1 /* $OpenBSD: vfs_subr.c,v 1.285 2019/01/21 18:09:21 anton 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/lockf.h> 56 #include <sys/stat.h> 57 #include <sys/acct.h> 58 #include <sys/namei.h> 59 #include <sys/ucred.h> 60 #include <sys/buf.h> 61 #include <sys/errno.h> 62 #include <sys/malloc.h> 63 #include <sys/mbuf.h> 64 #include <sys/syscallargs.h> 65 #include <sys/pool.h> 66 #include <sys/tree.h> 67 #include <sys/specdev.h> 68 #include <sys/atomic.h> 69 70 #include <netinet/in.h> 71 72 #include <uvm/uvm_extern.h> 73 #include <uvm/uvm_vnode.h> 74 75 #include "softraid.h" 76 77 void sr_quiesce(void); 78 79 enum vtype iftovt_tab[16] = { 80 VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, 81 VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, 82 }; 83 84 int vttoif_tab[9] = { 85 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, 86 S_IFSOCK, S_IFIFO, S_IFMT, 87 }; 88 89 int prtactive = 0; /* 1 => print out reclaim of active vnodes */ 90 int suid_clear = 1; /* 1 => clear SUID / SGID on owner change */ 91 92 /* 93 * Insq/Remq for the vnode usage lists. 94 */ 95 #define bufinsvn(bp, dp) LIST_INSERT_HEAD(dp, bp, b_vnbufs) 96 #define bufremvn(bp) { \ 97 LIST_REMOVE(bp, b_vnbufs); \ 98 LIST_NEXT(bp, b_vnbufs) = NOLIST; \ 99 } 100 101 struct freelst vnode_hold_list; /* list of vnodes referencing buffers */ 102 struct freelst vnode_free_list; /* vnode free list */ 103 104 struct mntlist mountlist; /* mounted filesystem list */ 105 106 void vclean(struct vnode *, int, struct proc *); 107 108 void insmntque(struct vnode *, struct mount *); 109 int getdevvp(dev_t, struct vnode **, enum vtype); 110 111 int vfs_hang_addrlist(struct mount *, struct netexport *, 112 struct export_args *); 113 int vfs_free_netcred(struct radix_node *, void *, u_int); 114 void vfs_free_addrlist(struct netexport *); 115 void vputonfreelist(struct vnode *); 116 117 int vflush_vnode(struct vnode *, void *); 118 int maxvnodes; 119 120 void vfs_unmountall(void); 121 122 #ifdef DEBUG 123 void printlockedvnodes(void); 124 #endif 125 126 struct pool vnode_pool; 127 struct pool uvm_vnode_pool; 128 129 static inline int rb_buf_compare(const struct buf *b1, const struct buf *b2); 130 RBT_GENERATE(buf_rb_bufs, buf, b_rbbufs, rb_buf_compare); 131 132 static inline int 133 rb_buf_compare(const struct buf *b1, const struct buf *b2) 134 { 135 if (b1->b_lblkno < b2->b_lblkno) 136 return(-1); 137 if (b1->b_lblkno > b2->b_lblkno) 138 return(1); 139 return(0); 140 } 141 142 /* 143 * Initialize the vnode management data structures. 144 */ 145 void 146 vntblinit(void) 147 { 148 /* buffer cache may need a vnode for each buffer */ 149 maxvnodes = 2 * initialvnodes; 150 pool_init(&vnode_pool, sizeof(struct vnode), 0, IPL_NONE, 151 PR_WAITOK, "vnodes", NULL); 152 pool_init(&uvm_vnode_pool, sizeof(struct uvm_vnode), 0, IPL_NONE, 153 PR_WAITOK, "uvmvnodes", NULL); 154 TAILQ_INIT(&vnode_hold_list); 155 TAILQ_INIT(&vnode_free_list); 156 TAILQ_INIT(&mountlist); 157 /* 158 * Initialize the filesystem syncer. 159 */ 160 vn_initialize_syncerd(); 161 162 #ifdef NFSSERVER 163 rn_init(sizeof(struct sockaddr_in)); 164 #endif /* NFSSERVER */ 165 } 166 167 /* 168 * Allocate a mount point. 169 * 170 * The returned mount point is marked as busy. 171 */ 172 struct mount * 173 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp) 174 { 175 struct mount *mp; 176 177 mp = malloc(sizeof(*mp), M_MOUNT, M_WAITOK|M_ZERO); 178 rw_init_flags(&mp->mnt_lock, "vfslock", RWL_IS_VNODE); 179 (void)vfs_busy(mp, VB_READ|VB_NOWAIT); 180 181 LIST_INIT(&mp->mnt_vnodelist); 182 mp->mnt_vnodecovered = vp; 183 184 atomic_inc_int(&vfsp->vfc_refcount); 185 mp->mnt_vfc = vfsp; 186 mp->mnt_op = vfsp->vfc_vfsops; 187 mp->mnt_flag = vfsp->vfc_flags & MNT_VISFLAGMASK; 188 strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 189 190 return (mp); 191 } 192 193 /* 194 * Release a mount point. 195 */ 196 void 197 vfs_mount_free(struct mount *mp) 198 { 199 atomic_dec_int(&mp->mnt_vfc->vfc_refcount); 200 free(mp, M_MOUNT, sizeof(*mp)); 201 } 202 203 /* 204 * Mark a mount point as busy. Used to synchronize access and to delay 205 * unmounting. 206 * 207 * Default behaviour is to attempt getting a READ lock and in case of an 208 * ongoing unmount, to wait for it to finish and then return failure. 209 */ 210 int 211 vfs_busy(struct mount *mp, int flags) 212 { 213 int rwflags = 0; 214 215 if (flags & VB_WRITE) 216 rwflags |= RW_WRITE; 217 else 218 rwflags |= RW_READ; 219 220 if (flags & VB_WAIT) 221 rwflags |= RW_SLEEPFAIL; 222 else 223 rwflags |= RW_NOSLEEP; 224 225 #ifdef WITNESS 226 if (flags & VB_DUPOK) 227 rwflags |= RW_DUPOK; 228 #endif 229 230 if (rw_enter(&mp->mnt_lock, rwflags)) 231 return (EBUSY); 232 233 return (0); 234 } 235 236 /* 237 * Free a busy file system 238 */ 239 void 240 vfs_unbusy(struct mount *mp) 241 { 242 rw_exit(&mp->mnt_lock); 243 } 244 245 int 246 vfs_isbusy(struct mount *mp) 247 { 248 if (RWLOCK_OWNER(&mp->mnt_lock) > 0) 249 return (1); 250 else 251 return (0); 252 } 253 254 /* 255 * Lookup a filesystem type, and if found allocate and initialize 256 * a mount structure for it. 257 * 258 * Devname is usually updated by mount(8) after booting. 259 */ 260 int 261 vfs_rootmountalloc(char *fstypename, char *devname, struct mount **mpp) 262 { 263 struct vfsconf *vfsp; 264 struct mount *mp; 265 266 vfsp = vfs_byname(fstypename); 267 if (vfsp == NULL) 268 return (ENODEV); 269 mp = vfs_mount_alloc(NULLVP, vfsp); 270 mp->mnt_flag |= MNT_RDONLY; 271 mp->mnt_stat.f_mntonname[0] = '/'; 272 copystr(devname, mp->mnt_stat.f_mntfromname, MNAMELEN, 0); 273 copystr(devname, mp->mnt_stat.f_mntfromspec, MNAMELEN, 0); 274 *mpp = mp; 275 return (0); 276 } 277 278 /* 279 * Lookup a mount point by filesystem identifier. 280 */ 281 struct mount * 282 vfs_getvfs(fsid_t *fsid) 283 { 284 struct mount *mp; 285 286 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 287 if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && 288 mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { 289 return (mp); 290 } 291 } 292 293 return (NULL); 294 } 295 296 297 /* 298 * Get a new unique fsid 299 */ 300 void 301 vfs_getnewfsid(struct mount *mp) 302 { 303 static u_short xxxfs_mntid; 304 305 fsid_t tfsid; 306 int mtype; 307 308 mtype = mp->mnt_vfc->vfc_typenum; 309 mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + mtype, 0); 310 mp->mnt_stat.f_fsid.val[1] = mtype; 311 if (xxxfs_mntid == 0) 312 ++xxxfs_mntid; 313 tfsid.val[0] = makedev(nblkdev + mtype, xxxfs_mntid); 314 tfsid.val[1] = mtype; 315 if (!TAILQ_EMPTY(&mountlist)) { 316 while (vfs_getvfs(&tfsid)) { 317 tfsid.val[0]++; 318 xxxfs_mntid++; 319 } 320 } 321 mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; 322 } 323 324 /* 325 * Set vnode attributes to VNOVAL 326 */ 327 void 328 vattr_null(struct vattr *vap) 329 { 330 331 vap->va_type = VNON; 332 /* 333 * Don't get fancy: u_quad_t = u_int = VNOVAL leaves the u_quad_t 334 * with 2^31-1 instead of 2^64-1. Just write'm out and let 335 * the compiler do its job. 336 */ 337 vap->va_mode = VNOVAL; 338 vap->va_nlink = VNOVAL; 339 vap->va_uid = VNOVAL; 340 vap->va_gid = VNOVAL; 341 vap->va_fsid = VNOVAL; 342 vap->va_fileid = VNOVAL; 343 vap->va_size = VNOVAL; 344 vap->va_blocksize = VNOVAL; 345 vap->va_atime.tv_sec = VNOVAL; 346 vap->va_atime.tv_nsec = VNOVAL; 347 vap->va_mtime.tv_sec = VNOVAL; 348 vap->va_mtime.tv_nsec = VNOVAL; 349 vap->va_ctime.tv_sec = VNOVAL; 350 vap->va_ctime.tv_nsec = VNOVAL; 351 vap->va_gen = VNOVAL; 352 vap->va_flags = VNOVAL; 353 vap->va_rdev = VNOVAL; 354 vap->va_bytes = VNOVAL; 355 vap->va_filerev = VNOVAL; 356 vap->va_vaflags = 0; 357 } 358 359 /* 360 * Routines having to do with the management of the vnode table. 361 */ 362 long numvnodes; 363 364 /* 365 * Return the next vnode from the free list. 366 */ 367 int 368 getnewvnode(enum vtagtype tag, struct mount *mp, struct vops *vops, 369 struct vnode **vpp) 370 { 371 struct proc *p = curproc; 372 struct freelst *listhd; 373 static int toggle; 374 struct vnode *vp; 375 int s; 376 377 /* 378 * allow maxvnodes to increase if the buffer cache itself 379 * is big enough to justify it. (we don't shrink it ever) 380 */ 381 maxvnodes = maxvnodes < bcstats.numbufs ? bcstats.numbufs 382 : maxvnodes; 383 384 /* 385 * We must choose whether to allocate a new vnode or recycle an 386 * existing one. The criterion for allocating a new one is that 387 * the total number of vnodes is less than the number desired or 388 * there are no vnodes on either free list. Generally we only 389 * want to recycle vnodes that have no buffers associated with 390 * them, so we look first on the vnode_free_list. If it is empty, 391 * we next consider vnodes with referencing buffers on the 392 * vnode_hold_list. The toggle ensures that half the time we 393 * will use a buffer from the vnode_hold_list, and half the time 394 * we will allocate a new one unless the list has grown to twice 395 * the desired size. We are reticent to recycle vnodes from the 396 * vnode_hold_list because we will lose the identity of all its 397 * referencing buffers. 398 */ 399 toggle ^= 1; 400 if (numvnodes / 2 > maxvnodes) 401 toggle = 0; 402 403 s = splbio(); 404 if ((numvnodes < maxvnodes) || 405 ((TAILQ_FIRST(listhd = &vnode_free_list) == NULL) && 406 ((TAILQ_FIRST(listhd = &vnode_hold_list) == NULL) || toggle))) { 407 splx(s); 408 vp = pool_get(&vnode_pool, PR_WAITOK | PR_ZERO); 409 vp->v_uvm = pool_get(&uvm_vnode_pool, PR_WAITOK | PR_ZERO); 410 vp->v_uvm->u_vnode = vp; 411 RBT_INIT(buf_rb_bufs, &vp->v_bufs_tree); 412 cache_tree_init(&vp->v_nc_tree); 413 TAILQ_INIT(&vp->v_cache_dst); 414 numvnodes++; 415 } else { 416 TAILQ_FOREACH(vp, listhd, v_freelist) { 417 if (VOP_ISLOCKED(vp) == 0) 418 break; 419 } 420 /* 421 * Unless this is a bad time of the month, at most 422 * the first NCPUS items on the free list are 423 * locked, so this is close enough to being empty. 424 */ 425 if (vp == NULL) { 426 splx(s); 427 tablefull("vnode"); 428 *vpp = 0; 429 return (ENFILE); 430 } 431 432 #ifdef DIAGNOSTIC 433 if (vp->v_usecount) { 434 vprint("free vnode", vp); 435 panic("free vnode isn't"); 436 } 437 #endif 438 439 TAILQ_REMOVE(listhd, vp, v_freelist); 440 vp->v_bioflag &= ~VBIOONFREELIST; 441 splx(s); 442 443 if (vp->v_type != VBAD) 444 vgonel(vp, p); 445 #ifdef DIAGNOSTIC 446 if (vp->v_data) { 447 vprint("cleaned vnode", vp); 448 panic("cleaned vnode isn't"); 449 } 450 s = splbio(); 451 if (vp->v_numoutput) 452 panic("Clean vnode has pending I/O's"); 453 splx(s); 454 #endif 455 vp->v_flag = 0; 456 vp->v_socket = 0; 457 } 458 cache_purge(vp); 459 vp->v_type = VNON; 460 vp->v_tag = tag; 461 vp->v_op = vops; 462 insmntque(vp, mp); 463 *vpp = vp; 464 vp->v_usecount = 1; 465 vp->v_data = 0; 466 return (0); 467 } 468 469 /* 470 * Move a vnode from one mount queue to another. 471 */ 472 void 473 insmntque(struct vnode *vp, struct mount *mp) 474 { 475 /* 476 * Delete from old mount point vnode list, if on one. 477 */ 478 if (vp->v_mount != NULL) 479 LIST_REMOVE(vp, v_mntvnodes); 480 /* 481 * Insert into list of vnodes for the new mount point, if available. 482 */ 483 if ((vp->v_mount = mp) != NULL) 484 LIST_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes); 485 } 486 487 /* 488 * Create a vnode for a block device. 489 * Used for root filesystem, argdev, and swap areas. 490 * Also used for memory file system special devices. 491 */ 492 int 493 bdevvp(dev_t dev, struct vnode **vpp) 494 { 495 return (getdevvp(dev, vpp, VBLK)); 496 } 497 498 /* 499 * Create a vnode for a character device. 500 * Used for console handling. 501 */ 502 int 503 cdevvp(dev_t dev, struct vnode **vpp) 504 { 505 return (getdevvp(dev, vpp, VCHR)); 506 } 507 508 /* 509 * Create a vnode for a device. 510 * Used by bdevvp (block device) for root file system etc., 511 * and by cdevvp (character device) for console. 512 */ 513 int 514 getdevvp(dev_t dev, struct vnode **vpp, enum vtype type) 515 { 516 struct vnode *vp; 517 struct vnode *nvp; 518 int error; 519 520 if (dev == NODEV) { 521 *vpp = NULLVP; 522 return (0); 523 } 524 error = getnewvnode(VT_NON, NULL, &spec_vops, &nvp); 525 if (error) { 526 *vpp = NULLVP; 527 return (error); 528 } 529 vp = nvp; 530 vp->v_type = type; 531 if ((nvp = checkalias(vp, dev, NULL)) != 0) { 532 vput(vp); 533 vp = nvp; 534 } 535 if (vp->v_type == VCHR && cdevsw[major(vp->v_rdev)].d_type == D_TTY) 536 vp->v_flag |= VISTTY; 537 *vpp = vp; 538 return (0); 539 } 540 541 /* 542 * Check to see if the new vnode represents a special device 543 * for which we already have a vnode (either because of 544 * bdevvp() or because of a different vnode representing 545 * the same block device). If such an alias exists, deallocate 546 * the existing contents and return the aliased vnode. The 547 * caller is responsible for filling it with its new contents. 548 */ 549 struct vnode * 550 checkalias(struct vnode *nvp, dev_t nvp_rdev, struct mount *mp) 551 { 552 struct proc *p = curproc; 553 struct vnode *vp; 554 struct vnode **vpp; 555 556 if (nvp->v_type != VBLK && nvp->v_type != VCHR) 557 return (NULLVP); 558 559 vpp = &speclisth[SPECHASH(nvp_rdev)]; 560 loop: 561 for (vp = *vpp; vp; vp = vp->v_specnext) { 562 if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) { 563 continue; 564 } 565 /* 566 * Alias, but not in use, so flush it out. 567 */ 568 if (vp->v_usecount == 0) { 569 vgonel(vp, p); 570 goto loop; 571 } 572 if (vget(vp, LK_EXCLUSIVE)) { 573 goto loop; 574 } 575 break; 576 } 577 578 /* 579 * Common case is actually in the if statement 580 */ 581 if (vp == NULL || !(vp->v_tag == VT_NON && vp->v_type == VBLK)) { 582 nvp->v_specinfo = malloc(sizeof(struct specinfo), M_VNODE, 583 M_WAITOK); 584 nvp->v_rdev = nvp_rdev; 585 nvp->v_hashchain = vpp; 586 nvp->v_specnext = *vpp; 587 nvp->v_specmountpoint = NULL; 588 nvp->v_speclockf = NULL; 589 nvp->v_specbitmap = NULL; 590 if (nvp->v_type == VCHR && 591 (cdevsw[major(nvp_rdev)].d_flags & D_CLONE) && 592 (minor(nvp_rdev) >> CLONE_SHIFT == 0)) { 593 if (vp != NULLVP) 594 nvp->v_specbitmap = vp->v_specbitmap; 595 else 596 nvp->v_specbitmap = malloc(CLONE_MAPSZ, 597 M_VNODE, M_WAITOK | M_ZERO); 598 } 599 *vpp = nvp; 600 if (vp != NULLVP) { 601 nvp->v_flag |= VALIASED; 602 vp->v_flag |= VALIASED; 603 vput(vp); 604 } 605 return (NULLVP); 606 } 607 608 /* 609 * This code is the uncommon case. It is called in case 610 * we found an alias that was VT_NON && vtype of VBLK 611 * This means we found a block device that was created 612 * using bdevvp. 613 * An example of such a vnode is the root partition device vnode 614 * created in ffs_mountroot. 615 * 616 * The vnodes created by bdevvp should not be aliased (why?). 617 */ 618 619 VOP_UNLOCK(vp); 620 vclean(vp, 0, p); 621 vp->v_op = nvp->v_op; 622 vp->v_tag = nvp->v_tag; 623 nvp->v_type = VNON; 624 insmntque(vp, mp); 625 return (vp); 626 } 627 628 /* 629 * Grab a particular vnode from the free list, increment its 630 * reference count and lock it. If the vnode lock bit is set, 631 * the vnode is being eliminated in vgone. In that case, we 632 * cannot grab it, so the process is awakened when the 633 * transition is completed, and an error code is returned to 634 * indicate that the vnode is no longer usable, possibly 635 * having been changed to a new file system type. 636 */ 637 int 638 vget(struct vnode *vp, int flags) 639 { 640 int error, s, onfreelist; 641 642 /* 643 * If the vnode is in the process of being cleaned out for 644 * another use, we wait for the cleaning to finish and then 645 * return failure. Cleaning is determined by checking that 646 * the VXLOCK flag is set. 647 */ 648 649 if (vp->v_flag & VXLOCK) { 650 if (flags & LK_NOWAIT) { 651 return (EBUSY); 652 } 653 654 vp->v_flag |= VXWANT; 655 tsleep(vp, PINOD, "vget", 0); 656 return (ENOENT); 657 } 658 659 onfreelist = vp->v_bioflag & VBIOONFREELIST; 660 if (vp->v_usecount == 0 && onfreelist) { 661 s = splbio(); 662 if (vp->v_holdcnt > 0) 663 TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist); 664 else 665 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 666 vp->v_bioflag &= ~VBIOONFREELIST; 667 splx(s); 668 } 669 670 vp->v_usecount++; 671 if (flags & LK_TYPE_MASK) { 672 if ((error = vn_lock(vp, flags)) != 0) { 673 vp->v_usecount--; 674 if (vp->v_usecount == 0 && onfreelist) 675 vputonfreelist(vp); 676 } 677 return (error); 678 } 679 680 return (0); 681 } 682 683 684 /* Vnode reference. */ 685 void 686 vref(struct vnode *vp) 687 { 688 #ifdef DIAGNOSTIC 689 if (vp->v_usecount == 0) 690 panic("vref used where vget required"); 691 if (vp->v_type == VNON) 692 panic("vref on a VNON vnode"); 693 #endif 694 vp->v_usecount++; 695 } 696 697 void 698 vputonfreelist(struct vnode *vp) 699 { 700 int s; 701 struct freelst *lst; 702 703 s = splbio(); 704 #ifdef DIAGNOSTIC 705 if (vp->v_usecount != 0) 706 panic("Use count is not zero!"); 707 708 if (vp->v_bioflag & VBIOONFREELIST) { 709 vprint("vnode already on free list: ", vp); 710 panic("vnode already on free list"); 711 } 712 #endif 713 714 vp->v_bioflag |= VBIOONFREELIST; 715 716 if (vp->v_holdcnt > 0) 717 lst = &vnode_hold_list; 718 else 719 lst = &vnode_free_list; 720 721 if (vp->v_type == VBAD) 722 TAILQ_INSERT_HEAD(lst, vp, v_freelist); 723 else 724 TAILQ_INSERT_TAIL(lst, vp, v_freelist); 725 726 splx(s); 727 } 728 729 /* 730 * vput(), just unlock and vrele() 731 */ 732 void 733 vput(struct vnode *vp) 734 { 735 struct proc *p = curproc; 736 737 #ifdef DIAGNOSTIC 738 if (vp == NULL) 739 panic("vput: null vp"); 740 #endif 741 742 #ifdef DIAGNOSTIC 743 if (vp->v_usecount == 0) { 744 vprint("vput: bad ref count", vp); 745 panic("vput: ref cnt"); 746 } 747 #endif 748 vp->v_usecount--; 749 KASSERT(vp->v_usecount > 0 || vp->v_uvcount == 0); 750 if (vp->v_usecount > 0) { 751 VOP_UNLOCK(vp); 752 return; 753 } 754 755 #ifdef DIAGNOSTIC 756 if (vp->v_writecount != 0) { 757 vprint("vput: bad writecount", vp); 758 panic("vput: v_writecount != 0"); 759 } 760 #endif 761 762 VOP_INACTIVE(vp, p); 763 764 if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST)) 765 vputonfreelist(vp); 766 } 767 768 /* 769 * Vnode release - use for active VNODES. 770 * If count drops to zero, call inactive routine and return to freelist. 771 * Returns 0 if it did not sleep. 772 */ 773 int 774 vrele(struct vnode *vp) 775 { 776 struct proc *p = curproc; 777 778 #ifdef DIAGNOSTIC 779 if (vp == NULL) 780 panic("vrele: null vp"); 781 #endif 782 #ifdef DIAGNOSTIC 783 if (vp->v_usecount == 0) { 784 vprint("vrele: bad ref count", vp); 785 panic("vrele: ref cnt"); 786 } 787 #endif 788 vp->v_usecount--; 789 if (vp->v_usecount > 0) { 790 return (0); 791 } 792 793 #ifdef DIAGNOSTIC 794 if (vp->v_writecount != 0) { 795 vprint("vrele: bad writecount", vp); 796 panic("vrele: v_writecount != 0"); 797 } 798 #endif 799 800 if (vn_lock(vp, LK_EXCLUSIVE)) { 801 #ifdef DIAGNOSTIC 802 vprint("vrele: cannot lock", vp); 803 #endif 804 return (1); 805 } 806 807 VOP_INACTIVE(vp, p); 808 809 if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST)) 810 vputonfreelist(vp); 811 return (1); 812 } 813 814 /* Page or buffer structure gets a reference. */ 815 void 816 vhold(struct vnode *vp) 817 { 818 /* 819 * If it is on the freelist and the hold count is currently 820 * zero, move it to the hold list. 821 */ 822 if ((vp->v_bioflag & VBIOONFREELIST) && 823 vp->v_holdcnt == 0 && vp->v_usecount == 0) { 824 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 825 TAILQ_INSERT_TAIL(&vnode_hold_list, vp, v_freelist); 826 } 827 vp->v_holdcnt++; 828 } 829 830 /* Lose interest in a vnode. */ 831 void 832 vdrop(struct vnode *vp) 833 { 834 #ifdef DIAGNOSTIC 835 if (vp->v_holdcnt == 0) 836 panic("vdrop: zero holdcnt"); 837 #endif 838 839 vp->v_holdcnt--; 840 841 /* 842 * If it is on the holdlist and the hold count drops to 843 * zero, move it to the free list. 844 */ 845 if ((vp->v_bioflag & VBIOONFREELIST) && 846 vp->v_holdcnt == 0 && vp->v_usecount == 0) { 847 TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist); 848 TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); 849 } 850 } 851 852 /* 853 * Remove any vnodes in the vnode table belonging to mount point mp. 854 * 855 * If MNT_NOFORCE is specified, there should not be any active ones, 856 * return error if any are found (nb: this is a user error, not a 857 * system error). If MNT_FORCE is specified, detach any active vnodes 858 * that are found. 859 */ 860 #ifdef DEBUG 861 int busyprt = 0; /* print out busy vnodes */ 862 struct ctldebug debug1 = { "busyprt", &busyprt }; 863 #endif 864 865 int 866 vfs_mount_foreach_vnode(struct mount *mp, 867 int (*func)(struct vnode *, void *), void *arg) { 868 struct vnode *vp, *nvp; 869 int error = 0; 870 871 loop: 872 LIST_FOREACH_SAFE(vp , &mp->mnt_vnodelist, v_mntvnodes, nvp) { 873 if (vp->v_mount != mp) 874 goto loop; 875 876 error = func(vp, arg); 877 878 if (error != 0) 879 break; 880 } 881 882 return (error); 883 } 884 885 struct vflush_args { 886 struct vnode *skipvp; 887 int busy; 888 int flags; 889 }; 890 891 int 892 vflush_vnode(struct vnode *vp, void *arg) 893 { 894 struct vflush_args *va = arg; 895 struct proc *p = curproc; 896 897 if (vp == va->skipvp) { 898 return (0); 899 } 900 901 if ((va->flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) { 902 return (0); 903 } 904 905 /* 906 * If WRITECLOSE is set, only flush out regular file 907 * vnodes open for writing. 908 */ 909 if ((va->flags & WRITECLOSE) && 910 (vp->v_writecount == 0 || vp->v_type != VREG)) { 911 return (0); 912 } 913 914 /* 915 * With v_usecount == 0, all we need to do is clear 916 * out the vnode data structures and we are done. 917 */ 918 if (vp->v_usecount == 0) { 919 vgonel(vp, p); 920 return (0); 921 } 922 923 /* 924 * If FORCECLOSE is set, forcibly close the vnode. 925 * For block or character devices, revert to an 926 * anonymous device. For all other files, just kill them. 927 */ 928 if (va->flags & FORCECLOSE) { 929 if (vp->v_type != VBLK && vp->v_type != VCHR) { 930 vgonel(vp, p); 931 } else { 932 vclean(vp, 0, p); 933 vp->v_op = &spec_vops; 934 insmntque(vp, NULL); 935 } 936 return (0); 937 } 938 939 /* 940 * If set, this is allowed to ignore vnodes which don't 941 * have changes pending to disk. 942 * XXX Might be nice to check per-fs "inode" flags, but 943 * generally the filesystem is sync'd already, right? 944 */ 945 if ((va->flags & IGNORECLEAN) && 946 LIST_EMPTY(&vp->v_dirtyblkhd)) 947 return (0); 948 949 #ifdef DEBUG 950 if (busyprt) 951 vprint("vflush: busy vnode", vp); 952 #endif 953 va->busy++; 954 return (0); 955 } 956 957 int 958 vflush(struct mount *mp, struct vnode *skipvp, int flags) 959 { 960 struct vflush_args va; 961 va.skipvp = skipvp; 962 va.busy = 0; 963 va.flags = flags; 964 965 vfs_mount_foreach_vnode(mp, vflush_vnode, &va); 966 967 if (va.busy) 968 return (EBUSY); 969 return (0); 970 } 971 972 /* 973 * Disassociate the underlying file system from a vnode. 974 */ 975 void 976 vclean(struct vnode *vp, int flags, struct proc *p) 977 { 978 int active; 979 980 /* 981 * Check to see if the vnode is in use. 982 * If so we have to reference it before we clean it out 983 * so that its count cannot fall to zero and generate a 984 * race against ourselves to recycle it. 985 */ 986 if ((active = vp->v_usecount) != 0) 987 vp->v_usecount++; 988 989 /* 990 * Prevent the vnode from being recycled or 991 * brought into use while we clean it out. 992 */ 993 if (vp->v_flag & VXLOCK) 994 panic("vclean: deadlock"); 995 vp->v_flag |= VXLOCK; 996 /* 997 * Even if the count is zero, the VOP_INACTIVE routine may still 998 * have the object locked while it cleans it out. The VOP_LOCK 999 * ensures that the VOP_INACTIVE routine is done with its work. 1000 * For active vnodes, it ensures that no other activity can 1001 * occur while the underlying object is being cleaned out. 1002 */ 1003 VOP_LOCK(vp, LK_DRAIN | LK_EXCLUSIVE); 1004 1005 /* 1006 * Clean out any VM data associated with the vnode. 1007 */ 1008 uvm_vnp_terminate(vp); 1009 /* 1010 * Clean out any buffers associated with the vnode. 1011 */ 1012 if (flags & DOCLOSE) 1013 vinvalbuf(vp, V_SAVE, NOCRED, p, 0, 0); 1014 /* 1015 * If purging an active vnode, it must be closed and 1016 * deactivated before being reclaimed. Note that the 1017 * VOP_INACTIVE will unlock the vnode 1018 */ 1019 if (active) { 1020 if (flags & DOCLOSE) 1021 VOP_CLOSE(vp, FNONBLOCK, NOCRED, p); 1022 VOP_INACTIVE(vp, p); 1023 } else { 1024 /* 1025 * Any other processes trying to obtain this lock must first 1026 * wait for VXLOCK to clear, then call the new lock operation. 1027 */ 1028 VOP_UNLOCK(vp); 1029 } 1030 1031 /* 1032 * Reclaim the vnode. 1033 */ 1034 if (VOP_RECLAIM(vp, p)) 1035 panic("vclean: cannot reclaim"); 1036 if (active) { 1037 vp->v_usecount--; 1038 if (vp->v_usecount == 0) { 1039 if (vp->v_holdcnt > 0) 1040 panic("vclean: not clean"); 1041 vputonfreelist(vp); 1042 } 1043 } 1044 cache_purge(vp); 1045 1046 /* 1047 * Done with purge, notify sleepers of the grim news. 1048 */ 1049 vp->v_op = &dead_vops; 1050 VN_KNOTE(vp, NOTE_REVOKE); 1051 vp->v_tag = VT_NON; 1052 vp->v_flag &= ~VXLOCK; 1053 #ifdef VFSLCKDEBUG 1054 vp->v_flag &= ~VLOCKSWORK; 1055 #endif 1056 if (vp->v_flag & VXWANT) { 1057 vp->v_flag &= ~VXWANT; 1058 wakeup(vp); 1059 } 1060 } 1061 1062 /* 1063 * Recycle an unused vnode to the front of the free list. 1064 */ 1065 int 1066 vrecycle(struct vnode *vp, struct proc *p) 1067 { 1068 if (vp->v_usecount == 0) { 1069 vgonel(vp, p); 1070 return (1); 1071 } 1072 return (0); 1073 } 1074 1075 /* 1076 * Eliminate all activity associated with a vnode 1077 * in preparation for reuse. 1078 */ 1079 void 1080 vgone(struct vnode *vp) 1081 { 1082 struct proc *p = curproc; 1083 vgonel(vp, p); 1084 } 1085 1086 /* 1087 * vgone, with struct proc. 1088 */ 1089 void 1090 vgonel(struct vnode *vp, struct proc *p) 1091 { 1092 struct vnode *vq; 1093 struct vnode *vx; 1094 1095 KASSERT(vp->v_uvcount == 0); 1096 1097 /* 1098 * If a vgone (or vclean) is already in progress, 1099 * wait until it is done and return. 1100 */ 1101 if (vp->v_flag & VXLOCK) { 1102 vp->v_flag |= VXWANT; 1103 tsleep(vp, PINOD, "vgone", 0); 1104 return; 1105 } 1106 1107 /* 1108 * Clean out the filesystem specific data. 1109 */ 1110 vclean(vp, DOCLOSE, p); 1111 /* 1112 * Delete from old mount point vnode list, if on one. 1113 */ 1114 if (vp->v_mount != NULL) 1115 insmntque(vp, NULL); 1116 /* 1117 * If special device, remove it from special device alias list 1118 * if it is on one. 1119 */ 1120 if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_specinfo != 0) { 1121 if ((vp->v_flag & VALIASED) == 0 && vp->v_type == VCHR && 1122 (cdevsw[major(vp->v_rdev)].d_flags & D_CLONE) && 1123 (minor(vp->v_rdev) >> CLONE_SHIFT == 0)) { 1124 free(vp->v_specbitmap, M_VNODE, CLONE_MAPSZ); 1125 } 1126 if (*vp->v_hashchain == vp) { 1127 *vp->v_hashchain = vp->v_specnext; 1128 } else { 1129 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1130 if (vq->v_specnext != vp) 1131 continue; 1132 vq->v_specnext = vp->v_specnext; 1133 break; 1134 } 1135 if (vq == NULL) 1136 panic("missing bdev"); 1137 } 1138 if (vp->v_flag & VALIASED) { 1139 vx = NULL; 1140 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1141 if (vq->v_rdev != vp->v_rdev || 1142 vq->v_type != vp->v_type) 1143 continue; 1144 if (vx) 1145 break; 1146 vx = vq; 1147 } 1148 if (vx == NULL) 1149 panic("missing alias"); 1150 if (vq == NULL) 1151 vx->v_flag &= ~VALIASED; 1152 vp->v_flag &= ~VALIASED; 1153 } 1154 lf_purgelocks(vp->v_speclockf); 1155 free(vp->v_specinfo, M_VNODE, sizeof(struct specinfo)); 1156 vp->v_specinfo = NULL; 1157 } 1158 /* 1159 * If it is on the freelist and not already at the head, 1160 * move it to the head of the list. 1161 */ 1162 vp->v_type = VBAD; 1163 1164 /* 1165 * Move onto the free list, unless we were called from 1166 * getnewvnode and we're not on any free list 1167 */ 1168 if (vp->v_usecount == 0 && 1169 (vp->v_bioflag & VBIOONFREELIST)) { 1170 int s; 1171 1172 s = splbio(); 1173 1174 if (vp->v_holdcnt > 0) 1175 panic("vgonel: not clean"); 1176 1177 if (TAILQ_FIRST(&vnode_free_list) != vp) { 1178 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 1179 TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); 1180 } 1181 splx(s); 1182 } 1183 } 1184 1185 /* 1186 * Lookup a vnode by device number. 1187 */ 1188 int 1189 vfinddev(dev_t dev, enum vtype type, struct vnode **vpp) 1190 { 1191 struct vnode *vp; 1192 int rc =0; 1193 1194 for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { 1195 if (dev != vp->v_rdev || type != vp->v_type) 1196 continue; 1197 *vpp = vp; 1198 rc = 1; 1199 break; 1200 } 1201 return (rc); 1202 } 1203 1204 /* 1205 * Revoke all the vnodes corresponding to the specified minor number 1206 * range (endpoints inclusive) of the specified major. 1207 */ 1208 void 1209 vdevgone(int maj, int minl, int minh, enum vtype type) 1210 { 1211 struct vnode *vp; 1212 int mn; 1213 1214 for (mn = minl; mn <= minh; mn++) 1215 if (vfinddev(makedev(maj, mn), type, &vp)) 1216 VOP_REVOKE(vp, REVOKEALL); 1217 } 1218 1219 /* 1220 * Calculate the total number of references to a special device. 1221 */ 1222 int 1223 vcount(struct vnode *vp) 1224 { 1225 struct vnode *vq, *vnext; 1226 int count; 1227 1228 loop: 1229 if ((vp->v_flag & VALIASED) == 0) 1230 return (vp->v_usecount); 1231 for (count = 0, vq = *vp->v_hashchain; vq; vq = vnext) { 1232 vnext = vq->v_specnext; 1233 if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) 1234 continue; 1235 /* 1236 * Alias, but not in use, so flush it out. 1237 */ 1238 if (vq->v_usecount == 0 && vq != vp) { 1239 vgone(vq); 1240 goto loop; 1241 } 1242 count += vq->v_usecount; 1243 } 1244 return (count); 1245 } 1246 1247 #if defined(DEBUG) || defined(DIAGNOSTIC) 1248 /* 1249 * Print out a description of a vnode. 1250 */ 1251 static char *typename[] = 1252 { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; 1253 1254 void 1255 vprint(char *label, struct vnode *vp) 1256 { 1257 char buf[64]; 1258 1259 if (label != NULL) 1260 printf("%s: ", label); 1261 printf("%p, type %s, use %u, write %u, hold %u,", 1262 vp, typename[vp->v_type], vp->v_usecount, vp->v_writecount, 1263 vp->v_holdcnt); 1264 buf[0] = '\0'; 1265 if (vp->v_flag & VROOT) 1266 strlcat(buf, "|VROOT", sizeof buf); 1267 if (vp->v_flag & VTEXT) 1268 strlcat(buf, "|VTEXT", sizeof buf); 1269 if (vp->v_flag & VSYSTEM) 1270 strlcat(buf, "|VSYSTEM", sizeof buf); 1271 if (vp->v_flag & VXLOCK) 1272 strlcat(buf, "|VXLOCK", sizeof buf); 1273 if (vp->v_flag & VXWANT) 1274 strlcat(buf, "|VXWANT", sizeof buf); 1275 if (vp->v_bioflag & VBIOWAIT) 1276 strlcat(buf, "|VBIOWAIT", sizeof buf); 1277 if (vp->v_bioflag & VBIOONFREELIST) 1278 strlcat(buf, "|VBIOONFREELIST", sizeof buf); 1279 if (vp->v_bioflag & VBIOONSYNCLIST) 1280 strlcat(buf, "|VBIOONSYNCLIST", sizeof buf); 1281 if (vp->v_flag & VALIASED) 1282 strlcat(buf, "|VALIASED", sizeof buf); 1283 if (buf[0] != '\0') 1284 printf(" flags (%s)", &buf[1]); 1285 if (vp->v_data == NULL) { 1286 printf("\n"); 1287 } else { 1288 printf("\n\t"); 1289 VOP_PRINT(vp); 1290 } 1291 } 1292 #endif /* DEBUG || DIAGNOSTIC */ 1293 1294 #ifdef DEBUG 1295 /* 1296 * List all of the locked vnodes in the system. 1297 * Called when debugging the kernel. 1298 */ 1299 void 1300 printlockedvnodes(void) 1301 { 1302 struct mount *mp; 1303 struct vnode *vp; 1304 1305 printf("Locked vnodes\n"); 1306 1307 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 1308 if (vfs_busy(mp, VB_READ|VB_NOWAIT)) 1309 continue; 1310 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 1311 if (VOP_ISLOCKED(vp)) 1312 vprint(NULL, vp); 1313 } 1314 vfs_unbusy(mp); 1315 } 1316 1317 } 1318 #endif 1319 1320 /* 1321 * Top level filesystem related information gathering. 1322 */ 1323 int 1324 vfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 1325 size_t newlen, struct proc *p) 1326 { 1327 struct vfsconf *vfsp, *tmpvfsp; 1328 int ret; 1329 1330 /* all sysctl names at this level are at least name and field */ 1331 if (namelen < 2) 1332 return (ENOTDIR); /* overloaded */ 1333 1334 if (name[0] != VFS_GENERIC) { 1335 vfsp = vfs_bytypenum(name[0]); 1336 if (vfsp == NULL || vfsp->vfc_vfsops->vfs_sysctl == NULL) 1337 return (EOPNOTSUPP); 1338 1339 return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1, 1340 oldp, oldlenp, newp, newlen, p)); 1341 } 1342 1343 switch (name[1]) { 1344 case VFS_MAXTYPENUM: 1345 return (sysctl_rdint(oldp, oldlenp, newp, maxvfsconf)); 1346 1347 case VFS_CONF: 1348 if (namelen < 3) 1349 return (ENOTDIR); /* overloaded */ 1350 1351 vfsp = vfs_bytypenum(name[2]); 1352 if (vfsp == NULL) 1353 return (EOPNOTSUPP); 1354 1355 /* Make a copy, clear out kernel pointers */ 1356 tmpvfsp = malloc(sizeof(*tmpvfsp), M_TEMP, M_WAITOK|M_ZERO); 1357 memcpy(tmpvfsp, vfsp, sizeof(*tmpvfsp)); 1358 tmpvfsp->vfc_vfsops = NULL; 1359 1360 ret = sysctl_rdstruct(oldp, oldlenp, newp, tmpvfsp, 1361 sizeof(struct vfsconf)); 1362 1363 free(tmpvfsp, M_TEMP, sizeof(*tmpvfsp)); 1364 return (ret); 1365 case VFS_BCACHESTAT: /* buffer cache statistics */ 1366 ret = sysctl_rdstruct(oldp, oldlenp, newp, &bcstats, 1367 sizeof(struct bcachestats)); 1368 return(ret); 1369 } 1370 return (EOPNOTSUPP); 1371 } 1372 1373 /* 1374 * Check to see if a filesystem is mounted on a block device. 1375 */ 1376 int 1377 vfs_mountedon(struct vnode *vp) 1378 { 1379 struct vnode *vq; 1380 int error = 0; 1381 1382 if (vp->v_specmountpoint != NULL) 1383 return (EBUSY); 1384 if (vp->v_flag & VALIASED) { 1385 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1386 if (vq->v_rdev != vp->v_rdev || 1387 vq->v_type != vp->v_type) 1388 continue; 1389 if (vq->v_specmountpoint != NULL) { 1390 error = EBUSY; 1391 break; 1392 } 1393 } 1394 } 1395 return (error); 1396 } 1397 1398 #ifdef NFSSERVER 1399 /* 1400 * Build hash lists of net addresses and hang them off the mount point. 1401 * Called by vfs_export() to set up the lists of export addresses. 1402 */ 1403 int 1404 vfs_hang_addrlist(struct mount *mp, struct netexport *nep, 1405 struct export_args *argp) 1406 { 1407 struct netcred *np; 1408 struct radix_node_head *rnh; 1409 int nplen, i; 1410 struct radix_node *rn; 1411 struct sockaddr *saddr, *smask = 0; 1412 int error; 1413 1414 if (argp->ex_addrlen == 0) { 1415 if (mp->mnt_flag & MNT_DEFEXPORTED) 1416 return (EPERM); 1417 np = &nep->ne_defexported; 1418 /* fill in the kernel's ucred from userspace's xucred */ 1419 if ((error = crfromxucred(&np->netc_anon, &argp->ex_anon))) 1420 return (error); 1421 mp->mnt_flag |= MNT_DEFEXPORTED; 1422 goto finish; 1423 } 1424 if (argp->ex_addrlen > MLEN || argp->ex_masklen > MLEN || 1425 argp->ex_addrlen < 0 || argp->ex_masklen < 0) 1426 return (EINVAL); 1427 nplen = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; 1428 np = (struct netcred *)malloc(nplen, M_NETADDR, M_WAITOK|M_ZERO); 1429 np->netc_len = nplen; 1430 saddr = (struct sockaddr *)(np + 1); 1431 error = copyin(argp->ex_addr, saddr, argp->ex_addrlen); 1432 if (error) 1433 goto out; 1434 if (saddr->sa_len > argp->ex_addrlen) 1435 saddr->sa_len = argp->ex_addrlen; 1436 if (argp->ex_masklen) { 1437 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen); 1438 error = copyin(argp->ex_mask, smask, argp->ex_masklen); 1439 if (error) 1440 goto out; 1441 if (smask->sa_len > argp->ex_masklen) 1442 smask->sa_len = argp->ex_masklen; 1443 } 1444 /* fill in the kernel's ucred from userspace's xucred */ 1445 if ((error = crfromxucred(&np->netc_anon, &argp->ex_anon))) 1446 goto out; 1447 i = saddr->sa_family; 1448 switch (i) { 1449 case AF_INET: 1450 if ((rnh = nep->ne_rtable_inet) == NULL) { 1451 if (!rn_inithead((void **)&nep->ne_rtable_inet, 1452 offsetof(struct sockaddr_in, sin_addr))) { 1453 error = ENOBUFS; 1454 goto out; 1455 } 1456 rnh = nep->ne_rtable_inet; 1457 } 1458 break; 1459 default: 1460 error = EINVAL; 1461 goto out; 1462 } 1463 rn = rn_addroute(saddr, smask, rnh, np->netc_rnodes, 0); 1464 if (rn == 0 || np != (struct netcred *)rn) { /* already exists */ 1465 error = EPERM; 1466 goto out; 1467 } 1468 finish: 1469 np->netc_exflags = argp->ex_flags; 1470 return (0); 1471 out: 1472 free(np, M_NETADDR, np->netc_len); 1473 return (error); 1474 } 1475 1476 int 1477 vfs_free_netcred(struct radix_node *rn, void *w, u_int id) 1478 { 1479 struct radix_node_head *rnh = (struct radix_node_head *)w; 1480 struct netcred * np = (struct netcred *)rn; 1481 1482 rn_delete(rn->rn_key, rn->rn_mask, rnh, NULL); 1483 free(np, M_NETADDR, np->netc_len); 1484 return (0); 1485 } 1486 1487 /* 1488 * Free the net address hash lists that are hanging off the mount points. 1489 */ 1490 void 1491 vfs_free_addrlist(struct netexport *nep) 1492 { 1493 struct radix_node_head *rnh; 1494 1495 if ((rnh = nep->ne_rtable_inet) != NULL) { 1496 rn_walktree(rnh, vfs_free_netcred, rnh); 1497 free(rnh, M_RTABLE, sizeof(*rnh)); 1498 nep->ne_rtable_inet = NULL; 1499 } 1500 } 1501 #endif /* NFSSERVER */ 1502 1503 int 1504 vfs_export(struct mount *mp, struct netexport *nep, struct export_args *argp) 1505 { 1506 #ifdef NFSSERVER 1507 int error; 1508 1509 if (argp->ex_flags & MNT_DELEXPORT) { 1510 vfs_free_addrlist(nep); 1511 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 1512 } 1513 if (argp->ex_flags & MNT_EXPORTED) { 1514 if ((error = vfs_hang_addrlist(mp, nep, argp)) != 0) 1515 return (error); 1516 mp->mnt_flag |= MNT_EXPORTED; 1517 } 1518 return (0); 1519 #else 1520 return (ENOTSUP); 1521 #endif /* NFSSERVER */ 1522 } 1523 1524 struct netcred * 1525 vfs_export_lookup(struct mount *mp, struct netexport *nep, struct mbuf *nam) 1526 { 1527 #ifdef NFSSERVER 1528 struct netcred *np; 1529 struct radix_node_head *rnh; 1530 struct sockaddr *saddr; 1531 1532 np = NULL; 1533 if (mp->mnt_flag & MNT_EXPORTED) { 1534 /* 1535 * Lookup in the export list first. 1536 */ 1537 if (nam != NULL) { 1538 saddr = mtod(nam, struct sockaddr *); 1539 switch(saddr->sa_family) { 1540 case AF_INET: 1541 rnh = nep->ne_rtable_inet; 1542 break; 1543 default: 1544 rnh = NULL; 1545 break; 1546 } 1547 if (rnh != NULL) 1548 np = (struct netcred *)rn_match(saddr, rnh); 1549 } 1550 /* 1551 * If no address match, use the default if it exists. 1552 */ 1553 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED) 1554 np = &nep->ne_defexported; 1555 } 1556 return (np); 1557 #else 1558 return (NULL); 1559 #endif /* NFSSERVER */ 1560 } 1561 1562 /* 1563 * Do the usual access checking. 1564 * file_mode, uid and gid are from the vnode in question, 1565 * while acc_mode and cred are from the VOP_ACCESS parameter list 1566 */ 1567 int 1568 vaccess(enum vtype type, mode_t file_mode, uid_t uid, gid_t gid, 1569 mode_t acc_mode, struct ucred *cred) 1570 { 1571 mode_t mask; 1572 1573 /* User id 0 always gets read/write access. */ 1574 if (cred->cr_uid == 0) { 1575 /* For VEXEC, at least one of the execute bits must be set. */ 1576 if ((acc_mode & VEXEC) && type != VDIR && 1577 (file_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) 1578 return EACCES; 1579 return 0; 1580 } 1581 1582 mask = 0; 1583 1584 /* Otherwise, check the owner. */ 1585 if (cred->cr_uid == uid) { 1586 if (acc_mode & VEXEC) 1587 mask |= S_IXUSR; 1588 if (acc_mode & VREAD) 1589 mask |= S_IRUSR; 1590 if (acc_mode & VWRITE) 1591 mask |= S_IWUSR; 1592 return (file_mode & mask) == mask ? 0 : EACCES; 1593 } 1594 1595 /* Otherwise, check the groups. */ 1596 if (groupmember(gid, cred)) { 1597 if (acc_mode & VEXEC) 1598 mask |= S_IXGRP; 1599 if (acc_mode & VREAD) 1600 mask |= S_IRGRP; 1601 if (acc_mode & VWRITE) 1602 mask |= S_IWGRP; 1603 return (file_mode & mask) == mask ? 0 : EACCES; 1604 } 1605 1606 /* Otherwise, check everyone else. */ 1607 if (acc_mode & VEXEC) 1608 mask |= S_IXOTH; 1609 if (acc_mode & VREAD) 1610 mask |= S_IROTH; 1611 if (acc_mode & VWRITE) 1612 mask |= S_IWOTH; 1613 return (file_mode & mask) == mask ? 0 : EACCES; 1614 } 1615 1616 int 1617 vnoperm(struct vnode *vp) 1618 { 1619 if (vp->v_flag & VROOT || vp->v_mount == NULL) 1620 return 0; 1621 1622 return (vp->v_mount->mnt_flag & MNT_NOPERM); 1623 } 1624 1625 struct rwlock vfs_stall_lock = RWLOCK_INITIALIZER("vfs_stall"); 1626 1627 int 1628 vfs_stall(struct proc *p, int stall) 1629 { 1630 struct mount *mp; 1631 int allerror = 0, error; 1632 1633 if (stall) 1634 rw_enter_write(&vfs_stall_lock); 1635 1636 /* 1637 * The loop variable mp is protected by vfs_busy() so that it cannot 1638 * be unmounted while VFS_SYNC() sleeps. Traverse forward to keep the 1639 * lock order consistent with dounmount(). 1640 */ 1641 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 1642 if (stall) { 1643 error = vfs_busy(mp, VB_WRITE|VB_WAIT|VB_DUPOK); 1644 if (error) { 1645 printf("%s: busy\n", mp->mnt_stat.f_mntonname); 1646 allerror = error; 1647 continue; 1648 } 1649 uvm_vnp_sync(mp); 1650 error = VFS_SYNC(mp, MNT_WAIT, stall, p->p_ucred, p); 1651 if (error) { 1652 printf("%s: failed to sync\n", mp->mnt_stat.f_mntonname); 1653 vfs_unbusy(mp); 1654 allerror = error; 1655 continue; 1656 } 1657 mp->mnt_flag |= MNT_STALLED; 1658 } else { 1659 if (mp->mnt_flag & MNT_STALLED) { 1660 vfs_unbusy(mp); 1661 mp->mnt_flag &= ~MNT_STALLED; 1662 } 1663 } 1664 } 1665 1666 if (!stall) 1667 rw_exit_write(&vfs_stall_lock); 1668 1669 return (allerror); 1670 } 1671 1672 void 1673 vfs_stall_barrier(void) 1674 { 1675 rw_enter_read(&vfs_stall_lock); 1676 rw_exit_read(&vfs_stall_lock); 1677 } 1678 1679 /* 1680 * Unmount all file systems. 1681 * We traverse the list in reverse order under the assumption that doing so 1682 * will avoid needing to worry about dependencies. 1683 */ 1684 void 1685 vfs_unmountall(void) 1686 { 1687 struct mount *mp, *nmp; 1688 int allerror, error, again = 1; 1689 1690 retry: 1691 allerror = 0; 1692 TAILQ_FOREACH_REVERSE_SAFE(mp, &mountlist, mntlist, mnt_list, nmp) { 1693 if (vfs_busy(mp, VB_WRITE|VB_NOWAIT)) 1694 continue; 1695 /* XXX Here is a race, the next pointer is not locked. */ 1696 if ((error = dounmount(mp, MNT_FORCE, curproc)) != 0) { 1697 printf("unmount of %s failed with error %d\n", 1698 mp->mnt_stat.f_mntonname, error); 1699 allerror = 1; 1700 } 1701 } 1702 1703 if (allerror) { 1704 printf("WARNING: some file systems would not unmount\n"); 1705 if (again) { 1706 printf("retrying\n"); 1707 again = 0; 1708 goto retry; 1709 } 1710 } 1711 } 1712 1713 /* 1714 * Sync and unmount file systems before shutting down. 1715 */ 1716 void 1717 vfs_shutdown(struct proc *p) 1718 { 1719 #ifdef ACCOUNTING 1720 acct_shutdown(); 1721 #endif 1722 1723 printf("syncing disks..."); 1724 1725 if (panicstr == 0) { 1726 /* Sync before unmount, in case we hang on something. */ 1727 sys_sync(p, NULL, NULL); 1728 vfs_unmountall(); 1729 } 1730 1731 #if NSOFTRAID > 0 1732 sr_quiesce(); 1733 #endif 1734 1735 if (vfs_syncwait(p, 1)) 1736 printf(" giving up\n"); 1737 else 1738 printf(" done\n"); 1739 } 1740 1741 /* 1742 * perform sync() operation and wait for buffers to flush. 1743 */ 1744 int 1745 vfs_syncwait(struct proc *p, int verbose) 1746 { 1747 struct buf *bp; 1748 int iter, nbusy, dcount, s; 1749 #ifdef MULTIPROCESSOR 1750 int hold_count; 1751 #endif 1752 1753 sys_sync(p, NULL, NULL); 1754 1755 /* Wait for sync to finish. */ 1756 dcount = 10000; 1757 for (iter = 0; iter < 20; iter++) { 1758 nbusy = 0; 1759 LIST_FOREACH(bp, &bufhead, b_list) { 1760 if ((bp->b_flags & (B_BUSY|B_INVAL|B_READ)) == B_BUSY) 1761 nbusy++; 1762 /* 1763 * With soft updates, some buffers that are 1764 * written will be remarked as dirty until other 1765 * buffers are written. 1766 */ 1767 if (bp->b_flags & B_DELWRI) { 1768 s = splbio(); 1769 bremfree(bp); 1770 buf_acquire(bp); 1771 splx(s); 1772 nbusy++; 1773 bawrite(bp); 1774 if (dcount-- <= 0) { 1775 if (verbose) 1776 printf("softdep "); 1777 return 1; 1778 } 1779 } 1780 } 1781 if (nbusy == 0) 1782 break; 1783 if (verbose) 1784 printf("%d ", nbusy); 1785 #ifdef MULTIPROCESSOR 1786 if (_kernel_lock_held()) 1787 hold_count = __mp_release_all(&kernel_lock); 1788 else 1789 hold_count = 0; 1790 #endif 1791 DELAY(40000 * iter); 1792 #ifdef MULTIPROCESSOR 1793 if (hold_count) 1794 __mp_acquire_count(&kernel_lock, hold_count); 1795 #endif 1796 } 1797 1798 return nbusy; 1799 } 1800 1801 /* 1802 * posix file system related system variables. 1803 */ 1804 int 1805 fs_posix_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, 1806 void *newp, size_t newlen, struct proc *p) 1807 { 1808 /* all sysctl names at this level are terminal */ 1809 if (namelen != 1) 1810 return (ENOTDIR); 1811 1812 switch (name[0]) { 1813 case FS_POSIX_SETUID: 1814 if (newp && securelevel > 0) 1815 return (EPERM); 1816 return(sysctl_int(oldp, oldlenp, newp, newlen, &suid_clear)); 1817 default: 1818 return (EOPNOTSUPP); 1819 } 1820 /* NOTREACHED */ 1821 } 1822 1823 /* 1824 * file system related system variables. 1825 */ 1826 int 1827 fs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 1828 size_t newlen, struct proc *p) 1829 { 1830 sysctlfn *fn; 1831 1832 switch (name[0]) { 1833 case FS_POSIX: 1834 fn = fs_posix_sysctl; 1835 break; 1836 default: 1837 return (EOPNOTSUPP); 1838 } 1839 return (*fn)(name + 1, namelen - 1, oldp, oldlenp, newp, newlen, p); 1840 } 1841 1842 1843 /* 1844 * Routines dealing with vnodes and buffers 1845 */ 1846 1847 /* 1848 * Wait for all outstanding I/Os to complete 1849 * 1850 * Manipulates v_numoutput. Must be called at splbio() 1851 */ 1852 int 1853 vwaitforio(struct vnode *vp, int slpflag, char *wmesg, int timeo) 1854 { 1855 int error = 0; 1856 1857 splassert(IPL_BIO); 1858 1859 while (vp->v_numoutput) { 1860 vp->v_bioflag |= VBIOWAIT; 1861 error = tsleep(&vp->v_numoutput, 1862 slpflag | (PRIBIO + 1), wmesg, timeo); 1863 if (error) 1864 break; 1865 } 1866 1867 return (error); 1868 } 1869 1870 /* 1871 * Update outstanding I/O count and do wakeup if requested. 1872 * 1873 * Manipulates v_numoutput. Must be called at splbio() 1874 */ 1875 void 1876 vwakeup(struct vnode *vp) 1877 { 1878 splassert(IPL_BIO); 1879 1880 if (vp != NULL) { 1881 if (vp->v_numoutput-- == 0) 1882 panic("vwakeup: neg numoutput"); 1883 if ((vp->v_bioflag & VBIOWAIT) && vp->v_numoutput == 0) { 1884 vp->v_bioflag &= ~VBIOWAIT; 1885 wakeup(&vp->v_numoutput); 1886 } 1887 } 1888 } 1889 1890 /* 1891 * Flush out and invalidate all buffers associated with a vnode. 1892 * Called with the underlying object locked. 1893 */ 1894 int 1895 vinvalbuf(struct vnode *vp, int flags, struct ucred *cred, struct proc *p, 1896 int slpflag, int slptimeo) 1897 { 1898 struct buf *bp; 1899 struct buf *nbp, *blist; 1900 int s, error; 1901 1902 #ifdef VFSLCKDEBUG 1903 if ((vp->v_flag & VLOCKSWORK) && !VOP_ISLOCKED(vp)) 1904 panic("%s: vp isn't locked, vp %p", __func__, vp); 1905 #endif 1906 1907 if (flags & V_SAVE) { 1908 s = splbio(); 1909 vwaitforio(vp, 0, "vinvalbuf", 0); 1910 if (!LIST_EMPTY(&vp->v_dirtyblkhd)) { 1911 splx(s); 1912 if ((error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) != 0) 1913 return (error); 1914 s = splbio(); 1915 if (vp->v_numoutput > 0 || 1916 !LIST_EMPTY(&vp->v_dirtyblkhd)) 1917 panic("%s: dirty bufs, vp %p", __func__, vp); 1918 } 1919 splx(s); 1920 } 1921 loop: 1922 s = splbio(); 1923 for (;;) { 1924 if ((blist = LIST_FIRST(&vp->v_cleanblkhd)) && 1925 (flags & V_SAVEMETA)) 1926 while (blist && blist->b_lblkno < 0) 1927 blist = LIST_NEXT(blist, b_vnbufs); 1928 if (blist == NULL && 1929 (blist = LIST_FIRST(&vp->v_dirtyblkhd)) && 1930 (flags & V_SAVEMETA)) 1931 while (blist && blist->b_lblkno < 0) 1932 blist = LIST_NEXT(blist, b_vnbufs); 1933 if (!blist) 1934 break; 1935 1936 for (bp = blist; bp; bp = nbp) { 1937 nbp = LIST_NEXT(bp, b_vnbufs); 1938 if (flags & V_SAVEMETA && bp->b_lblkno < 0) 1939 continue; 1940 if (bp->b_flags & B_BUSY) { 1941 bp->b_flags |= B_WANTED; 1942 error = tsleep(bp, slpflag | (PRIBIO + 1), 1943 "vinvalbuf", slptimeo); 1944 if (error) { 1945 splx(s); 1946 return (error); 1947 } 1948 break; 1949 } 1950 bremfree(bp); 1951 /* 1952 * XXX Since there are no node locks for NFS, I believe 1953 * there is a slight chance that a delayed write will 1954 * occur while sleeping just above, so check for it. 1955 */ 1956 if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) { 1957 buf_acquire(bp); 1958 splx(s); 1959 (void) VOP_BWRITE(bp); 1960 goto loop; 1961 } 1962 buf_acquire_nomap(bp); 1963 bp->b_flags |= B_INVAL; 1964 brelse(bp); 1965 } 1966 } 1967 if (!(flags & V_SAVEMETA) && 1968 (!LIST_EMPTY(&vp->v_dirtyblkhd) || !LIST_EMPTY(&vp->v_cleanblkhd))) 1969 panic("%s: flush failed, vp %p", __func__, vp); 1970 splx(s); 1971 return (0); 1972 } 1973 1974 void 1975 vflushbuf(struct vnode *vp, int sync) 1976 { 1977 struct buf *bp, *nbp; 1978 int s; 1979 1980 loop: 1981 s = splbio(); 1982 LIST_FOREACH_SAFE(bp, &vp->v_dirtyblkhd, b_vnbufs, nbp) { 1983 if ((bp->b_flags & B_BUSY)) 1984 continue; 1985 if ((bp->b_flags & B_DELWRI) == 0) 1986 panic("vflushbuf: not dirty"); 1987 bremfree(bp); 1988 buf_acquire(bp); 1989 splx(s); 1990 /* 1991 * Wait for I/O associated with indirect blocks to complete, 1992 * since there is no way to quickly wait for them below. 1993 */ 1994 if (bp->b_vp == vp || sync == 0) 1995 (void) bawrite(bp); 1996 else 1997 (void) bwrite(bp); 1998 goto loop; 1999 } 2000 if (sync == 0) { 2001 splx(s); 2002 return; 2003 } 2004 vwaitforio(vp, 0, "vflushbuf", 0); 2005 if (!LIST_EMPTY(&vp->v_dirtyblkhd)) { 2006 splx(s); 2007 #ifdef DIAGNOSTIC 2008 vprint("vflushbuf: dirty", vp); 2009 #endif 2010 goto loop; 2011 } 2012 splx(s); 2013 } 2014 2015 /* 2016 * Associate a buffer with a vnode. 2017 * 2018 * Manipulates buffer vnode queues. Must be called at splbio(). 2019 */ 2020 void 2021 bgetvp(struct vnode *vp, struct buf *bp) 2022 { 2023 splassert(IPL_BIO); 2024 2025 2026 if (bp->b_vp) 2027 panic("bgetvp: not free"); 2028 vhold(vp); 2029 bp->b_vp = vp; 2030 if (vp->v_type == VBLK || vp->v_type == VCHR) 2031 bp->b_dev = vp->v_rdev; 2032 else 2033 bp->b_dev = NODEV; 2034 /* 2035 * Insert onto list for new vnode. 2036 */ 2037 bufinsvn(bp, &vp->v_cleanblkhd); 2038 } 2039 2040 /* 2041 * Disassociate a buffer from a vnode. 2042 * 2043 * Manipulates vnode buffer queues. Must be called at splbio(). 2044 */ 2045 void 2046 brelvp(struct buf *bp) 2047 { 2048 struct vnode *vp; 2049 2050 splassert(IPL_BIO); 2051 2052 if ((vp = bp->b_vp) == (struct vnode *) 0) 2053 panic("brelvp: NULL"); 2054 /* 2055 * Delete from old vnode list, if on one. 2056 */ 2057 if (LIST_NEXT(bp, b_vnbufs) != NOLIST) 2058 bufremvn(bp); 2059 if ((vp->v_bioflag & VBIOONSYNCLIST) && 2060 LIST_EMPTY(&vp->v_dirtyblkhd)) { 2061 vp->v_bioflag &= ~VBIOONSYNCLIST; 2062 LIST_REMOVE(vp, v_synclist); 2063 } 2064 bp->b_vp = NULL; 2065 2066 vdrop(vp); 2067 } 2068 2069 /* 2070 * Replaces the current vnode associated with the buffer, if any, 2071 * with a new vnode. 2072 * 2073 * If an output I/O is pending on the buffer, the old vnode 2074 * I/O count is adjusted. 2075 * 2076 * Ignores vnode buffer queues. Must be called at splbio(). 2077 */ 2078 void 2079 buf_replacevnode(struct buf *bp, struct vnode *newvp) 2080 { 2081 struct vnode *oldvp = bp->b_vp; 2082 2083 splassert(IPL_BIO); 2084 2085 if (oldvp) 2086 brelvp(bp); 2087 2088 if ((bp->b_flags & (B_READ | B_DONE)) == 0) { 2089 newvp->v_numoutput++; /* put it on swapdev */ 2090 vwakeup(oldvp); 2091 } 2092 2093 bgetvp(newvp, bp); 2094 bufremvn(bp); 2095 } 2096 2097 /* 2098 * Used to assign buffers to the appropriate clean or dirty list on 2099 * the vnode and to add newly dirty vnodes to the appropriate 2100 * filesystem syncer list. 2101 * 2102 * Manipulates vnode buffer queues. Must be called at splbio(). 2103 */ 2104 void 2105 reassignbuf(struct buf *bp) 2106 { 2107 struct buflists *listheadp; 2108 int delay; 2109 struct vnode *vp = bp->b_vp; 2110 2111 splassert(IPL_BIO); 2112 2113 /* 2114 * Delete from old vnode list, if on one. 2115 */ 2116 if (LIST_NEXT(bp, b_vnbufs) != NOLIST) 2117 bufremvn(bp); 2118 2119 /* 2120 * If dirty, put on list of dirty buffers; 2121 * otherwise insert onto list of clean buffers. 2122 */ 2123 if ((bp->b_flags & B_DELWRI) == 0) { 2124 listheadp = &vp->v_cleanblkhd; 2125 if ((vp->v_bioflag & VBIOONSYNCLIST) && 2126 LIST_EMPTY(&vp->v_dirtyblkhd)) { 2127 vp->v_bioflag &= ~VBIOONSYNCLIST; 2128 LIST_REMOVE(vp, v_synclist); 2129 } 2130 } else { 2131 listheadp = &vp->v_dirtyblkhd; 2132 if ((vp->v_bioflag & VBIOONSYNCLIST) == 0) { 2133 switch (vp->v_type) { 2134 case VDIR: 2135 delay = syncdelay / 2; 2136 break; 2137 case VBLK: 2138 if (vp->v_specmountpoint != NULL) { 2139 delay = syncdelay / 3; 2140 break; 2141 } 2142 /* FALLTHROUGH */ 2143 default: 2144 delay = syncdelay; 2145 } 2146 vn_syncer_add_to_worklist(vp, delay); 2147 } 2148 } 2149 bufinsvn(bp, listheadp); 2150 } 2151 2152 /* 2153 * Check if vnode represents a disk device 2154 */ 2155 int 2156 vn_isdisk(struct vnode *vp, int *errp) 2157 { 2158 if (vp->v_type != VBLK && vp->v_type != VCHR) 2159 return (0); 2160 2161 return (1); 2162 } 2163 2164 #ifdef DDB 2165 #include <machine/db_machdep.h> 2166 #include <ddb/db_interface.h> 2167 2168 void 2169 vfs_buf_print(void *b, int full, 2170 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2171 { 2172 struct buf *bp = b; 2173 2174 (*pr)(" vp %p lblkno 0x%llx blkno 0x%llx dev 0x%x\n" 2175 " proc %p error %d flags %lb\n", 2176 bp->b_vp, (int64_t)bp->b_lblkno, (int64_t)bp->b_blkno, bp->b_dev, 2177 bp->b_proc, bp->b_error, bp->b_flags, B_BITS); 2178 2179 (*pr)(" bufsize 0x%lx bcount 0x%lx resid 0x%lx\n" 2180 " data %p saveaddr %p dep %p iodone %p\n", 2181 bp->b_bufsize, bp->b_bcount, (long)bp->b_resid, 2182 bp->b_data, bp->b_saveaddr, 2183 LIST_FIRST(&bp->b_dep), bp->b_iodone); 2184 2185 (*pr)(" dirty {off 0x%x end 0x%x} valid {off 0x%x end 0x%x}\n", 2186 bp->b_dirtyoff, bp->b_dirtyend, bp->b_validoff, bp->b_validend); 2187 2188 #ifdef FFS_SOFTUPDATES 2189 if (full) 2190 softdep_print(bp, full, pr); 2191 #endif 2192 } 2193 2194 const char *vtypes[] = { VTYPE_NAMES }; 2195 const char *vtags[] = { VTAG_NAMES }; 2196 2197 void 2198 vfs_vnode_print(void *v, int full, 2199 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2200 { 2201 struct vnode *vp = v; 2202 2203 (*pr)("tag %s(%d) type %s(%d) mount %p typedata %p\n", 2204 (u_int)vp->v_tag >= nitems(vtags)? "<unk>":vtags[vp->v_tag], 2205 vp->v_tag, 2206 (u_int)vp->v_type >= nitems(vtypes)? "<unk>":vtypes[vp->v_type], 2207 vp->v_type, vp->v_mount, vp->v_mountedhere); 2208 2209 (*pr)("data %p usecount %d writecount %d holdcnt %d numoutput %d\n", 2210 vp->v_data, vp->v_usecount, vp->v_writecount, 2211 vp->v_holdcnt, vp->v_numoutput); 2212 2213 /* uvm_object_printit(&vp->v_uobj, full, pr); */ 2214 2215 if (full) { 2216 struct buf *bp; 2217 2218 (*pr)("clean bufs:\n"); 2219 LIST_FOREACH(bp, &vp->v_cleanblkhd, b_vnbufs) { 2220 (*pr)(" bp %p\n", bp); 2221 vfs_buf_print(bp, full, pr); 2222 } 2223 2224 (*pr)("dirty bufs:\n"); 2225 LIST_FOREACH(bp, &vp->v_dirtyblkhd, b_vnbufs) { 2226 (*pr)(" bp %p\n", bp); 2227 vfs_buf_print(bp, full, pr); 2228 } 2229 } 2230 } 2231 2232 void 2233 vfs_mount_print(struct mount *mp, int full, 2234 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2235 { 2236 struct vfsconf *vfc = mp->mnt_vfc; 2237 struct vnode *vp; 2238 int cnt; 2239 2240 (*pr)("flags %b\nvnodecovered %p syncer %p data %p\n", 2241 mp->mnt_flag, MNT_BITS, 2242 mp->mnt_vnodecovered, mp->mnt_syncer, mp->mnt_data); 2243 2244 (*pr)("vfsconf: ops %p name \"%s\" num %d ref %u flags 0x%x\n", 2245 vfc->vfc_vfsops, vfc->vfc_name, vfc->vfc_typenum, 2246 vfc->vfc_refcount, vfc->vfc_flags); 2247 2248 (*pr)("statvfs cache: bsize %x iosize %x\nblocks %llu free %llu avail %lld\n", 2249 mp->mnt_stat.f_bsize, mp->mnt_stat.f_iosize, mp->mnt_stat.f_blocks, 2250 mp->mnt_stat.f_bfree, mp->mnt_stat.f_bavail); 2251 2252 (*pr)(" files %llu ffiles %llu favail %lld\n", mp->mnt_stat.f_files, 2253 mp->mnt_stat.f_ffree, mp->mnt_stat.f_favail); 2254 2255 (*pr)(" f_fsidx {0x%x, 0x%x} owner %u ctime 0x%llx\n", 2256 mp->mnt_stat.f_fsid.val[0], mp->mnt_stat.f_fsid.val[1], 2257 mp->mnt_stat.f_owner, mp->mnt_stat.f_ctime); 2258 2259 (*pr)(" syncwrites %llu asyncwrites = %llu\n", 2260 mp->mnt_stat.f_syncwrites, mp->mnt_stat.f_asyncwrites); 2261 2262 (*pr)(" syncreads %llu asyncreads = %llu\n", 2263 mp->mnt_stat.f_syncreads, mp->mnt_stat.f_asyncreads); 2264 2265 (*pr)(" fstype \"%s\" mnton \"%s\" mntfrom \"%s\" mntspec \"%s\"\n", 2266 mp->mnt_stat.f_fstypename, mp->mnt_stat.f_mntonname, 2267 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntfromspec); 2268 2269 (*pr)("locked vnodes:"); 2270 /* XXX would take mountlist lock, except ddb has no context */ 2271 cnt = 0; 2272 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 2273 if (VOP_ISLOCKED(vp)) { 2274 if (cnt == 0) 2275 (*pr)("\n %p", vp); 2276 else if ((cnt % (72 / (sizeof(void *) * 2 + 4))) == 0) 2277 (*pr)(",\n %p", vp); 2278 else 2279 (*pr)(", %p", vp); 2280 cnt++; 2281 } 2282 } 2283 (*pr)("\n"); 2284 2285 if (full) { 2286 (*pr)("all vnodes:"); 2287 /* XXX would take mountlist lock, except ddb has no context */ 2288 cnt = 0; 2289 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 2290 if (cnt == 0) 2291 (*pr)("\n %p", vp); 2292 else if ((cnt % (72 / (sizeof(void *) * 2 + 4))) == 0) 2293 (*pr)(",\n %p", vp); 2294 else 2295 (*pr)(", %p", vp); 2296 cnt++; 2297 } 2298 (*pr)("\n"); 2299 } 2300 } 2301 #endif /* DDB */ 2302 2303 void 2304 copy_statfs_info(struct statfs *sbp, const struct mount *mp) 2305 { 2306 const struct statfs *mbp; 2307 2308 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 2309 2310 if (sbp == (mbp = &mp->mnt_stat)) 2311 return; 2312 2313 sbp->f_fsid = mbp->f_fsid; 2314 sbp->f_owner = mbp->f_owner; 2315 sbp->f_flags = mbp->f_flags; 2316 sbp->f_syncwrites = mbp->f_syncwrites; 2317 sbp->f_asyncwrites = mbp->f_asyncwrites; 2318 sbp->f_syncreads = mbp->f_syncreads; 2319 sbp->f_asyncreads = mbp->f_asyncreads; 2320 sbp->f_namemax = mbp->f_namemax; 2321 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 2322 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 2323 memcpy(sbp->f_mntfromspec, mp->mnt_stat.f_mntfromspec, MNAMELEN); 2324 memcpy(&sbp->mount_info, &mp->mnt_stat.mount_info, 2325 sizeof(union mount_info)); 2326 } 2327