vnode_hold_list because we will lose the identity of all its 366 * referencing buffers. 367 */ 368 toggle ^= 1; 369 if (numvnodes / 2 > maxvnodes) 370 toggle = 0; 371 372 s = splbio(); 373 if ((numvnodes < maxvnodes) || 374 ((TAILQ_FIRST(listhd = &vnode_free_list) == NULL) && 375 ((TAILQ_FIRST(listhd = &vnode_hold_list) == NULL) || toggle))) { 376 splx(s); 377 vp = pool_get(&vnode_pool, PR_WAITOK | PR_ZERO); 378 vp->v_uvm = pool_get(&uvm_vnode_pool, PR_WAITOK | PR_ZERO); 379 vp->v_uvm->u_vnode = vp; 380 RBT_INIT(buf_rb_bufs, &vp->v_bufs_tree); 381 cache_tree_init(&vp->v_nc_tree); 382 TAILQ_INIT(&vp->v_cache_dst); 383 numvnodes++; 384 } else { 385 TAILQ_FOREACH(vp, listhd, v_freelist) { 386 if (VOP_ISLOCKED(vp) == 0) 387 break; 388 } 389 /* 390 * Unless this is a bad time of the month, at most 391 * the first NCPUS items on the free list are 392 * locked, so this is close enough to being empty. 393 */ 394 if (vp == NULL) { 395 splx(s); 396 tablefull("vnode"); 397 *vpp = 0; 398 return (ENFILE); 399 } 400 401 #ifdef DIAGNOSTIC 402 if (vp->v_usecount) { 403 vprint("free vnode", vp); 404 panic("free vnode isn't"); 405 } 406 #endif 407 408 TAILQ_REMOVE(listhd, vp, v_freelist); 409 vp->v_bioflag &= ~VBIOONFREELIST; 410 splx(s); 411 412 if (vp->v_type != VBAD) 413 vgonel(vp, p); 414 #ifdef DIAGNOSTIC 415 if (vp->v_data) { 416 vprint("cleaned vnode", vp); 417 panic("cleaned vnode isn't"); 418 } 419 s = splbio(); 420 if (vp->v_numoutput) 421 panic("Clean vnode has pending I/O's"); 422 splx(s); 423 #endif 424 vp->v_flag = 0; 425 vp->v_socket = 0; 426 } 427 cache_purge(vp); 428 vp->v_type = VNON; 429 vp->v_tag = tag; 430 vp->v_op = vops; 431 insmntque(vp, mp); 432 *vpp = vp; 433 vp->v_usecount = 1; 434 vp->v_data = 0; 435 return (0); 436 } 437 438 /* 439 * Move a vnode from one mount queue to another. 440 */ 441 void 442 insmntque(struct vnode *vp, struct mount *mp) 443 { 444 /* 445 * Delete from old mount point vnode list, if on one. 446 */ 447 if (vp->v_mount != NULL) 448 LIST_REMOVE(vp, v_mntvnodes); 449 /* 450 * Insert into list of vnodes for the new mount point, if available. 451 */ 452 if ((vp->v_mount = mp) != NULL) 453 LIST_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes); 454 } 455 456 /* 457 * Create a vnode for a block device. 458 * Used for root filesystem, argdev, and swap areas. 459 * Also used for memory file system special devices. 460 */ 461 int 462 bdevvp(dev_t dev, struct vnode **vpp) 463 { 464 return (getdevvp(dev, vpp, VBLK)); 465 } 466 467 /* 468 * Create a vnode for a character device. 469 * Used for console handling. 470 */ 471 int 472 cdevvp(dev_t dev, struct vnode **vpp) 473 { 474 return (getdevvp(dev, vpp, VCHR)); 475 } 476 477 /* 478 * Create a vnode for a device. 479 * Used by bdevvp (block device) for root file system etc., 480 * and by cdevvp (character device) for console. 481 */ 482 int 483 getdevvp(dev_t dev, struct vnode **vpp, enum vtype type) 484 { 485 struct vnode *vp; 486 struct vnode *nvp; 487 int error; 488 489 if (dev == NODEV) { 490 *vpp = NULLVP; 491 return (0); 492 } 493 error = getnewvnode(VT_NON, NULL, &spec_vops, &nvp); 494 if (error) { 495 *vpp = NULLVP; 496 return (error); 497 } 498 vp = nvp; 499 vp->v_type = type; 500 if ((nvp = checkalias(vp, dev, NULL)) != 0) { 501 vput(vp); 502 vp = nvp; 503 } 504 if (vp->v_type == VCHR && cdevsw[major(vp->v_rdev)].d_type == D_TTY) 505 vp->v_flag |= VISTTY; 506 *vpp = vp; 507 return (0); 508 } 509 510 /* 511 * Check to see if the new vnode represents a special device 512 * for which we already have a vnode (either because of 513 * bdevvp() or because of a different vnode representing 514 * the same block device). If such an alias exists, deallocate 515 * the existing contents and return the aliased vnode. The 516 * caller is responsible for filling it with its new contents. 517 */ 518 struct vnode * 519 checkalias(struct vnode *nvp, dev_t nvp_rdev, struct mount *mp) 520 { 521 struct proc *p = curproc; 522 struct vnode *vp; 523 struct vnode **vpp; 524 525 if (nvp->v_type != VBLK && nvp->v_type != VCHR) 526 return (NULLVP); 527 528 vpp = &speclisth[SPECHASH(nvp_rdev)]; 529 loop: 530 for (vp = *vpp; vp; vp = vp->v_specnext) { 531 if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) { 532 continue; 533 } 534 /* 535 * Alias, but not in use, so flush it out. 536 */ 537 if (vp->v_usecount == 0) { 538 vgonel(vp, p); 539 goto loop; 540 } 541 if (vget(vp, LK_EXCLUSIVE, p)) { 542 goto loop; 543 } 544 break; 545 } 546 547 /* 548 * Common case is actually in the if statement 549 */ 550 if (vp == NULL || !(vp->v_tag == VT_NON && vp->v_type == VBLK)) { 551 nvp->v_specinfo = malloc(sizeof(struct specinfo), M_VNODE, 552 M_WAITOK); 553 nvp->v_rdev = nvp_rdev; 554 nvp->v_hashchain = vpp; 555 nvp->v_specnext = *vpp; 556 nvp->v_specmountpoint = NULL; 557 nvp->v_speclockf = NULL; 558 nvp->v_specbitmap = NULL; 559 if (nvp->v_type == VCHR && 560 (cdevsw[major(nvp_rdev)].d_flags & D_CLONE) && 561 (minor(nvp_rdev) >> CLONE_SHIFT == 0)) { 562 if (vp != NULLVP) 563 nvp->v_specbitmap = vp->v_specbitmap; 564 else 565 nvp->v_specbitmap = malloc(CLONE_MAPSZ, 566 M_VNODE, M_WAITOK | M_ZERO); 567 } 568 *vpp = nvp; 569 if (vp != NULLVP) { 570 nvp->v_flag |= VALIASED; 571 vp->v_flag |= VALIASED; 572 vput(vp); 573 } 574 return (NULLVP); 575 } 576 577 /* 578 * This code is the uncommon case. It is called in case 579 * we found an alias that was VT_NON && vtype of VBLK 580 * This means we found a block device that was created 581 * using bdevvp. 582 * An example of such a vnode is the root partition device vnode 583 * created in ffs_mountroot. 584 * 585 * The vnodes created by bdevvp should not be aliased (why?). 586 */ 587 588 VOP_UNLOCK(vp, p); 589 vclean(vp, 0, p); 590 vp->v_op = nvp->v_op; 591 vp->v_tag = nvp->v_tag; 592 nvp->v_type = VNON; 593 insmntque(vp, mp); 594 return (vp); 595 } 596 597 /* 598 * Grab a particular vnode from the free list, increment its 599 * reference count and lock it. If the vnode lock bit is set, 600 * the vnode is being eliminated in vgone. In that case, we 601 * cannot grab it, so the process is awakened when the 602 * transition is completed, and an error code is returned to 603 * indicate that the vnode is no longer usable, possibly 604 * having been changed to a new file system type. 605 */ 606 int 607 vget(struct vnode *vp, int flags, struct proc *p) 608 { 609 int error, s, onfreelist; 610 611 /* 612 * If the vnode is in the process of being cleaned out for 613 * another use, we wait for the cleaning to finish and then 614 * return failure. Cleaning is determined by checking that 615 * the VXLOCK flag is set. 616 */ 617 618 if (vp->v_flag & VXLOCK) { 619 if (flags & LK_NOWAIT) { 620 return (EBUSY); 621 } 622 623 vp->v_flag |= VXWANT; 624 tsleep(vp, PINOD, "vget", 0); 625 return (ENOENT); 626 } 627 628 onfreelist = vp->v_bioflag & VBIOONFREELIST; 629 if (vp->v_usecount == 0 && onfreelist) { 630 s = splbio(); 631 if (vp->v_holdcnt > 0) 632 TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist); 633 else 634 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 635 vp->v_bioflag &= ~VBIOONFREELIST; 636 splx(s); 637 } 638 639 vp->v_usecount++; 640 if (flags & LK_TYPE_MASK) { 641 if ((error = vn_lock(vp, flags, p)) != 0) { 642 vp->v_usecount--; 643 if (vp->v_usecount == 0 && onfreelist) 644 vputonfreelist(vp); 645 } 646 return (error); 647 } 648 649 return (0); 650 } 651 652 653 /* Vnode reference. */ 654 void 655 vref(struct vnode *vp) 656 { 657 #ifdef DIAGNOSTIC 658 if (vp->v_usecount == 0) 659 panic("vref used where vget required"); 660 if (vp->v_type == VNON) 661 panic("vref on a VNON vnode"); 662 #endif 663 vp->v_usecount++; 664 } 665 666 void 667 vputonfreelist(struct vnode *vp) 668 { 669 int s; 670 struct freelst *lst; 671 672 s = splbio(); 673 #ifdef DIAGNOSTIC 674 if (vp->v_usecount != 0) 675 panic("Use count is not zero!"); 676 677 if (vp->v_bioflag & VBIOONFREELIST) { 678 vprint("vnode already on free list: ", vp); 679 panic("vnode already on free list"); 680 } 681 #endif 682 683 vp->v_bioflag |= VBIOONFREELIST; 684 685 if (vp->v_holdcnt > 0) 686 lst = &vnode_hold_list; 687 else 688 lst = &vnode_free_list; 689 690 if (vp->v_type == VBAD) 691 TAILQ_INSERT_HEAD(lst, vp, v_freelist); 692 else 693 TAILQ_INSERT_TAIL(lst, vp, v_freelist); 694 695 splx(s); 696 } 697 698 /* 699 * vput(), just unlock and vrele() 700 */ 701 void 702 vput(struct vnode *vp) 703 { 704 struct proc *p = curproc; 705 706 #ifdef DIAGNOSTIC 707 if (vp == NULL) 708 panic("vput: null vp"); 709 #endif 710 711 #ifdef DIAGNOSTIC 712 if (vp->v_usecount == 0) { 713 vprint("vput: bad ref count", vp); 714 panic("vput: ref cnt"); 715 } 716 #endif 717 vp->v_usecount--; 718 if (vp->v_usecount > 0) { 719 VOP_UNLOCK(vp, p); 720 return; 721 } 722 723 #ifdef DIAGNOSTIC 724 if (vp->v_writecount != 0) { 725 vprint("vput: bad writecount", vp); 726 panic("vput: v_writecount != 0"); 727 } 728 #endif 729 730 VOP_INACTIVE(vp, p); 731 732 if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST)) 733 vputonfreelist(vp); 734 } 735 736 /* 737 * Vnode release - use for active VNODES. 738 * If count drops to zero, call inactive routine and return to freelist. 739 * Returns 0 if it did not sleep. 740 */ 741 int 742 vrele(struct vnode *vp) 743 { 744 struct proc *p = curproc; 745 746 #ifdef DIAGNOSTIC 747 if (vp == NULL) 748 panic("vrele: null vp"); 749 #endif 750 #ifdef DIAGNOSTIC 751 if (vp->v_usecount == 0) { 752 vprint("vrele: bad ref count", vp); 753 panic("vrele: ref cnt"); 754 } 755 #endif 756 vp->v_usecount--; 757 if (vp->v_usecount > 0) { 758 return (0); 759 } 760 761 #ifdef DIAGNOSTIC 762 if (vp->v_writecount != 0) { 763 vprint("vrele: bad writecount", vp); 764 panic("vrele: v_writecount != 0"); 765 } 766 #endif 767 768 if (vn_lock(vp, LK_EXCLUSIVE, p)) { 769 #ifdef DIAGNOSTIC 770 vprint("vrele: cannot lock", vp); 771 #endif 772 return (1); 773 } 774 775 VOP_INACTIVE(vp, p); 776 777 if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST)) 778 vputonfreelist(vp); 779 return (1); 780 } 781 782 /* Page or buffer structure gets a reference. */ 783 void 784 vhold(struct vnode *vp) 785 { 786 /* 787 * If it is on the freelist and the hold count is currently 788 * zero, move it to the hold list. 789 */ 790 if ((vp->v_bioflag & VBIOONFREELIST) && 791 vp->v_holdcnt == 0 && vp->v_usecount == 0) { 792 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 793 TAILQ_INSERT_TAIL(&vnode_hold_list, vp, v_freelist); 794 } 795 vp->v_holdcnt++; 796 } 797 798 /* Lose interest in a vnode. */ 799 void 800 vdrop(struct vnode *vp) 801 { 802 #ifdef DIAGNOSTIC 803 if (vp->v_holdcnt == 0) 804 panic("vdrop: zero holdcnt"); 805 #endif 806 807 vp->v_holdcnt--; 808 809 /* 810 * If it is on the holdlist and the hold count drops to 811 * zero, move it to the free list. 812 */ 813 if ((vp->v_bioflag & VBIOONFREELIST) && 814 vp->v_holdcnt == 0 && vp->v_usecount == 0) { 815 TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist); 816 TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); 817 } 818 } 819 820 /* 821 * Remove any vnodes in the vnode table belonging to mount point mp. 822 * 823 * If MNT_NOFORCE is specified, there should not be any active ones, 824 * return error if any are found (nb: this is a user error, not a 825 * system error). If MNT_FORCE is specified, detach any active vnodes 826 * that are found. 827 */ 828 #ifdef DEBUG 829 int busyprt = 0; /* print out busy vnodes */ 830 struct ctldebug debug1 = { "busyprt", &busyprt }; 831 #endif 832 833 int 834 vfs_mount_foreach_vnode(struct mount *mp, 835 int (*func)(struct vnode *, void *), void *arg) { 836 struct vnode *vp, *nvp; 837 int error = 0; 838 839 loop: 840 LIST_FOREACH_SAFE(vp , &mp->mnt_vnodelist, v_mntvnodes, nvp) { 841 if (vp->v_mount != mp) 842 goto loop; 843 844 error = func(vp, arg); 845 846 if (error != 0) 847 break; 848 } 849 850 return (error); 851 } 852 853 struct vflush_args { 854 struct vnode *skipvp; 855 int busy; 856 int flags; 857 }; 858 859 int 860 vflush_vnode(struct vnode *vp, void *arg) { 861 struct vflush_args *va = arg; 862 struct proc *p = curproc; 863 864 if (vp == va->skipvp) { 865 return (0); 866 } 867 868 if ((va->flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) { 869 return (0); 870 } 871 872 /* 873 * If WRITECLOSE is set, only flush out regular file 874 * vnodes open for writing. 875 */ 876 if ((va->flags & WRITECLOSE) && 877 (vp->v_writecount == 0 || vp->v_type != VREG)) { 878 return (0); 879 } 880 881 /* 882 * With v_usecount == 0, all we need to do is clear 883 * out the vnode data structures and we are done. 884 */ 885 if (vp->v_usecount == 0) { 886 vgonel(vp, p); 887 return (0); 888 } 889 890 /* 891 * If FORCECLOSE is set, forcibly close the vnode. 892 * For block or character devices, revert to an 893 * anonymous device. For all other files, just kill them. 894 */ 895 if (va->flags & FORCECLOSE) { 896 if (vp->v_type != VBLK && vp->v_type != VCHR) { 897 vgonel(vp, p); 898 } else { 899 vclean(vp, 0, p); 900 vp->v_op = &spec_vops; 901 insmntque(vp, NULL); 902 } 903 return (0); 904 } 905 906 #ifdef DEBUG 907 if (busyprt) 908 vprint("vflush: busy vnode", vp); 909 #endif 910 va->busy++; 911 return (0); 912 } 913 914 int 915 vflush(struct mount *mp, struct vnode *skipvp, int flags) 916 { 917 struct vflush_args va; 918 va.skipvp = skipvp; 919 va.busy = 0; 920 va.flags = flags; 921 922 vfs_mount_foreach_vnode(mp, vflush_vnode, &va); 923 924 if (va.busy) 925 return (EBUSY); 926 return (0); 927 } 928 929 /* 930 * Disassociate the underlying file system from a vnode. 931 */ 932 void 933 vclean(struct vnode *vp, int flags, struct proc *p) 934 { 935 int active; 936 937 /* 938 * Check to see if the vnode is in use. 939 * If so we have to reference it before we clean it out 940 * so that its count cannot fall to zero and generate a 941 * race against ourselves to recycle it. 942 */ 943 if ((active = vp->v_usecount) != 0) 944 vp->v_usecount++; 945 946 /* 947 * Prevent the vnode from being recycled or 948 * brought into use while we clean it out. 949 */ 950 if (vp->v_flag & VXLOCK) 951 panic("vclean: deadlock"); 952 vp->v_flag |= VXLOCK; 953 /* 954 * Even if the count is zero, the VOP_INACTIVE routine may still 955 * have the object locked while it cleans it out. The VOP_LOCK 956 * ensures that the VOP_INACTIVE routine is done with its work. 957 * For active vnodes, it ensures that no other activity can 958 * occur while the underlying object is being cleaned out. 959 */ 960 VOP_LOCK(vp, LK_DRAIN | LK_EXCLUSIVE, p); 961 962 /* 963 * Clean out any VM data associated with the vnode. 964 */ 965 uvm_vnp_terminate(vp); 966 /* 967 * Clean out any buffers associated with the vnode. 968 */ 969 if (flags & DOCLOSE) 970 vinvalbuf(vp, V_SAVE, NOCRED, p, 0, 0); 971 /* 972 * If purging an active vnode, it must be closed and 973 * deactivated before being reclaimed. Note that the 974 * VOP_INACTIVE will unlock the vnode 975 */ 976 if (active) { 977 if (flags & DOCLOSE) 978 VOP_CLOSE(vp, FNONBLOCK, NOCRED, p); 979 VOP_INACTIVE(vp, p); 980 } else { 981 /* 982 * Any other processes trying to obtain this lock must first 983 * wait for VXLOCK to clear, then call the new lock operation. 984 */ 985 VOP_UNLOCK(vp, p); 986 } 987 988 /* 989 * Reclaim the vnode. 990 */ 991 if (VOP_RECLAIM(vp, p)) 992 panic("vclean: cannot reclaim"); 993 if (active) { 994 vp->v_usecount--; 995 if (vp->v_usecount == 0) { 996 if (vp->v_holdcnt > 0) 997 panic("vclean: not clean"); 998 vputonfreelist(vp); 999 } 1000 } 1001 cache_purge(vp); 1002 1003 /* 1004 * Done with purge, notify sleepers of the grim news. 1005 */ 1006 vp->v_op = &dead_vops; 1007 VN_KNOTE(vp, NOTE_REVOKE); 1008 vp->v_tag = VT_NON; 1009 vp->v_flag &= ~VXLOCK; 1010 #ifdef VFSLCKDEBUG 1011 vp->v_flag &= ~VLOCKSWORK; 1012 #endif 1013 if (vp->v_flag & VXWANT) { 1014 vp->v_flag &= ~VXWANT; 1015 wakeup(vp); 1016 } 1017 } 1018 1019 /* 1020 * Recycle an unused vnode to the front of the free list. 1021 */ 1022 int 1023 vrecycle(struct vnode *vp, struct proc *p) 1024 { 1025 if (vp->v_usecount == 0) { 1026 vgonel(vp, p); 1027 return (1); 1028 } 1029 return (0); 1030 } 1031 1032 /* 1033 * Eliminate all activity associated with a vnode 1034 * in preparation for reuse. 1035 */ 1036 void 1037 vgone(struct vnode *vp) 1038 { 1039 struct proc *p = curproc; 1040 vgonel(vp, p); 1041 } 1042 1043 /* 1044 * vgone, with struct proc. 1045 */ 1046 void 1047 vgonel(struct vnode *vp, struct proc *p) 1048 { 1049 struct vnode *vq; 1050 struct vnode *vx; 1051 1052 /* 1053 * If a vgone (or vclean) is already in progress, 1054 * wait until it is done and return. 1055 */ 1056 if (vp->v_flag & VXLOCK) { 1057 vp->v_flag |= VXWANT; 1058 tsleep(vp, PINOD, "vgone", 0); 1059 return; 1060 } 1061 1062 /* 1063 * Clean out the filesystem specific data. 1064 */ 1065 vclean(vp, DOCLOSE, p); 1066 /* 1067 * Delete from old mount point vnode list, if on one. 1068 */ 1069 if (vp->v_mount != NULL) 1070 insmntque(vp, NULL); 1071 /* 1072 * If special device, remove it from special device alias list 1073 * if it is on one. 1074 */ 1075 if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_specinfo != 0) { 1076 if ((vp->v_flag & VALIASED) == 0 && vp->v_type == VCHR && 1077 (cdevsw[major(vp->v_rdev)].d_flags & D_CLONE) && 1078 (minor(vp->v_rdev) >> CLONE_SHIFT == 0)) { 1079 free(vp->v_specbitmap, M_VNODE, CLONE_MAPSZ); 1080 } 1081 if (*vp->v_hashchain == vp) { 1082 *vp->v_hashchain = vp->v_specnext; 1083 } else { 1084 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1085 if (vq->v_specnext != vp) 1086 continue; 1087 vq->v_specnext = vp->v_specnext; 1088 break; 1089 } 1090 if (vq == NULL) 1091 panic("missing bdev"); 1092 } 1093 if (vp->v_flag & VALIASED) { 1094 vx = NULL; 1095 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1096 if (vq->v_rdev != vp->v_rdev || 1097 vq->v_type != vp->v_type) 1098 continue; 1099 if (vx) 1100 break; 1101 vx = vq; 1102 } 1103 if (vx == NULL) 1104 panic("missing alias"); 1105 if (vq == NULL) 1106 vx->v_flag &= ~VALIASED; 1107 vp->v_flag &= ~VALIASED; 1108 } 1109 free(vp->v_specinfo, M_VNODE, sizeof(struct specinfo)); 1110 vp->v_specinfo = NULL; 1111 } 1112 /* 1113 * If it is on the freelist and not already at the head, 1114 * move it to the head of the list. 1115 */ 1116 vp->v_type = VBAD; 1117 1118 /* 1119 * Move onto the free list, unless we were called from 1120 * getnewvnode and we're not on any free list 1121 */ 1122 if (vp->v_usecount == 0 && 1123 (vp->v_bioflag & VBIOONFREELIST)) { 1124 int s; 1125 1126 s = splbio(); 1127 1128 if (vp->v_holdcnt > 0) 1129 panic("vgonel: not clean"); 1130 1131 if (TAILQ_FIRST(&vnode_free_list) != vp) { 1132 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 1133 TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); 1134 } 1135 splx(s); 1136 } 1137 } 1138 1139 /* 1140 * Lookup a vnode by device number. 1141 */ 1142 int 1143 vfinddev(dev_t dev, enum vtype type, struct vnode **vpp) 1144 { 1145 struct vnode *vp; 1146 int rc =0; 1147 1148 for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { 1149 if (dev != vp->v_rdev || type != vp->v_type) 1150 continue; 1151 *vpp = vp; 1152 rc = 1; 1153 break; 1154 } 1155 return (rc); 1156 } 1157 1158 /* 1159 * Revoke all the vnodes corresponding to the specified minor number 1160 * range (endpoints inclusive) of the specified major. 1161 */ 1162 void 1163 vdevgone(int maj, int minl, int minh, enum vtype type) 1164 { 1165 struct vnode *vp; 1166 int mn; 1167 1168 for (mn = minl; mn <= minh; mn++) 1169 if (vfinddev(makedev(maj, mn), type, &vp)) 1170 VOP_REVOKE(vp, REVOKEALL); 1171 } 1172 1173 /* 1174 * Calculate the total number of references to a special device. 1175 */ 1176 int 1177 vcount(struct vnode *vp) 1178 { 1179 struct vnode *vq, *vnext; 1180 int count; 1181 1182 loop: 1183 if ((vp->v_flag & VALIASED) == 0) 1184 return (vp->v_usecount); 1185 for (count = 0, vq = *vp->v_hashchain; vq; vq = vnext) { 1186 vnext = vq->v_specnext; 1187 if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) 1188 continue; 1189 /* 1190 * Alias, but not in use, so flush it out. 1191 */ 1192 if (vq->v_usecount == 0 && vq != vp) { 1193 vgone(vq); 1194 goto loop; 1195 } 1196 count += vq->v_usecount; 1197 } 1198 return (count); 1199 } 1200 1201 #if defined(DEBUG) || defined(DIAGNOSTIC) 1202 /* 1203 * Print out a description of a vnode. 1204 */ 1205 static char *typename[] = 1206 { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; 1207 1208 void 1209 vprint(char *label, struct vnode *vp) 1210 { 1211 char buf[64]; 1212 1213 if (label != NULL) 1214 printf("%s: ", label); 1215 printf("%p, type %s, use %u, write %u, hold %u,", 1216 vp, typename[vp->v_type], vp->v_usecount, vp->v_writecount, 1217 vp->v_holdcnt); 1218 buf[0] = '\0'; 1219 if (vp->v_flag & VROOT) 1220 strlcat(buf, "|VROOT", sizeof buf); 1221 if (vp->v_flag & VTEXT) 1222 strlcat(buf, "|VTEXT", sizeof buf); 1223 if (vp->v_flag & VSYSTEM) 1224 strlcat(buf, "|VSYSTEM", sizeof buf); 1225 if (vp->v_flag & VXLOCK) 1226 strlcat(buf, "|VXLOCK", sizeof buf); 1227 if (vp->v_flag & VXWANT) 1228 strlcat(buf, "|VXWANT", sizeof buf); 1229 if (vp->v_bioflag & VBIOWAIT) 1230 strlcat(buf, "|VBIOWAIT", sizeof buf); 1231 if (vp->v_bioflag & VBIOONFREELIST) 1232 strlcat(buf, "|VBIOONFREELIST", sizeof buf); 1233 if (vp->v_bioflag & VBIOONSYNCLIST) 1234 strlcat(buf, "|VBIOONSYNCLIST", sizeof buf); 1235 if (vp->v_flag & VALIASED) 1236 strlcat(buf, "|VALIASED", sizeof buf); 1237 if (buf[0] != '\0') 1238 printf(" flags (%s)", &buf[1]); 1239 if (vp->v_data == NULL) { 1240 printf("\n"); 1241 } else { 1242 printf("\n\t"); 1243 VOP_PRINT(vp); 1244 } 1245 } 1246 #endif /* DEBUG || DIAGNOSTIC */ 1247 1248 #ifdef DEBUG 1249 /* 1250 * List all of the locked vnodes in the system. 1251 * Called when debugging the kernel. 1252 */ 1253 void 1254 printlockedvnodes(void) 1255 { 1256 struct mount *mp; 1257 struct vnode *vp; 1258 1259 printf("Locked vnodes\n"); 1260 1261 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 1262 if (vfs_busy(mp, VB_READ|VB_NOWAIT)) 1263 continue; 1264 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 1265 if (VOP_ISLOCKED(vp)) 1266 vprint(NULL, vp); 1267 } 1268 vfs_unbusy(mp); 1269 } 1270 1271 } 1272 #endif 1273 1274 /* 1275 * Top level filesystem related information gathering. 1276 */ 1277 int 1278 vfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 1279 size_t newlen, struct proc *p) 1280 { 1281 struct vfsconf *vfsp, *tmpvfsp; 1282 int ret; 1283 1284 /* all sysctl names at this level are at least name and field */ 1285 if (namelen < 2) 1286 return (ENOTDIR); /* overloaded */ 1287 1288 if (name[0] != VFS_GENERIC) { 1289 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 1290 if (vfsp->vfc_typenum == name[0]) 1291 break; 1292 1293 if (vfsp == NULL || vfsp->vfc_vfsops->vfs_sysctl == NULL) 1294 return (EOPNOTSUPP); 1295 1296 return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1, 1297 oldp, oldlenp, newp, newlen, p)); 1298 } 1299 1300 switch (name[1]) { 1301 case VFS_MAXTYPENUM: 1302 return (sysctl_rdint(oldp, oldlenp, newp, maxvfsconf)); 1303 1304 case VFS_CONF: 1305 if (namelen < 3) 1306 return (ENOTDIR); /* overloaded */ 1307 1308 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 1309 if (vfsp->vfc_typenum == name[2]) 1310 break; 1311 1312 if (vfsp == NULL) 1313 return (EOPNOTSUPP); 1314 1315 /* Make a copy, clear out kernel pointers */ 1316 tmpvfsp = malloc(sizeof(*tmpvfsp), M_TEMP, M_WAITOK|M_ZERO); 1317 memcpy(tmpvfsp, vfsp, sizeof(*tmpvfsp)); 1318 tmpvfsp->vfc_vfsops = NULL; 1319 tmpvfsp->vfc_next = NULL; 1320 1321 ret = sysctl_rdstruct(oldp, oldlenp, newp, tmpvfsp, 1322 sizeof(struct vfsconf)); 1323 1324 free(tmpvfsp, M_TEMP, sizeof(*tmpvfsp)); 1325 return (ret); 1326 case VFS_BCACHESTAT: /* buffer cache statistics */ 1327 ret = sysctl_rdstruct(oldp, oldlenp, newp, &bcstats, 1328 sizeof(struct bcachestats)); 1329 return(ret); 1330 } 1331 return (EOPNOTSUPP); 1332 } 1333 1334 /* 1335 * Check to see if a filesystem is mounted on a block device. 1336 */ 1337 int 1338 vfs_mountedon(struct vnode *vp) 1339 { 1340 struct vnode *vq; 1341 int error = 0; 1342 1343 if (vp->v_specmountpoint != NULL) 1344 return (EBUSY); 1345 if (vp->v_flag & VALIASED) { 1346 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1347 if (vq->v_rdev != vp->v_rdev || 1348 vq->v_type != vp->v_type) 1349 continue; 1350 if (vq->v_specmountpoint != NULL) { 1351 error = EBUSY; 1352 break; 1353 } 1354 } 1355 } 1356 return (error); 1357 } 1358 1359 #ifdef NFSSERVER 1360 /* 1361 * Build hash lists of net addresses and hang them off the mount point. 1362 * Called by vfs_export() to set up the lists of export addresses. 1363 */ 1364 int 1365 vfs_hang_addrlist(struct mount *mp, struct netexport *nep, 1366 struct export_args *argp) 1367 { 1368 struct netcred *np; 1369 struct radix_node_head *rnh; 1370 int nplen, i; 1371 struct radix_node *rn; 1372 struct sockaddr *saddr, *smask = 0; 1373 int error; 1374 1375 if (argp->ex_addrlen == 0) { 1376 if (mp->mnt_flag & MNT_DEFEXPORTED) 1377 return (EPERM); 1378 np = &nep->ne_defexported; 1379 /* fill in the kernel's ucred from userspace's xucred */ 1380 if ((error = crfromxucred(&np->netc_anon, &argp->ex_anon))) 1381 return (error); 1382 mp->mnt_flag |= MNT_DEFEXPORTED; 1383 goto finish; 1384 } 1385 if (argp->ex_addrlen > MLEN || argp->ex_masklen > MLEN || 1386 argp->ex_addrlen < 0 || argp->ex_masklen < 0) 1387 return (EINVAL); 1388 nplen = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; 1389 np = (struct netcred *)malloc(nplen, M_NETADDR, M_WAITOK|M_ZERO); 1390 saddr = (struct sockaddr *)(np + 1); 1391 error = copyin(argp->ex_addr, saddr, argp->ex_addrlen); 1392 if (error) 1393 goto out; 1394 if (saddr->sa_len > argp->ex_addrlen) 1395 saddr->sa_len = argp->ex_addrlen; 1396 if (argp->ex_masklen) { 1397 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen); 1398 error = copyin(argp->ex_mask, smask, argp->ex_masklen); 1399 if (error) 1400 goto out; 1401 if (smask->sa_len > argp->ex_masklen) 1402 smask->sa_len = argp->ex_masklen; 1403 } 1404 /* fill in the kernel's ucred from userspace's xucred */ 1405 if ((error = crfromxucred(&np->netc_anon, &argp->ex_anon))) 1406 goto out; 1407 i = saddr->sa_family; 1408 switch (i) { 1409 case AF_INET: 1410 if ((rnh = nep->ne_rtable_inet) == NULL) { 1411 if (!rn_inithead((void **)&nep->ne_rtable_inet, 1412 offsetof(struct sockaddr_in, sin_addr))) { 1413 error = ENOBUFS; 1414 goto out; 1415 } 1416 rnh = nep->ne_rtable_inet; 1417 } 1418 break; 1419 default: 1420 error = EINVAL; 1421 goto out; 1422 } 1423 rn = rn_addroute(saddr, smask, rnh, np->netc_rnodes, 0); 1424 if (rn == 0 || np != (struct netcred *)rn) { /* already exists */ 1425 error = EPERM; 1426 goto out; 1427 } 1428 finish: 1429 np->netc_exflags = argp->ex_flags; 1430 return (0); 1431 out: 1432 free(np, M_NETADDR, nplen); 1433 return (error); 1434 } 1435 1436 int 1437 vfs_free_netcred(struct radix_node *rn, void *w, u_int id) 1438 { 1439 struct radix_node_head *rnh = (struct radix_node_head *)w; 1440 1441 rn_delete(rn->rn_key, rn->rn_mask, rnh, NULL); 1442 free(rn, M_NETADDR, 0); 1443 return (0); 1444 } 1445 1446 /* 1447 * Free the net address hash lists that are hanging off the mount points. 1448 */ 1449 void 1450 vfs_free_addrlist(struct netexport *nep) 1451 { 1452 struct radix_node_head *rnh; 1453 1454 if ((rnh = nep->ne_rtable_inet) != NULL) { 1455 rn_walktree(rnh, vfs_free_netcred, rnh); 1456 free(rnh, M_RTABLE, 0); 1457 nep->ne_rtable_inet = NULL; 1458 } 1459 } 1460 #endif /* NFSSERVER */ 1461 1462 int 1463 vfs_export(struct mount *mp, struct netexport *nep, struct export_args *argp) 1464 { 1465 #ifdef NFSSERVER 1466 int error; 1467 1468 if (argp->ex_flags & MNT_DELEXPORT) { 1469 vfs_free_addrlist(nep); 1470 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 1471 } 1472 if (argp->ex_flags & MNT_EXPORTED) { 1473 if ((error = vfs_hang_addrlist(mp, nep, argp)) != 0) 1474 return (error); 1475 mp->mnt_flag |= MNT_EXPORTED; 1476 } 1477 return (0); 1478 #else 1479 return (ENOTSUP); 1480 #endif /* NFSSERVER */ 1481 } 1482 1483 struct netcred * 1484 vfs_export_lookup(struct mount *mp, struct netexport *nep, struct mbuf *nam) 1485 { 1486 #ifdef NFSSERVER 1487 struct netcred *np; 1488 struct radix_node_head *rnh; 1489 struct sockaddr *saddr; 1490 1491 np = NULL; 1492 if (mp->mnt_flag & MNT_EXPORTED) { 1493 /* 1494 * Lookup in the export list first. 1495 */ 1496 if (nam != NULL) { 1497 saddr = mtod(nam, struct sockaddr *); 1498 switch(saddr->sa_family) { 1499 case AF_INET: 1500 rnh = nep->ne_rtable_inet; 1501 break; 1502 default: 1503 rnh = NULL; 1504 break; 1505 } 1506 if (rnh != NULL) 1507 np = (struct netcred *)rn_match(saddr, rnh); 1508 } 1509 /* 1510 * If no address match, use the default if it exists. 1511 */ 1512 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED) 1513 np = &nep->ne_defexported; 1514 } 1515 return (np); 1516 #else 1517 return (NULL); 1518 #endif /* NFSSERVER */ 1519 } 1520 1521 /* 1522 * Do the usual access checking. 1523 * file_mode, uid and gid are from the vnode in question, 1524 * while acc_mode and cred are from the VOP_ACCESS parameter list 1525 */ 1526 int 1527 vaccess(enum vtype type, mode_t file_mode, uid_t uid, gid_t gid, 1528 mode_t acc_mode, struct ucred *cred) 1529 { 1530 mode_t mask; 1531 1532 /* User id 0 always gets read/write access. */ 1533 if (cred->cr_uid == 0) { 1534 /* For VEXEC, at least one of the execute bits must be set. */ 1535 if ((acc_mode & VEXEC) && type != VDIR && 1536 (file_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) 1537 return EACCES; 1538 return 0; 1539 } 1540 1541 mask = 0; 1542 1543 /* Otherwise, check the owner. */ 1544 if (cred->cr_uid == uid) { 1545 if (acc_mode & VEXEC) 1546 mask |= S_IXUSR; 1547 if (acc_mode & VREAD) 1548 mask |= S_IRUSR; 1549 if (acc_mode & VWRITE) 1550 mask |= S_IWUSR; 1551 return (file_mode & mask) == mask ? 0 : EACCES; 1552 } 1553 1554 /* Otherwise, check the groups. */ 1555 if (groupmember(gid, cred)) { 1556 if (acc_mode & VEXEC) 1557 mask |= S_IXGRP; 1558 if (acc_mode & VREAD) 1559 mask |= S_IRGRP; 1560 if (acc_mode & VWRITE) 1561 mask |= S_IWGRP; 1562 return (file_mode & mask) == mask ? 0 : EACCES; 1563 } 1564 1565 /* Otherwise, check everyone else. */ 1566 if (acc_mode & VEXEC) 1567 mask |= S_IXOTH; 1568 if (acc_mode & VREAD) 1569 mask |= S_IROTH; 1570 if (acc_mode & VWRITE) 1571 mask |= S_IWOTH; 1572 return (file_mode & mask) == mask ? 0 : EACCES; 1573 } 1574 1575 /* 1576 * Unmount all file systems. 1577 * We traverse the list in reverse order under the assumption that doing so 1578 * will avoid needing to worry about dependencies. 1579 */ 1580 void 1581 vfs_unmountall(void) 1582 { 1583 struct mount *mp, *nmp; 1584 int allerror, error, again = 1; 1585 1586 retry: 1587 allerror = 0; 1588 TAILQ_FOREACH_REVERSE_SAFE(mp, &mountlist, mntlist, mnt_list, nmp) { 1589 if (vfs_busy(mp, VB_WRITE|VB_NOWAIT)) 1590 continue; 1591 /* XXX Here is a race, the next pointer is not locked. */ 1592 if ((error = dounmount(mp, MNT_FORCE, curproc)) != 0) { 1593 printf("unmount of %s failed with error %d\n", 1594 mp->mnt_stat.f_mntonname, error); 1595 allerror = 1; 1596 } 1597 } 1598 1599 if (allerror) { 1600 printf("WARNING: some file systems would not unmount\n"); 1601 if (again) { 1602 printf("retrying\n"); 1603 again = 0; 1604 goto retry; 1605 } 1606 } 1607 } 1608 1609 /* 1610 * Sync and unmount file systems before shutting down. 1611 */ 1612 void 1613 vfs_shutdown(void) 1614 { 1615 #ifdef ACCOUNTING 1616 acct_shutdown(); 1617 #endif 1618 1619 /* XXX Should suspend scheduling. */ 1620 (void) spl0(); 1621 1622 printf("syncing disks... "); 1623 1624 if (panicstr == 0) { 1625 /* Sync before unmount, in case we hang on something. */ 1626 sys_sync(&proc0, NULL, NULL); 1627 1628 /* Unmount file systems. */ 1629 vfs_unmountall(); 1630 } 1631 1632 if (vfs_syncwait(1)) 1633 printf("giving up\n"); 1634 else 1635 printf("done\n"); 1636 1637 #if NSOFTRAID > 0 1638 sr_shutdown(); 1639 #endif 1640 } 1641 1642 /* 1643 * perform sync() operation and wait for buffers to flush. 1644 * assumptions: called w/ scheduler disabled and physical io enabled 1645 * for now called at spl0() XXX 1646 */ 1647 int 1648 vfs_syncwait(int verbose) 1649 { 1650 struct buf *bp; 1651 int iter, nbusy, dcount, s; 1652 struct proc *p; 1653 #ifdef MULTIPROCESSOR 1654 int hold_count; 1655 #endif 1656 1657 p = curproc? curproc : &proc0; 1658 sys_sync(p, NULL, NULL); 1659 1660 /* Wait for sync to finish. */ 1661 dcount = 10000; 1662 for (iter = 0; iter < 20; iter++) { 1663 nbusy = 0; 1664 LIST_FOREACH(bp, &bufhead, b_list) { 1665 if ((bp->b_flags & (B_BUSY|B_INVAL|B_READ)) == B_BUSY) 1666 nbusy++; 1667 /* 1668 * With soft updates, some buffers that are 1669 * written will be remarked as dirty until other 1670 * buffers are written. 1671 */ 1672 if (bp->b_flags & B_DELWRI) { 1673 s = splbio(); 1674 bremfree(bp); 1675 buf_acquire(bp); 1676 splx(s); 1677 nbusy++; 1678 bawrite(bp); 1679 if (dcount-- <= 0) { 1680 if (verbose) 1681 printf("softdep "); 1682 return 1; 1683 } 1684 } 1685 } 1686 if (nbusy == 0) 1687 break; 1688 if (verbose) 1689 printf("%d ", nbusy); 1690 #ifdef MULTIPROCESSOR 1691 if (__mp_lock_held(&kernel_lock)) 1692 hold_count = __mp_release_all(&kernel_lock); 1693 else 1694 hold_count = 0; 1695 #endif 1696 DELAY(40000 * iter); 1697 #ifdef MULTIPROCESSOR 1698 if (hold_count) 1699 __mp_acquire_count(&kernel_lock, hold_count); 1700 #endif 1701 } 1702 1703 return nbusy; 1704 } 1705 1706 /* 1707 * posix file system related system variables. 1708 */ 1709 int 1710 fs_posix_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, 1711 void *newp, size_t newlen, struct proc *p) 1712 { 1713 /* all sysctl names at this level are terminal */ 1714 if (namelen != 1) 1715 return (ENOTDIR); 1716 1717 switch (name[0]) { 1718 case FS_POSIX_SETUID: 1719 if (newp && securelevel > 0) 1720 return (EPERM); 1721 return(sysctl_int(oldp, oldlenp, newp, newlen, &suid_clear)); 1722 default: 1723 return (EOPNOTSUPP); 1724 } 1725 /* NOTREACHED */ 1726 } 1727 1728 /* 1729 * file system related system variables. 1730 */ 1731 int 1732 fs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 1733 size_t newlen, struct proc *p) 1734 { 1735 sysctlfn *fn; 1736 1737 switch (name[0]) { 1738 case FS_POSIX: 1739 fn = fs_posix_sysctl; 1740 break; 1741 default: 1742 return (EOPNOTSUPP); 1743 } 1744 return (*fn)(name + 1, namelen - 1, oldp, oldlenp, newp, newlen, p); 1745 } 1746 1747 1748 /* 1749 * Routines dealing with vnodes and buffers 1750 */ 1751 1752 /* 1753 * Wait for all outstanding I/Os to complete 1754 * 1755 * Manipulates v_numoutput. Must be called at splbio() 1756 */ 1757 int 1758 vwaitforio(struct vnode *vp, int slpflag, char *wmesg, int timeo) 1759 { 1760 int error = 0; 1761 1762 splassert(IPL_BIO); 1763 1764 while (vp->v_numoutput) { 1765 vp->v_bioflag |= VBIOWAIT; 1766 error = tsleep(&vp->v_numoutput, 1767 slpflag | (PRIBIO + 1), wmesg, timeo); 1768 if (error) 1769 break; 1770 } 1771 1772 return (error); 1773 } 1774 1775 /* 1776 * Update outstanding I/O count and do wakeup if requested. 1777 * 1778 * Manipulates v_numoutput. Must be called at splbio() 1779 */ 1780 void 1781 vwakeup(struct vnode *vp) 1782 { 1783 splassert(IPL_BIO); 1784 1785 if (vp != NULL) { 1786 if (vp->v_numoutput-- == 0) 1787 panic("vwakeup: neg numoutput"); 1788 if ((vp->v_bioflag & VBIOWAIT) && vp->v_numoutput == 0) { 1789 vp->v_bioflag &= ~VBIOWAIT; 1790 wakeup(&vp->v_numoutput); 1791 } 1792 } 1793 } 1794 1795 /* 1796 * Flush out and invalidate all buffers associated with a vnode. 1797 * Called with the underlying object locked. 1798 */ 1799 int 1800 vinvalbuf(struct vnode *vp, int flags, struct ucred *cred, struct proc *p, 1801 int slpflag, int slptimeo) 1802 { 1803 struct buf *bp; 1804 struct buf *nbp, *blist; 1805 int s, error; 1806 1807 #ifdef VFSLCKDEBUG 1808 if ((vp->v_flag & VLOCKSWORK) && !VOP_ISLOCKED(vp)) 1809 panic("vinvalbuf(): vp isn't locked"); 1810 #endif 1811 1812 if (flags & V_SAVE) { 1813 s = splbio(); 1814 vwaitforio(vp, 0, "vinvalbuf", 0); 1815 if (!LIST_EMPTY(&vp->v_dirtyblkhd)) { 1816 splx(s); 1817 if ((error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) != 0) 1818 return (error); 1819 s = splbio(); 1820 if (vp->v_numoutput > 0 || 1821 !LIST_EMPTY(&vp->v_dirtyblkhd)) 1822 panic("vinvalbuf: dirty bufs"); 1823 } 1824 splx(s); 1825 } 1826 loop: 1827 s = splbio(); 1828 for (;;) { 1829 if ((blist = LIST_FIRST(&vp->v_cleanblkhd)) && 1830 (flags & V_SAVEMETA)) 1831 while (blist && blist->b_lblkno < 0) 1832 blist = LIST_NEXT(blist, b_vnbufs); 1833 if (blist == NULL && 1834 (blist = LIST_FIRST(&vp->v_dirtyblkhd)) && 1835 (flags & V_SAVEMETA)) 1836 while (blist && blist->b_lblkno < 0) 1837 blist = LIST_NEXT(blist, b_vnbufs); 1838 if (!blist) 1839 break; 1840 1841 for (bp = blist; bp; bp = nbp) { 1842 nbp = LIST_NEXT(bp, b_vnbufs); 1843 if (flags & V_SAVEMETA && bp->b_lblkno < 0) 1844 continue; 1845 if (bp->b_flags & B_BUSY) { 1846 bp->b_flags |= B_WANTED; 1847 error = tsleep(bp, slpflag | (PRIBIO + 1), 1848 "vinvalbuf", slptimeo); 1849 if (error) { 1850 splx(s); 1851 return (error); 1852 } 1853 break; 1854 } 1855 bremfree(bp); 1856 /* 1857 * XXX Since there are no node locks for NFS, I believe 1858 * there is a slight chance that a delayed write will 1859 * occur while sleeping just above, so check for it. 1860 */ 1861 if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) { 1862 buf_acquire(bp); 1863 splx(s); 1864 (void) VOP_BWRITE(bp); 1865 goto loop; 1866 } 1867 buf_acquire_nomap(bp); 1868 bp->b_flags |= B_INVAL; 1869 brelse(bp); 1870 } 1871 } 1872 if (!(flags & V_SAVEMETA) && 1873 (!LIST_EMPTY(&vp->v_dirtyblkhd) || !LIST_EMPTY(&vp->v_cleanblkhd))) 1874 panic("vinvalbuf: flush failed"); 1875 splx(s); 1876 return (0); 1877 } 1878 1879 void 1880 vflushbuf(struct vnode *vp, int sync) 1881 { 1882 struct buf *bp, *nbp; 1883 int s; 1884 1885 loop: 1886 s = splbio(); 1887 LIST_FOREACH_SAFE(bp, &vp->v_dirtyblkhd, b_vnbufs, nbp) { 1888 if ((bp->b_flags & B_BUSY)) 1889 continue; 1890 if ((bp->b_flags & B_DELWRI) == 0) 1891 panic("vflushbuf: not dirty"); 1892 bremfree(bp); 1893 buf_acquire(bp); 1894 splx(s); 1895 /* 1896 * Wait for I/O associated with indirect blocks to complete, 1897 * since there is no way to quickly wait for them below. 1898 */ 1899 if (bp->b_vp == vp || sync == 0) 1900 (void) bawrite(bp); 1901 else 1902 (void) bwrite(bp); 1903 goto loop; 1904 } 1905 if (sync == 0) { 1906 splx(s); 1907 return; 1908 } 1909 vwaitforio(vp, 0, "vflushbuf", 0); 1910 if (!LIST_EMPTY(&vp->v_dirtyblkhd)) { 1911 splx(s); 1912 #ifdef DIAGNOSTIC 1913 vprint("vflushbuf: dirty", vp); 1914 #endif 1915 goto loop; 1916 } 1917 splx(s); 1918 } 1919 1920 /* 1921 * Associate a buffer with a vnode. 1922 * 1923 * Manipulates buffer vnode queues. Must be called at splbio(). 1924 */ 1925 void 1926 bgetvp(struct vnode *vp, struct buf *bp) 1927 { 1928 splassert(IPL_BIO); 1929 1930 1931 if (bp->b_vp) 1932 panic("bgetvp: not free"); 1933 vhold(vp); 1934 bp->b_vp = vp; 1935 if (vp->v_type == VBLK || vp->v_type == VCHR) 1936 bp->b_dev = vp->v_rdev; 1937 else 1938 bp->b_dev = NODEV; 1939 /* 1940 * Insert onto list for new vnode. 1941 */ 1942 bufinsvn(bp, &vp->v_cleanblkhd); 1943 } 1944 1945 /* 1946 * Disassociate a buffer from a vnode. 1947 * 1948 * Manipulates vnode buffer queues. Must be called at splbio(). 1949 */ 1950 void 1951 brelvp(struct buf *bp) 1952 { 1953 struct vnode *vp; 1954 1955 splassert(IPL_BIO); 1956 1957 if ((vp = bp->b_vp) == (struct vnode *) 0) 1958 panic("brelvp: NULL"); 1959 /* 1960 * Delete from old vnode list, if on one. 1961 */ 1962 if (LIST_NEXT(bp, b_vnbufs) != NOLIST) 1963 bufremvn(bp); 1964 if ((vp->v_bioflag & VBIOONSYNCLIST) && 1965 LIST_FIRST(&vp->v_dirtyblkhd) == NULL) { 1966 vp->v_bioflag &= ~VBIOONSYNCLIST; 1967 LIST_REMOVE(vp, v_synclist); 1968 } 1969 bp->b_vp = NULL; 1970 1971 vdrop(vp); 1972 } 1973 1974 /* 1975 * Replaces the current vnode associated with the buffer, if any, 1976 * with a new vnode. 1977 * 1978 * If an output I/O is pending on the buffer, the old vnode 1979 * I/O count is adjusted. 1980 * 1981 * Ignores vnode buffer queues. Must be called at splbio(). 1982 */ 1983 void 1984 buf_replacevnode(struct buf *bp, struct vnode *newvp) 1985 { 1986 struct vnode *oldvp = bp->b_vp; 1987 1988 splassert(IPL_BIO); 1989 1990 if (oldvp) 1991 brelvp(bp); 1992 1993 if ((bp->b_flags & (B_READ | B_DONE)) == 0) { 1994 newvp->v_numoutput++; /* put it on swapdev */ 1995 vwakeup(oldvp); 1996 } 1997 1998 bgetvp(newvp, bp); 1999 bufremvn(bp); 2000 } 2001 2002 /* 2003 * Used to assign buffers to the appropriate clean or dirty list on 2004 * the vnode and to add newly dirty vnodes to the appropriate 2005 * filesystem syncer list. 2006 * 2007 * Manipulates vnode buffer queues. Must be called at splbio(). 2008 */ 2009 void 2010 reassignbuf(struct buf *bp) 2011 { 2012 struct buflists *listheadp; 2013 int delay; 2014 struct vnode *vp = bp->b_vp; 2015 2016 splassert(IPL_BIO); 2017 2018 /* 2019 * Delete from old vnode list, if on one. 2020 */ 2021 if (LIST_NEXT(bp, b_vnbufs) != NOLIST) 2022 bufremvn(bp); 2023 2024 /* 2025 * If dirty, put on list of dirty buffers; 2026 * otherwise insert onto list of clean buffers. 2027 */ 2028 if ((bp->b_flags & B_DELWRI) == 0) { 2029 listheadp = &vp->v_cleanblkhd; 2030 if ((vp->v_bioflag & VBIOONSYNCLIST) && 2031 LIST_FIRST(&vp->v_dirtyblkhd) == NULL) { 2032 vp->v_bioflag &= ~VBIOONSYNCLIST; 2033 LIST_REMOVE(vp, v_synclist); 2034 } 2035 } else { 2036 listheadp = &vp->v_dirtyblkhd; 2037 if ((vp->v_bioflag & VBIOONSYNCLIST) == 0) { 2038 switch (vp->v_type) { 2039 case VDIR: 2040 delay = syncdelay / 2; 2041 break; 2042 case VBLK: 2043 if (vp->v_specmountpoint != NULL) { 2044 delay = syncdelay / 3; 2045 break; 2046 } 2047 /* FALLTHROUGH */ 2048 default: 2049 delay = syncdelay; 2050 } 2051 vn_syncer_add_to_worklist(vp, delay); 2052 } 2053 } 2054 bufinsvn(bp, listheadp); 2055 } 2056 2057 int 2058 vfs_register(struct vfsconf *vfs) 2059 { 2060 struct vfsconf *vfsp; 2061 struct vfsconf **vfspp; 2062 2063 #ifdef DIAGNOSTIC 2064 /* Paranoia? */ 2065 if (vfs->vfc_refcount != 0) 2066 printf("vfs_register called with vfc_refcount > 0\n"); 2067 #endif 2068 2069 /* Check if filesystem already known */ 2070 for (vfspp = &vfsconf, vfsp = vfsconf; vfsp; 2071 vfspp = &vfsp->vfc_next, vfsp = vfsp->vfc_next) 2072 if (strcmp(vfsp->vfc_name, vfs->vfc_name) == 0) 2073 return (EEXIST); 2074 2075 if (vfs->vfc_typenum > maxvfsconf) 2076 maxvfsconf = vfs->vfc_typenum; 2077 2078 vfs->vfc_next = NULL; 2079 2080 /* Add to the end of the list */ 2081 *vfspp = vfs; 2082 2083 /* Call vfs_init() */ 2084 if (vfs->vfc_vfsops->vfs_init) 2085 (*(vfs->vfc_vfsops->vfs_init))(vfs); 2086 2087 return 0; 2088 } 2089 2090 int 2091 vfs_unregister(struct vfsconf *vfs) 2092 { 2093 struct vfsconf *vfsp; 2094 struct vfsconf **vfspp; 2095 int maxtypenum; 2096 2097 /* Find our vfsconf struct */ 2098 for (vfspp = &vfsconf, vfsp = vfsconf; vfsp; 2099 vfspp = &vfsp->vfc_next, vfsp = vfsp->vfc_next) { 2100 if (strcmp(vfsp->vfc_name, vfs->vfc_name) == 0) 2101 break; 2102 } 2103 2104 if (!vfsp) /* Not found */ 2105 return (ENOENT); 2106 2107 if (vfsp->vfc_refcount) /* In use */ 2108 return (EBUSY); 2109 2110 /* Remove from list and free */ 2111 *vfspp = vfsp->vfc_next; 2112 2113 maxtypenum = 0; 2114 2115 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 2116 if (vfsp->vfc_typenum > maxtypenum) 2117 maxtypenum = vfsp->vfc_typenum; 2118 2119 maxvfsconf = maxtypenum; 2120 return 0; 2121 } 2122 2123 /* 2124 * Check if vnode represents a disk device 2125 */ 2126 int 2127 vn_isdisk(struct vnode *vp, int *errp) 2128 { 2129 if (vp->v_type != VBLK && vp->v_type != VCHR) 2130 return (0); 2131 2132 return (1); 2133 } 2134 2135 #ifdef DDB 2136 #include <machine/db_machdep.h> 2137 #include <ddb/db_interface.h> 2138 2139 void 2140 vfs_buf_print(void *b, int full, 2141 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2142 { 2143 struct buf *bp = b; 2144 2145 (*pr)(" vp %p lblkno 0x%llx blkno 0x%llx dev 0x%x\n" 2146 " proc %p error %d flags %lb\n", 2147 bp->b_vp, (int64_t)bp->b_lblkno, (int64_t)bp->b_blkno, bp->b_dev, 2148 bp->b_proc, bp->b_error, bp->b_flags, B_BITS); 2149 2150 (*pr)(" bufsize 0x%lx bcount 0x%lx resid 0x%lx\n" 2151 " data %p saveaddr %p dep %p iodone %p\n", 2152 bp->b_bufsize, bp->b_bcount, (long)bp->b_resid, 2153 bp->b_data, bp->b_saveaddr, 2154 LIST_FIRST(&bp->b_dep), bp->b_iodone); 2155 2156 (*pr)(" dirty {off 0x%x end 0x%x} valid {off 0x%x end 0x%x}\n", 2157 bp->b_dirtyoff, bp->b_dirtyend, bp->b_validoff, bp->b_validend); 2158 2159 #ifdef FFS_SOFTUPDATES 2160 if (full) 2161 softdep_print(bp, full, pr); 2162 #endif 2163 } 2164 2165 const char *vtypes[] = { VTYPE_NAMES }; 2166 const char *vtags[] = { VTAG_NAMES }; 2167 2168 void 2169 vfs_vnode_print(void *v, int full, 2170 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2171 { 2172 struct vnode *vp = v; 2173 2174 (*pr)("tag %s(%d) type %s(%d) mount %p typedata %p\n", 2175 (u_int)vp->v_tag >= nitems(vtags)? "<unk>":vtags[vp->v_tag], 2176 vp->v_tag, 2177 (u_int)vp->v_type >= nitems(vtypes)? "<unk>":vtypes[vp->v_type], 2178 vp->v_type, vp->v_mount, vp->v_mountedhere); 2179 2180 (*pr)("data %p usecount %d writecount %d holdcnt %d numoutput %d\n", 2181 vp->v_data, vp->v_usecount, vp->v_writecount, 2182 vp->v_holdcnt, vp->v_numoutput); 2183 2184 /* uvm_object_printit(&vp->v_uobj, full, pr); */ 2185 2186 if (full) { 2187 struct buf *bp; 2188 2189 (*pr)("clean bufs:\n"); 2190 LIST_FOREACH(bp, &vp->v_cleanblkhd, b_vnbufs) { 2191 (*pr)(" bp %p\n", bp); 2192 vfs_buf_print(bp, full, pr); 2193 } 2194 2195 (*pr)("dirty bufs:\n"); 2196 LIST_FOREACH(bp, &vp->v_dirtyblkhd, b_vnbufs) { 2197 (*pr)(" bp %p\n", bp); 2198 vfs_buf_print(bp, full, pr); 2199 } 2200 } 2201 } 2202 2203 void 2204 vfs_mount_print(struct mount *mp, int full, 2205 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2206 { 2207 struct vfsconf *vfc = mp->mnt_vfc; 2208 struct vnode *vp; 2209 int cnt = 0; 2210 2211 (*pr)("flags %b\nvnodecovered %p syncer %p data %p\n", 2212 mp->mnt_flag, MNT_BITS, 2213 mp->mnt_vnodecovered, mp->mnt_syncer, mp->mnt_data); 2214 2215 (*pr)("vfsconf: ops %p name \"%s\" num %d ref %d flags 0x%x\n", 2216 vfc->vfc_vfsops, vfc->vfc_name, vfc->vfc_typenum, 2217 vfc->vfc_refcount, vfc->vfc_flags); 2218 2219 (*pr)("statvfs cache: bsize %x iosize %x\nblocks %llu free %llu avail %lld\n", 2220 mp->mnt_stat.f_bsize, mp->mnt_stat.f_iosize, mp->mnt_stat.f_blocks, 2221 mp->mnt_stat.f_bfree, mp->mnt_stat.f_bavail); 2222 2223 (*pr)(" files %llu ffiles %llu favail %lld\n", mp->mnt_stat.f_files, 2224 mp->mnt_stat.f_ffree, mp->mnt_stat.f_favail); 2225 2226 (*pr)(" f_fsidx {0x%x, 0x%x} owner %u ctime 0x%llx\n", 2227 mp->mnt_stat.f_fsid.val[0], mp->mnt_stat.f_fsid.val[1], 2228 mp->mnt_stat.f_owner, mp->mnt_stat.f_ctime); 2229 2230 (*pr)(" syncwrites %llu asyncwrites = %llu\n", 2231 mp->mnt_stat.f_syncwrites, mp->mnt_stat.f_asyncwrites); 2232 2233 (*pr)(" syncreads %llu asyncreads = %llu\n", 2234 mp->mnt_stat.f_syncreads, mp->mnt_stat.f_asyncreads); 2235 2236 (*pr)(" fstype \"%s\" mnton \"%s\" mntfrom \"%s\" mntspec \"%s\"\n", 2237 mp->mnt_stat.f_fstypename, mp->mnt_stat.f_mntonname, 2238 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntfromspec); 2239 2240 (*pr)("locked vnodes:"); 2241 /* XXX would take mountlist lock, except ddb has no context */ 2242 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) 2243 if (VOP_ISLOCKED(vp)) { 2244 if (!LIST_NEXT(vp, v_mntvnodes)) 2245 (*pr)(" %p", vp); 2246 else if (!(cnt++ % (72 / (sizeof(void *) * 2 + 4)))) 2247 (*pr)("\n\t%p", vp); 2248 else 2249 (*pr)(", %p", vp); 2250 } 2251 (*pr)("\n"); 2252 2253 if (full) { 2254 (*pr)("all vnodes:\n\t"); 2255 /* XXX would take mountlist lock, except ddb has no context */ 2256 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) 2257 if (!LIST_NEXT(vp, v_mntvnodes)) 2258 (*pr)(" %p", vp); 2259 else if (!(cnt++ % (72 / (sizeof(void *) * 2 + 4)))) 2260 (*pr)(" %p,\n\t", vp); 2261 else 2262 (*pr)(" %p,", vp); 2263 (*pr)("\n"); 2264 } 2265 } 2266 #endif /* DDB */ 2267 2268 void 2269 copy_statfs_info(struct statfs *sbp, const struct mount *mp) 2270 { 2271 const struct statfs *mbp; 2272 2273 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 2274 2275 if (sbp == (mbp = &mp->mnt_stat)) 2276 return; 2277 2278 sbp->f_fsid = mbp->f_fsid; 2279 sbp->f_owner = mbp->f_owner; 2280 sbp->f_flags = mbp->f_flags; 2281 sbp->f_syncwrites = mbp->f_syncwrites; 2282 sbp->f_asyncwrites = mbp->f_asyncwrites; 2283 sbp->f_syncreads = mbp->f_syncreads; 2284 sbp->f_asyncreads = mbp->f_asyncreads; 2285 sbp->f_namemax = mbp->f_namemax; 2286 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 2287 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 2288 memcpy(sbp->f_mntfromspec, mp->mnt_stat.f_mntfromspec, MNAMELEN); 2289 memcpy(&sbp->mount_info, &mp->mnt_stat.mount_info, 2290 sizeof(union mount_info)); 2291 } 2292