1 /* $OpenBSD: vfs_subr.c,v 1.324 2024/10/18 05:52:32 miod 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/fcntl.h> 50 #include <sys/conf.h> 51 #include <sys/vnode.h> 52 #include <sys/lock.h> 53 #include <sys/lockf.h> 54 #include <sys/stat.h> 55 #include <sys/acct.h> 56 #include <sys/namei.h> 57 #include <sys/ucred.h> 58 #include <sys/buf.h> 59 #include <sys/errno.h> 60 #include <sys/malloc.h> 61 #include <sys/mbuf.h> 62 #include <sys/syscallargs.h> 63 #include <sys/pool.h> 64 #include <sys/tree.h> 65 #include <sys/specdev.h> 66 #include <sys/atomic.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_quiesce(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 TAILQ_HEAD(freelst, vnode); 100 struct freelst vnode_hold_list; /* list of vnodes referencing buffers */ 101 struct freelst vnode_free_list; /* vnode free list */ 102 103 struct mntlist mountlist; /* mounted filesystem list */ 104 105 void vclean(struct vnode *, int, struct proc *); 106 107 void insmntque(struct vnode *, struct mount *); 108 int getdevvp(dev_t, struct vnode **, enum vtype); 109 110 int vfs_hang_addrlist(struct mount *, struct netexport *, 111 struct export_args *); 112 int vfs_free_netcred(struct radix_node *, void *, u_int); 113 void vfs_free_addrlist(struct netexport *); 114 void vputonfreelist(struct vnode *); 115 116 int vflush_vnode(struct vnode *, void *); 117 int maxvnodes; 118 119 struct mutex vnode_mtx = MUTEX_INITIALIZER(IPL_BIO); 120 121 void vfs_unmountall(void); 122 123 #ifdef DEBUG 124 void printlockedvnodes(void); 125 #endif 126 127 struct pool vnode_pool; 128 struct pool uvm_vnode_pool; 129 130 static inline int rb_buf_compare(const struct buf *b1, const struct buf *b2); 131 RBT_GENERATE(buf_rb_bufs, buf, b_rbbufs, rb_buf_compare); 132 133 static inline int 134 rb_buf_compare(const struct buf *b1, const struct buf *b2) 135 { 136 if (b1->b_lblkno < b2->b_lblkno) 137 return(-1); 138 if (b1->b_lblkno > b2->b_lblkno) 139 return(1); 140 return(0); 141 } 142 143 /* 144 * Initialize the vnode management data structures. 145 */ 146 void 147 vntblinit(void) 148 { 149 /* buffer cache may need a vnode for each buffer */ 150 maxvnodes = 2 * initialvnodes; 151 pool_init(&vnode_pool, sizeof(struct vnode), 0, IPL_NONE, 152 PR_WAITOK, "vnodes", NULL); 153 pool_init(&uvm_vnode_pool, sizeof(struct uvm_vnode), 0, IPL_NONE, 154 PR_WAITOK, "uvmvnodes", NULL); 155 TAILQ_INIT(&vnode_hold_list); 156 TAILQ_INIT(&vnode_free_list); 157 TAILQ_INIT(&mountlist); 158 /* 159 * Initialize the filesystem syncer. 160 */ 161 vn_initialize_syncerd(); 162 163 #ifdef NFSSERVER 164 rn_init(sizeof(struct sockaddr_in)); 165 #endif /* NFSSERVER */ 166 } 167 168 /* 169 * Allocate a mount point. 170 * 171 * The returned mount point is marked as busy. 172 */ 173 struct mount * 174 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp) 175 { 176 struct mount *mp; 177 178 mp = malloc(sizeof(*mp), M_MOUNT, M_WAITOK|M_ZERO); 179 rw_init_flags(&mp->mnt_lock, "vfslock", RWL_IS_VNODE); 180 (void)vfs_busy(mp, VB_READ|VB_NOWAIT); 181 182 TAILQ_INIT(&mp->mnt_vnodelist); 183 mp->mnt_vnodecovered = vp; 184 185 atomic_inc_int(&vfsp->vfc_refcount); 186 mp->mnt_vfc = vfsp; 187 mp->mnt_op = vfsp->vfc_vfsops; 188 mp->mnt_flag = vfsp->vfc_flags; 189 strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 190 191 return (mp); 192 } 193 194 /* 195 * Release a mount point. 196 */ 197 void 198 vfs_mount_free(struct mount *mp) 199 { 200 atomic_dec_int(&mp->mnt_vfc->vfc_refcount); 201 free(mp, M_MOUNT, sizeof(*mp)); 202 } 203 204 /* 205 * Mark a mount point as busy. Used to synchronize access and to delay 206 * unmounting. 207 * 208 * Default behaviour is to attempt getting a READ lock and in case of an 209 * ongoing unmount, to wait for it to finish and then return failure. 210 */ 211 int 212 vfs_busy(struct mount *mp, int flags) 213 { 214 int rwflags = 0; 215 216 if (flags & VB_WRITE) 217 rwflags |= RW_WRITE; 218 else 219 rwflags |= RW_READ; 220 221 if (flags & VB_WAIT) 222 rwflags |= RW_SLEEPFAIL; 223 else 224 rwflags |= RW_NOSLEEP; 225 226 #ifdef WITNESS 227 if (flags & VB_DUPOK) 228 rwflags |= RW_DUPOK; 229 #endif 230 231 if (rw_enter(&mp->mnt_lock, rwflags)) 232 return (EBUSY); 233 234 return (0); 235 } 236 237 /* 238 * Free a busy file system 239 */ 240 void 241 vfs_unbusy(struct mount *mp) 242 { 243 rw_exit(&mp->mnt_lock); 244 } 245 246 int 247 vfs_isbusy(struct mount *mp) 248 { 249 return (rw_status(&mp->mnt_lock) != 0); 250 } 251 252 /* 253 * Lookup a filesystem type, and if found allocate and initialize 254 * a mount structure for it. 255 * 256 * Devname is usually updated by mount(8) after booting. 257 */ 258 int 259 vfs_rootmountalloc(char *fstypename, char *devname, struct mount **mpp) 260 { 261 struct vfsconf *vfsp; 262 struct mount *mp; 263 264 vfsp = vfs_byname(fstypename); 265 if (vfsp == NULL) 266 return (ENODEV); 267 mp = vfs_mount_alloc(NULLVP, vfsp); 268 mp->mnt_flag |= MNT_RDONLY; 269 mp->mnt_stat.f_mntonname[0] = '/'; 270 strlcpy(mp->mnt_stat.f_mntfromname, devname, MNAMELEN); 271 strlcpy(mp->mnt_stat.f_mntfromspec, devname, MNAMELEN); 272 *mpp = mp; 273 return (0); 274 } 275 276 /* 277 * Lookup a mount point by filesystem identifier. 278 */ 279 struct mount * 280 vfs_getvfs(fsid_t *fsid) 281 { 282 struct mount *mp; 283 284 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 285 if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && 286 mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { 287 return (mp); 288 } 289 } 290 291 return (NULL); 292 } 293 294 295 /* 296 * Get a new unique fsid 297 */ 298 void 299 vfs_getnewfsid(struct mount *mp) 300 { 301 static u_short xxxfs_mntid; 302 303 fsid_t tfsid; 304 int mtype; 305 306 mtype = mp->mnt_vfc->vfc_typenum; 307 mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + mtype, 0); 308 mp->mnt_stat.f_fsid.val[1] = mtype; 309 if (xxxfs_mntid == 0) 310 ++xxxfs_mntid; 311 tfsid.val[0] = makedev(nblkdev + mtype, xxxfs_mntid); 312 tfsid.val[1] = mtype; 313 if (!TAILQ_EMPTY(&mountlist)) { 314 while (vfs_getvfs(&tfsid)) { 315 tfsid.val[0]++; 316 xxxfs_mntid++; 317 } 318 } 319 mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; 320 } 321 322 /* 323 * Set vnode attributes to VNOVAL 324 */ 325 void 326 vattr_null(struct vattr *vap) 327 { 328 329 vap->va_type = VNON; 330 /* 331 * Don't get fancy: u_quad_t = u_int = VNOVAL leaves the u_quad_t 332 * with 2^31-1 instead of 2^64-1. Just write'm out and let 333 * the compiler do its job. 334 */ 335 vap->va_mode = VNOVAL; 336 vap->va_nlink = VNOVAL; 337 vap->va_uid = VNOVAL; 338 vap->va_gid = VNOVAL; 339 vap->va_fsid = VNOVAL; 340 vap->va_fileid = VNOVAL; 341 vap->va_size = VNOVAL; 342 vap->va_blocksize = VNOVAL; 343 vap->va_atime.tv_sec = VNOVAL; 344 vap->va_atime.tv_nsec = VNOVAL; 345 vap->va_mtime.tv_sec = VNOVAL; 346 vap->va_mtime.tv_nsec = VNOVAL; 347 vap->va_ctime.tv_sec = VNOVAL; 348 vap->va_ctime.tv_nsec = VNOVAL; 349 vap->va_gen = VNOVAL; 350 vap->va_flags = VNOVAL; 351 vap->va_rdev = VNOVAL; 352 vap->va_bytes = VNOVAL; 353 vap->va_filerev = VNOVAL; 354 vap->va_vaflags = 0; 355 } 356 357 /* 358 * Routines having to do with the management of the vnode table. 359 */ 360 long numvnodes; 361 362 /* 363 * Return the next vnode from the free list. 364 */ 365 int 366 getnewvnode(enum vtagtype tag, struct mount *mp, const struct vops *vops, 367 struct vnode **vpp) 368 { 369 struct proc *p = curproc; 370 struct freelst *listhd; 371 static int toggle; 372 struct vnode *vp; 373 int s; 374 375 /* 376 * allow maxvnodes to increase if the buffer cache itself 377 * is big enough to justify it. (we don't shrink it ever) 378 */ 379 maxvnodes = maxvnodes < bcstats.numbufs ? bcstats.numbufs 380 : maxvnodes; 381 382 /* 383 * We must choose whether to allocate a new vnode or recycle an 384 * existing one. The criterion for allocating a new one is that 385 * the total number of vnodes is less than the number desired or 386 * there are no vnodes on either free list. Generally we only 387 * want to recycle vnodes that have no buffers associated with 388 * them, so we look first on the vnode_free_list. If it is empty, 389 * we next consider vnodes with referencing buffers on the 390 * vnode_hold_list. The toggle ensures that half the time we 391 * will use a buffer from the vnode_hold_list, and half the time 392 * we will allocate a new one unless the list has grown to twice 393 * the desired size. We are reticent to recycle vnodes from the 394 * vnode_hold_list because we will lose the identity of all its 395 * referencing buffers. 396 */ 397 toggle ^= 1; 398 if (numvnodes / 2 > maxvnodes) 399 toggle = 0; 400 401 s = splbio(); 402 if ((numvnodes < maxvnodes) || 403 ((TAILQ_FIRST(listhd = &vnode_free_list) == NULL) && 404 ((TAILQ_FIRST(listhd = &vnode_hold_list) == NULL) || toggle))) { 405 splx(s); 406 vp = pool_get(&vnode_pool, PR_WAITOK | PR_ZERO); 407 vp->v_uvm = pool_get(&uvm_vnode_pool, PR_WAITOK | PR_ZERO); 408 vp->v_uvm->u_vnode = vp; 409 uvm_obj_init(&vp->v_uvm->u_obj, &uvm_vnodeops, 0); 410 RBT_INIT(buf_rb_bufs, &vp->v_bufs_tree); 411 cache_tree_init(&vp->v_nc_tree); 412 TAILQ_INIT(&vp->v_cache_dst); 413 numvnodes++; 414 } else { 415 TAILQ_FOREACH(vp, listhd, v_freelist) { 416 if (VOP_ISLOCKED(vp) == 0) 417 break; 418 } 419 /* 420 * Unless this is a bad time of the month, at most 421 * the first NCPUS items on the free list are 422 * locked, so this is close enough to being empty. 423 */ 424 if (vp == NULL) { 425 splx(s); 426 tablefull("vnode"); 427 *vpp = NULL; 428 return (ENFILE); 429 } 430 431 #ifdef DIAGNOSTIC 432 if (vp->v_usecount) { 433 vprint("free vnode", vp); 434 panic("free vnode isn't"); 435 } 436 #endif 437 438 TAILQ_REMOVE(listhd, vp, v_freelist); 439 vp->v_bioflag &= ~VBIOONFREELIST; 440 splx(s); 441 442 if (vp->v_type != VBAD) 443 vgonel(vp, p); 444 #ifdef DIAGNOSTIC 445 if (vp->v_data) { 446 vprint("cleaned vnode", vp); 447 panic("cleaned vnode isn't"); 448 } 449 s = splbio(); 450 if (vp->v_numoutput) 451 panic("Clean vnode has pending I/O's"); 452 splx(s); 453 #endif 454 vp->v_flag = 0; 455 vp->v_socket = NULL; 456 } 457 cache_purge(vp); 458 vp->v_type = VNON; 459 vp->v_tag = tag; 460 vp->v_op = vops; 461 insmntque(vp, mp); 462 *vpp = vp; 463 vp->v_usecount = 1; 464 vp->v_data = NULL; 465 return (0); 466 } 467 468 /* 469 * Move a vnode from one mount queue to another. 470 */ 471 void 472 insmntque(struct vnode *vp, struct mount *mp) 473 { 474 /* 475 * Delete from old mount point vnode list, if on one. 476 */ 477 if (vp->v_mount != NULL) 478 TAILQ_REMOVE(&vp->v_mount->mnt_vnodelist, vp, v_mntvnodes); 479 /* 480 * Insert into list of vnodes for the new mount point, if available. 481 */ 482 if ((vp->v_mount = mp) != NULL) 483 TAILQ_INSERT_TAIL(&mp->mnt_vnodelist, vp, v_mntvnodes); 484 } 485 486 /* 487 * Create a vnode for a block device. 488 * Used for root filesystem, argdev, and swap areas. 489 * Also used for memory file system special devices. 490 */ 491 int 492 bdevvp(dev_t dev, struct vnode **vpp) 493 { 494 return (getdevvp(dev, vpp, VBLK)); 495 } 496 497 /* 498 * Create a vnode for a character device. 499 * Used for console handling. 500 */ 501 int 502 cdevvp(dev_t dev, struct vnode **vpp) 503 { 504 return (getdevvp(dev, vpp, VCHR)); 505 } 506 507 /* 508 * Create a vnode for a device. 509 * Used by bdevvp (block device) for root file system etc., 510 * and by cdevvp (character device) for console. 511 */ 512 int 513 getdevvp(dev_t dev, struct vnode **vpp, enum vtype type) 514 { 515 struct vnode *vp; 516 struct vnode *nvp; 517 int error; 518 519 if (dev == NODEV) { 520 *vpp = NULLVP; 521 return (0); 522 } 523 error = getnewvnode(VT_NON, NULL, &spec_vops, &nvp); 524 if (error) { 525 *vpp = NULLVP; 526 return (error); 527 } 528 vp = nvp; 529 vp->v_type = type; 530 if ((nvp = checkalias(vp, dev, NULL)) != NULL) { 531 vput(vp); 532 vp = nvp; 533 } 534 if (vp->v_type == VCHR && cdevsw[major(vp->v_rdev)].d_type == D_TTY) 535 vp->v_flag |= VISTTY; 536 *vpp = vp; 537 return (0); 538 } 539 540 /* 541 * Check to see if the new vnode represents a special device 542 * for which we already have a vnode (either because of 543 * bdevvp() or because of a different vnode representing 544 * the same block device). If such an alias exists, deallocate 545 * the existing contents and return the aliased vnode. The 546 * caller is responsible for filling it with its new contents. 547 */ 548 struct vnode * 549 checkalias(struct vnode *nvp, dev_t nvp_rdev, struct mount *mp) 550 { 551 struct proc *p = curproc; 552 struct vnode *vp; 553 struct vnodechain *vchain; 554 555 if (nvp->v_type != VBLK && nvp->v_type != VCHR) 556 return (NULLVP); 557 558 vchain = &speclisth[SPECHASH(nvp_rdev)]; 559 loop: 560 SLIST_FOREACH(vp, vchain, v_specnext) { 561 if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) { 562 continue; 563 } 564 /* 565 * Alias, but not in use, so flush it out. 566 */ 567 if (vp->v_usecount == 0) { 568 vgonel(vp, p); 569 goto loop; 570 } 571 if (vget(vp, LK_EXCLUSIVE)) { 572 goto loop; 573 } 574 break; 575 } 576 577 /* 578 * Common case is actually in the if statement 579 */ 580 if (vp == NULL || !(vp->v_tag == VT_NON && vp->v_type == VBLK)) { 581 nvp->v_specinfo = malloc(sizeof(struct specinfo), M_VNODE, 582 M_WAITOK); 583 nvp->v_rdev = nvp_rdev; 584 nvp->v_hashchain = vchain; 585 nvp->v_specmountpoint = NULL; 586 nvp->v_speclockf = NULL; 587 nvp->v_specbitmap = NULL; 588 if (nvp->v_type == VCHR && 589 (cdevsw[major(nvp_rdev)].d_flags & D_CLONE) && 590 (minor(nvp_rdev) >> CLONE_SHIFT == 0)) { 591 if (vp != NULLVP) 592 nvp->v_specbitmap = vp->v_specbitmap; 593 else 594 nvp->v_specbitmap = malloc(CLONE_MAPSZ, 595 M_VNODE, M_WAITOK | M_ZERO); 596 } 597 SLIST_INSERT_HEAD(vchain, nvp, v_specnext); 598 if (vp != NULLVP) { 599 nvp->v_flag |= VALIASED; 600 vp->v_flag |= VALIASED; 601 vput(vp); 602 } 603 return (NULLVP); 604 } 605 606 /* 607 * This code is the uncommon case. It is called in case 608 * we found an alias that was VT_NON && vtype of VBLK 609 * This means we found a block device that was created 610 * using bdevvp. 611 * An example of such a vnode is the root partition device vnode 612 * created in ffs_mountroot. 613 * 614 * The vnodes created by bdevvp should not be aliased (why?). 615 */ 616 617 VOP_UNLOCK(vp); 618 vclean(vp, 0, p); 619 vp->v_op = nvp->v_op; 620 vp->v_tag = nvp->v_tag; 621 nvp->v_type = VNON; 622 insmntque(vp, mp); 623 return (vp); 624 } 625 626 /* 627 * Grab a particular vnode from the free list, increment its 628 * reference count and lock it. If the vnode lock bit is set, 629 * the vnode is being eliminated in vgone. In that case, we 630 * cannot grab it, so the process is awakened when the 631 * transition is completed, and an error code is returned to 632 * indicate that the vnode is no longer usable, possibly 633 * having been changed to a new file system type. 634 */ 635 int 636 vget(struct vnode *vp, int flags) 637 { 638 int error, s, onfreelist; 639 640 /* 641 * If the vnode is in the process of being cleaned out for 642 * another use, we wait for the cleaning to finish and then 643 * return failure. Cleaning is determined by checking that 644 * the VXLOCK flag is set. 645 */ 646 mtx_enter(&vnode_mtx); 647 if (vp->v_lflag & VXLOCK) { 648 if (flags & LK_NOWAIT) { 649 mtx_leave(&vnode_mtx); 650 return (EBUSY); 651 } 652 653 vp->v_lflag |= VXWANT; 654 msleep_nsec(vp, &vnode_mtx, PINOD, "vget", INFSLP); 655 mtx_leave(&vnode_mtx); 656 return (ENOENT); 657 } 658 mtx_leave(&vnode_mtx); 659 660 s = splbio(); 661 onfreelist = vp->v_bioflag & VBIOONFREELIST; 662 if (vp->v_usecount == 0 && onfreelist) { 663 if (vp->v_holdcnt > 0) 664 TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist); 665 else 666 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 667 vp->v_bioflag &= ~VBIOONFREELIST; 668 } 669 splx(s); 670 671 vp->v_usecount++; 672 if (flags & LK_TYPE_MASK) { 673 if ((error = vn_lock(vp, flags)) != 0) { 674 vp->v_usecount--; 675 if (vp->v_usecount == 0 && onfreelist) 676 vputonfreelist(vp); 677 } 678 return (error); 679 } 680 681 return (0); 682 } 683 684 685 /* Vnode reference. */ 686 void 687 vref(struct vnode *vp) 688 { 689 KERNEL_ASSERT_LOCKED(); 690 691 #ifdef DIAGNOSTIC 692 if (vp->v_usecount == 0) 693 panic("vref used where vget required"); 694 if (vp->v_type == VNON) 695 panic("vref on a VNON vnode"); 696 #endif 697 vp->v_usecount++; 698 } 699 700 void 701 vputonfreelist(struct vnode *vp) 702 { 703 int s; 704 struct freelst *lst; 705 706 s = splbio(); 707 #ifdef DIAGNOSTIC 708 if (vp->v_usecount != 0) 709 panic("Use count is not zero!"); 710 711 /* 712 * If the hold count is still positive, one or many threads could still 713 * be waiting on the vnode lock inside uvn_io(). 714 */ 715 if (vp->v_holdcnt == 0 && vp->v_lockcount != 0) 716 panic("%s: lock count is not zero", __func__); 717 718 if (vp->v_bioflag & VBIOONFREELIST) { 719 vprint("vnode already on free list: ", vp); 720 panic("vnode already on free list"); 721 } 722 #endif 723 724 vp->v_bioflag |= VBIOONFREELIST; 725 vp->v_bioflag &= ~VBIOERROR; 726 727 if (vp->v_holdcnt > 0) 728 lst = &vnode_hold_list; 729 else 730 lst = &vnode_free_list; 731 732 if (vp->v_type == VBAD) 733 TAILQ_INSERT_HEAD(lst, vp, v_freelist); 734 else 735 TAILQ_INSERT_TAIL(lst, vp, v_freelist); 736 737 splx(s); 738 } 739 740 /* 741 * vput(), just unlock and vrele() 742 */ 743 void 744 vput(struct vnode *vp) 745 { 746 struct proc *p = curproc; 747 int s; 748 749 #ifdef DIAGNOSTIC 750 if (vp == NULL) 751 panic("vput: null vp"); 752 #endif 753 754 #ifdef DIAGNOSTIC 755 if (vp->v_usecount == 0) { 756 vprint("vput: bad ref count", vp); 757 panic("vput: ref cnt"); 758 } 759 #endif 760 vp->v_usecount--; 761 KASSERT(vp->v_usecount > 0 || vp->v_uvcount == 0); 762 if (vp->v_usecount > 0) { 763 VOP_UNLOCK(vp); 764 return; 765 } 766 767 #ifdef DIAGNOSTIC 768 if (vp->v_writecount != 0) { 769 vprint("vput: bad writecount", vp); 770 panic("vput: v_writecount != 0"); 771 } 772 #endif 773 774 VOP_INACTIVE(vp, p); 775 776 s = splbio(); 777 if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST)) 778 vputonfreelist(vp); 779 splx(s); 780 } 781 782 /* 783 * Vnode release - use for active VNODES. 784 * If count drops to zero, call inactive routine and return to freelist. 785 * Returns 0 if it did not sleep. 786 */ 787 int 788 vrele(struct vnode *vp) 789 { 790 struct proc *p = curproc; 791 int s; 792 793 #ifdef DIAGNOSTIC 794 if (vp == NULL) 795 panic("vrele: null vp"); 796 #endif 797 #ifdef DIAGNOSTIC 798 if (vp->v_usecount == 0) { 799 vprint("vrele: bad ref count", vp); 800 panic("vrele: ref cnt"); 801 } 802 #endif 803 vp->v_usecount--; 804 if (vp->v_usecount > 0) { 805 return (0); 806 } 807 808 #ifdef DIAGNOSTIC 809 if (vp->v_writecount != 0) { 810 vprint("vrele: bad writecount", vp); 811 panic("vrele: v_writecount != 0"); 812 } 813 #endif 814 815 if (vn_lock(vp, LK_EXCLUSIVE)) { 816 #ifdef DIAGNOSTIC 817 vprint("vrele: cannot lock", vp); 818 #endif 819 return (1); 820 } 821 822 VOP_INACTIVE(vp, p); 823 824 s = splbio(); 825 if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST)) 826 vputonfreelist(vp); 827 splx(s); 828 return (1); 829 } 830 831 /* Page or buffer structure gets a reference. */ 832 void 833 vhold(struct vnode *vp) 834 { 835 int s; 836 837 s = splbio(); 838 839 /* 840 * If it is on the freelist and the hold count is currently 841 * zero, move it to the hold list. 842 */ 843 if ((vp->v_bioflag & VBIOONFREELIST) && 844 vp->v_holdcnt == 0 && vp->v_usecount == 0) { 845 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 846 TAILQ_INSERT_TAIL(&vnode_hold_list, vp, v_freelist); 847 } 848 vp->v_holdcnt++; 849 850 splx(s); 851 } 852 853 /* Lose interest in a vnode. */ 854 void 855 vdrop(struct vnode *vp) 856 { 857 int s; 858 859 s = splbio(); 860 861 #ifdef DIAGNOSTIC 862 if (vp->v_holdcnt == 0) 863 panic("vdrop: zero holdcnt"); 864 #endif 865 866 vp->v_holdcnt--; 867 868 /* 869 * If it is on the holdlist and the hold count drops to 870 * zero, move it to the free list. 871 */ 872 if ((vp->v_bioflag & VBIOONFREELIST) && 873 vp->v_holdcnt == 0 && vp->v_usecount == 0) { 874 TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist); 875 TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); 876 } 877 878 splx(s); 879 } 880 881 /* 882 * Remove any vnodes in the vnode table belonging to mount point mp. 883 * 884 * If MNT_NOFORCE is specified, there should not be any active ones, 885 * return error if any are found (nb: this is a user error, not a 886 * system error). If MNT_FORCE is specified, detach any active vnodes 887 * that are found. 888 */ 889 #ifdef DEBUG_SYSCTL 890 int busyprt = 0; /* print out busy vnodes */ 891 struct ctldebug debug_vfs_busyprt = { "vfs_busyprt", &busyprt }; 892 #endif 893 894 int 895 vfs_mount_foreach_vnode(struct mount *mp, 896 int (*func)(struct vnode *, void *), void *arg) { 897 struct vnode *vp, *nvp; 898 int error = 0; 899 900 loop: 901 TAILQ_FOREACH_SAFE(vp , &mp->mnt_vnodelist, v_mntvnodes, nvp) { 902 if (vp->v_mount != mp) 903 goto loop; 904 905 error = func(vp, arg); 906 907 if (error != 0) 908 break; 909 } 910 911 return (error); 912 } 913 914 struct vflush_args { 915 struct vnode *skipvp; 916 int busy; 917 int flags; 918 }; 919 920 int 921 vflush_vnode(struct vnode *vp, void *arg) 922 { 923 struct vflush_args *va = arg; 924 struct proc *p = curproc; 925 int empty, s; 926 927 if (vp == va->skipvp) { 928 return (0); 929 } 930 931 if ((va->flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) { 932 return (0); 933 } 934 935 /* 936 * If WRITECLOSE is set, only flush out regular file 937 * vnodes open for writing. 938 */ 939 if ((va->flags & WRITECLOSE) && 940 (vp->v_writecount == 0 || vp->v_type != VREG)) { 941 return (0); 942 } 943 944 /* 945 * With v_usecount == 0, all we need to do is clear 946 * out the vnode data structures and we are done. 947 */ 948 if (vp->v_usecount == 0) { 949 vgonel(vp, p); 950 return (0); 951 } 952 953 /* 954 * If FORCECLOSE is set, forcibly close the vnode. 955 * For block or character devices, revert to an 956 * anonymous device. For all other files, just kill them. 957 */ 958 if (va->flags & FORCECLOSE) { 959 if (vp->v_type != VBLK && vp->v_type != VCHR) { 960 vgonel(vp, p); 961 } else { 962 vclean(vp, 0, p); 963 vp->v_op = &spec_vops; 964 insmntque(vp, NULL); 965 } 966 return (0); 967 } 968 969 /* 970 * If set, this is allowed to ignore vnodes which don't 971 * have changes pending to disk. 972 * XXX Might be nice to check per-fs "inode" flags, but 973 * generally the filesystem is sync'd already, right? 974 */ 975 s = splbio(); 976 empty = (va->flags & IGNORECLEAN) && LIST_EMPTY(&vp->v_dirtyblkhd); 977 splx(s); 978 979 if (empty) 980 return (0); 981 982 #if defined(DEBUG_SYSCTL) && (defined(DEBUG) || defined(DIAGNOSTIC)) 983 if (busyprt) 984 vprint("vflush: busy vnode", vp); 985 #endif 986 va->busy++; 987 return (0); 988 } 989 990 int 991 vflush(struct mount *mp, struct vnode *skipvp, int flags) 992 { 993 struct vflush_args va; 994 va.skipvp = skipvp; 995 va.busy = 0; 996 va.flags = flags; 997 998 vfs_mount_foreach_vnode(mp, vflush_vnode, &va); 999 1000 if (va.busy) 1001 return (EBUSY); 1002 return (0); 1003 } 1004 1005 /* 1006 * Disassociate the underlying file system from a vnode. 1007 */ 1008 void 1009 vclean(struct vnode *vp, int flags, struct proc *p) 1010 { 1011 int active, do_wakeup = 0; 1012 int s; 1013 1014 /* 1015 * Check to see if the vnode is in use. 1016 * If so we have to reference it before we clean it out 1017 * so that its count cannot fall to zero and generate a 1018 * race against ourselves to recycle it. 1019 */ 1020 if ((active = vp->v_usecount) != 0) 1021 vp->v_usecount++; 1022 1023 /* 1024 * Prevent the vnode from being recycled or 1025 * brought into use while we clean it out. 1026 */ 1027 mtx_enter(&vnode_mtx); 1028 if (vp->v_lflag & VXLOCK) 1029 panic("vclean: deadlock"); 1030 vp->v_lflag |= VXLOCK; 1031 1032 if (vp->v_lockcount > 0) { 1033 /* 1034 * Ensure that any thread currently waiting on the same lock has 1035 * observed that the vnode is about to be exclusively locked 1036 * before continuing. 1037 */ 1038 msleep_nsec(&vp->v_lockcount, &vnode_mtx, PINOD, "vop_lock", 1039 INFSLP); 1040 KASSERT(vp->v_lockcount == 0); 1041 } 1042 mtx_leave(&vnode_mtx); 1043 1044 /* 1045 * Even if the count is zero, the VOP_INACTIVE routine may still 1046 * have the object locked while it cleans it out. The VOP_LOCK 1047 * ensures that the VOP_INACTIVE routine is done with its work. 1048 * For active vnodes, it ensures that no other activity can 1049 * occur while the underlying object is being cleaned out. 1050 */ 1051 VOP_LOCK(vp, LK_EXCLUSIVE | LK_DRAIN); 1052 1053 /* 1054 * Clean out any VM data associated with the vnode. 1055 */ 1056 uvm_vnp_terminate(vp); 1057 /* 1058 * Clean out any buffers associated with the vnode. 1059 */ 1060 if (flags & DOCLOSE) 1061 vinvalbuf(vp, V_SAVE, NOCRED, p, 0, INFSLP); 1062 /* 1063 * If purging an active vnode, it must be closed and 1064 * deactivated before being reclaimed. Note that the 1065 * VOP_INACTIVE will unlock the vnode 1066 */ 1067 if (active) { 1068 if (flags & DOCLOSE) 1069 VOP_CLOSE(vp, FNONBLOCK, NOCRED, p); 1070 VOP_INACTIVE(vp, p); 1071 } else { 1072 /* 1073 * Any other processes trying to obtain this lock must first 1074 * wait for VXLOCK to clear, then call the new lock operation. 1075 */ 1076 VOP_UNLOCK(vp); 1077 } 1078 1079 /* 1080 * Reclaim the vnode. 1081 */ 1082 if (VOP_RECLAIM(vp, p)) 1083 panic("vclean: cannot reclaim"); 1084 if (active) { 1085 vp->v_usecount--; 1086 if (vp->v_usecount == 0) { 1087 s = splbio(); 1088 if (vp->v_holdcnt > 0) 1089 panic("vclean: not clean"); 1090 vputonfreelist(vp); 1091 splx(s); 1092 } 1093 } 1094 cache_purge(vp); 1095 1096 /* 1097 * Done with purge, notify sleepers of the grim news. 1098 */ 1099 vp->v_op = &dead_vops; 1100 VN_KNOTE(vp, NOTE_REVOKE); 1101 vp->v_tag = VT_NON; 1102 #ifdef VFSLCKDEBUG 1103 vp->v_flag &= ~VLOCKSWORK; 1104 #endif 1105 mtx_enter(&vnode_mtx); 1106 vp->v_lflag &= ~VXLOCK; 1107 if (vp->v_lflag & VXWANT) { 1108 vp->v_lflag &= ~VXWANT; 1109 do_wakeup = 1; 1110 } 1111 mtx_leave(&vnode_mtx); 1112 if (do_wakeup) 1113 wakeup(vp); 1114 } 1115 1116 /* 1117 * Recycle an unused vnode to the front of the free list. 1118 */ 1119 int 1120 vrecycle(struct vnode *vp, struct proc *p) 1121 { 1122 if (vp->v_usecount == 0) { 1123 vgonel(vp, p); 1124 return (1); 1125 } 1126 return (0); 1127 } 1128 1129 /* 1130 * Eliminate all activity associated with a vnode 1131 * in preparation for reuse. 1132 */ 1133 void 1134 vgone(struct vnode *vp) 1135 { 1136 struct proc *p = curproc; 1137 vgonel(vp, p); 1138 } 1139 1140 /* 1141 * vgone, with struct proc. 1142 */ 1143 void 1144 vgonel(struct vnode *vp, struct proc *p) 1145 { 1146 struct vnode *vq; 1147 struct vnode *vx; 1148 int s; 1149 1150 KASSERT(vp->v_uvcount == 0); 1151 1152 /* 1153 * If a vgone (or vclean) is already in progress, 1154 * wait until it is done and return. 1155 */ 1156 mtx_enter(&vnode_mtx); 1157 if (vp->v_lflag & VXLOCK) { 1158 vp->v_lflag |= VXWANT; 1159 msleep_nsec(vp, &vnode_mtx, PINOD, "vgone", INFSLP); 1160 mtx_leave(&vnode_mtx); 1161 return; 1162 } 1163 mtx_leave(&vnode_mtx); 1164 1165 /* 1166 * Clean out the filesystem specific data. 1167 */ 1168 vclean(vp, DOCLOSE, p); 1169 /* 1170 * Delete from old mount point vnode list, if on one. 1171 */ 1172 if (vp->v_mount != NULL) 1173 insmntque(vp, NULL); 1174 /* 1175 * If special device, remove it from special device alias list 1176 * if it is on one. 1177 */ 1178 if ((vp->v_type == VBLK || vp->v_type == VCHR) && 1179 vp->v_specinfo != NULL) { 1180 if ((vp->v_flag & VALIASED) == 0 && vp->v_type == VCHR && 1181 (cdevsw[major(vp->v_rdev)].d_flags & D_CLONE) && 1182 (minor(vp->v_rdev) >> CLONE_SHIFT == 0)) { 1183 free(vp->v_specbitmap, M_VNODE, CLONE_MAPSZ); 1184 } 1185 SLIST_REMOVE(vp->v_hashchain, vp, vnode, v_specnext); 1186 if (vp->v_flag & VALIASED) { 1187 vx = NULL; 1188 SLIST_FOREACH(vq, vp->v_hashchain, v_specnext) { 1189 if (vq->v_rdev != vp->v_rdev || 1190 vq->v_type != vp->v_type) 1191 continue; 1192 if (vx) 1193 break; 1194 vx = vq; 1195 } 1196 if (vx == NULL) 1197 panic("missing alias"); 1198 if (vq == NULL) 1199 vx->v_flag &= ~VALIASED; 1200 vp->v_flag &= ~VALIASED; 1201 } 1202 lf_purgelocks(&vp->v_speclockf); 1203 free(vp->v_specinfo, M_VNODE, sizeof(struct specinfo)); 1204 vp->v_specinfo = NULL; 1205 } 1206 /* 1207 * If it is on the freelist and not already at the head, 1208 * move it to the head of the list. 1209 */ 1210 vp->v_type = VBAD; 1211 1212 /* 1213 * Move onto the free list, unless we were called from 1214 * getnewvnode and we're not on any free list 1215 */ 1216 s = splbio(); 1217 if (vp->v_usecount == 0 && 1218 (vp->v_bioflag & VBIOONFREELIST)) { 1219 if (vp->v_holdcnt > 0) 1220 panic("vgonel: not clean"); 1221 1222 if (TAILQ_FIRST(&vnode_free_list) != vp) { 1223 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 1224 TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); 1225 } 1226 } 1227 splx(s); 1228 } 1229 1230 /* 1231 * Lookup a vnode by device number. 1232 */ 1233 int 1234 vfinddev(dev_t dev, enum vtype type, struct vnode **vpp) 1235 { 1236 struct vnode *vp; 1237 int rc =0; 1238 1239 SLIST_FOREACH(vp, &speclisth[SPECHASH(dev)], v_specnext) { 1240 if (dev != vp->v_rdev || type != vp->v_type) 1241 continue; 1242 *vpp = vp; 1243 rc = 1; 1244 break; 1245 } 1246 return (rc); 1247 } 1248 1249 /* 1250 * Revoke all the vnodes corresponding to the specified minor number 1251 * range (endpoints inclusive) of the specified major. 1252 */ 1253 void 1254 vdevgone(int maj, int minl, int minh, enum vtype type) 1255 { 1256 struct vnode *vp; 1257 int mn; 1258 1259 for (mn = minl; mn <= minh; mn++) 1260 if (vfinddev(makedev(maj, mn), type, &vp)) 1261 VOP_REVOKE(vp, REVOKEALL); 1262 } 1263 1264 /* 1265 * Calculate the total number of references to a special device. 1266 */ 1267 int 1268 vcount(struct vnode *vp) 1269 { 1270 struct vnode *vq; 1271 int count; 1272 1273 loop: 1274 if ((vp->v_flag & VALIASED) == 0) 1275 return (vp->v_usecount); 1276 count = 0; 1277 SLIST_FOREACH(vq, vp->v_hashchain, v_specnext) { 1278 if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) 1279 continue; 1280 /* 1281 * Alias, but not in use, so flush it out. 1282 */ 1283 if (vq->v_usecount == 0 && vq != vp) { 1284 vgone(vq); 1285 goto loop; 1286 } 1287 count += vq->v_usecount; 1288 } 1289 return (count); 1290 } 1291 1292 #if defined(DEBUG) || defined(DIAGNOSTIC) 1293 /* 1294 * Print out a description of a vnode. 1295 */ 1296 static char *typename[] = 1297 { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; 1298 1299 void 1300 vprint(char *label, struct vnode *vp) 1301 { 1302 char buf[64]; 1303 1304 if (label != NULL) 1305 printf("%s: ", label); 1306 printf("%p, type %s, use %u, write %u, hold %u,", 1307 vp, typename[vp->v_type], vp->v_usecount, vp->v_writecount, 1308 vp->v_holdcnt); 1309 buf[0] = '\0'; 1310 if (vp->v_flag & VROOT) 1311 strlcat(buf, "|VROOT", sizeof buf); 1312 if (vp->v_flag & VTEXT) 1313 strlcat(buf, "|VTEXT", sizeof buf); 1314 if (vp->v_flag & VSYSTEM) 1315 strlcat(buf, "|VSYSTEM", sizeof buf); 1316 if (vp->v_lflag & VXLOCK) 1317 strlcat(buf, "|VXLOCK", sizeof buf); 1318 if (vp->v_lflag & VXWANT) 1319 strlcat(buf, "|VXWANT", sizeof buf); 1320 if (vp->v_bioflag & VBIOWAIT) 1321 strlcat(buf, "|VBIOWAIT", sizeof buf); 1322 if (vp->v_bioflag & VBIOONFREELIST) 1323 strlcat(buf, "|VBIOONFREELIST", sizeof buf); 1324 if (vp->v_bioflag & VBIOONSYNCLIST) 1325 strlcat(buf, "|VBIOONSYNCLIST", sizeof buf); 1326 if (vp->v_flag & VALIASED) 1327 strlcat(buf, "|VALIASED", sizeof buf); 1328 if (buf[0] != '\0') 1329 printf(" flags (%s)", &buf[1]); 1330 if (vp->v_data == NULL) { 1331 printf("\n"); 1332 } else { 1333 printf("\n\t"); 1334 VOP_PRINT(vp); 1335 } 1336 } 1337 #endif /* DEBUG || DIAGNOSTIC */ 1338 1339 #ifdef DEBUG 1340 /* 1341 * List all of the locked vnodes in the system. 1342 * Called when debugging the kernel. 1343 */ 1344 void 1345 printlockedvnodes(void) 1346 { 1347 struct mount *mp; 1348 struct vnode *vp; 1349 1350 printf("Locked vnodes\n"); 1351 1352 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 1353 if (vfs_busy(mp, VB_READ|VB_NOWAIT)) 1354 continue; 1355 TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 1356 if (VOP_ISLOCKED(vp)) 1357 vprint(NULL, vp); 1358 } 1359 vfs_unbusy(mp); 1360 } 1361 1362 } 1363 #endif 1364 1365 /* 1366 * Top level filesystem related information gathering. 1367 */ 1368 int 1369 vfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 1370 size_t newlen, struct proc *p) 1371 { 1372 struct vfsconf *vfsp, *tmpvfsp; 1373 int ret; 1374 1375 /* all sysctl names at this level are at least name and field */ 1376 if (namelen < 2) 1377 return (ENOTDIR); /* overloaded */ 1378 1379 if (name[0] != VFS_GENERIC) { 1380 vfsp = vfs_bytypenum(name[0]); 1381 if (vfsp == NULL || vfsp->vfc_vfsops->vfs_sysctl == NULL) 1382 return (EOPNOTSUPP); 1383 1384 return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1, 1385 oldp, oldlenp, newp, newlen, p)); 1386 } 1387 1388 switch (name[1]) { 1389 case VFS_MAXTYPENUM: 1390 return (sysctl_rdint(oldp, oldlenp, newp, maxvfsconf)); 1391 1392 case VFS_CONF: 1393 if (namelen < 3) 1394 return (ENOTDIR); /* overloaded */ 1395 1396 vfsp = vfs_bytypenum(name[2]); 1397 if (vfsp == NULL) 1398 return (EOPNOTSUPP); 1399 1400 /* Make a copy, clear out kernel pointers */ 1401 tmpvfsp = malloc(sizeof(*tmpvfsp), M_TEMP, M_WAITOK|M_ZERO); 1402 memcpy(tmpvfsp, vfsp, sizeof(*tmpvfsp)); 1403 tmpvfsp->vfc_vfsops = NULL; 1404 1405 ret = sysctl_rdstruct(oldp, oldlenp, newp, tmpvfsp, 1406 sizeof(struct vfsconf)); 1407 1408 free(tmpvfsp, M_TEMP, sizeof(*tmpvfsp)); 1409 return (ret); 1410 case VFS_BCACHESTAT: /* buffer cache statistics */ 1411 ret = sysctl_rdstruct(oldp, oldlenp, newp, &bcstats, 1412 sizeof(struct bcachestats)); 1413 return(ret); 1414 } 1415 return (EOPNOTSUPP); 1416 } 1417 1418 /* 1419 * Check to see if a filesystem is mounted on a block device. 1420 */ 1421 int 1422 vfs_mountedon(struct vnode *vp) 1423 { 1424 struct vnode *vq; 1425 int error = 0; 1426 1427 if (vp->v_specmountpoint != NULL) 1428 return (EBUSY); 1429 if (vp->v_flag & VALIASED) { 1430 SLIST_FOREACH(vq, vp->v_hashchain, v_specnext) { 1431 if (vq->v_rdev != vp->v_rdev || 1432 vq->v_type != vp->v_type) 1433 continue; 1434 if (vq->v_specmountpoint != NULL) { 1435 error = EBUSY; 1436 break; 1437 } 1438 } 1439 } 1440 return (error); 1441 } 1442 1443 #ifdef NFSSERVER 1444 /* 1445 * Build hash lists of net addresses and hang them off the mount point. 1446 * Called by vfs_export() to set up the lists of export addresses. 1447 */ 1448 int 1449 vfs_hang_addrlist(struct mount *mp, struct netexport *nep, 1450 struct export_args *argp) 1451 { 1452 struct netcred *np; 1453 struct radix_node_head *rnh; 1454 int nplen, i; 1455 struct radix_node *rn; 1456 struct sockaddr *saddr, *smask = NULL; 1457 int error; 1458 1459 if (argp->ex_addrlen == 0) { 1460 if (mp->mnt_flag & MNT_DEFEXPORTED) 1461 return (EPERM); 1462 np = &nep->ne_defexported; 1463 /* fill in the kernel's ucred from userspace's xucred */ 1464 if ((error = crfromxucred(&np->netc_anon, &argp->ex_anon))) 1465 return (error); 1466 mp->mnt_flag |= MNT_DEFEXPORTED; 1467 goto finish; 1468 } 1469 if (argp->ex_addrlen > MLEN || argp->ex_masklen > MLEN || 1470 argp->ex_addrlen < 0 || argp->ex_masklen < 0) 1471 return (EINVAL); 1472 nplen = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; 1473 np = (struct netcred *)malloc(nplen, M_NETADDR, M_WAITOK|M_ZERO); 1474 np->netc_len = nplen; 1475 saddr = (struct sockaddr *)(np + 1); 1476 error = copyin(argp->ex_addr, saddr, argp->ex_addrlen); 1477 if (error) 1478 goto out; 1479 if (saddr->sa_len > argp->ex_addrlen) 1480 saddr->sa_len = argp->ex_addrlen; 1481 if (argp->ex_masklen) { 1482 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen); 1483 error = copyin(argp->ex_mask, smask, argp->ex_masklen); 1484 if (error) 1485 goto out; 1486 if (smask->sa_len > argp->ex_masklen) 1487 smask->sa_len = argp->ex_masklen; 1488 } 1489 /* fill in the kernel's ucred from userspace's xucred */ 1490 if ((error = crfromxucred(&np->netc_anon, &argp->ex_anon))) 1491 goto out; 1492 i = saddr->sa_family; 1493 switch (i) { 1494 case AF_INET: 1495 if ((rnh = nep->ne_rtable_inet) == NULL) { 1496 if (!rn_inithead((void **)&nep->ne_rtable_inet, 1497 offsetof(struct sockaddr_in, sin_addr))) { 1498 error = ENOBUFS; 1499 goto out; 1500 } 1501 rnh = nep->ne_rtable_inet; 1502 } 1503 break; 1504 default: 1505 error = EINVAL; 1506 goto out; 1507 } 1508 rn = rn_addroute(saddr, smask, rnh, np->netc_rnodes, 0); 1509 if (rn == NULL || np != (struct netcred *)rn) { /* already exists */ 1510 error = EPERM; 1511 goto out; 1512 } 1513 finish: 1514 np->netc_exflags = argp->ex_flags; 1515 return (0); 1516 out: 1517 free(np, M_NETADDR, np->netc_len); 1518 return (error); 1519 } 1520 1521 int 1522 vfs_free_netcred(struct radix_node *rn, void *w, u_int id) 1523 { 1524 struct radix_node_head *rnh = (struct radix_node_head *)w; 1525 struct netcred * np = (struct netcred *)rn; 1526 1527 rn_delete(rn->rn_key, rn->rn_mask, rnh, NULL); 1528 free(np, M_NETADDR, np->netc_len); 1529 return (0); 1530 } 1531 1532 /* 1533 * Free the net address hash lists that are hanging off the mount points. 1534 */ 1535 void 1536 vfs_free_addrlist(struct netexport *nep) 1537 { 1538 struct radix_node_head *rnh; 1539 1540 if ((rnh = nep->ne_rtable_inet) != NULL) { 1541 rn_walktree(rnh, vfs_free_netcred, rnh); 1542 free(rnh, M_RTABLE, sizeof(*rnh)); 1543 nep->ne_rtable_inet = NULL; 1544 } 1545 } 1546 #endif /* NFSSERVER */ 1547 1548 int 1549 vfs_export(struct mount *mp, struct netexport *nep, struct export_args *argp) 1550 { 1551 #ifdef NFSSERVER 1552 int error; 1553 1554 if (argp->ex_flags & MNT_DELEXPORT) { 1555 vfs_free_addrlist(nep); 1556 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 1557 } 1558 if (argp->ex_flags & MNT_EXPORTED) { 1559 if ((error = vfs_hang_addrlist(mp, nep, argp)) != 0) 1560 return (error); 1561 mp->mnt_flag |= MNT_EXPORTED; 1562 } 1563 return (0); 1564 #else 1565 return (ENOTSUP); 1566 #endif /* NFSSERVER */ 1567 } 1568 1569 struct netcred * 1570 vfs_export_lookup(struct mount *mp, struct netexport *nep, struct mbuf *nam) 1571 { 1572 #ifdef NFSSERVER 1573 struct netcred *np; 1574 struct radix_node_head *rnh; 1575 struct sockaddr *saddr; 1576 1577 np = NULL; 1578 if (mp->mnt_flag & MNT_EXPORTED) { 1579 /* 1580 * Lookup in the export list first. 1581 */ 1582 if (nam != NULL) { 1583 saddr = mtod(nam, struct sockaddr *); 1584 switch(saddr->sa_family) { 1585 case AF_INET: 1586 rnh = nep->ne_rtable_inet; 1587 break; 1588 default: 1589 rnh = NULL; 1590 break; 1591 } 1592 if (rnh != NULL) 1593 np = (struct netcred *)rn_match(saddr, rnh); 1594 } 1595 /* 1596 * If no address match, use the default if it exists. 1597 */ 1598 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED) 1599 np = &nep->ne_defexported; 1600 } 1601 return (np); 1602 #else 1603 return (NULL); 1604 #endif /* NFSSERVER */ 1605 } 1606 1607 /* 1608 * Do the usual access checking. 1609 * file_mode, uid and gid are from the vnode in question, 1610 * while acc_mode and cred are from the VOP_ACCESS parameter list 1611 */ 1612 int 1613 vaccess(enum vtype type, mode_t file_mode, uid_t uid, gid_t gid, 1614 mode_t acc_mode, struct ucred *cred) 1615 { 1616 mode_t mask; 1617 1618 /* User id 0 always gets read/write access. */ 1619 if (cred->cr_uid == 0) { 1620 /* For VEXEC, at least one of the execute bits must be set. */ 1621 if ((acc_mode & VEXEC) && type != VDIR && 1622 (file_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) 1623 return EACCES; 1624 return 0; 1625 } 1626 1627 mask = 0; 1628 1629 /* Otherwise, check the owner. */ 1630 if (cred->cr_uid == uid) { 1631 if (acc_mode & VEXEC) 1632 mask |= S_IXUSR; 1633 if (acc_mode & VREAD) 1634 mask |= S_IRUSR; 1635 if (acc_mode & VWRITE) 1636 mask |= S_IWUSR; 1637 return (file_mode & mask) == mask ? 0 : EACCES; 1638 } 1639 1640 /* Otherwise, check the groups. */ 1641 if (groupmember(gid, cred)) { 1642 if (acc_mode & VEXEC) 1643 mask |= S_IXGRP; 1644 if (acc_mode & VREAD) 1645 mask |= S_IRGRP; 1646 if (acc_mode & VWRITE) 1647 mask |= S_IWGRP; 1648 return (file_mode & mask) == mask ? 0 : EACCES; 1649 } 1650 1651 /* Otherwise, check everyone else. */ 1652 if (acc_mode & VEXEC) 1653 mask |= S_IXOTH; 1654 if (acc_mode & VREAD) 1655 mask |= S_IROTH; 1656 if (acc_mode & VWRITE) 1657 mask |= S_IWOTH; 1658 return (file_mode & mask) == mask ? 0 : EACCES; 1659 } 1660 1661 int 1662 vnoperm(struct vnode *vp) 1663 { 1664 if (vp->v_flag & VROOT || vp->v_mount == NULL) 1665 return 0; 1666 1667 return (vp->v_mount->mnt_flag & MNT_NOPERM); 1668 } 1669 1670 struct rwlock vfs_stall_lock = RWLOCK_INITIALIZER("vfs_stall"); 1671 unsigned int vfs_stalling = 0; 1672 1673 int 1674 vfs_stall(struct proc *p, int stall) 1675 { 1676 struct mount *mp; 1677 int allerror = 0, error; 1678 1679 if (stall) { 1680 atomic_inc_int(&vfs_stalling); 1681 rw_enter_write(&vfs_stall_lock); 1682 } 1683 1684 /* 1685 * The loop variable mp is protected by vfs_busy() so that it cannot 1686 * be unmounted while VFS_SYNC() sleeps. Traverse forward to keep the 1687 * lock order consistent with dounmount(). 1688 */ 1689 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 1690 if (stall) { 1691 error = vfs_busy(mp, VB_WRITE|VB_WAIT|VB_DUPOK); 1692 if (error) { 1693 printf("%s: busy\n", mp->mnt_stat.f_mntonname); 1694 allerror = error; 1695 continue; 1696 } 1697 uvm_vnp_sync(mp); 1698 error = VFS_SYNC(mp, MNT_WAIT, stall, p->p_ucred, p); 1699 if (error) { 1700 printf("%s: failed to sync\n", 1701 mp->mnt_stat.f_mntonname); 1702 vfs_unbusy(mp); 1703 allerror = error; 1704 continue; 1705 } 1706 mp->mnt_flag |= MNT_STALLED; 1707 } else { 1708 if (mp->mnt_flag & MNT_STALLED) { 1709 vfs_unbusy(mp); 1710 mp->mnt_flag &= ~MNT_STALLED; 1711 } 1712 } 1713 } 1714 1715 if (!stall) { 1716 rw_exit_write(&vfs_stall_lock); 1717 atomic_dec_int(&vfs_stalling); 1718 } 1719 1720 return (allerror); 1721 } 1722 1723 void 1724 vfs_stall_barrier(void) 1725 { 1726 if (__predict_false(vfs_stalling)) { 1727 rw_enter_read(&vfs_stall_lock); 1728 rw_exit_read(&vfs_stall_lock); 1729 } 1730 } 1731 1732 /* 1733 * Unmount all file systems. 1734 * We traverse the list in reverse order under the assumption that doing so 1735 * will avoid needing to worry about dependencies. 1736 */ 1737 void 1738 vfs_unmountall(void) 1739 { 1740 struct mount *mp, *nmp; 1741 int allerror, error, again = 1; 1742 1743 retry: 1744 allerror = 0; 1745 TAILQ_FOREACH_REVERSE_SAFE(mp, &mountlist, mntlist, mnt_list, nmp) { 1746 if (vfs_busy(mp, VB_WRITE|VB_NOWAIT)) 1747 continue; 1748 /* XXX Here is a race, the next pointer is not locked. */ 1749 if ((error = dounmount(mp, MNT_FORCE, curproc)) != 0) { 1750 printf("unmount of %s failed with error %d\n", 1751 mp->mnt_stat.f_mntonname, error); 1752 allerror = 1; 1753 } 1754 } 1755 1756 if (allerror) { 1757 printf("WARNING: some file systems would not unmount\n"); 1758 if (again) { 1759 printf("retrying\n"); 1760 again = 0; 1761 goto retry; 1762 } 1763 } 1764 } 1765 1766 /* 1767 * Sync and unmount file systems before shutting down. 1768 */ 1769 void 1770 vfs_shutdown(struct proc *p) 1771 { 1772 #ifdef ACCOUNTING 1773 acct_shutdown(); 1774 #endif 1775 1776 printf("syncing disks..."); 1777 1778 if (panicstr == NULL) { 1779 /* Sync before unmount, in case we hang on something. */ 1780 sys_sync(p, NULL, NULL); 1781 vfs_unmountall(); 1782 } 1783 1784 #if NSOFTRAID > 0 1785 sr_quiesce(); 1786 #endif 1787 1788 if (vfs_syncwait(p, 1)) 1789 printf(" giving up\n"); 1790 else 1791 printf(" done\n"); 1792 } 1793 1794 /* 1795 * perform sync() operation and wait for buffers to flush. 1796 */ 1797 int 1798 vfs_syncwait(struct proc *p, int verbose) 1799 { 1800 struct buf *bp; 1801 int iter, nbusy, dcount, s; 1802 #ifdef MULTIPROCESSOR 1803 int hold_count; 1804 #endif 1805 1806 sys_sync(p, NULL, NULL); 1807 1808 /* Wait for sync to finish. */ 1809 dcount = 10000; 1810 for (iter = 0; iter < 20; iter++) { 1811 nbusy = 0; 1812 LIST_FOREACH(bp, &bufhead, b_list) { 1813 if ((bp->b_flags & (B_BUSY|B_INVAL|B_READ)) == B_BUSY) 1814 nbusy++; 1815 /* 1816 * With soft updates, some buffers that are 1817 * written will be remarked as dirty until other 1818 * buffers are written. 1819 * 1820 * XXX here be dragons. this should really go away 1821 * but should be carefully made to go away on it's 1822 * own with testing.. XXX 1823 */ 1824 if (bp->b_flags & B_DELWRI) { 1825 s = splbio(); 1826 bremfree(bp); 1827 buf_acquire(bp); 1828 splx(s); 1829 nbusy++; 1830 bawrite(bp); 1831 if (dcount-- <= 0) { 1832 if (verbose) 1833 printf("softdep "); 1834 return 1; 1835 } 1836 } 1837 } 1838 if (nbusy == 0) 1839 break; 1840 if (verbose) 1841 printf("%d ", nbusy); 1842 #ifdef MULTIPROCESSOR 1843 if (_kernel_lock_held()) 1844 hold_count = __mp_release_all(&kernel_lock); 1845 else 1846 hold_count = 0; 1847 #endif 1848 DELAY(40000 * iter); 1849 #ifdef MULTIPROCESSOR 1850 if (hold_count) 1851 __mp_acquire_count(&kernel_lock, hold_count); 1852 #endif 1853 } 1854 1855 return nbusy; 1856 } 1857 1858 /* 1859 * posix file system related system variables. 1860 */ 1861 int 1862 fs_posix_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, 1863 void *newp, size_t newlen, struct proc *p) 1864 { 1865 /* all sysctl names at this level are terminal */ 1866 if (namelen != 1) 1867 return (ENOTDIR); 1868 1869 switch (name[0]) { 1870 case FS_POSIX_SETUID: 1871 return (sysctl_securelevel_int(oldp, oldlenp, newp, newlen, 1872 &suid_clear)); 1873 default: 1874 return (EOPNOTSUPP); 1875 } 1876 /* NOTREACHED */ 1877 } 1878 1879 /* 1880 * file system related system variables. 1881 */ 1882 int 1883 fs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 1884 size_t newlen, struct proc *p) 1885 { 1886 sysctlfn *fn; 1887 1888 switch (name[0]) { 1889 case FS_POSIX: 1890 fn = fs_posix_sysctl; 1891 break; 1892 default: 1893 return (EOPNOTSUPP); 1894 } 1895 return (*fn)(name + 1, namelen - 1, oldp, oldlenp, newp, newlen, p); 1896 } 1897 1898 1899 /* 1900 * Routines dealing with vnodes and buffers 1901 */ 1902 1903 /* 1904 * Wait for all outstanding I/Os to complete 1905 * 1906 * Manipulates v_numoutput. Must be called at splbio() 1907 */ 1908 int 1909 vwaitforio(struct vnode *vp, int slpflag, char *wmesg, uint64_t timeo) 1910 { 1911 int error = 0; 1912 1913 splassert(IPL_BIO); 1914 1915 while (vp->v_numoutput) { 1916 vp->v_bioflag |= VBIOWAIT; 1917 error = tsleep_nsec(&vp->v_numoutput, 1918 slpflag | (PRIBIO + 1), wmesg, timeo); 1919 if (error) 1920 break; 1921 } 1922 1923 return (error); 1924 } 1925 1926 /* 1927 * Update outstanding I/O count and do wakeup if requested. 1928 * 1929 * Manipulates v_numoutput. Must be called at splbio() 1930 */ 1931 void 1932 vwakeup(struct vnode *vp) 1933 { 1934 splassert(IPL_BIO); 1935 1936 if (vp != NULL) { 1937 if (vp->v_numoutput-- == 0) 1938 panic("vwakeup: neg numoutput"); 1939 if ((vp->v_bioflag & VBIOWAIT) && vp->v_numoutput == 0) { 1940 vp->v_bioflag &= ~VBIOWAIT; 1941 wakeup(&vp->v_numoutput); 1942 } 1943 } 1944 } 1945 1946 /* 1947 * Flush out and invalidate all buffers associated with a vnode. 1948 * Called with the underlying object locked. 1949 */ 1950 int 1951 vinvalbuf(struct vnode *vp, int flags, struct ucred *cred, struct proc *p, 1952 int slpflag, uint64_t slptimeo) 1953 { 1954 struct buf *bp; 1955 struct buf *nbp, *blist; 1956 int s, error; 1957 1958 #ifdef VFSLCKDEBUG 1959 if ((vp->v_flag & VLOCKSWORK) && !VOP_ISLOCKED(vp)) 1960 panic("%s: vp isn't locked, vp %p", __func__, vp); 1961 #endif 1962 1963 if (flags & V_SAVE) { 1964 s = splbio(); 1965 vwaitforio(vp, 0, "vinvalbuf", INFSLP); 1966 if (!LIST_EMPTY(&vp->v_dirtyblkhd)) { 1967 splx(s); 1968 if ((error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) != 0) 1969 return (error); 1970 s = splbio(); 1971 if (vp->v_numoutput > 0 || 1972 !LIST_EMPTY(&vp->v_dirtyblkhd)) 1973 panic("%s: dirty bufs, vp %p", __func__, vp); 1974 } 1975 splx(s); 1976 } 1977 loop: 1978 s = splbio(); 1979 for (;;) { 1980 int count = 0; 1981 if ((blist = LIST_FIRST(&vp->v_cleanblkhd)) && 1982 (flags & V_SAVEMETA)) 1983 while (blist && blist->b_lblkno < 0) 1984 blist = LIST_NEXT(blist, b_vnbufs); 1985 if (blist == NULL && 1986 (blist = LIST_FIRST(&vp->v_dirtyblkhd)) && 1987 (flags & V_SAVEMETA)) 1988 while (blist && blist->b_lblkno < 0) 1989 blist = LIST_NEXT(blist, b_vnbufs); 1990 if (!blist) 1991 break; 1992 1993 for (bp = blist; bp; bp = nbp) { 1994 nbp = LIST_NEXT(bp, b_vnbufs); 1995 if (flags & V_SAVEMETA && bp->b_lblkno < 0) 1996 continue; 1997 if (bp->b_flags & B_BUSY) { 1998 bp->b_flags |= B_WANTED; 1999 error = tsleep_nsec(bp, slpflag | (PRIBIO + 1), 2000 "vinvalbuf", slptimeo); 2001 if (error) { 2002 splx(s); 2003 return (error); 2004 } 2005 break; 2006 } 2007 bremfree(bp); 2008 /* 2009 * XXX Since there are no node locks for NFS, I believe 2010 * there is a slight chance that a delayed write will 2011 * occur while sleeping just above, so check for it. 2012 */ 2013 if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) { 2014 buf_acquire(bp); 2015 splx(s); 2016 (void) VOP_BWRITE(bp); 2017 goto loop; 2018 } 2019 buf_acquire_nomap(bp); 2020 bp->b_flags |= B_INVAL; 2021 brelse(bp); 2022 count++; 2023 /* 2024 * XXX Temporary workaround XXX 2025 * 2026 * If this is a gigantisch vnode and we are 2027 * trashing a ton of buffers, drop the lock 2028 * and yield every so often. The longer term 2029 * fix is to add a separate list for these 2030 * invalid buffers so we don't have to do the 2031 * work to free these here. 2032 */ 2033 if (count > 100) { 2034 splx(s); 2035 sched_pause(yield); 2036 goto loop; 2037 } 2038 } 2039 } 2040 if (!(flags & V_SAVEMETA) && 2041 (!LIST_EMPTY(&vp->v_dirtyblkhd) || !LIST_EMPTY(&vp->v_cleanblkhd))) 2042 panic("%s: flush failed, vp %p", __func__, vp); 2043 splx(s); 2044 return (0); 2045 } 2046 2047 void 2048 vflushbuf(struct vnode *vp, int sync) 2049 { 2050 struct buf *bp, *nbp; 2051 int s; 2052 2053 loop: 2054 s = splbio(); 2055 LIST_FOREACH_SAFE(bp, &vp->v_dirtyblkhd, b_vnbufs, nbp) { 2056 if ((bp->b_flags & B_BUSY)) 2057 continue; 2058 if ((bp->b_flags & B_DELWRI) == 0) 2059 panic("vflushbuf: not dirty"); 2060 bremfree(bp); 2061 buf_acquire(bp); 2062 splx(s); 2063 /* 2064 * Wait for I/O associated with indirect blocks to complete, 2065 * since there is no way to quickly wait for them below. 2066 */ 2067 if (bp->b_vp == vp || sync == 0) 2068 (void) bawrite(bp); 2069 else 2070 (void) bwrite(bp); 2071 goto loop; 2072 } 2073 if (sync == 0) { 2074 splx(s); 2075 return; 2076 } 2077 vwaitforio(vp, 0, "vflushbuf", INFSLP); 2078 if (!LIST_EMPTY(&vp->v_dirtyblkhd)) { 2079 splx(s); 2080 #ifdef DIAGNOSTIC 2081 vprint("vflushbuf: dirty", vp); 2082 #endif 2083 goto loop; 2084 } 2085 splx(s); 2086 } 2087 2088 /* 2089 * Associate a buffer with a vnode. 2090 * 2091 * Manipulates buffer vnode queues. Must be called at splbio(). 2092 */ 2093 void 2094 bgetvp(struct vnode *vp, struct buf *bp) 2095 { 2096 splassert(IPL_BIO); 2097 2098 2099 if (bp->b_vp) 2100 panic("bgetvp: not free"); 2101 vhold(vp); 2102 bp->b_vp = vp; 2103 if (vp->v_type == VBLK || vp->v_type == VCHR) 2104 bp->b_dev = vp->v_rdev; 2105 else 2106 bp->b_dev = NODEV; 2107 /* 2108 * Insert onto list for new vnode. 2109 */ 2110 bufinsvn(bp, &vp->v_cleanblkhd); 2111 } 2112 2113 /* 2114 * Disassociate a buffer from a vnode. 2115 * 2116 * Manipulates vnode buffer queues. Must be called at splbio(). 2117 */ 2118 void 2119 brelvp(struct buf *bp) 2120 { 2121 struct vnode *vp; 2122 2123 splassert(IPL_BIO); 2124 2125 if ((vp = bp->b_vp) == (struct vnode *) 0) 2126 panic("brelvp: NULL"); 2127 /* 2128 * Delete from old vnode list, if on one. 2129 */ 2130 if (LIST_NEXT(bp, b_vnbufs) != NOLIST) 2131 bufremvn(bp); 2132 if ((vp->v_bioflag & VBIOONSYNCLIST) && 2133 LIST_EMPTY(&vp->v_dirtyblkhd)) { 2134 vp->v_bioflag &= ~VBIOONSYNCLIST; 2135 LIST_REMOVE(vp, v_synclist); 2136 } 2137 bp->b_vp = NULL; 2138 2139 vdrop(vp); 2140 } 2141 2142 /* 2143 * Replaces the current vnode associated with the buffer, if any, 2144 * with a new vnode. 2145 * 2146 * If an output I/O is pending on the buffer, the old vnode 2147 * I/O count is adjusted. 2148 * 2149 * Ignores vnode buffer queues. Must be called at splbio(). 2150 */ 2151 void 2152 buf_replacevnode(struct buf *bp, struct vnode *newvp) 2153 { 2154 struct vnode *oldvp = bp->b_vp; 2155 2156 splassert(IPL_BIO); 2157 2158 if (oldvp) 2159 brelvp(bp); 2160 2161 if ((bp->b_flags & (B_READ | B_DONE)) == 0) { 2162 newvp->v_numoutput++; /* put it on swapdev */ 2163 vwakeup(oldvp); 2164 } 2165 2166 bgetvp(newvp, bp); 2167 bufremvn(bp); 2168 } 2169 2170 /* 2171 * Used to assign buffers to the appropriate clean or dirty list on 2172 * the vnode and to add newly dirty vnodes to the appropriate 2173 * filesystem syncer list. 2174 * 2175 * Manipulates vnode buffer queues. Must be called at splbio(). 2176 */ 2177 void 2178 reassignbuf(struct buf *bp) 2179 { 2180 struct buflists *listheadp; 2181 int delay; 2182 struct vnode *vp = bp->b_vp; 2183 2184 splassert(IPL_BIO); 2185 2186 /* 2187 * Delete from old vnode list, if on one. 2188 */ 2189 if (LIST_NEXT(bp, b_vnbufs) != NOLIST) 2190 bufremvn(bp); 2191 2192 /* 2193 * If dirty, put on list of dirty buffers; 2194 * otherwise insert onto list of clean buffers. 2195 */ 2196 if ((bp->b_flags & B_DELWRI) == 0) { 2197 listheadp = &vp->v_cleanblkhd; 2198 if ((vp->v_bioflag & VBIOONSYNCLIST) && 2199 LIST_EMPTY(&vp->v_dirtyblkhd)) { 2200 vp->v_bioflag &= ~VBIOONSYNCLIST; 2201 LIST_REMOVE(vp, v_synclist); 2202 } 2203 } else { 2204 listheadp = &vp->v_dirtyblkhd; 2205 if ((vp->v_bioflag & VBIOONSYNCLIST) == 0) { 2206 switch (vp->v_type) { 2207 case VDIR: 2208 delay = syncdelay / 2; 2209 break; 2210 case VBLK: 2211 if (vp->v_specmountpoint != NULL) { 2212 delay = syncdelay / 3; 2213 break; 2214 } 2215 /* FALLTHROUGH */ 2216 default: 2217 delay = syncdelay; 2218 } 2219 vn_syncer_add_to_worklist(vp, delay); 2220 } 2221 } 2222 bufinsvn(bp, listheadp); 2223 } 2224 2225 #ifdef DDB 2226 #include <machine/db_machdep.h> 2227 #include <ddb/db_interface.h> 2228 2229 void 2230 vfs_buf_print(void *b, int full, 2231 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2232 { 2233 struct buf *bp = b; 2234 2235 (*pr)(" vp %p lblkno 0x%llx blkno 0x%llx dev 0x%x\n" 2236 " proc %p error %d flags %lb\n", 2237 bp->b_vp, (int64_t)bp->b_lblkno, (int64_t)bp->b_blkno, bp->b_dev, 2238 bp->b_proc, bp->b_error, bp->b_flags, B_BITS); 2239 2240 (*pr)(" bufsize 0x%lx bcount 0x%lx resid 0x%lx\n" 2241 " data %p saveaddr %p iodone %p\n", 2242 bp->b_bufsize, bp->b_bcount, (long)bp->b_resid, 2243 bp->b_data, bp->b_saveaddr, 2244 bp->b_iodone); 2245 2246 (*pr)(" dirty {off 0x%x end 0x%x} valid {off 0x%x end 0x%x}\n", 2247 bp->b_dirtyoff, bp->b_dirtyend, bp->b_validoff, bp->b_validend); 2248 2249 } 2250 2251 const char *vtypes[] = { VTYPE_NAMES }; 2252 const char *vtags[] = { VTAG_NAMES }; 2253 2254 void 2255 vfs_vnode_print(void *v, int full, 2256 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2257 { 2258 struct vnode *vp = v; 2259 2260 (*pr)("tag %s(%d) type %s(%d) mount %p typedata %p\n", 2261 (u_int)vp->v_tag >= nitems(vtags)? "<unk>":vtags[vp->v_tag], 2262 vp->v_tag, 2263 (u_int)vp->v_type >= nitems(vtypes)? "<unk>":vtypes[vp->v_type], 2264 vp->v_type, vp->v_mount, vp->v_mountedhere); 2265 2266 (*pr)("data %p usecount %d writecount %d holdcnt %d numoutput %d\n", 2267 vp->v_data, vp->v_usecount, vp->v_writecount, 2268 vp->v_holdcnt, vp->v_numoutput); 2269 2270 /* uvm_object_printit(&vp->v_uobj, full, pr); */ 2271 2272 if (full) { 2273 struct buf *bp; 2274 2275 (*pr)("clean bufs:\n"); 2276 LIST_FOREACH(bp, &vp->v_cleanblkhd, b_vnbufs) { 2277 (*pr)(" bp %p\n", bp); 2278 vfs_buf_print(bp, full, pr); 2279 } 2280 2281 (*pr)("dirty bufs:\n"); 2282 LIST_FOREACH(bp, &vp->v_dirtyblkhd, b_vnbufs) { 2283 (*pr)(" bp %p\n", bp); 2284 vfs_buf_print(bp, full, pr); 2285 } 2286 } 2287 } 2288 2289 void 2290 vfs_mount_print(struct mount *mp, int full, 2291 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2292 { 2293 struct vfsconf *vfc = mp->mnt_vfc; 2294 struct vnode *vp; 2295 int cnt; 2296 2297 (*pr)("flags %b\nvnodecovered %p syncer %p data %p\n", 2298 mp->mnt_flag, MNT_BITS, 2299 mp->mnt_vnodecovered, mp->mnt_syncer, mp->mnt_data); 2300 2301 (*pr)("vfsconf: ops %p name \"%s\" num %d ref %u flags 0x%x\n", 2302 vfc->vfc_vfsops, vfc->vfc_name, vfc->vfc_typenum, 2303 vfc->vfc_refcount, vfc->vfc_flags); 2304 2305 (*pr)("statvfs cache: bsize %x iosize %x\n" 2306 "blocks %llu free %llu avail %lld\n", 2307 mp->mnt_stat.f_bsize, mp->mnt_stat.f_iosize, mp->mnt_stat.f_blocks, 2308 mp->mnt_stat.f_bfree, mp->mnt_stat.f_bavail); 2309 2310 (*pr)(" files %llu ffiles %llu favail %lld\n", mp->mnt_stat.f_files, 2311 mp->mnt_stat.f_ffree, mp->mnt_stat.f_favail); 2312 2313 (*pr)(" f_fsidx {0x%x, 0x%x} owner %u ctime 0x%llx\n", 2314 mp->mnt_stat.f_fsid.val[0], mp->mnt_stat.f_fsid.val[1], 2315 mp->mnt_stat.f_owner, mp->mnt_stat.f_ctime); 2316 2317 (*pr)(" syncwrites %llu asyncwrites = %llu\n", 2318 mp->mnt_stat.f_syncwrites, mp->mnt_stat.f_asyncwrites); 2319 2320 (*pr)(" syncreads %llu asyncreads = %llu\n", 2321 mp->mnt_stat.f_syncreads, mp->mnt_stat.f_asyncreads); 2322 2323 (*pr)(" fstype \"%s\" mnton \"%s\" mntfrom \"%s\" mntspec \"%s\"\n", 2324 mp->mnt_stat.f_fstypename, mp->mnt_stat.f_mntonname, 2325 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntfromspec); 2326 2327 (*pr)("locked vnodes:"); 2328 /* XXX would take mountlist lock, except ddb has no context */ 2329 cnt = 0; 2330 TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 2331 if (VOP_ISLOCKED(vp)) { 2332 if (cnt == 0) 2333 (*pr)("\n %p", vp); 2334 else if ((cnt % (72 / (sizeof(void *) * 2 + 4))) == 0) 2335 (*pr)(",\n %p", vp); 2336 else 2337 (*pr)(", %p", vp); 2338 cnt++; 2339 } 2340 } 2341 (*pr)("\n"); 2342 2343 if (full) { 2344 (*pr)("all vnodes:"); 2345 /* XXX would take mountlist lock, except ddb has no context */ 2346 cnt = 0; 2347 TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 2348 if (cnt == 0) 2349 (*pr)("\n %p", vp); 2350 else if ((cnt % (72 / (sizeof(void *) * 2 + 4))) == 0) 2351 (*pr)(",\n %p", vp); 2352 else 2353 (*pr)(", %p", vp); 2354 cnt++; 2355 } 2356 (*pr)("\n"); 2357 } 2358 } 2359 #endif /* DDB */ 2360 2361 void 2362 copy_statfs_info(struct statfs *sbp, const struct mount *mp) 2363 { 2364 const struct statfs *mbp; 2365 2366 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 2367 2368 if (sbp == (mbp = &mp->mnt_stat)) 2369 return; 2370 2371 sbp->f_fsid = mbp->f_fsid; 2372 sbp->f_owner = mbp->f_owner; 2373 sbp->f_flags = mbp->f_flags; 2374 sbp->f_syncwrites = mbp->f_syncwrites; 2375 sbp->f_asyncwrites = mbp->f_asyncwrites; 2376 sbp->f_syncreads = mbp->f_syncreads; 2377 sbp->f_asyncreads = mbp->f_asyncreads; 2378 sbp->f_namemax = mbp->f_namemax; 2379 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 2380 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 2381 memcpy(sbp->f_mntfromspec, mp->mnt_stat.f_mntfromspec, MNAMELEN); 2382 memcpy(&sbp->mount_info, &mp->mnt_stat.mount_info, 2383 sizeof(union mount_info)); 2384 } 2385